UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM N-CSRS CERTIFIED SHAREHOLDER REPORT OF REGISTERED MANAGEMENT INVESTMENT COMPANIES Investment Company Act file number 811-06540 Name of Fund: BlackRock MuniYield Insured Fund, Inc. Fund Address: P.O. Box 9011 Princeton, NJ 08543-9011 Name and address of agent for service: Robert C. Doll, Jr., Chief Executive Officer, BlackRock MuniYield Insured Fund, Inc., 800 Scudders Mill Road, Plainsboro, NJ 08536. Mailing address: P.O. Box 9011, Princeton, NJ 08543-9011 Registrant's telephone number, including area code: (800) 882-0052 Date of fiscal year end: 10/31/07 Date of reporting period: 11/01/06 - 04/30/07 Item 1 - Report to Stockholders ALTERNATIVES BLACKROCK SOLUTIONS EQUITIES FIXED INCOME LIQUIDITY REAL ESTATE Semi-Annual Reports BLACKROCK (Unaudited) APRIL 30, 2007 BlackRock MuniYield Fund, Inc. BlackRock MuniYield Insured Fund, Inc. BlackRock MuniYield Quality Fund, Inc. BlackRock MuniYield Quality Fund II, Inc. NOT FDIC INSURED MAY LOSE VALUE NO BANK GUARANTEE BlackRock MuniYield Fund, Inc. BlackRock MuniYield Insured Fund, Inc. BlackRock MuniYield Quality Fund, Inc. BlackRock MuniYield Quality Fund II, Inc. Quality Profiles as of April 30, 2007 Percent of BlackRock MuniYield Fund, Inc. by Total S&P/Moody's Rating Investments -------------------------------------------------------------------------------- AAA/Aaa ...................................................... 41.5% AA/Aa ........................................................ 14.3 A/A .......................................................... 9.6 BBB/Baa ...................................................... 9.3 BB/Ba ........................................................ 1.4 B/B .......................................................... 4.2 CCC/Caa ...................................................... 3.6 NR (Not Rated) ............................................... 15.8 Other* ....................................................... 0.3 -------------------------------------------------------------------------------- * Includes portfolio holdings in variable rate demand notes and short-term investments. Percent of BlackRock MuniYield Insured Fund, Inc. by Total S&P/Moody's Rating Investments -------------------------------------------------------------------------------- AAA/Aaa ...................................................... 82.2% AA/Aa ........................................................ 4.6 A/A .......................................................... 6.6 BBB/Baa ...................................................... 1.9 NR (Not Rated) ............................................... 3.5 Other* ....................................................... 1.2 -------------------------------------------------------------------------------- * Includes portfolio holdings in variable rate demand notes. -------------------------------------------------------------------------------- Percent of BlackRock MuniYield Quality Fund, Inc. by Total S&P/Moody's Rating Investments -------------------------------------------------------------------------------- AAA/Aaa ...................................................... 85.8% AA/Aa ........................................................ 5.5 A/A .......................................................... 6.3 BBB/Baa ...................................................... 0.3 NR (Not Rated) ............................................... 1.7 Other* ....................................................... 0.4 -------------------------------------------------------------------------------- * Includes portfolio holdings in short-term investments. -------------------------------------------------------------------------------- Percent of BlackRock MuniYield Quality Fund II, Inc. by Total S&P/Moody's Rating Investments -------------------------------------------------------------------------------- AAA/Aaa ...................................................... 85.6% AA/Aa ........................................................ 5.9 A/A .......................................................... 7.7 BBB/Baa ...................................................... 0.3 Other* ....................................................... 0.5 -------------------------------------------------------------------------------- * Includes portfolio holdings in short-term investments. 2 SEMI-ANNUAL REPORTS APRIL 30, 2007 A Letter to Shareholders Dear Shareholder In its first four months, 2007 could already be termed an eventful year for investors. For most financial markets, 2007 opened just as 2006 ended -- on a positive trajectory. Then, at the end of February and into March, global equity markets registered their first significant decline since last summer. The market jitters were triggered by a significant setback in the Chinese market and were exacerbated by worries of a weakening economy, escalating geopolitical concerns and rising delinquencies in the subprime mortgage market. Still, underlying stock market fundamentals appeared quite sound, supported by a generally favorable global economic backdrop, tame inflation, slowing but still positive earnings growth, relatively low interest rates and attractive valuations. These conditions prevailed later, and the Dow Jones Industrial Average crossed the 13,000 mark for the first time in its history in late April. Not unlike the equity market, the bond market also experienced volatility as observers attempted to interpret mixed economic signals. A bond market rally (falling yields and rising prices) late last year reversed itself early in 2007 amid some transitory signs of economic strength. Overall, yields have fluctuated month to month but ended April little changed from the beginning of the year. However, compared to one year ago, yields on 30-year Treasury bonds fell 36 basis points (.36%) and 10-year yields fell 44 basis points, while prices correspondingly rose. For its part, the Federal Reserve Board (the Fed) has left the target short-term interest rate on hold at 5.25% since first pausing in its interest rate-hiking campaign on August 8, 2006. The central bankers continue to express concern about potential inflationary pressures, but also acknowledge signs of economic weakness. Given this relatively "balanced" assessment, most observers believe the Fed will keep interest rates on hold for now. Against this backdrop, most major market indexes posted positive returns for the annual and semi-annual reporting periods ended April 30, 2007: Total Returns as of April 30, 2007 6-month 12-month ================================================================================================================ U.S. equities (Standard & Poor's 500 Index) + 8.60% +15.24% ---------------------------------------------------------------------------------------------------------------- Small cap U.S. equities (Russell 2000 Index) + 6.86 + 7.83 ---------------------------------------------------------------------------------------------------------------- International equities (MSCI Europe, Australasia, Far East Index) +15.46 +19.81 ---------------------------------------------------------------------------------------------------------------- Fixed income (Lehman Brothers Aggregate Bond Index) + 2.64 + 7.36 ---------------------------------------------------------------------------------------------------------------- Tax-exempt fixed income (Lehman Brothers Municipal Bond Index) + 1.59 + 5.78 ---------------------------------------------------------------------------------------------------------------- High yield bonds (Lehman Brothers U.S. Corporate High Yield 2% Issuer Cap Index) + 6.96 +11.72 ---------------------------------------------------------------------------------------------------------------- If the first four months are any guide, 2007 could be a year of enhanced market volatility. As you navigate the uncertainties, we encourage you to review your investment goals with your financial professional and to make portfolio changes, as needed. For more insight, we invite you to view "What's Ahead in 2007: An Investment Perspective" and "Are You Prepared for Volatility?" at www.blackrock.com/funds. We thank you for entrusting BlackRock with your investment assets, and we look forward to continuing to serve you in the months and years ahead. Sincerely, /s/ Robert C. Doll, Jr. Robert C. Doll, Jr. Fund President and Director SEMI-ANNUAL REPORTS APRIL 30, 2007 3 A Discussion With Your Funds' Portfolio Managers The Funds posted total returns that surpassed their respective Lipper category averages for the period, as we maintained our focus on generating yield and protecting net asset value. Describe the recent market environment relative to municipal bonds. Long-term bond yields traded in a fairly broad and volatile range over the past six months, only to end the period little changed. Overall, financial conditions have remained relatively balanced, with moderate economic activity and well-contained inflationary pressures. Recent commentary from the Federal Reserve Board (the Fed) has supported this trading range. The Fed is expected to maintain its "balanced" economic assessment at least into mid-year. During the six-month reporting period, 30-year U.S. Treasury bond yields rose nine basis points (.09%) to 4.81%, while 10-year Treasury note yields rose two basis points to 4.63%. Similarly, movements were fairly muted in the tax-exempt market. As measured by Municipal Market Data, yields on AAA-rated municipal bonds maturing in 30 years declined three basis points to 4.10%, and yields on AAA-rated municipal bonds maturing in 10 years rose 12 basis points to 3.76%. Investor demand for municipal product continued to strengthen throughout the six-month period. The Investment Company Institute reports that long-term municipal bond funds received over $8.7 billion in net new cash flows during the first three months of 2007, a 42% increase compared to the first three months of 2006. Weekly fund flows, as reported by AMG Data, also have risen. Weekly inflows during the three-month period ended April 30, 2007, averaged over $489 million, up from a weekly average of $400 million in fourth quarter 2006. The improving demand among retail investors reflects, in large part, increased acceptance of lower nominal yields and bond coupon structure. Throughout much of last year, retail-oriented municipal bond broker/dealers noted significant individual investor resistance to purchasing tax-exempt issues with yields below 4.50% and/or issues bearing nominal coupons below 5%. As tax-exempt bond yields have stabilized in recent months, it appears retail investors have become increasingly comfortable purchasing tax-exempt bonds with those characteristics, which has served to support the market's performance. In terms of supply, issuance of long-term municipal bonds has increased over the past six months. More than $225 billion in new bonds was issued during the April reporting period, an increase of over 30% compared to the same six months one year ago. Over the past three months, municipalities issued more than $106 billion in new long-term tax-exempt bonds, an increase of more than 32% compared to the same period a year ago. So far this year, greater than $135 billion in long-term municipal bonds have been underwritten, putting 2007 annual issuance some 4% ahead of 2005's record pace. Issuers have continued to take advantage of historically low interest rates to refinance outstanding issues. In the first four months of 2007, we have seen 10 underwritings exceeding $1 billion in size. These "mega-deals" have continued to be relatively easily absorbed by market participants, especially non-traditional and foreign buyers who find the liquidity afforded by these deals to be particularly attractive. Looking ahead, we believe investor demand will be critical in maintaining the tax-exempt market's strong technical position. The increase in new bond supply seen this year is unlikely to abate significantly, leading to record or near-record annual issuance. Relatively stable yield ratios compared to taxable bonds, coupled with a comparatively steep municipal yield curve, should help to sustain traditional and non-traditional investor interest in tax-exempt bonds and support the market's performance into mid-2007. 4 SEMI-ANNUAL REPORTS APRIL 30, 2007 BlackRock MuniYield Fund, Inc. How did the Fund perform during the period? For the six-month period ended April 30, 2007, the Common Stock of BlackRock MuniYield Fund, Inc. had net annualized yields of 5.53% and 5.24%, based on a period-end per share net asset value of $14.89 and a per share market price of $15.71, respectively, and $.408 per share income dividends. Over the same period, the total investment return on the Fund's Common Stock was +2.19%, based on a change in per share net asset value from $14.98 to $14.89, and assuming reinvestment of all distributions. The Fund's total return, based on net asset value, exceeded the +1.66% average return of the Lipper General Municipal Debt Funds (Leveraged) category for the six-month period. (Funds in this Lipper category invest primarily in municipal debt issues rated in the top four credit-rating categories. These funds can be leveraged via use of debt, preferred equity and/or reverse repurchase agreements.) As in prior reporting periods, Fund performance continued to be driven by our above-average dividend yield, which is largely the result of the portfolio's exposure to lower-rated, higher-yielding credits. Another significant driver of positive performance was the refunding activity that has been evident in the market for some time. A number of the Fund's holdings were refunded during the period and enjoyed subsequent increases in value. An additional benefit of the refunding activity was a boost in the overall credit profile of the portfolio as some of our lower-rated or non-rated bonds were refunded (when a bond is refunded, the risk of default essentially drops to zero and, therefore, raises the credit quality to the equivalent of a AAA-rated issue). For the most part, the Fund's interest rate exposure remained neutral during the six-month period and did not have a significant effect on performance. We did, however, employ some tactical hedging strategies in order to position the Fund a bit more defensively (that is, less interest rate exposure) late in the period. This move was in anticipation of the temporary weakness typically seen in the municipal market around the April tax deadline, when investors are focused more on allocating funds for tax payments than on buying bonds. While the "tax effect" was fairly muted this year, our hedging strategies did prove beneficial to performance for the period. On the negative side, a widening in credit spreads in the health care industry was a detractor, although the Fund's neutral exposure to that sector limited its influence on overall performance. For a description of the Fund's total investment return based on a change in the per share market value of the Fund's Common Stock (as measured by the trading price of the Fund's shares on the New York Stock Exchange), and assuming reinvestment of distributions, please refer to the Financial Highlights section of this report. As a closed-end fund, the Fund's shares may trade in the secondary market at a premium or discount to the Fund's net asset value. As a result, total investment returns based on changes in the market value of the Fund's Common Stock may vary significantly from total investment returns based on changes in the Fund's net asset value. What changes were made to the portfolio during the period? In our last report to shareholders, we noted that portfolio activity had been focused on taking advantage of further flattening in the municipal yield curve by shifting assets to the 10-year to 15-year area of the curve. During the most recent six months, we made only modest efforts to pursue this strategy as we came to believe that the yield curve will potentially maintain its flatness for an extended period of time. While we still see the greatest value in the 10-year to 15-year part of the curve, we also foresee continued strength on the long end due, in part, to high demand from traditional investors who are drawn to the positively sloped municipal curve versus other asset classes. Additionally, issuers have lately become more inclined to raise capital through structured derivative products rather than traditional bonds. Should investor demand for structured products remain strong, the supply of long-term fixed rate bonds may be reduced, which would lend further strength to the long end of the curve. Other activity during the six-month period included an effort to increase exposure to the high-grade housing and health care sectors as part of our larger goal of upgrading the overall credit profile of the portfolio. As heavy issuance occurred in both sectors, bond prices declined and we found attractive values on high-grade issues (AA or AAA). Given the persistently narrow credit spreads of these sectors and the added incentive of reduced prices on high-grade credits, we were able to increase the quality of the portfolio with less yield loss than is typically associated with a credit upgrade. SEMI-ANNUAL REPORTS APRIL 30, 2007 5 A Discussion With Your Funds' Portfolio Managers (continued) For the six-month period ended April 30, 2007, the Fund's Auction Market Preferred Stock had average yields of: 3.50% for Series A, 3.65% for Series B, 3.45% for Series C, 3.40% for Series D, 3.55% for Series E, 3.53% for Series F and 3.52% for Series G. The Fed opted to keep the target short-term interest rate on hold at 5.25% throughout the period. As such, the Fund's borrowing costs were stable, but relatively high during the period as we experienced a typical spike related to the April tax-filing deadline. The municipal yield curve, although flat by historical standards, remained positively sloped and continued to generate an income benefit to the Common Stock shareholder from the leveraging of Preferred Stock. As always, should the spread between short-term and long-term interest rates narrow, the benefits of leverage will decline and, as a result, reduce the yield on the Fund's Common Stock. (For a more complete explanation of the benefits and risks of leveraging, see page 11 of this report to shareholders.) How would you characterize the Fund's position at the close of the period? At period-end, the Fund was neutrally positioned in terms of interest rate risk, as it appears that the Fed will refrain from changing its target short-term interest rate for some time. When we see more definite signs that the economy is indeed continuing to slow to the point where the Fed is likely to lower rates, we will look to adjust the portfolio to take advantage of the falling-rate environment. We also intend to continue working on reducing the portfolio's credit exposure while maintaining the competitive income to shareholders that the Fund has consistently achieved for several years. At period-end, our borrowing costs were still elevated due to the seasonal spike associated with tax season, but we expect rates to settle back rather quickly and allow us more flexibility to pursue our credit strategies. BlackRock MuniYield Insured Fund, Inc. How did the Fund perform during the period? For the six-month period ended April 30, 2007, the Common Stock of BlackRock MuniYield Insured Fund, Inc. had net annualized yields of 4.45% and 4.73%, based on a period-end per share net asset value of $15.22 and a per share market price of $14.33, respectively, and $.336 per share income dividends. Over the same period, the total investment return on the Fund's Common Stock was +1.85%, based on a change in per share net asset value from $15.30 to $15.22, and assuming reinvestment of all distributions. The Fund's total return, based on net asset value, exceeded the +1.46% average return of the Lipper Insured Municipal Debt Funds (Leveraged) category for the six-month period. (Funds in this Lipper category invest primarily in municipal debt issues insured as to timely payment. These funds can be leveraged via use of debt, preferred equity and/or reverse repurchase agreements.) The Fund's outperformance can be attributed to our long duration relative to our peers, a posture we assumed for the majority of the period. Rates moved within a very narrow range during the period, but our slightly long bias proved favorable at times when the market rallied (that is, rates fell and prices increased). This was particularly true toward the end of 2006. For a description of the Fund's total investment return based on a change in the per share market value of the Fund's Common Stock (as measured by the trading price of the Fund's shares on the New York Stock Exchange), and assuming reinvestment of distributions, please refer to the Financial Highlights section of this report. As a closed-end fund, the Fund's shares may trade in the secondary market at a premium or discount to the Fund's net asset value. As a result, total investment returns based on changes in the market value of the Fund's Common Stock can vary significantly from total investment returns based on changes in the Fund's net asset value. 6 SEMI-ANNUAL REPORTS APRIL 30, 2007 What changes were made to the portfolio during the period? While we generally favored a long duration, we shifted to a slightly short bias in January and February in anticipation of a market decline. We refocused our efforts on increasing duration in March and April based on our belief that turmoil in the subprime mortgage market would bring yields down. Throughout the six months, we aimed to achieve additional yield for the portfolio by investing in longer-dated bonds, specifically in the 25-year to 30-year maturity range, while also seeking to protect the Fund's underlying value. In our last report to shareholders, we noted a marked narrowing of credit spreads between municipal bonds issued by high-tax states and those issued by low-tax states. In seeking to capitalize on this trend, we looked to purchase high-quality bonds issued by the high-tax states, as opposed to bonds issued by low-tax states. Because of the relatively high income taxes imposed by these states, their securities typically meet with strong retail demand, which in turn creates a solid technical market, leading to better liquidity. We maintained that bias during this period, especially with regard to California issues, in which we maintained a position of approximately 23% of net assets. Similarly, we maintained the Fund's exposure to the Pacific Northwest, where we continue to observe solid credit fundamentals. Bonds issued by the State of Washington made up approximately 10% of the portfolio. Importantly, the Fund continued to be fully invested throughout the period, consistent with our goal of maintaining an attractive level of income. For the six-month period ended April 30, 2007, the Fund's Auction Market Preferred Stock had average yields of 3.50% for Series A, 3.60% for Series B, 3.64% for Series C, 3.49% for Series D, 3.51% for Series E, 3.63% for Series F, 3.56% for Series G, 3.55% for Series H and 3.55% for Series I. The Fed kept its target interest rate unchanged during the six-month period at 5.25%. As such, the Fund's borrowing costs remained relatively stable. Importantly, the municipal yield curve maintained its positive slope, particularly compared to the Treasury curve, and continued to generate an income benefit to the Common Stock shareholder from the leveraging of Preferred Stock. As always, should the spread between short-term and long-term interest rates narrow, the benefits of leveraging will decline and, as a result, reduce the yield available to the Common Stock shareholder. (For a more complete explanation of the benefits and risks of leveraging, see page 11 of this report to shareholders.) How would you characterize the Fund's position at the close of the period? We ended the period with a fully invested portfolio and a neutral to slightly long duration relative to our peers. Municipal yields and credit spreads are near their all-time lows and the slope of the yield curve is historically very flat. However, a favorable supply/demand environment should continue to be supportive of present valuations in the municipal market. Against this backdrop, we intend to continue our efforts to enhance yield for shareholders while also protecting the Fund's underlying value. To that end, we continue to look for maturities in the 25-year to 30-year area and to favor a neutral to slightly long portfolio duration, which offers the benefit of incremental yield. We believe above-average yields can provide for competitive Fund returns over time. SEMI-ANNUAL REPORTS APRIL 30, 2007 7 A Discussion With Your Funds' Portfolio Managers (continued) BlackRock MuniYield Quality Fund, Inc. How did the Fund perform during the period? For the six-month period ended April 30, 2007, the Common Stock of BlackRock MuniYield Quality Fund, Inc. had net annualized yields of 4.53% and 4.79%, based on a period-end per share net asset value of $15.21 and a per share market price of $14.39, respectively, and $.342 per share income dividends. Over the same period, the total investment return on the Fund's Common Stock was +1.69%, based on a change in per share net asset value from $15.32 to $15.21, and assuming reinvestment of all distributions. The Fund's total return, based on net asset value, outpaced the +1.46% average return of the Lipper Insured Municipal Debt Funds (Leveraged) category for the six-month period. (Funds in this Lipper category invest primarily in municipal debt issues insured as to timely payment. These funds can be leveraged via use of debt, preferred equity and/or reverse repurchase agreements.) The Fund's positive performance is primarily attributed to two factors. First, in prior periods, we had focused on investing further out along the municipal yield curve, a strategy that continued to benefit performance as longer-dated bonds outperformed issues with shorter maturities during this period (that is, the yield curve flattened). Second, several bond holdings were advance refunded during the period, which also proved advantageous. When bonds are refunded ahead of their maturity date, they generally rise sharply in value. Finally, it is worth noting that the Fund's relatively neutral status in terms of duration (a measure of interest rate sensitivity) provided an incremental advantage versus our peers that had taken a more severe bias in terms of the direction of interest rates. Overall, interest rates were volatile but little changed over the course of the period. For a description of the Fund's total investment return based on a change in the per share market value of the Fund's Common Stock (as measured by the trading price of the Fund's shares on the New York Stock Exchange), and assuming reinvestment of dividends, please refer to the Financial Highlights section of this report. As a closed-end fund, the Fund's shares may trade in the secondary market at a premium or discount to the Fund's net asset value. As a result, total investment returns based on changes in the market value of the Fund's Common Stock can vary significantly from total investment returns based on changes in the Fund's net asset value. What changes were made to the portfolio during the period? We maintained the Fund's fully invested stance and relatively neutral posture on interest rate risk. In terms of specific portfolio activity during the period, we sold some recently advance refunded positions, as their book yields were not significantly above current market yields, and moved into higher-yielding current issues. In doing so, we focused on bonds that could be advance refunded in the future, primarily premium-coupon, high-quality bonds in the 15-year to 20-year maturity range, which would allow us to replicate the same types of trades again (that is, sell bonds with lower yields in exchange for bonds with higher yields as the curve steepens). The Fund has the ability to invest in bonds that are not insured, and we made use of that uninsured basket in an effort to enhance yield in the portfolio. Of course, "uninsured" does not necessarily mean substantially lower quality. In many cases, uninsured bonds are AAA-rated due to other types of enhancements. As such, our use of the uninsured basket did not translate into a meaningful drop in the Fund's credit quality. 8 SEMI-ANNUAL REPORTS APRIL 30, 2007 We had ample opportunity to add single-family housing bonds and health care-related issues to the portfolio given heavy issuance in the two sectors during the period. In both cases, yields were more attractive than they had been in the past couple of years. The single-family housing bonds are generally rated AA or AAA, even without insurance. In the health care sector, we primarily found opportunities in A-rated and AA-rated hospital issues. So, again, we were able to take advantage without a huge sacrifice in terms of credit quality. For the six-month period ended April 30, 2007, the Fund's Auction Market Preferred Stock had average yields of 3.67% for Series A, 3.55% for Series B, 3.53% for Series C, 3.61% for Series D and 3.55% for Series E. The Fed kept its target interest rate unchanged during the six-month period at 5.25%. As such, the Fund's borrowing costs remained relatively stable. Importantly, the municipal yield curve maintained its positive slope, particularly compared to the Treasury curve, and continued to generate an income benefit to the Common Stock shareholder from the leveraging of Preferred Stock. As always, should the spread between short-term and long-term interest rates narrow, the benefits of leveraging will decline and, as a result, reduce the yield available to the Common Stock shareholder. (For a more complete explanation of the benefits and risks of leveraging, see page 11 of this report to shareholders.) How would you characterize the Fund's position at the close of the period? The Fund ended the period in a neutral position with respect to interest rate risk. We believe this is the appropriate posture with the Fed on hold and given the historical flatness of the yield curve. We will look for a steepening of the yield curve to provide attractive investment opportunities for the portfolio. In particular, we believe the 15-year to 20-year area of the curve could offer strong relative performance in the future. The Fund was fully invested at period-end, reflecting our efforts to enhance tax-free income for our shareholders. Overall, we maintain our focus on providing shareholders with a competitive yield and preservation of net asset value within the context of a high-quality portfolio. BlackRock MuniYield Quality Fund II, Inc. How did the Fund perform during the period? For the six-month period ended April 30, 2007, the Common Stock of BlackRock MuniYield Quality Fund II, Inc. had net annualized yields of 4.46% and 4.77%, based on a period-end per share net asset value of $13.55 and a per share market price of $12.67, respectively, and $.300 per share income dividends. Over the same period, the total investment return on the Fund's Common Stock was +1.76%, based on a change in per share net asset value from $13.64 to $13.55, and assuming reinvestment of all distributions. The Fund's total return, based on net asset value, outpaced the +1.46% average return of the Lipper Insured Municipal Debt Funds (Leveraged) category for the six-month period. (Funds in this Lipper category invest primarily in municipal debt issues insured as to timely payment. These funds can be leveraged via use of debt, preferred equity and/or reverse repurchase agreements.) The Fund's positive performance is primarily attributed to two factors. First, in prior periods, we had focused on investing further out along the municipal yield curve, a strategy that continued to benefit performance as longer-dated bonds outperformed issues with shorter maturities during this period (that is, the yield curve flattened). Second, several bond holdings were advance refunded during the period, which also proved advantageous. When bonds are refunded ahead of their maturity date, they generally rise sharply in value. Finally, it is worth noting that the Fund's relatively neutral status in terms of duration (a measure of interest rate sensitivity) provided an incremental advantage versus our peers that had taken a more severe bias in terms of the direction of interest rates. Overall, interest rates were volatile but little changed over the course of the period. For a description of the Fund's total investment return based on a change in the per share market value of the Fund's Common Stock (as measured by the trading price of the Fund's shares on the New York Stock Exchange), and assuming reinvestment of distributions, please refer to the Financial Highlights section of this report. As a closed-end fund, the Fund's shares may trade in the secondary market at a premium or discount to the Fund's net asset value. As a result, total investment returns based on changes in the market value of the Fund's Common Stock can vary significantly from total investment returns based on changes in the Fund's net asset value. SEMI-ANNUAL REPORTS APRIL 30, 2007 9 A Discussion With Your Funds' Portfolio Managers (concluded) What changes were made to the portfolio during the period? We maintained the Fund's fully invested stance and relatively neutral posture on interest rate risk. In terms of specific portfolio activity during the period, we sold some recently advance refunded positions, as their book yields were not significantly above current market yields, and moved into higher-yielding current issues. In doing so, we focused on bonds that could be advance refunded in the future, primarily premium-coupon, high-quality bonds in the 15-year to 20-year maturity range, which would allow us to replicate the same types of trades again (that is, sell bonds with lower yields in exchange for bonds with higher yields as the curve steepens). The Fund has the ability to invest in bonds that are not insured, and we made use of that uninsured basket in an effort to enhance yield in the portfolio. Of course, "uninsured" does not necessarily mean substantially lower quality. In many cases, uninsured bonds are AAA-rated due to other types of enhancements. As such, our use of the uninsured basket did not translate into a meaningful drop in the Fund's credit quality. We had ample opportunity to add single-family housing bonds and health care-related issues to the portfolio given heavy issuance in the two sectors during the period. In both cases, yields were more attractive than they had been in the past couple of years. The single-family housing bonds are generally rated AA or AAA, even without insurance. In the health care sector, we primarily found opportunities in A-rated and AA-rated hospital issues. So, again, we were able to take advantage without a huge sacrifice in terms of credit quality. For the six-month period ended April 30, 2007, the Fund's Auction Market Preferred Stock had average yields of 3.64% for Series A, 3.60% for Series B, 3.55% for Series C and 3.57% for Series D. The Fed kept its target interest rate unchanged during the six-month period at 5.25%. As such, the Fund's borrowing costs remained relatively stable. Importantly, the municipal yield curve maintained its positive slope, particularly compared to the Treasury curve, and continued to generate an income benefit to the Common Stock shareholder from the leveraging of Preferred Stock. As always, should the spread between short-term and long-term interest rates narrow, the benefits of leveraging will decline and, as a result, reduce the yield available to the Common Stock shareholder. (For a more complete explanation of the benefits and risks of leveraging, see page 11 of this report to shareholders.) How would you characterize the Fund's position at the close of the period? The Fund ended the period in a neutral position with respect to interest rate risk. We believe this is the appropriate posture with the Fed on hold and given the historical flatness of the yield curve. We will look for a steepening of the yield curve to provide attractive investment opportunities for the portfolio. In particular, we believe the 15-year to 20-year area of the curve could offer strong relative performance in the future. The Fund was fully invested at period-end, reflecting our efforts to enhance tax-free income for our shareholders. Overall, we maintain our focus on providing shareholders with a competitive yield and preservation of net asset value within the context of a high-quality portfolio. Theodore R. Jaeckel Jr., CFA Vice President and Portfolio Manager BlackRock MuniYield Fund, Inc. William R. Bock Vice President and Portfolio Manager BlackRock MuniYield Insured Fund, Inc. Michael A. Kalinoski, CFA Vice President and Portfolio Manager BlackRock MuniYield Quality Fund, Inc. BlackRock MuniYield Quality Fund II, Inc. May 21, 2007 10 SEMI-ANNUAL REPORTS APRIL 30, 2007 The Benefits and Risks of Leveraging The Funds utilize leveraging to seek to enhance the yield and net asset value of their Common Stock. However, these objectives cannot be achieved in all interest rate environments. To leverage, each Fund issues Preferred Stock, which pays dividends at prevailing short-term interest rates, and invests the proceeds in long-term municipal bonds. The interest earned on these investments, net of dividends to Preferred Stock, is paid to Common Stock shareholders in the form of dividends, and the value of these portfolio holdings is reflected in the per share net asset value of each Fund's Common Stock. However, in order to benefit Common Stock shareholders, the yield curve must be positively sloped; that is, short-term interest rates must be lower than long-term interest rates. At the same time, a period of generally declining interest rates will benefit Common Stock shareholders. If either of these conditions change, then the risks of leveraging will begin to outweigh the benefits. To illustrate these concepts, assume a fund's Common Stock capitalization of $100 million and the issuance of Preferred Stock for an additional $50 million, creating a total value of $150 million available for investment in long-term municipal bonds. If prevailing short-term interest rates are approximately 3% and long-term interest rates are approximately 6%, the yield curve has a strongly positive slope. The fund pays dividends on the $50 million of Preferred Stock based on the lower short-term interest rates. At the same time, the fund's total portfolio of $150 million earns the income based on long-term interest rates. In this case, the dividends paid to Preferred Stock shareholders are significantly lower than the income earned on the fund's long-term investments, and therefore the Common Stock shareholders are the beneficiaries of the incremental yield. However, if short-term interest rates rise, narrowing the differential between short-term and long-term interest rates, the incremental yield pickup on the Common Stock will be reduced or eliminated completely. At the same time, the market value of the fund's Common Stock (that is, its price as listed on the New York Stock Exchange) may, as a result, decline. Furthermore, if long-term interest rates rise, the Common Stock's net asset value will reflect the full decline in the price of the portfolio's investments, since the value of the fund's Preferred Stock does not fluctuate. In addition to the decline in net asset value, the market value of the fund's Common Stock may also decline. As of April 30, 2007, BlackRock MuniYield Fund, Inc., BlackRock MuniYield Insured Fund, Inc., BlackRock MuniYield Quality Fund, Inc. and BlackRock MuniYield Quality Fund II, Inc. had leverage amounts, due to Auction Market Preferred Stock, of 33.85%, 35.75%, 35.07% and 34.55% of total net assets, respectively, before the deduction of Preferred Stock. As a part of their investment strategy, the Funds may invest in certain securities whose potential income return is inversely related to changes in a floating interest rate ("inverse floaters"). In general, income on inverse floaters will decrease when short-term interest rates increase and increase when short-term interest rates decrease. Investments in inverse floaters may be characterized as derivative securities and may subject the Funds to the risks of reduced or eliminated interest payments and losses of invested principal. In addition, inverse floaters have the effect of providing investment leverage and, as a result, the market value of such securities will generally be more volatile than that of fixed rate, tax-exempt securities. To the extent the Funds invest in inverse floaters, the market value of each Fund's portfolio and the net asset value of each Fund's shares may also be more volatile than if the Funds did not invest in these securities. Swap Agreements The Funds may invest in swap agreements, which are over-the-counter contracts in which one party agrees to make periodic payments based on the change in market value of a specified bond, basket of bonds, or index in return for periodic payments based on a fixed or variable interest rate or the change in market value of a different bond, basket of bonds or index. Swap agreements may be used to obtain exposure to a bond or market without owning or taking physical custody of securities. Swap agreements involve the risk that the party with whom each Fund has entered into a swap will default on its obligation to pay the Fund and the risk that the Fund will not be able to meet its obligations to pay the other party to the agreement. SEMI-ANNUAL REPORTS APRIL 30, 2007 11 Schedule of Investments as of April 30, 2007 (Unaudited) BlackRock MuniYield Fund, Inc. (in Thousands) Face Amount Municipal Bonds Value ================================================================================ Alabama -- 3.4% Birmingham, Alabama, Special Care Facilities Financing Authority, Revenue Refunding Bonds (Ascension Health Credit), Series C-2: $ 4,540 5% due 11/15/2036 $ 4,707 3,300 5% due 11/15/2039 3,413 5,250 Jefferson County, Alabama, Limited Obligation School Warrants, Series A, 5.50% due 1/01/2022 5,694 Tuscaloosa, Alabama, Special Care Facilities Financing Authority, Residential Care Facility Revenue Bonds (Capstone Village, Inc. Project), Series A: 2,200 5.625% due 8/01/2025 2,218 6,425 5.875% due 8/01/2036 6,550 ================================================================================ Arizona -- 8.9% Arizona State Transportation Board, Highway Revenue Bonds, Sub-Series A: 5,825 5% due 7/01/2021 6,188 7,030 5% due 7/01/2022 7,469 5,240 5% due 7/01/2023 5,544 3,300 Maricopa County, Arizona, IDA, Education Revenue Bonds (Arizona Charter Schools Project 1), Series A, 6.75% due 7/01/2029 3,369 Maricopa County, Arizona, IDA, M/F Housing Revenue Refunding Bonds (CRS Pine Ridge Housing Corporation), Series A-1 (e)(h): 5,000 6% due 10/20/2031 5,374 5,000 6.05% due 10/20/2036 5,335 Phoenix, Arizona, IDA, Airport Facility, Revenue Refunding Bonds (America West Airlines Inc. Project), AMT: 3,000 6.25% due 6/01/2019 3,071 5,090 6.30% due 4/01/2023 5,180 Phoenix, Arizona, IDA, M/F Housing Revenue Bonds (Summit Apartments LLC Project) (h): 1,610 6.25% due 7/20/2022 1,758 1,425 6.45% due 7/20/2032 1,555 1,305 6.55% due 7/20/2037 1,427 Pima County, Arizona, IDA, Education Revenue Refunding Bonds (Arizona Charter Schools Project II), Series A: 570 6.75% due 7/01/2011 (j) 633 830 6.75% due 7/01/2031 890 Vistancia Community Facilities District, Arizona, GO: 3,000 5.50% due 7/15/2020 3,247 2,125 5.75% due 7/15/2024 2,318 5,900 Yavapai County, Arizona, IDA, Hospital Facility Revenue Bonds (Yavapai Regional Medical Center), Series A, 6% due 8/01/2033 6,377 ================================================================================ Arkansas -- 0.7% University of Arkansas, University Construction Revenue Bonds (UAMS Campus) (i): 2,000 Series B, 5% due 11/01/2020 2,131 1,600 Series B, 5% due 11/01/2027 1,688 1,000 University of Arkansas, University Revenue Refunding Bonds (UAMS Campus), Series A, 5% due 11/01/2014 (i) 1,079 ================================================================================ California -- 15.4% California State Public Works Board, Lease Revenue Bonds: 2,000 (Department of Corrections), Series C, 5% due 6/01/2025 2,083 4,500 (Department of Mental Health -- Coalinga State Hospital), Series A, 5.125% due 6/01/2029 4,730 8,760 California State, GO, 5% due 2/01/2014 (j) 9,445 California State, Various Purpose, GO: 6,800 5.25% due 11/01/2025 7,282 10,000 5% due 4/01/2031 (a) 10,773 5,550 5.50% due 11/01/2033 6,036 Golden State Tobacco Securitization Corporation of California, Tobacco Settlement Revenue Bonds: 5,500 Series A-3, 7.875% due 6/01/2013 (j) 6,707 7,500 Series A-4, 7.80% due 6/01/2013 9,119 5,965 Golden State Tobacco Securitization Corporation of California, Tobacco Settlement Revenue Refunding Bonds, Senior Series A-1, 5.125% due 6/01/2047 5,976 25,970 Los Angeles, California, Unified School District, GO, Series A, 5% due 7/01/2013 (g)(j) 27,890 5,145 Santa Clara, California, Subordinated Electric Revenue Bonds, Series A, 5% due 7/01/2022 (i) 5,403 7,465 University of California Revenue Bonds (Multiple Purpose Projects), Series Q, 5% due 9/01/2021 (g) 7,898 ================================================================================ Portfolio Abbreviations To simplify the listings of portfolio holdings in each fund's Schedule of Investments, we have abbreviated the names of many of the securities according to the list at right. AMT Alternative Minimum Tax (subject to) COP Certificates of Participation DATES Daily Adjustable Tax-Exempt Securities DRIVERS Derivative Inverse Tax-Exempt Receipts EDA Economic Development Authority GO General Obligation Bonds HDA Housing Development Authority HFA Housing Finance Agency IDA Industrial Development Authority IDB Industrial Development Board IDR Industrial Development Revenue Bonds M/F Multi-Family PCR Pollution Control Revenue Bonds PILOT Payment in Lieu of Taxes RIB Residual Interest Bonds ROLS Reset Option Long Securities S/F Single-Family VRDN Variable Rate Demand Notes 12 SEMI-ANNUAL REPORTS APRIL 30, 2007 Schedule of Investments (continued) BlackRock MuniYield Fund, Inc. (in Thousands) Face Amount Municipal Bonds Value ================================================================================ Colorado -- 4.4% $ 3,245 Colorado Educational and Cultural Facilities Authority, Revenue Refunding Bonds (University of Denver Project), Series B, 5.25% due 3/01/2016 (d)(j) $ 3,582 280 Colorado HFA, Revenue Refunding Bonds (S/F Program), AMT, Series D-2, 6.90% due 4/01/2029 290 8,000 Denver, Colorado, City and County Airport Revenue Bonds, AMT, Series D, 7.75% due 11/15/2013 (a) 8,963 Elk Valley, Colorado, Public Improvement Revenue Bonds (Public Improvement Fee), Series A: 1,615 7.10% due 9/01/2014 1,724 5,065 7.35% due 9/01/2031 5,372 Plaza Metropolitan District Number 1, Colorado, Tax Allocation Revenue Bonds (Public Improvement Fees): 6,850 8% due 12/01/2025 7,609 1,885 8.125% due 12/01/2025 1,902 ================================================================================ Connecticut -- 0.1% 350 Connecticut State Development Authority, IDR (AFCO Cargo BDL-LLC Project), AMT, 7.35% due 4/01/2010 366 ================================================================================ Delaware -- 0.3% 2,000 New Castle County, Delaware, PCR (General Motors Corporation Project), VRDN, 7% due 10/01/2008 (n) 2,000 ================================================================================ Florida -- 6.2% 4,240 Highlands County, Florida, Health Facilities Authority, Hospital Revenue Bonds (Adventist Health System), Series C, 5.25% due 11/15/2036 4,437 Hillsborough County, Florida, IDA, Exempt Facilities Revenue Bonds (National Gypsum Company), AMT: 11,500 Series A, 7.125% due 4/01/2030 12,465 5,000 Series B, 7.125% due 4/01/2030 5,420 4,705 Lee County, Florida, Revenue Bonds, 5% due 10/01/2022 (a) 4,975 5,450 Midtown Miami, Florida, Community Development District, Special Assessment Revenue Bonds, Series B, 6.50% due 5/01/2037 6,006 1,100 Orange County, Florida, Health Facilities Authority, Health Care Revenue Refunding Bonds (Orlando Lutheran Towers), 5.375% due 7/01/2020 1,106 2,500 Orlando, Florida, Greater Orlando Aviation Authority, Airport Facilities Revenue Bonds (JetBlue Airways Corp.), AMT, 6.50% due 11/15/2036 2,666 4,620 Santa Rosa Bay Bridge Authority, Florida, Revenue Bonds, 6.25% due 7/01/2028 4,693 ================================================================================ Georgia -- 1.5% 4,600 Atlanta, Georgia, Tax Allocation Bonds (Atlantic Station Project), 7.90% due 12/01/2024 5,090 Brunswick and Glynn County, Georgia, Development Authority, First Mortgage Revenue Bonds (Coastal Community Retirement Corporation Project), Series A: 2,285 7.125% due 1/01/2025 1,840 3,595 7.25% due 1/01/2035 2,894 ================================================================================ Idaho -- 1.6% 170 Idaho Housing Agency, S/F Mortgage Revenue Refunding Bonds, AMT, Senior Series C-2, 7.15% due 7/01/2023 175 10,000 Power County, Idaho, Industrial Development Corporation, Solid Waste Disposal Revenue Bonds (FMC Corporation Project), AMT, 6.45% due 8/01/2032 10,600 ================================================================================ Illinois -- 4.2% 1,000 Bolingbrook, Illinois, Special Services Area Number 1, Special Tax Bonds (Forest City Project), 5.90% due 9/01/2007 (m) 1,036 13,200 Chicago, Illinois, O'Hare International Airport Revenue Bonds, Third Lien, AMT, Series B-2, 6% due 1/01/2029 (p) 14,780 3,915 Chicago, Illinois, O'Hare International Airport, Special Facility Revenue Refunding Bonds (American Airlines Inc. Project), 8.20% due 12/01/2024 3,966 Illinois State Finance Authority Revenue Bonds: 1,750 (Friendship Village of Schaumburg), Series A, 5.625% due 2/15/2037 1,806 2,155 (Landing At Plymouth Place Project), Series A, 6% due 5/15/2037 2,297 4,000 Metropolitan Pier and Exposition Authority, Illinois, Dedicated State Tax Revenue Bonds (McCormick Place Expansion), Series A, 5.50% due 6/15/2023 (i) 4,306 ================================================================================ Indiana -- 1.1% 2,850 Indiana Municipal Power Agency, Power Supply System Revenue Bonds, Series A, 5% due 1/01/2029 (d) 3,000 4,300 Indiana Transportation Finance Authority, Highway Revenue Bonds, Series A, 5% due 6/01/2013 (g)(j) 4,597 ================================================================================ Kansas -- 0.2% 1,250 Lenexa, Kansas, Health Care Facility Revenue Bonds (Lakeview Village Inc.), Series C, 6.875% due 5/15/2032 1,358 ================================================================================ Kentucky -- 0.5% Kentucky Economic Development Finance Authority, Health System Revenue Refunding Bonds (Norton Healthcare, Inc.), Series A: 2,350 6.625% due 10/01/2010 (j) 2,584 650 6.625% due 10/01/2028 712 ================================================================================ Louisiana -- 5.7% 6,750 Louisiana Public Facilities Authority, Hospital Revenue Bonds (Franciscan Missionaries of Our Lady Health System, Inc.), Series A, 5.25% due 8/15/2036 7,054 1,000 Louisiana Public Facilities Authority, Revenue Refunding Bonds (Pennington Medical Foundation Project), 5% due 7/01/2031 1,021 10,000 Louisiana State Citizens Property Insurance Corporation, Assessment Revenue Bonds, Series B, 5% due 6/01/2020 (a) 10,653 19,000 Port New Orleans, Louisiana, IDR, Refunding (Continental Grain Company Project), 6.50% due 1/01/2017 19,332 ================================================================================ SEMI-ANNUAL REPORTS APRIL 30, 2007 13 Schedule of Investments (continued) BlackRock MuniYield Fund, Inc. (in Thousands) Face Amount Municipal Bonds Value ================================================================================ Maryland -- 4.0% Baltimore, Maryland, Convention Center Hotel Revenue Bonds: $ 5,615 Senior Series A, 5.25% due 9/01/2039 (p) $ 6,071 1,920 Sub-Series B, 5.875% due 9/01/2039 2,048 2,580 Maryland State Community Development Administration, Department of Housing and Community Development, Residential Revenue Refunding Bonds, AMT, Series A, 4.65% due 9/01/2032 2,546 3,000 Maryland State Energy Financing Administration, Limited Obligation Revenue Bonds (Cogeneration -- AES Warrior Run), AMT, 7.40% due 9/01/2019 2,990 Maryland State Health and Higher Educational Facilities Authority, Revenue Refunding Bonds: 6,375 (Peninsula Regional Medical Center), 5% due 7/01/2036 6,559 4,000 (University of Maryland Medical System), 6% due 7/01/2032 4,314 500 Maryland State Industrial Development Financing Authority, Economic Development Revenue Bonds (Our Lady of Good Counsel School), Series A, 6% due 5/01/2035 537 1,500 Prince Georges County, Maryland, Special Obligation Bonds (National Harbor Project), 5.20% due 7/01/2034 1,536 ================================================================================ Massachusetts -- 2.8% 1,410 Massachusetts State College Building Authority, Project Revenue Bonds, Series A, 5% due 5/01/2031 (a) 1,496 3,500 Massachusetts State Development Finance Agency, Human Service Provider Revenue Bonds (Seven Hills Foundation & Affiliates), 5% due 9/01/2035 (k) 3,630 2,750 Massachusetts State Development Finance Agency, Revenue Refunding Bonds (Western New England College), Series A, 5% due 9/01/2033 (b) 2,885 10,000 Massachusetts State Special Obligation Dedicated Tax Revenue Bonds, 5.25% due 1/01/2014 (d)(j) 10,859 ================================================================================ Michigan -- 1.5% 6,060 Macomb County, Michigan, Hospital Finance Authority, Hospital Revenue Bonds (Mount Clemens General Hospital), Series B, 5.875% due 11/15/2034 6,425 1,000 Michigan State Hospital Finance Authority, Revenue Refunding Bonds (Henry Ford Health System), Series A, 5.25% due 11/15/2032 1,056 2,500 Michigan State Strategic Fund, PCR, Refunding (General Motors Corp.), 6.20% due 9/01/2020 2,562 ================================================================================ Minnesota -- 1.2% Eden Prairie, Minnesota, M/F Housing Revenue Bonds (Rolling Hills Project), Series A (h): 420 6% due 8/20/2021 458 2,000 6.20% due 2/20/2043 2,168 935 Minneapolis, Minnesota, M/F Housing Revenue Bonds (Gaar Scott Loft Project), AMT, 5.95% due 5/01/2030 971 4,500 Minnesota State Municipal Power Agency, Electric Revenue Bonds, 5% due 10/01/2030 4,682 ================================================================================ Mississippi -- 1.0% 6,405 Mississippi Business Finance Corporation Revenue Bonds (Northrop Grumman Ship System), 4.55% due 12/01/2028 6,401 ================================================================================ Missouri -- 3.7% 2,690 Fenton, Missouri, Tax Increment Revenue Refunding and Improvement Bonds (Gravois Bluffs), 7% due 10/01/2011 (j) 3,066 Missouri State Highways and Transportation Commission, First Lien State Road Revenue Bonds, Series A: 5,000 5% due 5/01/2020 5,379 15,000 5% due 5/01/2021 16,101 20 Missouri State Housing Development Commission, S/F Mortgage Revenue Bonds, Homeownership, AMT, Series B, 7.55% due 9/01/2027 (f)(h) 20 ================================================================================ Nebraska -- 0.3% Lincoln, Nebraska, Sanitation and Sewer Revenue Bonds: 865 4.25% due 6/15/2024 862 905 4.25% due 6/15/2025 900 ================================================================================ New Hampshire -- 0.6% 3,425 New Hampshire Health and Education Facilities Authority, Revenue Refunding Bonds (Elliot Hospital), Series B, 5.60% due 10/01/2022 3,634 ================================================================================ New Jersey -- 16.8% 11,435 New Jersey EDA, Cigarette Tax Revenue Bonds, 5.50% due 6/15/2024 12,033 New Jersey EDA, First Mortgage Revenue Bonds: 710 (Lions Gate Project), Series A, 5.75% due 1/01/2025 738 230 (Lions Gate Project), Series A, 5.875% due 1/01/2037 241 3,000 (The Presbyterian Home), Series A, 6.375% due 11/01/2031 3,183 20,000 New Jersey EDA, Motor Vehicle Surcharge Revenue Bonds, Series A, 5% due 7/01/2029 (i) 21,044 4,400 New Jersey EDA, Retirement Community Revenue Bonds (Cedar Crest Village Inc. Facility), Series A, 7.25% due 11/15/2011 (j) 5,051 8,825 New Jersey EDA, School Facilities Construction Revenue Bonds, Series O, 5.25% due 3/01/2023 9,554 New Jersey EDA, Special Facility Revenue Bonds (Continental Airlines Inc. Project), AMT: 3,905 6.25% due 9/15/2019 4,028 14,000 6.25% due 9/15/2029 14,468 New Jersey Health Care Facilities Financing Authority Revenue Bonds (Pascack Valley Hospital Association): 1,515 6% due 7/01/2013 1,541 1,835 6.625% due 7/01/2036 1,901 New Jersey State Transportation Trust Fund Authority, Transportation System Revenue Bonds,: 3,975 Series A, 5.50% due 12/15/2021 4,549 6,600 Series A, 5.50% due 12/15/2022 7,575 13,110 Series C, 5.05% due 12/15/2035 (a)(m) 3,698 5,425 Series D, 5% due 6/15/2019 (g) 5,796 9,410 Series D, 5% due 6/15/2020 9,943 7,000 Series D, 5% due 6/15/2020 (g) 7,456 ================================================================================ 14 SEMI-ANNUAL REPORTS APRIL 30, 2007 Schedule of Investments (continued) BlackRock MuniYield Fund, Inc. (in Thousands) Face Amount Municipal Bonds Value ================================================================================ New York -- 15.4% $ 2,200 Dutchess County, New York, IDA, Civic Facility Revenue Refunding Bonds (Saint Francis Hospital), Series A, 7.50% due 3/01/2029 $ 2,446 2,400 Erie County, New York, IDA, Revenue Bonds (Orchard Park CCRC, Inc. Project), Series A, 6% due 11/15/2026 2,558 11,000 Metropolitan Transportation Authority, New York, Transportation Revenue Refunding Bonds, Series F, 5% due 11/15/2035 11,529 New York City, New York, City IDA, PILOT Revenue Bonds (Queens Baseball Stadium Project) (a): 2,000 5% due 1/01/2022 2,149 2,175 5% due 1/01/2023 2,333 1,250 New York City, New York, City IDA, Special Facility Revenue Bonds (British Airways Plc Project), AMT, 7.625% due 12/01/2032 1,388 10,000 New York City, New York, City Municipal Water Finance Authority, Water and Sewer System, Revenue Refunding Bonds, 5.50% due 6/15/2010 (j) 10,634 New York City, New York, GO: 10,000 Series M, 5% due 4/01/2021 10,562 2,500 Series O, 5% due 6/01/2033 2,622 6,500 New York Liberty Development Corporation, Revenue Bonds (Goldman Sachs Headquarters), 5.25% due 10/01/2035 7,437 New York State Dormitory Authority, Non-State Supported Debt, Revenue Refunding Bonds: 3,145 (Mount Sinai Health), Series A, 6.75% due 7/01/2010 (j) 3,459 1,855 (Mount Sinai-NYU Medical Center Health System), Series A, 6.75% due 7/01/2020 1,996 5,000 New York State Dormitory Authority, State Personal Income Tax Revenue Bonds (Education), Series F, 5% due 3/15/2035 5,266 8,360 New York State Dormitory Authority, Supported Debt Revenue Refunding Bonds (Department of Health), Series A, 5% due 7/01/2023 (c) 8,836 2,500 Suffolk County, New York, IDA, IDR, Refunding (Nissequogue Cogeneration Partners Facility), AMT, 5.50% due 1/01/2023 2,486 9,400 Tobacco Settlement Financing Corporation of New York Revenue Bonds, Series C-1, 5.50% due 6/01/2021 10,171 10,000 Triborough Bridge and Tunnel Authority, New York, Subordinate Revenue Bonds, 5.25% due 11/15/2030 10,654 Westchester County, New York, IDA, Continuing Care Retirement, Mortgage Revenue Bonds (Kendal on Hudson Project), Series A: 3,450 6.375% due 1/01/2024 3,695 2,895 6.50% due 1/01/2034 3,106 ================================================================================ North Carolina -- 1.8% 4,750 North Carolina Eastern Municipal Power Agency, Power System Revenue Bonds, Series D, 6.75% due 1/01/2026 5,096 150 North Carolina HFA, Home Ownership Revenue Bonds, AMT, Series 8-A, 6.20% due 7/01/2016 154 1,000 North Carolina Medical Care Commission, Health Care Facilities, First Mortgage Revenue Bonds (Arbor Acres Community Project), 6.375% due 3/01/2012 (j) 1,109 5,000 North Carolina Medical Care Commission, Health Care Facilities, First Mortgage Revenue Bonds (Presbyterian Homes Project), 5.40% due 10/01/2027 5,187 675 North Carolina, HFA, S/F Revenue Bonds, Series II, 6.20% due 3/01/2016 (e) 699 ================================================================================ Ohio -- 3.1% 3,000 Cincinnati, Ohio, City School District, GO (Classroom Construction and Improvement), Refunding, 5.25% due 12/01/2020 (d) 3,390 Cuyahoga County, Ohio, Mortgage Revenue Bonds (West Tech Apartments Project), AMT (h): 141 5.75% due 9/20/2020 140 225 5.85% due 9/20/2030 223 5,065 Hamilton County, Ohio, Sewer System Improvement Revenue Bonds (The Metropolitan Sewer District of Greater Cincinnati), Series B, 5% due 12/01/2028 (i) 5,373 2,175 Lucas County, Ohio, Health Care Facility Revenue Refunding and Improvement Bonds (Sunset Retirement Communities), Series A, 6.625% due 8/15/2030 2,325 5,000 Mason, Ohio, City School District, GO (School Improvement), 5% due 6/01/2014 (g)(j) 5,382 970 Port of Greater Cincinnati Development Authority, Ohio, Special Assessment Revenue Bonds (Cooperative Public Parking Infrastructure Project), 6.30% due 2/15/2024 1,050 Toledo-Lucas County, Ohio, Port Authority Revenue Bonds (Saint Mary Woods Project), Series A: 750 6% due 5/15/2024 760 2,250 6% due 5/15/2034 2,264 ================================================================================ Oregon -- 1.4% 4,405 Oregon State Department of Administrative Services, COP, Series A, 6% due 5/01/2010 (a)(j) 4,734 2,720 Oregon State, GO, Refunding (Veterans Welfare), Series 80A, 5.70% due 10/01/2032 2,737 1,830 Portland, Oregon, Housing Authority, Housing Revenue Bonds (Pine Square and University Place), Series A, 5.875% due 1/01/2022 1,882 ================================================================================ SEMI-ANNUAL REPORTS APRIL 30, 2007 15 Schedule of Investments (continued) BlackRock MuniYield Fund, Inc. (in Thousands) Face Amount Municipal Bonds Value ================================================================================ Pennsylvania -- 4.8% $ 5,270 Pennsylvania Economic Development Financing Authority, Exempt Facilities Revenue Bonds (National Gypsum Company), AMT, Series A, 6.25% due 11/01/2027 $ 5,519 2,450 Pennsylvania HFA, S/F Mortgage Revenue Refunding Bonds, AMT, Series 97A, 4.60% due 10/01/2027 2,408 16,270 Pennsylvania State Higher Educational Facilities Authority, Health Services Revenue Refunding Bonds (Allegheny Delaware Valley Obligation), Series C, 5.875% due 11/15/2016 (i) 16,619 1,265 Philadelphia, Pennsylvania, Authority for IDR, Commercial Development, 7.75% due 12/01/2017 1,268 5,000 Sayre, Pennsylvania, Health Care Facilities Authority, Revenue Bonds (Guthrie Healthcare System), Series B, 7.125% due 12/01/2011 (j) 6,010 ================================================================================ Rhode Island -- 1.1% 4,240 Central Falls, Rhode Island, Detention Facility Corporation, Detention Facility, Revenue Refunding Bonds, 7.25% due 7/15/2035 4,765 Woonsocket, Rhode Island, GO (d): 1,225 6% due 10/01/2017 1,324 1,195 6% due 10/01/2018 1,291 ================================================================================ South Dakota -- 0.8% 5,210 South Dakota State Health and Educational Facilities Authority Revenue Bonds (Sanford Health), 5% due 11/01/2040 5,380 ================================================================================ Tennessee -- 3.9% 4,340 Hardeman County, Tennessee, Correctional Facilities Corporation Revenue Bonds, 7.75% due 8/01/2017 4,443 10,000 McMinn County, Tennessee, IDB, Solid Waste Revenue Bonds (Recycling Facility -- Calhoun Newsprint), AMT, 7.40% due 12/01/2022 10,135 11,250 Shelby County, Tennessee, Health, Educational and Housing Facility Board, Hospital Revenue Refunding Bonds (Saint Jude Children's Research Hospital), 5% due 7/01/2031 11,797 ================================================================================ Texas -- 14.9% 16,000 Alliance Airport Authority, Inc., Texas, Special Facilities Revenue Refunding Bonds (American Airlines Inc. Project), AMT, 5.75% due 12/01/2029 16,241 10,000 Austin, Texas, Convention Center Revenue Bonds (Convention Enterprises Inc.), First Tier, Series A 6.70% due 1/01/2011 (j) 10,998 Bexar County, Texas, Housing Finance Corporation, M/F Housing Revenue Bonds (Water at Northern Hills Apartments), Series A (i): 1,300 5.80% due 8/01/2021 1,322 2,460 6% due 8/01/2031 2,505 1,000 6.05% due 8/01/2036 1,019 3,755 Brazos River Authority, Texas, Revenue Refunding Bonds (Reliant Energy Inc. Project), Series B, 7.75% due 12/01/2018 3,939 5,480 Dallas-Fort Worth, Texas, International Airport Facilities Improvement Corporation Revenue Bonds (American Airlines, Inc.), AMT, 7.25% due 11/01/2030 5,487 Gregg County, Texas, Health Facilities Development Corporation, Hospital Revenue Bonds (Good Shepherd Medical Center Project) (j)(k): 2,000 6.375% due 10/01/2010 2,184 3,000 6.875% due 10/01/2010 3,323 5,000 Guadalupe-Blanco River Authority, Texas, Sewage and Solid Waste Disposal Facility Revenue Bonds (E. I. du Pont de Nemours and Company Project), AMT, 6.40% due 4/01/2026 5,058 3,900 Gulf Coast, Texas, IDA, Solid Waste Disposal Revenue Bonds (Citgo Petroleum Corporation Project), AMT, 7.50% due 5/01/2025 4,367 Houston, Texas, Airport System, Special Facilities Revenue Bonds (Continental Airlines), AMT, Series E: 3,500 7.375% due 7/01/2022 3,835 3,000 7% due 7/01/2029 3,245 1,600 Houston, Texas, Industrial Development Corporation Revenue Bonds (Air Cargo), AMT, 6.375% due 1/01/2023 1,714 Lower Colorado River Authority, Texas, PCR (Samsung Austin Semiconductor), AMT: 4,830 6.375% due 4/01/2027 4,935 3,330 6.95% due 4/01/2030 3,608 7,030 Matagorda County, Texas, Navigation District Number 1, Revenue Refunding Bonds (Reliant Energy Inc.), Series C, 8% due 5/01/2029 7,372 3,900 Port Corpus Christi, Texas, Individual Development Corporation, Environmental Facilities Revenue Bonds (Citgo Petroleum Corporation Project), AMT, 8.25% due 11/01/2031 3,987 6,500 Texas State Turnpike Authority, Central Texas Turnpike System Revenue Bonds, First Tier, Series A, 5.50% due 8/15/2039 (a) 6,973 7,020 Tyler, Texas, Waterworks and Sewer Revenue Bonds, 5.70% due 9/01/2010 (d)(j) 7,454 ================================================================================ Virginia -- 2.5% James City County, Virginia, EDA, Residential Care Facility, First Mortgage Revenue Refunding Bonds (Williamsburg Landing, Inc.), Series A: 1,500 5.35% due 9/01/2026 1,553 2,000 5.50% due 9/01/2034 2,074 Pocahontas Parkway Association, Virginia, Toll Road Revenue Bonds (j): 5,000 Senior-Series A, 5.50% due 8/15/2008 5,213 24,800 Senior-Series B, 6.67% due 8/15/2008 (m) 7,107 1,000 Winchester, Virginia, IDA, Residential Care Facilities, Revenue Bonds (Westminster-Canterbury), Series A, 5.20% due 1/01/2027 1,021 ================================================================================ Washington -- 0.3% Vancouver, Washington, Housing Authority, Housing Revenue Bonds (Teal Pointe Apartments Project), AMT: 945 6% due 9/01/2022 970 1,250 6.20% due 9/01/2032 1,283 ================================================================================ 16 SEMI-ANNUAL REPORTS APRIL 30, 2007 Schedule of Investments (concluded) BlackRock MuniYield Fund, Inc. (in Thousands) Face Amount Municipal Bonds Value =============================================================================== Wisconsin -- 1.8% $ 690 Milwaukee, Wisconsin, Revenue Bonds (Air Cargo), AMT, 6.50% due 1/01/2025 $ 743 Wisconsin Health and Educational Facilities Authority, Revenue Refunding Bonds (Eastcastle Place Inc. Project): 1,000 6% due 12/01/2024 1,034 1,800 6.125% due 12/01/2034 1,852 7,925 Wisconsin State Health and Educational Facilities Authority, Revenue Refunding Bonds (Franciscan Sisters Healthcare), 5% due 9/01/2026 8,020 700 Wisconsin State, GO, AMT, Series B, 6.20% due 11/01/2026 (i) 707 =============================================================================== Wyoming -- 1.2% 5,315 Wyoming Community Development Authority, Housing Revenue Bonds, AMT, Series 3, 4.75% due 12/01/2037 5,281 2,500 Wyoming Student Loan Corporation, Student Loan Revenue Refunding Bonds, Series A, 6.20% due 6/01/2024 2,640 =============================================================================== Puerto Rico -- 2.5% 7,755 Puerto Rico Commonwealth Highway and Transportation Authority, Transportation Revenue Refunding Bonds, Series N, 5.25% due 7/01/2034 (b) 8,956 7,100 Puerto Rico Electric Power Authority, Power Revenue Refunding Bonds, Series UU, 5% due 7/01/2023 (g) 7,663 =============================================================================== U.S. Virgin Islands -- 1.0% 6,250 Virgin Islands Public Finance Authority, Refinery Facilities Revenue Bonds (Hovensa Refinery), AMT, 6.125% due 7/01/2022 6,890 =============================================================================== Total Municipal Bonds (Cost -- $901,211) -- 142.6% 955,553 Municipal Bonds Held in Trust (o) =============================================================================== New York -- 3.2% New York City, New York, GO, Refunding, Series A (d): 10,000 6.375% due 5/15/2014 10,820 10,000 6.375% due 5/15/2015 10,820 =============================================================================== South Carolina -- 2.8% Charleston Educational Excellence Financing Corporation, South Carolina, Revenue Bonds (Charleston County School District) (b): 7,795 5.25% due 12/01/2028 8,415 6,920 5.25% due 12/01/2029 7,470 2,510 5.25% due 12/01/2030 2,708 =============================================================================== Puerto Rico -- 5.6% 30,000 Puerto Rico Commonwealth Highway and Transportation Authority, Transportation Revenue Bonds, Series B, 5.875% due 7/01/2035 (i) 32,219 5,000 Puerto Rico Electric Power Authority, Power Revenue Bonds, Series HH, 5.75% due 7/01/2010 (g)(j) 5,351 ------------------------------------------------------------------------------- Total Municipal Bonds Held in Trust (Cost -- $74,389) -- 11.6% 77,803 =============================================================================== =============================================================================== Shares Held Short-Term Securities =============================================================================== 814 Merrill Lynch Institutional Tax-Exempt Fund, 3.70% (l)(q) 814 ------------------------------------------------------------------------------- Total Short-Term Securities (Cost -- $814) -- 0.1% 814 =============================================================================== Total Investments (Cost -- $976,414*) -- 154.3% 1,034,170 Other Assets Less Liabilities -- 2.4% 15,971 Liability for Trust Certificates, Including Interest Expense Payable -- (5.5%) (36,622) Preferred Stock, at Redemption Value -- (51.2%) (343,363) ---------- Net Assets Applicable to Common Stock -- 100.0% $ 670,156 ========== * The cost and unrealized appreciation (depreciation) of investments as of April 30, 2007, as computed for federal income tax purposes, were as follows: Aggregate cost ......................................... $ 941,737 ========= Gross unrealized appreciation .......................... $ 57,719 Gross unrealized depreciation .......................... (1,399) --------- Net unrealized appreciation ............................ $ 56,320 ========= (a) AMBAC Insured. (b) Assured Guaranty Insured. (c) CIFG Insured. (d) FGIC Insured. (e) FHA Insured. (f) FNMA Collateralized. (g) FSA Insured. (h) GNMA Collateralized. (i) MBIA Insured. (j) Prerefunded. (k) Radian Insured. (l) Investments in companies considered to be an affiliate of the Fund, for purposes of Section 2(a)(3) of the Investment Company Act of 1940, were as follows: -------------------------------------------------------------------------- Net Dividend Affiliate Activity Income -------------------------------------------------------------------------- Merrill Lynch Institutional Tax-Exempt Fund (6,110) $120 -------------------------------------------------------------------------- (m) Represents a zero coupon bond; the interest rate shown reflects the effective yield at the time of purchase. (n) Security may have a maturity of more than one year at time of issuance, but has variable rate and demand features that qualify it as a short-term security. The rate disclosed is that currently in effect. This rate changes periodically based upon prevailing market rates. (o) Securities represent underlying bonds transferred to a separate securitization trust established in a tender option bond transaction in which the Fund may have acquired the residual interest certificates. These securities serve as collateral in a financing transaction. See Note 1(c) to Financial Statements for details of Municipal Bonds Held in Trust. (p) XL Capital Insured. (q) Represents the current yield as of April 30, 2007. See Notes to Financial Statements. SEMI-ANNUAL REPORTS APRIL 30, 2007 17 Schedule of Investments as of April 30, 2007 (Unaudited) BlackRock MuniYield Insured Fund, Inc. (in Thousands) Face Amount Municipal Bonds Value ================================================================================ Alaska -- 0.4% $ 3,695 Alaska Energy Authority, Power Revenue Refunding Bonds (Bradley Lake), Fourth Series, 6% due 7/01/2018 (g) $ 4,319 ================================================================================ Arizona -- 2.2% 21,355 Downtown Phoenix Hotel Corporation, Arizona, Revenue Bonds, Senior Series A, 5% due 7/01/2036 (c) 22,489 ================================================================================ California -- 32.6% 10,000 Alameda Corridor Transportation Authority, California, Capital Appreciation Revenue Refunding Bonds, Subordinate Lien, Series A, 5.40% due 10/01/2024 (a)(m) 8,274 5,000 Antioch, California, Public Finance Authority, Lease Revenue Refunding Bonds (Municipal Facilities Project), Series A, 5.50% due 1/01/2032 (b) 5,267 10,000 California Health Facilities Financing Authority Revenue Bonds (Sutter Health), Series A, 5% due 11/15/2042 10,329 10,000 California Infrastructure and Economic Development Bank, Bay Area Toll Bridges Revenue Bonds, First Lien, Series A, 5% due 7/01/2025 (c)(i) 11,213 California State Public Works Board, Lease Revenue Bonds: 5,500 (Department of Corrections), Series C, 5.25% due 6/01/2028 5,823 3,755 (Department of General Services), Series D, 5.25% due 6/01/2028 3,975 5,250 (Department of Mental Health -- Coalinga State Hospital), Series A, 5.125% due 6/01/2029 5,518 California State, GO (b): 12,260 5.50% due 4/01/2014 (f) 13,612 640 5.50% due 4/01/2030 706 20,000 California State, GO, Refunding, 4.50% due 10/01/2036 19,647 12,000 California State, Various Purpose, GO, 5.25% due 11/01/2029 12,830 32,000 California State, Various Purpose, GO, Refunding, 5% due 6/01/2034 (d) 33,596 7,740 California Statewide Communities Development Authority, Health Facility Revenue Bonds (Memorial Health Services), Series A, 6% due 10/01/2023 8,438 10,000 California Statewide Communities Development Authority Revenue Bonds (Sutter Health), Series A, 5% due 8/15/2038 (a) 10,577 4,205 California Statewide Communities Development Authority, Water Revenue Bonds (Pooled Financing Program), Series C, 5.25% due 10/01/2034 (g) 4,471 5,800 Fairfield-Suisun, California, Unified School District, GO (Election of 2002), 5.50% due 8/01/2028 (b) 6,366 13,155 Huntington Beach, California, Union High School District, GO (Election of 2004), 5% due 8/01/2029 (g) 13,857 1,000 Long Beach, California, Harbor Revenue Refunding Bonds, AMT, Series B, 5.20% due 5/15/2027 (b) 1,057 10,000 Los Angeles, California, Unified School District, GO, Series A, 5% due 7/01/2013 (b)(f) 10,739 Los Angeles, California, Water and Power Revenue Bonds (Power System) (g): 12,775 Series B, 5% due 7/01/2035 13,353 35,200 Sub-Series A-1, 5% due 7/01/2035 37,178 7,500 Modesto, California, Irrigation District, COP, Refunding and Capital Improvements, Series A, 5% due 10/01/2036 (a) 7,933 10,365 Pasadena, California, Area Community College District, GO (Election of 2002), Series B, 5% due 8/01/2031 (a) 11,027 145 Port of Oakland, California, Revenue Bonds, AMT, Series K, 5.75% due 11/01/2021 (c) 153 16,000 Riverside, California, Public Financing Authority, Tax Allocation Refunding Bonds (University Corridor/Sycamore), Series C, 5% due 8/01/2037 (b) 16,920 10,000 Riverside County, California, Public Financing Authority, Tax Allocation Revenue Bonds (Redevelopment Projects), 5% due 10/01/2035 (e) 10,440 10,000 San Francisco, California, Bay Area Rapid Transit District, Sales Tax Revenue Bonds, 5% due 7/01/2036 (g) 10,503 8,170 San Francisco, California, Community College District, GO (Election of 2001), Series C, 5% due 6/15/2029 (g) 8,699 3,250 San Mateo, California, Union High School District, COP (Phase One Projects), Series B, 4.486% due 12/15/2043 (a) 1,838 8,310 Stockton, California, Public Financing Authority, Lease Revenue Bonds (Parking & Capital Projects), 5.25% due 9/01/2034 (c) 8,879 7,785 University of California, Medical Center Pooled Revenue Bonds, Series A, 4.50% due 5/15/2037 (b) 7,785 12,000 West Valley Mission Community College District, California, GO (Election of 2004), Series A, 5% due 8/01/2030 (g) 12,776 ================================================================================ District of Columbia -- 3.6% District of Columbia, Ballpark Revenue Bonds, Series B-1 (c): 25,000 5% due 2/01/2031 26,394 10,000 5% due 2/01/2035 10,528 ================================================================================ Florida -- 3.4% 4,715 Highlands County, Florida, Health Facilities Authority, Hospital Revenue Bonds (Adventist Health System), Series C, 5.25% due 11/15/2036 4,935 1,000 Miami-Dade County, Florida, Aviation Revenue Refunding Bonds (Miami International Airport), AMT, 5.375% due 10/01/2027 (c) 1,056 12,000 Miami-Dade County, Florida, School Board, COP, Series A, 5% due 5/01/2032 (c) 12,704 2,400 Orange County, Florida, Health Facilities Authority, Hospital Revenue Bonds (Orlando Regional Healthcare), VRDN, Series A-10, 4.05% due 10/01/2041 (g)(h) 2,400 2,400 Sarasota County, Florida, Public Hospital Board, Hospital Revenue Bonds (Sarasota Memorial Hospital), VRDN, Series A, 4.10% due 7/01/2037 (a)(h) 2,400 11,000 South Broward Hospital District, Florida, Revenue Refunding Bonds, 4.75% due 5/01/2028 11,202 ================================================================================ Georgia -- 1.3% 12,500 Atlanta, Georgia, Airport General Revenue Refunding Bonds, Series B, 5.25% due 1/01/2033 (g) 13,384 ================================================================================ 18 SEMI-ANNUAL REPORTS APRIL 30, 2007 Schedule of Investments (continued) BlackRock MuniYield Insured Fund, Inc. (in Thousands) Face Amount Municipal Bonds Value ================================================================================ Hawaii -- 0.5% $ 2,000 Hawaii State, GO, Series CX, 5.50% due 2/01/2021 (g) $ 2,147 3,000 Hawaii State Harbor System Revenue Bonds, AMT, Series A, 5% due 1/01/2031 (g) 3,131 ================================================================================ Idaho -- 0.1% 1,000 Idaho Housing and Financing Association, S/F Mortgage Revenue Bonds, AMT, Series C, Class I, 4.75% due 7/01/2027 1,001 ================================================================================ Illinois -- 5.3% 15,400 Chicago, Illinois, GO, Series C, 5% due 1/01/2035 (b) 16,064 1,500 Chicago, Illinois, O'Hare International Airport, Revenue Refunding Bonds, Third Lien, AMT, Series C-2, 5.25% due 1/01/2034 (e) 1,581 5,650 Illinois State Finance Authority, Revenue Refunding Bonds (Bradley University Project), 5% due 8/01/2034 (e) 5,946 Illinois State, GO: 5,000 5% due 4/01/2028 (a) 5,281 12,000 4.75% due 4/01/2032 (c) 12,419 McLean and Woodford Counties, Illinois, Community Unit School District Number 005, GO, Refunding (g): 4,820 6.375% due 12/01/2011 (f) 5,351 1,215 6.375% due 12/01/2016 1,349 4,800 Metropolitan Pier and Exposition Authority, Illinois, Dedicated State Tax Revenue Refunding Bonds (McCormick Place Expansion Project), Series B, 5.75% due 6/15/2023 (b) 5,243 1,000 Regional Transportation Authority, Illinois, Revenue Bonds, Series C, 7.75% due 6/01/2020 (c) 1,362 ================================================================================ Indiana -- 5.3% 2,250 Indiana Health Facilities Financing Authority, Hospital Revenue Bonds (Deaconess Hospital Obligated Group), Series A, 5.375% due 3/01/2034 (a) 2,411 37,000 Indiana Transportation Finance Authority, Highway Revenue Bonds, Series A 5.25% due 6/01/2014 (c)(f) 40,377 2,705 Indianapolis, Indiana, Local Public Improvement Bond Bank, Revenue Bonds (Waterworks Project), Series A, 5.125% due 7/01/2012 (b)(f) 2,887 Indianapolis, Indiana, Local Public Improvement Bond Bank, Revenue Refunding Bonds (Indianapolis Airport Authority Project), AMT, Series B (b): 2,000 5.25% due 1/01/2028 2,138 6,525 5.25% due 1/01/2030 6,969 ================================================================================ Louisiana -- 2.0% 3,750 Louisiana Local Government Environmental Facilities and Community Development Authority, Revenue Bonds (Capital Projects and Equipment Acquisition), Series A, 6.30% due 7/01/2030 (a) 4,491 6,615 Louisiana Public Facilities Authority, Hospital Revenue Bonds (Franciscan Missionaries of Our Lady Health System, Inc.), Series A, 5.25% due 8/15/2036 6,913 4,500 Louisiana State, Gas and Fuels Tax Revenue Bonds, Series A, 5% due 5/01/2025 (e) 4,771 3,545 New Orleans, Louisiana, GO (Public Improvements), 5% due 10/01/2033 (b) 3,680 ================================================================================ Massachusetts -- 5.6% 2,500 Massachusetts State, HFA, Housing Development Revenue Refunding Bonds, Series B, 5.40% due 12/01/2028 (b) 2,563 12,805 Massachusetts State, HFA, Rental Housing Mortgage Revenue Bonds, AMT, Series A, 5.15% due 7/01/2026 (g) 13,044 7,000 Massachusetts State, HFA, S/F Housing Revenue Bonds, AMT, Series 128, 4.875% due 12/01/2038 (g) 7,040 7,550 Massachusetts State Port Authority Revenue Bonds, Series A, 5% due 7/01/2033 (b) 7,891 14,950 Massachusetts State School Building Authority, Dedicated Sales Tax Revenue Bonds, Series A, 5% due 8/15/2037 (a) 15,940 10,000 Massachusetts State Special Obligation Dedicated Tax Revenue Bonds, 5.75% due 1/01/2014 (c)(f) 11,151 ================================================================================ Michigan -- 4.8% 12,000 Eastern Michigan University Revenue Refunding Bonds, VRDN, 4.06% due 6/01/2027 (c)(h) 12,000 4,325 Michigan Higher Education Student Loan Authority, Student Loan Revenue Bonds, AMT, Series XVII-Q, 5% due 3/01/2031 (a) 4,488 Michigan State Hospital Finance Authority, Hospital Revenue Refunding Bonds: 4,000 (Oakwood Obligated Group), Series A, 5% due 7/15/2025 4,132 6,665 (Sparrow Obligated Group), 5% due 11/15/2036 6,857 20,000 Wayne County, Michigan, Airport Authority Revenue Bonds (Detroit Metropolitan Wayne County Airport), AMT, 5% due 12/01/2029 (b) 20,893 ================================================================================ Mississippi -- 1.0% 10,000 Mississippi Hospital Equipment and Facilities Authority, Revenue Refunding Bonds (Mississippi Baptist Health System, Inc.), Series A, 5% due 8/15/2029 10,308 ================================================================================ Missouri -- 2.2% Missouri Joint Municipal Electric Utility Commission, Power Project Revenue Bonds (Latan 2 Project), Series A (a): 7,930 5% due 1/01/2027 8,416 8,325 5% due 1/01/2028 8,823 140 Missouri State Housing Development Commission, S/F Mortgage Revenue Bonds (Homeownership Loan Program), AMT, Series C-1, 7.15% due 3/01/2032 (k) 149 5,000 Missouri State Housing Development Commission, S/F Mortgage Revenue Refunding Bonds (Homeownership Loan Program), AMT, Series D-1, 5% due 9/01/2037 (k)(l) 5,085 ================================================================================ Montana -- 0.5% 5,505 Montana State Board of Housing, S/F Mortgage Revenue Refunding Bonds, AMT, Series A-2, 4.80% due 12/01/2037 5,509 ================================================================================ Nebraska -- 4.5% 1,600 Nebraska Educational Financing Authority Revenue Bonds (Creighton University Project), VRDN, Series C, 4.10% due 7/01/2035 (c)(h) 1,600 15,435 Nebraska Public Power District Revenue Bonds, Series A, 5% due 1/01/2035 (a) 16,133 6,780 Omaha Convention Hotel Corporation, Nebraska, Convention Center Revenue Bonds, First Tier, Series A, 5.125% due 4/01/2032 (a) 7,086 SEMI-ANNUAL REPORTS APRIL 30, 2007 19 Schedule of Investments (continued) BlackRock MuniYield Insured Fund, Inc. (in Thousands) Face Amount Municipal Bonds Value ================================================================================ Nebraska (concluded) Public Power Generation Agency, Nebraska, Revenue Bonds (Whelan Energy Center Unit 2), Series A (a): $10,000 5% due 1/01/2032 $ 10,597 10,000 5% due 1/01/2037 10,573 ================================================================================ Nevada -- 5.2% 25,000 Clark County, Nevada, Airport System Subordinate Lien Revenue Bonds, Series A-2, 5% due 7/01/2030 (c) 26,131 6,000 Henderson, Nevada, Health Care Facilities Revenue Bonds (Catholic Healthcare West), Series A, 5.625% due 7/01/2024 6,409 1,165 Reno, Nevada, Capital Improvement Revenue Bonds, 5.50% due 6/01/2019 (c) 1,252 20,000 Truckee Meadows, Nevada, Water Authority, Water Revenue Refunding Bonds, 4.50% due 7/01/2030 (g) 19,999 ================================================================================ New Hampshire -- 1.0% 10,000 New Hampshire State Business Finance Authority, PCR, Refunding (Public Service Company Project), AMT, Series B, 4.75% due 5/01/2021 (b) 10,216 ================================================================================ New Jersey -- 5.3% 16,000 Garden State Preservation Trust of New Jersey, Open Space and Farmland Preservation Revenue Bonds, Series A, 5.75% due 11/01/2028 (g) 19,515 New Jersey EDA, Cigarette Tax Revenue Bonds: 3,060 5.75% due 6/15/2029 3,311 2,610 5.50% due 6/15/2031 2,770 14,135 5.75% due 6/15/2034 15,213 New Jersey State Transportation Trust Fund Authority, Transportation System Revenue Bonds, Series C (a)(m): 20,000 4.96% due 12/15/2035 5,642 20,000 5.03% due 12/15/2036 5,383 2,880 Newark, New Jersey, Housing Authority, Port Authority -- Port Newark Marine Terminal Additional Rent-Backed Revenue Bonds (City of Newark Redevelopment Projects), 5.50% due 1/01/2014 (b)(f) 3,173 ================================================================================ New Mexico -- 0.2% 1,605 New Mexico Educational Assistance Foundation, Student Loan Revenue Refunding Bonds (Student Loan Program), AMT, First Sub-Series A-2, 6.65% due 11/01/2025 1,635 410 New Mexico Mortgage Finance Authority, S/F Mortgage Revenue Bonds, AMT, Series C-2, 6.95% due 9/01/2031 (k) 415 ================================================================================ New York -- 13.2% 10,250 Long Island Power Authority, New York, Electric System Revenue Bonds, Series A, 5.10% due 9/01/2029 10,811 12,500 Metropolitan Transportation Authority, New York, Commuter Facilities Revenue Refunding Bonds, Series B, 5.125% due 7/01/2024 (a)(i) 12,778 30,000 New York City, New York, City Municipal Water Finance Authority, Water and Sewer System, Revenue Refunding Bonds, Series B, 5% due 6/15/2036 (g) 31,551 New York City, New York, GO: 1,880 Series B, 5.875% due 8/01/2016 (b) 2,019 10,000 Series J, 5.25% due 5/15/2024 10,697 1,000 Series J, 5.25% due 5/15/2025 1,069 New York City, New York, GO: (concluded) 20,000 Series M, 5% due 4/01/2030 (n) 21,095 6,000 Sub-Series C-1, 5.25% due 8/15/2026 6,427 6,645 New York State Urban Development Corporation, Personal Income Tax Revenue Bonds, Series B, 5% due 3/15/2030 (g) 7,016 19,500 Port Authority of New York and New Jersey, Consolidated Revenue Bonds, AMT, 137th Series, 5.125% due 7/15/2030 (g) 20,629 10,900 Syracuse, New York, IDA, PILOT Revenue Bonds (Carousel Center Project), AMT, Series A, 5% due 1/01/2036 (e) 11,384 ================================================================================ Ohio -- 0.5% 5,000 Cleveland State University, Ohio, General Receipt Revenue Bonds, Series A, 4.50% due 6/01/2036 (c) 4,992 ================================================================================ Pennsylvania -- 4.1% 15,000 Philadelphia, Pennsylvania, Gas Works Revenue Refunding Bonds, 1998 General Ordinance, 7th Series, 5% due 10/01/2037 (a) 15,835 Philadelphia, Pennsylvania, School District, GO, Series D (c)(f): 12,115 5.125% due 6/01/2014 13,135 6,000 5.25% due 6/01/2014 6,551 5,000 Sayre, Pennsylvania, Health Care Facilities Authority, Revenue Bonds (Guthrie Healthcare System), Series B, 7.125% due 12/01/2011 (f) 6,010 ================================================================================ South Carolina -- 4.1% 5,000 Berkeley County, South Carolina, School District, Installment Lease Revenue Bonds (Securing Assets for Education Project), 5.125% due 12/01/2030 5,297 Charleston Educational Excellence Financing Corporation, South Carolina, Revenue Bonds (Charleston County School District) (n): 3,895 5.25% due 12/01/2028 4,205 3,465 5.25% due 12/01/2029 3,740 1,160 5.25% due 12/01/2030 1,251 Kershaw County, South Carolina, Public Schools Foundation, Installment Power Revenue Refunding Bonds (d): 3,775 5% due 12/01/2030 3,972 3,690 5% due 12/01/2031 3,882 1,000 South Carolina Housing Finance and Development Authority, Mortgage Revenue Refunding Bonds, AMT, Series A-2, 6.35% due 7/01/2019 (g) 1,035 18,030 South Carolina Transportation Infrastructure Bank Revenue Bonds, Series A, 5% due 10/01/2029 (a) 18,793 ================================================================================ Tennessee -- 5.1% 9,000 Knox County, Tennessee, Health, Educational and Housing Facilities Board, Revenue Refunding Bonds (University Health System Inc.), 5.25% due 4/01/2027 9,367 30,000 Tennessee Energy Acquisition Corporation, Gas Revenue Bonds, Series A, 5.25% due 9/01/2026 33,296 Tennessee HDA, Revenue Bonds (Homeownership Program), AMT, Series 2C: 1,795 6.05% due 7/01/2012 1,839 2,250 6.15% due 7/01/2014 2,290 20 SEMI-ANNUAL REPORTS APRIL 30, 2007 Schedule of Investments (continued) BlackRock MuniYield Insured Fund, Inc. (in Thousands) Face Amount Municipal Bonds Value ================================================================================ Tennessee (concluded) Tennessee HDA, Revenue Refunding Bonds (Homeownership Program), AMT, Series A (g): $ 3,110 5.25% due 7/01/2022 $ 3,198 2,205 5.35% due 1/01/2026 2,264 ================================================================================ Texas -- 8.4% 1,880 Bexar, Texas, Metropolitan Water District, Waterworks System Revenue Refunding Bonds, 6.35% due 5/01/2025 (b) 1,884 1,000 Dallas-Fort Worth, Texas, International Airport, Joint Revenue Bonds, AMT, Series A, 5% due 11/01/2035 (g) 1,008 Harris County-Houston Sports Authority, Texas, Revenue Refunding Bonds, Senior Lien, Series G (b): 1,665 5.75% due 11/15/2019 1,790 3,500 5.75% due 11/15/2020 3,763 10,000 5.25% due 11/15/2030 10,531 2,900 Harris County, Texas, Health Facilities Development Corporation, Hospital Revenue Bonds (Texas Children's Hospital), VRDN, Series B-1, 4.11% due 10/01/2029 (b)(h) 2,900 15,000 North Texas Municipal Water District, Texas, Water System Revenue Bonds, 5% due 9/01/2031 (b) 15,894 5,890 North Texas Thruway Authority, Dallas North Thruway System Revenue Bonds, Series A, 5% due 1/01/2035 (g) 6,164 4,825 Texas State Department of Housing and Community Affairs, S/F Mortgage Revenue Bonds, AMT, Series A, 5.45% due 9/01/2023 (b)(k) 4,985 10,000 Texas State Turnpike Authority, Central Texas Turnpike System Revenue Bonds, First Tier, Series A, 5.50% due 8/15/2039 (a) 10,728 24,500 Waco, Texas, Health Facilities Development Corporation, Mortgage Revenue Bonds (Hillcrest Health System Projects), Series A, 5% due 8/01/2031 (b)(p) 25,606 ================================================================================ Vermont -- 0.6% Vermont HFA, S/F Housing Revenue Bonds, AMT (g): 515 Series 12B, 6.30% due 11/01/2019 515 6,000 Series 27, 4.85% due 11/01/2032 6,050 ================================================================================ Virginia -- 1.1% 2,500 Halifax County, Virginia, IDA, Exempt Facility Revenue Refunding Bonds (Old Dominion Electric Cooperative Project), AMT, 5.625% due 6/01/2028 (a) 2,727 7,695 Virginia Port Authority, Port Facilities Revenue Bonds, AMT, 5% due 7/01/2036 (c) 7,979 ================================================================================ Washington -- 13.3% Bellevue, Washington, GO, Refunding (b): 2,545 5.25% due 12/01/2026 2,751 2,455 5.25% due 12/01/2027 2,639 2,850 5.25% due 12/01/2028 3,064 3,000 5.25% due 12/01/2029 3,225 17,600 5% due 12/01/2034 18,459 3,030 Chelan County, Washington, Public Utility District Number 001, Consolidated Revenue Bonds (Chelan Hydro System), AMT, Series A, 5.45% due 7/01/2037 (a) 3,211 Chelan County, Washington, Public Utility District Number 001, Consolidated Revenue Refunding Bonds (Chelan Hydro System), AMT (b): 6,595 Series B, 6.35% due 7/01/2026 6,752 6,000 Series C, 5.65% due 7/01/2032 6,405 10,000 King County, Washington, School District Number 401 (Highline), GO, 5.25% due 12/01/2025 (g) 10,904 10,000 Radford Court Properties, Washington, Student Housing Revenue Bonds, 5.75% due 6/01/2032 (b) 10,636 1,720 Seattle, Washington, Drain and Wastewater Utility Revenue Bonds, 5.75% due 11/01/2009 (b)(f) 1,820 Skagit County, Washington, Public Hospital District, GO, Series A (b): 4,944 5.25% due 12/01/2025 5,312 5,450 5.25% due 12/01/2026 5,859 5,300 Tacoma, Washington, Regional Water Supply System, Water Revenue Bonds, 5% due 12/01/2032 (b) 5,504 7,250 Tacoma, Washington, Solid Waste Utility Revenue Refunding Bonds, Series B, 5.50% due 12/01/2007 (a)(f) 7,395 21,365 Washington State, GO, Series D, 5% due 1/01/2029 (c) 22,746 7,000 Washington State Health Care Facilities Authority Revenue Bonds (Providence Health System), Series A, 5.25% due 10/01/2021 (b) 7,325 12,035 Washington State, Motor Vehicle Fuel Tax, GO, Series B, 5% due 7/01/2031 (g) 12,770 ================================================================================ West Virginia -- 0.6% 5,925 Harrison County, West Virginia, County Commission for Solid Waste Disposal Revenue Bonds (Monongahela Power), AMT, Series C, 6.75% due 8/01/2024 (a) 5,939 ================================================================================ Wisconsin -- 0.4% 3,395 Wisconsin State Health and Educational Facilities Authority Revenue Bonds (SynergyHealth Inc.), 6% due 11/15/2032 3,692 -------------------------------------------------------------------------------- Total Municipal Bonds (Cost -- $1,360,156) -- 138.4% 1,417,804 ================================================================================ ================================================================================ Municipal Bonds Held in Trust (j) ================================================================================ California -- 5.1% 14,900 California State, Various Purpose, GO, 5.50% due 11/01/2033 (b) 16,178 10,030 Gavilan, California, Joint Community College District, GO (Election of 2004), Series A, 5.50% due 8/01/2028 (a) 11,008 14,000 Port of Oakland, California, Revenue Bonds, AMT, Series K, 5.75% due 11/01/2021 (c) 14,731 9,460 Port of Oakland, California, Revenue Refunding Bonds, AMT, Series L, 5.375% due 11/01/2027 (c) 10,044 ================================================================================ Florida -- 1.1% 10,750 Miami-Dade County, Florida, Aviation Revenue Refunding Bonds (Miami International Airport), AMT, 5.375% due 10/01/2025 (c) 11,345 ================================================================================ Georgia -- 2.7% 26,500 Atlanta, Georgia, Airport General Revenue Refunding Bonds, AMT, Series A, 5.125% due 1/01/2030 (g) 27,717 ================================================================================ SEMI-ANNUAL REPORTS APRIL 30, 2007 21 Schedule of Investments (continued) BlackRock MuniYield Insured Fund, Inc. (in Thousands) Face Amount Municipal Bonds Held in Trust (j) Value =============================================================================== Illinois -- 8.1% $16,400 Chicago, Illinois, O'Hare International Airport, General Airport Revenue Refunding Bonds, Third Lien, AMT, Series C-2, 5.25% due 1/01/2030 (g) $ 17,294 Chicago, Illinois, O'Hare International Airport Revenue Bonds, Third Lien, AMT, Series B-2: 16,680 5.25% due 1/01/2027 (b) 17,609 26,230 6% due 1/01/2027 (b) 29,354 17,200 6% due 1/01/2029 (e) 19,259 =============================================================================== Louisiana -- 1.5% 15,000 Louisiana Public Facilities Authority, Mortgage Revenue Refunding Bonds (Baton Rouge General Medical Center Project), 5.25% due 7/01/2033 (b) 15,918 =============================================================================== Michigan -- 1.4% Michigan State Strategic Fund, Limited Obligation Revenue Refunding Bonds (Detroit Edison Company Pollution Control Project), AMT (e): 8,000 Series A, 5.50% due 6/01/2030 8,607 5,000 Series C, 5.65% due 9/01/2029 5,302 =============================================================================== New Jersey -- 3.1% New Jersey EDA, Motor Vehicle Surcharge Revenue Bonds, Series A (b): 14,665 5.25% due 7/01/2031 15,733 15,000 5.25% due 7/01/2033 16,093 =============================================================================== Nevada -- 1.3% 12,675 Clark County, Nevada, IDR (Southwest Gas Corporation Project), AMT, Series A, 5.25% due 7/01/2034 (a) 13,386 =============================================================================== Oklahoma -- 0.9% 8,680 Oklahoma State Industries Authority Revenue Refunding Bonds (Health System-Obligation Group), Series A, 5.75% due 8/15/2029 (b) 9,125 =============================================================================== Pennsylvania -- 1.7% 15,600 Pennsylvania State Turnpike Commission, Turnpike Revenue Bonds, Series A, 5.50% due 12/01/2031 (a) 17,171 =============================================================================== Texas -- 6.8% 21,000 Dallas-Fort Worth, Texas, International Airport Revenue Bonds, AMT, Series A, 5.50% due 11/01/2033 (b) 22,552 15,000 Dallas-Fort Worth, Texas, International Airport, Revenue Refunding and Improvement Bonds, AMT, Series A, 5.625% due 11/01/2026 (c) 15,932 30,000 Houston, Texas, Airport System Revenue Refunding Bonds, Sub-Lien, Series B, 5.50% due 7/01/2030 (g) 31,407 =============================================================================== Washington -- 4.4% 22,000 Port of Seattle, Washington, Revenue Bonds, AMT, Series B, 5.0% due 10/01/2032 (a) 23,060 20,565 Port of Seattle, Washington, Revenue Refunding Bonds, Series B, AMT, 5.20% due 7/01/2029 (b) 21,529 ------------------------------------------------------------------------------- Total Municipal Bonds Held in Trust (Cost -- $370,724) -- 38.1% 390,354 =============================================================================== Total Investments (Cost -- $1,730,880*) -- 176.5% 1,808,158 Liabilities in Excess of Other Assets -- (2.8%) (28,412) Liability for Trust Certificates, Including Interest Expense Payable -- (18.0%) (184,882) Preferred Stock, at Redemption Value -- (55.7%) (570,560) ---------- Net Assets Applicable to Common Stock -- 100.0% $1,024,304 ========== * The cost and unrealized appreciation (depreciation) of investments as of April 30, 2007 as computed for federal income tax purposes, were as follows: Aggregate cost ....................................... $ 1,560,054 =========== Gross unrealized appreciation ........................ $ 66,313 Gross unrealized depreciation ........................ (874) ----------- Net unrealized appreciation .......................... $ 65,439 =========== (a) AMBAC Insured. (b) MBIA Insured. (c) FGIC Insured. (d) CIFG Insured. (e) XL Capital Insured. (f) Prerefunded. (g) FSA Insured. (h) Security may have a maturity of more than one year at time of issuance, but has variable rate and demand features that qualify it as a short-term security. The rate disclosed is that currently in effect. This rate changes periodically based upon prevailing market rates. (i) Escrowed to maturity. (j) Securities represent underlying bonds transferred to a separate securitization trust established in a tender option bond transaction in which the Fund may have acquired the residual interest certificates. These securities serve as collateral in a financing transaction. See Note 1(c) to Financial Statements for details for Municipal Bonds Held in Trust. (k) FNMA/GNMA Collateralized. (l) FHLMC Collateralized. (m) Represents a zero coupon bond; the interest rate shown reflects the effective yield at the time of purchase. (n) Assured Guaranty Insured. (p) FHA Insured. o Investments in companies considered to be an affiliate of the Fund, for purposes of Section 2(a)(3) of the Investment Company Act of 1940, were as follows: -------------------------------------------------------------------------- Net Dividend Affiliate Activity Income -------------------------------------------------------------------------- Merrill Lynch Institutional Tax-Exempt Fund -- $ 71 -------------------------------------------------------------------------- 22 SEMI-ANNUAL REPORTS APRIL 30, 2007 Schedule of Investments (concluded) BlackRock MuniYield Insured Fund, Inc. (in Thousands) o Forward Interest Rate Swaps outstanding as of April 30, 2007 were as follows: -------------------------------------------------------------------------------- Unrealized Notional Appreciation Amount (Depreciation) -------------------------------------------------------------------------------- Pay a fixed rate of 5.339% and receive a floating rate based on 3 month LIBOR Broker, JPMorgan Chase Expires May 2016 $ 55,000 $ (954) Pay a fixed rate of 3.842% and receive a floating rate based on 1-Week Bond Market Association rate Broker, JPMorgan Chase Expires May 2017 $250,000 (3,727) Pay a fixed rate of 3.618% and receive a floating rate based on 1-Week Bond Market Association Rate Broker, JPMorgan Chase Expires June 2017 $ 40,000 116 Pay a fixed rate of 3.723% and receive a floating rate based on 1-Week Bond Market Association rate Broker, Citibank, N.A. Expires June 2022 $ 5,000 48 -------------------------------------------------------------------------------- Total $(4,517) ======= See Notes to Financial Statements. SEMI-ANNUAL REPORTS APRIL 30, 2007 23 Schedule of Investments as of April 30, 2007 (Unaudited) BlackRock MuniYield Quality Fund, Inc. (in Thousands) Face Amount Municipal Bonds Value ================================================================================ Alabama -- 0.7% $ 3,000 Jefferson County, Alabama, Limited Obligation School Warrants, Series A, 4.75% due 1/01/2025 $ 3,055 ================================================================================ California -- 17.6% 4,150 Alameda Corridor Transportation Authority, California, Capital Appreciation Revenue Refunding Bonds, Subordinate Lien, Series A, 5.45% due 10/01/2025 (a)(n) 3,434 1,250 Anaheim, California, Public Financing Authority, Electric System Distribution Facilities Revenue Bonds, Series A, 5% due 10/01/2031 (f) 1,305 2,200 Arcadia, California, Unified School District, Capital Appreciation, GO (Election of 2006), Series A, 4.96% due 8/01/2039 (f)(n) 459 7,405 Cabrillo, California, Community College District, GO (Election of 2004), Series B, 4.87% due 8/01/2038 (g)(n) 1,643 California State, GO: 2,790 5.50% due 4/01/2014 (h) 3,098 150 5.50% due 4/01/2028 164 California State, GO, Refunding: 4,450 5.25% due 9/01/2010 (h) 4,676 2,300 5.125% due 6/01/2027 2,405 3,450 California State University, Systemwide Revenue Bonds, Series A, 5% due 11/01/2035 (d) 3,603 California State, Various Purpose, GO: 10,000 5.25% due 11/01/2029 10,692 3,200 5.50% due 11/01/2033 3,480 3,875 Chabot-Las Positas, California, Community College District, GO (Election of 2004), Series B, 4.812% due 8/01/2025 (a)(n) 1,635 1,200 Chino Valley, California, Unified School District, GO (Election of 2002), Series C, 5.25% due 8/01/2030 (g) 1,300 2,150 East Side Union High School District, California, Santa Clara County, GO (Election of 2002), Series D, 5% due 8/01/2026 (b) 2,275 1,600 Golden State Tobacco Securitization Corporation of California, Tobacco Settlement Revenue Bonds, Series B, 5.50% due 6/01/2013 (b)(h) 1,748 5,000 Hacienda-La Puente, California, Unified School District, GO (Election of 2000), Series B, 5% due 8/01/2027 (f) 5,229 Metropolitan Water District of Southern California, Waterworks Revenue Bonds, Series B-1 (d): 4,000 5% due 10/01/2029 4,192 2,275 5% due 10/01/2036 2,382 2,000 Mount Diablo, California, Unified School District, GO (Election of 2002), 5% due 7/01/2027 (d) 2,090 2,750 Orange County, California, Sanitation District, COP, 5% due 2/01/2033 (d) 2,867 2,000 Poway, California, Redevelopment Agency, Tax Allocation Refunding Bonds (Paguay Redevelopment Project), 5.125% due 6/15/2033 (a) 2,092 2,100 Sacramento, California, Unified School District, GO (Election of 2002), 5% due 7/01/2030 (g) 2,224 9,000 San Diego County, California, Water Authority, Water Revenue Refunding Bonds, COP, Series A, 5% due 5/01/2032 (g) 9,398 2,725 San Mateo County, California, Community College District, GO (Election of 2001), Series A, 5% due 9/01/2026 (d) 2,840 1,700 San Mateo County, California, Union High School District, COP (Phase One Projects), Series B, 4.758% due 12/15/2043 (n) 961 1,950 Tamalpais, California, Union High School District, GO (Election of 2001), 5% due 8/01/2028 (f) 2,039 3,150 Ventura County, California, Community College District, GO (Election of 2002), Series B, 5% due 8/01/2030 (g) 3,335 ================================================================================ Colorado -- 3.8% 1,650 Colorado Health Facilities Authority Revenue Bonds (Catholic Health Initiatives), Series A, 5.50% due 3/01/2032 (c) 1,771 Colorado Health Facilities Authority Revenue Bonds (Covenant Retirement Communities Inc.), Series A (j): 1,600 5.50% due 12/01/2027 1,707 1,000 5.50% due 12/01/2033 1,063 9,000 E-470 Public Highway Authority, Colorado, Capital Appreciation Revenue Refunding Bonds, Series B, 5.485% due 9/01/2029 (g)(n) 2,963 11,125 Northwest Parkway, Colorado, Public Highway Authority, Capital Appreciation Revenue Bonds, Senior Convertible, Series C, 5.345% due 6/15/2011 (f)(n) 10,212 ================================================================================ District of Columbia -- 1.4% 2,500 District of Columbia, Revenue Refunding Bonds (Catholic University of America Project), 5.625% due 10/01/2029 (a) 2,620 6,000 District of Columbia, Revenue Refunding Bonds (Georgetown University Project), 4.82% due 4/01/2018 (a)(n) 3,687 ================================================================================ Florida -- 3.2% 2,235 Beacon Tradeport Community Development District, Florida, Special Assessment Revenue Refunding Bonds (Commercial Project), Series A, 5.625% due 5/01/2032 (j) 2,416 2,065 Highlands County, Florida, Health Facilities Authority, Hospital Revenue Bonds (Adventist Health System), Series C, 5.25% due 11/15/2036 2,161 4,700 Highlands County, Florida, Health Facilities Authority, Hospital Revenue Refunding Bonds (Adventist Health System), Series G, 5.125% due 11/15/2032 4,863 5,200 Orange County, Florida, Sales Tax Revenue Refunding Bonds, Series B, 5.125% due 1/01/2032 (d) 5,462 ================================================================================ Georgia -- 5.4% 3,500 Atlanta, Georgia, Airport Passenger Facility Charge and Subordinate Lien General Revenue Refunding Bonds, Series C, 5% due 1/01/2033 (f) 3,656 24 SEMI-ANNUAL REPORTS APRIL 30, 2007 Schedule of Investments (continued) BlackRock MuniYield Quality Fund, Inc. (in Thousands) Face Amount Municipal Bonds Value ================================================================================ Georgia (concluded) Atlanta, Georgia, Water and Wastewater Revenue Bonds: $ 4,270 5% due 11/01/2034 (f) $ 4,488 1,200 Series A, 5% due 11/01/2033 (g) 1,247 1,675 Series A, 5% due 11/01/2039 (g) 1,741 Augusta, Georgia, Water and Sewer Revenue Bonds (f): 5,000 5.25% due 10/01/2034 5,384 2,820 5.25% due 10/01/2039 3,027 4,785 Monroe County, Georgia, Development Authority, PCR, Refunding (Oglethorpe Power Corporation -- Scherer), Series A, 6.80% due 1/01/2011 5,256 ================================================================================ Hawaii -- 0.5% 2,000 Hawaii State, GO, Series CX, 5.50% due 2/01/2021 (f) 2,147 ================================================================================ Illinois -- 15.5% Chicago, Illinois, GO (Lakefront Millennium Parking Facilities) (g)(h): 5,000 5.125% due 1/01/2009 5,211 2,500 5.75% due 1/01/2012 (n) 2,760 Chicago, Illinois, O'Hare International Airport Revenue Bonds, Third Lien, AMT, Series B-2: 3,400 5.75% due 1/01/2023 (f) 3,733 4,000 5.75% due 1/01/2024 (f) 4,391 3,300 6% due 1/01/2029 (b) 3,695 Chicago, Illinois, O'Hare International Airport, Revenue Refunding Bonds: 2,665 3rd Lien, AMT, Series A-2, 5.75% due 1/01/2021 (f) 2,922 3 DRIVERS, AMT, Series 250, 7.191% due 1/01/2021 (g)(i)(r) 3 5,080 Cook County, Illinois, Capital Improvement, GO, Series C, 5.50% due 11/15/2012 (a)(h) 5,534 Illinois Sports Facilities Authority, State Tax Supported Revenue Bonds (a): 28,525 5.212% due 6/15/2030 (n) 26,749 5,500 5% due 6/15/2032 5,729 Metropolitan Pier and Exposition Authority, Illinois, Dedicated State Tax Revenue Refunding Bonds (McCormick Place Expansion Project): 7,000 5.50% due 12/15/2024 (d) 7,342 3,500 Series B, 5.75% due 6/15/2023 (g) 3,823 ================================================================================ Indiana -- 3.7% 4,500 Indiana Transportation Finance Authority, Highway Revenue Bonds, Series A, 5.25% due 6/01/2014 (d)(h) 4,911 Indianapolis, Indiana, Local Public Improvement Bond Bank, Revenue Refunding Bonds (Indianapolis Airport Authority Project), AMT, Series B (g): 6,470 5.25% due 1/01/2028 6,915 5,055 5.25% due 1/01/2030 5,399 ================================================================================ Louisiana -- 6.7% 5,100 Louisiana Local Government Environmental Facilities and Community Development Authority, Revenue Bonds (Capital Projects and Equipment Acquisition), Series A, 6.30% due 7/01/2030 (a) 6,108 2,800 Louisiana State Citizens Property Insurance Corporation, Assessment Revenue Bonds, Series B, 5% due 6/01/2023 (a) 2,965 5,300 Louisiana State, Gas and Fuels Tax Revenue Bonds, Series A, 4.75% due 5/01/2039 (f) 5,429 4,675 Louisiana State Transportation Authority, Senior Lien Toll Revenue Capital Appreciation Bonds, Series B, 5.31% due 12/01/2027 (a)(n) 1,630 New Orleans, Louisiana, Ernest N. Morial Exhibit Hall Authority, Special Tax, Sub-Series A (a): 6,150 5.25% due 7/15/2028 6,548 5,000 5% due 7/15/2033 5,216 800 Rapides Financing Authority, Louisiana, Revenue Bonds (Cleco Power LLC Project), AMT, 4.70% due 11/01/2036 (a) 804 1,900 Terrebonne Parish, Louisiana, Hospital Service District Number 1, Hospital Revenue Bonds (Terrebonne General Medical Center Project), 5.50% due 4/01/2033 (a) 2,055 ================================================================================ Maryland -- 1.3% 5,615 Baltimore, Maryland, Convention Center Hotel Revenue Bonds, Senior Series A, 5.25% due 9/01/2039 (b) 6,071 ================================================================================ Massachusetts -- 9.0% 3,550 Massachusetts Bay Transportation Authority, Revenue Refunding Bonds (General Transportation System), Series A, 7% due 3/01/2014 (g) 4,141 11,400 Massachusetts Bay Transportation Authority, Sales Tax Revenue Refunding Bonds, Senior Series A-2, 4.80% due 7/01/2032 (n) 3,468 3,730 Massachusetts Bay, Massachusetts, Transportation Authority, General Transportation System Revenue Refunding Bonds, Series A, 7% due 3/01/2011 (g) 4,158 2,200 Massachusetts State, HFA, S/F Housing Revenue Bonds, AMT, Series 128, 4.80% due 12/01/2027 2,212 3 Massachusetts State Port Authority, Special Facilities Revenue Bonds, DRIVERS, AMT, Series 501, 6.687% due 7/01/2009 (a)(i)(r) 3 Massachusetts State School Building Authority, Dedicated Sales Tax Revenue Bonds, Series A (f): 14,400 5% due 8/15/2030 15,230 4,300 4.75% due 8/15/2032 4,448 2,400 Massachusetts State Special Obligation Dedicated Tax Revenue Bonds, 5.25% due 1/01/2014 (d)(h) 2,606 1,210 Massachusetts State Water Resource Authority, General Revenue Refunding Bonds, Series B, 5.125% due 8/01/2027 (g) 1,272 4,000 Massachusetts State, HFA, Rental Housing Mortgage Revenue Bonds, AMT, Series C, 5.60% due 1/01/2045 (f) 4,240 ================================================================================ Michigan -- 3.7% 2,350 Detroit, Michigan, Sewage Disposal System, Second Lien Revenue Bonds, Series B, 5% due 7/01/2036 (d) 2,479 2,300 Michigan Higher Education Student Loan Authority, Student Loan Revenue Refunding Bonds, AMT, Series XVII-G, 5.20% due 9/01/2020 (a) 2,397 Michigan State Hospital Finance Authority, Hospital Revenue Refunding Bonds: 1,000 (Oakwood Obligated Group), Series A, 5% due 7/15/2025 1,033 1,700 (Detroit Edison Company Pollution Control Project), AMT, Series A, 5.50% due 6/01/2030 (b) 1,829 3,300 (Detroit Edison Company Pollution Control Project), AMT, Series C, 5.65% due 9/01/2029 (b) 3,499 SEMI-ANNUAL REPORTS APRIL 30, 2007 25 Schedule of Investments (continued) BlackRock MuniYield Quality Fund, Inc. (in Thousands) Face Amount Municipal Bonds Value ================================================================================ Michigan (concluded) $ 5,800 Michigan State Strategic Fund, Limited Obligation Revenue Refunding Bonds (Detroit Edison Company Pollution Control Project), AMT, Series C, 5.45% due 12/15/2032 (b) $ 6,160 ================================================================================ Minnesota -- 0.9% 4,199 Dakota County, Minnesota, Community Development Agency, S/F Mortgage Revenue Bonds (Mortgage- Backed Securities Program), Series B, 5.15% due 12/01/2038 (o)(p) 4,362 ================================================================================ Nebraska -- 2.0% 6,315 Municipal Energy Agency of Nebraska, Power Supply System Revenue Bonds, Series A, 5% due 4/01/2033 (f) 6,591 2,300 Washington County, Nebraska, Wastewater Facilities Revenue Bonds (Cargill Inc. Project), AMT, 5.90% due 11/01/2027 2,508 ================================================================================ Nevada -- 7.5% 4,100 Carson City, Nevada, Hospital Revenue Bonds (Carson-Tahoe Hospital Project), Series A, 5.50% due 9/01/2033 (j) 4,389 Clark County, Nevada, Airport System Subordinate Lien Revenue Bonds, Series A-2 (d): 2,000 5% due 7/01/2030 2,090 19,100 5% due 7/01/2036 19,916 2,300 Clark County, Nevada, IDR (Southwest Gas Corp. Project), AMT, Series A, 4.75% due 9/01/2036 (d) 2,312 5,710 Washoe County, Nevada, School District, GO, 5.875% due 12/01/2009 (f)(h) 6,018 ================================================================================ New Hampshire -- 3.4% 10,000 New Hampshire Health and Education Facilities Authority Revenue Bonds (Dartmouth-Hitchcock Obligation Group, 5.50% due 8/01/2027 (f) 10,728 5,000 New Hampshire State Business Finance Authority, PCR, Refunding (Public Service Company), AMT, Series D, 6% due 5/01/2021 (g) 5,196 ================================================================================ New Jersey -- 4.4% New Jersey EDA, Cigarette Tax Revenue Bonds: 910 5.75% due 6/15/2029 985 1,385 5.50% due 6/15/2031 1,470 5,500 New Jersey EDA, Motor Vehicle Surcharge Revenue Bonds, Series A, 5.25% due 7/01/2031 (g) 5,903 New Jersey EDA, School Facilities Construction Revenue Bonds, Series O: 3,860 5.125% due 3/01/2028 4,107 7,500 5.125% due 3/01/2030 7,969 ================================================================================ New York -- 4.7% 8,990 Metropolitan Transportation Authority, New York, Transportation Revenue Bonds, Series A, 5% due 11/15/2032 (d) 9,434 8,000 New York State Thruway Authority, General Revenue Refunding Bonds, Series G, 5% due 1/01/2032 (f) 8,461 3,570 Tobacco Settlement Financing Corporation of New York Revenue Bonds, Series A-1, 5.25% due 6/01/2022 (a) 3,821 ================================================================================ Ohio -- 2.2% 2,500 Columbus, Ohio, City School District, GO (School Facilities Construction and Improvements), 5.25% due 12/01/2014 (f)(h) 2,742 2,000 Jackson, Ohio, Hospital Facilities Revenue Bonds (Consolidated Health System -- Jackson Hospital), 6.125% due 10/01/2009 (h)(j) 2,127 5,250 Ohio State Air Quality, Development Authority Revenue Bonds (Dayton Power and Light Company Project), 4.80% due 9/01/2036 (d) 5,322 ================================================================================ Oklahoma -- 0.5% Tulsa, Oklahoma, Airports Improvement Trust, General Revenue Bonds (Tulsa International Airport), AMT, Series B (d): 1,000 6% due 6/01/2019 1,056 1,000 6.125% due 6/01/2026 1,059 ================================================================================ Pennsylvania -- 5.6% Pennsylvania State Public School Building Authority, School Lease Revenue Bonds (The School District of Philadelphia Project) (f)(h): 11,750 5% due 6/01/2013 12,555 6,000 5.25% due 6/01/2013 6,492 6,250 Philadelphia, Pennsylvania, Authority for Industrial Development, Lease Revenue Bonds, Series B, 5.50% due 10/01/2021 (f) 6,707 ================================================================================ Rhode Island -- 0.5% 2,500 Providence, Rhode Island, GO, Series A, 5.70% due 7/15/2007 (f)(h) 2,535 ================================================================================ South Carolina -- 4.6% 3,750 Berkeley County, South Carolina, School District, Installment Lease Revenue Bonds (Securing Assets for Education Project), 5.125% due 12/01/2030 3,973 3,200 Kershaw County, South Carolina, Public Schools Foundation, Installment Power Revenue Refunding Bonds,5% due 12/01/2029 (k) 3,372 4,500 Scago Educational Facilities Corporation for Pickens County School District, South Carolina, Revenue Bonds, 5% due 12/01/2031 (f) 4,734 8,900 South Carolina Transportation Infrastructure Bank Revenue Bonds, Series A, 5% due 10/01/2033 (a) 9,277 ================================================================================ Tennessee -- 3.9% 7,850 Chattanooga, Tennessee, IDB, Lease Rent Revenue Bonds (Southside Redevelopment Corporation), 5.875% due 10/01/2024 (a) 8,352 5,000 Memphis-Shelby County, Tennessee, Airport Authority, Airport Revenue Bonds, AMT, Series D, 6.25% due 3/01/2018 (a) 5,335 Tennessee HDA, Homeownership Revenue Bonds, AMT, Series 2-C (a): 2,075 6.10% due 7/01/2013 2,128 2,390 6.20% due 7/01/2015 2,434 ================================================================================ Texas -- 12.0% 2,000 Austin, Texas, Convention Center Revenue Bonds (Convention Enterprises Inc.), Trust Certificates, Second Tier, Series B, 6% due 1/01/2011 (h) 2,152 1,000 Bell County, Texas, Health Facilities Development Revenue Bonds (Lutheran General Health Care System), 6.50% due 7/01/2019 (c) 1,210 Dallas-Fort Worth, Texas, International Airport Revenue Refunding and Improvement Bonds, AMT, Series A (d): 1,835 5.875% due 11/01/2017 1,971 2,145 5.875% due 11/01/2018 2,304 2,385 5.875% due 11/01/2019 2,562 26 SEMI-ANNUAL REPORTS APRIL 30, 2007 Schedule of Investments (continued) BlackRock MuniYield Quality Fund, Inc. (in Thousands) Face Amount Municipal Bonds Value =============================================================================== Texas (concluded) Gregg County, Texas, Health Facilities Development Corporation, Hospital Revenue Bonds (Good Shepherd Medical Center Project) (h)(j): $ 2,600 6.375% due 10/01/2010 $ 2,839 6,000 6.875% due 10/01/2010 6,646 4,000 Harris County -- Houston Sports Authority, Texas, Revenue Refunding Bonds, Senior Lien, Series G, 5.75% due 11/15/2020 (g) 4,300 Leander, Texas, Independent School District, Capital Appreciation, GO, Refunding (School Building) (n): 9,250 5.46% due 8/15/2028 (d) 3,142 13,350 5.58% due 8/15/2035 2,999 6,150 Lewisville, Texas, Independent School District, Capital Appreciation and School Building, GO, Refunding, 4.748% due 8/15/2024 (d)(n) 2,741 7,150 North Harris County, Texas, Regional Water Authority, Senior Lien Revenue Bonds, 5.125% due 12/15/2035 (g) 7,522 2,100 Texas State Affordable Housing Corporation, S/F Mortgage Revenue Bonds (Professional Educators Program), AMT, Series A-1, 5.50% due 12/01/2039 (o)(p) 2,247 7,200 Texas State Turnpike Authority, Central Texas Turnpike System Revenue Bonds, First Tier, Series A, 5.75% due 8/15/2038 (a) 7,813 4,600 Travis County, Texas, Health Facilities Development Corporation, Revenue Refunding Bonds (Ascension Health Credit), Series A, 6.25% due 11/15/2009 (g)(h) 4,920 =============================================================================== Utah -- 3.7% 15,000 Salt Lake City, Utah, Hospital Revenue Refunding Bonds (IHC Hospitals Inc.), 6.30% due 2/15/2015 (g) 17,040 =============================================================================== Virginia -- 0.7% 3,100 Halifax County, Virginia, IDA, Exempt Facility Revenue Refunding Bonds (Old Dominion Electric Cooperative Project), AMT, 5.625% due 6/01/2028 (a) 3,381 =============================================================================== Washington -- 2.7% 2,400 Port of Tacoma, Washington, Revenue Refunding Bonds, Series A, 5.25% due 12/01/2014 (a)(h) 2,633 5,100 Tacoma, Washington, Regional Water Supply System, Water Revenue Bonds, 5% due 12/01/2032 (g) 5,296 4,125 Washington State, GO, Series A and AT-6, 6.25% due 2/01/2011 (f) 4,338 =============================================================================== Puerto Rico -- 1.6% 6,925 Puerto Rico Electric Power Authority, Power Revenue Bonds, Series NN, 5.125% due 7/01/2029 7,243 ------------------------------------------------------------------------------- Total Municipal Bonds (Cost -- $589,010) -- 133.4% 617,369 =============================================================================== =============================================================================== Municipal Bonds Held in Trust (m) =============================================================================== Arizona -- 1.4% 6,000 Maricopa County, Arizona, Public Finance Corporation, Lease Revenue Bonds, 5.50% due 7/01/2014 (a) 6,403 =============================================================================== California -- 7.0% 5,700 California State, GO, Refunding, 5.25% due 2/01/2033 (j) 6,087 Golden State Tobacco Securitization Corporation of California, Tobacco Settlement Revenue Bonds, Series B (h): 10,000 5.50% due 6/01/2013 (b) 10,927 14,160 5.625% due 6/01/2013 (k) 15,568 =============================================================================== Georgia -- 2.3% 10,000 Atlanta, Georgia, Airport Passenger Facility Charge, Subordinate Lien Revenue Refunding Bonds, Series C, 5% due 1/01/2033 (f) 10,446 =============================================================================== Illinois -- 9.4% 10,000 Chicago, Illinois, Board of Education, GO (Chicago School Reform Project), 5.75% due 12/01/2027 (a) 10,312 Chicago, Illinois, O'Hare International Airport, General Airport Revenue Refunding Bonds, Third Lien, AMT, Series A (g): 13,665 5.75% due 1/01/2021 14,625 5,000 5.50% due 1/01/2022 5,279 12,500 5.375% due 1/01/2032 13,111 =============================================================================== Massachusetts -- 0.9% 3,825 Massachusetts State Port Authority, Special Facilities Revenue Bonds (Delta Air Lines Inc. Project), AMT, Series A, 5.50% due 1/01/2019 (a) 4,041 =============================================================================== New Jersey -- 3.1% New Jersey EDA, Cigarette Tax Revenue Bonds (e): 7,150 5.50% due 6/15/2024 7,687 6,000 5.50% due 6/15/2031 6,572 =============================================================================== New York -- 3.2% 13,840 New York City, New York, GO, Series B, 5.875% due 8/01/2016 (g) 14,863 =============================================================================== Oregon -- 3.4% 15,000 Portland, Oregon, Sewer System Revenue Bonds, Series A, 5.75% due 8/01/2010 (d)(h) 15,946 =============================================================================== Texas -- 2.4% 10,470 Denton, Texas, Utility System Revenue Bonds, Series A, 6% due 12/01/2010 (f)(h) 11,268 =============================================================================== Washington -- 3.5% 15,000 Energy Northwest, Washington, Electric Revenue Refunding Bonds (Project Number 1), Series A, 5.75% due 7/01/2017 (g) 16,364 ------------------------------------------------------------------------------- Total Municipal Bonds Held in Trust (Cost -- $162,425) -- 36.6% 169,499 =============================================================================== =============================================================================== Shares Held Short-Term Securities =============================================================================== 3,015 Merrill Lynch Institutional Tax-Exempt Fund, 3.70% (l)(q) 3,015 ------------------------------------------------------------------------------- Total Short-Term Securities (Cost -- $3,015) -- 0.6% 3,015 =============================================================================== Total Investments (Cost -- $754,450*) -- 170.6% 789,883 Other Assets Less Liabilities -- 0.9% 4,092 Liability for Trust Certificates, Including Interest Expense Payable -- (17.5%) (80,904) Preferred Stock, at Redemption Value -- (54.0%) (250,156) ---------- Net Assets Applicable to Common Stock -- 100.0% $ 462,915 ========== SEMI-ANNUAL REPORTS APRIL 30, 2007 27 Schedule of Investments (concluded) BlackRock MuniYield Quality Fund, Inc. (in Thousands) * The cost and unrealized appreciation (depreciation) of investments as of April 30, 2007, as computed for federal income tax purposes, were as follows: Aggregate Cost ......................................... $ 676,026 ========= Gross unrealized appreciation .......................... $ 34,155 Gross unrealized depreciation .......................... (196) --------- Net unrealized appreciation ............................ $ 33,959 ========= (a) AMBAC Insured. (b) XL Capital Insured. (c) Escrowed to maturity. (d) FGIC Insured. (e) Assured Guaranty Insured. (f) FSA Insured. (g) MBIA Insured. (h) Prerefunded. (i) The rate disclosed is that currently in effect. This rate changes periodically and inversely based upon prevailing market rates. (j) Radian Insured. (k) CIFG Insured. (l) Investments in companies considered to be an affiliate of the Fund, for purposes of Section 2(a)(3) of the Investment Company Act of 1940, were as follows: -------------------------------------------------------------------------- Net Dividend Affiliate Activity Income -------------------------------------------------------------------------- Merrill Lynch Institutional Tax-Exempt Fund (3,701) $87 -------------------------------------------------------------------------- (m) Securities represent underlying bonds transferred to a separate securitization trust established in a tender option bond transaction in which the Fund may have acquired the residual interest certificates. These securities serve as collateral in a financing transaction. See Note 1(c) to Financial Statements for details of Municipal Bonds Held in Trust. (n) Represents a step or zero coupon bond; the interest rate shown reflects the effective yield at the time of purchase. (o) FNMA/GNMA Collateralized. (p) FHLMC Collateralized. (q) Represents the current yield as of April 30, 2007. (r) These securities are short-term floating rate certificates issued by tender option bond trusts and are secured by the underlying municipal bond securities. o Forward interest rate swaps outstanding as of April 30, 2007 were as follows: -------------------------------------------------------------------------- Notional Unrealized Amount Depreciation -------------------------------------------------------------------------- Pay a fixed rate of 3.842% and receive a floating rate based on 1-week Bond Market Association Rate Broker, JPMorgan Chase Expires May 2017 $40,000 $(596) -------------------------------------------------------------------------- Total $(596) ===== See Notes to Financial Statements. 28 SEMI-ANNUAL REPORTS APRIL 30, 2007 Schedule of Investments as of April 30, 2007 (Unaudited) BlackRock MuniYield Quality Fund II, Inc. (in Thousands) Face Amount Municipal Bonds Value ================================================================================ Alabama -- 0.7% $ 2,000 Jefferson County, Alabama, Limited Obligation School Warrants, Series A, 4.75% due 1/01/2025 $ 2,037 ================================================================================ Arizona -- 0.7% 1,800 Northern Arizona University System Revenue Bonds, 5.50% due 6/01/2014 (c)(g) 1,993 ================================================================================ California -- 24.4% 7,150 Alameda Corridor Transportation Authority, California, Capital Appreciation Revenue Refunding Bonds, Subordinate Lien, Series A, 5.33% due 10/01/2025 (a)(n) 5,917 3,800 Anaheim, California, Public Financing Authority, Electric System Distribution Facilities Revenue Bonds, Series A, 5% due 10/01/2031 (f) 3,967 1,400 Arcadia, California, Unified School District, Capital Appreciation, GO (Election of 2006), Series A, 4.96% due 8/01/2039 (f)(n) 292 4,800 Cabrillo, California, Community College District, GO (Election of 2004), Series B, 4.87% due 8/01/2038 (i)(n) 1,065 2,500 California Health Facilities Financing Authority Revenue Bonds (Kaiser Permanente), RIB, Series 26, 6.79% due 6/01/2022 (f)(j) 2,691 California State, GO, Refunding: 2,200 5.25% due 9/01/2010 (g) 2,312 1,500 5.125% due 6/01/2027 1,569 1,600 California State Public Works Board, Lease Revenue Bonds (Department of Corrections), Series C, 5% due 6/01/2025 1,666 2,200 California State University, Systemwide Revenue Bonds, Series A, 5% due 11/01/2035 (c) 2,297 California State, Various Purpose, GO: 2,750 5.25% due 11/01/2029 2,940 6,500 5.50% due 11/01/2033 7,069 2,500 Chabot-Las Positas, California, Community College District, GO (Election of 2004), Series B, 4.812% due 8/01/2025 (a)(n) 1,055 East Side Union High School District, California, Santa Clara County, GO (h): 15,000 Capital Appreciation, Series E, 5.15% due 8/01/2029 5,053 1,370 Series D, 5% due 8/01/2026 1,450 2,770 Fairfield-Suisun, California, Unified School District, GO (Election of 2002), 5.50% due 8/01/2028 (i) 3,040 Golden State Tobacco Securitization Corporation of California, Tobacco Settlement Revenue Bonds, Series B (g): 2,300 5.50% due 6/01/2013 (h) 2,513 3,725 5.625% due 6/01/2013 (b) 4,095 2,815 John Swett Unified School District, California, GO, Series A, 5.50% due 8/01/2026 (f) 3,015 Metropolitan Water District of Southern California, Waterworks Revenue Bonds, Series B-1 (c): 2,600 5% due 10/01/2029 2,725 1,475 5% due 10/01/2036 1,544 2,300 Orange County, California, Sanitation District, COP, 5% due 2/01/2033 (c) 2,398 2,900 Palm Springs, California, Financing Authority, Lease Revenue Refunding Bonds (Convention Center Project), Series A, 5.50% due 11/01/2029 (i) 3,217 1,250 Poway, California, Redevelopment Agency, Tax Allocation Refunding Bonds (Paguay Redevelopment Project), 5.125% due 6/15/2033 (a) 1,307 5,000 Sacramento, California, Municipal Utility District, Electric Revenue Bonds, Series N, 5% due 8/15/2028 (i) 5,187 1,350 Sacramento, California, Unified School District, GO (Election of 2002), 5% due 7/01/2030 (i) 1,430 1,100 San Mateo, California, Union High School District, COP (Phase One Projects), Series B, 4.486% due 12/15/2043 (a)(n) 622 1,325 Tamalpais, California, Union High School District, GO (Election of 2001), 5% due 8/01/2028 (f) 1,386 2,025 Ventura County, California, Community College District, GO (Election of 2002), Series B, 5% due 8/01/2030 (i) 2,144 ================================================================================ Colorado -- 5.7% Colorado Health Facilities Authority Revenue Bonds, Series A: 1,150 (Catholic Health Initiatives), 5.50% due 3/01/2032 (d) 1,235 1,200 (Covenant Retirement Communities Inc.), 5.50% due 12/01/2027 (k) 1,280 675 (Covenant Retirement Communities Inc.), 5.50% due 12/01/2033 (k) 717 7,500 E-470 Public Highway Authority, Colorado, Capital Appreciation Revenue Refunding Bonds, Series B, 5.607% due 9/01/2032 (i)(n) 2,073 10,975 Northwest Parkway, Colorado, Public Highway Authority, Capital Appreciation Revenue Bonds, Senior Convertible, Series C, 5.327% due 6/15/2011 (f)(n) 10,074 1,735 Northwest Parkway, Colorado, Public Highway Authority Revenue Bonds, Series A, 5.50% due 6/15/2021 (a) 1,870 ================================================================================ District of Columbia -- 0.8% 4,000 District of Columbia, Revenue Refunding Bonds (Georgetown University Project), 4.598% due 4/01/2018 (a)(n) 2,458 ================================================================================ Florida -- 2.3% 1,250 Highlands County, Florida, Health Facilities Authority, Hospital Revenue Bonds (Adventist Health System), Series C, 5.25% due 11/15/2036 1,308 1,700 Highlands County, Florida, Health Facilities Authority, Hospital Revenue Refunding Bonds (Adventist Health System), Series G, 5.125% due 11/15/2032 1,759 3,575 Orange County, Florida, Sales Tax Revenue Refunding Bonds, Series B, 5.125% due 1/01/2032 (c) 3,755 ================================================================================ Georgia -- 6.8% 5,000 Atlanta, Georgia, Airport General Revenue Refunding Bonds, Series B, 5.25% due 1/01/2033 (f) 5,354 5,000 Atlanta, Georgia, Airport Revenue Refunding Bonds, Series A, 5.875% due 1/01/2017 (c) 5,314 Atlanta, Georgia, Water and Wastewater Revenue Bonds: 2,850 5% due 11/01/2034 (f) 2,995 800 Series A, 5% due 11/01/2033 (i) 832 4,075 Series A, 5% due 11/01/2039 (i) 4,236 1,880 Augusta, Georgia, Water and Sewer Revenue Bonds, 5.25% due 10/01/2039 (f) 2,018 ================================================================================ SEMI-ANNUAL REPORTS APRIL 30, 2007 29 Schedule of Investments (continued) BlackRock MuniYield Quality Fund II, Inc. (in Thousands) Face Amount Municipal Bonds Value ================================================================================ Illinois -- 15.7% Chicago, Illinois, O'Hare International Airport Revenue Bonds, Third Lien, AMT, Series B-2: $ 5,200 5.75% due 1/01/2023 (f) $ 5,709 2,200 6% due 1/01/2029 (h) 2,463 2,460 Cook County, Illinois, Capital Improvement, GO, Series C, 5.50% due 11/15/2012 (a)(g) 2,680 10,000 Illinois Regional Transportation Authority Revenue Bonds, 6.50% due 7/01/2026 (i) 13,007 21,675 Illinois Sports Facilities Authority, State Tax Supported Revenue Bonds, 5.264% due 6/15/2030 (a)(n) 20,325 3,500 Metropolitan Pier and Exposition Authority, Illinois, Dedicated State Tax Revenue Bonds (McCormick Place Expansion), Series A, 5% due 12/15/2028 (i) 3,654 ================================================================================ Indiana -- 2.4% 6,750 Indiana Transportation Finance Authority, Highway Revenue Bonds, Series A, 5.25% due 6/01/2014 (c)(g) 7,366 ================================================================================ Louisiana -- 8.2% 1,850 Jefferson Parish, Louisiana, Home Mortgage Authority, S/F Mortgage Revenue Bonds, AMT, Series B-1, 6.65% due 12/01/2033 (e)(i) 1,924 5,500 Lafayette, Louisiana, Utilities Revenue Bonds, 5% due 11/01/2028 (i) 5,795 2,300 Louisiana Local Government Environmental Facilities and Community Development Authority, Revenue Bonds (Capital Projects and Equipment Acquisition), Series A, 6.30% due 7/01/2030 (a) 2,754 1,800 Louisiana State Citizens Property Insurance Corporation, Assessment Revenue Bonds, Series B, 5% due 6/01/2023 (a) 1,906 3,500 Louisiana State, Gas and Fuels Tax Revenue Bonds, Series A, 4.75% due 5/01/2039 (f) 3,585 3,185 Louisiana State Transportation Authority, Senior Lien Toll Revenue Capital Appreciation Bonds, Series B, 5.31% due 12/01/2027 (a)(n) 1,110 4,200 New Orleans, Louisiana, Ernest N. Morial Exhibit Hall Authority, Special Tax, Sub-Series A, 5.25% due 7/15/2028 (a) 4,472 1,750 Rapides Financing Authority, Louisiana, Revenue Bonds (Cleco Power LLC Project), AMT, 4.70% due 11/01/2036 (a) 1,758 1,300 Terrebonne Parish, Louisiana, Hospital Service District Number 1, Hospital Revenue Bonds (Terrebonne General Medical Center Project), 5.50% due 4/01/2033 (a) 1,406 ================================================================================ Massachusetts -- 3.5% 1,500 Massachusetts State HFA, S/F Housing Revenue Bonds, AMT, Series 128, 4.80% due 12/01/2027 (f) 1,508 5,800 Massachusetts State School Building Authority, Dedicated Sales Tax Revenue Bonds, Series A, 5% due 8/15/2030 (f) 6,134 1,800 Massachusetts State Special Obligation Dedicated Tax Revenue Bonds, 5.25% due 1/01/2014 (c)(g) 1,955 840 Massachusetts State Water Resource Authority, General Revenue Refunding Bonds, Series B, 5.125% due 8/01/2027 (i) 883 ================================================================================ Michigan -- 3.7% 1,500 Detroit, Michigan, Sewage Disposal System, Second Lien Revenue Bonds, Series B, 5% due 7/01/2036 (c) 1,582 1,000 Michigan Higher Education Student Loan Authority, Student Loan Revenue Refunding Bonds, AMT, Series XVII-G, 5.20% due 9/01/2020 (a) 1,042 3,335 Michigan State Hospital Finance Authority, Hospital Revenue Refunding Bonds (Sparrow Obligated Group), 5% due 11/15/2036 3,431 Michigan State Strategic Fund, Limited Obligation Revenue Refunding Bonds (Detroit Edison Company Pollution Control Project), AMT (h): 1,000 Series A, 5.50% due 6/01/2030 1,076 3,900 Series C, 5.45% due 12/15/2032 4,142 ================================================================================ Minnesota -- 0.9% 2,699 Dakota County, Minnesota, Community Development Agency, S/F Mortgage Revenue Bonds (Mortgage- Backed Securities Program), Series B, 5.15% due 12/01/2038 (e)(p) 2,804 ================================================================================ Missouri -- 1.9% Saint Louis County, Missouri, Pattonville R-3 School District, GO (Missouri Direct Deposit Program) (c)(g): 4,000 5.75% due 3/01/2010 4,254 1,500 6% due 3/01/2010 1,606 ================================================================================ Nebraska -- 0.4% 1,300 Municipal Energy Agency of Nebraska, Power Supply System Revenue Bonds, Series A, 5% due 4/01/2033 (f) 1,357 ================================================================================ Nevada -- 3.2% 2,800 Carson City, Nevada, Hospital Revenue Bonds (Carson -- Tahoe Hospital Project), Series A, 5.50% due 9/01/2033 (k) 2,997 Clark County, Nevada, Airport System Subordinate Lien Revenue Bonds, Series A-2 (c): 1,500 5% due 7/01/2030 1,568 2,700 5% due 7/01/2036 2,815 2,200 Clark County, Nevada, IDR (Southwest Gas Corp. Project), AMT, Series A, 4.75% due 9/01/2036 (c) 2,211 ================================================================================ New Jersey -- 5.9% New Jersey EDA, Cigarette Tax Revenue Bonds: 1,070 5.75% due 6/15/2029 1,158 500 5.50% due 6/15/2031 531 New Jersey EDA, Motor Vehicle Surcharge Revenue Bonds, Series A (i): 2,400 5% due 7/01/2029 2,525 4,800 5.25% due 7/01/2033 5,149 New Jersey EDA, School Facilities Construction Revenue Bonds: 4,250 Series O, 5.125% due 3/01/2028 4,522 4,000 Series P, 5.125% due 9/01/2028 4,258 ================================================================================ New Mexico -- 2.2% 6,295 New Mexico State Highway Commission, Tax Revenue Bonds, Senior Sub-Lien, Series A, 6% due 6/15/2010 (f)(g) 6,709 ================================================================================ New York -- 10.4% Metropolitan Transportation Authority, New York, Transportation Revenue Bonds, Series A: 1,800 5% due 11/15/2032 (c) 1,889 7,500 5% due 11/15/2035 7,901 30 SEMI-ANNUAL REPORTS APRIL 30, 2007 Schedule of Investments (continued) BlackRock MuniYield Quality Fund II, Inc. (in Thousands) Face Amount Municipal Bonds Value ================================================================================ New York (concluded) $ 9,280 Nassau Health Care Corporation, New York, Health System Revenue Bonds, 5.75% due 8/01/2009 (f)(g) $ 9,877 5,000 New York State Dormitory Authority, Revenue Refunding Bonds (State University Educational Facilities), 5.75% due 5/15/2010 (c)(g) 5,347 6,115 Tobacco Settlement Financing Corporation of New York Revenue Bonds, Series A-1, 5.25% due 6/01/2022 (a) 6,545 ================================================================================ Ohio -- 4.6% 7,100 Ohio State Air Quality, Development Authority Revenue Bonds (Dayton Power and Light Company Project), 4.80% due 9/01/2036 (c) 7,198 Plain, Ohio, Local School District, GO, Refunding (c): 5,120 6% due 6/01/2011 (g) 5,571 1,170 6% due 12/01/2020 1,268 ================================================================================ Pennsylvania -- 3.9% 5,500 Pennsylvania State Public School Building Authority, School Lease Revenue Bonds (The School District of Philadelphia Project), 5% due 6/01/2013 (f)(g) 5,877 3,230 Philadelphia, Pennsylvania, Authority for Industrial Development, Lease Revenue Bonds, Series B, 5.50% due 10/01/2020 (f) 3,480 2,350 Philadelphia, Pennsylvania, Gas Works Revenue Refunding Bonds, 1998 General Ordinance, 7th Series, 5% due 10/01/2032 2,476 ================================================================================ Rhode Island -- 1.4% 4,010 Rhode Island State Health and Educational Building Corporation, Higher Education Facilities Revenue Bonds (University of Rhode Island), Series A, 5.70% due 9/15/2009 (g)(i) 4,230 ================================================================================ South Carolina -- 4.8% 2,450 Berkeley County, South Carolina, School District, Installment Lease Revenue Bonds (Securing Assets for Education Project), 5.125% due 12/01/2030 2,595 2,075 Kershaw County, South Carolina, Public Schools Foundation, Installment Power Revenue Refunding Bonds, 5% due 12/01/2029 (b) 2,186 3,000 Scago Educational Facilities Corporation for Pickens County School District, South Carolina, Revenue Bonds, 5% due 12/01/2031 (f) 3,156 6,100 South Carolina Transportation Infrastructure Bank Revenue Bonds, Series A, 5% due 10/01/2033 (a) 6,358 ================================================================================ Tennessee -- 0.8% 2,150 Chattanooga, Tennessee, IDB, Lease Rent Revenue Bonds (Southside Redevelopment Corporation), 5.875% due 10/01/2024 (a) 2,287 ================================================================================ Texas -- 10.6% 2,000 Corpus Christi, Texas, Utility System Revenue Refunding Bonds, Series A, 6% due 7/15/2010 (f)(g) 2,137 4,000 Gregg County, Texas, Health Facilities Development Corporation, Hospital Revenue Bonds (Good Shepherd Medical Center Project), 6.875% due 10/01/2010 (g)(k) 4,431 Leander, Texas, Independent School District, Capital Appreciation, GO, Refunding (School Building) (n): 9,345 5.51% due 8/15/2030 (c) 2,827 8,800 5.58% due 8/15/2035 1,977 3,915 Lewisville, Texas, Independent School District, Capital Appreciation and School Building, GO, Refunding, 4.67% due 8/15/2024 (c)(n) 1,745 3,500 Lower Colorado River Authority, Texas, PCR (Samsung Austin Semiconductor), AMT, 6.375% due 4/01/2027 3,576 4,925 North Harris County, Texas, Regional Water Authority, Senior Lien Revenue Bonds, 5.125% due 12/15/2035 (i) 5,181 1,300 Texas State Affordable Housing Corporation, S/F Mortgage Revenue Bonds (Professional Educators Program), AMT, Series A-1, 5.50% due 12/01/2039 (e)(p) 1,391 Texas State Turnpike Authority, Central Texas Turnpike System Revenue Bonds, First Tier, Series A (a): 4,800 5.75% due 8/15/2038 5,209 3,600 5.50% due 8/15/2039 3,862 ================================================================================ Virginia -- 0.8% 2,100 Halifax County, Virginia, IDA, Exempt Facility Revenue Refunding Bonds (Old Dominion Electric Cooperative Project), AMT, 5.625% due 6/01/2028 (a) 2,291 ================================================================================ Washington -- 5.4% 7,470 Port of Seattle, Washington, Revenue Bonds, AMT, Series B, 6% due 2/01/2016 (i) 7,937 1,600 Port of Tacoma, Washington, Revenue Refunding Bonds, Series A, 5.25% due 12/01/2014 (a)(g) 1,755 6,150 Seattle, Washington, Municipal Light and Power Revenue Bonds, 6% due 10/01/2009 (g)(i) 6,535 ================================================================================ Puerto Rico -- 1.2% 3,375 Puerto Rico Electric Power Authority, Power Revenue Bonds, Series NN, 5.125% due 7/01/2029 3,530 -------------------------------------------------------------------------------- Total Municipal Bonds (Cost -- $383,241) -- 133.3% 404,030 ================================================================================ ================================================================================ Municipal Bonds Held in Trust (j) ================================================================================ California -- 1.4% 3,900 California State, GO, Refunding, 5.25% due 2/01/2033 (k) 4,165 ================================================================================ Georgia -- 5.9% 17,000 Atlanta, Georgia, Airport Passenger Facility Charge, Subordinate Lien Revenue Refunding Bonds, Series C, 5% due 1/01/2033 (f) 17,758 ================================================================================ Illinois -- 5.9% 9,500 Chicago, Illinois, O'Hare International Airport, General Airport Revenue Refunding Bonds, Third Lien, AMT, Series A, 5.50% due 1/01/2022 (i) 10,030 7,250 Metropolitan Pier and Exposition Authority, Illinois, Dedicated State Tax Revenue Refunding Bonds (McCormick Place Expansion Project), Series B, 5.75% due 6/15/2023 (i) 7,920 ================================================================================ SEMI-ANNUAL REPORTS APRIL 30, 2007 31 Schedule of Investments (concluded) BlackRock MuniYield Quality Fund II, Inc. (in Thousands) Face Amount Municipal Bonds Held in Trust (j) Value =============================================================================== Massachusetts -- 8.7% $20,000 Massachusetts State HFA, Housing Revenue Bonds (Rental Mortgage), AMT, Series F, 5.25% due 1/01/2046 (f) $ 20,581 Massachusetts State Port Authority, Special Facilities Revenue Bonds (Delta Air Lines Inc. Project), AMT, Series A (a): 2,900 5.50% due 1/01/2016 3,064 2,670 5.50% due 1/01/2019 2,821 =============================================================================== New Jersey -- 3.1% New Jersey EDA, Cigarette Tax Revenue Bonds (l): 4,600 5.50% due 6/15/2024 4,945 4,000 5.50% due 6/15/2031 4,382 =============================================================================== Pennsylvania -- 2.3% 6,670 Delaware River Port Authority of Pennsylvania and New Jersey Revenue Bonds, 6% due 1/01/2017 (f) 7,052 =============================================================================== South Carolina -- 5.6% Charleston Educational Excellence Financing Corporation, South Carolina, Revenue Bonds (Charleston County School District) (l): 2,725 5.25% due 12/01/2028 2,942 2,425 5.25% due 12/01/2029 2,618 880 5.25% due 12/01/2030 949 10,000 South Carolina Transportation Infrastructure Bank Revenue Bonds, Series A, 5% due 10/01/2033 (a) 10,423 =============================================================================== Texas -- 2.2% 6,500 Dallas-Fort Worth, Texas, International Airport Revenue Bonds, AMT, Series A, 6% due 11/01/2028 (c) 6,806 ------------------------------------------------------------------------------- Total Municipal Bonds Held in Trust (Cost -- $104,401) -- 35.1% 106,456 =============================================================================== =============================================================================== Shares Held Short-Term Securities =============================================================================== 2,814 Merrill Lynch Institutional Tax-Exempt Fund, 3.70% (m)(o) 2,814 ------------------------------------------------------------------------------- Total Short-Term Securities (Cost -- $2,814) -- 0.9% 2,814 =============================================================================== Total Investments (Cost -- $490,456*) -- 169.3% 513,300 Other Assets Less Liabilities -- 0.4% 1,109 Liability for Trust Certificates, Including Interest Expense Payable -- (16.9%) (51,152) Preferred Stock, at Redemption Value -- (52.8%) (160,132) ---------- Net Assets Applicable to Common Stock -- 100.0% $ 303,125 ========== * The cost and unrealized appreciation (depreciation) of investments as of April 30, 2007, as computed for federal income tax purposes, were as follows: Aggregate cost ......................................... $ 440,723 ========= Gross unrealized appreciation .......................... $ 22,271 Gross unrealized depreciation .......................... (204) --------- Net unrealized appreciation ............................ $ 22,067 ========= (a) AMBAC Insured. (b) CIFG Insured. (c) FGIC Insured. (d) Escrowed to maturity. (e) FNMA/GNMA Collateralized. (f) FSA Insured. (g) Prerefunded. (h) XL Capital Insured. (i) MBIA Insured. (j) Securities represent underlying bonds transferred to a separate securitization trust established in a tenor option bond transaction in which the Fund may have acquired the residual interest certificates. These securities serve as collateral in a financing transaction. See Note 1(c) to Financial Statements for details for Municipal Bonds Held in Trust. (k) Radian Insured. (l) Assured Guaranty Insured. (m) Investments in companies considered to be an affiliate of the Fund, for purposes of Section 2(a)(3) of the Investment Company Act of 1940, were as follows: -------------------------------------------------------------------------- Net Dividend Affiliate Activity Income -------------------------------------------------------------------------- Merrill Lynch Institutional Tax-Exempt Fund (3,101) $71 -------------------------------------------------------------------------- (n) Represents a zero coupon bond; the interest rate shown reflects the effective yield at the time of purchase. (o) Represents the current yield as of April 30, 2007. (p) FHLMC Collateralized. o Forward interest rate swaps outstanding as of April 30, 2007 were as follows: -------------------------------------------------------------------------- Notional Unrealized Amount Depreciation -------------------------------------------------------------------------- Pay a fixed rate of 3.753% and receive a floating rate based on 1-Week Bond Market Association rate Broker, JPMorgan Chase Expires May 2017 $30,500 $(242) Pay a fixed rate of 3.686% and receive a floating rate based on 1-Week Bond Market Association rate Broker, JPMorgan Chase Expires August 2017 $22,500 (40) -------------------------------------------------------------------------- Total $(282) ===== See Notes to Financial Statements. 32 SEMI-ANNUAL REPORTS APRIL 30, 2007 Statements of Net Assets BlackRock BlackRock BlackRock BlackRock MuniYield MuniYield MuniYield MuniYield Insured Quality Quality As of April 30, 2007 (Unaudited) Fund, Inc. Fund, Inc. Fund, Inc. Fund II, Inc. =================================================================================================================================== Assets ----------------------------------------------------------------------------------------------------------------------------------- Investments in unaffiliated securities, at value* ..... $1,033,355,561 $1,808,157,766 $ 786,868,185 $ 510,485,718 Investments in affiliated securities, at value** ...... 814,176 -- 3,014,519 2,814,342 Cash .................................................. 105 52,141 79,932 76,426 Interest receivable ................................... 16,929,218 25,199,667 11,223,973 7,003,955 Receivable for securities sold ........................ 10,977,814 10,753,200 4,471,336 1,850,925 Unrealized appreciation on forward interest rate swaps -- 163,965 -- -- Prepaid expenses and other assets ..................... 22,570 32,431 51,416 22,203 -------------------------------------------------------------- Total assets .......................................... 1,062,099,444 1,844,359,170 805,709,361 522,253,569 -------------------------------------------------------------- =================================================================================================================================== Liabilities ----------------------------------------------------------------------------------------------------------------------------------- Trust certificates .................................... 36,112,500 182,665,000 79,897,914 50,510,000 Collateral for swaps .................................. 600,000 -- -- -- Unrealized depreciation on forward interest rate swaps -- 4,680,475 596,240 282,445 Interest expense payable .............................. 509,441 2,217,211 1,006,433 642,198 Payable for securities purchased ...................... 7,620,146 55,178,440 8,923,635 6,086,931 Payable to investment adviser ......................... 414,545 653,579 291,747 189,258 Payable for swaps ..................................... -- -- -- 17,549 Dividends payable to Common Stock shareholders ........ 3,060,195 3,768,975 1,734,240 1,118,347 Payable to other affiliates ........................... 11,410 17,808 8,050 5,229 Accrued expenses and other liabilities ................ 251,702 313,199 180,979 144,321 -------------------------------------------------------------- Total liabilities ..................................... 48,579,939 249,494,687 92,639,238 58,996,278 -------------------------------------------------------------- =================================================================================================================================== Preferred Stock ----------------------------------------------------------------------------------------------------------------------------------- Preferred Stock, at redemption value, par value $.05 and $.10 per share*** of AMPS@ at $25,000 per share liquidation preference .............................. 343,363,012 570,560,184 250,155,596 160,131,903 -------------------------------------------------------------- =================================================================================================================================== Net Assets Applicable to Common Stock ----------------------------------------------------------------------------------------------------------------------------------- Net assets applicable to Common Stock ................. $ 670,156,493 $1,024,304,299 $ 462,914,527 $ 303,125,388 ============================================================== SEMI-ANNUAL REPORTS APRIL 30, 2007 33 Statements of Net Assets (concluded) BlackRock BlackRock BlackRock BlackRock MuniYield MuniYield MuniYield MuniYield Insured Quality Quality As of April 30, 2007 (Unaudited) Fund, Inc. Fund, Inc. Fund, Inc. Fund II, Inc. =================================================================================================================================== Net Assets Consist of ----------------------------------------------------------------------------------------------------------------------------------- Undistributed investment income -- net ................ $ 4,013,309 $ 4,857,326 $ 912,488 $ 816,138 Undistributed (accumulated) realized capital gains (losses) -- net ..................................... (36,714,810) 2,705,693 905,671 (34,065,139) Unrealized appreciation -- net ........................ 57,755,556 72,761,059 34,836,808 22,561,969 -------------------------------------------------------------- Total accumulated earnings (losses) -- net ............ 25,054,055 80,324,078 36,654,967 (10,687,032) Common Stock, par value $.10 per share+ ............... 4,500,287 6,730,313 3,042,526 2,236,693 Paid-in capital in excess of par ...................... 640,602,151 937,249,908 423,217,034 311,575,727 -------------------------------------------------------------- Net assets applicable to Common Stock ................. $ 670,156,493 $1,024,304,299 $ 462,914,527 $ 303,125,388 ============================================================== Net asset value per share of Common Stock ............. $ 14.89 $ 15.22 $ 15.21 $ 13.55 ============================================================== Market price .......................................... $ 15.71 $ 14.33 $ 14.39 $ 12.67 ============================================================== * Identified cost on unaffiliated securities ........ $ 975,600,005 $1,730,880,197 $ 751,435,137 $ 487,641,304 ============================================================== ** Identified cost on affiliated securities .......... $ 814,176 -- $ 3,014,519 $ 2,814,342 ============================================================== *** Preferred Stock authorized, issued and outstanding: Series A Shares, $.05 per share ................. 1,800 -- 2,000 2,000 ============================================================== Series A Shares, $.10 per share ................. -- 2,200 -- -- ============================================================== Series B Shares, $.05 per share ................. 1,800 -- 2,000 2,000 ============================================================== Series B Shares, $.10 per share ................. -- 2,200 -- -- ============================================================== Series C Shares, $.05 per share ................. 1,800 -- 2,000 2,000 ============================================================== Series C Shares, $.10 per share ................. -- 2,200 -- -- ============================================================== Series D Shares, $.05 per share ................. 1,800 -- 2,000 -- ============================================================== Series D Shares, $.10 per share ................. -- 2,200 -- 400 ============================================================== Series E Shares, $.05 per share ................. 2,800 -- 2,000 -- ============================================================== Series E Shares, $.10 per share ................. -- 4,000 -- -- ============================================================== Series F Shares, $.05 per share ................. 1,720 -- -- -- ============================================================== Series F Shares, $.10 per share ................. -- 2,400 -- -- ============================================================== Series G Shares, $.05 per share ................. 2,000 -- -- -- ============================================================== Series G Shares, $.10 per share ................. -- 2,400 -- -- ============================================================== Series H Shares, $.10 per share ................. -- 2,600 -- -- ============================================================== Series I Shares, $.10 per share ................. -- 2,600 -- -- ============================================================== + Common Stock issued and outstanding ............... 45,002,872 67,303,125 30,425,258 22,366,930 ============================================================== @ Auction Market Preferred Stock. See Notes to Financial Statements. 34 SEMI-ANNUAL REPORTS APRIL 30, 2007 Statements of Operations BlackRock BlackRock BlackRock BlackRock MuniYield MuniYield MuniYield MuniYield Insured Quality Quality For the Six Months Ended April 30, 2007 (Unaudited) Fund, Inc. Fund, Inc. Fund, Inc. Fund II, Inc. =================================================================================================================================== Investment Income ----------------------------------------------------------------------------------------------------------------------------------- Interest .............................................. $ 26,486,056 $ 40,663,174 $ 17,917,343 $ 11,621,728 Dividends from affiliates ............................. 119,563 71,331 86,665 70,642 -------------------------------------------------------------- Total income .......................................... 26,605,619 40,734,505 18,004,008 11,692,370 -------------------------------------------------------------- =================================================================================================================================== Expenses ----------------------------------------------------------------------------------------------------------------------------------- Investment advisory fees .............................. 2,517,300 3,966,607 1,773,230 1,152,049 Interest expense and fees ............................. 732,215 3,431,442 1,582,872 987,125 Commission fees ....................................... 442,287 710,665 315,638 204,957 Accounting services ................................... 139,579 184,211 110,922 78,619 Transfer agent fees ................................... 61,574 82,379 45,762 35,655 Professional fees ..................................... 42,040 35,185 28,919 26,425 Custodian fees ........................................ 23,460 39,268 18,905 12,527 Printing and shareholder reports ...................... 24,094 38,307 17,585 11,829 Pricing fees .......................................... 17,286 17,653 12,771 10,546 Directors' fees and expenses .......................... 18,606 25,578 14,725 11,602 Listing fees .......................................... 8,242 11,528 5,291 4,663 Other ................................................. 45,271 56,079 36,809 23,687 -------------------------------------------------------------- Total expenses before reimbursement ................... 4,071,954 8,598,902 3,963,429 2,559,684 Reimbursement of expenses ............................. (7,025) (3,459) (4,980) (4,063) -------------------------------------------------------------- Total expenses after reimbursement .................... 4,064,929 8,595,443 3,958,449 2,555,621 -------------------------------------------------------------- Investment income -- net .............................. 22,540,690 32,139,062 14,045,559 9,136,749 -------------------------------------------------------------- =================================================================================================================================== Realized & Unrealized Gain (Loss) -- Net ----------------------------------------------------------------------------------------------------------------------------------- Realized gain (loss) on: Investments -- net ................................ 3,662,213 8,831,953 1,757,296 1,063,193 Forward interest rate swaps -- net ................ 353,000 4,401,228 607,454 (1,179,452) -------------------------------------------------------------- Total realized and unrealized gain (loss) -- net ...... 4,015,213 13,233,181 2,364,750 (116,259) -------------------------------------------------------------- Change in unrealized appreciation/depreciation on: Investments -- net ................................ (6,114,916) (13,570,745) (3,944,118) (2,328,194) Forward interest rate swaps -- net ................ -- (4,744,322) (585,405) 1,018,151 -------------------------------------------------------------- Total change in unrealized appreciation/depreciation -- net .................... (6,114,916) (18,315,067) (4,529,523) (1,310,043) -------------------------------------------------------------- Total realized and unrealized loss -- net ............. (2,099,703) (5,081,886) (2,164,773) (1,426,302) -------------------------------------------------------------- =================================================================================================================================== Dividends to Preferred Stock Shareholders ----------------------------------------------------------------------------------------------------------------------------------- Investment income -- net .............................. (5,979,290) (10,052,224) (4,441,346) (2,851,952) -------------------------------------------------------------- Total dividends to Preferred Stock shareholders ....... (5,979,290) (10,052,224) (4,441,346) (2,851,952) -------------------------------------------------------------- Net Increase in Net Assets Resulting from Operations .. $ 14,461,697 $ 17,004,952 $ 7,439,440 $ 4,858,495 ============================================================== See Notes to Financial Statements. SEMI-ANNUAL REPORTS APRIL 30, 2007 35 Statements of Changes in Net Assets BlackRock MuniYield Fund, Inc. For the Six Months Ended For the April 30, Year Ended 2007 October 31, Increase (Decrease) in Net Assets: (Unaudited) 2006 ========================================================================================================================== Operations -------------------------------------------------------------------------------------------------------------------------- Investment income -- net ................................................... $ 22,540,690 $ 48,122,220 Realized gain -- net ....................................................... 4,015,213 11,351,444 Change in unrealized appreciation -- net ................................... (6,114,916) 16,345,769 Dividends to Preferred Stock shareholders .................................. (5,979,290) (11,212,348) -------------------------------- Net increase in net assets resulting from operations ....................... 14,461,697 64,607,085 -------------------------------- ========================================================================================================================== Dividends and Distributions to Common Stock Shareholders -------------------------------------------------------------------------------------------------------------------------- Investment income -- net ................................................... (18,648,645) (42,053,117) Realized gain -- net ....................................................... -- (137,799) -------------------------------- Net decrease in net assets resulting from dividends and distributions to Common Stock shareholders ................................................ (18,648,645) (42,190,916) -------------------------------- ========================================================================================================================== Stock Transactions -------------------------------------------------------------------------------------------------------------------------- Value of shares issued to Common Stock shareholders in reinvestment of dividends ................................................................ 1,976,579 5,095,713 Adjustment of offering costs resulting from the issuance of Preferred Stock -- 30,397 -------------------------------- Net increase in net assets derived from stock transactions ................. 1,976,579 5,126,110 -------------------------------- ========================================================================================================================== Net Assets Applicable to Common Stock -------------------------------------------------------------------------------------------------------------------------- Total increase (decrease) in net assets applicable to Common Stock ......... (2,210,369) 27,542,279 Beginning of period ........................................................ 672,366,862 644,824,583 -------------------------------- End of period* ............................................................. $ 670,156,493 $ 672,366,862 ================================ * Undistributed investment income -- net ............................... $ 4,013,309 $ 6,100,554 ================================ See Notes to Financial Statements. 36 SEMI-ANNUAL REPORTS APRIL 30, 2007 Statements of Changes in Net Assets BlackRock MuniYield Insured Fund, Inc. For the Six Months Ended For the April 30, Year Ended 2007 October 31, Increase (Decrease) in Net Assets: (Unaudited) 2006 ========================================================================================================================== Operations -------------------------------------------------------------------------------------------------------------------------- Investment income -- net ................................................... $ 32,139,062 $ 65,901,797 Realized gain (loss) -- net ................................................ 13,233,181 (894,104) Change in unrealized appreciation/depreciation -- net ...................... (18,315,067) 32,084,422 Dividends and distributions to Preferred Stock shareholders ................ (10,052,224) (19,896,916) -------------------------------- Net increase in net assets resulting from operations ....................... 17,004,952 77,195,199 -------------------------------- ========================================================================================================================== Dividends and Distributions to Common Stock Shareholders -------------------------------------------------------------------------------------------------------------------------- Investment income -- net ................................................... (22,748,456) (52,496,438) Realized gain -- net ....................................................... -- (22,672,673) -------------------------------- Net decrease in net assets resulting from dividends and distributions to Common Stock shareholders ................................................ (22,748,456) (75,169,111) -------------------------------- ========================================================================================================================== Net Assets Applicable to Common Stock -------------------------------------------------------------------------------------------------------------------------- Total increase (decrease) in net assets applicable to Common Stock ......... (5,743,504) 2,026,088 Beginning of period ........................................................ 1,030,047,803 1,028,021,715 -------------------------------- End of period* ............................................................. $1,024,304,299 $1,030,047,803 ================================ * Undistributed investment income -- net ............................... $ 4,857,326 $ 5,518,944 ================================ See Notes to Financial Statements. SEMI-ANNUAL REPORTS APRIL 30, 2007 37 Statements of Changes in Net Assets BlackRock MuniYield Quality Fund, Inc. For the Six Months Ended For the April 30, Year Ended 2007 October 31, Increase (Decrease) in Net Assets: (Unaudited) 2006 ========================================================================================================================== Operations -------------------------------------------------------------------------------------------------------------------------- Investment income -- net ................................................... $ 14,045,559 $ 30,209,734 Realized gain -- net ....................................................... 2,364,750 3,133,924 Change in unrealized appreciation/depreciation -- net ...................... (4,529,523) 7,934,032 Dividends to Preferred Stock shareholders .................................. (4,441,346) (8,213,090) -------------------------------- Net increase in net assets resulting from operations ....................... 7,439,440 33,064,600 -------------------------------- ========================================================================================================================== Dividends to Common Stock Shareholders -------------------------------------------------------------------------------------------------------------------------- Investment income -- net ................................................... (10,527,139) (23,944,678) -------------------------------- Net decrease in net assets resulting from dividends to Common Stock shareholders ............................................................. (10,527,139) (23,944,678) -------------------------------- ========================================================================================================================== Stock Transactions -------------------------------------------------------------------------------------------------------------------------- Offering and underwriting costs, including adjustments, resulting from the issuance of Preferred Stock .............................................. -- (4,076) -------------------------------- Net decrease in net assets derived from Capital Stock transactions ......... -- (4,076) -------------------------------- ========================================================================================================================== Net Assets Applicable to Common Stock -------------------------------------------------------------------------------------------------------------------------- Total increase (decrease) in net assets applicable to Common Stock ......... (3,087,699) 9,115,846 Beginning of period ........................................................ 466,002,226 456,886,380 -------------------------------- End of period* ............................................................. $ 462,914,527 $ 466,002,226 ================================ * Undistributed investment income -- net ............................... $ 912,488 $ 1,835,414 ================================ See Notes to Financial Statements. 38 SEMI-ANNUAL REPORTS APRIL 30, 2007 Statements of Changes in Net Assets BlackRock MuniYield Quality Fund II, Inc. For the Six Months Ended For the April 30, Year Ended 2007 October 31, Increase (Decrease) in Net Assets: (Unaudited) 2006 ========================================================================================================================== Operations -------------------------------------------------------------------------------------------------------------------------- Investment income -- net ................................................... $ 9,136,749 $ 19,260,899 Realized gain (loss) -- net ................................................ (116,259) 3,512,017 Change in unrealized appreciation/depreciation -- net ...................... (1,310,043) 4,732,128 Dividends to Preferred Stock shareholders .................................. (2,851,952) (5,311,655) -------------------------------- Net increase in net assets resulting from operations ....................... 4,858,495 22,193,389 -------------------------------- ========================================================================================================================== Dividends to Common Stock Shareholders -------------------------------------------------------------------------------------------------------------------------- Investment income -- net ................................................... (6,844,280) (15,858,153) -------------------------------- Net decrease in net assets resulting from dividends to Common Stock shareholders ............................................................. (6,844,280) (15,858,153) -------------------------------- ========================================================================================================================== Stock Transactions -------------------------------------------------------------------------------------------------------------------------- Offering and underwriting costs, including adjustments, resulting from the issuance of Preferred Stock .............................................. -- 54,002 -------------------------------- Net increase (decrease) in net assets resulting from stock transactions .... -- 54,002 -------------------------------- ========================================================================================================================== Net Assets Applicable to Common Stock -------------------------------------------------------------------------------------------------------------------------- Total increase (decrease) in net assets applicable to Common Stock ......... (1,985,785) 6,389,238 Beginning of period ........................................................ 305,111,173 298,721,935 -------------------------------- End of period* ............................................................. $ 303,125,388 $ 305,111,173 ================================ * Undistributed investment income -- net ............................... $ 816,138 $ 1,375,621 ================================ See Notes to Financial Statements. SEMI-ANNUAL REPORTS APRIL 30, 2007 39 Statements of Cash Flows BlackRock BlackRock MuniYield MuniYield Quality Quality For the Six Months Ended April 30, 2007 (Unaudited) Fund, Inc. Fund II, Inc. ========================================================================================================================== Cash Provided by Operating Activities -------------------------------------------------------------------------------------------------------------------------- Net increase in net assets resulting from operations ....................... $ 7,439,440 $ 4,858,495 Adjustments to reconcile net increase in net assets resulting from operations to net cash provided by operating activities: Decrease in receivables ................................................ 383,438 194,981 Decrease in other assets and prepaid expenses .......................... 1,040 15,190 Increase (decrease) in other liabilities ............................... (1,362,373) 141,570 Increase in dividends payable to Preferred Stock shareholders .......... 22,146 7,068 Realized and unrealized gain (loss) on investments and forward interest rate swaps -- net ............................................................. 2,164,773 1,426,302 Realized gain (loss) on forward interest rate swaps ........................ 607,454 (1,179,452) Amortization of premium and discount ....................................... 551,181 (209,463) Proceeds from sales of long-term securities ................................ 53,687,717 43,155,924 Purchases of long-term securities .......................................... (58,163,978) (45,522,847) Net proceeds from sales of short-term investments .......................... 3,701,399 3,100,618 -------------------------------- Cash provided by operating activities ...................................... 9,032,237 5,988,386 -------------------------------- ========================================================================================================================== Cash Used for Financing Activities -------------------------------------------------------------------------------------------------------------------------- Dividends and distributions paid to Common Stock shareholders .............. (8,974,913) (5,927,134) -------------------------------- Cash used for financing activities ......................................... (8,974,913) (5,927,134) -------------------------------- ========================================================================================================================== Cash -------------------------------------------------------------------------------------------------------------------------- Net increase in cash ....................................................... 57,324 61,252 Cash at beginning of period ................................................ 22,608 15,174 -------------------------------- Cash at end of period ...................................................... $ 79,932 $ 76,426 ================================ ========================================================================================================================== Cash Flow Information -------------------------------------------------------------------------------------------------------------------------- Cash paid for interest ..................................................... $ 4,469,340 $ 3,841,762 ================================ Dividends and distributions paid to Preferred Stock shareholders ........... $ 2,953,859 $ 4,419,200 ================================ See Notes to Financial Statements. 40 SEMI-ANNUAL REPORTS APRIL 30, 2007 Financial Highlights BlackRock MuniYield Fund, Inc. For the Six The following per share data and ratios Months Ended For the Year Ended October 31, have been derived from information April 30, 2007 ---------------------------------------------------------------------- provided in the financial statements. (Unaudited) 2006 2005 2004 2003 2002 ================================================================================================================================== Per Share Operating Performance ---------------------------------------------------------------------------------------------------------------------------------- Net asset value, beginning of period .. $ 14.98 $ 14.48 $ 14.31 $ 13.85 $ 13.28 $ 13.55 ---------------------------------------------------------------------------------------- Investment income -- net .............. .50+ 1.08+ 1.11+ 1.09+ 1.06+ 1.04 Realized and unrealized gain (loss) -- net ....................... (.04) .61 .21 .41 .52 (.31) Dividends and distributions to Preferred Stock shareholders: Investment income -- net .......... (.13) (.25) (.16) (.07) (.07) (.08) Realized gain -- net .............. -- --++ -- -- -- -- ---------------------------------------------------------------------------------------- Total from investment operations ...... .33 1.44 1.16 1.43 1.51 .65 ---------------------------------------------------------------------------------------- Less dividends and distributions to Common Stock shareholders: Investment income -- net .......... (.42) (.94) (.99) (.96) (.94) (.92) Realized gain -- net .............. -- --++ -- -- -- -- ---------------------------------------------------------------------------------------- Total dividends and distributions to Common Stock shareholders ........... (.42) (.94) (.99) (.96) (.94) (.92) ---------------------------------------------------------------------------------------- Offering and underwriting costs, including adjustments, resulting from issuance of Preferred Stock ......... -- --@ --++ (.01) -- -- ---------------------------------------------------------------------------------------- Net asset value, end of period ........ $ 14.89 $ 14.98 $ 14.48 $ 14.31 $ 13.85 $ 13.28 ======================================================================================== Market price per share, end of period . $ 15.71 $ 15.76 $ 14.20 $ 13.74 $ 13.29 $ 12.88 ======================================================================================== ================================================================================================================================== Total Investment Return* ---------------------------------------------------------------------------------------------------------------------------------- Based on net asset value per share .... 2.19%@@@ 10.30% 8.38% 11.04% 11.99% 5.07% ======================================================================================== Based on market price per share ....... 2.48%@@@ 18.33% 10.69% 11.11% 10.80% (.94%) ======================================================================================== ================================================================================================================================== Ratios Based on Average Net Assets Applicable to Common Stock ---------------------------------------------------------------------------------------------------------------------------------- Total expenses, net of reimbursement and excluding interest expense and fees** .............................. 1.00%@@ 1.01% 1.02% .97% .99% 1.01% ======================================================================================== Total expenses, net of reimbursement** 1.22%@@ 1.29% 1.26% 1.13% 1.14% 1.24% ======================================================================================== Total expenses** ...................... 1.22%@@ 1.29% 1.26% 1.14% 1.14% 1.24% ======================================================================================== Total investment income -- net** ...... 6.76%@@ 7.35% 7.55% 7.75% 7.86% 7.97% ======================================================================================== Amount of dividends to Preferred Stock shareholders ........................ 1.79%@@ 1.71% 1.10% .51% .50% .74% ======================================================================================== Investment income -- net, to Common Stock shareholders .................. 4.97%@@ 5.64% 6.45% 7.24% 7.36% 7.23% ======================================================================================== ================================================================================================================================== Ratios Based on Average Net Assets Applicable to Preferred Stock ---------------------------------------------------------------------------------------------------------------------------------- Dividends to Preferred Stock shareholders ........................ 3.52%@@ 3.26% 2.09% 1.05% 1.02% 1.50% ======================================================================================== ================================================================================================================================== Supplemental Data ---------------------------------------------------------------------------------------------------------------------------------- Net assets applicable to Common Stock, end of period (in thousands) ........ $ 670,156 $ 672,367 $ 644,825 $ 636,019 $ 615,169 $ 590,101 ======================================================================================== Preferred Stock outstanding at liquidation preference, end of period (in thousands) ...................... 343,000 $ 343,000 $ 343,000 $ 343,000 $ 293,000 $ 293,000 ======================================================================================== Portfolio turnover .................... 10% 32% 30% 22% 56% 94% ======================================================================================== ================================================================================================================================== Leverage ---------------------------------------------------------------------------------------------------------------------------------- Asset coverage per $1,000 ............. $ 2,954 $ 2,960 $ 2,880 $ 2,854 $ 3,100 $ 3,014 ======================================================================================== ================================================================================================================================== Dividends Per Share on Preferred Stock Outstanding ---------------------------------------------------------------------------------------------------------------------------------- Series A -- Investment income -- net .. $ 433 $ 819 $ 524 $ 266 $ 256 $ 346 ======================================================================================== Series B -- Investment income -- net .. $ 452 $ 809 $ 549 $ 268 $ 274 $ 369 ======================================================================================== Series C -- Investment income -- net .. $ 427 $ 846 $ 531 $ 268 $ 261 $ 353 ======================================================================================== Series D -- Investment income -- net .. $ 422 $ 826 $ 509 $ 260 $ 281 $ 504 ======================================================================================== Series E -- Investment income -- net .. $ 440 $ 803 $ 522 $ 244 $ 236 $ 346 ======================================================================================== Series F -- Investment income -- net .. $ 438 $ 806 $ 494 $ 253 $ 247 $ 324 ======================================================================================== Series G+++ -- Investment income -- net $ 436 $ 807 $ 533 $ 60 -- -- ======================================================================================== * Total investment returns based on market value, which can be significantly greater or lesser than the net asset value, may result in substantially different returns. Total investment returns exclude the effects of sales charges. ** Do not reflect the effect of dividends to Preferred Stock shareholders. + Based on average shares outstanding. ++ Amount is less than $(.01) per share. +++ Series G was issued on August 31, 2004. @ Amount is less than $.01 per share. @@ Annualized. @@@ Aggregate total investment return. See Notes to Financial Statements. SEMI-ANNUAL REPORTS APRIL 30, 2007 41 Financial Highlights BlackRock MuniYield Insured Fund, Inc. For the Six The following per share data and ratios Months Ended For the Year Ended October 31, have been derived from information April 30, 2007 ---------------------------------------------------------------------- provided in the financial statements. (Unaudited) 2006 2005 2004 2003 2002 ================================================================================================================================== Per Share Operating Performance ---------------------------------------------------------------------------------------------------------------------------------- Net asset value, beginning of period .. $ 15.30 $ 15.27 $ 15.59 $ 15.36 $ 15.15 $ 15.18 ---------------------------------------------------------------------------------------- Investment income -- net .............. .48@ .98@ 1.04@ 1.04@ 1.08@ 1.07 Realized and unrealized gain (loss) -- net ....................... (.07) .46 (.22) .25 .16 (.04) Dividends and distributions to Preferred Stock shareholders: Investment income -- net .......... (.15) (.25) (.16) (.07) (.08) (.11) Realized gain -- net .............. -- (.04) (.02) -- -- --+ ---------------------------------------------------------------------------------------- Total from investment operations ...... .26 1.15 .64 1.22 1.16 .92 ---------------------------------------------------------------------------------------- Less dividends and distributions to Common Stock shareholders: Investment income -- net .......... (.34) (.78) (.95) (.97) (.95) (.95) Realized gain -- net .............. -- (.34) (.01) -- -- --+ ---------------------------------------------------------------------------------------- Total dividends, including adjustments, and distributions to Common Stock shareholders ........................ (.34) (1.12) (.96) (.97) (.95) (.95) ---------------------------------------------------------------------------------------- Offering and underwriting costs resulting from issuance of Preferred Stock ............................... -- -- --++ (.02) -- -- ---------------------------------------------------------------------------------------- Net asset value, end of period ........ $ 15.22 $ 15.30 $ 15.27 $ 15.59 $ 15.36 $ 15.15 ======================================================================================== Market price per share, end of period . $ 14.33 $ 14.36 $ 14.70 $ 14.57 $ 14.51 $ 14.31 ======================================================================================== ================================================================================================================================== Total Investment Return* ---------------------------------------------------------------------------------------------------------------------------------- Based on net asset value per share .... 1.85%+++ 8.09% 4.54% 8.52% 8.18% 6.52% ======================================================================================== Based on market price per share ....... 2.17%+++ 5.38% 7.69% 7.36% 8.19% 1.42% ======================================================================================== ================================================================================================================================== Ratios Based on Average Net Assets Applicable to Common Stock ---------------------------------------------------------------------------------------------------------------------------------- Total expenses, net of reimbursement and excluding interest expense and fees** .............................. 1.01%@@@ 1.02% 1.01% .95% .94% .97% ======================================================================================== Total expenses, net of reimbursement** 1.68%@@@ 1.67% 1.60% 1.19% 1.18% 1.23% ======================================================================================== Total expenses** ...................... 1.68%@@@ 1.67% 1.60% 1.19% 1.18% 1.24% ======================================================================================== Total investment income -- net** ...... 6.29%@@@ 6.52% 6.62% 6.77% 6.99% 7.16% ======================================================================================== Amount of dividends to Preferred Stock shareholders ........................ 1.97%@@@ 1.67% 1.05% .51% .49% .73% ======================================================================================== Investment income -- net, to Common Stock shareholders .................. 4.32%@@@ 4.85% 5.57% 6.26% 6.50% 6.43% ======================================================================================== ================================================================================================================================== Ratios Based on Average Net Assets Applicable to Preferred Stock ---------------------------------------------------------------------------------------------------------------------------------- Dividends to Preferred Stock shareholders ........................ 3.56%@@@ 2.96% 1.94% 1.08% 1.06% 1.53% ======================================================================================== ================================================================================================================================== Supplemental Data ---------------------------------------------------------------------------------------------------------------------------------- Net assets applicable to Common Stock, end of period (in thousands) ........ $1,024,304 $1,030,048 $1,028,022 $1,049,423 $ 953,662 $ 940,852 ======================================================================================== Preferred Stock outstanding at liquidation preference, end of period (in thousands) ...................... $ 570,000 $ 570,000 $ 570,000 $ 570,000 $ 440,000 $ 440,000 ======================================================================================== Portfolio turnover .................... 43% 95% 105% 122% 95% 82% ======================================================================================== ================================================================================================================================== Leverage ---------------------------------------------------------------------------------------------------------------------------------- Asset coverage per $1,000 ............. $ 2,797 $ 2,807 $ 2,804 $ 2,841 $ 3,167 $ 3,138 ======================================================================================== ================================================================================================================================== Dividends Per Share on Preferred Stock Outstanding ---------------------------------------------------------------------------------------------------------------------------------- Series A -- Investment income -- net .. $ 433 $ 763 $ 478 $ 272 $ 270 $ 364 ======================================================================================== Series B -- Investment income -- net .. $ 447 $ 750 $ 481 $ 283 $ 273 $ 364 ======================================================================================== Series C -- Investment income -- net .. $ 451 $ 744 $ 502 $ 251 $ 268 $ 360 ======================================================================================== Series D -- Investment income -- net .. $ 433 $ 779 $ 474 $ 264 $ 247 $ 348 ======================================================================================== Series E -- Investment income -- net .. $ 435 $ 729 $ 471 $ 259 $ 240 $ 352 ======================================================================================== Series F -- Investment income -- net .. $ 450 $ 766 $ 481 $ 271 $ 274 $ 359 ======================================================================================== Series G -- Investment income -- net .. $ 441 $ 714 $ 487 $ 269 $ 304 $ 545 ======================================================================================== Series H@@ -- Investment income -- net $ 441 $ 725 $ 493 $ 63 -- -- ======================================================================================== Series I@@ -- Investment income -- net $ 440 $ 718 $ 498 $ 65 -- -- ======================================================================================== * Total investment returns based on market value, which can be significantly greater or lesser than the net asset value, may result in substantially different returns. Total investment returns exclude the effects of sales charges. ** Do not reflect the effect of dividends to Preferred Stock shareholders. + Amount is less than $(.01) per share. ++ Amount is less than $.01 per share. +++ Aggregate total investment return. @ Based on average shares outstanding. @@ Series H and Series I were issued on August 23, 2004. @@@ Annualized. See Notes to Financial Statements. 42 SEMI-ANNUAL REPORTS APRIL 30, 2007 Financial Highlights BlackRock MuniYield Quality Fund, Inc. For the Six The following per share data and ratios Months Ended For the Year Ended October 31, have been derived from information April 30, 2007 ---------------------------------------------------------------------- provided in the financial statements. (Unaudited) 2006 2005 2004 2003 2002 ================================================================================================================================== Per Share Operating Performance ---------------------------------------------------------------------------------------------------------------------------------- Net asset value, beginning of period .. $ 15.32 $ 15.02 $ 15.54 $ 15.36 $ 15.19 $ 15.27 ---------------------------------------------------------------------------------------- Investment income -- net .............. .46+ .99+ .99+ 1.03+ 1.07+ 1.06 Realized and unrealized gain (loss) -- net ....................... (.07) .37 (.39) .19 .13 (.13) Dividends and distributions to Preferred Stock shareholders: Investment income -- net .......... (.15) (.27) (.14) (.07) (.07) (.09) Realized gain -- net .............. -- -- -- -- -- --@ ---------------------------------------------------------------------------------------- Total from investment operations ...... .24 1.09 .46 1.15 1.13 .84 ---------------------------------------------------------------------------------------- Less dividends and distributions to Common Stock shareholders: Investment income -- net .......... (.35) (.79) (.96) (.97) (.96) (.91) Realized gain -- net .............. -- -- -- -- -- (.01) ---------------------------------------------------------------------------------------- Total dividends and distributions to Common Stock shareholders ........... (.35) (.79) (.96) (.97) (.96) (.92) ---------------------------------------------------------------------------------------- Offering and underwriting costs, including adjustments, resulting from the issuance of Preferred Stock ..... -- --@ (.02) -- -- -- ---------------------------------------------------------------------------------------- Net asset value, end of period ........ $ 15.21 $ 15.32 $ 15.02 $ 15.54 $ 15.36 $ 15.19 ======================================================================================== Market price per share, end of period . $ 14.39 $ 14.48 $ 14.27 $ 14.83 $ 14.35 $ 13.74 ======================================================================================== ================================================================================================================================== Total Investment Return* ---------------------------------------------------------------------------------------------------------------------------------- Based on net asset value per share .... 1.69%@@@ 7.78% 3.10% 8.26% 8.13% 6.12% ======================================================================================== Based on market price per share ....... 1.79%@@@ 7.22% 2.64% 10.58% 11.68% 2.94% ======================================================================================== ================================================================================================================================== Ratios Based on Average Net Assets Applicable to Common Stock ---------------------------------------------------------------------------------------------------------------------------------- Total expenses, net of reimbursement and excluding interest expenses and fees** .............................. 1.03%@@ 1.04% .96% .94% .94% .96% ======================================================================================== Total expenses, net of reimbursement** 1.72%@@ 1.75% .96% .94% .94% .96% ======================================================================================== Total expenses** ...................... 1.72%@@ 1.76% .96% .95% .95% .96% ======================================================================================== Total investment income -- net** ...... 6.09%@@ 6.61% 6.46% 6.74% 6.89% 7.03% ======================================================================================== Amount of dividends to Preferred Stock shareholders ........................ 1.93%@@ 1.80% .93% .45% .42% .61% ======================================================================================== Investment income -- net, to Common Stock shareholders .................. 4.16%@@ 4.81% 5.53% 6.29% 6.47% 6.42% ======================================================================================== ================================================================================================================================== Ratios Based on Average Net Assets Applicable to Preferred Stock ---------------------------------------------------------------------------------------------------------------------------------- Dividends to Preferred Stock shareholders ........................ 3.58%@@ 3.29% 2.12% 1.04% .99% 1.40% ======================================================================================== ================================================================================================================================== Supplemental Data ---------------------------------------------------------------------------------------------------------------------------------- Net assets applicable to Common Stock, end of period (in thousands) ........ $ 462,915 $ 466,002 $ 456,886 $ 472,848 $ 467,370 $ 462,156 ======================================================================================== Preferred Stock outstanding at liquidation preference, end of period (in thousands) ...................... $ 250,000 $ 250,000 $ 250,000 $ 200,000 $ 200,000 $ 200,000 ======================================================================================== Portfolio turnover .................... 7% 33% 29% 28% 30% 37% ======================================================================================== ================================================================================================================================== Leverage ---------------------------------------------------------------------------------------------------------------------------------- Asset coverage per $1,000 ............. $ 2,852 $ 2,864 $ 2,828 $ 3,364 $ 3,337 $ 3,311 ======================================================================================== ================================================================================================================================== Dividends Per Share on Preferred Stock Outstanding ---------------------------------------------------------------------------------------------------------------------------------- Series A -- Investment income -- net .. $ 455 $ 830 $ 540 $ 271 $ 273 $ 370 ======================================================================================== Series B -- Investment income -- net .. $ 441 $ 810 $ 520 $ 255 $ 238 $ 337 ======================================================================================== Series C -- Investment income -- net .. $ 438 $ 844 $ 536 $ 261 $ 253 $ 349 ======================================================================================== Series D -- Investment income -- net .. $ 447 $ 815 $ 514 $ 251 $ 228 $ 339 ======================================================================================== Series E ++ -- Investment income -- net $ 440 $ 808 $ 72 -- -- -- ======================================================================================== * Total investment returns based on market value, which can be significantly greater or lesser than the net asset value, may result in substantially different returns. Total investment returns exclude the effects of sales charges. ** Do not reflect the effect of dividends to Preferred Stock shareholders. + Based on average shares outstanding. ++ Series E was issued on September 21, 2005. @ Amount is less than $(.01) per share. @@ Annualized. @@@ Aggregate total investment return. See Notes to Financial Statements. SEMI-ANNUAL REPORTS APRIL 30, 2007 43 Financial Highlights BlackRock MuniYield Quality Fund II, Inc. For the Six The following per share data and ratios Months Ended For the Year Ended October 31, have been derived from information April 30, 2007 ---------------------------------------------------------------------- provided in the financial statements. (Unaudited) 2006 2005 2004 2003 2002 ================================================================================================================================== Per Share Operating Performance ---------------------------------------------------------------------------------------------------------------------------------- Net asset value, beginning of period .. $ 13.64 $ 13.36 $ 13.72 $ 13.44 $ 13.27 $ 13.21 ---------------------------------------------------------------------------------------- Investment income -- net .............. .41+ .86+ .89+ .94+ .97+ .94 Realized and unrealized gain (loss) -- net ....................... (.06) .37 (.25) .27 .09 --++ Dividends to Preferred Stock shareholders from investment income -- net ....................... (.13) (.24) (.14) (.07) (.07) (.10) ---------------------------------------------------------------------------------------- Total from investment operations ...... .22 .99 .50 1.14 .99 .84 ---------------------------------------------------------------------------------------- Less dividends to Common Stock shareholders from investment income -- net ....................... (.31) (.71) (.85) (.86) (.82) (.78) ---------------------------------------------------------------------------------------- Offering and underwriting costs, including adjustments, resulting from the issuance of Preferred Stock ..... -- --++ (.01) -- -- -- ---------------------------------------------------------------------------------------- Net asset value, end of period ........ $ 13.55 $ 13.64 $ 13.36 $ 13.72 $ 13.44 $ 13.27 ======================================================================================== Market price per share, end of period . $ 12.67 $ 12.93 $ 12.86 $ 12.69 $ 12.18 $ 11.75 ======================================================================================== ================================================================================================================================== Total Investment Return** ---------------------------------------------------------------------------------------------------------------------------------- Based on net asset value per share .... 1.76%@ 7.98% 3.98% 9.32% 8.28% 7.27% ======================================================================================== Based on market price per share ....... .37%@ 6.34% 8.21% 11.57% 10.83% 3.95% ======================================================================================== ================================================================================================================================== Ratios Based on Average Net Assets Applicable to Common Stock ---------------------------------------------------------------------------------------------------------------------------------- Total expenses, net of reimbursement and excluding interest expenses and fees*** ............................. 1.04%* 1.05% 1.03% 1.01% 1.03% 1.06% ======================================================================================== Total expenses, net of reimbursement*** 1.69%* 1.66% 1.49% 1.21% 1.30% 1.42% ======================================================================================== Total expenses*** ..................... 1.69%* 1.66% 1.49% 1.22% 1.31% 1.42% ======================================================================================== Total investment income -- net*** ..... 6.05%* 6.44% 6.51% 7.00% 7.17% 7.26% ======================================================================================== Amount of dividends to Preferred Stock shareholders ........................ 1.89%* 1.78% 1.03% .51% .50% .78% ======================================================================================== Investment income -- net, to Common Stock shareholders .................. 4.16%* 4.66% 5.48% 6.49% 6.67% 6.48% ======================================================================================== ================================================================================================================================== Ratios Based on Average Net Assets Applicable to Preferred Stock ---------------------------------------------------------------------------------------------------------------------------------- Dividends to Preferred Stock shareholders ........................ 3.59%* 3.32% 2.08% 1.04% 1.00% 1.51% ======================================================================================== ================================================================================================================================== Supplemental Data ---------------------------------------------------------------------------------------------------------------------------------- Net assets applicable to Common Stock, end of period (in thousands) ........ $ 303,125 $ 305,111 $ 298,722 $ 306,764 $ 300,502 $ 296,847 ======================================================================================== Preferred Stock outstanding at liquidation preference, end of period (in thousands) ...................... $ 160,000 $ 160,000 $ 160,000 $ 150,000 $ 150,000 $ 150,000 ======================================================================================== Portfolio turnover .................... 9% 37% 29% 27% 35% 34% ======================================================================================== ================================================================================================================================== Leverage ---------------------------------------------------------------------------------------------------------------------------------- Asset coverage per $1,000 ............. $ 2,895 $ 2,907 $ 2,867 $ 3,045 $ 3,003 $ 2,979 ======================================================================================== ================================================================================================================================== Dividends Per Share on Preferred Stock Outstanding ---------------------------------------------------------------------------------------------------------------------------------- Series A -- Investment income -- net .. $ 451 $ 832 $ 536 $ 271 $ 276 $ 390 ======================================================================================== Series B -- Investment income -- net .. $ 446 $ 860 $ 514 $ 253 $ 240 $ 388 ======================================================================================== Series C -- Investment income -- net .. $ 440 $ 803 $ 510 $ 252 $ 235 $ 351 ======================================================================================== Series D+++ -- Investment income -- net $ 442 $ 804 $ 71 -- -- -- ======================================================================================== * Annualized. ** Total investment returns based on market value, which can be significantly greater or lesser than the net asset value, may result in substantially different returns. Total investment returns exclude the effects of sales charges. *** Do not reflect the effect of dividends to Preferred Stock shareholders. + Based on average shares outstanding. ++ Amount is less than $.01 per share. +++ Series D was issued on September 21, 2005. @ Aggregate total investment return. See Notes to Financial Statements. 44 SEMI-ANNUAL REPORTS APRIL 30, 2007 Notes to Financial Statements (Unaudited) 1. Significant Accounting Policies: BlackRock MuniYield Fund, Inc., BlackRock MuniYield Insured Fund, Inc., BlackRock MuniYield Quality Fund, Inc. and BlackRock MuniYield Quality Fund II, Inc. (the "Funds" or individually as the "Fund"), are registered under the Investment Company Act of 1940, as amended, as non-diversified, closed-end management investment companies. The Funds' financial statements are prepared in conformity with U.S. generally accepted accounting principles, which may require the use of management accruals and estimates. Actual results may differ from these estimates. These unaudited financial statements reflect all adjustments, which are, in the opinion of management, necessary to present a fair statement of the results for the interim period. All such adjustments are of a normal, recurring nature. The Funds determine and make available for publication the net asset value of their Common Stock on a daily basis. The Funds' Common Stock shares are listed on the New York Stock Exchange under the symbol MYD for BlackRock MuniYield Fund, Inc., MYI for BlackRock MuniYield Insured Fund, Inc., MQY for BlackRock MuniYield Quality Fund, Inc. and MQT for BlackRock MuniYield Quality Fund II, Inc. The following is a summary of significant accounting policies followed by the Funds. (a) Valuation of investments -- Municipal bonds are traded primarily in the over-the-counter ("OTC") markets and are valued at the last available bid price in the OTC market or on the basis of values as obtained by a pricing service. Pricing services use valuation matrixes that incorporate both dealer-supplied valuations and valuation models. The procedures of the pricing service and its valuations are reviewed by the officers of each of the Funds under the general direction of the respective Board of Directors. Such valuations and procedures are reviewed periodically by the Boards of Directors of the Funds. Financial futures contracts and options thereon, which are traded on exchanges, are valued at their closing prices as of the close of such exchanges. Options written or purchased are valued at the last sale price in the case of exchange-traded options. Options traded in the OTC market are valued at the last asked price (options written) or the last bid price (options purchased). Swap agreements are valued by quoted fair values received daily by the Funds' pricing service. Short-term investments with a remaining maturity of 60 days or less are valued at amortized cost, which approximates market value, under which method the investment is valued at cost and any premium or discount is amortized on a straight line basis to maturity. Effective April 2, 2007, short-term securities purchased with a maturity of greater than 60 days may be valued at amortized cost. Investments in open-end investment companies are valued at their net asset value each business day. Securities and other assets for which market quotations are not readily available are valued at fair value as determined in good faith by or under the direction of each Fund's Board of Directors. (b) Derivative financial instruments -- Each Fund may engage in various portfolio investment strategies both to increase the return of the Fund and to hedge, or protect, its exposure to interest rate movements and movements in the securities markets. Losses may arise due to changes in the value of the contract due to an unfavorable change in the price of the underlying security or if the counterparty does not perform under the contract. The counterparty for certain instruments may pledge cash or securities as collateral. o Financial futures contracts -- Each Fund may purchase or sell financial futures contracts and options on such financial futures contracts. Financial futures contracts are contracts for delayed delivery of securities at a specific future date and at a specific price or yield. Upon entering into a contract, the Fund deposits and maintains as collateral such initial margin as required by the exchange on which the transaction is effected. Pursuant to the contract, the Fund agrees to receive from or pay to the broker an amount of cash equal to the daily fluctuation in value of the contract. Such receipts or payments are known as variation margin and are recorded by the Fund as unrealized gains or losses. When the contract is closed, the Fund records a realized gain or loss equal to the difference between the value of the contract at the time it was opened and the value at the time it was closed. o Options -- Each Fund may purchase and write call and put options. When the Fund writes an option, an amount equal to the premium received by the Fund is reflected as an asset and an equivalent liability. The amount of the liability is subsequently marked-to-market to reflect the current market value of the option written. When a security is purchased or sold through an exercise of an option, the related premium paid (or received) is added to (or deducted from) the basis of the security acquired or deducted from (or added to) the proceeds of the security sold. When an option expires (or the Fund enters into a closing transaction), the Fund realizes a gain or loss on the option to the extent of the premiums received or paid (or gain or loss to the extent the cost of the closing transaction exceeds the premium paid or received). Written and purchased options are non-income producing investments. SEMI-ANNUAL REPORTS APRIL 30, 2007 45 Notes to Financial Statements (continued) o Forward interest rate swaps -- Each Fund may enter into forward interest rate swaps. In a forward interest rate swap, the Fund and the counterparty agree to make periodic net payments on a specified notional contract amount, commencing on a specified future effective date, unless terminated earlier. When the agreement is closed, the Fund records a realized gain or loss in an amount equal to the value of the agreement. o Swaps -- Each Fund may enter into swap agreements, which are OTC contracts in which the Fund and a counterparty agree to make periodic net payments on a specified notional amount. The net payments can be made for a set period of time or may be triggered by a predetermined credit event. The net periodic payments may be based on a fixed or variable interest rate; the change in market value of a specified security, basket of securities, or index; or the return generated by a security. These periodic payments received or made by the Fund are recorded in the accompanying Statement of Operations as realized gains or losses, respectively. Gains or losses are also realized upon termination of the swap agreements. Swaps are marked-to-market daily and changes in value are recorded as unrealized appreciation (depreciation). Risks include changes in the returns of the underlying instruments, failure of the counterparties to perform under the contracts' terms and the possible lack of liquidity with respect to the swap agreements. (c) Municipal bonds held in trust -- Certain Funds invest in leveraged residual certificates ("TOB Residuals") issued by tender option bond trusts ("TOBs"). A TOB is established by a third party sponsor forming a special purpose entity, into which a Fund, or an agent on behalf of the Fund, transfers municipal securities. A TOB typically issues two classes of beneficial interests: short-term floating rate certificates, which are sold to third party investors, and residual certificates, which are generally issued to the Fund which made the transfer or to affiliates of the Fund. Each Fund's transfers of the municipal securities to a TOB do not qualify for sale treatment under Statement of Financial Accounting Standards No. 140 "Accounting for Transfers and Servicing of Financial Assets and Extinguishments of Liabilities," therefore the municipal securities deposited into a TOB are presented in the Funds' schedules of investments and the proceeds from the transactions are reported as liability for trust certificates. Similarly, proceeds from residual certificates issued to affiliates, if any, from the transaction are included in the liability for trust certificates. Interest income from the underlying security is recorded by the Funds on an accrual basis. Interest expense incurred on the secured borrowing and other expenses related to remarketing, administration and trustee services to a TOB are reported as expenses of a Fund. The floating rate certificates have interest rates that generally reset weekly and their holders have the option to tender certificates to the TOB for redemption at par at each reset date. The residual interests held by the Funds include the right of the Funds (1) to cause the holders of a proportional share of floating rate certificates to tender their certificates at par, and (2) to transfer a corresponding share of the municipal securities from the TOB to the Funds. At April 30, 2007, the aggregate value of the underlying municipal securities transferred to TOBs and the liability for trust certificates were: -------------------------------------------------------------------------------- Underlying Municipal Liability Range of Bonds for Trust Interest Transferred Certificates Rates to TOBs -------------------------------------------------------------------------------- BlackRock MuniYield Fund, Inc. ........ $ 36,112,500 3.95% - 3.98% $ 77,803,233 BlackRock MuniYield Insured Fund, Inc. ........ $182,665,000 3.92% - 4.02% $390,354,034 BlackRock MuniYield Quality Fund, Inc. ........ $ 79,897,914 3.95% - 4.02% $169,499,155 BlackRock MuniYield Quality Fund II, Inc. ..... $ 50,510,000 3.91% - 4.02% $106,455,776 -------------------------------------------------------------------------------- Financial transactions executed through TOBs generally will underperform the market for fixed rate municipal bonds in a rising interest rate environment, but tend to outperform the market for fixed rate bonds when interest rates decline or remain relatively stable. Should short-term interest rates rise, a Fund's investments in TOB Residuals likely will adversely affect a Fund's investment income -- net and distributions to shareholders. Fluctuations in the market value of municipal securities deposited into the TOB may adversely affect the Funds' net asset values per share. While the Funds' investment policies and restrictions expressly permit investments in inverse floating rate securities such as TOB Residuals, they generally do not allow the Funds to borrow money for purposes of making investments. The Funds' management believes that the Funds' restrictions on borrowings do not apply to the secured borrowings deemed to have occurred for accounting purposes. (d) Income taxes -- It is each Fund's policy to comply with the requirements of the Internal Revenue Code applicable to regulated investment companies and to distribute substan- 46 SEMI-ANNUAL REPORTS APRIL 30, 2007 Notes to Financial Statements (continued) tially all of its taxable income to its shareholders. Therefore, no federal income tax provision is required. (e) Security transactions and investment income -- Security transactions are recorded on the dates the transactions are entered into (the trade dates). Realized gains and losses on security transactions are determined on the identified cost basis. Dividend income is recorded on the ex-dividend dates. Interest income is recognized on the accrual basis. The Funds amortize all premiums and discounts on debt securities. (f) Dividends and distributions -- Dividends from net investment income are declared and paid monthly. Distributions of capital gains are recorded on the ex-dividend dates. (g) Offering costs -- Direct expenses relating to the public offering of each Fund's Preferred Stock were charged to capital at the time of issuance of the shares. Any adjustments to estimates of offering costs were recorded back to capital. (h) Recent accounting pronouncements -- In July 2006, the Financial Accounting Standards Board ("FASB") issued Interpretation No. 48 ("FIN 48"), "Accounting for Uncertainty in Income Taxes -- an interpretation of FASB Statement No. 109." FIN 48 prescribes the minimum recognition threshold a tax position must meet in connection with accounting for uncertainties in income tax positions taken or expected to be taken by an entity, including mutual funds, before being measured and recognized in the financial statements. Adoption of FIN 48 is required for the last net asset value calculation in the first required financial statement reporting period for fiscal years beginning after December 15, 2006. The impact on each of the Fund's financial statements, if any, is currently being assessed. In September 2006, "Statement of Financial Accounting Standards No. 157, Fair Value Measurements" ("FAS 157"), was issued and is effective for fiscal years beginning after November 15, 2007. FAS 157 defines fair value, establishes a framework for measuring fair value and expands disclosures about fair value measurements. At this time, management is evaluating the implications of FAS 157 and its impact on each of the Fund's financial statements, if any, has not been determined. In addition, in February 2007, FASB issued "Statement of Financial Accounting Standards No. 159, The Fair Value Option for Financial Assets and Financial Liabilities" ("FAS 159"), which is effective for fiscal years beginning after November 15, 2007. Early adoption is permitted as of the beginning of a fiscal year that begins on or before November 15, 2007, provided the entity also elects to apply the provisions of FAS 157. FAS 159 permits entities to choose to measure many financial instruments and certain other items at fair value that are not currently required to be measured at fair value. FAS 159 also establishes presentation and disclosure requirements designed to facilitate comparisons between entities that choose different measurement attributes for similar types of assets and liabilities. At this time, management is evaluating the implications of FAS 159 and its impact on each of the Fund's financial statements, if any, has not been determined. 2. Investment Advisory Agreement and Transactions with Affiliates: The Investment Advisory Agreement between each Fund and BlackRock Advisors, LLC (the "Manager"), an indirect, wholly owned subsidiary of BlackRock, Inc. became effective on September 29, 2006. Prior to September 29, 2006, Fund Asset Management, L.P. ("FAM") was the Funds' manager. The general partner of FAM is Princeton Services, Inc. ("PSI"), an indirect, wholly owned subsidiary of Merrill Lynch & Co., Inc. ("Merrill Lynch"), which is the limited partner. Merrill Lynch and The PNC Financial Services Group, Inc. are principal owners of BlackRock, Inc. The Manager is responsible for the management of each of the Fund's portfolios and provides the necessary personnel, facilities, equipment and certain other services necessary to the operations of each Fund. For such services, each Fund pays a monthly fee at an annual rate of .50% of the Fund's average daily net assets, including proceeds from the issuance of Preferred Stock. The Manager has agreed to reimburse its management fee by the amount of management fees each Fund pays to the Manager indirectly through its investment in the Black Rock Institutional Tax-Exempt Fund. The reimbursements were as follows: -------------------------------------------------------------------------------- For the Six Months Ended April 30, 2007 Reimbursement by Manager -------------------------------------------------------------------------------- BlackRock MuniYield Fund, Inc. ............................... $7,025 BlackRock MuniYield Insured Fund, Inc. ....................... $3,459 BlackRock MuniYield Quality Fund, Inc. ....................... $4,980 BlackRock MuniYield Quality Fund II, Inc. .................... $4,063 -------------------------------------------------------------------------------- SEMI-ANNUAL REPORTS APRIL 30, 2007 47 Notes to Financial Statements (continued) In addition, the Manager has entered into separate sub-advisory agreements with BlackRock Investment Management, LLC, an affiliate of the Manager, with respect to each Fund, under which the Manager pays the Sub-Adviser for services it provides a fee that is a percentage of the management fee paid by each Fund to the Manager. The Funds reimbursed the Manager for certain accounting services. The reimbursements were as follows: -------------------------------------------------------------------------------- Reimbursement to the Manager -------------------------------------------------------------------------------- BlackRock MuniYield Fund, Inc. .............................. $ 9,813 BlackRock MuniYield Insured Fund, Inc. ...................... $15,011 BlackRock MuniYield Quality Fund, Inc. ...................... $ 6,885 BlackRock MuniYield Quality Fund II, Inc. ................... $ 4,462 -------------------------------------------------------------------------------- Certain officers and/or directors of the Funds are officers and/or directors of BlackRock, Inc. or its affiliates. 3. Investments: Purchases and sales of investments, excluding short-term securities, for the six months ended April 30, 2007 were as follows: -------------------------------------------------------------------------------- Total Total Purchases Sales -------------------------------------------------------------------------------- BlackRock MuniYield Fund, Inc. ........................... $117,225,723 $108,061,910 BlackRock MuniYield Insured Fund, Inc. ................... $809,963,306 $762,862,940 BlackRock MuniYield Quality Fund, Inc. ................... $ 65,079,294 $ 58,154,053 BlackRock MuniYield Quality Fund II, Inc. ................ $ 50,304,370 $ 45,006,849 -------------------------------------------------------------------------------- 4. Stock Transactions: Each Fund is authorized to issue 200,000,000 shares of stock, including Preferred Stock, par value $.10 per share, all of which were initially classified as Common Stock. The Board of Directors is authorized, however, to reclassify any unissued shares of stock without approval of the holders of Common Stock. Common Stock BlackRock MuniYield Fund, Inc. Shares issued and outstanding during the six months ended April 30, 2007 and during the year ended October 31, 2006, increased by 132,043 and 346,987, respectively, as a result of dividend reinvestment. BlackRock MuniYield Insured Fund, Inc., BlackRock MuniYield Quality Fund, Inc. and BlackRock MuniYield Quality Fund II, Inc. Shares issued and outstanding during the six months ended April 30, 2007 and the year ended October 31, 2006 remained constant. Preferred Stock Auction Market Preferred Stock are redeemable shares of Preferred Stock of the Funds, with a liquidation preference of $25,000 per share, plus accrued and unpaid dividends that entitle their holders to receive cash dividends at an annual rate that may vary for the successive dividend periods. The yields in effect at April 30, 2007 were as follows: -------------------------------------------------------------------------------- BlackRock BlackRock BlackRock BlackRock MuniYield MuniYield MuniYield MuniYield Insured Quality Quality Fund, Inc. Fund, Inc. Fund, Inc. Fund II, Inc. -------------------------------------------------------------------------------- Series A .............. 3.42% 3.65% 3.70% 3.75% Series B .............. 3.75% 3.70% 3.85% 3.85% Series C .............. 3.62% 3.62% 3.849% 3.92% Series D .............. 3.54% 3.56% 3.88% 3.80% Series E .............. 3.88% 3.86% 3.92% -- Series F .............. 3.80% 3.80% -- -- Series G .............. 3.55% 3.82% -- -- Series H .............. -- 3.90% -- -- Series I .............. -- 3.88% -- -- -------------------------------------------------------------------------------- Shares issued and outstanding for each of the Funds during the six months ended April 30, 2007 and during the year ended October 31, 2006 remained constant. 48 SEMI-ANNUAL REPORTS APRIL 30, 2007 Notes to Financial Statements (concluded) Each Fund pays commissions to certain broker-dealers at the end of each auction at an annual rate ranging from .25% to .375%, calculated on the proceeds of each auction. For the six months ended April 30, 2007, Merrill Lynch, Pierce, Fenner & Smith Incorporated earned commissions as follows: -------------------------------------------------------------------------------- Commissions -------------------------------------------------------------------------------- BlackRock MuniYield Fund, Inc. ................................. $161,904 BlackRock MuniYield Insured Fund, Inc. ......................... $223,849 BlackRock MuniYield Quality Fund, Inc. ......................... $119,850 BlackRock MuniYield Quality Fund II, Inc. ...................... $ 91,505 -------------------------------------------------------------------------------- 5. Capital Loss Carryforward: BlackRock MuniYield Fund, Inc. At October 31, 2006, the Fund had a net capital loss carryforward of $34,653,455, of which $2,657,924 expires in 2007, $25,806,020 expires in 2008, $6,000,235 expires in 2009 and $189,276 expires in 2010. These amounts will be available to offset like amounts of any future taxable gains. BlackRock MuniYield Insured Fund, Inc. At October 31, 2006, the Fund had a net capital loss carryforward of $1,489,118, all of which expires in 2014. These amounts will be available to offset like amounts of any future taxable gains. BlackRock MuniYield Quality Fund, Inc. At October 31, 2006, the Fund had a net capital loss carryforward of $1,773, all of which expires in 2012. These amounts will be available to offset like amounts of any future taxable gains. BlackRock MuniYield Quality Fund II, Inc. At October 31, 2006, the Fund had a net capital loss carryforward of $32,892,456, of which $181,057 expires in 2007, $26,079,903 expires in 2008, $1,096,837 expires in 2010 and $5,534,659 expires in 2012. These amounts will be available to offset like amounts of any future taxable gains. 6. Subsequent Event: On June 1, 2007, each Fund paid a tax-exempt income dividend to holders of Common Stock of record on May 15, 2007. The amount of the tax-exempt income dividend per share was as follows: -------------------------------------------------------------------------------- Per Share Amount -------------------------------------------------------------------------------- BlackRock MuniYield Fund, Inc. ................................ $.068000 BlackRock MuniYield Insured Fund, Inc. ........................ $.056000 BlackRock MuniYield Quality Fund, Inc. ........................ $.057000 BlackRock MuniYield Quality Fund II, Inc. ..................... $.050000 -------------------------------------------------------------------------------- Availability of Quarterly Schedule of Investments The Funds file their complete schedules of portfolio holdings with the Securities and Exchange Commission ("SEC") for the first and third quarters of each fiscal year on Form N-Q. The Funds' Forms N-Q are available on the SEC's Web site at http://www.sec.gov. The Funds' Forms N-Q may also be reviewed and copied at the SEC's Public Reference Room in Washington, DC. Information on the operation of the Public Reference Room may be obtained by calling 1-800-SEC-0330. SEMI-ANNUAL REPORTS APRIL 30, 2007 49 Officers and Directors Robert C. Doll, Jr., Fund President and Director James H. Bodurtha, Director Kenneth A. Froot, Director Joe Grills, Director Herbert I. London, Director Roberta Cooper Ramo, Director Robert S. Salomon, Jr., Director Donald C. Burke, Vice President and Treasurer John M. Loffredo, Senior Vice President William R. Bock, Vice President Theodore R. Jaeckel Jr., Vice President Michael A. Kalinoski, Vice President Karen Clark, Fund Chief Compliance Officer Alice A. Pellegrino, Secretary BlackRock MuniYield Fund, Inc. and BlackRock MuniYield Quality Fund II, Inc. Custodian The Bank of New York 100 Church Street New York, NY 10286 Transfer Agents Common Stock: The Bank of New York 101 Barclay Street -- 11 East New York, NY 10286 Preferred Stock: The Bank of New York 101 Barclay Street -- 7 West New York, NY 10286 Address of the Funds P.O. Box 9011 Princeton, NJ 08543-9011 BlackRock MuniYield Insured Fund, Inc. and BlackRock MuniYield Quality Fund, Inc. Custodian State Street Bank and Trust Company P.O. Box 351 Boston, MA 02101 Transfer Agents Common Stock: Computershare Trust Company, N.A. P.O. Box 43010 Providence, RI 02940-3010 Preferred Stock: The Bank of New York 101 Barclay Street -- 7 West New York, NY 10286 Investment Objectives NYSE Symbol BlackRock MuniYield Fund, Inc. seeks to provide shareholders MYD with as high a level of current income exempt from federal income taxes as is consistent with its investment policies and prudent investment management by investing primarily in a portfolio of long-term, investment grade municipal obligations the interest on which, in the opinion of bond counsel to the issuer, is exempt from federal income taxes. NYSE Symbol BlackRock MuniYield Insured Fund, Inc. seeks to provide MYI shareholders with as high a level of current income exempt from federal income taxes as is consistent with its investment policies and prudent investment management by investing primarily in a portfolio of long-term, investment grade municipal obligations the interest on which, in the opinion of bond counsel to the issuer, is exempt from federal income taxes. NYSE Symbol BlackRock MuniYield Quality Fund, Inc. seeks to provide MQY shareholders with as high a level of current income exempt from federal income taxes as is consistent with its investment policies and prudent investment management by investing primarily in a portfolio of long-term, high-grade municipal obligations the interest on which, in the opinion of bond counsel to the issuer, is exempt from federal income taxes. NYSE Symbol BlackRock MuniYield Quality Fund II, Inc. seeks to provide MQT shareholders with as high a level of current income exempt from federal income taxes as is consistent with its investment policies and prudent investment management by investing primarily in a portfolio of long-term, high-grade municipal obligations the interest on which, in the opinion of bond counsel to the issuer, is exempt from federal income taxes. The Fund invests primarily in insured municipal bonds. 50 SEMI-ANNUAL REPORTS APRIL 30, 2007 BlackRock Privacy Principles BlackRock is committed to maintaining the privacy of its current and former fund investors and individual clients (collectively, "Clients") and to safeguarding their non-public personal information. The following information is provided to help you understand what personal information BlackRock collects, how we protect that information and why in certain cases we share such information with select parties. If you are located in a jurisdiction where specific laws, rules or regulations require BlackRock to provide you with additional or different privacy-related rights beyond what is set forth below, then BlackRock will comply with those specific laws, rules or regulations. BlackRock obtains or verifies personal non-public information from and about you from different sources, including the following: (i) information we receive from you or, if applicable, your financial intermediary, on applications, forms or other documents; (ii) information about your transactions with us, our affiliates, or others; (iii) information we receive from a consumer reporting agency; and (iv) from visits to our Web sites. BlackRock does not sell or disclose to non-affiliated third parties any non-public personal information about its Clients, except as permitted by law or as is necessary to respond to regulatory requests or to service Client accounts. These non-affiliated third parties are required to protect the confidentiality and security of this information and to use it only for its intended purpose. We may share information with our affiliates to service your account or to provide you with information about other BlackRock products or services that may be of interest to you. In addition, BlackRock restricts access to non-public personal information about its Clients to those BlackRock employees with a legitimate business need for the information. BlackRock maintains physical, electronic and procedural safeguards that are designed to protect the non-public personal information of its Clients, including procedures relating to the proper storage and disposal of such information. Dividend Policy The Funds' dividend policy is to distribute all or a portion of their net investment income to their shareholders on a monthly basis. In order to provide shareholders with a more stable level of dividend distributions, the Funds may at times pay out less than the entire amount of net investment income earned in any particular month and may at times in any month pay out such accumulated but undistributed income in addition to net investment income earned in that month. As a result, the dividends paid by the Funds for any particular month may be more or less than the amount of net investment income earned by the Funds during such month. The Funds' current accumulated but undistributed net investment income, if any, is disclosed in the Statement of Net Assets, which comprises part of the Financial Information included in this report. Electronic Delivery Electronic copies of most financial reports and prospectuses are available on the Funds' Web site. Shareholders can sign up for e-mail notifications of quarterly statements, annual and semi-annual reports and prospectuses by enrolling in the Funds' electronic delivery program. Shareholders Who Hold Accounts with Investment Advisers, Banks or Brokerages: Please contact your financial advisor to enroll. Please note that not all investment advisers, banks or brokerages may offer this service. SEMI-ANNUAL REPORTS APRIL 30, 2007 51 These reports, including the financial information herein, are transmitted to shareholders of BlackRock MuniYield Fund, Inc., BlackRock MuniYield Insured Fund, Inc., BlackRock MuniYield Quality Fund, Inc. and BlackRock MuniYield Quality Fund II, Inc. for their information. This is not a prospectus. Past performance results shown in these reports should not be considered a representation of future performance. The Funds have leveraged their Common Stock and intend to remain leveraged by issuing Preferred Stock to provide the Common Stock shareholders with potentially higher rates of return. Leverage creates risks for Common Stock shareholders, including the likelihood of greater volatility of net asset value and market price of shares of the Common Stock, and the risk that fluctuations in the short-term dividend rates of the Preferred Stock may affect the yield to Common Stock shareholders. Statements and other information herein are as dated and are subject to change. A description of the policies and procedures that the Funds use to determine how to vote proxies relating to portfolio securities is available (1) without charge, upon request, by calling toll-free 1-800-441-7762; (2) at www.blackrock.com; and (3) on the Securities and Exchange Commission's Web site at http://www.sec.gov. Information about how the Funds voted proxies relating to securities held in the Funds' portfolios during the most recent 12-month period ended June 30 is available (1) at www.blackrock.com and (2) on the Securities and Exchange Commission's Web site at http://www.sec.gov. BlackRock MuniYield Fund, Inc. BlackRock MuniYield Insured Fund, Inc. BlackRock MuniYield Quality Fund, Inc. BlackRock MuniYield Quality Fund II, Inc. P.O. Box 9011 Princeton, NJ 08543-9011 BLACKROCK #MYQII-4/07 Item 2 - Code of Ethics - Not Applicable to this semi-annual report Item 3 - Audit Committee Financial Expert - Not Applicable to this semi-annual report Item 4 - Principal Accountant Fees and Services - Not Applicable to this semi-annual report Item 5 - Audit Committee of Listed Registrants - Not Applicable to this semi-annual report Item 6 - Schedule of Investments - The registrant's Schedule of Investments is included as part of the Report to Stockholders filed under Item 1 of this form. Item 7 - Disclosure of Proxy Voting Policies and Procedures for Closed-End Management Investment Companies - Not Applicable to this semi-annual report Item 8 - Portfolio Managers of Closed-End Management Investment Companies - Not Applicable to this semi-annual report Item 9 - Purchases of Equity Securities by Closed-End Management Investment Company and Affiliated Purchasers - Not Applicable Item 10 - Submission of Matters to a Vote of Security Holders - The registrant's Nominating Committee will consider nominees to the Board recommended by shareholders when a vacancy becomes available. Shareholders who wish to recommend a nominee should send nominations which include biographical information and set forth the qualifications of the proposed nominee to the registrant's Secretary. There have been no material changes to these procedures. Item 11 - Controls and Procedures 11(a) - The registrant's principal executive and principal financial officers or persons performing similar functions have concluded that the registrant's disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940, as amended (the "1940 Act")) are effective as of a date within 90 days of the filing of this report based on the evaluation of these controls and procedures required by Rule 30a-3(b) under the 1940 Act and Rule 13a-15(b) under the Securities and Exchange Act of 1934, as amended. 11(b) - There were no changes in the registrant's internal control over financial reporting (as defined in Rule 30a-3(d) under the Act (17 CFR 270.30a-3(d)) that occurred during the second fiscal quarter of the period covered by this report that have materially affected, or are reasonably likely to materially affect, the registrant's internal control over financial reporting. Item 12 - Exhibits attached hereto 12(a)(1) - Code of Ethics - Not Applicable to this semi-annual report 12(a)(2) - Certifications - Attached hereto 12(a)(3) - Not Applicable 12(b) - Certifications - Attached hereto Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. BlackRock MuniYield Insured Fund, Inc. By: /s/ Robert C. Doll, Jr. -------------------------------------- Robert C. Doll, Jr., Chief Executive Officer of BlackRock MuniYield Insured Fund, Inc. Date: June 19, 2007 Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated. By: /s/ Robert C. Doll, Jr. -------------------------------------- Robert C. Doll, Jr., Chief Executive Officer of BlackRock MuniYield Insured Fund, Inc. Date: June 19, 2007 By: /s/ Donald C. Burke -------------------------------------- Donald C. Burke, Chief Financial Officer of BlackRock MuniYield Insured Fund, Inc. Date: June 19, 2007