UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM N-CSR CERTIFIED SHAREHOLDER REPORT OF REGISTERED MANAGEMENT INVESTMENT COMPANIES Investment Company Act file number 811-5615 John Hancock Patriot Premium Dividend Fund I (Exact name of registrant as specified in charter) 101 Huntington Avenue, Boston, Massachusetts 02199 (Address of principal executive offices) (Zip code) Alfred P. Ouellette Senior Attorney and Assistant Secretary 101 Huntington Avenue Boston, Massachusetts 02199 (Name and address of agent for service) Registrant's telephone number, including area code: 617-375-1513 Date of fiscal year end: September 30 Date of reporting period: March 31, 2005 ITEM 1. REPORT TO SHAREHOLDERS. JOHN HANCOCK Patriot Premium Dividend Fund I 3.31.2005 Semiannual Report [A 2" x 1" John Hancock (Signature)/John Hancock Funds logo in lower, center middle of page. A tag line below reads "JOHN HANCOCK FUNDS."] [A photo of James A. Shepherdson, Chief Executive Officer, flush left next to first paragraph.] CEO CORNER Table of contents Your fund at a glance page 1 Managers' report page 2 Fund's investments page 6 Financial statements page 10 For more information page 25 Dear Fellow Shareholders, After advancing for a second straight year in 2004, the stock market pulled back in the first three months of 2005. For much of 2004 the market had been in the doldrums as investors fretted about rising oil prices, higher interest rates, the war in Iraq and a closely contested presidential race. But the year ended on a high note with a sharp rally sparked by a definitive end to the U.S. presidential election and moderating oil prices. Investors were brought back down to earth in January, however, as the market declined in three of the four weeks and produced negative results for the month in a broad-based move downward. Rising oil prices and interest rates, and concerns about less robust corporate earnings growth were among the culprits that kept investors on the sidelines. Investors began to re-enter the market in February, reversing January's decline. But as the quarter progressed investors again grew concerned about further spikes in oil prices and rising interest rates. As a result, the first quarter of 2005 ended with the major indexes in the red. By the end of March, the Dow Jones Industrial Average had returned -2.06%, the S&P 500 Index returned -2.15%, while the Nasdaq Composite Index fell by 8.0%. Bonds were slightly less negative in the first three months, with the Lehman Brothers Aggregate Bond Index returning -0.48%. The way the financial markets have been playing out recently serves as a good reminder of why keeping a long-term perspective is such a critical element of successful investing. Getting caught up in the day-to-day twists and turns of the market -- and trying to act on them -- can wreak havoc with your portfolio and derail progress toward meeting your overall financial objectives. Since no one can predict the market's moves, the best way to reach your goals is to stay invested and stick to your plan. Investing should be a marathon, not a sprint. Do not try to time the market, and make sure you work with your investment professional to ensure that your portfolio remains properly diversified to meet your long-term objectives. For example, after several years of dominance, small-cap stocks and value stocks could now represent higher percentages of your portfolio than you may want. If you are comfortable with your financial plan, it becomes easier to ride out the market's daily ups and downs. It could also provide you with a greater chance of success over time. Sincerely, /S/ JAMES A. SHEPHERDSON James A. Shepherdson, Chief Executive Officer This commentary reflects the CEO's views as of March 31, 2005. They are subject to change at any time. YOUR FUND AT A GLANCE The Fund seeks to provide high current income, consistent with modest growth of capital, for hold- ers of its common shares by investing at least 80% of its assets in dividend- paying securities. Over the last six months * Despite rising interest rates, preferred stocks posted good gains in response to strong demand, weak supply and hopes that dividend tax cuts would be made permanent. * The Fund benefited from good security selection, but lagged the Lipper peer group average due to its focus on preferred stocks in a period when utility commons outperformed. * High quality, tax-advantaged preferred stocks and convertible securities aided performance. [Bar chart with heading "John Hancock Patriot Premium Dividend Fund I." Under the heading is a note that reads "Fund performance for the six months ended March 31, 2005." The chart is scaled in increments of 4% with 0% at the bottom and 8% at the top. The first bar represents the Fund's 7.22% net asset value and the second bar represents the Fund's 0.22% market value. A note below the chart reads "The total returns for the Fund are with all distributions reinvested. The performance data contained within this material represents past performance, which does not guarantee future results. Top 10 issuers 7.7% NSTAR 5.6% Energy East Corp. 4.6% Lehman Brothers Holdings, Inc. 3.9% Baltimore Gas & Electric Co. 3.7% El Paso Tennessee Pipeline Co. 3.7% Sierra Pacific Power Co. 3.0% CH Energy Group, Inc. 2.7% DTE Energy Co. 2.7% South Carolina Electric & Gas Co. 2.6% Alabama Power Co. As a percentage of net assets plus the value of preferred shares on March 31, 2005. 1 BY GREGORY K. PHELPS AND MARK T. MALONEY FOR THE PORTFOLIO MANAGEMENT TEAM MANAGERS' REPORT JOHN HANCOCK Patriot Premium Dividend Fund I Dividend-paying securities encountered mixed conditions during the six-month period ended March 31, 2005. Preferred stocks -- which are the primary emphasis of John Hancock Patriot Premium Dividend Fund I -- performed reasonably well from the beginning of the period last October through roughly mid February 2005. Because preferreds make fixed payments in the form of dividends, their prices tend to follow those of U.S. Treasury securities. Despite evidence of a strengthening economy and additional short-term interest rate hikes by the Federal Reserve Board, preferred stock prices generally moved higher, mirroring a somewhat positive tone in the U.S. Treasury market. That rally was based on investors' confidence that even though the Fed might continue to raise rates, those rate hikes would be small and measured given the potential for record high oil prices and higher interest rates themselves to dampen economic growth. Preferred stocks were further boosted by the combination of constrained supply and strong demand. Supply was muted, as fewer companies issued new preferred securities, while others bought back their outstanding shares. Demand was fueled by investors' appetite for yield, particularly in light of the fact that changes in the tax code in 2003 helped to make ownership of certain dividend-yielding stocks more attractive. Investors also viewed the re-election of President George Bush as a positive for tax-advantaged preferred stocks, because he vowed to make permanent the 2003 provisions that reduced the tax rate most individuals pay on many stock dividends. "Dividend-paying securities encountered mixed conditions during the six-month period ended March 31, 2005." But from about mid-February through the end of the period on March 31, 2005, preferred stocks weakened in response to a series of developments that suggested further interest rate hikes were in the offing. These developments included record-setting oil prices, stronger-than-expected data on the jobs market and comments from the Fed that it had seen evidence of a pickup in inflation. 2 Utility common stocks Utility common stocks -- the Fund's other main focus -- also seesawed during the period. They generally lagged the overall stock market in the fourth quarter of 2004, as investors sought out companies with higher growth prospects. But utility common stocks held their ground far better than preferred and many other common-stock groups in the final weeks of the period. Their resiliency was due to the combination of growing demand for their tax-advantaged dividends and a perception that utility companies' financial shape continued to improve. [Photos of Greg Phelps and Mark Maloney flush right at top of page.] Performance For the six months ended March 31, 2005, John Hancock Patriot Premium Dividend Fund I returned 7.22% at net asset value and 0.22% at market value. The difference in the Fund's net asset value (NAV) performance and its market performance stems from the fact that the market share price is subject to the dynamics of secondary market trading, which could cause it to trade at a discount or premium to the Fund's NAV share price at any time. By comparison, the average income and preferred stock closed-end fund returned 5.50% at net asset value, according to Lipper, Inc. In the same six-month period, the Dow Jones Utility Average -- which tracks the performance of 15 electric and natural gas utilities -- returned 23.59%, and the broader stock market as measured by the Standard & Poor's 500 Index returned 6.88%. "The strong demand for tax-advantaged preferred holdings helped support many of our hold ings that sported that feature." Tax-advantaged holdings among top performers The strong demand for tax-advantaged preferred holdings helped support many of our holdings that sported that feature. A good example was Baltimore Gas & Electric Co., a regulated electric and gas public utility in central Maryland. It also benefited from the fact that it carried a high coupon, which helped cushion its price declines, and the fact that there is limited supply of this high-quality holding. Southern Union Co. also enjoyed relatively good performance for similar reasons. On the flip side, our fully taxable, lower-coupon holdings in financial services company Morgan Stanley, proved disappointing. 3 Oil and gas-related utility stocks also post strong results Rising energy prices provided the fuel for improved company profitability and higher prices for some of our holdings in utility common stocks involved with oil and gas production. Among the best performers were our common-stock holdings in Dominion Resources, one of the nation's largest producers of energy. Other winners in this segment included National Fuel Gas Co., an integrated natural gas company, and NiSource, Inc., which is engaged in natural gas transmission, storage and distribution, as well as electric generation, transmission and distribution. Among our preferred stock holdings in this sector, we had strong performances from Anadarko Petroleum Corp., Apache Corp. and Devon Energy Corp. [Table at top left-hand side of page entitled "Industry distribution1." The first listing is Electric utilities 41%, the second is Multi-utilities & unregulated power 19%, the third is Investment banking & brokerage 10%, the fourth is Gas utilities 9%, the fifth is Oil & gas exploration & production 8%, the sixth is All other 5%, the seventh is Integrated oil & gas 3%, the eighth is Broadcasting & cable TV 2%, the ninth is Agricultural products 1%, the tenth is Integrated telecommunication services 1% and the eleventh is Diversified banks 1%.] [Pie chart in middle of page with heading "Portfolio diversification1." The chart is divided into three segments (from top to right): Preferred stocks 63%, Common stocks 34% and Short-term investments & other 3%.] Outlook In our view, the Fed probably hasn't yet reached the end of its campaign to raise short-term interest rates to cool economic growth and potential inflationary pressures. This could pose periodic short-term challenges for dividend-producing securities. Over the longer term, however, we're more upbeat, especially given the fact that we believe a good portion, if not all, of future interest rate hikes already have been factored into preferred and utility common stock prices. Furthermore, there are already some tangible signs that economic growth has cooled as rates have moved higher. The housing market has started to slow, with adjustable-rate mortgages moving higher and conventional 30-year mortgages exceeding 6% at times. Higher oil prices will also probably act as a drag on economic growth, most likely by reducing consumers' disposable income and raising corporate America's cost of doing business. 4 Another signal pointing to slack economic growth is the March job numbers, which were lackluster at best. We believe that a slower-growth, low-inflationary environment will provide a favorable backdrop for both preferred and utility common stocks. That, coupled with what we believe will continue to be a favorable supply and demand backdrop, should benefit many dividend-paying securities in the months to come. [Table at top of page entitled "Scorecard." The header for the left column is "Investment" and the header for the right column is "Period's performanceand what's behind the numbers." The first listing is Baltimore Gas & Electric followed by an up arrow with the phrase "High yield helps stock weather market decline." The second listing is Dominion Resources followed by an up arrow with the phrase "High energy prices boost financial performance." The third listing is Morgan Stanley followed by a down arrow with the phrase "Low coupon offers little cushion against market selloff."] "We believe that a slower-growth, low-inflationary environment will provide a favorable backdrop for both preferred and utility common stocks." This commentary reflects the views of the team through the end of the Fund's period discussed in this report. The managers' statements reflect their own opinions. As such, they are in no way guarantees of future events and are not intended to be used as investment advice or a recommendation regarding any specific security. They are also subject to change at any time as market and other conditions warrant. The Fund normally will invest at least 25% of its managed assets in securities of companies in the utilities industry. Such an investment concentration makes the Fund more susceptible than a more broadly diversified fund to factors adversely affecting the utilities industry. Sector investing is subject to greater risks than the market as a whole. 1 As a percentage of the Fund's portfolio on March 31, 2005. 5 FINANCIAL STATEMENTS FUND'S INVESTMENTS Securities owned by the Fund on March 31, 2005 (unaudited) This schedule is divided into three main categories: common stocks, preferred stocks, and short-term investments. The stocks are further broken down by industry group. Short-term investments, which represent the Fund's cash position, are listed last. Issuer Shares Value Common stocks 49.39% $72,453,429 (Cost $70,593,627) Electric Utilities 32.01% 46,958,114 Alliant Energy Corp. 150,380 4,027,176 Ameren Corp. 45,900 2,249,559 CH Energy Group, Inc. 141,350 6,459,695 Consolidated Edison, Inc. 32,000 1,349,760 DTE Energy Co. 126,000 5,730,480 Great Plains Energy, Inc. 10,750 328,735 NSTAR 175,000 9,502,500 Progress Energy, Inc. 52,500 2,202,375 Progress Energy, Inc., (Contingent Value Obligation) (B)(I) 69,000 8,280 Puget Energy, Inc. 216,900 4,780,476 Sierra Pacific Resources (I) 246,600 2,650,950 TECO Energy, Inc. 173,000 2,712,640 WPS Resources Corp. 40,400 2,137,968 Xcel Energy, Inc. 164,000 2,817,520 Gas Utilities 5.89% 8,639,660 KeySpan Corp. 136,450 5,317,456 NiSource, Inc. 67,600 1,540,604 Peoples Energy Corp. 42,500 1,781,600 Integrated Telecommunication Services 0.89% 1,303,207 SBC Communications, Inc. 55,000 1,302,950 Touch America Holdings, Inc. (I) 151,000 257 See notes to financial statements. 6 FINANCIAL STATEMENTS Issuer Shares Value Multi-Utilities & Unregulated Power 10.60% $15,552,448 Aquila, Inc. (I) 180,000 689,400 Dominion Resources, Inc. 64,300 4,785,849 Duke Energy Corp. 40,000 1,120,400 Energy East Corp. 257,000 6,738,540 National Fuel Gas Co. 47,150 1,348,019 Public Service Enterprise Group, Inc. 16,000 870,240 Credit Issuer, description rating (A) Shares Value Preferred stocks 92.75% $136,052,431 (Cost $135,617,143) Agricultural Products 1.96% 2,871,096 Ocean Spray Cranberries, Inc., 6.25%, Ser A (S) BB+ 35,000 2,871,096 Broadcasting & Cable TV 3.17% 4,649,050 Shaw Communications, Inc., 8.50% (Canada) B+ 185,000 4,649,050 Consumer Finance 0.49% 711,750 SLM Corp., 6.97%, Ser A BBB+ 13,000 711,750 Diversified Banks 1.63% 2,386,764 Royal Bank of Scotland Group Plc, 5.75%, Ser L (United Kingdom) A 100,200 2,386,764 Electric Utilities 27.88% 40,904,297 Alabama Power Co., 5.20% BBB+ 225,000 5,575,500 Boston Edison Co., 4.25% BBB+ 58,152 4,801,174 Boston Edison Co., 4.78% BBB+ 25,558 2,325,778 Duquesne Light Co., 6.50% BB+ 20,000 1,078,600 FPC Capital I, 7.10%, Ser A BB+ 70,700 1,780,226 Georgia Power Co., 6.00%, Ser R A 213,800 5,327,896 Great Plains Energy, Inc., 4.35% BB+ 23,638 1,857,947 Great Plains Energy, Inc., 4.50% BB+ 12,510 994,545 HECO Capital Trust III, 6.50% BBB- 45,000 1,143,450 Monongahela Power Co., $7.73, Ser L B- 34,500 3,432,750 PPL Electric Utilities Corp., 4.60% BBB 3,670 293,256 PSI Energy, Inc., 6.875% BBB- 37,000 3,794,350 Public Service Electric & Gas Co., 4.30%, Ser C BB+ 7,940 635,200 Sierra Pacific Power Co., 7.80%, Ser 1 (Class A) CCC+ 210,000 5,250,000 Virginia Electric & Power Co., $7.05 BBB- 10,200 1,062,075 Xcel Energy, Inc., $4.11, Ser D BB+ 20,150 1,551,550 See notes to financial statements. 7 FINANCIAL STATEMENTS Credit Issuer, description rating (A) Shares Value Gas Utilities 7.42% $10,889,273 El Paso Tennessee Pipeline Co., 8.25%, Ser A CCC- 156,400 7,903,095 Southern Union Co., 7.55% BB+ 111,800 2,986,178 Integrated Oil & Gas 3.62% 5,304,050 Coastal Finance I, 8.375% CCC- 215,000 5,304,050 Integrated Telecommunication Services 0.89% 1,307,100 Telephone & Data Systems, Inc., 6.625% A- 50,000 1,256,250 Touch America Holdings, Inc., $6.875 (I)(H) D 50,850 50,850 Investment Banking & Brokerage 15.29% 22,435,655 Bear Stearns Cos., Inc. (The), 5.49%, Depositary Shares, Ser G BBB 25,000 1,263,750 Bear Stearns Cos., Inc. (The), 5.72%, Depositary Shares, Ser F BBB 102,460 5,302,305 J.P. Morgan Chase & Co., 6.625%, Depositary Shares, Ser H A- 72,000 3,758,400 Lehman Brothers Holdings, Inc., 5.67%, Depositary Shares, Ser D BBB+ 102,700 5,135,000 Lehman Brothers Holdings, Inc., 5.94%, Depositary Shares, Ser C BBB+ 90,400 4,678,200 Morgan Stanley Capital Trust V, 5.75% A1 100,000 2,298,000 Multi-Utilities & Unregulated Power 16.85% 24,721,264 Baltimore Gas & Electric Co., 6.99%, Ser 1995 Baa1 34,000 3,543,439 BGE Capital Trust II, 6.20% BBB- 190,000 4,873,500 Energy East Capital Trust I, 8.25% BBB- 200,000 5,240,000 PSEG Funding Trust II, 8.75% BB+ 70,000 1,919,400 Public Service Electric & Gas Co., 6.92% BB+ 26,800 2,782,175 South Carolina Electric & Gas Co., 6.52% Baa1 55,000 5,720,000 TECO Capital Trust I, 8.50% B 25,000 642,750 Oil & Gas Exploration & Production 11.95% 17,532,582 Anadarko Petroleum Corp., 5.46%, Depositary Shares, Ser B BBB- 45,278 4,425,924 Apache Corp., 5.68%, Depositary Shares, Ser B BBB 25,000 2,573,438 Devon Energy Corp., 6.49%, Ser A BB+ 50,000 5,198,440 Nexen, Inc., 7.35% (Canada) BB+ 205,500 5,334,780 Regional Banks 1.60% 2,339,550 HSBC USA, Inc., $2.8575 A2 45,000 2,339,550 See notes to financial statements. 8 FINANCIAL STATEMENTS Interest Par value Issuer, maturity date rate (000) Value Short-term investments 4.30% $6,312,000 (Cost $6,312,000) Commercial Paper 4.30% 6,312,000 ChevronTexaco Corp., 4-1-05 2.700% $6,312 6,312,000 Total investments 146.44% $214,817,860 Other assets and liabilities, net 0.32% $473,809 Fund preferred shares, at value (46.76%) ($68,593,236) Total net assets 100.00% $146,698,433 (A) Credit ratings are unaudited and are rated by Moody's Investors Service where Standard & Poor's ratings are not available. (B) This security is fair valued in good faith under procedures established by the Board of Trustees. (H) Non-income-producing issuer filed for protection under the Federal Bankruptcy Code or is in default of interest payment. (I) Non-income-producing security. (S) This security is exempt from registration under Rule 144A of the Securities Act of 1933. Such security may be resold, normally to qualified institutional buyers, in transactions exempt from registration. Rule 144A securities amounted to $2,871,096 or 1.96% of the Fund's net assets as of March 31,2005. Parenthetical disclosure of a foreign country in the security description represents country of a foreign issuer. The percentage shown for each investment category is the total value of that category as a percentage of the net assets of the Fund. See notes to financial statements. 9 FINANCIAL STATEMENTS ASSETS AND LIABILITIES March 31, 2005 (unaudited) This Statement of Assets and Liabilities is the Fund's balance sheet. It shows the value of what the Fund owns, is due and owes. You'll also find the net asset value for each common share. Assets Investments, at value (cost $212,522,770) $214,817,860 Cash 573 Dividends receivable 710,679 Other assets 44,935 Total assets 215,574,047 Liabilities Payable for investments purchased 51,000 Payable to affiliates Management fees 166,568 Other 17,310 Other payables and accrued expenses 47,500 Total liabilities 282,378 Dutch Auction Rate Transferable Securities preferred shares Series A (DARTS), at value, unlimited number of shares of beneficial interest authorized with no par value, 685 shares issued, liquidation preference of $100,000 per share 68,593,236 Net assets Common shares capital paid-in 143,247,170 Accumulated net realized gain on investments 541,438 Net unrealized appreciation of investments 2,295,090 Accumulated net investment income 614,735 Net assets applicable to common shares $146,698,433 Net asset value per common share Based on 15,292,571 shares of beneficial interest outstanding -- unlimited number of shares authorized with no par value $9.59 See notes to financial statements. 10 FINANCIAL STATEMENTS OPERATIONS For the period ended March 31, 2005 (unaudited) 1 This Statement of Operations summarizes the Fund's investment income earned and expenses incurred in operating the Fund. It also shows net gains (losses) for the period stated. Investment income Dividends $6,087,567 Interest 81,335 Total investment income 6,168,902 Expenses Investment management fees 844,142 Administration fees 107,139 DARTS auction fees 84,469 Federal excise tax 70,017 Miscellaneous 25,548 Custodian fees 22,723 Printing 20,995 Professional fees 20,388 Transfer agent fees 20,138 Registration and filing fees 11,404 Trustees' fees 5,676 Interest 116 Total expenses 1,232,755 Net investment income 4,936,147 Realized and unrealized gain Net realized gain on investments 554,143 Change in net unrealized appreciation (depreciation) of investments 5,460,740 Net realized and unrealized gain 6,014,883 Distributions to DARTS (722,778) Increase in net assets from operations $10,228,252 1 Semiannual period from 10-1-04 through 3-31-05. See notes to financial statements. 11 FINANCIAL STATEMENTS CHANGES IN NET ASSETS These Statements of Changes in Net Assets show how the value of the Fund's net assets has changed during the last two periods. The difference reflects earnings less expenses, any investment gains and losses, distributions, if any, paid to shareholders and the net of Fund share transactions. Year Period ended ended 9-30-04 3-31-05 1 Increase (decrease) in net assets From operations Net investment income $9,789,851 $4,936,147 Net realized gain 66,438 554,143 Change in net unrealized appreciation (depreciation) 8,308,808 5,460,740 Distributions to DARTS (836,184) (722,778) Increase in net assets resulting from operations 17,328,913 10,228,252 Distributions to common shareholders From net investment income (10,919,843) (4,951,797) From Fund share transactions 1,037,662 350,124 Net assets Beginning of period 133,625,122 141,071,854 End of period 2 $141,071,854 $146,698,433 1 Semiannual period from 10-1-04 through 3-31-05. Unaudited. 2 Includes accumulated net investment income of $1,353,163 and $614,735, respectively. See notes to financial statements. 12 FINANCIAL HIGHLIGHTS FINANCIAL HIGHLIGHTS COMMON SHARES The Financial Highlights show how the Fund's net asset value for a share has changed since the end of the previous period. Period ended 9-30-00 9-30-01 9-30-02 9-30-03 9-30-04 3-31-05 1 Per share operating performance Net asset value, beginning of period $9.91 $10.13 $9.74 $8.30 $8.82 $9.25 Net investment income 2 0.85 0.83 0.78 0.69 0.64 0.32 Net realized and unrealized gain (loss) on investments 0.23 (0.39) (1.49) 0.54 0.56 0.39 Distributions to DARTS (0.21) (0.18) (0.08) (0.06) (0.05) (0.05) Total from investment operations 0.87 0.26 (0.79) 1.17 1.15 0.66 Less distributions to common shareholders From net investment income (0.65) (0.65) (0.65) (0.65) (0.72) (0.32) Net asset value, end of period $10.13 $9.74 $8.30 $8.82 $9.25 $9.59 Per share market value, end of period $8.25 $8.75 $9.15 $9.24 $9.38 $9.09 Total return at market value 3 (%) 1.19 13.79 12.03 8.91 9.76 0.22 4 Ratios and supplemental data Net assets applicable to common shares, end of period (in millions) $152 $146 $125 $134 $141 $147 Ratio of expenses to average net assets 5 (%) 1.75 1.72 1.79 1.90 1.70 1.69 6 Ratio of net investment income to average net assets 7 (%) 8.94 8.35 8.42 8.33 7.06 6.76 6 Portfolio turnover (%) 19 23 11 10 16 5 Senior securities Total value of DARTS outstanding (in millions) $68 $68 $68 $69 $69 $69 Involuntary liquidation preference per unit (in thousands) $100 $100 $100 $100 $100 $100 Average market value per unit (in thousands) $100 $100 $100 $100 $100 $100 Asset coverage per unit 8 $315,176 $318,208 $280,462 $287,811 $304,418 $315,510 See notes to financial statements. 13 FINANCIAL HIGHLIGHTS Notes to Financial Highlights 1 Semiannual period from 10-1-04 through 3-31-05. Unaudited. 2 Based on the average of the shares outstanding. 3 Assumes dividend reinvestment. 4 Not annualized. 5 Ratios calculated on the basis of expenses relative to the average net assets of common shares. Without the exclusion of preferred shares, the annualized ratio of expenses would have been 1.18%, 1.18%, 1.20%, 1.23%, 1.14% and 1.15%, respectively. 6 Annualized. 7 Ratios calculated on the basis of net investment income relative to the average net assets of common shares. Without the exclusion of preferred shares, the annualized ratio of net investment income would have been 6.03%, 5.72%, 5.65%, 5.39%, 4.73% and 4.61%, respectively. 8 Calculated by subtracting the Fund's total liabilities from the Fund's total assets and dividing such amount by the number of DARTS outstanding as of the applicable 1940 Act Evaluation Date, which may differ from the financial reporting date. See notes to financial statements. 14 NOTES TO STATEMENTS Unaudited Note A Accounting policies John Hancock Patriot Premium Dividend Fund I (the "Fund") is a diversified closed-end management investment company registered under the Investment Company Act of 1940. Significant accounting policies of the Fund are as follows: Valuation of investments Securities in the Fund's portfolio are valued on the basis of market quotations, valuations provided by independent pricing services or at fair value as determined in good faith in accordance with procedures approved by the Trustees. Short-term debt investments, which have a remaining maturing of 60 days or less may be valued at amortized cost which approximates market value. The Fund determines the net asset value of the common shares each business day. Investment transactions Investment transactions are recorded as of the date of purchase, sale or maturity. Net realized gains and losses on sales of investments are determined on the identified cost basis. Expenses The majority of the expenses are directly identifiable to an individual fund. Expenses that are not readily identifiable to a specific fund are allocated in such a manner as deemed equitable, taking into consideration, among other things, the nature and type of expense and the relative sizes of the funds. Federal income taxes The Fund qualifies as a "regulated investment company" by complying with the applicable provisions of the Internal Revenue Code and will not be subject to federal income tax on taxable income that is distributed to shareholders. Therefore, no federal income tax provision is required. Dividends, interest and distributions Dividend income on investment securities is recorded on the ex-dividend date or, in the case of some foreign securities, on the date thereafter when the Fund identifies the dividend. Interest income on investment securities is recorded on the accrual basis. The Fund may place a security on non-accrual status and reduce related investment income by ceasing current accruals or writing off interest, or dividends receivable, when the collection of income has become doubtful. Foreign income may be subject to foreign withholding taxes, which are accrued as applicable. The Fund records distributions to shareholders from net investment income and net realized gains, if any, on the ex-dividend date. During the year ended September 30, 2004, the tax character of distributions paid was as follows: ordinary income $11,756,027. Such distributions, on a tax basis, are determined in conformity with income tax regulations, which may differ from accounting principles generally accepted in 15 the United States of America. Distributions in excess of tax basis earnings and profits, if any, are reported in the Fund's financial statements as a return of capital. Use of estimates The preparation of these financial statements, in accordance with accounting principles generally accepted in the United States of America, incorporates estimates made by management in determining the reported amount of assets, liabilities, revenues and expenses of the Fund. Actual results could differ from these estimates. Note B Management fee and transactions with affiliates and others The Fund has an investment management contract with John Hancock Advisers, LLC (the "Adviser"), a wholly owned subsidiary of John Hancock Financial Services, Inc. Under the investment management contract, the Fund pays a monthly management fee to the Adviser at an annual rate of 0.50% of the Fund's average weekly net asset value and the value attributable to the Dutch Auction Rate Transferable Securities preferred shares (collectively, managed assets"), plus 5.00% of the Fund's weekly gross income. The Adviser's total fee is limited to a maximum amount equal to 1.00% annually of the Fund's average weekly managed assets. For the period ended March 31, 2005, the advisory fee incurred did not exceed the maximum advisory fee allowed. The Fund has an administrative agreement with the Adviser under which the Adviser oversees the custodial, auditing, valuation, accounting, legal, stock transfer and dividend disbursing services and maintains Fund communications with shareholders. The Fund pays the Adviser a monthly administration fee at an annual rate of 0.10% of the Fund's average weekly managed assets. The compensation for the period amounted to $107,139. The Fund also paid the Adviser the amount of $1,120 for certain publishing services, included in the printing fees. Mr. James A. Shepherdson is a director and officer of the Adviser, as well as affiliated Trustee of the Fund, and is compensated by the Adviser. The compensation of unaffiliated Trustees is borne by the Fund. The unaffiliated Trustees may elect to defer for tax purposes their receipt of this compensation under the John Hancock Group of Funds Deferred Compen sation Plan. The Fund makes investments into other John Hancock funds, as applicable, to cover its liability for the deferred compensation. Investments to cover the Fund's deferred compensation liability are recorded on the Fund's books as an other asset. The deferred compensation liability and the related other asset are always equal and are marked to market on a periodic basis to reflect any income earned by the investments, as well as any unrealized gains or losses. The Deferred Compensation Plan investments had no impact on the operations of the Fund. 16 Note C Fund share transactions This listing illustrates the Fund's common shares, dividend reinvestments, reclassification of the Fund's capital accounts and the number of common shares outstanding at the beginning and end of the last two periods, along with the corresponding dollar value. Year ended 9-30-04 Period ended 3-31-05 1 Shares Amount Shares Amount Beginning of period 15,142,247 $141,943,091 15,255,559 $142,897,046 Dividends reinvested 113,312 1,037,662 37,012 350,124 Reclassification of capital accounts -- (83,707) -- -- End of period 15,255,559 $142,897,046 15,292,571 $143,247,170 1 Semiannual period from 10-1-04 through 3-31-05. Unaudited. Dutch Auction Rate Transferable Securities preferred shares Series A The Fund issued 685 shares of Dutch Auction Rate Transferable Securities preferred shares Series A ("DARTS") in a public offering. The underwriting discount was recorded as a reduction of the capital of common shares. Dividends on the DARTS, which accrue daily, are cumulative at a rate that was established at the offering of the DARTS and has been reset every 49 days thereafter by an auction. Dividend rates on DARTS ranged from 1.64% to 2.45% during the period ended March 31, 2005. Accrued dividends on DARTS are included in the value of DARTS on the Fund's Statement of Assets and Liabilities. The DARTS are redeemable at the option of the Fund, at a redemption price equal to $100,000 per share, plus accumulated and unpaid dividends on any dividend payment date. The DARTS are also subject to mandatory redemption at a redemption price equal to $100,000 per share, plus accumulated and unpaid dividends, if the Fund is in default on its asset coverage requirements with respect to the DARTS, as defined in the Fund's by-laws. If the dividends on the DARTS shall remain unpaid in an amount equal to two full years dividends, the holders of the DARTS, as a class, have the right to elect a majority of the Board of Trustees. In general, the holders of the DARTS and the common shareholders have equal voting rights of one vote per share, except that the holders of the DARTS, as a class, vote to elect two members of the Board of Trustees, and separate class votes are required on certain matters that affect the respective interests of the DARTS and common shareholders. Note D Investment transactions Purchases and proceeds from sales of securities, other than short-term securities and obligations of the U.S. government, during the period ended March 31, 2005, aggregated $9,921,106 and $9,372,404, respectively. The cost of investments owned on March 31, 2005, including short-term investments, for federal income tax purposes, was $212,546,155. Gross unrealized appreciation and depreciation of investments aggregated $19,199,764 and $16,928,059, respectively, resulting in net unrealized appreciation of $2,271,705. The difference between book basis and tax basis net unrealized appreciation of investments is attributable primarily to the tax deferral of losses on certain sales of securities. 17 Investment objective and policy The Fund's investment objective is to provide a high current income consistent with modest growth of capital for holders of its common shares of beneficial interest. The Fund will pursue its objective by investing in a diversified portfolio of dividend-paying preferred and common stocks. The Fund's non-fundamental investment policy with respect to the quality of ratings of its portfolio investments, which was changed by a vote of the Fund's Trustees on September 13, 1994 and became effective October 15, 1994, stipulates that preferred stocks and debt obligations in which the Fund will invest will be rated investment-grade (at least "BBB" by S&P or "Baa" by Moody's) at the time of investment or will be preferred stocks of issuers of investment-grade senior debt, some of which may have speculative characteristics, or, if not rated, will be of comparable quality as determined by the Adviser. The Fund will invest in common stocks of issuers whose senior debt is rated investment-grade or, in the case of issuers that have no rated senior debt outstanding, whose senior debt is considered by the Adviser to be of comparable quality. This revised policy supersedes the requirement that at least 80% of the Fund's total assets consist of preferred stocks and debt obligations rated "A" or higher and dividend-paying common stocks whose issuers have senior debt rated "A" or higher. On November 20, 2001, the Fund's Trustees approved the following investment policy investment restriction change, effective December 15, 2001. Under normal circumstances, the Fund will invest at least 80% of its assets in dividend-paying securities. The "Assets" are defined as net assets, including the liquidation preference amount of the DARTS, plus borrowings for investment purposes. The Fund will notify shareholders at least 60 days prior to any change in this 80% investment policy. By-laws In November 2002, the Board of Trustees adopted several amendments to the Fund's by-laws, including provisions relating to the calling of a special meeting and requiring advance notice of shareholder proposals or nominees for Trustee. The advance notice provisions in the by-laws require shareholders to notify the Fund in writing of any proposal that they intend to present at an annual meeting of shareholders, including any nominations for Trustee, between 90 and 120 days prior to the first anniversary of the mailing date of the notice from the prior year's annual meeting of shareholders. The notification must be in the form prescribed by the by-laws. The advance notice provisions provide the Fund and its Trustees with the opportunity to thoughtfully consider and address the matters proposed before the Fund prepares and mails its proxy statement to shareholders. Other amendments set forth the procedures that must be followed in order for a shareholder to call a special meeting of shareholders. Please contact the Secretary of the Fund for additional information about the advance notice requirements or the other amendments to the by-laws. On December 16, 2003, the Trustees approved the following change to the Fund's by-laws. The auction preferred section of the Fund's by-laws was changed to update the rating agency requirements, in keeping with recent changes to the agencies' basic maintenance reporting requirements for leveraged closed-end funds. By-laws now require an independent accountant's confirmation only once per year, at the Fund's fiscal year end, and changes to the agencies' basic maintenance reporting requirements that include modifications to 18 the eligible assets and their respective discount factors. These revisions bring the Fund's by-laws in line with current rating agency requirements. On September 14, 2004, the Trustees approved an amendment to the Fund's by-laws increasing the maximum applicable dividend rate ceiling on the preferred shares to conform with the modern calculation methodology used by the industry and other John Hancock funds. Dividend reinvestment plan The Fund offers its shareholders a Dividend Rein vestment Plan (the "Plan"), which offers the opportunity to earn compounded yields. Each holder of common shares will automatically have all distributions of dividends and capital gains reinvested by Mellon Investor Services, as Plan agent for the common shareholders (the "Plan Agent"), unless an election is made to receive cash. Holders of common shares who elect not to participate in the Plan will receive all distributions in cash, paid by check mailed directly to the shareholder of record (or if the common shares are held in street or other nominee name, then to the nominee) by the Plan Agent, as dividend-disbursing agent. Shareholders whose shares are held in the name of a broker or a nominee should contact the broker or nominee to determine whether and how they may participate in the Plan. If the Fund declares a dividend payable either in common shares or in cash, non-participants will receive cash and participants in the Plan will receive the equivalent in common shares. If the market price of the common shares on the payment date of the dividend is equal to or exceeds their net asset value as determined on the payment date, participants will be issued common shares (out of authorized but unissued shares) at a value equal to the higher of net asset value or 95% of the market price. If the net asset value exceeds the market price of the common shares at such time, or if the Board of Trustees declares a dividend payable only in cash, the Plan Agent will, as agent for Plan participants, buy shares in the open market, on the New York Stock Exchange or elsewhere, for the participant's accounts. Such purchases will be made promptly after the payable date for such dividend and, in any event, prior to the next ex-dividend date after such date, except where necessary to comply with federal securities laws. If, before the Plan Agent has completed its purchases, the market price exceeds the net asset value of the common shares, the average per share purchase price paid by the Plan Agent may exceed the net asset value of the common shares, resulting in the acquisition of fewer shares than if the dividend had been paid in shares issued by the Fund. Each participant will pay a pro rata share of brokerage commissions incurred with respect to the Plan Agent's open market purchases in connection with the reinvestment of dividends and distributions. The cost per share of the shares purchased for each participant's account will be the average cost, including brokerage commissions, of any shares purchased on the open market plus the cost of any shares issued by the Fund. There will be no brokerage charges with respect to common shares issued directly by the Fund. There are no other charges to participants for reinvesting dividends or capital gain distributions. Participants in the Plan may withdraw from the Plan at any time by contacting the Plan Agent by telephone, in writing or by visiting the Plan Agent's Web site at www.melloninvestor.com. Such withdrawal will be effective immediately if received prior to a dividend record date; otherwise, it will be effective for all subsequent dividend record dates. When a participant withdraws from the Plan or upon termination of the Plan, as provided below, certificates 19 for whole common shares credited to his or her account under the Plan will be issued and a cash payment will be made for any fraction of a share credited to such account. The Plan Agent maintains each shareholder's account in the Plan and furnishes monthly written confirmations of all transactions in the accounts, including information needed by the shareholders for personal and tax records. The Plan Agent will hold common shares in the account of each Plan participant in non-certificated form in the name of the participant. Proxy material relating to the shareholders' meetings of the Fund will include those shares purchased, as well as shares held pursuant to the Plan. The reinvestment of dividends and distributions will not relieve participants of any federal income tax that may be payable or required to be withheld on such dividends or distributions. Participants under the Plan will receive tax information annually. The amount of dividend to be reported on 1099-DIV should be: (1) in the case of shares issued by the Fund, the fair market value of such shares on the dividend payment date and (2) in the case of shares purchased by the Plan Agent in the open market, the amount of cash used by the Plan Agent to purchase shares in the open market, including the amount of cash allocated to brokerage commissions paid on such purchases. Experience under the Plan may indicate that changes are desirable. Accordingly, the Fund reserves the right to amend or terminate the Plan as applied to any dividend or distribution paid subsequent to written notice of the change sent to all shareholders of the Fund at least 90 days before the record date for the dividend or distribution. The Plan may be amended or terminated by the Plan Agent after at least 90 days written notice to all shareholders of the Fund. All correspondence or additional information concerning the Plan should be directed to the Plan Agent, Mellon Bank, N.A., c/o Mellon Investor Services, P.O. Box 3338, South Hackensack, NJ 07606-1938 (telephone 1-800-852-0218). Shareholder communication and assistance If you have any questions concerning the Fund, we will be pleased to assist you. If you hold shares in your own name and not with a brokerage firm, please address all notices, correspondence, questions or other communications regarding the Fund to the transfer agent at: Mellon Investor Services 85 Challenger Road Overpeck Centre Ridgefield Park, NJ 07660 Telephone 1-800-852-0218 If your shares are held with a brokerage firm, you should contact that firm, bank or other nominee for assistance. 20 Shareholder meeting On March 7, 2005, the Annual Meeting of the Fund was held to elect four Trustees and to ratify the actions of the Trustees in selecting independent auditors for the Fund. Proxies covering 12,639,827 shares of beneficial interest were voted at the meeting. The common shareholders elected the following Trustees to serve until their respective successors are duly elected and qualified, with the votes tabulated as follows: WITHHELD FOR AUTHORITY ---------------------------------------------------------------------- James F. Carlin 12,410,128 229,277 William H. Cunningham 12,386,478 252,927 Richard P. Chapman, Jr. 12,378,089 261,316 James A. Shepherdson 12,406,742 232,663 The preferred shareholders elected Patti McGill Peterson as a Trustee of the Fund until her successor is duly elected and qualified, with the votes tabulated as follows: 422 FOR, 0 AGAINST and 0 ABSTAINING. The common and preferred shareholders also ratified the Trustees' selection of Deloitte & Touche LLP as the Fund's independent auditors for the fiscal year ending September 30, 2005, with the votes tabulated as follows: 12,452,836 FOR, 79,986 AGAINST and 107,005 ABSTAINING. 21 22 23 24 For more information The Fund's proxy voting policies, procedures and records are available without charge, upon request: By phone On the Fund's Web site On the SEC's Web site 1-800-225-5291 www.jhfunds.com/proxy www.sec.gov Trustees Charles L. Ladner, Chairman* James F. Carlin Richard P. Chapman, Jr.* William H. Cunningham Ronald R. Dion Dr. John A. Moore* Patti McGill Peterson* Steven R. Pruchansky James A. Shepherdson Lt. Gen. Norman H. Smith, USMC (Ret.) * Members of the Audit Committee Officers James A. Shepherdson President and Chief Executive Officer William H. King Vice President and Treasurer Investment adviser John Hancock Advisers, LLC 101 Huntington Avenue Boston, MA 02199-7603 Custodian The Bank of New York One Wall Street New York, NY 10286 Transfer agent and dividend disburser Mellon Investor Services 85 Challenger Road Overpeck Centre Ridgefield Park, NJ 07660 Transfer agent for DARTS Deutsche Bank Trust Company Americas 280 Park Avenue New York, NY 10017 Legal counsel Wilmer Cutler Pickering Hale and Dorr LLP 60 State Street Boston, MA 02109-1803 Stock symbol Listed New York Stock Exchange: PDF For shareholder assistance refer to page 20 How to contact us Internet www.jhfunds.com Mail Regular mail: Mellon Investor Services 85 Challenger Road Overpeck Centre Ridgefield Park, NJ 07660 Phone Customer service representatives 1-800-852-0218 Portfolio commentary 1-800-344-7054 24-hour automated information 1-800-843-0090 TDD line 1-800-231-5469 A listing of month-end portfolio holdings is available on our Web site, www.jhfunds.com. A more detailed portfolio holdings summary is available on a quarterly basis 60 days after the fiscal quarter on our Web site or upon request by calling 1-800-225-5291, or on the Securities and Exchange Commission's Web site, www.sec.gov. 25 [A 1 1/2" x 1/2" John Hancock (Signature) logo in upper left hand corner. A tag line below reads "JOHN HANCOCK FUNDS."] 1-800-852-0218 1-800-843-0090 EASI-Line 1-800-231-5469 (TDD) www.jhfunds.com --------------- PRESORTED STANDARD U. S. POSTAGE PAID MIS --------------- P10SA 3/05 5/05 ITEM 2. CODE OF ETHICS. As of the end of the period, March 31, 2005, the registrant has adopted a code of ethics, as defined in Item 2 of Form N-CSR, that applies to its Chief Executive Officer, Chief Financial Officer and Treasurer (respectively, the principal executive officer, the principal financial officer and the principal accounting officer, the "Senior Financial Officers"). A copy of the code of ethics is filed as an exhibit to this Form N-CSR. The code of ethics was amended effective February 1, 2005 to address new Rule 204A-1 under the Investment Advisers Act of 1940 and to make other related changes. The most significant amendments were: (a) Broadening of the General Principles of the code to cover compliance with all federal securities laws. (b) Eliminating the interim requirements (since the first quarter of 2004) for access persons to preclear their personal trades of John Hancock mutual funds. This was replaced by post-trade reporting and a 30 day hold requirement for all employees. (c) A new requirement for "heightened preclearance" with investment supervisors by any access person trading in a personal position worth $100,000 or more. ITEM 3. AUDIT COMMITTEE FINANCIAL EXPERT. Not applicable at this time. ITEM 4. PRINCIPAL ACCOUNTANT FEES AND SERVICES. Not applicable at this time. ITEM 5. AUDIT COMMITTEE OF LISTED REGISTRANTS. Not applicable at this time. ITEM 6. SCHEDULE OF INVESTMENTS. Not applicable. ITEM 7. DISCLOSURE OF PROXY VOTING POLICIES AND PROCEDURES FOR CLOSED-END MANAGEMENT INVESTMENT COMPANIES. Not applicable. ITEM 8. PORTFOLIO MANAGERS OF CLOSED-END MANAGEMENT INVESTMENT COMPANIES. Not applicable. 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. (a) The registrant has adopted procedures by which shareholders may recommend nominees to the registrant's Board of Trustees. A copy of the procedures is filed as an exhibit to this Form N-CSR. See attached "John Hancock Funds - Administration Committee Charter" and "John Hancock Funds - Governance Committee Charter". ITEM 11. CONTROLS AND PROCEDURES. (a) Based upon their evaluation of the registrant's disclosure controls and procedures as conducted within 90 days of the filing date of this Form N-CSR, the registrant's principal executive officer and principal financial officer have concluded that those disclosure controls and procedures provide reasonable assurance that the material information required to be disclosed by the registrant on this report is recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission's rules and forms. (b) There were no changes in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal half-year (the registrant's second fiscal half-year in the case of an annual report) that have materially affected, or are reasonably likely to materially affect, the registrant's internal control over financial reporting. ITEM 12. EXHIBITS. (a)(1) Code of Ethics for Senior Financial Officers is attached. (a)(2) Separate certifications for the registrant's principal executive officer and principal financial officer, as required by Section 302 of the Sarbanes-Oxley Act of 2002 and Rule 30a-2(a) under the Investment Company Act of 1940, are attached. (b) Separate certifications for the registrant's principal executive officer and principal financial officer, as required by 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, and Rule 30a-2(b) under the Investment Company Act of 1940, are attached. The certifications furnished pursuant to this paragraph are not deemed to be "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, or otherwise subject to the liability of that section. Such certifications are not deemed to be incorporated by reference into any filing under the Securities Act of 1933 or the Securities Exchange Act of 1934, except to the extent that the Registrant specifically incorporates them by reference. (c)(1) Submission of Matters to a Vote of Security Holders is attached. See attached "John Hancock Funds - Administration Committee Charter" and "John Hancock Funds - Governance Committee Charter". (c)(2) Contact person at the registrant. SIGNATURES 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. John Hancock Patriot Premium Dividend Fund I By: ------------------------------ James A. Shepherdson President and Chief Executive Officer Date: May 25, 2005 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: ------------------------------ James A. Shepherdson President and Chief Executive Officer Date: May 25, 2005 By: ------------------------------ William H. King Vice President and Treasurer Date: May 25, 2005