Title of Each Class of Securities Offered

Maximum Aggregate Offering Price

Amount of Registration Fee

Notes

Pricing supplement no. 24

To prospectus dated November 7, 2014,

prospectus supplement dated November 7, 2014 and

product supplement no. 4a-I dated November 7, 2014

Registration Statement No. 333-199966

Dated November 18, 2014

Rule 424(b)(2)

$1,000,000

12.40% per annum Upside Auto Callable Reverse Exchangeable Notes due November 20, 2015 Linked to the Common Stock of Twitter, Inc.

The notes are designed for investors who seek a higher interest rate than either the current dividend yield on the Reference Stock or the yield on a conventional debt security with the same maturity issued by us. Investors should be willing to forgo the potential to participate in the appreciation of the Reference Stock, to accept the risks of owning equities in general and the common stock of Twitter, Inc., in particular, to assume the risk that the notes will be automatically called and the investors will receive less interest than if the notes are not automatically called and, if the notes are not automatically called, to lose some or all of their principal at maturity.

The notes will pay 12.40% per annum interest over the term of the notes, assuming no automatic call, payable at a rate of 1.03333% per month. However, the notes do not guarantee any return of principal at maturity. Instead, if the notes are not automatically called, the payment at maturity will be based on the Final Stock Price of one share of the Reference Stock and whether the trading price of one share of the Reference Stock is less than the Stock Strike Price by more than the Buffer Amount at any time during the Monitoring Period, as described below. If the notes are automatically called, you will receive, for each $1,000 principal amount note, $1,000 plus accrued and unpaid interest.

The notes are unsecured and unsubordinated obligations of JPMorgan Chase & Co. Any payment on the notes is subject to the credit risk of JPMorgan Chase & Co.

The notes priced on November 18, 2014 and are expected to settle on or about November 21, 2014. The Pricing Date, for purposes of these notes, is the day that the terms of the notes become final. The Stock Strike Price has been determined by reference to the closing price of the Reference Stock on November 17, 2014 and not by reference to the closing price of the Reference Stock on the Pricing Date.

If the notes are not automatically called, payment at maturity for each $1,000 principal amount note will be either a cash payment of $1,000 or delivery of shares of the Reference Stock (or, at our election, the Cash Value), in each case, together with any accrued and unpaid interest, as described below.

Minimum denominations of $1,000 and integral multiples thereof

— 12.40% per annum if the notes are not automatically called; or

— if the notes are automatically called:

— 6.20000% if the notes are automatically called on the first Call Date;

— 7.23333% if the notes are automatically called on the second Call Date;

— 8.26667% if the notes are automatically called on the third Call Date;

— 9.30000% if the notes are automatically called on the fourth Call Date;

— 10.33333% if the notes are automatically called on the fifth Call Date;

— 11.36667% if the notes are automatically called on the final Call Date;

in each case equivalent to 12.40% per annum, payable at a rate of 1.03333% per month

If the notes have not been automatically called, the payment at maturity, in excess of any accrued and unpaid interest, will be based on the performance of the Reference Stock. If the notes are not automatically called, for each $1,000 principal amount note, you will receive $1,000 plus any accrued and unpaid interest at maturity, unless:

(1) the Final Stock Price is less than the Stock Strike Price;

and

(2) at any time during the Monitoring Period, the trading price of one share of the Reference Stock is less than the Stock Strike Price by more than the Buffer Amount.

If the notes have not been automatically called and the conditions described in both (1) and (2) are satisfied, at maturity you will receive, in addition to any accrued and unpaid interest, instead of the principal amount of your notes, the number of shares of the Reference Stock equal to the Physical Delivery Amount (or, at our election, the Cash Value). Fractional shares will be paid in cash. The market value of the Physical Delivery Amount or the Cash Value will most likely be substantially less than the principal amount of your notes, and may be zero.

Per note

Total

Product supplement no. 4a-I dated November 7, 2014:

Prospectus supplement and prospectus, each dated November 7, 2014:

THE NOTES OFFER A HIGHER INTEREST RATE THAN THE YIELD ON DEBT SECURITIES OF COMPARABLE MATURITY ISSUED BY US — The notes will pay interest at the Interest Rate specified on the cover of this pricing supplement, which is higher than the yield currently available on debt securities of comparable maturity issued by us. Because the notes are our unsecured and unsubordinated obligations, any interest payment or any payment at maturity is subject to our ability to pay our obligations as they become due.

MONTHLY INTEREST PAYMENTS — The notes offer monthly interest payments as specified on the cover of this pricing supplement. Interest will be payable to the holders of record at the close of business on the business day immediately preceding the applicable Interest Payment Date or applicable Call Settlement Date. If an Interest Payment Date is not a business day, payment will be made on the next business day immediately following such day, but no additional interest will accrue as a result of the delayed payment.

POTENTIAL EARLY EXIT AS A RESULT OF THE AUTOMATIC CALL FEATURE — If the closing price of one share of the Reference Stock is greater than or equal to the Stock Strike Price on any of the Call Dates, your notes will be automatically called prior to the Maturity Date. Under these circumstances, on the applicable Call Settlement Date, for each $1,000 principal amount note, you will receive $1,000 plus accrued and unpaid interest to but excluding the applicable Call Settlement Date.

THE NOTES DO NOT GUARANTEE THE RETURN OF YOUR PRINCIPAL IF THE NOTES HAVE NOT BEEN AUTOMATICALLY CALLED — If the notes have not been automatically called, we will pay you your principal back at maturity so long as the Final Stock Price is not less than the Stock Strike Price or the trading price of one share of the Reference Stock is not less than the Stock Strike Price by more than the Buffer Amount at all times during the Monitoring Period. However, if the notes have not been automatically called, the Final Stock Price is less than the Stock Strike Price and the trading price of one share of the Reference Stock at any time during the Monitoring Period is less than the Stock Strike Price by more than the Buffer Amount, you could lose the entire principal amount of your notes.

TAX TREATMENT AS A UNIT COMPRISING A PUT OPTION AND A DEPOSIT — You should review carefully the section entitled “Material U.S. Federal Income Tax Consequences” in the accompanying product supplement no. 4a-I. Based on the advice of Davis Polk & Wardwell LLP, our special tax counsel, and on current market conditions, in determining our reporting responsibilities we intend to treat the notes for U.S. federal income tax purposes as units each comprising: (x) a put option written by you that is terminated if an Automatic Call occurs and that, if not terminated, requires you to purchase the Reference Stock (or, at our option, receive the Cash Value thereof) from us at maturity for an amount equal to the

JPMorgan Structured Investments —

Upside Auto Callable Reverse Exchangeable Notes Linked to the Common Stock of Twitter, Inc.

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deposit under circumstances where the payment due at maturity is the Physical Delivery Amount (or the Cash Value thereof) and (y) a deposit of $1,000 per $1,000 principal amount note to secure your potential obligation under the put option, as more fully described in “Material U.S. Federal Income Tax Consequences — Notes Treated as Units Each Comprising a Put Option and a Deposit” in the accompanying product supplement no. 4a-I. By purchasing the notes, you agree (in the absence of an administrative determination or judicial ruling to the contrary) to follow this treatment and the allocation described in the following paragraph. However, there are other reasonable treatments that the Internal Revenue Service (the “IRS”) or a court may adopt, in which case the timing and character of any income or loss on the notes could be materially and adversely affected. In addition, in 2007 Treasury and the IRS released a notice requesting comments on the U.S. federal income tax treatment of “prepaid forward contracts” and similar instruments. The notice focuses on a number of issues, the most relevant of which for investors in the notes are the character of income or loss (including whether the put premium might be currently included as ordinary income) and the degree, if any, to which income realized by non-U.S. investors should be subject to withholding tax. While it is not clear whether the notes would be viewed as similar to the typical prepaid forward contract described in the notice, it is possible that any Treasury regulations or other guidance promulgated after consideration of these issues could materially and adversely affect the tax consequences of an investment in the notes, possibly with retroactive effect.

YOUR INVESTMENT IN THE NOTES MAY RESULT IN A LOSS — The notes do not guarantee any return of principal. If the notes have not been automatically called, the payment at maturity will be based on the Final Stock Price and whether the trading price of one share of the Reference Stock is less than the Stock Strike Price by more than the Buffer Amount at any time during the Monitoring Period. Under certain circumstances, you will receive at maturity a predetermined number of shares of the Reference Stock (or, at our election, the Cash Value). The market value of those shares of the Reference Stock or the Cash Value will most likely be less than the principal amount of each note and may be zero. Accordingly, you could lose up to the entire principal amount of your notes.

THE AUTOMATIC CALL FEATURE MAY FORCE A POTENTIAL EARLY EXIT — The notes will be automatically called before maturity if the closing price of one share of the Reference Stock is greater than or equal to the Stock Strike Price on any of the Call Dates. Under these circumstances, the amount of interest payable on the notes will be less than the full amount of interest that would have been payable if the notes were held to maturity, and, for each $1,000 principal amount note, you will receive $1,000 plus accrued and unpaid interest to but excluding the applicable Call Settlement Date.

THE BENEFIT PROVIDED BY THE BUFFER AMOUNT MAY TERMINATE AT ANY TIME DURING THE TERM OF THE NOTES — If the notes have not been automatically called and, at any time during the Monitoring Period, the trading price of one share of the Reference Stock is less than the Stock Strike Price minus the Buffer Amount, you will be fully exposed to any depreciation in the Reference Stock. We refer to this feature as a contingent buffer. Under these circumstances, and if the Final Stock Price is less than the Stock Strike Price, you will receive at maturity a predetermined number of shares of Reference Stock (or, at our election, the Cash Value) and, consequently, you will lose 1% of the principal amount of your investment for every 1% that the Final Stock Price is less than the Stock Strike Price. You will be subject to this potential loss of principal even if the trading price of one share of the Reference Stock subsequently recovers such that it is greater than the Stock Strike Price minus the Buffer Amount. If these notes had a non-contingent buffer feature, under the same scenario, you would have received the full principal amount of your notes plus accrued and unpaid interest at maturity. As a result, your investment in the notes may not perform as well as an investment in a security with a return that includes a non-contingent buffer.

CREDIT RISK OF JPMORGAN CHASE & CO. — The notes are subject to the credit risk of JPMorgan Chase & Co., and our credit ratings and credit spreads may adversely affect the market value of the notes. Investors are dependent on JPMorgan Chase & Co.’s ability to pay all amounts due on the notes. Any actual or potential change in our creditworthiness or credit spreads, as determined by the market for taking our credit risk, is likely to adversely affect the value of the notes. If we were to default on our

JPMorgan Structured Investments —

Upside Auto Callable Reverse Exchangeable Notes Linked to the Common Stock of Twitter, Inc.

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payment obligations, you may not receive any amounts owed to you under the notes and you could lose your entire investment.

POTENTIAL CONFLICTS — We and our affiliates play a variety of roles in connection with the issuance of the notes, including acting as calculation agent and as an agent of the offering of the notes, hedging our obligations under the notes and making the assumptions used to determine the pricing of the notes and the estimated value of the notes when the terms of the notes are set, which we refer to as JPMS’s estimated value. In performing these duties, our economic interests and the economic interests of the calculation agent and other affiliates of ours are potentially adverse to your interests as an investor in the notes. In addition, our business activities, including hedging and trading activities, could cause our economic interests to be adverse to yours and could adversely affect any payment on the notes and the value of the notes. It is possible that hedging or trading activities of ours or our affiliates in connection with the notes could result in substantial returns for us or our affiliates while the value of the notes declines. Please refer to “Risk Factors — Risks Relating to Conflicts of Interest” in the accompanying product supplement no. 4a-I for additional information about these risks.

REINVESTMENT RISK — If your notes are automatically called early, the term of the notes may be reduced to as short as approximately six months and you will not receive interest payments after the applicable Call Settlement Date. There is no guarantee that you would be able to reinvest the proceeds from an investment in the notes at a comparable return and/or with a comparable interest rate for a similar level of risk in the event the notes are automatically called prior to the Maturity Date.

SINGLE STOCK RISK — The price of the Reference Stock can fall sharply due to factors specific to the Reference Stock and its issuer, such as stock price volatility, earnings, financial conditions, corporate, industry and regulatory developments, management changes and decisions and other events, as well as general market factors, such as general stock market volatility and levels, interest rates and economic and political conditions.

JPMS’S ESTIMATED VALUE OF THE NOTES IS LOWER THAN THE ORIGINAL ISSUE PRICE (PRICE TO PUBLIC) OF THE NOTES — JPMS’s estimated value is only an estimate using several factors. The original issue price of the notes exceeds JPMS’s estimated value because costs associated with selling, structuring and hedging the notes are included in the original issue price of the notes. These costs include the selling commissions, the projected profits that our affiliates expect to realize for assuming risks inherent in hedging our obligations under the notes and the estimated cost of hedging our obligations under the notes. See “JPMS’s Estimated Value of the Notes” in this pricing supplement.

JPMS’S ESTIMATED VALUE DOES NOT REPRESENT FUTURE VALUES OF THE NOTES AND MAY DIFFER FROM OTHERS’ ESTIMATES — JPMS’s estimated value of the notes is determined by reference to JPMS’s internal pricing models when the terms of the notes are set. This estimated value is based on market conditions and other relevant factors existing at that time and JPMS’s assumptions about market parameters, which can include volatility, dividend rates, interest rates and other factors. Different pricing models and assumptions could provide valuations for notes that are greater than or less than JPMS’s estimated value. In addition, market conditions and other relevant factors in the future may change, and any assumptions may prove to be incorrect. On future dates, the value of the notes could change significantly based on, among other things, changes in market conditions, our creditworthiness, interest rate movements and other relevant factors, which may impact the price, if any, at which JPMS would be willing to buy notes from you in secondary market transactions. See “JPMS’s Estimated Value of the Notes” in this pricing supplement.

JPMS’S ESTIMATED VALUE IS NOT DETERMINED BY REFERENCE TO CREDIT SPREADS FOR OUR CONVENTIONAL FIXED-RATE DEBT — The internal funding rate used in the determination of JPMS’s estimated value generally represents a discount from the credit spreads for our conventional fixed-rate debt. The discount is based on, among other things, our view of the funding value of the notes as well as the higher issuance, operational and ongoing liability management costs of the notes in comparison to those costs for our conventional fixed-rate debt. If JPMS were to use the interest rate implied by our conventional fixed-rate credit spreads, we would expect the economic terms of the notes to be more favorable to you. Consequently, our use of an internal funding rate would have an adverse effect on the terms of the notes and any secondary market prices of the notes. See “JPMS’s Estimated Value of the Notes” in this pricing supplement.

THE VALUE OF THE NOTES AS PUBLISHED BY JPMS (AND WHICH MAY BE REFLECTED ON CUSTOMER ACCOUNT STATEMENTS) MAY BE HIGHER THAN JPMS’S THEN-CURRENT ESTIMATED VALUE OF THE NOTES FOR A LIMITED TIME PERIOD — We generally expect that some of the costs included in the original issue price of the notes will be partially paid back to you in connection with any repurchases of your notes by JPMS in an amount that will decline to zero over an initial predetermined period. These costs can include projected hedging profits , if any, and, in some

JPMorgan Structured Investments —

Upside Auto Callable Reverse Exchangeable Notes Linked to the Common Stock of Twitter, Inc.

PS-3        

circumstances, estimated hedging costs and our secondary market credit spreads for structured debt issuances. See “Secondary Market Prices of the Notes” in this pricing supplement for additional information relating to this initial period. Accordingly, the estimated value of your notes during this initial period may be lower than the value of the notes as published by JPMS (and which may be shown on your customer account statements).

SECONDARY MARKET PRICES OF THE NOTES WILL LIKELY BE LOWER THAN THE ORIGINAL ISSUE PRICE OF THE NOTES — Any secondary market prices of the notes will likely be lower than the original issue price of the notes because, among other things, secondary market prices take into account our secondary market credit spreads for structured debt issuances and, also, because secondary market prices (a) exclude selling commissions and (b) may exclude projected hedging profits, if any, and estimated hedging costs that are included in the original issue price of the notes. As a result, the price, if any, at which JPMS will be willing to buy notes from you in secondary market transactions, if at all, is likely to be lower than the original issue price. Any sale by you prior to the Maturity Date could result in a substantial loss to you. See the immediately following risk consideration for information about additional factors that will impact any secondary market prices of the notes.

SECONDARY MARKET PRICES OF THE NOTES WILL BE IMPACTED BY MANY ECONOMIC AND MARKET FACTORS — The secondary market price of the notes during their term will be impacted by a number of economic and market factors, which may either offset or magnify each other, aside from the selling commissions, projected hedging profits, if any, estimated hedging costs and the closing price and the trading price of one share of the Reference Stock, including:

any actual or potential change in our creditworthiness or credit spreads;

customary bid-ask spreads for similarly sized trades;

secondary market credit spreads for structured debt issuances;

the actual and expected volatility in the price of the Reference Stock;

the time to maturity of the notes;

whether the trading price of one share of the Reference Stock has been, or is expected to be, less than the Stock Strike Price by more than the Buffer Amount during the Monitoring Period;

the likelihood of an automatic call being triggered;

the dividend rate on the Reference Stock;

interest and yield rates in the market generally

the occurrence of certain events affecting the issuer of the Reference Stock that may or may not require an adjustment to the Stock Adjustment Factor, including a merger or acquisition; and

a variety of other economic, financial, political, regulatory and judicial events.

BUFFER AMOUNT APPLIES ONLY IF YOU HOLD THE NOTES TO MATURITY — Assuming the notes have not been automatically called, we will pay you your principal back at maturity only if the trading price of one share of the Reference Stock is not below the Stock Strike Price by more than the Buffer Amount at all times during the Monitoring Period or the Final Stock Price is equal to or greater than the Stock Strike Price. If the notes have not been automatically called and the trading price of one share of the Reference Stock is less than the Stock Strike Price by more than the Buffer Amount at any time during the Monitoring Period, the benefit provided by the Buffer Amount will be eliminated and you will be fully exposed at maturity to any decline in the market price of the Reference Stock.

VOLATILITY RISK — Greater expected volatility with respect to the Reference Stock indicates a greater likelihood as of the Pricing Date that the Reference Stock could trade below the Stock Strike Price by more than the Buffer Amount at any time during the Monitoring Period. The Reference Stock’s volatility, however, can change significantly over the term of the notes. The trading price of one share of the Reference Stock could fall sharply at any time during the Monitoring Period, which could result in a significant loss of principal.

YOUR RETURN ON THE NOTES IS LIMITED TO THE PRINCIPAL AMOUNT PLUS ACCRUED INTEREST REGARDLESS OF ANY APPRECIATION IN THE VALUE OF THE REFERENCE STOCK — If the notes have not been automatically called, unless (i) the Final Stock Price is below the Stock Strike Price and (ii) at any time during the Monitoring Period, the trading price of one share of the Reference Stock is less than the Stock Strike Price by more than the Buffer Amount, for each $1,000 principal amount note, you will receive $1,000 at maturity plus any accrued and unpaid interest, regardless of any appreciation in the value of the Reference Stock, which may be significant. If the notes are automatically called, for each $1,000 principal amount note, you will receive $1,000 on the applicable Call Settlement Date plus any accrued and unpaid interest, regardless of the appreciation in the value of the Reference Stock, which may be significant. Accordingly, the return on the notes may be significantly less than the return on a direct investment in the Reference Stock during the term of the notes.

NO OWNERSHIP RIGHTS IN THE REFERENCE STOCK — As a holder of the notes, you will not have

JPMorgan Structured Investments —

Upside Auto Callable Reverse Exchangeable Notes Linked to the Common Stock of Twitter, Inc.

PS-4        

any ownership interest or rights in the Reference Stock, such as voting rights or dividend payments. In addition, the Reference Stock issuer will not have any obligation to consider your interests as a holder of the notes in taking any corporate action that might affect the value of the Reference Stock and the notes.

NO AFFILIATION WITH TWITTER — We are not affiliated with Twitter. We have not independently verified any of the information about Twitter contained in this pricing supplement. You should undertake your own investigation into the Reference Stock and Twitter. We are not responsible for Twitter’s public disclosure of information, whether contained in SEC filings or otherwise.

LACK OF LIQUIDITY — The notes will not be listed on any securities exchange. JPMS intends to offer to purchase the notes in the secondary market but is not required to do so. Even if there is a secondary market, it may not provide enough liquidity to allow you to trade or sell the notes easily. Because other dealers are not likely to make a secondary market for the notes, the price at which you may be able to trade your notes is likely to depend on the price, if any, at which JPMS is willing to buy the notes.

THE ANTI-DILUTION PROTECTION FOR THE REFERENCE STOCK IS LIMITED AND MAY BE DISCRETIONARY — The calculation agent will make adjustments to the Stock Adjustment Factor for certain corporate events affecting the Reference Stock. However, the calculation agent will not make an adjustment in response to all events that could affect the Reference Stock. If an event occurs that does not require the calculation agent to make an adjustment, the value of the notes may be materially and adversely affected. You should also be aware that the calculation agent may make adjustments in response to events that are not described in the accompanying product supplement to account for any diluting or concentrative effect, but the calculation agent is under no obligation to do so or to consider your interests as a holder of the notes in making these determinations.

LIMITED TRADING HISTORY — The Reference Stock commenced trading on the New York Stock Exchange on November 7, 2013 and therefore has limited historical performance. Accordingly, historical information for the Reference Stock is available only since that date. Past performance should not be considered indicative of future performance.

JPMorgan Structured Investments —

Upside Auto Callable Reverse Exchangeable Notes Linked to the Common Stock of Twitter, Inc.

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JPMorgan Structured Investments —

Upside Auto Callable Reverse Exchangeable Notes Linked to the Common Stock of Twitter, Inc.

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First

Second

Third

Fourth

Fifth

Final

JPMorgan Structured Investments —

Upside Auto Callable Reverse Exchangeable Notes Linked to the Common Stock of Twitter, Inc.

PS-7        

JPMorgan Structured Investments —

Upside Auto Callable Reverse Exchangeable Notes Linked to the Common Stock of Twitter, Inc.

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JPMorgan Structured Investments —

Upside Auto Callable Reverse Exchangeable Notes Linked to the Common Stock of Twitter, Inc.

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