JPMorgan Chase & Co. Buffered Autocallable Optimization Securities

$4,339,480 Linked to the SPDR^® S&P 500^® ETF Trust due on January 6, 2014

The Securities are not bank deposits and are not insured by the Federal Deposit Insurance Corporation or any other governmental agency, nor are they obligations of, or guaranteed by, a bank.

Additional Information about JPMorgan Chase & Co. and the Securities

You should read this amended and restated pricing supplement together with the prospectus dated November 14, 2011, as supplemented by the prospectus supplement dated November 14, 2011, relating to our Series E medium-term notes of which these Securities are a part, and the more detailed information contained in product supplement no. UBS-7-II dated September 19, 2012 and underlying supplement no. 1-I dated November 14, 2011. This amended and restated pricing supplement, together with the documents listed below, contains the terms of the Securities, supplements the free writing prospectus related hereto dated December 20, 2012 and supersedes all other prior or contemporaneous oral statements as well as any other written materials including preliminary or indicative pricing terms, correspondence, trade ideas, structures for implementation, sample structures, fact sheets, brochures or other educational materials of ours. This amended and restated pricing supplement amends and restates and supersedes the pricing supplement no. 956 related hereto dated December 27, 2012 to product supplement no. UBS-7-II in its entirety. You should rely only on the information contained in this amended and restated pricing supplement and in the documents listed below in making your decision to invest in the notes. You should carefully consider, among other things, the matters set forth in "Risk Factors" in the accompanying product supplement no. UBS-7-II and "Risk Factors" in the accompanying underlying supplement no. 1-I, as the Securities involve risks not associated with conventional debt securities.

You may access these on the SEC website at www.sec.gov as follows (or if such address has changed, by reviewing our filing for the relevant date on the SEC website):

As used in this amended and restated pricing supplement, the "issuer," "we," "us" and "our" refer to JPMorgan Chase & Co.

Investor Suitability

The suitability considerations identified above are not exhaustive. Whether or not the Securities are a suitable investment for you will depend on your individual circumstances, and you should reach an investment decision only after you and your investment, legal, tax, accounting and other advisers have carefully considered the suitability of an investment in the Securities in light of your particular circumstances. You should also review carefully the "Key Risks" beginning on page 6 of this amended and restated pricing supplement, "Risk Factors" in the accompanying product supplement no. UBS-7-II and "Risk Factors" in the accompanying underlying supplement no. 1-I for risks related to an investment in the Securities.

What Are the Tax Consequences of the Securities?

You should review carefully the section entitled "Material U.S. Federal Income Tax Consequences" in the accompanying product supplement no. UBS-7-II. The following discussion, when read in combination with that section, constitutes the full opinion of our special tax counsel, Davis Polk & Wardwell LLP, regarding the material U.S. federal income tax consequences of owning and disposing of Securities.

Based on current market conditions, in the opinion of our special tax counsel it is reasonable to treat the Securities as "open transactions" that are not debt instruments for U.S. federal income tax purposes. Assuming this treatment is respected, the gain or loss on your Securities should be treated as short-term capital gain or loss unless you hold your Securities for more than a year, in which case the gain or loss should be long-term capital gain or loss, whether or not you are an initial purchaser of Securities at the issue price. However, the Internal Revenue Service (the "IRS") or a court may not respect this treatment of the Securities, in which case the timing and character of any income or loss on the Securities 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 in particular on whether to require investors in these instruments to accrue income over the term of their investment. It also asks for comments on a number of related topics, including the character of income or loss with respect to these instruments; the relevance of factors such as the nature of the underlying property to which the instruments are linked; the degree, if any, to which income (including any mandated accruals) realized by non-U.S. investors should be subject to withholding tax; and whether these instruments are or should be subject to the "constructive ownership" regime, which very generally can operate to recharacterize certain long-term capital gain as ordinary income and impose an interest charge. While the notice requests comments on appropriate transition rules and effective dates, 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 Securities, possibly with retroactive effect. You should consult your tax adviser regarding the U.S. federal income tax consequences of an investment in the Securities, including possible alternative treatments and the issues presented by this notice.

Non-U.S. Holders - Additional Tax Consideration

Non-U.S. Holders should note that recently proposed Treasury regulations, if finalized in their current form, could impose a withholding tax at a rate of 30% (subject to reduction under an applicable income tax treaty) on amounts attributable to U.S.-source dividends (including, potentially, adjustments to account for extraordinary dividends) that are paid or "deemed paid" after December 31, 2013 under certain financial instruments, if certain other conditions are met. While significant aspects of the application of these proposed regulations to the Securities are uncertain, if these proposed regulations were finalized in their current form, we (or other withholding agents) might determine that withholding is required with respect to Securities held by a Non-U.S. Holder or that the Non-U.S. Holder must provide information to establish that withholding is not required. Non-U.S. Holders should consult their tax advisers regarding the potential application of these proposed regulations. If withholding is required, we will not be required to pay any additional amounts with respect to amounts so withheld.

Key Risks

An investment in the Securities involves significant risks. Investing in the Securities is not equivalent to investing directly in the Fund. These risks are explained in more detail in the "Risk Factors" section of the accompanying product supplement no. UBS-7-II and the "Risk Factors" section of the accompanying underlying supplement no. 1-I. We also urge you to consult your investment, legal, tax, accounting and other advisors before you invest in the Securities.

Risks Relating to the Securities Generally

Risks Related to the Fund

Hypothetical Examples

The examples below illustrate the hypothetical payment upon a call or at maturity under different hypothetical scenarios for a $10.00 Security on an offering of the Securities based on the following information (amounts have been rounded for ease of reference):

Example 1 — Securities are Called on the First Observation Date

Because the Securities are called on the first Observation Date, we will pay you on the applicable Call Settlement Date a total Call Price of $10.35 per $10.00 principal amount (3.50% return on the Securities).

Example 2 — Securities are Called on the Final Valuation Date

Because the Securities are called on the Final Valuation Date, we will pay you on the applicable Call Settlement Date (which coincides with the Maturity Date in this example) a total Call Price of $10.70 per $10.00 principal amount (7.00% return on the Securities).

Example 3 — Securities are NOT Called and the percentage decline from the Initial Share Price to the Final Share Price does not exceed the Buffer Amount

Because the Securities are not called and the percentage decline from the Initial Share Price to the Final Share Price does not exceed the Buffer Amount, at maturity we will pay you a total of $10.00 per $10.00 principal amount (a 0% return on the Securities).

Example 4 — Securities are NOT Called and the percentage decline from the Initial Share Price to the Final Share Price exceeds the Buffer Amount

Because the Securities are not called and the percentage decline from the Initial Share Price to the Final Share Price exceeds the Buffer Amount, at maturity we will pay you a total of $5.50 per $10.00 principal amount (a 45% loss on the Securities).

The hypothetical returns and hypothetical payments on the securities shown above do not reflect fees or expenses that would be associated with any sale in the secondary market. If these fees and expenses were included, the hypothetical returns and hypothetical payments shown above would likely be lower.

The Fund

Included on the following pages is a brief description of the Fund. This information has been obtained from publicly available sources, without independent verification. Set forth below is a table that provides the quarterly high and low closing prices of one share of the Fund. The information given below is for the four calendar quarters in each of 2007, 2008, 2009, 2010 and 2011 and the first, second and third calendar quarters of 2012. Partial data is provided for the fourth calendar quarter of 2012. We obtained the closing price information set forth below from the Bloomberg Professional^® service ("Bloomberg"), without independent verification. You should not take the historical prices of the Fund as an indication of future performance.

The SPDR^® S&P 500^® ETF Trust

The SPDR^® S&P 500^® ETF Trust is a registered investment company whose Trust Units (which we refer to as "shares") represent an undivided ownership interest in a portfolio of all, or substantially all, of the common stocks of the S&P 500^® Index. The SPDR^® S&P 500^® ETF Trust's objective is to provide investment results that, before expenses, generally correspond to the price and yield performance of the S&P 500^® Index, which we refer to as the Underlying Index with respect to the SPDR^® S&P 500^® ETF Trust. The S&P 500^® Index consists of 500 component stock selected to provide a performance benchmark for the U.S. equity markets. Information provided to or filed with the SEC by the Fund pursuant to the Securities Act of 1933, as amended, and the Investment Company Act of 1940, as amended, can be located by reference to SEC file numbers 033-46080 and 811-06125, respectively, through the SEC's website at http://www.sec.gov. In addition, information about the SPDR^® S&P 500^® ETF Trust may be obtained from other sources including, but not limited to, press releases, newspaper articles and other publicly disseminated documents. For additional information about the SPDR^® S&P 500^® ETF Trust, see the information set forth under "Fund Descriptions — The SPDR^® S&P 500^® ETF Trust" in the accompanying underlying supplement no. 1-I.

Historical Information Regarding the SPDR^® S&P 500^® ETF Trust

The following table sets forth the quarterly high and low closing prices of one share of the SPDR^® S&P 500^® ETF Trust, based on daily closing prices as reported by Bloomberg, without independent verification. The closing price of one share of the Fund on December 27, 2012 was $141.59. We obtained the closing prices and other information below from Bloomberg, without independent verification. The closing prices and this other information may be adjusted by Bloomberg for certain actions such as stock splits.

Since its inception, the price of the Fund has experienced significant fluctuations. The historical performance of the Fund should not be taken as an indication of future performance, and no assurance can be given as to the closing prices of one share of the Fund during the term of the Securities. We cannot give you assurance that the performance of the Fund will result in the return of any of your initial investment at maturity in excess of the Buffer Amount, subject to the creditworthiness of JPMorgan Chase. We make no representation as to the amount of dividends, if any, that the Fund will pay in the future. In any event, as an investor in the Securities, you will not be entitled to receive dividends, if any, that may be payable on the Fund.

The graph below illustrates the daily performance of the Fund from January 2, 2002 through December 27, 2012, based on information from Bloomberg, without independent verification.

Past performance of the Fund is not indicative of the future performance of the Fund.

Supplemental Plan of Distribution

We have agreed to indemnify UBS and JPMS against liabilities under the Securities Act of 1933, as amended, or to contribute to payments that UBS may be required to make relating to these liabilities as described in the prospectus supplement and the prospectus. We have agreed that UBS may sell all or a part of the Securities that it purchases from us to its affiliates at the price indicated on the cover of this amended and restated pricing supplement.

Subject to regulatory constraints, JPMS intends to offer to purchase the Securities in the secondary market, but it is not required to do so.

We or our affiliates may enter into swap agreements or related hedge transactions with one of our other affiliates or unaffiliated counterparties in connection with the sale of the Securities, and JPMS and/or an affiliate may earn additional income as a result of payments pursuant to the swap or related hedge transactions. See "Use of Proceeds and Hedging" beginning on page PS-25 of the accompanying product supplement no. UBS-7-II.

Validity of the Securities

Restated below is the opinion of Davis Polk & Wardwell LLP, as our special products counsel, delivered on December 27, 2012 relating to the Securities:

"In the opinion of Davis Polk & Wardwell LLP, as our special products counsel, when the Securities offered by this [amended and restated] pricing supplement have been executed and issued by us and authenticated by the trustee pursuant to the indenture, and delivered against payment as contemplated herein, such Securities will be our valid and binding obligations, enforceable in accordance with their terms, subject to applicable bankruptcy, insolvency and similar laws affecting creditors' rights generally, concepts of reasonableness and equitable principles of general applicability (including, without limitation, concepts of good faith, fair dealing and the lack of bad faith), provided that such counsel expresses no opinion as to the effect of fraudulent conveyance, fraudulent transfer or similar provision of applicable law on the conclusions expressed above. This opinion is given as of [December 27, 2012] and is limited to the federal laws of the United States of America, the laws of the State of New York and the General Corporation Law of the State of Delaware. In addition, this opinion is subject to customary assumptions about the trustee's authorization, execution and delivery of the indenture and its authentication of the Securities and the validity, binding nature and enforceability of the indenture with respect to the trustee, all as stated in the letter of such counsel dated March 29, 2012, which was filed as an exhibit to a Current Report on Form 8-K by us on March 29, 2012."