MAN AHL DIVERSIFIED I LP - Annual Report: 2013 (Form 10-K)

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

For the Fiscal Year Ended: December 31, 2013

or

Commission File Number: 000-53043

Man-AHL Diversified I L.P.

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (212) 649-6600

Securities registered pursuant to Section 12(b) of the Act: None

Securities registered pursuant to Section 12(g) of the Act: Units of Limited Partnership Interest

(Title of Class)

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes  ¨    No  x

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    Yes  ¨    No  x

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  x    No  ¨

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§229.405 of this chapter) is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.    x

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).    Yes  ¨    No  x

State the aggregate market value of the voting and non-voting common equity held by non-affiliates computed by reference to the price at which the common equity was last sold, or the average bid and asked price of such common equity, as of the last business day of the registrant’s most recently completed second fiscal quarter.

Not applicable.

Documents Incorporated by Reference

The report of the independent registered public accounting firm and the financial statements of the Registrant for the year ended December 31, 2013 are included herewith as exhibit 13.1 and are incorporated by reference into Item 8 of this Annual Report on Form 10-K.

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PART I

Item 1. Business

(a) General development of business

Man-AHL Diversified I L.P., a Delaware limited partnership (the “Partnership”), was organized in September 1997 under the Delaware Revised Uniform Limited Partnership Act and commenced trading operations on April 3, 1998, for the purpose of engaging in the speculative trading of physical commodities, futures and forward contracts and related instruments. The Partnership was formerly named AHL Diversified (USA) L.P., but was renamed in February 2002. The Partnership is a “feeder” fund in a “master-feeder” structure, whereby the Partnership invests substantially all of its assets in Man AHL Diversified Trading Company L.P. (the “Trading Company”). Man-AHL (USA) Limited (the “Trading Advisor”), a United Kingdom company, is the Partnership’s and the Trading Company’s trading advisor. Man Investments (USA) Corp. (the “General Partner”), a Delaware corporation and a registered commodity pool operator under the Commodity Exchange Act, as amended, is the Partnership’s general partner and commodity pool operator. The Trading Advisor is an affiliate of the General Partner. Man Investments Holdings Limited, a United Kingdom holding company that is part of Man Group plc, a United Kingdom public limited company, is the sole shareholder of the Trading Advisor, and Man Investments Holdings Inc., a Delaware corporation that is part of Man Group plc, is the sole shareholder of the General Partner.

On January 28, 2008, the Partnership filed a registration statement under the Securities Exchange Act of 1934, which registration statement was subsequently amended. The registration statement became effective on or about March 28, 2008. The Partnership offers two classes of units of limited partnership interest in the Partnership (“Units”): Class A Units are generally offered; Class B Units are offered to employee benefit plans, IRAs and other retirement plans and accounts. The two Classes of Units are identical to each other except that Class B Units may be purchased, transferred, held and redeemed in a minimum amount of $10,000. On April 1, 2009, the Partnership added two new series of Units: Class A Series 2 Units (“Class A-2”) and Class B Series 2 Units (“Class B-2”). Except as described in section (c) below, Class A-2 and Class B-2 units are identical to Class A and B units, respectfully.

Although the Partnership uses the term “class” to distinguish between certain interests in the Partnership, the Partnership does not believe that the differences between such interests are sufficient to make them separate “classes” under Section 12(g) of the Securities Exchange Act of 1934, as all the interests in the Partnership, regardless of “class,” are of substantially similar character and the holders of which enjoy substantially similar rights and privileges. The holders of interests in the Partnership (regardless of “class”) share pro rata in the Partnership’s profits and losses, enjoying no preferences over one another during the life of the Partnership or upon dissolution and otherwise have identical rights under the Limited Partnership Agreement, the only differences among the “classes” relating to fees and minimum investment.

The General Partner became the general partner of the Partnership as of April 1, 2005 when Man-AHL (USA) Corp., the Partnership’s original general partner and trading advisor (“Man-AHL”), appointed it as such. In addition to the appointment of the General Partner, Man-AHL appointed the Trading Advisor to serve as the trading advisor to the Partnership commencing as of April 1, 2005. Following the appointments of the General Partner as a general partner and the Trading Advisor as the trading advisor, Man-AHL resigned as a general partner and trading advisor of the Partnership. The General Partner agreed to continue the Partnership without interruption or change. The General Partner controls and manages the business of the Partnership. Purchasers of Units, as the Partnership’s “Limited Partners,” have no right to participate in management or control of the Partnership. The offices of the Partnership, where its books and records are kept, are located at the office of the General Partner: HSBC Tower, 452 5^th Ave., 25^th Floor, New York, NY; telephone (212) 649-6600.

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(b) Financial information about segments

The Partnership’s business constitutes only one segment, i.e., a speculative commodity pool. The Partnership does not engage in sales of goods and services. Financial information regarding the Partnership’s business is set forth in the Partnership’s Financial Statements incorporated into Item 8 hereof and attached as Exhibit 13.1 hereto.

(c) Narrative description of business

The Partnership engages in speculative trading of physical commodities, futures contracts, spot and forward contracts, swaps and options and other related instruments, directly and indirectly through an investment in the Trading Company, pursuant to the trading strategies employed by the Trading Advisor. The Partnership invests substantially all of its assets in the Trading Company.

The investment objective of the Trading Advisor’s futures trading program (referred to herein as the “AHL Diversified Program”) is to deliver substantial capital growth over time, independent of the movement of the stock and bond markets, through the speculative trading, directly and indirectly, of physical commodities, futures contracts, spot and forward contracts, swaps and options on the foregoing, exchanges of futures for physical transactions and other investments (sometimes hereinafter referred to as ‘futures’) on domestic and international exchanges and markets (including the interbank and over-the-counter markets).

The AHL Diversified Program employs a systematic, statistically based investment strategy that is designed to identify and capitalize on inefficiencies in markets around the world. A stable and robust trading and implementation infrastructure is then employed to capitalize on these trading opportunities. The trading systems are quantitative and primarily directional in nature, meaning that investment decisions are entirely driven by mathematical models based on market trends and other historic relationships. Trading signals are always generated systematically; thus the Trading Advisor does not engage in discretionary trading during drawdowns or at other times. Trading takes place around-the-clock and real-time price information is used to respond to price moves across a diverse range of global markets. The trade execution team operates alongside the investment management team in London. It operates 24 hours a day on a rotational eight-hour shift structure.

The trading process is the product of continuing research and development performed by the Trading Advisor (inclusive of its affiliates) since 1987. Although the underlying investment methodology is proprietary and the precise details confidential, the guiding principles have remained unchanged through the years: diversification, discipline, efficiency, rigorous risk management and ongoing research.

The AHL Diversified Program invests in a diversified portfolio of instruments which may include futures, options and forward contracts, swaps and other financial derivative instruments both on and off exchange. The AHL Diversified Program trades globally in several market sectors, including, without limitation, currencies, bonds, energies, stock indices, interest rates, metals and agriculture.

In addition to sector and market diversification, the AHL Diversified Program seeks to achieve diversification by combining various systems driven by computerized processes or trading algorithms, which sample prices in real time and measure price momentum and breakouts. In aggregate, the systems run more than 2,000 price samples each day spread across the 200 or so markets traded. The trading algorithms aim mainly to capture price trends and close out positions when there is a high probability of a different trend developing, although the AHL Diversified Program may also include algorithmic systems based on quantitative fundamental data that can be captured efficiently, such as interest rate data. Another aspect of diversification is the fact that the various systems generate signals across different time frames, ranging from two to three days to several months, which helps to reduce the risk of the AHL Diversified Program.

In line with the principle of diversification, the approach to portfolio construction and asset allocation is premised on the importance of deploying investment capital across the full range of sectors and markets.

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Particular attention is paid to correlation of markets and sectors, expected returns, trading costs and market liquidity. Portfolios are regularly reviewed and, when necessary, adjusted to reflect changes in these factors. The Trading Advisor also has a process for adjusting market risk exposure in real time to reflect changes in the volatility of individual markets.

The integrity of the AHL Diversified Program’s defined investment style is ensured by adherence to a rigorous control process. All the strategies and systems applied by the Trading Advisor are designed to target defined volatility levels rather than returns, and the investment process is underpinned by computer-supported analytical instruments, disciplined real-time risk control and management information systems. As risk control is integral to each part of the investment process, risk management consists primarily of monitoring risk measures and ensuring the systems remain within prescribed limits. A proprietary risk measurement method similar to the industry standard “value-at-risk” helps ensure that the rule-based decisions that drive the investment process remain within predefined risk parameters. Margin-to-equity ratios are monitored daily, and the level of exposure in each market is quantifiable at any time and is adjusted in accordance with market volatility. Market correlation is closely monitored to prevent over-concentration of risk and ensure optimal portfolio weightings. Market liquidity is examined with the objective of ensuring that the Trading Company will be able to initiate and close out trades as indicated by AHL Diversified Program’s systems at market prices, while brokerage selection and trade execution are continually monitored with the objective of ensuring quality market access.

As the success of the AHL Diversified Program is largely dependent on its systems, the Trading Advisor is committed to investing in leading computer technology. The Trading Advisor (inclusive of affiliates) also maintains a disaster recovery site where a back-up trading system runs permanently and in parallel with the main system.

The AHL Diversified Program uses margin and considerable leverage to reach model allocations.

The AHL Diversified Program is supported by a dedicated team of investment specialists that continually seek to extend the range and versatility of the original investment techniques. As such, The Trading Advisor may increase the number and diversity of markets, strategies and instruments traded directly or indirectly by the AHL Diversified Program.

The Trading Advisor is paid a monthly management fee, payable in arrears, in an amount equal to 0.1667% of the month-end Net Asset Value of the Partnership (as defined in the Partnership’s Sixth Amended and Restated Limited Partnership Agreement, as the same may be amended or supplemented from time to time (the “Agreement”)) whether or not the Partnership is profitable (approximately 2% annually). The General Partner is paid a monthly general partner administrative fee in an amount equal to 0.0833% of the month-end Net Asset Value of the Partnership whether or not the Partnership is profitable (approximately 1% annually). The Trading Advisor may pay a portion of its management fee to the General Partner, and the General Partner may share a portion of its administrative fee with the Placement Agent (as defined below).

The Partnership will pay the Trading Advisor an incentive fee equal to 20% of the Net New Appreciation (as defined in the Agreement), if any, achieved by the Partnership as of the end of such calendar month. Net New Appreciation achieved during a calendar month means the excess, if any, of (a) the Net Asset Value of the Partnership as of the end of a calendar month (without reduction for any incentive fees accrued or paid to the Trading Advisor for the calendar month or for any redemptions or distributions effected during or as of the end of such calendar month and without increase for any additional capital contributions effected during or as of the end of such calendar month) over (b) the Net Asset Value of the Partnership as of the end of the most recent prior calendar month for which an incentive fee was accrued or paid to the Trading Advisor, with clause (b) reduced by the amount of the incentive fee accrued or paid for such prior calendar month and also reduced by any redemptions or distributions, and increased by any contributions, effected as of or subsequent to the end of such prior calendar month through the first day of the calendar month referred to in clause (a), above.

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Man Investments Inc., an affiliate of the General Partner and Trading Advisor, is the lead placement agent for the Partnership (the “Placement Agent”). In connection with various services provided by the Placement Agent to the Partnership related to the offer and sale of interests in the Partnership and the ongoing servicing of its investors, the Partnership will pay the Placement Agent a servicing fee equal to, in respect to Class A Units and Class B Units, 0.0833% of the month-end Net Asset Value of such Units (approximately 1% annually), and in respect of Class A-2 Units and Class B-2 Units, 0.0625% of the month-end Net Asset Value of such Units (approximately 0.75% annually), whether or not the Partnership is profitable as of the end of each month. The Placement Agent may pass all or a portion of the servicing fee on to certain other selling and services agents. In addition, Units purchased through such selling and services agents may be subject to the payment of an additional upfront selling commission of up to 3% of the purchase price of the Units.

The Partnership’s organizational and initial offering fees and expenses were approximately $50,000 (including its pro-rata share of the Trading Company’s organizational fees and expenses) and have been paid by the Partnership. Such organizational fees and expenses (excluding promotional and offering fees and expenses) have been completely amortized. The Partnership pays all of its expenses incurred in the ordinary course of its business. The Partnership also pays its extraordinary expenses, if any.

The Trading Company utilizes a number of brokers in the performance of its trading activities. Credit Suisse, Sydney Branch, Credit Suisse Securities (USA), J.P. Morgan Securities LLC and Merrill Lynch, Pierce, Fenner & Smith Incorporated serve as the Trading Company’s futures brokers; the Royal Bank of Scotland, JPMorgan Chase Bank, N.A. and Deutsche Bank AG, London Branch serve as the Trading Company’s foreign exchange prime brokers; J.P. Morgan Chase Bank, N.A. acts as the clearing broker for over-the-counter credit default swap index transactions engaged in by the Trading Company; and the Royal Bank of Scotland acts as the clearing broker for certain interest rate swap transactions (collectively, the “Brokers”). The Partnership is charged brokerage commissions at institutional rates, inclusive of all applicable National Futures Association (the “NFA”), exchange, clearing and other transaction fees. In connection with trading spot and forward contracts in the interbank foreign currency markets, the Partnership pays clearing fees of between $3.25 and $4.00 per transaction as well as dealer profits, which cannot be quantified, embedded in dealer quotes.

The Partnership invests substantially all of its assets in the Trading Company. Most of the Trading Company’s assets will be held in cash or United States government securities in accounts in the name of the Trading Company at the brokers or a bank, which currently is JP Morgan Chase Bank, N.A. (Chicago, Illinois), and in order to conduct futures trading activities, will be transferred, as necessary, into segregated accounts at the brokers. Approximately 20% to 40% of the Trading Company’s assets will be committed as margin for futures positions. The brokers may receive compensating balance treatment and excess interest income on the Partnership’s assets, through the Trading Company, held at the brokers in the form of cash.

The Trading Company engages in trading on non-U.S. exchanges and markets. In connection with trading on non-U.S. exchanges and markets, the brokers may either maintain Trading Company assets in accordance with the requirements of the Commodity Futures Trading Commission (“CFTC”) Rule 30.7 or may redeposit Trading Company assets with non-U.S. banks and brokers which may not be subject to regulatory schemes comparable to those applicable to the Brokers.

Regulation

Under the Commodity Exchange Act, as amended (the “CEA”), commodity exchanges and futures trading are subject to regulation by the CFTC. The NFA, a “registered futures association” under the CEA, is the only non-exchange self-regulatory organization for futures industry professionals. The CFTC has delegated to NFA responsibility for the registration of “commodity trading advisors,” “commodity pool operators,” “futures commission merchants,” “introducing brokers” and their respective associated persons and “floor brokers” and “floor traders.” The CEA requires commodity pool operators and commodity trading advisors, such as the General Partner and Trading Advisor, respectively, and commodity brokers or futures commission merchants to

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be registered and to comply with various reporting and record keeping requirements. The CFTC may suspend a commodity pool operator’s or trading advisor’s registration if it finds that its trading practices tend to disrupt orderly market conditions or in certain other situations. In the event that the registration of the General Partner as a commodity pool operator or the Trading Advisor as a commodity trading advisor were terminated or suspended, the General Partner would be unable to continue to manage the business of the Partnership or Trading Advisor would be unable to implement the AHL Diversified Program on behalf of the Partnership. Should the General Partner’s or Trading Advisor’s registration be suspended, termination of the Partnership might result.

In addition to such registration requirements, the CFTC and certain commodity exchanges have established limits on the maximum net long or net short position which any person may hold or control in particular commodities. Most exchanges also limit the changes in futures contract prices that may occur during a single trading day.

The CFTC adopted a separate position limits rule for 28 so-called “exempt” (i.e. metals and energy) and agricultural futures and options contracts and their economically equivalent swap contracts. Limits in spot months were generally to be set at 25% of the official estimated deliverable supply of the underlying commodity and, in a non-spot month, a percentage of the average aggregate 12-month rolling open interest in all months (swaps and futures) for each contract. Although substantial portions of this rule were vacated by court action, the CFTC, in November 2013, proposed substantially similar rules to its prior position limits regime. It is as yet unclear whether the Trading Advisor will be required to modify its trading on behalf of its clients, including the Trading Company, with respect to certain futures contracts which may have an adverse affect the Partnership.

Currency forward contracts traded by the Trading Company are not currently subject to regulation by any United States (“U.S.”) Government agency.

Item 1A. Risk Factors.

Risk of Loss. Investing in the Partnership is speculative and involves substantial risks. You should not invest unless you can afford to lose your entire investment.

General. The transactions in which the Advisor generally will engage in on behalf of the Partnership involve significant risks. Growing competition may limit the Advisor’s ability to take advantage of trading opportunities in rapidly changing markets. No assurance can be given that investors will realize a profit on their investment. Moreover, investors may lose all or some of their investment. Because of the nature of the trading activities, the results of the Partnership’s operations may fluctuate from month to month and from period to period. Accordingly, investors should understand that the results of a particular period will not necessarily be indicative of results in future periods.

Markets Are Volatile and Difficult to Predict. Trading in futures is a speculative activity. Futures prices may be highly volatile. Market prices are difficult to predict and are influenced by many factors, including: changes in interest rates; governmental, agricultural, trade, fiscal, monetary and exchange control programs and policies; weather and climate conditions; changing supply and demand relationships; national and international political and economic events; and the changing philosophies and emotions of market participants. In addition, governments intervene in particular markets from time to time, both directly and by regulation, often with the intent to influence prices. The effects of government intervention may be particularly significant in the financial instrument and currency markets, and may cause such markets to move rapidly.

Trading Is Highly Leveraged. The low margin deposits normally required in futures trading permit an extremely high degree of leverage. A relatively small movement in the price of a futures contract may result in immediate and substantial loss or gain to a trader holding a position in such contract. For example, if at the time of purchase 10% of the price of a futures contract is deposited as margin, a 10% decrease in the price of the futures contract would, if the contract were then closed out, result in a total loss of the margin deposit before any

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deduction for brokerage commissions. Consequently, like other leveraged investments, a futures trade may result in losses in excess of the amount invested. Forward contracts involve similar leverage and also may require deposits of margin as collateral. Swaps and OTC derivative instruments are also highly leveraged transactions.

Markets May Be Illiquid. At times, it may not be possible for the Advisor to obtain execution of a buy or sell order at the desired price or to liquidate an open position, either due to market conditions on exchanges or due to the operation of “daily price fluctuation limits” or “circuit breakers.” For example, most U.S. commodity exchanges limit fluctuations in most futures contract prices during a single day by regulations referred to as “daily price fluctuation limits” or “daily limits.” During a single trading day, no trades may be executed at prices beyond the daily limit. Futures contract prices occasionally have moved to the daily limit for several consecutive days with little or no trading.

Even when futures prices have not moved to the daily limit, the Advisor might not be able to obtain execution of trades at favorable prices if little trading in the contracts which the Advisor wishes to trade is taking place. Also, an exchange or governmental authority may suspend or restrict trading on an exchange (or in particular futures traded on an exchange) or order the immediate settlement of a particular instrument.

Options trading may be restricted in the event that trading in the underlying instrument becomes restricted. Options trading also may be illiquid at times regardless of the condition of the market in the underlying instrument. In either event, it will be difficult for the Advisor to realize gain or limit losses on option positions by offsetting them or to change positions in the market.

Trading in OTC derivative instruments is conducted with individual counterparties rather than on organized exchanges. There have been periods during which forward contract dealers have refused to quote prices for forward contracts or have quoted prices with an unusually wide spread between the bid and asked price.

Speculative Position Limits May Restrict Futures Trading. Speculative position limits prescribe the maximum net long or short futures contract and options positions which any person or group may hold or control in particular futures contracts. All futures contracts and options on futures contracts traded on commodity exchanges located in the United States, with the exception of contracts on certain major non-U.S. currencies, are subject to speculative position limits established either by the CFTC or the relevant exchange.

All trading accounts owned or managed by the Advisor and its principals will be combined for the purposes of speculative position limits. Such limits could adversely affect the profitability of the Trading Company and, consequently, of the Partnership. For example, the Advisor could be required to liquidate futures positions at an unfavorable time in order to comply with such limits. However, the Advisor does not believe that existing speculative position limits will materially adversely affect its ability to manage the Trading Company’s account.

Cash Flow. Futures contract gains and losses are marked-to-market daily for purposes of determining margin requirements. Option positions generally are not, although short option positions will require additional margin if the market moves against the position. Due to these differences in margin treatment between futures and options, there may be periods in which positions on both sides must be closed down prematurely due to short term cash flow needs. If this were to occur during an adverse move in a spread or straddle relationship, a substantial loss could occur.

Decisions Based on Trends and Technical Analysis. The trading decisions of the Advisor will be based in part on trading strategies which utilize mathematical analyses of technical factors relating to past market performance. The buy and sell signals generated by a technical, trend-following trading strategy are based upon a study of actual daily, weekly and monthly price fluctuations, volume variations and changes in open interest in the markets. The profitability of any technical, trend-following trading strategy depends upon the occurrence in the future of significant, sustained price moves in some of the markets traded. The Trading Company and, consequently, the Partnership may incur substantial trading losses:

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In the past there have been prolonged periods without sustained price moves in various markets. Presumably, such periods will recur. A series of volatile reverses in price trends may generate repeated entry and exit signals in trend-following systems, resulting in unprofitable transactions and increased brokerage commission expenses. Technical, trend-following trading systems are used by many other traders. At times, the use of such systems may:

Trading in OTC Markets Will Expose the Partnership to Risks Not Applicable to Trading on Organized Exchanges. The Partnership, through the Trading Company, may engage in OTC derivative transactions, such as: currency forward contracts traded in the interbank market; options on currency forward contracts; and swap transactions.

In general, there is much less governmental regulation and supervision of transactions in the OTC markets than of transactions entered into on organized exchanges. Most of the protections afforded to participants on U.S. and certain non-U.S. exchanges, such as daily price fluctuation limits and the performance guarantee of an exchange clearinghouse, will not be available in connection with OTC transactions. Consequently, the Partnership will be exposed to greater risk of loss through default than if it confined its trading to organized exchanges.

A portion of the Partnership’s assets may be traded in forward contracts. Such forward contracts are not traded on exchanges and are executed directly through forward contract dealers. There is no limitation on the daily price moves of forward contracts, and a dealer is not required to continue to make markets in such contracts. There have been periods during which forward contract dealers have refused to quote prices for forward contracts or have quoted prices with an unusually wide spread between the bid and asked price. Arrangements to trade forward contracts may therefore experience liquidity problems. The Partnership therefore will be subject to the risk of credit failure or the inability of or refusal of a forward contract dealer to perform with respect to its forward contracts. When trading currency forward contracts, the Trading Company may hedge the foreign currencies in order to limit the Trading Company’s exposure to fluctuations in exchange rates. However, there is no guarantee that such hedging will be successful.

Exchanges for Physicals/Swaps/Risk. While not a regular practice for the Trading Company, it may in rare instances engage in transactions known as exchanges for physicals (“EFP”), exchanges for swaps (“EFS”), or exchanges for risk/over-the-counter derivatives (“EFR”). An EFP/EFS/EFR is a purchase or sale of a spot commodity/swap/derivative, as applicable, in conjunction with an offsetting sale or purchase of a corresponding futures contract involving the same or equivalent underlying commodity or instrument, without making an open and competitive trade for the futures contract on the exchange. EFPs, EFSs and EFRs are a permitted exception to the general requirement of the CEA that all futures contracts must be competitively executed on an exchange. They are permitted pursuant to the rules of the relevant exchanges, which vary from exchange to exchange. If the EFP, EFS or EFR does not comply with specific exchange requirements, particularly regarding possessing documentation evidencing possession of the underlying commodity or instrument, then the CFTC or the exchange may deem the transaction to be an illegal off-exchange futures contract. In addition, every EFP, EFS or EFR involves the transfer of an underlying commodity or entry into a swap or derivative on a bilateral basis, as applicable, with a counterparty in exchange for a related cleared futures contract. There is, therefore, counterparty credit risk if the counterparty or its clearing member on the futures leg fails to perform. Unlike other

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futures contracts that are deemed cleared by the clearinghouse upon trade matching or at the end of the business day, futures contracts arising out of EFPs, EFSs or EFRs may, under various clearinghouse rules, not be deemed accepted by the clearinghouse until the next business day.

Options on Futures Contracts Are More Volatile Than Futures Contracts. The Advisor may trade options on futures contracts. Options are speculative in nature and are highly leveraged. The purchaser of an option risks losing the entire purchase price of the option. The seller (writer) of an option risks losing the difference between the premium received for the option and the price of the underlying futures contract that the writer must purchase upon exercise of the option. Additionally, the seller and writer of the options lose any commissions and fees associated with such transactions. This could subject the writer to unlimited risk in the event of an increase in the price of the contract to be purchased or delivered. Successful trading of options on futures contracts requires a trader to accurately determine near-term market volatility because it often has an immediate impact on the price of outstanding options. Accurate determination of near-term volatility is more important to successful options trading than it is to long-term futures contract trading strategies because such volatility generally does not have as significant an effect on the prices of futures contracts.

Trading on Non-U.S. Exchanges and Markets Will Expose the Partnership to Risks Not Applicable to Trading on U.S. Exchanges and Markets. The Partnership, through the Trading Company, may engage in trading on non-U.S. exchanges and markets. The Partnership will be subject to the risk of fluctuations in the currency exchange rate between the local currency and the U.S. dollar and to the possibility of exchange controls. Trading on such exchanges and markets generally involves other risks not applicable to trading on U.S. exchanges and markets.

For example, such exchanges and markets:

Institutional Risks. Institutions, such as the brokers, will have custody of the assets of the Partnership. These firms may encounter financial difficulties that impair the operating capabilities or the capital position of the Partnership, the Trading Company or the General Partner. The General Partner and Advisor will attempt to limit its transactions to well-capitalized and established brokers in an effort to mitigate such risks.

Counterparty Risk. The Partnership will be subject to the risk of the inability of counterparties to perform with respect to transactions, particularly uncleared swap and currency forward transactions, whether due to insolvency, bankruptcy or other causes, which could subject the Partnership to substantial losses. In an effort to mitigate such risks, the General Partner and Advisor will attempt to limit transactions to counterparties, which are established, well-capitalized and creditworthy.

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Item 1B. Unresolved Staff Comments.

Not applicable.

Item 2. Properties.

The Partnership does not own or use any physical properties in the conduct of its business. The General Partner and various service providers perform services for the Partnership from their offices.

Item 3. Legal Proceedings.

The General Partner is not aware of any pending legal proceedings to which either the Partnership is a party or to which any of its assets are subject. In addition there are no pending material legal proceedings involving either the General Partner or Trading Advisor.

Item 4. Mine Safety Disclosures.

Not applicable.

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PART II

Item 5. Market for the Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities.

(a) Market Information.

There is no trading market for the Units, and none is likely to develop. Units may be redeemed upon 10 days’ written notice to the General Partner at their Net Asset Value as of the last business day of each calendar month; provided, however, that each Limited Partner must maintain a minimum investment of $25,000 and $10,000, respectively of Class A Units (or Class A-2 Units) and Class B Units (or Class B-2 Units), in the Partnership following any redemption initiated by such Limited Partner in order to remain invested in the Partnership.

(b) Holders.

As of December 31, 2013, there were 1,052 holders of Class A Units, 82 holders of Class A-2 Units, 938 holders of Class B Units and 6 holders of Class B-2 Units.

(c) Dividends.

No distributions or dividends have been made on the Units, and the General Partner has no present intention to make any.

(d) Securities Authorized for Issuance Under Equity Compensation Plans.

None.

(e) Recent Sales of Unregistered Securities; Use of Proceeds from Registered Securities.

Pursuant to the Partnership’s Limited Partnership Agreement, the Partnership may admit additional Limited Partners to the Partnership and permit additional capital contributions to be made to the Partnership as of the last business day of any calendar month or at such other times as the General Partner may determine. On October 31, 2013, November 30, 2013 and December 31, 2013, the Partnership sold Class A Units to existing and new Limited Partners in the amount of $526,450, $0 and $425,000, respectively; Class A-2 Units to existing and new Limited Partners in the amount of $0, $0 and $0, respectively; Class B Units to existing and new Limited Partners in the amount of $112,000, $65,000 and $229,363, respectively; and Class B-2 Units to existing and new Limited Partners in the amount of $0, $0 and $0, respectively. There were no underwriting discounts or commissions in connection with the sales of the Units described above.

(f) Issuer Purchases of Equity Securities.

Pursuant to the Partnership’s Limited Partnership Agreement, a Limited Partner may redeem some or all of its Units as of the last business day of each calendar month at the then current month-end Net Asset Value. The redemption of Units has no impact on the value of Units that remain outstanding, and Units are not reissued once redeemed. The following table summarizes the amount of Units redeemed during the three months ended December 31, 2013:

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Item 6. Selected Financial Data

The following is a summary of operations for the fiscal years 2013, 2012, 2011, 2010 and 2009 and total assets of the Partnership at December 31, 2013, 2012, 2011, 2010 and 2009.

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Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations

Reference is made to “Item 8. Financial Statements and Supplementary Data.” The information contained therein is essential to, and should be read in conjunction with, the following analysis.

Capital Resources and Liquidity

Units may be offered for sale as of the first business day, and may be redeemed as of the last business day, of each month.

The Partnership raises additional capital only through the sale of Units and capital is increased through trading profits (if any) and interest income. The Partnership does not engage in borrowing. The Partnership, not being an operating company, does not incur capital expenditures. It functions solely as a passive trading vehicle, investing the substantial majority of its assets in the Trading Company. Its remaining capital resources are used only as assets available to make further investments in the Trading Company and to pay Partnership expenses. Accordingly, the amount of capital raised for the Partnership should not have a significant impact on its operations.

Partnership assets not invested in the Trading Company are maintained in cash and cash equivalents in bank accounts or accounts with the JPMorgan Chase Bank, N.A. and are readily available to the Partnership. The Partnership may redeem any part or all of its limited partnership interest in the Trading Company at any month-end at the net asset value per unit of the Trading Company. The Trading Company’s assets are generally held as cash or cash equivalents which are used to margin futures and provide collateral for forward contracts and other over-the-counter contract positions and are withdrawn, as necessary, to pay redemptions (to the Partnership and other investors in the Trading Company). Other than potential market-imposed limitations on liquidity, due, for example, to limited open interest in certain futures markets or to daily price fluctuation limits, which are inherent in the Trading Company’s futures trading, the Trading Company’s assets are highly liquid and are expected to remain so.

During its operations through December 31, 2013, the Partnership experienced no meaningful periods of illiquidity in any of the numerous markets in which it trades.

Critical Accounting Principles

The Partnership records its transactions in futures and forward contracts, including related income and expenses, on a trade-date basis. Open futures contracts traded on an exchange are valued at fair value, which is based on the closing settlement price on the exchange where the futures contract is traded by the Partnership on the day with respect to which the Partnership’s Net Asset Value is being determined. Open forward contracts and other derivatives traded on the interbank market are valued at fair value at their settlement price on the day with respect to which the Partnership’s Net Asset Value is being determined. If the General Partner determines the fair value of an investment cannot be accurately determined pursuant to the foregoing methods, such investment shall be assigned such fair value as the General Partner may determine in its sole discretion.

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions, such as accrual of expenses, that affect the amounts and disclosures reported in the financial statements. Based on the nature of the business and operations engaged in by the Partnership, the General Partner believes that the estimates utilized in preparing the Partnership’s financial statements are appropriate and reasonable; however, actual results could differ from the estimates. The estimates do not provide a range of possible results that would require the exercise of subjective judgment. The General Partner further believes that, based on the nature of the business and operations of the Partnership, no other reasonable assumptions relating to the application of the Partnership’s critical accounting estimates other than those to be used would likely result in materially different amounts from those reported. The Partnership’s significant accounting policies are described in detail in Note 2 to the Financial Statements.

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Off-Balance Sheet Arrangements

Neither the Partnership nor the Trading Company engages in off-balance sheet arrangements with other entities.

Contractual Obligations

The Partnership does not enter into contractual obligations or commercial commitments to make future payments of a type that would be typical for an operating company or that would affect its liquidity or capital resources. The Partnership’s sole business is trading futures contracts, forward currency and other OTC contracts, both long (contracts to buy) and short (contracts to sell), and investing in cash and cash equivalents. All of the Partnership’s futures, forward and OTC contracts, other than certain currency forward contracts, are settled by offset, not delivery. The substantial majority of such contracts are for settlement within four to six months of the trade date and the substantial majority of such contracts are held by the Partnership for less than four to six months before being offset or rolled over into new contracts with similar maturities. The Partnership’s annual audited financial statements with the attached Trading Company’s annual audited financial statements, included as Exhibit 13.1 of this report, present a Condensed Schedule of Investments setting forth net unrealized appreciation (depreciation) of the Partnership’s open positions, both long and short, at the December 31, 2013 fiscal year-end.

Results of Operations

Due to the nature of the Partnership’s trading, the Partnership’s income or loss from operations may vary widely from period to period. Management cannot predict whether the Partnership’s future Net Asset Value per Unit will increase or experience a decline. The Partnership was organized in September 1997 under the Delaware Revised Uniform Limited Partnership Act and commenced operations on April 3, 1998.

Performance Summary

The Partnership is a speculative managed futures fund which trades pursuant to the AHL Diversified Program, indirectly through its investment in the Trading Company. The AHL Diversified Program is a futures and forward price trend-following, trading system. The AHL Diversified Program is entirely quantitative in nature and implements trading positions on the basis of statistical analyses of past price histories. The AHL Diversified Program, like most trend-following systems, is designed in the anticipation that most of its trades will be unprofitable; the objective of overall profitability depends on the system identifying certain major trends which occur and recognizing significant profits from participating in such trends.

The past performance of the AHL Diversified Program is not necessarily indicative of its future results. This is the case with all speculative trading strategies. Moreover, the markets in which the AHL Diversified Program is active have seen major changes in recent years, including the influx of entirely different classes of market participants. These changed circumstances may mean that the markets in which the Trading Advisor has previously traded on behalf of the Trading Company are not necessarily representative of those in which it trades on behalf of the Trading Company currently.

As a speculative futures fund, the Partnership (through the Trading Company) effectively maintains all of its capital in reserve. The Trading Company does not “buy” or “sell” futures or forward contracts in the traditional sense; rather, through taking positions in these markets, the Trading Company, and thus the Partnership indirectly, acquires loss/profit exposure and uses its capital to cover losses and provide margin (which constitutes a good faith deposit towards the Trading Company’s (but not the Partnership’s) obligation to pay such losses) to support its open positions. Each of the Partnership and the Trading Company maintains most of its capital in cash and cash equivalents.

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Futures trading programs are proprietary and confidential. As is the case with any speculative futures fund, it is impossible to predict how the Partnership will perform. It is not possible, as it is in the case of an operating business, to predict performance trends, analyze future market conditions or evaluate the likely success or failure of the Partnership.

There are certain general market conditions in which the Partnership is more likely to be profitable than in others. For example, in trendless or stagnant markets, the AHL Diversified Program is unlikely to be profitable. On the other hand, trending markets with substantial price change momentum can be favorable to the AHL Diversified Trading Program. However, because of the continually changing population of market participants as well as supply and demand characteristics, it cannot be predicted how the AHL Diversified Program, and thus the Partnership, will perform in any given market conditions.

Net assets decreased $176,469,369 for the year ended December 31, 2013. This decrease was attributable to subscriptions in the amount of $13,658,527, redemptions in the amount of $172,227,858 and net loss from operations of $17,900,038.

For the year ended December 31, 2013, the Partnership accrued or paid total expenses of $14,202,849, including $4,507,344 in servicing fees, $9,312,545 in General Partner administrative fees and Trading Advisor management fees, and $382,960 in other expenses. Interest of $302,588 was earned or accrued on the Partnership’s cash and cash equivalent investments.

The Net Asset Value of a Class A Unit decreased by $176.65 to $2,707.82. The Net Asset Value of a Class B Unit decreased by $176.65 to $2,707.83. The Net Asset Value of a Class A-2 Unit decreased by $149.34 to $2,874.06. The Net Asset Value of a Class B-2 Unit decreased by $149.33 to $2,874.09.

Trading in bonds and short term interest rates started off with losses in January 2013, the main detractors being long positions in US Treasuries, French bonds, Short Sterling and Eurodollar. However, bond trading returned to profitability in February as markets returned to a more cautious state following January’s bullish nature. Safe haven bonds, such as US Treasuries, returned some of the larger gains with returns also coming from emerging market bonds. Long interest rate positions, such as in Eurodollar, Euribor and Short Sterling, further provided positive results because of the relaxed monetary policies of major central banks. In March, bond trading largely continued this positive run due to the portfolio’s long bond holdings. A small portion of the gain, however, was lost via Italian long dated bonds and positions in US Treasuries. In April, a long exposure to fixed income assets including European bonds, US Treasuries and Eurodollar contracts again delivered profits despite a loss on long exposures to Japanese bonds. The Partnership subsequently sustained a loss in May primarily because of its long exposure to US Treasuries, UK gilts and bonds from commodity focused economies. Long exposure to interest rate holdings also incurred a loss following a cut in Eurozone rates. Indeed, Eurodollar, Euribor and Short Sterling contracts all ended May in negative territory. The Partnership continued to post a loss in June on account of its long holdings of US Treasuries, European bonds, and contracts involving Eurodollar, Euribor and Short Sterling. In August, rising yields hurt long exposure to U.S. treasuries which was one of the largest negatives over the month. Similarly, bond holdings hurt performance in September as short exposure to debt from commodity-focused economies suffered. Long holdings of Italian bonds further delivered a loss with destabilization of the Italian coalition government resulting in heavy selling of the country’s debt. Some performance was recovered via long German and French bonds as higher grade fixed income attracted safe haven inflows from investors. Nevertheless, bond trading ultimately ended the year in December on a sour note as bond prices dropped following the Federal Reserve’s reduction in bond purchasing integral in its quantitative easing policy.

In contrast to bond and interest rate trading, equity positions largely generated positive results for the Partnership in 2013. Equity trading provided noteworthy results in January because of long equity exposure

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across all regions, including the US and European indices. Such long exposure continued to generate solid performance throughout the year although losses were sustained in U.S. and European stock indices when equities fell out of favor.

With respect to currency trading, short exposure to Japanese yen provided positive returns in January as the Japanese yen fell 6% on a trade-weighted basis following the announcement of stimulus and deflation control. Currency trading in February, however, provided mixed results as positive returns from shorting the British pound was offset by losses from short exposure to the US dollar. Continued trading strategies with respect to both the British pound and U.S. dollar produced the opposite effects in the months of March and April. In March, the short exposure to the US dollar largely resulted in positive returns while, in April, short positions in the British pound produced negative returns when the United Kingdom avoided a triple-dip recession. Currency trading became a notable performance detractor in the months following. In July, long exposure to the U.S. dollar suffered due to the U.S.’s continuing accommodative monetary policy. In August, losses were concentrated in long Eurodollar positions as better-than-expected data raised Eurozone interest rate expectations. The losses sustained in September were attributable to long exposure to the U.S. dollar, dollar pairs against emerging-market currencies, and both long and short Euro exposures. Short exposure to Eurodollar and Short Sterling particularly suffered as accommodative monetary policy in the U.S. lowered expectations for interest rates globally.

Commodity trading started off the year generating a gain, largely due to short electricity contracts as milder, wetter weather drove prices down. Long exposure to oil and oil derivatives and short gold exposure also returned positive numbers. Energy trading took a hit in February though, with all positions contributing to the loss. Long positions in crude oil, crude oil by-products, and base metals followed the same theme. In March, the commodity allocations also delivered negative performance on the whole, driven predominantly by a long exposure to energy markets. Exposure to crude oil and its derivatives caused the greatest losses as the portfolio was long at the start of the period and suffered as oil prices fell. The portfolio’s exposure was subsequently reduced, and thus, did not participate in some of the upward movement towards the end of the period. Although some profits were obtained through a short allocation to both precious and base metals in April, exposure to wheat and corn detracted from these gains. Conversely, agricultural trading in May posted a gain primarily through long soybeans and short sugar positions. Energies produced slightly negative returns in May with long natural gas adding a loss that short electricity and coal contacts partially offset. In June, short metals added a notable gain as prices of both base and precious metals fell sharply. The reverse was true in July when Chinese growth figures pushed up the price of base metals and precious metals also rose. Short positions in agriculturals similarly generated a loss from increased prices in cocoa, coffee and soy. Commodity trading in August produced mixed results as early gains from long exposures were lost after increased industrial production in China hurt short positions in base metals. September provided similarly mixed results. While short exposure to precious metals suffered losses, agricultural holdings produced positive results overall. High Midwest temperatures threatened to damage soybean crops and resulted in strong returns from long exposures to soybeans. Short corn positions further turned out to be profitable from larger-than-expected stockpiles of corn. Returns on energy trades were mixed as Middle East tensions created profit on long holdings of crude oil and oil prices subsequently dropped. Commodity trading in October also produced a loss as volatility in energy markets caused difficulties for directional trading. In contrast, short metal holdings generated positive gains in November after the price of gold and aluminum dropped throughout the month. Long soybean holdings additionally helped performance as US export demand increased. In the month of December, long crude oil holdings weighed the most on commodity trading profitability after Western countries and Iran reached an agreement over Iran’s nuclear program. The Partnership, however, still benefited from short positions on canola and wheat which sold off strongly through the month. Trading on metals produced mixed results in December.

The credit sector provided mixed performance results in 2013. Short exposure to European and US credit default protection initially captured gains in January as the cost of default insurance fell, but subsequently, created losses after the cost of European default protection rose. The Partnership did achieve positive gains in the credit sector during the fourth quarter, however, after credit markets continued to tighten to post-crisis lows.

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2012

Net assets decreased $148,314,876 for the year ended December 31, 2012. This decrease was attributable to subscriptions in the amount of $58,013,435, redemptions in the amount of $162,044,482 and net loss from operations of $44,283,829.

For the year ended December 31, 2012, the Partnership accrued or paid total expenses of $21,715,345, including $7,001,823 in servicing fees, $14,330,711 in General Partner administrative fees and Trading Advisor management fees, and $382,811 in other expenses. Interest of $278,092 was earned or accrued on the Partnership’s cash and cash equivalent investments.

The Net Asset Value of a Class A-1 Unit decreased by $279.41 to $2,884.47. The Net Asset Value of a Class B-1 Unit decreased by $279.41 to $2,884.48. The Net Asset Value of a Class A-2 Unit decreased by $251.54 to $3,023.40. The Net Asset Value of a Class B-2 Unit decreased by $251.53 to $3,023.42.

In equities trading, performance was negative for the month of January. As a general theme, profits from long positions in US indices were outweighed by shorts in Asian bourses. The stock sector led returns in February, however, as the increased market confidence benefited a broad long positioning. Long exposure to stock indices added gains in March via US and Japanese indices. The strongest returns came from long positions in the NASDAQ 100 and S&P 500 as each rose 4.2% and 3.1% respectively on the back of a flurry of positive new from the US. In April, the stock sector provided losses as broad long exposure suffered from the fall in global equities over the first half of the month. Losses were spread across regions, although US, German and Japanese indices were the main detractors. A general long exposure to stocks struggled in May as investors sold off risky assets. Stocks experienced volatility following elections in Europe and a plethora of negative news flows such as banking woes in Spain, JP Morgan’s trading loss and China’s slower growth. Exposure to stocks and energies hurt performance in June. Within stocks, exposure to European and US equities returned losses. Stocks surged in June after EU leaders pleasantly surprised investors by announcing that they had agreed new steps to support the EU’s troubled members. After a volatile few months, stock trading detracted from performance in November. A long stance to US indices generated losses, despite the S&P 500 and NASDAQ 100 rising 0.3% and 1.1% respectively, as losses incurred during the first half of November were not subsequently recouped. Amid the uncertainty, AHL returned a net profit in December to finish the year on a positive note. A broadly long exposure to equities was the main driver of performance, particularly from Japanese and other Asian Pacific index positions, as stocks benefitted from a well-received change of governing party in Japan, which was seen to be increasing the probability of new policies being adopted to stimulate Japanese growth.

Trading in bonds and short-term interest rates produced returns in January. Long positions in US Treasuries made up the majority of bond sector gains in January as prices jumped following the unexpected announcement by the Federal Reserve that interest rates would be held at near zero until at least 2014. In February, long exposure to fixed income assets dragged on performance as investors increasingly sought riskier assets during the month. Exposure to fixed income assets weighed on performance in March as safe haven assets fell out of favor. In bonds, long holdings of US Treasuries detracted the most from returns in March as prices fell following positive economic comments by the Federal Reserve which led to reduced expectations for further quantitative easing. Long-side exposure to bonds provided positive performance in April as investors increased their demand in the uncertain environment. German sovereign bonds were the main driver as general risk aversion, anxiety over unending Eurozone bailouts and less than encouraging economic indicator data added to demand for bonds. In May, long exposure to bonds largely drove performance as investors increasingly flocked to “safe haven” assets. In particular, positions in German bonds, US Treasuries and UK Gilts proved well placed. A long exposure to the fixed income sector benefited in June from periods of increased demand for perceived safe haven assets as investors sought to preserve capital amid heightened risk aversion. However, some gains were given back in June as investors participated in the rally in risk assets during mid-period and at month-end. In July, the long exposure to bonds and interest rates drove performance as the deteriorating economic picture spurred investors to prioritize capital preservation over growth. However, some gains were given back towards the month

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end and in August, long exposure to bonds continued to struggle as investors sold out of safe haven assets. In September, long exposure to bonds added to performance, with Italian and Japanese bonds being the most profitable. Bond holdings were negative in October as a result of long exposure to US Treasures, UK Gilts and bonds from commodity-focused economies. However, some gains were recovered by long exposure to French and Italian bonds. Long holdings of interest rate contracts also hurt performance over the period, notable detractors were Euribor and Eurodollar. Fixed income exposure also struggled in December as profits from long European and emerging market bonds were offset by losses from long positions in US Treasuries and Canadian bonds, in particular, as a result of US fiscal cliff negotiations.

Short positions in agricultural trading posted losses in January with exposure to cocoa and corn seeing some of the larger negative performances. The agricultural sector produced positive returns in March led by short coffee and long soya exposure. In July, long exposures to agriculturals proved well placed as fears of a renewed food shortage crisis re-emerged after droughts hit the U.S. and lowered supply expectations. In particular, corn and soya prices reached record levels while wheat prices remained elevated. However, short exposure to energies, especially crude oil and oil derivatives detracted from performance in July. Oil prices also benefited from anticipations of supply disruptions in August due to Western sanctions on Iran which came into effect from July, maintenance work in the North Sea and threats from Tropical Storm Isaac. In September, the energy allocation also lost value as long exposures to oil and short exposure to natural gas resulted in small losses.

In currencies, long US dollar exposure in January offset profits elsewhere in the sector as the greenback fell 1.3% on a trade-weighted basis after signs of an economic recovery in the US boosted investor risk appetite and saw the ‘safe-haven’ currency sell-off for much of the month. Long AUD/JPY proved the leading trade in February as the Australian dollar rallied after interest rates were left unchanged and hawkish Reserve Bank of Australia minutes led markets to revise their flat interest rate expectations. Whilst the US dollar ended the month of February flat on a trade weighted basis, some short US dollar pairs still added gains as increased risk appetite meant the greenback generally lost ground to emerging market and commodity-linked currencies. Trading in currencies added to losses overall in March, however. Short exposure to the US dollar suffered after the greenback rallied on better-than-expected US jobs and housing data. The currency sector contributed excellent returns in July, with short Euro pairs proving profitable after the ECB cut interest rates. In August, currency trading detracted the most from performance due to a lack of clear trends. Both long and short US dollar exposures ended with modest losses, while euro trading posted losses from general short positioning. A short stance in commodities weighed on returns, as prices were supported by weakness in the US dollar. Currency trading was up in September driven by short US dollar pairs which generated profits as news of QE3 put downward pressure on the US dollar. However, returns in September were pegged back as short euro positions suffered a loss across a host of currencies, with the single currency rising 1% on a trade-weighted basis. Currency trading added a small negative return in October. Short exposure to the US dollar (against commodity-linked currencies in particular) drove the losses as it rose 0.6% on a trade-weighted basis. On a positive note, currency pairs of long Asian currencies and short USD added gains. Currency trading continued to gain in November. Short US dollar positions (especially against emerging market and commodity-linked currencies) were the main return drivers. Additional gains came from short positions in the Japanese yen against the US and Australian dollar. The yen declined -3.3% on a trade-weighted basis, driven partly by the prospects of elections, expectations that the Bank of Japan may ease monetary policy aggressively and deterioration in Japan’s balance of payments. Currency trading proved rewarding in December, with short US dollar (especially against emerging market currencies) and short Japanese yen trades (particularly against USD, AUD, GBP and Euro) leading returns. US fiscal cliff negotiations weighed on the US dollar, whilst the Japanese yen weakened amid expectations of aggressive easing by Shinzo Abe’s new government.

The metals sector dragged on performance in 2012 with both precious and industrials detracting similar amounts. In the third quarter, aluminum, zinc and nickel contracts sustained the largest losses. However, precious metals especially did poorly, as long gold and silver exposures suffered a year-end sell off.

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2011

Net assets increased $71,477,500 for the year ended December 31, 2011. This increase was attributable to subscriptions in the amount of $184,077,163, redemptions in the amount of $66,387,092 and net loss from operations of $46,242,571.

For the year ended December 31, 2011, the Partnership accrued or paid total expenses of $23,668,015, including $7,631,473 in servicing fees, $15,559,687 in General Partner administrative fees and Trading Advisor management fees, and $476,855 in professional fees and other expenses. Interest of $765,963 was earned or accrued on the Partnership’s cash and cash equivalent investments.

The Net Asset Value of a Class A-1 Unit decreased by $307.37 to $3,163.88. The Net Asset Value of a Class B-1 Unit decreased by $307.37 to $3,163.89. The Net Asset Value of a Class A-2 Unit decreased by $273.38 to $3,274.94. The Net Asset Value of a Class B-2 Unit decreased by $273.38 to $3,274.95.

The almost weekly risk on/risk off nature of markets during the year hindered a large swathe of trend followers — particularly those deploying a fairly reactive trading approach, like the AHL Diversified Program — as positions were whipsawed on the back of sudden and sharp market reversals. Effective portfolio diversification (a key feature of the managed futures space) was also challenging as correlations amongst different asset classes remained particularly high. Many of the swings in sentiment were difficult to profit from as they were driven by short-term reactions to specific events (some of which were wholly unpredictable — such as March’s devastating earthquake in Japan, the Arab Spring uprisings and increased political uncertainty surrounding the Eurozone sovereign debt crisis), rather than market fundamentals.

Exposure to the stock sector in 2011 detracted the most from returns as global stock markets gyrated on uncertainty over the economic outlook combined with deep seated fears surrounding the outcome of the European sovereign debt crisis. Trading returns were negative for most of the year, apart from August when equity markets exhibited a more concerted sell-off.

Wild swings in Japanese indices and the effect of the Eurozone crisis on European indices caused the AHL Diversified Program the most challenges. March’s devastating earthquake in Japan significantly impacted our previously established long positions as Japanese equities outperformed in January and February on strong corporate earnings data. Unsurprisingly, long exposure to the Nikkei 225 and TOPIX suffered the most as both indices plunged over 8% during March and accounted for around 1% of losses for the AHL Diversified Program that month alone. Our systems subsequently reduced their long equity exposure and built up short positions in Asian stock indices. However, further losses were attributed to the Nikkei in May and June as shorts were hurt by prices moving higher on signs that the Japanese economy was recovering more quickly than expected. Nevertheless, short exposure to Asian indices clawed back some gains during the third quarter as economic indicators pointed to a slow-down in Chinese growth and the rising yen proved detrimental for Japan’s export led economy.

Europe’s sovereign debt problems remained in the spotlight for much of the year with sentiment see-sawing as investors weighed up fears of a debt default by Greece and rising yields in Spain and Italy against repeated assurances by Eurozone leaders that the crisis could be contained. From October, markets took on an air of optimism as Eurozone leaders appeared to be finally decisively tackling the crisis. This short term uncertainty made equities trading very difficult. Thus despite markets like Germany’s DAX index and France’s CAC 40 index ending the year down by 14.7% and 17.0% respectively, sharp reversals during the year meant that our trading returns for these 2 contracts combined was around -1.0%.

Oscillating risk sentiment caused similar problems in currency trading, particularly in terms of US dollar positions. The traditional safe-haven asset fell in and out of favor several times over the year, eventually ending down 1.0% (on a trade weighted basis) for the 12 month trading period. Particularly notable was the effect of a

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debate around the raising of the US debt ceiling and the subsequent downgrade of the nation’s credit rating at the start of August. In July, short positions were rewarded as uncertainty in the US briefly brought the currency’s status as a safe haven asset into question as risk-wary investors fled to the safety of alternative currencies, causing a monthly decline of 1.3% (on a trade-weighted basis). However, by August, despite the downgrade, the US dollars’ safe haven status appeared to have been reaffirmed and short positions significantly detracted as the currency rallied on safe haven buying.

Elsewhere in currency trading, the AHL Diversified Program was alert to the risks associated with government interventions throughout the year. For the yen, the Bank of Japan intervened several times during 2011, causing several steep short-term declines in the value of the Yen while the Swiss National Bank went a step further and announced a ceiling in CHF/EUR exchange rate of 1.20. Nevertheless, both the yen and franc ended the year up 6.9% and 1.7% respectively on a trade weighted basis despite these interventions. An important facet of the AHL Diversified Program’s response to these interventions has been active risk management and continuing to develop proactive risk management tools to strive to protect our funds from incurring large losses.

Returning to performance drivers, the whipsaw theme continued in energies as positions in both natural gas and crude oil detracted on the long and short side due a series of conflicting supply and demand issues. Pessimism over the global economic outlook raised demand fears for WTI crude oil at certain points during the year. At other times prices rallied strongly in line with global stock markets, resulting in WTI crude oil ending the year up 8.2% overall. However, the lack of persistent directional price movement proved challenging, meaning that the AHL Diversified Program lost almost 1.0% to crude oil trades over the year. Meanwhile, natural gas prices recorded a 32.1% fall for 2011. However this move masked huge price swings over the first half of the year in particular, which disadvantaged our tendency to favor faster systems for this market. As a result, this market detracted over 1.0% from the AHL Diversified Program’s trading performance for the 12 month period.

On the positive side, market volatility, whilst disturbing established trends in many markets, proved to be supportive for safe haven assets. This played out well for the AHL Diversified Program’s trading in both bonds and short-term interest rates. In particular, a general long exposure to bonds and interest rates proved significantly beneficial with the resulting gains going some way towards offsetting losses elsewhere. In bonds, long exposure to US Treasuries and German Bunds accrued some of the largest profits as safe havens rallied for much of the year. During the second and third quarters in particular, a weakening global economic outlook and the escalating European sovereign debt crisis weighed on sentiment and investors flocked to the relative safety of fixed income. In the short-term interest rate space, long Eurodollar and Euribor contracts benefitted from the Federal Reserve’s pledge to keep interest rates at close to zero for the next two years in response to subdued economic growth, along with expectations that rates would also remain low in the troubled Eurozone.

A key facet of the fixed income space this year has been the incredibly low yields in developed bonds. In particular, in Q3 10 year US Treasuries yielded as little as 1.7% while some interest rate contracts implied negative yields. While these low yields signal a challenge for trend followers going forward, the AHL Diversified Program’s approach has been two-fold: first, continue to diversify the fixed income portfolio, including bonds of developing countries and a variety of interest rate swaps; and second, implement relative value strategies that can potentially profit from an evolving yield curve. At the same time, the AHL Diversified Program has added risk management tools to balance the expected risk/return trade-off as interest rates approach zero.

In the metals sector precious metals performed well, particularly longs in gold and silver which benefitted from safe-haven inflows. Gold rallied particularly strongly in the middle of the year, reaching an all-time closing high of $1900.23 per troy ounce at the beginning of September as the US debt rating downgrade and growing concerns over European sovereign debt drove increasingly nervous sentiment. Some gains were given back when the rally came to an abrupt end shortly after this record high was reached. Investors moved to cash to cover

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losses following correlated declines across markets, causing gold prices to fall 11.1% for the month of September. However, following further volatile moves, prices still ended the year up 10.1% overall and the AHL Diversified Program’s long gold exposure added value for the year. However, elsewhere in metals trading, long copper positions detracted overall. Copper prices remained fairly range-bound for much of the year, save for a sharp over 20% fall in September as a drop in Chinese imports weighed on prices.

Item 7A. Quantitative and Qualitative Disclosures About Market Risk.

Introduction

Past Results Are Not Necessarily Indicative of Future Performance

The Partnership is a speculative commodity pool. Unlike an operating company, the risk of market sensitive instruments is integral, not incidental, to the Partnership’s main line of business.

Market movements result in frequent changes in the fair market value of the Partnership’s open positions and, consequently, in its earnings and cash flow. The Partnership’s market risk is influenced by a wide variety of factors, including the level and volatility of interest rates, exchange rates, equity price levels, the market value of financial instruments and contracts, the diversification effects among the Partnership’s open positions and the liquidity of the markets in which it trades.

The Partnership can rapidly acquire and/or liquidate both long and short positions in a wide range of different markets. Consequently, it is not possible to predict how a particular future market scenario will affect performance, and the Partnership’s past performance is not necessarily indicative of its future results.

Value at Risk is a measure of the maximum amount which the Partnership could reasonably be expected to lose in a given market sector. However, the inherent uncertainty of the Partnership’s speculative trading and the recurrence in the markets traded by the Partnership of market movements far exceeding expectations could result in actual trading or non-trading losses far beyond the indicated Value at Risk or the Partnership’s experience to date (i.e., “risk of ruin”). In light of the foregoing as well as the risks and uncertainties intrinsic to all future projections, the inclusion of the quantification included in this section should not be considered to constitute any assurance or representation that the Partnership’s losses in any market sector will be limited to Value at Risk or by the Partnership’s attempts to manage its market risk.

Materiality, as used in this section “Quantitative and Qualitative Disclosures About Market Risk,” is based on an assessment of reasonably possible market movements and the potential losses caused by such movements, taking into account the leverage, optionality and multiplier features of the Partnership’s market sensitive instruments.

Quantifying the Partnership’s Trading Value at Risk

Quantitative Forward-Looking Statements

The following quantitative disclosures regarding the Partnership’s market risk exposures contain “forward-looking statements” within the meaning of the safe harbor from civil liability provided for such statements by the Private Securities Litigation Reform Act of 1995 (set forth in Section 27A of the Securities Act and Section 21E of the Securities Exchange Act of 1934). All quantitative disclosures in this section are deemed to be forward-looking statements for purposes of the safe harbor, except for statements of historical fact.

The Partnership’s risk exposure in the various market sectors traded by the General Partner is quantified below in terms of Value at Risk. Due to the Partnership’s mark-to-market accounting, any loss in the fair value of the Partnership’s open positions is directly reflected in the Partnership’s earnings (realized or unrealized) and cash flow.

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For regulatory purposes, exchange initial margin requirements have been used by the Partnership as the measure of its Value at Risk. For trading and internal risk monitoring purposes, a different approach based on simulated market movements is used. Initial margin requirements include a credit risk factor and a maintenance margin factor and thus overstate the maximum one-day loss reflected by the maintenance margin requirement by the amount of the credit risk factor used in setting initial margin requirements. Maintenance margin requirements are set by exchanges to equal or exceed 95-99% of the maximum one-day losses in the fair value of any given contract incurred during the time period over which historical price fluctuations are researched for purposes of establishing margin levels. The maintenance margin levels are established by dealers and exchanges using historical price studies as well as an assessment of current market volatility (including the implied volatility of the options on a given futures contract) and economic fundamentals to provide a probabilistic estimate of the maximum expected near-term one-day price fluctuation.

In the case of market sensitive instruments that are not exchange traded, dealers’ margins have been used as Value at Risk.

The fair value of the Partnership’s futures and forward positions does not have any optionality component. However, the General Partner may also trade commodity options on behalf of the Partnership. The Value at Risk associated with options would be reflected in the margin requirement attributable to the instrument underlying each option.

In quantifying the Partnership’s Value at Risk, 100% positive correlation in the different positions held in each market risk category has been assumed. Consequently, the margin requirements applicable to the open contracts have simply been aggregated to determine each trading category’s aggregate Value at Risk. The diversification effects resulting from the fact that the Partnership’s positions are rarely, if ever, 100% positively correlated have not been reflected.

The Partnership’s Trading Value at Risk in Different Market Sectors

The following table indicates the average, highest and lowest amount of trading Value at Risk associated with the Partnership’s open positions by market category for the year ended December 31, 2013. During 2013, the Partnership’s average capitalization was approximately $270,915,352.

Average, highest and lowest Value at Risk amounts relate to the quarter-end amounts during the fiscal year. Average capitalization is the average of the Partnership’s capitalization at the end of each quarter during the fiscal year 2013.

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The following table indicates the average, highest and lowest amount of trading Value at Risk associated with the Partnership’s open positions by market category for the year ended December 31, 2012. During 2012, the Partnership’s average capitalization was $442,694,303.75.

Average, highest and lowest Value at Risk amounts relate to the quarter-end amounts during the fiscal year. Average capitalization is the average of the Partnership’s capitalization at the end of each quarter during the fiscal year 2012.

Material Limitations on Value at Risk as an Assessment of Market Risk

The face value of the market sector instruments held by the Partnership is typically many times the applicable initial or maintenance margin requirement (maintenance margin requirements generally ranging between approximately 1% and 10% of contract face value) as well as many times the capitalization of the Partnership. The magnitude of the Partnership’s open positions creates a “risk of ruin” not typically found in most other investment vehicles. Because of the size of its positions, certain market conditions — unusual, but historically recurring from time to time — could cause the Partnership to incur severe losses over a short period of time. The foregoing Value at Risk table — as well as the past performance of the Partnership — gives no indication of this “risk of ruin.”

Non-Trading Risk

The Partnership has non-trading market risk on its foreign cash balances not needed for margin. However, these balances (as well as any market risk they represent) are immaterial.

The Partnership also has non-trading cash flow risk as a result of holding a substantial portion (over 80%) of its assets in deposits, an AAA - rated Money Market Fund and interest-bearing bank accounts. This cash is placed with highly rated counterparties with a priority placed on preservation of capital and reputation (i.e., appropriate level of credit risk, market risk and reputation risk) and liquidity (i.e., appropriate level of liquidity risk).

Qualitative Disclosures Regarding Primary Trading Risk Exposures

The following qualitative disclosures regarding the Partnership’s market risk exposures — except for (i) those disclosures that are statements of historical fact and (ii) the descriptions of how the General Partner manages the Partnership’s primary market risk exposures — constitute forward-looking statements within the meaning of Section 27A of the Securities Act and Section 21E of the Securities Exchange Act. The Partnership’s primary market risk exposures as well as the strategies used and to be used by the General Partner for managing such exposures are subject to numerous uncertainties, contingencies and risks, any one of which could cause the actual results of the Partnership’s risk controls to differ materially from the objectives of such strategies. Government interventions, defaults and expropriations, illiquid markets, the emergence of dominant fundamental

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factors, political upheavals, changes in historical price relationships, an influx of new market participants, increased regulation and many other factors could result in material losses as well as in material changes to the risk exposures and the risk management strategies of the Partnership. There can be no assurance that the Partnership’s current market exposure and/or risk management strategies will not change materially or that any such strategies will be effective in either the short- or long-term. Investors must be prepared to lose all or substantially all of their investment in the Partnership.

The following were the primary trading risk exposures of the Partnership as of December 31, 2013, by market sector.

Financial Instruments. Interest rate movements directly affect the price of the sovereign bond futures positions held by the Partnership and indirectly the value of its stock index and currency positions. Interest rate movements in one country as well as relative interest rate movements between countries may materially impact the Partnership’s profitability. The Partnership’s primary interest rate exposure is to interest rate fluctuations in the United States, Germany, the UK, Australia and Japan. However, the Partnership also may take positions in futures contracts on the government debt of smaller nations. The General Partner anticipates that G-7 interest rates, both long-term and short-term, will remain the primary market exposure of the Partnership for the foreseeable future.

Currencies. Exchange rate risk is the principal market exposure of the Partnership. The Partnership’s currency exposure is to exchange rate fluctuations, primarily fluctuations which disrupt the historical pricing relationships between different currencies and currency pairs. These fluctuations are influenced by interest rate changes as well as political and general economic conditions. The Partnership trades in a large number of currencies, including cross-rates — i.e., positions between two currencies other than the U.S. dollar. As of December 31, 2013 the Partnership’s primary currency exposures were in the U.S. dollar versus the Euro, UK Sterling, Brazilian Real, Mexican Peso and Singapore Dollar. The primary exposures in the currency crosses were in the Euro versus Australian Dollar, Euro versus UK Sterling, UK Sterling versus Australian Dollar, Euro versus Swedish Krona and Australian Dollar versus Yen.

Stock Indices. The Partnership’s primary equity exposure, through stock index futures, is to equity price risk in the G-7 countries. As of December 31, 2013, the Partnership’s primary exposures were in the Dax, Nikkei, Korean Kospi, S&P 500 and Hang Seng. The Partnership is primarily exposed to the risk of adverse price trends or static markets in the major U.S., European and Asian indices. (Static markets would not cause major market changes but could make it difficult for the Partnership to avoid numerous small losses.)

Metals. The Diversified Portfolio used for the Partnership trades precious and base metals. The Partnership’s metals market exposure were in aluminum, gold, silver, copper, nickel and zinc.

Agricultural. The Partnership’s primary commodities exposure is to agricultural price movements, which are often directly affected by severe or unexpected weather conditions. Wheat, coffee, soybeans, cotton and corn accounted for the substantial bulk of the Partnership’s commodities exposure as of December 31, 2013.

Energy. The Partnership’s primary energy market exposure is to gas and oil price movements, often resulting from political developments in the Middle East and economic conditions worldwide. Energy prices are volatile and substantial profits and losses have been and are expected to continue to be experienced in this market. As of December 31, 2013, the main exposures were in crude oil, heating oil, gasoline, natural gas and gas oil.

Qualitative Disclosures Regarding Non-Trading Risk Exposure

The following were the only non-trading risk exposures of the Partnership as of December 31, 2013.

Foreign Currency Balances. The Partnership’s primary foreign currency balances are in Euro, Australian dollar, British pounds, Swedish krona and Japanese yen. The Partnership controls the non-trading risk of these balances by regularly converting these balances back into U.S. dollars (no less frequently than twice a month).

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Cash Positions. The Partnership’s only market exposure in instruments held other than for trading is in its cash portfolio. The Partnership holds only cash in deposits, an AAA rated Money Market Fund and interest-bearing bank accounts. This cash is placed with highly rated counterparties with a priority placed on preservation of capital and reputation (i.e. appropriate level of credit risk, market risk and reputation risk) and liquidity (i.e. appropriate level of liquidity risk) with durations no longer than 1 year.

Qualitative Disclosures Regarding Means of Managing Risk Exposure

Risk management is an essential component of AHL’s investment management process. AHL has put in place a risk management framework which is designed to identify, monitor and mitigate the portfolio, operational and outsourcing risks relevant to its operations. AHL’s risk management framework is part of, and is supported by, the overarching risk management framework of its parent company, Man Group plc. Key principles of AHL’s risk management framework include the segregation of functions and duties where material conflicts of interest may arise and having an appropriate degree of independent and senior management oversight of business activities. As part of this independent oversight, AHL’s activities are subject to regular review by an internal audit function.

The AHL Diversified Program employs a systematic, statistically based investment strategy that is designed to identify and capitalize on inefficiencies in markets around the world. The trading systems are quantitative and primarily directional in nature, meaning that investment decisions are entirely driven by mathematical models based on market trends and other historic relationships. Portfolio risk management consists primarily of monitoring risk measures and ensuring the systems remain within prescribed limits. The major risk monitoring measures and focus areas include value-at-risk, stress testing, implied volatility, leverage, margin-to-equity ratios and net exposures to sectors and different currencies.

Diversification is also a key feature of AHL’s risk management, as well as its investment, process. The AHL Diversified Program is diversified across over 100 markets covering a wide range of sectors including, without limitation, currencies, bonds, energies, stock indices, interest rates, metals and agriculturals. As well as emphasizing sector and market diversification, the AHL Diversified Program has been constructed to achieve diversification by combining various systems driven by powerful computerized trading algorithms, most of which work by sampling prices in real time and measuring price momentum and breakouts. Another important aspect of diversification is the fact that the various systems generate signals across different timeframes, ranging from two to three days to several months, which helps to reduce the risk of the AHL Diversified Program. In line with the principle of diversification, the approach to portfolio construction and asset allocation is premised on the importance of deploying investment capital across the full range of sectors and markets. Particular attention is paid to correlation of markets and sectors, expected returns, trading costs and market liquidity. Portfolios are regularly reviewed and, when necessary, adjusted to reflect changes in these factors. AHL also has a process for adjusting its market risk exposure in real time to reflect changes in the volatility, a measure of risk, of individual markets.

Item 8. Financial Statements and Supplementary Data.

Financial statements meeting the requirements of Regulation S-X are listed following this report as Exhibit 13.1 and are incorporated by reference into this Item 8.

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The following summarized quarterly financial information presents the results of operations for the periods ended March 31, June 30, September 30 and December 31, 2013 and 2012. This information has not been audited.

Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure.

None.

Item 9A. Controls and Procedures.

The General Partner, with the participation of the General Partner’s Chief Executive Officer and Chief Financial Officer with respect to the Partnership, has evaluated the effectiveness of the design and operation of the Partnership’s disclosure controls and procedures as of the end of the fiscal year for which this Annual Report on Form 10-K is being filed. Based on such evaluation, the Partnership’s Chief Executive Officer and Principal Financial Officer with respect to the Partnership have concluded that the Partnership’s disclosure controls and procedures were effective as of the fiscal year ended December 31, 2013.

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Changes in Internal Control over Financial Reporting

Section 404 of the Sarbanes-Oxley Act of 2002 requires the General Partner to evaluate annually the effectiveness of its internal controls over financial reporting as of the end of each fiscal year, and to include a management report assessing the effectiveness of its internal control over financial reporting in all annual reports. There were no significant changes in the General Partner’s internal control over financial reporting during the three-month period ended December 31, 2013 that have materially affected, or are reasonably likely to materially affect, the Partnership’s internal control over financial reporting.

Management’s Annual Report on Internal Control over Financial Reporting

The General Partner is responsible for establishing and maintaining adequate internal control over the financial reporting of the Partnership. Internal control over financial reporting is defined in Rules 13a-15(f) and 15d-15(f) under the Securities Exchange Act of 1934, as amended, as a process designed by, or under the supervision of, a company’s principal executive and principal financial officers and effected by a company’s board of directors, management and other personnel, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with the accounting principles generally accepted in the United States of America. The General Partner’s internal control over financial reporting includes those policies and procedures that:

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

The management of the General Partner assessed the effectiveness of its internal control over financial reporting with respect to the Partnership as of December 31, 2013. In making this assessment, management used the criteria set forth by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) in Internal Control — Integrated Framework. Based on its assessment, management has concluded that, as of December 31, 2013, the General Partner’s internal control over financial reporting with respect to the Partnership is effective based on those criteria.

There were no significant changes in the General Partner’s internal controls with respect to the Partnership or in other factors applicable to the Partnership that could significantly affect these controls subsequent to the date of their evaluation.

Item 9B. Other Information.

None.

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PART III

Item 10. Directors, Executive Officers and Corporate Governance.

(a, b) Identification of Directors and Executive Officers

(i) As a limited partnership, the Partnership itself has no directors or executive officers. The Partnership’s affairs are managed by the General Partner. Man Investments (USA) Corp., a Delaware corporation, is the general partner of the Partnership.

Mr. Eric Burl is the president of the General Partner and Ms. JingLu Eng is the senior managing fund accountant of the General Partner who serves as the Partnership’s principal financial officer and chief accounting officer. Their biographies are set forth below.

Eric Burl, born January, 1979, joined the General Partner in January 2013 and has served as its President since April 2013. In addition to his affiliation with the General Partner, Mr. Burl is also the President of GLG Inc., a hedge fund manager affiliated with the General Partner, serving in such capacity since January 2013. From November 2011 to November 2012, he was Head of Managed Accounts for Financial Risk Management Limited, Man’s multi-manager business (“FRM”), where he led the teams responsible for business development, product management and structuring of Man’s proprietary managed account platform. Prior to his role as Head of Managed Accounts for FRM, Mr. Burl was Head of Structured Products for Man and managed the team responsible for the investment management of Man’s multi-billion dollar structured product business. He joined Man Investments in June 2004 and has held a number of roles in Man’s multi-manager business including portfolio construction, quantitative analysis and product strategy and business development. Mr. Burl is listed with the CFTC as a Principal and associated person of the General Partner as of April 8, 2013 and listed with the CFTC as a Principal and associated person of GLG Inc. as of December 10, 2012. Mr. Burl received a BA (Hons) in management studies from the University of Nottingham in the United Kingdom and is CAIA certified.

JingLu Eng, age 44, is the Principal Financial Officer of Man Investments (USA) Corp. in its capacity as the General Partner of the Partnership. Prior to joining the General Partner in 2012, Ms. Eng was a senior manager within Investment Management division at Deloitte & Touche LLP, a U.S. audit, tax and advisory services firm, where her responsibilities included performing audits and attestation services for financial services firms, including hedge funds, private equity funds, commodity pools, fund of funds and mutual funds.

Ms. Eng received a BS in Accounting from Rutgers University, New Brunswick, New Jersey. She is a Certified Public Accountant in New Jersey and New York State and is a member of AICPA.

(c) Identification of Certain Significant Employees

None.

(d) Family Relationships

None.

(e) Business Experience

See Item 10 (a, b) above.

(f) Involvement in Certain Legal Proceedings

None.

(g) Promoters and Control Persons

Not applicable.

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(h) Code of Ethics

The Partnership has no employees, officers or directors and is controlled by the General Partner. The General Partner has adopted an Executive Code of Ethics that applies to its principal executive officers, principal financial officer and principal accounting officer. A copy of this Executive Code of Ethics may be obtained at no charge by written request to Man Investments (USA) Corp., 452 5^th Ave., 25^th Floor, New York, NY 10018 or by calling: (212) 649-6600 (ask for the Chief Legal Officer).

(i) Audit Committee Financial Expert

Because the Partnership has no employees or directors, the Partnership has no audit committee. The Partnership is managed by the General Partner. Ms. JingLu Eng, a senior managing fund accountant for the General Partner, serves as the Partnership’s “audit committee financial expert.” Ms. Eng is not independent of the management of the General Partner. The General Partner is not required to have, and does not have, independent directors.

Item 11. Executive Compensation.

The Partnership itself has no officers, directors or employees. None of the principals, officers or employees of the General Partner receive compensation from the Partnership. The General Partner invests all or substantially all of the Partnership’s assets in the Trading Company. The Trading Advisor makes all trading decisions for the Trading Company. The General Partner receives a monthly general partner administrative fee from the Partnership in an amount equal to 0.0833% of the month-end Net Asset Value of the Partnership (approximately a 1% annually). The Partnership pays the Trading Advisor, an affiliate of the General Partner, a monthly management fee in an amount equal to 0.1667% of the Partnership’s month-end Net Asset Value (approximately 2% annually) and 20% of any Net New Appreciation, described above under Item 1, achieved by the Partnership as of the end of each calendar month. The Trading Advisor may pay a portion of its management fees to the General Partner.

The officers and employees of the General Partner and Trading Advisor are compensated by the General Partner and Trading Advisor in their respective positions. These officers receive no other compensation from the Partnership. The Partnership has no compensation plans or arrangements relating to a change in control of either the Partnership, the General Partner or the Trading Advisor.

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters.

(a) Securities authorized for issuance under equity compensation plans

None.

(b) Security Ownership of Certain Beneficial Owners

The General Partner knows of no persons who own beneficially more than 5% of the Partnership’s Units. All of the Partnership’s general partner interest is held by the General Partner.

(c) Security Ownership of Management

The Partnership has no officers or directors. Under the terms of the Limited Partnership Agreement, the Partnership’s affairs are managed by the General Partner. As of December 31, 2013, the General Partner’s interest in the Partnership was valued at $504,667 which constituted 0.2% of total partners’ capital.

As of December 31, 2013, no director, executive officer or member of the General Partner beneficially owned Units in the Partnership.

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(d) Changes in Control

There are no arrangements known to the Partnership or General Partner the operation of which would result in a change in control of the Partnership; provided, however, that pursuant to the Partnership’s Limited Partnership Agreement, the General Partner may admit additional or substitute general partners and may withdraw as general partner of the Partnership.

Item 13. Certain Relationships and Related Transactions, and Director Independence.

The Partnership paid the General Partner and Trading Advisor aggregate administrative and management fees of $8,870,728 for the year ended December 31, 2013. The Partnership paid the Trading Advisor $0 in incentive fees for the year ended December 31, 2013. The Partnership paid Man Investments Inc., an affiliate of the General Partner and Trading Advisor that serves as the lead placement agent for the Partnership, $4,507,344 in servicing fees for the year ended December 31, 2013. The General Partner’s interest in the Partnership earned net loss of $32,923 for year ended December 31, 2013.

The Partnership has not and does not make any loans to the General Partner, its affiliates, their respective officers, directors or employees or the immediate family members of any of the foregoing, or to any entity, trust or other estate in which any of the foregoing has any interest, or to any other person (provided that the purchase of U.S. government instruments and the deposit of Partnership assets with banks, futures brokers and foreign exchange counterparties in connection with the trading operations of the Partnership are not considered to be loans).

None of the General Partner, its affiliates, their respective officers, directors and employees or the immediate family members of any of the foregoing, or any entity trust or other estate in which any of the foregoing has any interest has, to date, sold any asset, directly or indirectly, to the Partnership.

The Partnership has no directors, officers or employees and is managed by the General Partner. The General Partner is managed by its principals, none of whom is independent of the General Partner.

Item 14. Principal Accountant Fees and Services

(1) Audit Fees

The aggregate fees for professional services provided by Ernst & Young, LLP, the Partnership’s independent registered public accounting firm, for the audit of the Partnership’s annual financial statements and review of financial statements included in the Partnership’s quarterly reports for the years ended December 31, 2013 and 2012 were approximately $210,000 and $185,000, respectively.

(2) Audit-Related Fees

There were no fees for assurance and related services rendered by Ernst & Young, LLP for the years ended December 31, 2013 and 2012.

(3) Tax Fees

The aggregate fees for services rendered by Ernst & Young LLP for tax compliance, advice and planning services for the years ended December 31, 2013 and 2012 were approximately $424,000 and $118,000, respectively.

(4) All Other Fees

None.

(5) Pre-Approval Policies

Neither the Partnership nor the General Partner has an audit committee to pre-approve accountant and auditor fees and services. In lieu of an audit committee, the principals of the General Partner pre-approve all billings prior to the commencement of services.

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PART IV

Item 15. Exhibits and Financial Statement Schedules

(a)(1) Financial Statements

The financial statements required by this Item are included herewith as Exhibit 13.1.

(a)(2) Financial Statement Schedules

All Schedules are omitted for the reason that they are not required or are not applicable because equivalent information has been included in the financial statements or the notes thereto.

(a)(3) Exhibits as required by Item 601 of Regulation S-K

The following exhibits are included herewith.

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SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized, on March 27, 2014.

(Being the principal executive officer and the principal financial officer and chief accounting officer of Man Investments (USA) Corp. in its capacity as the General Partner of the Partnership.)

Man Investments (USA) Corp.

General Partner of Registrant

March 31, 2014

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Man-AHL

Diversified I L.P.

(A Delaware Limited Partnership)

Financial Statements as of and for the

Years Ended December 31, 2013, 2012 and 2011, with

Report of Independent Registered Public Accounting Firm

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INDEX TO FINANCIAL STATEMENTS

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Report of Independent Registered Public Accounting Firm

To the General Partner and Limited Partners of Man-AHL Diversified I L.P.

We have audited the accompanying statements of financial condition of Man-AHL Diversified I L.P. (the “Partnership”) as of December 31, 2013 and 2012, and the related statements of operations, changes in partners’ capital and cash flows for each of the two years in the period ended December 31, 2013. These financial statements are the responsibility of the Partnership’s management. Our responsibility is to express an opinion on these financial statements based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. We were not engaged to perform an audit of the Partnership’s internal control over financial reporting. Our audits included consideration of internal control over financial reporting as a basis for designing audit procedures that are appropriate in the circumstances, but not for the purpose of expressing an opinion on the effectiveness of the Partnership’s internal control over financial reporting. Accordingly, we express no such opinion. An audit also includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in all material respects, the financial position of Man-AHL Diversified I L.P. at December 31, 2013 and 2012, and the results of its operations, changes in partners’ capital and its cash flows for each of the two years in the period ended December 31, 2013, in conformity with U.S. generally accepted accounting principles.

/s/ERNST & YOUNG LLP

Chicago, Illinois

March 26, 2014

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		Deloitte & Touche LLP 111 S. Wacker Drive Chicago, IL 60606-4301 USA Tel: +1 312 486 1000 Fax: +1 312 486 1486 www.deloitte.com

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Partners of Man-AHL Diversified I L.P.:

We have audited the accompanying statement of financial condition of Man-AHL Diversified I L.P. (a Delaware Limited Partnership) (the “Partnership”) as of December 31, 2011, and the related statements of operations, changes in partners’ capital, and cash flows for the year then ended. These financials are the responsibility of the Partnership’s management. Our responsibility is to express an opinion on the financial statements based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. The Partnership is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. Our audit included consideration of internal control over financial reporting as a basis for designing audit procedures that are appropriate in the circumstances, but not for the purpose of expressing an opinion on the effectiveness of the Partnership’s internal control over financial reporting. Accordingly, we express no such opinion. An audit also includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audit provides a reasonable basis for our opinion.

In our opinion, such financial statements present fairly, in all material respects, the financial position of Man-AHL Diversified I L.P. as of December 31, 2011, and the results of its operations, changes in partners’ capital and its cash flows for the year then ended, in conformity with accounting principles generally accepted in the United States of America.

March 26, 2014

Member of                                      

Deloitte Touche Tohmatsu Limited

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MAN-AHL DIVERSIFIED I L.P.

(A Delaware Limited Partnership)

STATEMENTS OF FINANCIAL CONDITION

AS OF DECEMBER 31, 2013 AND 2012

See accompanying notes and attached financial statements of Man-AHL Diversified Trading Company L.P.

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MAN-AHL DIVERSIFIED I L.P.

(A Delaware Limited Partnership)

STATEMENTS OF OPERATIONS

FOR THE YEARS ENDED DECEMBER 31, 2013, 2012 AND 2011

See accompanying notes and attached financial statements of Man-AHL Diversified Trading Company L.P.

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MAN-AHL DIVERSIFIED I L.P.

(A Delaware Limited Partnership)

STATEMENTS OF CHANGES IN PARTNERS’ CAPITAL

FOR THE YEARS ENDED DECEMBER 31, 2013, 2012 AND 2011