Significant Accounting Policies (Policies) |
9 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Sep. 30, 2026 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Man-AHL Diversified I L.P [Member] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accounting Policies [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Use of Estimates | Use of estimates — The preparation of financial statements in conformity with U.S. GAAP requires the General Partner to make estimates and assumptions that affect the reported amounts of assets and liabilities (and disclosure of contingent assets and liabilities) at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. |
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| Investment in Man-AHL Diversified Trading Company L.P. | Investment in Man-AHL Diversified Trading Company L.P. — The Partnership’s investment in the Trading Company is valued at the fair value of the Partnership’s proportionate interest in the partners’ capital of the Trading Company. The fair value of the Partnership’s investment in the Trading Company approximates the carrying amounts presented in the Statements of Financial Condition. The Partnership records its proportionate share of the Trading Company’s income, expenses, and realized and unrealized gains and losses. Investment transactions are recorded on a trade-date basis. In addition, the Partnership accrues its own expenses. The performance of the Partnership is directly affected by the performance of the Trading Company. Attached are the financial statements of the Trading Company, including the condensed schedules of investments, which are an integral part of these financial statements. Valuation of investments held by the Trading Company is discussed in the Trading Company’s notes to financial statements. As at September 30, 2026 and December 31, 2025, the Partnership owned 1,729.78 and 1,984.83 units, respectively, of the Trading Company. The Partnership’s aggregate ownership percentage of the Trading Company as at September 30, 2026 and December 31, 2025 was 44.69% and 45.32%, respectively. The Partnership is able to redeem its investment from the Trading Company on a monthly basis. As at September 30, 2026 and December 31, 2025, the Partnership could redeem its investment without restriction at the month-end net asset value of the Trading Company. |
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| Due from Man-AHL Diversified Trading Company L.P. | Due from Man-AHL Diversified Trading Company L.P. — The amounts Due from Man-AHL Diversified Trading Company L.P. represent redemption requests made by the Partnership relating to its investment in the Trading Company. The requests have been received and recorded by the Trading Company but the proceeds have not been received by the Partnership. These amounts are ultimately due to limited partners of the Partnership as redemptions payable. |
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| Expenses | Expenses — The Advisor earns a monthly management fee in an amount equal to 0.1667% (2% annually) of the Partnership’s month-end Net Asset Value, as defined in the Limited Partnership Agreement (the “Agreement”). In addition, the General Partner earns a monthly general partner fee in an amount equal to 0.0833% (1% annually) of the month-end Net Asset Value of Class A Series 1 and Class B Series 1 units. The general partner fee is included in management fees in the Statements of Operations. The Advisor also earns a monthly incentive fee equal to 20% of any Net New Appreciation, as defined in the Agreement, achieved by the Partnership, with new appreciation generally tracked on a class-by-class basis. The incentive fee is retained by the Advisor even if subsequent losses are incurred; however, no subsequent incentive fees will be paid to the Advisor until any such trading losses are recouped by the Partnership. Because the incentive fees are paid on the Net New Appreciation of the Partnership as a whole, it is possible that certain Limited Partners may experience increases in the Net Asset Value of their units while paying no incentive fees on such increases in the Net Asset Value of such units as a result of the timing of the purchase of units. During the three and nine month periods ended September 30, 2026 and 2025, no incentive fees were earned by the Advisor. The Partnership pays a monthly servicing fee to MII in an amount equal to 0.0833% (1.00% annually) of the month-end Net Asset Value of Class A Series 1 and Class B Series 1 units and 0.0625% (0.75% annually) of the month-end Net Asset Value of Class A Series 2 and Class B Series 2 units. |
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| Revenue Recognition | Revenue recognition — Income and expense are recognized on an accrual basis in the period in which they are incurred. |
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| Derivative Contracts | Derivative contracts — The Partnership’s operating activities involve trading, indirectly through its investment in the Trading Company, in derivative contracts that involve varying degrees of market and credit risk. With respect to the Partnership’s investment in the Trading Company, the Partnership has limited liability, and, therefore, its maximum exposure to either market or credit loss is limited to the carrying value of its investment in the Trading Company, as set forth in the Statements of Financial Condition. |
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| Income Taxes | Income taxes — The Partnership is not subject to federal, state, or local income tax. Such taxes are the liabilities of the individual partners and the amounts thereof will vary depending on the individual situation of each partner. Accordingly, there is no provision for income taxes in the accompanying financial statements. ASC 740, Income Taxes, defines how uncertain tax positions should be recognized, measured, presented, and disclosed in the financial statements and is applied to all open tax years. The Partnership has evaluated tax positions taken or expected to be taken in the course of preparing the Partnership’s tax returns to determine whether the tax positions are more-likely-than-not to be sustained by the applicable tax authority. Based on this analysis of all tax jurisdictions and all open tax years subject to examination, there were no material tax positions not deemed to meet a more-likely-than-not-threshold. Therefore, no tax expense, including interest or penalties, was recorded for the three and nine month periods ended September 30, 2026 and 2025. To the extent that the Partnership records interest and penalties, they would be included in interest expense and other expenses, respectively, in the Statements of Operations. The following is the major tax jurisdiction for the Trading Company and the earliest tax year subject to examination: United States – 2023. |
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| Net Income/(Loss) Per Unit | Net income/(loss) per unit — Net income/(loss) per unit of Class A Series 1, Class A Series 2, or Class B Series 1, partnership interest is equal to the net income/(loss) per class divided by the weighted average number of units outstanding per class. Weighted average number of units outstanding is the average of the units outstanding for each day during the periods ended September 30, 2026 and 2025. |
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| Other Income | Other income — Other income included in the Statements of Operations includes the proceeds received by the Trading Company relating to a class action award for the nine months ended September 30, 2026. |
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| Comparative Information | Comparative information — Certain prior year/period figures in the financial statements have been reclassified to conform with the current period presentation. |
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| Man-AHL Diversified Trading Company L.P. [Member] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Accounting Policies [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Use of Estimates | Use of estimates — The preparation of financial statements in conformity with U.S. GAAP requires the General Partner to make estimates and assumptions that affect the reported amounts of assets and liabilities (and disclosure of contingent assets and liabilities) at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. |
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| Due from Brokers | Due from brokers — Due from brokers may consist of balances due from BNP Paribas (“BNP”), Citigroup, N.A. (“Citi”), Credit Suisse Securities (USA) (“CS”), J.P. Morgan Chase Bank, N.A. and J.P. Morgan Securities LLC (“JPM”), Natwest f/k/a Royal Bank of Scotland (“RBS”), Deutsche Bank AG, London Branch (“DB”), Merrill Lynch, Pierce, Fenner & Smith Incorporated (“ML”), HSBC (“HSBC”) and Goldman Sachs (“GS”) (the “Brokers”). Due from brokers may consist of balances receivable from its Brokers, as well as The Bank of New York Mellon relating to securities or contracts, the Trading Company has sold or entered into, but have not yet settled as at September 30, 2026. In general, the brokers pay the Trading Company interest monthly, based on agreed upon rates, on the Trading Company’s average daily balance. |
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| Due to Brokers | Due to brokers — Due to brokers may consist of balances owed to its Brokers, as well as balances due to The Bank of New York Mellon relating to securities or contracts, the Trading Company has purchased or entered into, but have not yet settled as at September 30, 2026. The amount included in due to brokers in the Statements of Financial Condition is $679,875 and $Nil as at September 30, 2026 and December 31, 2025, respectively. |
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| Restricted Cash | Restricted cash — Restricted cash is subject to a legal or contractual restriction by third parties as well as a restriction as to withdrawal or use, including restrictions that require the funds to be used for a specified purpose and restrictions that limit the purpose for which the funds can be used. The Trading Company considers cash held at counterparties for derivative contracts to be restricted cash.
The amount of cash and cash equivalents and restricted cash is described in the table below:
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| Revenue Recognition | Revenue recognition — Income and expenses are recognized on an accrual basis in the period in which they are incurred. Realized gains and losses from periodic payments and settlements and unrealized changes in fair values are included in realized gains/(losses) and change in unrealized appreciation/(depreciation) on contracts/agreements, respectively, in the Statements of Operations. All trading activities are accounted for on a trade-date basis. The cost of securities sold is accounted for on a first in first out basis. Premiums and discounts on debt securities are amortized using the effective interest method and included within interest income in the Statements of Operations. |
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| Derivative Contracts | Derivative contracts — In the normal course of business, the Trading Company enters into derivative contracts (“derivatives”) for trading purposes. Derivatives traded by the Trading Company include futures and forward contracts and swap agreements. The Trading Company records derivatives at fair value. Futures contracts, which are traded on a national exchange, are valued at the close price as of the valuation day, or if no sale occurred on such day, at the close price on the most recent date on which a sale occurred. Forward contracts, which are not traded on a national exchange, are valued at fair value using independent pricing services, which mainly use market observable inputs in their valuations. Swaps are contractual agreements between two parties to exchange streams of payments over time based on specified notional amounts. The Trading Company’s swap agreements may consist of interest rate swaps and credit default swaps. Swap agreements are valued at fair value using independent pricing services. Upfront premiums paid or received by the Trading Company upon entering a credit default swap agreement are treated as part of the cost/proceeds of the credit default swap agreement and are reflected as part of net premiums paid or received in the Statements of Financial Condition. Upon termination of a credit default swap transaction, the amount included in the cost is reversed and becomes part of realized gain or loss. |
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| Foreign Currency | Foreign currency — All assets and liabilities of the Trading Company denominated in foreign currencies are translated into U.S. dollar amounts at the mean between the bid and ask market rates for such currencies on the date of valuation. Purchases and sales of foreign investments are converted at the prevailing rate of exchange on the respective date of such transactions. The Trading Company does not isolate that portion of realized gains and losses on investments which is due to changes in foreign exchange rates from that which is due to changes in market prices of the investments. Such changes are included with the net realized gains or losses on trading activities. |
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| Cash and Cash Equivalents | Cash and cash equivalents — Cash and cash equivalents include unrestricted cash, short-term interest-bearing money market accounts and U.S. government securities with original maturities of 90 days or less, held with The Bank of New York Mellon. As at September 30, 2026 and December 31, 2025, the Trading Company maintains cash balances with The Bank of New York Mellon. As at September 30, 2026 and December 31, 2025, the Trading Company held foreign cash balances of $15,495 and $14 with a cost of $13,682 and $12, respectively, which are included in cash and cash equivalents. As at September 30, 2026 and December 31, 2025, the Trading Company did not hold any U.S. Treasury Bills in cash and cash equivalents. |
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| Investments in Securities | Investments in securities — Investments in Securities include with original maturities of more than 90 days, held with The Bank of New York Mellon. |
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| Income Taxes | Income Taxes — The Trading Company is treated as a partnership for tax purposes and therefore is not subject to federal, state, or local income tax. Such taxes are the liabilities of the individual partners and the amounts thereof will vary depending on the individual situation of each partner. Accordingly, there is no provision for income taxes in the accompanying financial statements. ASC 740, Income Taxes, defines how uncertain tax positions should be recognized, measured, presented, and disclosed in the financial statements and is applied to all open tax years. The Trading Company has evaluated tax positions taken or expected to be taken in the course of preparing the Trading Company’s tax returns to determine whether the tax positions are more likely than not to be sustained by the applicable tax authority. Based on this analysis of all tax jurisdictions and all open tax years subject to examination, there were no material tax positions not deemed to meet a more-likely-than-not-threshold. Therefore, no tax expense, including interest or penalties, was recorded for the three and nine month periods ended September 30, 2026 and 2025. To the extent that the Trading Company records interest and penalties, they would be included in interest expense and other expenses, respectively, in the Statements of Operations. The following is the major tax jurisdiction for the Trading Company and the earliest tax year subject to examination: United States – 2023. |
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| Net Income/(Loss) Per Unit | Net income/(loss) per unit — Net income/(loss) per unit of partnership interest is equal to the net income/(loss) divided by the weighted average number of units outstanding. Weighted average number of units outstanding is the average of the units outstanding for each day during the periods ended September 30, 2026 and 2025. |
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| Other Income | Other Income — Other income included in the Statements of Operations includes the proceeds received by the Trading Company relating to a class action award for the period ended September 30, 2026. |
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| Comparative Information | Comparative Information — Certain prior year/period figures in the financial statements have been reclassified to conform with the current period presentation. |
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