Basis of Presentation and Significant Accounting Policies	12 Months Ended
Dec. 31, 2024
Accounting Policies [Abstract]
Basis of Presentation and Significant Accounting Policies	Basis of Presentation and Significant Accounting Policies The Company’s significant accounting policies are as follows: Basis of presentation These Consolidated Financial Statements reflect the historical balance sheets, statements of operations, statements of comprehensive income, statements of changes in stockholders’ equity and statements of cash flows of the Company. Within these Consolidated Financial Statements, Paulson and its related entities, as defined above, are considered “related parties.” The Consolidated Financial Statements are prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”). All dollar amounts, except per-share data in the text and tables herein, are stated in millions unless otherwise indicated. Transactions between the Company and its related parties are included in the Consolidated Financial Statements; however, material intercompany balances and transactions among the Company, Acadian LLC and consolidated Funds are eliminated in consolidation. Revenue recognition Revenue from contracts with customers The Company recognizes revenue when a customer obtains control of promised goods or services in an amount that reflects the consideration the entity expects to receive in exchange for those goods or services. A performance obligation is a promise in a contract to transfer a distinct good or service to the customer, and is the unit of account in accordance with the revenue recognition guidance. A contract’s transaction price is allocated to each distinct performance obligation and recognized as revenue when, or as, the performance obligation is satisfied. The majority of the Company’s contracts have a single performance obligation, as the promise to transfer the individual goods or services is not separately identifiable from other promises in the contracts and, therefore, not distinct. The Company’s management fee revenue is calculated based upon levels of assets under management multiplied by a fee rate. Management fee revenue is typically calculated on a monthly or quarterly basis, but is earned continuously as performance obligations are fulfilled. The transaction price is variable in contracts which calculate AUM on an average basis over a specified period and this variability is resolved at the end of the period, when the actual average AUM for the contract period may be calculated. The Company is able to resolve the variability and calculate the most likely amount to be recognized for any given period by estimating revenue based upon a daily average AUM. All of the Company’s performance obligations are satisfied ratably over time and there is no distinction in the methodology used to recognize management fee revenue in instances where there is more than one performance obligation. Typically, revenue is recognized over time using a time-based output measure to measure progress. Management fees are recognized monthly as services are rendered. Performance fees are generally assessed as a percentage of the investment performance realized on a client’s account. Performance fees are recognized when they (i) become billable to customers (based on contractual terms of agreements) and (ii) are not subject to contingent repayment. The Company is required to capitalize certain costs directly related to the acquisition or fulfillment of a contract with a customer. The Company has noted no instances where sales-based compensation or similar costs met the definition of an incremental cost to acquire a contract with a customer in accordance with revenue recognition guidance. There are no instances where the Company has incurred costs to fulfill a contract with a customer, therefore no assets related to contract acquisition or fulfillment have been recognized. For each one of its contracts with customers, the Company identifies one or more performance obligations within the contract and then, for each performance obligation, determines if it is a principal (where the nature of its promise is to provide a specified good or service itself) or an agent (where the nature of its promise is to arrange for a good or service to be provided by another party). In instances where a customer reimburses the Company for a cost paid on the customer’s behalf, if the Company is acting as a principal, the reimbursement is recorded on a gross basis and if the Company is acting as an agent, the reimbursement is recorded on a net basis. Revenue from other sources Revenue from other sources also includes interest income on cash and cash equivalents. Dividend income received is recorded on the ex-dividend date. Compensation arrangements The Company operates a short term variable compensation arrangement where generally, a percentage of Acadian LLC’s annual pre-variable compensation earnings, as defined in the arrangement, is allocated to a “pool” of Acadian LLC’s key employees, and subsequently distributed to individuals subject to recommendation and approval of a remuneration committee comprised of both the Company’s and Acadian LLC’s management. Additionally, a contractual percentage of Acadian LLC performance fee revenues and post-bonus profits are included in a deferred compensation pool. The deferred compensation pool is allocated to Acadian LLC key employees and is subject to a three-year vesting period. Variable compensation expense is accrued and recognized in the Consolidated Statements of Operations as services are provided by individual employees. Variable compensation also includes discretionary annual bonuses at the Hold Co, which may be paid in the form of cash or AAMI equity. The Company operates a longer term profit-interest plan whereby certain Acadian LLC key employees are granted (or have a right to purchase) awards representing a profits interest in Acadian LLC, as distinct from an equity interest due to the lack of pari passu voting rights. Under this plan, the Company may award a portion of the aforementioned variable compensation arrangement through issuance of a profits interest in Acadian LLC. The awards generally have a three-year vesting period from the grant date, and the service period begins at the commencement of the financial period to which the variable compensation relates. Under this plan, Acadian LLC key employees are eligible to share in the profits of Acadian LLC based on their respective percentage interest held. In addition, under certain circumstances, Acadian LLC key employees are eligible to receive repurchase payments upon exiting the plan based on a multiple of the last twelve months profits of Acadian LLC, as defined. Profits allocated and movements in the potential repurchase value, determined based on a fixed multiple times trailing twelve month profits, as defined, are recognized as compensation expense. Profit interests compensation liabilities are re-measured at each reporting date at the twelve month earnings multiple, with movements treated as compensation expense in the Company’s Consolidated Statements of Operations. Share-based compensation plans The Company recognizes the cost of all share-based payments to directors, senior management and employees, including grants of restricted stock and stock options, as compensation expense in the Consolidated Statements of Operations over the respective vesting periods. Awards made under the Company’s equity plans are accounted for as equity settled, and the grant date fair value is recognized as compensation expense over the requisite service period, with a corresponding contribution to additional paid-in capital. Valuation of restricted stock awards (“RSAs”) and restricted stock units (“RSUs”) is determined based on the Company’s closing share price as quoted on the New York Stock Exchange on the measurement date. For performance-based awards and stock options, a Monte-Carlo simulation model is used to determine the fair value. Key inputs for the model include: assumed reinvestment of dividends, risk-free interest rate, expected volatility and term. All excess tax benefits and deficiencies on share-based payment awards are recognized as income tax expense or benefit in the Consolidated Statements of Operations. In addition, the tax effects of exercised or vested awards are treated as discrete items in the reporting period in which they occur and excess tax benefits or deficiencies are classified with other income tax cash flows as an operating activity in the Consolidated Statements of Cash Flows. The Company recognizes forfeitures as they occur. The Company has compensation arrangements with Acadian LLC whereby in exchange for continued service, Acadian LLC equity is either purchased by, or granted to Acadian LLC key employees and may be repurchased by the Company at a future date, subject to service requirements having been met. Awards of equity made to Acadian LLC key employees are accounted for as cash settled, with the fair value recognized as compensation expense over the requisite service period, with a corresponding liability carried within other compensation liabilities on the Consolidated Balance Sheets until the award is settled. The fair value of the liability is determined with the assistance of third party valuation specialists using a discounted cash flow analysis which incorporates assumptions for the forecasted earnings information, growth rates, market risk adjustments, discount rates, when award holders maximize value and post-vesting restrictions. The liability is revalued at each reporting period, with any movements recorded within compensation expense. Consolidation The Company evaluates each of its subsidiaries and other operating entities to determine the appropriate method of accounting. Generally, majority-owned entities or otherwise controlled investments in which the Company holds a controlling financial interest as the principal shareholder, managing member, or general partner are consolidated. Funds In the normal course of business, Acadian LLC sponsors and manages certain investment vehicles (the “Funds”). The Company assesses consolidation requirements with respect to its Funds. In evaluating whether or not a legal entity must be consolidated, the Company determines if such entity is a variable interest entity (“VIE”) or a voting interest entity (“VOE”). A VOE is considered an entity in which (i) the total equity investment at risk is sufficient to enable the entity to finance its activities independently and (ii) the equity holders at risk have the obligation to absorb losses, the right to receive residual returns, and the right to direct the activities of the entity that most significantly impact the entity’s economic performance. A VIE is an entity that lacks one or more of the characteristics of a VOE. Assessing whether an entity is a VIE or VOE involves judgment and analysis. Factors considered in this assessment include the entity’s legal organization, the entity’s capital structure and equity ownership and any related party or de-facto agent implications of the Company’s involvement with the entity. Investments that are determined to be VIEs are consolidated if the Company or Acadian LLC is the primary beneficiary of the investment. In evaluating whether the Company is the primary beneficiary, the Company evaluates its economic interests in the entity held either directly by the Company or indirectly through related parties on a proportional basis. The primary beneficiary of the VIE is defined as the variable interest holder that has a controlling financial interest. A controlling financial interest is defined as (i) the power to direct the activities of the VIE that most significantly impacts its economic performance and (ii) the obligation to absorb losses of the entity or the right to receive benefits from the entity that could potentially be significant to the VIE. If no single party satisfies both criteria, but the Company and its related parties satisfy the criteria on a combined basis, then the primary beneficiary is the entity out of the related party group that is most closely associated to the VIE. The consolidation analysis can generally be performed qualitatively, however, if it is not readily apparent that the Company is not the primary beneficiary, a quantitative analysis may also be performed. The Company generally is not the primary beneficiary of Fund VIEs created to manage assets for clients unless the Company’s ownership interest in the fund, including interests of related parties on a proportional basis, is significant. The Company consolidates VOEs when it has control over significant operating, financial and investing decisions of the entity or holds the majority voting interest. Upon the occurrence of certain events (such as contributions and redemptions, either by the Company, Acadian LLC, or third parties, or amendments to the governing documents of the Company’s investees or sponsored Funds) management reviews and reconsiders its previous conclusion regarding the status of an entity as a VIE or a VOE. Additionally, management continually reconsiders whether the Company is deemed to be a VIE’s primary beneficiary who consolidates such entity. Investments and Investment Transactions Valuation of investments held at fair value Valuation of Fund investments is evaluated pursuant to the fair value methodology discussed below. Other investments are categorized as trading and recorded at estimated fair value. Realized and unrealized gains and losses arising from changes in fair value of investments are reported within net consolidated funds’ investment gains and losses in the Consolidated Statements of Operations. See Note 4 for a summary of the inputs utilized to determine the fair value of other investments held at fair value. Security transactions The Company generally records securities transactions on a trade-date basis. Realized gains and losses on securities transactions are generally determined on the average-cost method (net of foreign capital gain taxes) and for certain transactions determined based on the specific identification method. Income and expense recognition The Company records interest income on an accrual basis and includes amortization of premiums and accretion of discounts. Dividend income is recorded on the ex-dividend date, net of applicable withholding taxes. Expenses are recorded on an accrual basis. Short sales Certain Funds may sell a security they do not own in anticipation of a decline in the fair value of that security. When a Fund sells a security short, it must borrow the security sold short and deliver it to the broker-dealer through which it made the short sale. The short sales are secured by the long portfolio and available cash. The dollar value of which is at least equal to the market value of the security at the time of the short sale. The Fund records a gain, limited to the price at which the Fund sold the security short, or a loss, unlimited in size, upon the termination of a short sale. The amount of the gain or loss will be equal to the proceeds received in entering into the short sale less the cost of buying back the short security to close the short position. While the transaction is open, the Fund will incur an expense for any accrued dividends or interest which is paid to the lender of the securities. These short sales may involve a level of risk in excess of the liability recognized in the accompanying Consolidated Balance Sheets. The extent of such risk cannot be quantified. Funds’ Derivatives Certain Funds may use derivative instruments. The Funds’ derivative instruments may include foreign currency exchange contracts, credit default swaps, equity swaps, interest rate swaps, financial futures contracts and warrants. The fair values of derivative instruments are recorded as other assets of consolidated Funds or other liabilities of consolidated Funds on the Company’s Consolidated Balance Sheets. The Funds have used foreign exchange forwards to hedge the risk of movement in exchange rates on financial assets on a limited basis. The Company’s Funds have not designated any financial instruments for hedge accounting, as defined in the accounting literature, during the periods presented. The gains or losses on Fund’s derivative instruments not designated for hedge accounting are included as net consolidated Funds gains or losses in the Company’s Consolidated Statements of Operations. Foreign currency translation and transactions Assets and liabilities of non-U.S. entities for which the local currency is the functional currency are translated at current exchange rates as of the end of the accounting period. The related revenues and expenses are translated at average exchange rates in effect during the period. Net exchange gains and losses resulting from translation are excluded from income and are recorded as part of accumulated other comprehensive income (loss). Transactions denominated in a foreign currency are revalued at the current exchange rate at the transaction date and any related gains and losses are recognized in earnings. Fair value measurements In accordance with the accounting standards for fair value measurements, fair value is the price that the Company expects to be paid upon the sale of an asset or expects to pay upon the transfer of a liability in an orderly transaction between market participants. There is a three-level hierarchy for fair value measurements based upon the transparency of inputs to the valuation of an asset or liability. Inputs may be observable or unobservable and refer broadly to the assumptions that market participants would use in pricing the asset or liability. Observable inputs reflect the assumptions market participants would use in pricing the asset or liability based on market data obtained from independent sources. Unobservable inputs reflect the Company’s own conclusions about the assumptions that market participants would use in pricing the asset or liability based on the best information available in the circumstances. Each investment is assigned a level based upon the observability of the inputs which are significant to the overall valuation. Assets and liabilities measured and reported at fair value are classified and disclosed in one of the following categories: •Level I—Quoted prices are available in active markets for identical investments as of the reporting date. The type of investments included in Level I include listed equities and listed derivatives. As required by U.S. GAAP, the Company does not adjust the quoted price for these investments. •Level II—Pricing inputs are other than quoted prices in active markets, which are either directly or indirectly observable as of the reporting date, and fair value is determined through the use of models or other valuation methodologies utilizing observable market inputs other than quoted prices. Investments which are generally included in this category include corporate bonds, less liquid and restricted equity securities and certain over-the-counter derivatives. •Level III—Pricing inputs are unobservable for the asset or liability and include assets and liabilities where there is little, if any, market activity for the investment. The inputs into the determination of fair value require significant management judgment or estimation. In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, an investment’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the investment. In cases in which the fair value of an investment is established using the net asset value (or its equivalent) as a practical expedient, the investment is not categorized within the fair value hierarchy. Use of estimates The preparation of these Consolidated Financial Statements requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the period. Actual results could differ from such estimates, and the differences may be material to the Consolidated Financial Statements. Operating segment The Company currently operates in one reportable segment that provides investment management services and products primarily to institutional clients. See Note 21 for further information regarding the Company’s segment. Derivatives and Hedging The Company may utilize derivative financial instruments to hedge the risk of movement of interest rates and foreign currency on financial assets and liabilities. These derivative financial instruments may or may not qualify as hedges for accounting purposes. The Company records all derivative financial instruments as either assets or liabilities on its Consolidated Balance Sheets and measures these instruments at fair value. For a derivative financial instrument that qualifies as a hedge for accounting purposes and is designated as a hedging instrument, the effective portion of the derivative’s gain or loss is initially reported as a component of other comprehensive income (loss) and subsequently reclassified into earnings over the life of the hedge. The ineffective portion of the gain or loss is recognized in earnings immediately. Cash and cash equivalents The Company considers all highly liquid investments, including money market mutual funds, with original maturities of three months or less to be cash equivalents. Cash equivalents are stated at cost, which approximates market value due to the short-term maturity of these investments. Cash held by consolidated Funds is not available to fund general liquidity needs of the Company and is therefore also classified as restricted cash. Investment advisory fees receivable The Company earns management and performance fees which are billed monthly, quarterly and annually, according to the terms of the relevant investment management agreement. Management and performance fees that have been earned but have not yet been collected are presented as investment advisory fees receivable on the Consolidated Balance Sheets. Due to the short-term nature and liquidity of these receivables, the carrying amounts approximate their fair values. The Company typically does not record an allowance for doubtful accounts or bad debt expense, or any amounts recorded have been immaterial. Fixed assets Fixed assets are recorded at historical cost and depreciated using the straight-line method over their estimated useful lives. The estimated useful lives of office equipment and furniture and fixtures range from three to ten years. Leasehold improvements are amortized over the shorter of their estimated useful lives or the remaining term of the lease. Computer software developed or obtained for internal use capitalized during the application development stage is amortized using the straight-line method over the estimated useful life of the software, which is generally five years or less. The costs of improvements that extend the life of a fixed asset are capitalized, while the costs of repairs and maintenance are expensed as incurred. Goodwill The Company records goodwill when the consideration paid in a business acquisition exceeds the fair value of the net total of tangible assets acquired, identifiable intangible assets acquired and liabilities assumed. Goodwill is not amortized, but rather is tested for impairment annually or more frequently if events or circumstances occur that indicate impairment may exist. Factors that could trigger an impairment review include significant underperformance relative to historical or projected future operating results, significant changes in the Company’s use of the acquired assets in a business combination or the strategy for the Company’s overall business, and significant negative industry or economic trends. The Company performs its assessment for impairment of goodwill annually as of the first business day of the fourth quarter, or as necessary. The Company has determined that it had one reporting unit, consisting of Acadian LLC, as of the annual goodwill impairment test date. The Company first considers various qualitative factors to determine if it is more likely than not that the fair value of the reporting unit is greater than its respective carrying amount, including goodwill. If based on the qualitative assessment it is determined that it is more likely than not that the fair value of the reporting unit is below its respective carrying amount, therefore indicating that impairment may exist, the impact would be determined at that point through a quantitative assessment. For purposes of assessing potential impairment, the fair value of the reporting unit is estimated and compared to the carrying value of the reporting unit. The fair value of a reporting unit is based on discounted estimated future cash flows. The assumptions used to estimate fair value include management’s estimates of future growth rates, operating cash flows, discount rates and terminal value. These assumptions and estimates can change in future periods based on market movement and factors impacting the expected business performance. Changes in assumptions or estimates could materially affect the determination of the fair value of the reporting unit. If it is determined that the carrying value of the reporting unit exceeds its fair value, an impairment charge is recognized in the amount equal to that excess; not to exceed the total amount of goodwill allocated to that reporting unit. Based on the Company’s most recent annual goodwill impairment test, the Company concluded that the fair value of its reporting unit was more likely than not in excess of their carrying value. At the close of each year, management assessed whether there were any conditions present during the fourth quarter that would indicate impairment subsequent to the initial assessment date and concluded that no such conditions were present. Leases Contracts are evaluated at inception to determine whether such contract is or contains a lease. The Company leases certain office space and equipment under non-cancelable operating leases. As leases expire, they are normally renewed or replaced in the ordinary course of business. Lease agreements may contain renewal options exercisable by the Company, rent escalation clauses and/or other incentives provided by the landlord. Renewal options that have been determined to be reasonably certain to be exercised are included in the lease term. Rights and obligations attributable to identified leases with a term in excess of twelve months are recognized on the Company’s Consolidated Balance Sheets in the form of right‐of‐use (ROU) assets and operating lease liabilities are recognized as of the date the underlying assets are available for use, which may be the date the Company gains access to begin leasehold improvements. Lease payments related to short‐term leases with a term of twelve months or less are recognized on a straight‐line basis as short‐term lease expense. Operating lease liabilities are initially and subsequently measured as the present value of future lease payments over the lease term. For the purposes of this calculation, lease payments consist of fixed monthly lease payments related to use of the underlying assets. As the Company's leases generally do not have a readily determinable implicit rate, the company uses its incremental borrowing rate to determine the present value of fixed lease payments based on information available at the lease commencement date. ROU assets are initially valued equal to the corresponding lease liabilities, adjusted for any lease incentives payable to the Company. Subsequently, the amortization of ROU assets is recognized as a component of operating lease expense. The total cost of operating leases is recognized on a straight‐line basis over the life of the related leases, and is composed of imputed interest on lease liabilities measured using the effective interest method and amortization of the ROU asset. Variable lease payments are primarily related to services such as common‐area maintenance and utilities, property taxes and insurance, and are recognized as variable lease expense when incurred. ROU assets are tested for impairment whenever changes in facts or circumstances indicate that the carrying amount of an asset may not be recoverable. Modification of a lease term would result in re‐measurement of the lease liability and a corresponding adjustment to the ROU asset. Earnings per share The Company calculates basic and diluted earnings per share (“EPS”) by dividing net income by its shares outstanding as outlined below. Basic EPS attributable to the Company’s stockholders is calculated by dividing “Net income attributable to controlling interests” by the weighted-average number of shares outstanding. Diluted EPS is similar to basic EPS, but adjusts for the effect of potential shares of common stock unless they are antidilutive. For periods with a net loss, potential shares of common stock are considered antidilutive. The Company considers two ways to measure dilution to earnings per share: (a) calculate the net number of shares that would be issued assuming any related proceeds are used to buy back outstanding shares (the treasury stock method), or (b) assume the gross number of shares are issued and calculate any related effects on net income available for stockholders (the if-converted or two-class method). As appropriate, the Company’s policy is to apply the more dilutive methodology upon issuance of such instruments. Deferred financing costs The Company records debt issuance costs of term loans as a direct deduction from the carrying amount of the associated debt liability. For debt issuance costs of revolving credit loans, the Company presents debt issuance costs as an asset and subsequently amortizes the deferred costs ratably over the term of the agreement. Income taxes Deferred income taxes are recognized for the effects of temporary differences between the tax basis of an asset or liability and its reported amount in the Consolidated Financial Statements. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect of a change in tax rates on deferred tax assets and liabilities is recognized in income in the period that includes the enactment date. The Company’s deferred tax assets have been attributable to investment in partnerships and employee compensation. Deferred income tax assets are subject to a valuation allowance if, in management’s opinion, it is not more-likely-than-not that these benefits will be realized. In evaluating the Company’s ability to recover its deferred tax assets, the Company considers all available positive and negative evidence including its past operating results, the existence of cumulative earnings or losses in the most recent years and its forecast of future taxable income. In estimating future taxable income, the Company develops assumptions including the amount of future pre-tax operating income and the reversal of temporary differences. These assumptions require significant judgment about the forecasts of future taxable income and are consistent with the plans and estimates the Company is using to manage the underlying businesses. The Company’s accounting policy is to treat the global intangible low-taxed income taxes as period costs in the accounting and tax periods in which they are incurred. A tax benefit should only be recognized if it is more-likely-than-not that the position will be sustained based on its technical merits. The Company recognizes the financial statement benefit of a tax position only after considering the probability that a tax authority would uphold the position in an examination. For tax positions meeting a “more-likely-than-not” threshold, the amount recognized in the financial statements is the largest cumulative amount of benefit greater than 50% likely of being sustained. The more-likely-than-not threshold must continue to be met in each reporting period to support continued recognition of the benefit. Unrecognized tax benefits and related interest and penalties are adjusted periodically to reflect changing facts and circumstances. The Company’s accounting policy is to classify interest and related charges as a component of income tax expense. Non-controlling interests For certain entities that are consolidated, but not 100% owned, the Company reports non-controlling interests as equity on its Consolidated Balance Sheets. The Company's consolidated net income on the Consolidated Statements of Operations includes the income (loss) attributable to non-controlling interest holders of Funds. Ownership interests held by Acadian LLC key employees are categorized as liabilities on the Consolidated Balance Sheets and are revalued each reporting date, with movements treated as compensation expense in the Consolidated Statements of Operations. Non-controlling interests in consolidated Funds on the Consolidated Balance Sheets include undistributed income owned by the investors in the respective Funds. The Company’s consolidated net income on the Consolidated Statements of Operations includes the income (loss) attributable to non-controlling interest holders of these consolidated entities. Redeemable non-controlling interests The Company includes redeemable non-controlling interests related to certain consolidated Funds as temporary equity on the Consolidated Balance Sheets. Non-controlling interests in certain consolidated Funds are subject to monthly or quarterly redemption by the investors. When redeemable amounts become legally payable to investors, they are classified as a liability and included in total liabilities of consolidated Funds on the Consolidated Balance Sheets. Other comprehensive income (loss) Other comprehensive income (loss) is defined as the change in equity of a business enterprise during a period from transactions and other events and circumstances, excluding those resulting from investments by and distributions to owners. For the Company’s purposes, comprehensive income (loss) represents net income (loss), as presented in the accompanying Consolidated Statements of Operations, adjusted for foreign currency translation adjustments, net of tax and adjustments to the valuation and amortization of certain derivative securities, net of tax. Recently adopted accounting standards In November 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2023-07, Segment Reporting (Topic 280) - Improvements to Reportable Segment Disclosures. This amendment requires annual and interim disclosures of significant segment expenses that are regularly provided to the chief operating decision maker by reportable segment and clarifies that single reportable segment entities are required to apply all existing segment disclosures in the guidance. This amendment is effective for annual periods beginning after December 15, 2023 and for interim periods beginning after December 15, 2024. The Company adopted the updated guidance for the annual reporting period beginning January 1, 2024, which did not result in a material impact to our Consolidated Financial Statements. Refer to Note 21 for related disclosures about our reportable operating segments. New accounting standards not yet adopted In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740) - Improvements to Income Tax Disclosures, which requires public entities, on an annual basis, to provide disclosure of specific categories in the rate reconciliation, as well as disclosure of income taxes paid disaggregated by jurisdiction. This amendment is effective for annual periods beginning after December 15, 2024. The Company does not expect the additional disclosure requirements under ASU 2023-09 to have a material impact on the Consolidated Financial Statements. In March 2024, the FASB issued ASU 2024-01, Compensation - Stock Compensation (Topic 718), Scope Application of Profits Interest and Similar Awards. This standard provides clarity regarding whether profits interest and similar awards are within the scope of Topic 718 of the Accounting Standards Codification. This amendment is effective for annual periods beginning after December 15, 2024. Early adoption is permitted. The Company does not expect the adoption of ASU 2024-01 to have a material impact on the Consolidated Financial Statements. In November 2024, the FASB issued ASU 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-4): Disaggregation of Income Statement Expenses, which requires disclosures of additional information and disaggregation of certain expenses included in the income statement. This amendment is for annual periods beginning after December 15, 2026 and interim periods beginning after December 15, 2027. The Company is evaluating the impact that the adoption will have on the Consolidated Financial Statements and have not yet determined the transition approach. The Company has considered all other newly issued accounting guidance that is applicable to the Company’s operations and the preparation of the Consolidated Financial Statements, including those that have not yet been adopted. The Company does not believe that any such guidance has or will have a material effect on its Consolidated Financial Statements and related disclosures.

The Consolidated Financial Statements are prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”). All dollar amounts, except per-share data in the text and tables herein, are stated in millions unless otherwise indicated. Transactions between the Company and its related parties are included in the Consolidated Financial Statements; however, material intercompany balances and transactions among the Company, Acadian LLC and consolidated Funds are eliminated in consolidation.

A performance obligation is a promise in a contract to transfer a distinct good or service to the customer, and is the unit of account in accordance with the revenue recognition guidance. A contract’s transaction price is allocated to each distinct performance obligation and recognized as revenue when, or as, the performance obligation is satisfied. The majority of the Company’s contracts have a single performance obligation, as the promise to transfer the individual goods or services is not separately identifiable from other promises in the contracts and, therefore, not distinct. The Company’s management fee revenue is calculated based upon levels of assets under management multiplied by a fee rate. Management fee revenue is typically calculated on a monthly or quarterly basis, but is earned continuously as performance obligations are fulfilled. The transaction price is variable in contracts which calculate AUM on an average basis over a specified period and this variability is resolved at the end of the period, when the actual average AUM for the contract period may be calculated. The Company is able to resolve the variability and calculate the most likely amount to be recognized for any given period by estimating revenue based upon a daily average AUM.

The Company is required to capitalize certain costs directly related to the acquisition or fulfillment of a contract with a customer. The Company has noted no instances where sales-based compensation or similar costs met the definition of an incremental cost to acquire a contract with a customer in accordance with revenue recognition guidance. There are no instances where the Company has incurred costs to fulfill a contract with a customer, therefore no assets related to contract acquisition or fulfillment have been recognized.

For each one of its contracts with customers, the Company identifies one or more performance obligations within the contract and then, for each performance obligation, determines if it is a principal (where the nature of its promise is to provide a specified good or service itself) or an agent (where the nature of its promise is to arrange for a good or service to be provided by another party). In instances where a customer reimburses the Company for a cost paid on the customer’s behalf, if the Company is acting as a principal, the reimbursement is recorded on a gross basis and if the Company is acting as an agent, the reimbursement is recorded on a net basis.

The Company operates a short term variable compensation arrangement where generally, a percentage of Acadian LLC’s annual pre-variable compensation earnings, as defined in the arrangement, is allocated to a “pool” of Acadian LLC’s key employees, and subsequently distributed to individuals subject to recommendation and approval of a remuneration committee comprised of both the Company’s and Acadian LLC’s management. Additionally, a contractual percentage of Acadian LLC performance fee revenues and post-bonus profits are included in a deferred compensation pool. The deferred compensation pool is allocated to Acadian LLC key employees and is subject to a three-year vesting period. Variable compensation expense is accrued and recognized in the Consolidated Statements of Operations as services are provided by individual employees. Variable compensation also includes discretionary annual bonuses at the Hold Co, which may be paid in the form of cash or AAMI equity.

The Company operates a longer term profit-interest plan whereby certain Acadian LLC key employees are granted (or have a right to purchase) awards representing a profits interest in Acadian LLC, as distinct from an equity interest due to the lack of pari passu voting rights. Under this plan, the Company may award a portion of the aforementioned variable compensation arrangement through issuance of a profits interest in Acadian LLC. The awards generally have a three-year vesting period from the grant date, and the service period begins at the commencement of the financial period to which the variable compensation relates. Under this plan, Acadian LLC key employees are eligible to share in the profits of Acadian LLC based on their respective percentage interest held.

In addition, under certain circumstances, Acadian LLC key employees are eligible to receive repurchase payments upon exiting the plan based on a multiple of the last twelve months profits of Acadian LLC, as defined. Profits allocated and movements in the potential repurchase value, determined based on a fixed multiple times trailing twelve month profits, as defined, are recognized as compensation expense. Profit interests compensation liabilities are re-measured at each reporting date at the twelve month earnings multiple, with movements treated as compensation expense in the Company’s Consolidated Statements of Operations.

Awards made under the Company’s equity plans are accounted for as equity settled, and the grant date fair value is recognized as compensation expense over the requisite service period, with a corresponding contribution to additional paid-in capital. Valuation of restricted stock awards (“RSAs”) and restricted stock units (“RSUs”) is determined based on the Company’s closing share price as quoted on the New York Stock Exchange on the measurement date. For performance-based awards and stock options, a Monte-Carlo simulation model is used to determine the fair value. Key inputs for the model include: assumed reinvestment of dividends, risk-free interest rate, expected volatility and term. All excess tax benefits and deficiencies on share-based payment awards are recognized as income tax expense or benefit in the Consolidated Statements of Operations. In addition, the tax effects of exercised or vested awards are treated as discrete items in the reporting period in which they occur and excess tax benefits or deficiencies are classified with other income tax cash flows as an operating activity in the Consolidated Statements of Cash Flows. The Company recognizes forfeitures as they occur.

The Company has compensation arrangements with Acadian LLC whereby in exchange for continued service, Acadian LLC equity is either purchased by, or granted to Acadian LLC key employees and may be repurchased by the Company at a future date, subject to service requirements having been met. Awards of equity made to Acadian LLC key employees are accounted for as cash settled, with the fair value recognized as compensation expense over the requisite service period, with a corresponding liability carried within other compensation liabilities on the Consolidated Balance Sheets until the award is settled. The fair value of the liability is determined with the assistance of third party valuation specialists using a discounted cash flow analysis which incorporates assumptions for the forecasted earnings information, growth rates, market risk adjustments, discount rates, when award holders maximize value and post-vesting restrictions. The liability is revalued at each reporting period, with any movements recorded within compensation expense.

In evaluating whether or not a legal entity must be consolidated, the Company determines if such entity is a variable interest entity (“VIE”) or a voting interest entity (“VOE”). A VOE is considered an entity in which (i) the total equity investment at risk is sufficient to enable the entity to finance its activities independently and (ii) the equity holders at risk have the obligation to absorb losses, the right to receive residual returns, and the right to direct the activities of the entity that most significantly impact the entity’s economic performance. A VIE is an entity that lacks one or more of the characteristics of a VOE. Assessing whether an entity is a VIE or VOE involves judgment and analysis. Factors considered in this assessment include the entity’s legal organization, the entity’s capital structure and equity ownership and any related party or de-facto agent implications of the Company’s involvement with the entity. Investments that are determined to be VIEs are consolidated if the Company or Acadian LLC is the primary beneficiary of the investment.

In evaluating whether the Company is the primary beneficiary, the Company evaluates its economic interests in the entity held either directly by the Company or indirectly through related parties on a proportional basis. The primary beneficiary of the VIE is defined as the variable interest holder that has a controlling financial interest. A controlling financial interest is defined as (i) the power to direct the activities of the VIE that most significantly impacts its economic performance and (ii) the obligation to absorb losses of the entity or the right to receive benefits from the entity that could potentially be significant to the VIE. If no single party satisfies both criteria, but the Company and its related parties satisfy the criteria on a combined basis, then the primary beneficiary is the entity out of the related party group that is most closely associated to the VIE. The consolidation analysis can generally be performed qualitatively, however, if it is not readily apparent that the Company is not the primary beneficiary, a quantitative analysis may also be performed. The Company generally is not the primary beneficiary of Fund VIEs created to manage assets for clients unless the Company’s ownership interest in the fund, including interests of related parties on a proportional basis, is significant.

Upon the occurrence of certain events (such as contributions and redemptions, either by the Company, Acadian LLC, or third parties, or amendments to the governing documents of the Company’s investees or sponsored Funds) management reviews and reconsiders its previous conclusion regarding the status of an entity as a VIE or a VOE. Additionally, management continually reconsiders whether the Company is deemed to be a VIE’s primary beneficiary who consolidates such entity.

Valuation of Fund investments is evaluated pursuant to the fair value methodology discussed below. Other investments are categorized as trading and recorded at estimated fair value. Realized and unrealized gains and losses arising from changes in fair value of investments are reported within net consolidated funds’ investment gains and losses in the Consolidated Statements of Operations. See Note 4 for a summary of the inputs utilized to determine the fair value of other investments held at fair value.

Certain Funds may sell a security they do not own in anticipation of a decline in the fair value of that security. When a Fund sells a security short, it must borrow the security sold short and deliver it to the broker-dealer through which it made the short sale. The short sales are secured by the long portfolio and available cash. The dollar value of which is at least equal to the market value of the security at the time of the short sale. The Fund records a gain, limited to the price at which the Fund sold the security short, or a loss, unlimited in size, upon the termination of a short sale. The amount of the gain or loss will be equal to the proceeds received in entering into the short sale less the cost of buying back the short security to close the short position. While the transaction is open, the Fund will incur an expense for any accrued dividends or interest which is paid to the lender of the securities. These short sales

Certain Funds may use derivative instruments. The Funds’ derivative instruments may include foreign currency exchange contracts, credit default swaps, equity swaps, interest rate swaps, financial futures contracts and warrants. The fair values of derivative instruments are recorded as other assets of consolidated Funds or other liabilities of consolidated Funds on the Company’s Consolidated Balance Sheets. The Funds have used foreign exchange forwards to hedge the risk of movement in exchange rates on financial assets on a limited basis.

Assets and liabilities of non-U.S. entities for which the local currency is the functional currency are translated at current exchange rates as of the end of the accounting period. The related revenues and expenses are translated at average exchange rates in effect during the period. Net exchange gains and losses resulting from translation are excluded from income and are recorded as part of accumulated other comprehensive income (loss). Transactions denominated in a foreign currency are revalued at the current exchange rate at the transaction date and any related gains and losses are recognized in earnings.

In accordance with the accounting standards for fair value measurements, fair value is the price that the Company expects to be paid upon the sale of an asset or expects to pay upon the transfer of a liability in an orderly transaction between market participants. There is a three-level hierarchy for fair value measurements based upon the transparency of inputs to the valuation of an asset or liability. Inputs may be observable or unobservable and refer broadly to the assumptions that market participants would use in pricing the asset or liability. Observable inputs reflect the assumptions market participants would use in pricing the asset or liability based on market data obtained from independent sources. Unobservable inputs reflect the Company’s own conclusions about the assumptions that market participants would use in pricing the asset or liability based on the best information available in the circumstances. Each investment is assigned a level based upon the observability of the inputs which are significant to the overall valuation. Assets and liabilities measured and reported at fair value are classified and disclosed in one of the following categories:

•Level II—Pricing inputs are other than quoted prices in active markets, which are either directly or indirectly observable as of the reporting date, and fair value is determined through the use of models or other valuation methodologies utilizing observable market inputs other than quoted prices. Investments which are generally included in this category include corporate bonds, less liquid and restricted equity securities and certain over-the-counter derivatives.

In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, an investment’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the investment. In cases in which the fair value of an investment is established using the net asset value (or its equivalent) as a practical expedient, the investment is not categorized within the fair value hierarchy.

The preparation of these Consolidated Financial Statements requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the period. Actual results could differ from such estimates, and the differences may be material to the Consolidated Financial Statements.

The Company may utilize derivative financial instruments to hedge the risk of movement of interest rates and foreign currency on financial assets and liabilities. These derivative financial instruments may or may not qualify as hedges for accounting purposes. The Company records all derivative financial instruments as either assets or liabilities on its Consolidated Balance Sheets and measures these instruments at fair value. For a derivative financial instrument that qualifies as a hedge for accounting purposes and is designated as a hedging instrument, the effective portion of the derivative’s gain or loss is initially reported as a component of other comprehensive income (loss) and subsequently reclassified into earnings over the life of the hedge. The ineffective portion of the gain or loss is recognized in earnings immediately.

The Company earns management and performance fees which are billed monthly, quarterly and annually, according to the terms of the relevant investment management agreement. Management and performance fees that have been earned but have not yet been collected are presented as investment advisory fees receivable on the Consolidated Balance Sheets. Due to the short-term nature and liquidity of these receivables, the carrying amounts approximate their fair values. The Company typically does not record an allowance for doubtful accounts or bad debt expense, or any amounts recorded have been immaterial.

Fixed assets are recorded at historical cost and depreciated using the straight-line method over their estimated useful lives. The estimated useful lives of office equipment and furniture and fixtures range from three to ten years. Leasehold improvements are amortized over the shorter of their estimated useful lives or the remaining term of the lease. Computer software developed or obtained for internal use capitalized during the application development stage is amortized using the straight-line method over the estimated useful life of the software, which is generally five years or less. The costs of improvements that extend the life of a fixed asset are capitalized, while the costs of repairs and maintenance are expensed as incurred.

The Company records goodwill when the consideration paid in a business acquisition exceeds the fair value of the net total of tangible assets acquired, identifiable intangible assets acquired and liabilities assumed. Goodwill is not amortized, but rather is tested for impairment annually or more frequently if events or circumstances occur that indicate impairment may exist. Factors that could trigger an impairment review include significant underperformance relative to historical or projected future operating results, significant changes in the Company’s use of the acquired assets in a business combination or the strategy for the Company’s overall business, and significant negative industry or economic trends.

The Company performs its assessment for impairment of goodwill annually as of the first business day of the fourth quarter, or as necessary. The Company has determined that it had one reporting unit, consisting of Acadian LLC, as of the annual goodwill impairment test date. The Company first considers various qualitative factors to determine if it is more likely than not that the fair value of the reporting unit is greater than its respective carrying amount, including goodwill. If based on the qualitative assessment it is determined that it is more likely than not that the fair value of the reporting unit is below its respective carrying amount, therefore indicating that impairment may exist, the impact would be determined at that point through a quantitative assessment. For purposes of assessing potential impairment, the fair value of the reporting unit is estimated and compared to the carrying value of the reporting unit. The fair value of a reporting unit is based on discounted estimated future cash flows. The assumptions used to estimate fair value include management’s estimates of future growth rates, operating cash flows, discount rates and terminal value. These assumptions and estimates can change in future periods based on market movement and factors impacting the expected business performance. Changes in assumptions or estimates could materially affect the determination of the fair value of the reporting unit. If it is determined that the carrying value of the reporting unit exceeds its fair value, an impairment charge is recognized in the amount equal to that excess; not to exceed the total amount of goodwill allocated to that reporting unit. Based on the Company’s most recent annual goodwill impairment test, the Company concluded that the fair value of its reporting unit was more likely than not in excess of their carrying value. At the close of each year, management assessed whether there were any conditions present during the fourth quarter that would indicate impairment subsequent to the initial assessment date and concluded that no such conditions were present.

Contracts are evaluated at inception to determine whether such contract is or contains a lease. The Company leases certain office space and equipment under non-cancelable operating leases. As leases expire, they are normally renewed or replaced in the ordinary course of business. Lease agreements may contain renewal options exercisable by the Company, rent escalation clauses and/or other incentives provided by the landlord. Renewal options that have been determined to be reasonably certain to be exercised are included in the lease term. Rights and obligations attributable to identified leases with a term in excess of twelve months are recognized on the Company’s Consolidated Balance Sheets in the form of right‐of‐use (ROU) assets and operating lease liabilities are recognized as of the date the underlying assets are available for use, which may be the date the Company gains access to begin leasehold improvements. Lease payments related to short‐term leases with a term of twelve months or less are recognized on a straight‐line basis as short‐term lease expense.

Operating lease liabilities are initially and subsequently measured as the present value of future lease payments over the lease term. For the purposes of this calculation, lease payments consist of fixed monthly lease payments related to use of the underlying assets. As the Company's leases generally do not have a readily determinable implicit rate, the company uses its incremental borrowing rate to determine the present value of fixed lease payments based on information available at the lease commencement date.

ROU assets are initially valued equal to the corresponding lease liabilities, adjusted for any lease incentives payable to the Company. Subsequently, the amortization of ROU assets is recognized as a component of operating lease expense. The total cost of operating leases is recognized on a straight‐line basis over the life of the related leases, and is composed of imputed interest on lease liabilities measured using the effective interest method and amortization of the ROU asset. Variable lease payments are primarily related to services such as common‐area maintenance and utilities, property taxes and insurance, and are recognized as variable lease expense when incurred.

The Company calculates basic and diluted earnings per share (“EPS”) by dividing net income by its shares outstanding as outlined below. Basic EPS attributable to the Company’s stockholders is calculated by dividing “Net income attributable to controlling interests” by the weighted-average number of shares outstanding. Diluted EPS is similar to basic EPS, but adjusts for the effect of potential shares of common stock unless they are antidilutive. For periods with a net loss, potential shares of common stock are considered antidilutive.

The Company considers two ways to measure dilution to earnings per share: (a) calculate the net number of shares that would be issued assuming any related proceeds are used to buy back outstanding shares (the treasury stock method), or (b) assume the gross number of shares are issued and calculate any related effects on net income available for stockholders (the if-converted or two-class method). As appropriate, the Company’s policy is to apply the more dilutive methodology upon issuance of such instruments.

Deferred income taxes are recognized for the effects of temporary differences between the tax basis of an asset or liability and its reported amount in the Consolidated Financial Statements. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect of a change in tax rates on deferred tax assets and liabilities is recognized in income in the period that includes the enactment date. The Company’s deferred tax assets have been attributable to investment in partnerships and employee compensation.

Deferred income tax assets are subject to a valuation allowance if, in management’s opinion, it is not more-likely-than-not that these benefits will be realized. In evaluating the Company’s ability to recover its deferred tax assets, the Company considers all available positive and negative evidence including its past operating results, the existence of cumulative earnings or losses in the most recent years and its forecast of future taxable income. In estimating future taxable income, the Company develops assumptions including the amount of future pre-tax operating income and the reversal of temporary differences. These assumptions require significant judgment about the forecasts of future taxable income and are consistent with the plans and estimates the Company is using to manage the underlying businesses.

A tax benefit should only be recognized if it is more-likely-than-not that the position will be sustained based on its technical merits. The Company recognizes the financial statement benefit of a tax position only after considering the probability that a tax authority would uphold the position in an examination. For tax positions meeting a “more-likely-than-not” threshold, the amount recognized in the financial statements is the largest cumulative amount of benefit greater than 50% likely of being sustained. The more-likely-than-not threshold must continue to be met in each reporting period to support continued recognition of the benefit. Unrecognized tax benefits and related interest and penalties are adjusted periodically to reflect changing facts and circumstances. The Company’s accounting policy is to classify interest and related charges as a component of income tax expense.

For certain entities that are consolidated, but not 100% owned, the Company reports non-controlling interests as equity on its Consolidated Balance Sheets. The Company's consolidated net income on the Consolidated Statements of Operations includes the income (loss) attributable to non-controlling interest holders of Funds. Ownership interests held by Acadian LLC key employees are categorized as liabilities on the Consolidated Balance Sheets and are revalued each reporting date, with movements treated as compensation expense in the Consolidated Statements of Operations.

The Company includes redeemable non-controlling interests related to certain consolidated Funds as temporary equity on the Consolidated Balance Sheets. Non-controlling interests in certain consolidated Funds are subject to monthly or quarterly redemption by the investors. When redeemable amounts become legally payable to investors, they are classified as a liability and included in total liabilities of consolidated Funds on the Consolidated Balance Sheets.

Other comprehensive income (loss) is defined as the change in equity of a business enterprise during a period from transactions and other events and circumstances, excluding those resulting from investments by and distributions to owners. For the Company’s purposes, comprehensive income (loss) represents net income (loss), as presented in the accompanying Consolidated Statements of Operations, adjusted for foreign currency translation adjustments, net of tax and adjustments to the valuation and amortization of certain derivative securities, net of tax.

In November 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2023-07, Segment Reporting (Topic 280) - Improvements to Reportable Segment Disclosures. This amendment requires annual and interim disclosures of significant segment expenses that are regularly provided to the chief operating decision maker by reportable segment and clarifies that single reportable segment entities are required to apply all existing segment disclosures in the guidance. This amendment is effective for annual periods beginning after December 15, 2023 and for interim periods beginning after December 15, 2024. The Company adopted the updated guidance for the annual reporting period beginning January 1, 2024, which did not result in a material impact to our Consolidated Financial Statements. Refer to Note 21 for related disclosures about our reportable operating segments.

In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740) - Improvements to Income Tax Disclosures, which requires public entities, on an annual basis, to provide disclosure of specific categories in the rate reconciliation, as well as disclosure of income taxes paid disaggregated by jurisdiction. This amendment is effective for annual periods beginning after December 15, 2024. The Company does not expect the additional disclosure requirements under ASU 2023-09 to have a material impact on the Consolidated Financial Statements.

In March 2024, the FASB issued ASU 2024-01, Compensation - Stock Compensation (Topic 718), Scope Application of Profits Interest and Similar Awards. This standard provides clarity regarding whether profits interest and similar awards are within the scope of Topic 718 of the Accounting Standards Codification. This amendment is effective for annual periods beginning after December 15, 2024. Early adoption is permitted. The Company does not expect the adoption of ASU 2024-01 to have a material impact on the Consolidated Financial Statements.

In November 2024, the FASB issued ASU 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-4): Disaggregation of Income Statement Expenses, which requires disclosures of additional information and disaggregation of certain expenses included in the income statement. This amendment is for annual periods beginning after December 15, 2026 and interim periods beginning after December 15, 2027. The Company is evaluating the impact that the adoption will have on the Consolidated Financial Statements and have not yet determined the transition approach.