AMBAC FINANCIAL GROUP INC

CRITICAL ACCOUNTING POLICIES AND ESTIMATES

Ambac's Consolidated Financial Statements have been prepared in accordance with GAAP. This section highlights accounting estimates management views as critical because they are most important to the portrayal of the Company's financial condition; and require management to make difficult and subjective judgments regarding matters that are inherently uncertain and subject to change. These estimates are evaluated on an on-going basis considering historical developments, political events, market conditions, industry trends and other information. There can be no assurance that actual results will conform to estimates and that reported results of operations will not be materially adversely affected by the need to make future accounting adjustments to reflect changes in these estimates from time to time.

Management has identified the following critical accounting policies and estimates: (i) valuation of financial guarantee loss and loss adjustment expense reserves, (ii) valuation of certain financial instruments and (iii) valuation of deferred tax assets. Management has discussed each of these critical accounting policies and estimates with the Audit Committee, including the reasons why they are considered critical and how current and anticipated future events impact those determinations. Additional information about these policies can be found in Note 2. Basis of Presentation and Significant Accounting Policies to the Consolidated Financial Statements included in Part II, Item 8 in this Form 10-K.

Valuation of Financial Guarantee Losses and Loss Expense Reserves (including Subrogation Recoverables)

The loss and loss adjustment expense reserves and subrogation recoverable assets (collectively defined as "loss reserves") discussed in this section relate solely to Ambac’s financial guarantee insurance policies issued to beneficiaries. A loss reserve is recorded on the balance sheet on a policy-by-policy basis at the present value ("PV") of expected net claim cash outflows or expected net recovery cash inflows, discounted at risk-free rates. The estimate for future net cash flows considers the likelihood of all possible outcomes that may occur from missed principal and/or interest payments on the insured obligation. This estimate also considers future recoveries related to remediation strategies and other contractual or subrogation-related cash flows.

The evaluation process for expected future net cash flows is subject to estimates and judgments regarding the probability of default by the issuer of the insured security, the probability of negotiation or settlement outcomes (which may include commutation, litigation and other settlements, and/or a refinancing), the probability of restructuring outcomes (which may include payment moratoriums, debt haircuts and/or subsequent recoveries) and the expected loss severity of credits for each insurance contract.

As the probability of default for an individual credit increases and/or the severity of loss given a default increases, our loss reserve for that insured obligation will also increase. Political, economic, environmental, credit or other unforeseen events could have an adverse impact on default probabilities and loss severities. The loss reserves for many transactions are derived from the issuer’s creditworthiness. For public finance issuers, loss reserves will consider not only creditworthiness, but also political dynamics and economic status and prospects. The loss reserves for transactions which have no direct issuer support, such as most structured finance exposures, including RMBS and student loan exposures, are derived from the default activity and the estimated loss given default of the underlying collateral supporting the transactions. In addition, many transactions have a combination of issuer/entity and collateral support. Loss reserves reflect our assessment of the transaction’s overall structure, support and expected performance. Loss reserve volatility will be a direct result of the credit performance of our insured portfolio, including the number, size, bond types and quality of credits included in our loss reserves; our ability to execute workout strategies and commutations; economic and market conditions; and management's judgments with regards to the current performance and future developments within the insured portfolio. The number and severity of credits included in our loss reserves depend to a large extent on transaction specific attributes, but will generally increase during periods of economic stress and decline during periods of economic prosperity. Reinsurance contracts may mitigate future loss reserve volatility. While Ambac currently has minimal exposure ceded to reinsurers on financial guarantee credits with loss reserves, the existing reinsurance contracts would reduce future volatility to the extent loss reserves are established on those risks ceded to reinsurers. Loss reserve volatility will also be materially impacted by changes in interest rates from period to period.

The table below indicates the gross par outstanding and gross loss reserves (including loss expenses) related to policies in Ambac’s Financial Guarantee loss and loss adjustment expense reserves at December 31, 2023 and 2022:

(1) Ceded par outstanding on policies with loss reserves and ceded loss and loss adjustment expense reserves are $362 and $30 respectively, at December 31, 2023, and $472 and $33, respectively at December 31, 2022. Ceded loss and loss adjustment expense reserves are included in Reinsurance recoverable on paid and unpaid losses.

(2) Gross Par Outstanding includes capital appreciation bonds, which are reported at the par amount at the time of issuance of the

insurance policy as opposed to the current accreted value of the bond.

(3) Loss and Loss Adjustment Expense reserves at December 31, 2023, of $559 are included in the balance sheet in the following line items: Loss and loss adjustment expense reserves: $696 and Subrogation recoverable: $137. Loss and Loss Adjustment Expense reserves at December 31, 2022, of $444 are included in the balance sheet in the following line items: Loss and loss adjustment expense reserves: $715 and Subrogation recoverable: $271.

(4) Ambac records as a component of its loss and loss adjustment expense reserves, estimated recoveries related to securitized loans in RMBS transactions that breached certain representations and warranties. Ambac has recorded gross estimated recoveries of $0 and $140 at December 31, 2023 and 2022, respectively.

See the Balance Sheet section of this Management's Discussion and Analysis of Financial Condition and Results of Operations below for a discussion on the reasons for changes to Gross Loss and Loss Adjustment Expense Reserves during 2023.

See Note 2. Basis of Presentation and Significant Accounting Policies to the Consolidated Financial Statements, included in Part II, Item 8 in this Annual Report on Form 10-K for a description of the cash flow and statistical methodologies used to develop loss reserves. The majority of our large loss reserves utilize the cash flow method of reserving. Various cash flow scenarios are developed to represent the range of possible outcomes and resultant future claim payments and timing. Scenarios and probabilities of each are adjusted regularly to reflect changes in status, outlook and our analysis and views. Significant judgment is used to develop the cash flow assumptions and related probabilities, and there can be no certainty that the scenarios or probabilities will not deviate materially from ultimate outcomes.

•In some cases, such as RMBS and student loans, cash flow projections include the modeling of a securitization's cash flows to determine the resources available to pay debt service on our insured obligations. During the first quarter of 2023, Ambac revised the model it uses to project RMBS collateral losses considering the seasoning of our RMBS exposure and management’s view that the most relevant determinant of prospective collateral performance is borrower payment status. Individual home price appreciation/depreciation has become less a critical determinant of performance considering the general appreciation in home values over the past few years as well as the impact of loan modifications. The average estimated loan-to-values of the collateral related to insured exposures have declined to under 50% from peaks above 110%. Key assumptions impacting student loan cash flow models include projected loan defaults, recoveries and interest rates. During the second quarter of 2023, we revised our approach to projecting future defaults to both reflect the student loan collateral's seasoning and generally stable performance.

•In other cases, such as many public finance exposures, we consider the issuer's overall ability and willingness to pay as it relates to the existing fiscal, economic, legal, restructuring and/or political framework relevant to a particular exposure or group of exposures. We then develop multiple scenarios where issuer debt service is paid, missed and/or haircut with claims paid then factor in any projected recovery amount (and potential variability of the recovery amount) and the timing thereof. There is no certainty our assumptions as to scenarios or probabilities will not be subject to material changes as developments occur.

•In estimating loss reserves, we may also incorporate scenarios which represent the potential outcome of remediation strategies. Remediation scenarios could include (i) a potential refinancing of the transaction by the issuer; (ii) the issuer’s ability to redeem outstanding securities at a discount, thereby increasing the structure’s ability to absorb future losses; and (iii) our ability to terminate, restructure or commute the policy in whole or in part. The remediation scenarios and the related probabilities of occurrence vary by policy depending on ongoing and expected discussions and negotiations with issuers and/or investors. In addition to commutation negotiations that are underway with various counterparties in various forms, our reserve estimates may also include scenarios which incorporate our ability and/or expectation to commute additional exposure with other counterparties.

Valuation of Certain Financial Instruments

The Fair Value Measurement Topic of the ASC requires financial instruments to be classified within a three-level fair value hierarchy. The fair value hierarchy, the financial instruments classified within each level, our valuation methods, inputs, assumptions and the review and validation procedures over quoted and modeled pricing are further detailed in Note 5. Fair Value Measurements to the Consolidated Financial Statements included in Part II, Item 8 in this Annual Report on Form 10-K.

The level of judgment in estimating fair value is largely dependent on the amount of observable market information available to fair value a financial instrument, which is also determinative of where the financial instrument is classified in the fair value hierarchy. Level 3 instruments are valued using models which use one or more significant inputs or value drivers that are unobservable and therefore require significant judgment. Level 3 financial instruments which are material include certain invested assets, uncollateralized interest rate swaps and investments and loan receivables of consolidated VIEs. Model-derived valuations of Level 3 financial instruments incorporate estimates of the effects of Ambac's own credit risk and/or counterparty credit risk, which can be complex and judgmental. Furthermore, Level 3 investments and loan receivables of consolidated VIEs incorporate estimates of Ambac's financial guarantee cash flows, including future premiums and losses. Such cash flow estimates require judgments regarding prepayments of VIE debt, loss probabilities and loss severities, all of which are inherently uncertain.

All models and related assumptions are continuously re-evaluated by management and enhanced, as appropriate, based on improvements in information and modeling techniques. The re-evaluation process includes a quarterly meeting of senior Finance personnel to review and approve changes to models and key assumptions.

As a result of the significant judgment for the above-described instruments, the actual trade value of the financial instrument in the market, or exit value of the financial instrument owned by Ambac, may be significantly different from its recorded fair value.

Valuation of Deferred Tax Assets

Our provision for taxes is based on our income, statutory tax rates and tax planning opportunities available to us in the jurisdictions in which we operate. Tax laws are complex and subject to different interpretations by the taxpayer and respective governmental taxing authorities. Significant judgment is required in determining our tax expense and in evaluating our tax positions. We review our tax positions quarterly and adjust the balances as new information becomes available. Deferred tax assets arise because of temporary differences between the financial reporting and tax bases of assets and liabilities, as well as from net operating loss ("NOL"). More specifically, deferred tax assets represent a future tax benefit that results from losses recorded under GAAP in a current period which are only deductible for tax purposes in future periods, future GAAP income that will not result in corresponding taxable income and NOL carry forwards.

Valuation allowances are established to reduce deferred tax assets to an amount that “more likely than not” will be realized. Management considers all available evidence, both positive and negative, when determining whether to establish and/or maintain a valuation allowance against deferred tax assets, with significant weight given to evidence that can be objectively verified. Positive evidence includes reduced potential for material loss as a result of settling RMBS representation and warranty litigation and resolving exposure to Puerto Rico, Everspan's receipt of an 'A-'' Financial Strength Rating from AM Best, the launch of a specialty program property and casualty insurance business, AFG's acquisition of majority interests in MGA/U businesses and AAC's reduction of material amounts of debt. Negative evidence includes Specialty Property and Casualty Insurance and Insurance Distribution businesses not yet at scale, the Legacy Financial Guarantee Insurance business remaining in run-off, and material amounts of debt at AAC.

The level of deferred tax asset recognition is influenced by management’s assessment of future expected taxable income, which depends on the existence of sufficient taxable income within the carry forward periods available under the tax law. As a result of the above-described risks and uncertainties associated with future operating results, management believes it is more likely than not that the Company will not generate sufficient taxable income to recover part or all the U.S. federal deferred tax asset and therefore has a full valuation allowance. To the extent such risks and uncertainties are resolved, Ambac may have the ability to establish a history of making reliable estimates of future income which could ultimately result in a reduction to the deferred tax asset valuation allowance. See Note 16. Income Taxes to the Consolidated Financial Statements, included in Part II, Item 8 in this Annual Report on Form 10-K for additional information on the Company's deferred income taxes.