HARTFORD INSURANCE GROUP, INC.

Critical Accounting Estimates

The preparation of financial statements in conformity with U.S. GAAP requires management 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, and in the past have differed, from those estimates.

The Company has identified the following estimates as critical in that they involve a higher degree of judgment and are subject to a significant degree of variability:

•property and casualty insurance product reserves, net of reinsurance;

•group LTD reserves, net of reinsurance;

•evaluation of goodwill for impairment;

•valuation of investments and derivative instruments including evaluation of credit losses on fixed maturities, AFS and ACL on mortgage loans; and

•contingencies relating to corporate litigation and regulatory matters.

In developing these estimates, management makes subjective and complex judgments that are inherently uncertain and subject to material change as facts and circumstances develop. Although variability is inherent in these estimates, management believes the amounts provided are appropriate based upon the facts available upon compilation of the financial statements. Certain of these estimates are particularly sensitive to market conditions, and deterioration and/or volatility in the worldwide debt or equity markets could have a material impact on the Condensed Consolidated Financial Statements.

The Company’s critical accounting estimates are discussed in Part II, Item 7 MD&A in the Company’s 2024 Form 10-K Annual Report. In addition, - Note 1 - Basis of Presentation and Significant Accounting Policies of Notes to Consolidated Financial Statements included in the Company's 2024 Form 10-K Annual Report should be read in conjunction with this section to assist with obtaining an understanding of the underlying accounting policies related to these estimates. The following discussion updates certain of the Company’s critical accounting estimates as of September 30, 2025.

Property & Casualty Insurance Product Reserves, Net of Reinsurance

P&C Loss and Loss Adjustment Expense Reserves, Net of Reinsurance, by Segment as of

September 30, 2025

Based on the results of the quarterly reserve review process, the Company determines the appropriate reserve adjustments, if any, to record. Recorded reserve estimates represent the Company's best estimate of the ultimate settlement amount of unpaid losses and loss adjustment expenses. The Company does not use statistical loss distributions or confidence levels in the process of determining its reserve estimate and, as a result, does not disclose reserve ranges. Assumptions used in arriving at the selected actuarial indications consider a number of factors, including the immaturity of emerged claims in recent accident years, emerging trends in the recent past, and the level of volatility within each line of business. In general, adjustments are made more quickly to more mature accident years and less volatile lines of business. Such adjustments of reserves are referred to as “prior accident year development”. Increases in previous estimates of ultimate loss costs are referred to as either an increase in prior accident year reserves or as unfavorable reserve development. Decreases in previous estimates of ultimate loss costs are referred to as either a decrease in prior accident year reserves or as favorable reserve development. Reserve development can influence the comparability of year over year underwriting results and is set forth in the paragraphs and tables that follow.

[1]The “loss and loss adjustment expense paid ratio” represents the ratio of paid losses and loss adjustment expenses to earned premiums and fee income.

[2]“Prior accident year development (pts)” represents the ratio of prior accident year development to earned premiums.

[1]The three months ended September 30, 2025, included a favorable change in losses of $(8), net of reinsurance, from the January 2025 California Wildfire Event. For the nine months ended September 30, 2025, catastrophe losses from the January 2025 California Wildfire Event were $305, net of reinsurance, and included losses of $54 in the global assumed reinsurance business.

[2]Catastrophe losses incurred on global assumed reinsurance business are not covered under the Company's per occurrence and aggregate property catastrophe treaties. For further information on the treaty, refer to Enterprise Risk Management — Insurance Risk section of this MD&A.

[1]Other reserve re-estimates, net for the three months ended September 30, 2025 includes a favorable change of $(6) in personal automobile physical damage reserves.

[2]The $8 change in deferred gain on retroactive reinsurance for the three months ended September 30, 2025 is related to amortization of the Navigators ADC deferred gain under retroactive reinsurance accounting.

[1]Other reserve re-estimates, net for the nine months ended September 30, 2025 includes a favorable change of $(26) in personal automobile physical damage reserves.

[2]The $64 change in deferred gain on retroactive reinsurance for the nine months ended September 30, 2025 is related to amortization of the Navigators ADC deferred gain under retroactive reinsurance accounting.

For discussion of the factors contributing to unfavorable (favorable) prior accident year reserve development for 2025, please refer to Note 9 - Reserve for Unpaid Losses and Loss Adjustment Expenses of Notes to Condensed Consolidated Financial Statements.

[1]The “loss and loss adjustment expense paid ratio” represents the ratio of paid losses and loss adjustment expenses to earned premiums and fee income.

[2]“Prior accident year development (pts)” represents the ratio of prior accident year development to earned premiums.

[1]For the three and nine months ended September 30, 2024, included losses from Hurricane Helene of $104, net of reinsurance, with $8 of the losses in the global assumed reinsurance business.

[2]Catastrophe losses incurred on global assumed reinsurance business are not covered under the Company's aggregate property catastrophe treaty. For further information on the treaty, refer to Enterprise Risk Management — Insurance Risk section of this MD&A.

[1]Other reserve re-estimates, net for the three months ended September 30, 2024 includes a favorable change of $(10) in personal automobile physical damage reserves.

[2]The $26 change in deferred gain on retroactive reinsurance for the three months ended September 30, 2024, is related to amortization of the Navigators ADC deferred gain under retroactive reinsurance accounting.

[1]Other reserve re-estimates, net for the nine months ended September 30, 2024 includes a favorable change of $(24) in personal automobile physical damage reserves.

[2]The $87 change in deferred gain on retroactive reinsurance for the nine months ended September 30, 2024 is related to amortization of the Navigators ADC deferred gain under retroactive reinsurance accounting.

For discussion of the factors contributing to unfavorable (favorable) prior accident year reserve development for 2024, please refer to Note 9 - Reserve for Unpaid Losses and Loss Adjustment Expenses of Notes to Condensed Consolidated Financial Statements.