M&T BANK CORP

A discussion of the Company's critical accounting estimates and significant accounting policies can be found in M&T's 2025 Annual Report. A summary of recent accounting developments is included in note 1 of Notes to Financial Statements, including the Company's election on January 1, 2026 to prospectively measure its residential mortgage loan servicing right assets at fair value, which the Company considers to be a critical accounting estimate. As residential mortgage loan servicing rights generally do not trade in an active market, the Company utilizes a model to estimate fair value which considers the present value of expected future cash flows associated with servicing rights using assumptions that market participants would consider in estimating future servicing income and expenses. Such assumptions include prepayment speeds, servicing costs, loan default rates and an appropriate discount rate representing an OAS over market implied forward SOFR. Significant assumptions and the resulting fair values are subject to independent review and challenge by the Company's Treasury Product Control Department through comparisons to available data including recent market activity, independent third-party valuations and industry trade information and surveys. The results of such independent review and challenge are reported to the Company's Executive ALCO Committee. Further information on the fair value of residential mortgage loan servicing right assets and the sensitivity of such value to changes in assumptions is included in note 13 of Notes to Financial Statements.