Investor Presentaiton

NON-GAAP RECONCILIATION Dollars in thousands, except per share data Calculation of efficiency ratio: Non-interest expense Non-interest income Net interest income Total revenue Efficiency ratio Calculation of efficiency ratio (fully tax equivalent basis) (non-GAAP): For the year ending December 31, 2020 2019 2021 2022 Nine months ended September 30, 2023 $106,892 $87,508 $107,326 $116,433 $137,622 25,975 28,059 33,434 34,766 24,198 116,198 134,711 159,780 189,659 142,135 142,173 162,770 193,214 224,425 166,333 61.55% 65.94% 60.26% 61.32% 64.26% Non-Interest Expense LESS: Core Deposit Intangible Amortization Adjusted Non-Interest Expense Non-Interest Income $87,508 $107,326 $116,433 $137,622 $106,892 567 206 107 96 65 $86,941 $107,120 $116,326 $137,526 $106,827 25,975 28,059 33,434 34,766 24,198 Net Interest Income 116,198 134,711 159,780 189,659 142,135 LESS: Tax Exempt Investment and Loan Income, net of TEFRA (non-GAAP) ADD: Tax Exempt Investment and Loan Income (non-GAAP) (tax-equivalent) 6,664 5,703 4,973 5,011 4,043 8,946 7,490 6,416 6,509 5,668 Adjusted Net Interest Income (non-GAAP) 118,480 136,498 161,223 191,157 143,760 Adjusted Net Revenue (non-GAAP) (tax-equivalent) 144,455 164,557 194,657 225,923 167,958 Efficiency Ratio (fully tax-equivalent) (non-GAAP) 60.19% 65.10% 59.76% 60.87% 63.60% CNB FINANCIAL CORPORATION 24

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