Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submittedpursuant to Rule405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).Yes☐No☒ Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practical date.Common Stock, $2.50 Par Value -38,330,330shares as of April30, 2025 PARTI. FINANCIAL INFORMATION Item1.Condensed Consolidated Financial StatementsConsolidated Balance SheetsCondensed Consolidated Statements of Comprehensive IncomeConsolidated Statements of Changes in Shareholders' Equity PARTII. OTHER INFORMATION Item1.Legal ProceedingsItem1A.Risk Factors Table of Contents Table of Contents S&T BANCORP, INC. AND SUBSIDIARIESCONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY(Unaudited) Table of Contents S&T BANCORP, INC. AND SUBSIDIARIESNOTES TO CONSOLIDATED FINANCIAL STATEMENTS NOTE 1.BASIS OF PRESENTATION Principles of Consolidation The interim Condensed Consolidated Financial Statements include the accounts of S&T Bancorp, Inc., or S&T, and its whollyowned subsidiaries. All significant intercompany transactions have been eliminated in consolidation. Investments of 20 percent to 50 Basis of Presentation The accompanying unaudited interim Condensed Consolidated Financial Statements of S&T have been prepared in accordancewith generally accepted accounting principles, or GAAP, in the United States for interim financial information and with theinstructions to Form10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotesrequired by GAAP for complete financial statements and should be read in conjunction with the audited Consolidated FinancialStatements included in our Annual Report on Form10-K for the year ended December31, 2024, or 2024 Form 10-K, filed with the Reclassification Amounts in prior period financial statements and footnotes are reclassified whenever necessary to conform to the current periodpresentation. Reclassifications had no effect on our consolidated financial statements. Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions thataffect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial Segments We have one operating segment, Community Banking, based upon our current reporting structure at the consolidated level. Thechief operating decision maker, or CODM, uses consolidated net income when allocating resources and making operating decisions.The accounting policies used to measure the profit and loss of the Community Banking segment are the same as those described in the Recently Adopted Accounting Standards Updates, or ASU, or Updated Income Taxes (Topic 740) Improvements to Income Tax Disclosures In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures toenhance the transparency and decision usefulness of the disclosures. The amendments in this update address investor requests for moretransparency about income tax information through improvements to disclosures primarily related to the rate reconciliation andincome taxes paid information. The amendments in this update are effective for fiscal years beginning after December 15, 2024. We Table of Contents S&T BANCORP, INC. AND SUBSIDIARIESNOTES TO CONSOLIDATED FINANCIAL STATEMENTS Recently Issued Accounting Standards Not Yet Adopted Income Statement (Subtopic 220-40)—Reporting Comprehensive Income—Expense Disaggregation Disclosures In November 2024, the FASB issued ASU 2024-03, Income Statement (Subtopic 220-40)—Reporting Comprehensive Income—Expense Disaggregation Disclosures to improve the disclosures about a public business entity’s expenses and address requests frominvestors for more detailed information about the types of expenses in commonly presented expense captions. The amendments in thisupdate are effective for annual reporting periods beginning after December 15, 2026, and interim reporting periods beginning after NOTE 2.EARNINGS PER SHARE Diluted earnings per share is calculated using both the two-class and the treasury stock methods with the more dilutive methodused to determine diluted earnings per share. The treasury stock method was used to determine earnings per share for the three monthsended March31, 2025 and the two-class method was used to determine earnings per share for the three months ended March31, 2024. Table of Contents S&T BANCORP, INC. AND SUBSIDIARIESNOTES TO CONSOLIDATED FINANCIAL STATEMENTS NOTE 3.FAIR VALUE MEASUREMENTS We use fair value measurements when recording and disclosing certain financial assets and liabil