S&T Bancorp, Inc. Announces Second Quarter 2025 Results

S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank, announced net income of $31.9 million, or $0.83 per diluted share, for the second quarter of 2025 compared to net income of $33.4 million, or $0.87 per diluted share, for the first quarter of 2025 and net income of $34.4 million, or $0.89 per diluted share, for the second quarter of 2024.

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Second Quarter of 2025 Highlights:

— Strong return metrics with return on average assets (ROA) of 1.32%, return on average equity (ROE) of 8.91% and return on average tangible equity (ROTE) (non-GAAP) of 12.12% compared to ROA of 1.41%, ROE of 9.67% and ROTE (non-GAAP) of 13.29% for the first quarter of 2025.

— Pre-provision net revenue to average assets (PPNR) (non-GAAP) was solid at 1.73% for both the second and first quarters of 2025.

— Net interest income growth of $3.3 million, or 3.90%, and net interest margin on a fully taxable equivalent basis (NIM) (FTE) (non-GAAP) expansion of 7 basis points to 3.88% compared to 3.81% in the first quarter of 2025.

— Total portfolio loans increased $98.1 million, or 5.02% annualized, compared to March 31, 2025.

— Total deposits increased $28.0 million, or 1.42% annualized, compared to March 31, 2025.

— Nonperforming assets decreased $1.1 million to $21.3 million, or 0.27% of total loans plus other real estate owned (OREO), compared to $22.4 million, or 0.29%, at March 31, 2025.

“We are pleased to report another strong quarter with excellent returns, driven by continued progress on our performance drivers,” said Chris McComish, chief executive officer. “Net interest income growth was driven by net interest margin expansion and solid loan growth while asset quality metrics remain at very favorable levels. As we move into the second half of the year, we remain confident in our strategy, the strength and commitment of our team and our ability to capitalize on future growth opportunities.”

Net Interest Income Net interest income increased $3.3 million, or 3.90%, to $86.6 million in the second quarter of 2025 compared to $83.3 million in the first quarter of 2025. Average interest-earning assets increased $112.5 million to $9.0 billion in the second quarter of 2025 compared to $8.9 billion in the first quarter of 2025. NIM (FTE) (non-GAAP)expansion of 7 basis points to 3.88% compared to 3.81% in the prior quarter.The yield on average total interest-earning assets increased 6 basis points to 5.76% compared to 5.70% in the first quarter of 2025 primarily due to favorable asset repricing. Total interest-bearing liability costs decreased 3 basis points to 2.84% compared to 2.87% in the first quarter of 2025 mainly due to the repricing of certificates of deposits.

Asset Quality Asset quality remained strong in the second quarter of 2025. The allowance for credit losses, or ACL, was $98.6 million, or 1.24% of total portfolio loans at June30, 2025 compared to $99.0 million, or 1.26%, at March31, 2025. The provision for credit losses was$2.0 million for the second quarter of 2025 compared to a negative $3.0 million in the first quarter of 2025. The negative provision in the first quarter of 2025 related to net recoveries and a $4.2 million decrease in specific reserves. Net charge-offs were $1.2 million, or 0.06% of average loans, compared to net recoveries in the first quarter of 2025. Nonperforming assets decreased $1.1 million to $21.3 million, or 0.27% of total loans plus OREO, compared to $22.4 million, or 0.29%, at March31, 2025.

Noninterest Income and Expense Noninterest income increased $3.1 million to $13.5 million in the second quarter of 2025 compared to $10.4 million in the first quarter of 2025. The increase primarily related to a $2.3 million realized loss recognized in the first quarter of 2025 from the repositioning of securities into longer duration, higher-yielding securities. Additionally, debit and credit card fees and service charges on deposit accounts were seasonally higher compared to the first quarter of 2025. Total noninterest expense increased $3.0 million to $58.1 million compared to $55.1 million in the first quarter of 2025. Salaries and employee benefits increased $3.1 million primarily related to annual merit increases, higher incentives and medical costs compared to the first quarter of 2025.

Financial Condition Total assetswere $9.8 billion at June30, 2025 compared to $9.7 billion at March31, 2025. Total portfolio loans increased $98.1 million, or 5.02% annualized, compared to March31, 2025. The commercial loan portfolioincreased $67.3 million with growth in commercial real estate of $58.0 million and commercial construction of $17.7 million partially offset by a decrease in commercial and industrial of $8.4 million compared to March31, 2025. The consumer loan portfolio increased $30.8 million compared to March31, 2025. Total deposits increased $28.0 million, or 1.42% annualized, compared to March31, 2025. Noninterest-bearing demand increased $17.9 million, money market $26.2 million and CDs $62.1 million, offset by decreases in interest-bearing demand deposits of $71.5 million and savings of $6.7 million compared to March31, 2025. Total borrowings increased $55.0 million to $250.3 million compared to $195.3 million at March31, 2025 to fund loan growth.

S&T continues to maintain a strong regulatory capital position with all capital ratios above the well-capitalized thresholds of federal bank regulatory agencies.

Conference Call S&T will host its second quarter 2025 earnings conference call live via webcast at 1:00 p.m. ET on Thursday, July24, 2025. To access the webcast, go to S&T Bancorp Inc.'s Investor Relations webpagestbancorp.com. After the live presentation, the webcast will be archived atstbancorp.comfor 12 months.

About S&T Bancorp, Inc. and S&T Bank S&T Bancorp, Inc. is a $9.8 billion bank holding company that is headquartered in Indiana, Pennsylvania and trades on the NASDAQ Global Select Market under the symbol STBA. Its principal subsidiary, S&T Bank, was established in 1902 and operates in Pennsylvania and Ohio. For more information, visit stbancorp.comor stbank.com. Follow us on Facebook,Instagramand LinkedIn.

Forward-Looking Statements This information contains or incorporates statements that we believe are “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements generally relate to our financial condition, results of operations, plans, objectives, outlook for earnings, revenues, expenses, capital and liquidity levels and ratios, asset levels, asset quality, financial position and other matters regarding or affecting S&T and its future business and operations. Forward-looking statements are typically identified by words or phrases such as “will likely result,” “expect,” “anticipate,” “estimate,” “forecast,” “project,” “intend,” “believe,” “assume,” “strategy,” “trend,” “plan,” “outlook,” “outcome,” “continue,” “remain,” “potential,” “opportunity,” “comfortable,” “current,” “position,” “maintain,” “sustain,” “seek,” “achieve” and variations of such words and similar expressions, or future or conditional verbs such as “will,” “would,” “should,” “could” or “may.” Although we believe the assumptions upon which these forward-looking statements are based are reasonable, any of these assumptions could prove to be inaccurate and the forward-looking statements based on these assumptions could be incorrect. The matters discussed in these forward-looking statements are subject to various risks, uncertainties and other factors that could cause actual results and trends to differ materially from those made, projected or implied in or by the forward-looking statements depending on a variety of uncertainties or other factors including, but not limited to: credit losses and the credit risk of our commercial and consumer loan products; changes in the level of charge-offs and changes in estimates of the adequacy of the allowance for credit losses, or ACL; cybersecurity concerns; rapid technological developments and changes; operational risks or risk management failures by us or critical third parties, including fraud risk; our ability to manage our reputational risks; sensitivity to the interest rate environment, a rapid increase in interest rates or a change in the shape of the yield curve; a change in spreads on interest-earning assets and interest-bearing liabilities; regulatory supervision and oversight, including changes in regulatory capital requirements and our ability to address those requirements; unanticipated changes in our liquidity position; unanticipated changes in regulatory and governmental policies impacting interest rates and financial markets; changes in accounting policies, practices or guidance; legislation affecting the financial services industry as a whole, and S&T, in particular; developments affecting the industry and the soundness of financial institutions and further disruption to the economy and U.S. banking system; the outcome of pending and future litigation and governmental proceedings; increasing price and product/service competition; the ability to continue to introduce competitive new products and services on a timely, cost-effective basis; managing our internal growth and acquisitions; the possibility that the anticipated benefits from acquisitions cannot be fully realized in a timely manner or at all, or that integrating the acquired operations will be more difficult, disruptive or costly than anticipated; containing costs and expenses; reliance on significant customer relationships; an interruption or cessation of an important service by a third-party provider; our ability to attract and retain talented executives and other employees; general economic or business conditions, including the strength of regional economic conditions in our market area; ESG practices and disclosures, including climate change, hiring practices, the diversity of the work force and racial and social justice issues; deterioration of the housing market and reduced demand for mortgages; deterioration in the overall macroeconomic conditions or the state of the banking industry that could warrant further analysis of the carrying value of goodwill and could result in an adjustment to its carrying value resulting in a non-cash charge to net income; the stability of our core deposit base and access to contingency funding; re-emergence of turbulence in significant portions of the global financial and real estate markets that could impact our performance, both directly, by affecting our revenues and the value of our assets and liabilities, and indirectly, by affecting the economy generally and access to capital in the amounts, at the times and on the terms required to support our future businesses and geopolitical tensions and conflicts between nations.

Many of these factors, as well as other factors, are described in our Annual Report on Form 10-K for the year ended December 31, 2024, including Part I, Item 1A-“Risk Factors” and any of our subsequent filings with the SEC. Forward-looking statements are based on beliefs and assumptions using information available at the time the statements are made. We caution you not to unduly rely on forward-looking statements because the assumptions, beliefs, expectations and projections about future events may, and often do, differ materially from actual results. Any forward-looking statement speaks only as to the date on which it is made, and we undertake no obligation to update any forward-looking statement to reflect developments occurring after the statement is made.

Non-GAAP Financial Measures In addition to traditional measures presented in accordance with GAAP, our management uses, and this information contains or references, certain non-GAAP financial measures, such as tangible book value, return on average tangible shareholder's equity, PPNR to average assets, efficiency ratio, tangible common equity to tangible assets and net interest margin on an FTE basis. We believe these non-GAAP financial measures provide information useful to investors in understanding our underlying operational performance and our business and performance trends as they facilitate comparisons with the performance of other companies in the financial services industry. Although we believe that these non-GAAP financial measures enhance investors' understanding of our business and performance, these non-GAAP financial measures should not be considered alternatives to GAAP or considered to be more important than financial results determined in accordance with GAAP, nor are they necessarily comparable with non-GAAP measures which may be presented by other companies. See Definitions and Reconciliation of GAAP to Non-GAAP Financial Measures for more information related to these financial measures.

S&T Bancorp, Inc.Consolidated Selected Financial DataUnaudited 2025 2025 2024 Second First Second(dollars in thousands, except per share data) Quarter Quarter QuarterINTEREST AND DIVIDEND INCOMELoans, including fees $117,696 $114,340 $119,564Investment Securities:Taxable 10,846 10,073 8,761Tax-exempt 35 157 168Dividends 329 278 272Total Interest and Dividend Income 128,906 124,848 128,765INTEREST EXPENSEDeposits 39,056 38,354 39,629Borrowings, junior subordinated debt securities and other 3,278 3,171 5,542Total Interest Expense 42,334 41,525 45,171NET INTEREST INCOME 86,572 83,323 83,594Provision for credit losses 1,974 (3,040) 422Net Interest Income After Provision for Credit Losses 84,598 86,363 83,172NONINTEREST INCOMELoss on sale of securities – (2,295) (3,150)Debit and credit card 4,588 4,188 4,713Service charges on deposit accounts 4,090 3,962 4,089Wealth management 3,042 3,084 2,995Other 1,780 1,490 4,658Total Noninterest Income 13,500 10,429 13,305NONINTEREST EXPENSESalaries and employee benefits 32,907 29,853 30,388Data processing and information technology 4,847 4,930 4,215Occupancy 4,024 4,302 3,649Furniture, equipment and software 3,352 3,483 3,382Other taxes 2,088 1,494 1,433Professional services and legal 1,739 1,286 1,403Marketing 1,490 1,615 1,404FDIC insurance 1,062 1,040 1,053Other noninterest expense 6,605 7,088 6,681Total Noninterest Expense 58,114 55,091 53,608Income Before Taxes 39,984 41,701 42,869Income tax expense 8,084 8,300 8,498Net Income $31,900 $33,401 $34,371Per Share DataShares outstanding at end of period 38,345,448 38,261,299 38,256,204Average shares outstanding – diluted 38,637,400 38,599,656 38,531,692Diluted earnings per share $0.83 $0.87 $0.89Dividends declared per share $0.34 $0.34 $0.33Dividend yield (annualized) 3.60% 3.67% 3.95%Dividends paid to net income 41.30% 38.97% 36.97%Book value $37.70 $37.06 $34.54Tangible book value (1) $27.90 $27.24 $24.71Market value $37.82 $37.05 $33.39Profitability Ratios (Annualized)Return on average assets 1.32% 1.41% 1.45%Return on average shareholders' equity 8.91% 9.67% 10.61%Return on average tangible shareholders' equity(2) 12.12% 13.29% 15.01%Pre-provision net revenue / average assets(3) 1.73% 1.73% 1.82%Efficiency ratio (FTE)(4) 57.73% 56.99% 54.94%

S&T Bancorp, Inc.Consolidated Selected Financial DataUnaudited Six Months Ended June 30,(dollars in thousands, except per share data) 2025 2024INTEREST AND DIVIDEND INCOMELoans, including fees $232,036 $238,141Investment Securities:Taxable 20,919 17,356Tax-exempt 192 361Dividends 607 661Total Interest and Dividend Income 253,754 256,519INTEREST EXPENSEDeposits 77,410 76,291Borrowings, junior subordinated debt securities and other 6,449 13,157Total Interest Expense 83,859 89,448NET INTEREST INCOME 169,895 167,071Provision for credit losses (1,066) 3,049Net Interest Income After Provision for Credit Losses 170,961 164,022NONINTEREST INCOMELoss on sale of securities (2,295) (3,147)Debit and credit card 8,776 8,948Service charges on deposit accounts 8,052 7,917Wealth management 6,126 6,037Other 3,270 6,380Total Noninterest Income 23,929 26,135NONINTEREST EXPENSESalaries and employee benefits 62,760 59,900Data processing and information technology 9,777 9,169Occupancy 8,326 7,519Furniture, equipment and software 6,835 6,854Other Taxes 3,582 3,304Marketing 3,105 3,347Professional services and legal 3,025 3,123FDIC insurance 2,102 2,102Other noninterest expense 13,693 12,810Total Noninterest Expense 113,205 108,128Income Before Taxes 81,685 82,029Income tax expense 16,384 16,419Net Income $65,301 $65,610Per Share DataAverage shares outstanding – diluted 38,618,741 38,495,622Diluted earnings per share $1.69 $1.70Dividends declared per share $0.68 $0.66Dividends paid to net income 40.11% 38.60%Profitability Ratios (annualized)Return on average assets 1.36% 1.38%Return on average shareholders' equity 9.28% 10.17%Return on average tangible shareholders' equity(5) 12.69% 14.44%Pre-provision net revenue / average assets(6) 1.73% 1.79%Efficiency ratio (FTE)(7) 57.37% 55.57%

S&T Bancorp, Inc.Consolidated Selected Financial DataUnaudited 2025 2025 2024 Second First Second(dollars in thousands) Quarter Quarter QuarterASSETSCash and due from banks $203,118 $211,836 $246,310Securities available for sale, at fair value 1,021,183 1,011,111 977,958Loans held for sale – – 188Commercial loans:Commercial real estate 3,520,294 3,462,246 3,347,699Commercial and industrial 1,512,027 1,520,475 1,611,183Commercial construction 397,785 380,129 380,128Total Commercial Loans 5,430,106 5,362,850 5,339,010Consumer loans:Residential mortgage 1,678,992 1,670,750 1,562,026Home equity 681,143 660,594 642,225Installment and other consumer 100,177 98,165 102,660Consumer construction 44,016 43,990 67,649Total Consumer Loans 2,504,328 2,473,499 2,374,560Total Portfolio Loans 7,934,434 7,836,349 7,713,570Allowance for credit losses (98,580) (99,010) (106,150)Total Portfolio Loans, Net 7,835,854 7,737,339 7,607,420Federal Home Loan Bank and other restricted stock, at cost 15,817 13,445 12,056Goodwill 373,424 373,424 373,424Other Intangible assets, net 2,656 2,813 3,456Other assets 358,017 368,308 414,650Total Assets $9,810,069 $9,718,276 $9,635,462LIABILITIESDeposits:Noninterest-bearing demand $2,182,346 $2,164,491 $2,206,589Interest-bearing demand 738,251 809,722 789,317Money market 2,236,298 2,210,081 2,008,486Savings 879,254 886,007 906,794Certificates of deposit 1,884,771 1,822,632 1,769,150Total Deposits 7,920,920 7,892,933 7,680,336Borrowings:Short-term borrowings 150,000 95,000 275,000Long-term borrowings 50,856 50,876 39,034Junior subordinated debt securities 49,448 49,433 49,388Total Borrowings 250,304 195,309 363,422Other liabilities 193,352 212,000 270,261Total Liabilities 8,364,576 8,300,242 8,314,019SHAREHOLDERS' EQUITYTotal Shareholders' Equity 1,445,493 1,418,034 1,321,443Total Liabilities and Shareholders' Equity $9,810,069 $9,718,276 $9,635,462Capitalization RatiosShareholders' equity / assets 14.73% 14.59% 13.71%Tangible common equity / tangible assets(9) 11.34% 11.16% 10.21%Tier 1 leverage ratio 12.18% 12.09% 11.51%Common equity tier 1 capital 14.59% 14.67% 13.89%Risk-based capital – tier 1 14.91% 14.99% 14.21%Risk-based capital – total 16.48% 16.57% 15.79%

S&T Bancorp, Inc.Consolidated Selected Financial DataUnaudited 2025 2025 2024 Second First Second(dollars in thousands) Quarter Quarter QuarterNet Interest Margin (FTE) (QTD Averages)ASSETSInterest-bearing deposits with banks $120,156 4.46% $128,739 4.46% $143,521 5.47%Securities, at fair value 1,011,629 3.79% 990,414 3.59% 961,552 2.93%Loans held for sale – 0.00% – 0.00% 27 7.37%Commercial real estate 3,477,321 5.88% 3,395,599 5.82% 3,346,725 5.97%Commercial and industrial 1,519,133 6.71% 1,535,235 6.69% 1,606,173 7.38%Commercial construction 382,363 6.94% 374,881 6.95% 374,856 7.82%Total Commercial Loans 5,378,817 6.19% 5,305,715 6.15% 5,327,754 6.52%Residential mortgage 1,674,231 5.26% 1,660,177 5.21% 1,528,200 5.00%Home equity 670,066 6.37% 653,113 6.30% 644,545 7.01%Installment and other consumer 99,550 7.88% 99,402 7.97% 105,313 8.63%Consumer construction 41,025 6.82% 45,157 6.86% 72,899 5.97%Total Consumer Loans 2,484,872 5.69% 2,457,849 5.64% 2,350,957 5.75%Total Portfolio Loans 7,863,689 6.03% 7,763,564 5.99% 7,678,711 6.29%Total Loans 7,863,689 6.03% 7,763,564 5.99% 7,678,738 6.29%Total other earning assets 16,537 7.70% 16,768 6.74% 20,087 7.04%Total Interest-earning Assets 9,012,011 5.76% 8,899,485 5.70% 8,803,898 5.91%Noninterest-earning assets 712,891 727,176 756,552Total Assets $9,724,902 $9,626,661 $9,560,450LIABILITIES AND SHAREHOLDERS' EQUITYInterest-bearing demand $763,687 1.01% $779,309 1.00% $822,671 1.13%Money market 2,188,771 3.04% 2,088,346 2.97% 1,938,963 3.25%Savings 880,448 0.69% 884,636 0.66% 915,768 0.70%Certificates of deposit 1,872,329 4.07% 1,860,840 4.29% 1,774,037 4.55%Total Interest-bearing Deposits 5,705,235 2.75% 5,613,131 2.77% 5,451,439 2.92%Short-term borrowings 135,659 4.63% 117,722 4.63% 261,923 5.09%Long-term borrowings 50,866 3.80% 50,886 3.80% 39,099 4.53%Junior subordinated debt securities 49,439 7.12% 49,423 7.17% 49,379 8.18%Total Borrowings 235,964 4.97% 218,031 5.01% 350,401 5.46%Total Other Interest-bearing Liabilities 32,202 4.39% 43,926 4.40% 57,734 5.42%Total Interest-bearing Liabilities 5,973,401 2.84% 5,875,088 2.87% 5,859,574 3.10%Noninterest-bearing liabilities 2,315,213 2,350,574 2,397,606Shareholders' equity 1,436,288 1,400,999 1,303,270Total Liabilities and Shareholders' Equity $9,724,902 $9,626,661 $9,560,450Net Interest Margin(10) 3.88% 3.81% 3.85%

S&T Bancorp, Inc.Consolidated Selected Financial DataUnaudited Six Months Ended June 30,(dollars in thousands) 2025 2024Net Interest Margin (FTE) (YTD Averages)ASSETSInterest-bearing deposits with banks $124,423 4.46% $144,079 5.61%Securities, at fair value 1,001,080 3.69% 964,128 2.87%Loans held for sale – -% 101 7.16%Commercial real estate 3,436,686 5.85% 3,355,933 5.95%Commercial and industrial 1,527,139 6.70% 1,616,403 7.37%Commercial construction 378,643 6.94% 369,972 7.76%Total Commercial Loans 5,342,468 6.17% 5,342,308 6.50%Residential mortgage 1,667,242 5.23% 1,503,405 4.97%Home equity 661,636 6.34% 646,405 7.00%Installment and other consumer 99,476 7.93% 108,106 8.64%Consumer construction 43,080 6.84% 71,288 5.79%Total Consumer Loans 2,471,434 5.67% 2,329,204 5.73%Total Portfolio Loans 7,813,902 6.01% 7,671,512 6.27%Total Loans 7,813,902 6.01% 7,671,613 6.27%Total other earning assets 16,652 7.21% 22,711 7.08%Total Interest-earning Assets 8,956,057 5.73% 8,802,531 5.89%Noninterest-earning assets 719,996 747,147Total Assets $9,676,053 $9,549,678LIABILITIES AND SHAREHOLDERS' EQUITYInterest-bearing demand $771,455 1.01% $825,883 1.13%Money market 2,138,836 3.01% 1,929,486 3.20%Savings 882,531 0.68% 927,618 0.66%Certificates of deposit 1,866,616 4.18% 1,706,548 4.46%Total Interest-bearing deposits 5,659,438 2.76% 5,389,535 2.85%Short-term borrowings 126,740 4.63% 335,137 5.26%Long-term borrowings 50,876 3.80% 39,160 4.53%Junior subordinated debt securities 49,431 7.15% 49,372 8.20%Total Borrowings 227,047 4.99% 423,669 5.54%Total Other Interest-bearing Liabilities 38,032 4.39% 54,986 5.42%Total Interest-bearing Liabilities 5,924,517 2.85% 5,868,190 3.06%Noninterest-bearing liabilities 2,332,795 2,384,596Shareholders' equity 1,418,741 1,296,892Total Liabilities and Shareholders' Equity $9,676,053 $9,549,678Net Interest Margin(8) 3.84% 3.84%

S&T Bancorp, Inc.Consolidated Selected Financial DataUnaudited 2025 2025 2024 Second First Second(dollars in thousands) Quarter Quarter QuarterNonaccrual LoansCommercial loans: % Loans % Loans % LoansCommercial real estate $3,967 0.11% $3,441 0.10% $15,090 0.45%Commercial and industrial 5,459 0.36% 6,749 0.44% 7,075 0.44%Commercial construction 869 0.22% 1,006 0.26% 4,960 1.30%Total Nonaccrual Commercial Loans 10,295 0.19% 11,196 0.21% 27,125 0.51%Consumer loans:Residential mortgage 7,239 0.43% 6,957 0.42% 4,698 0.30%Home equity 3,593 0.53% 3,968 0.60% 2,804 0.44%Installment and other consumer 185 0.18% 218 0.22% 230 0.22%Total Nonaccrual Consumer Loans 11,017 0.44% 11,143 0.45% 7,732 0.33%Total Nonaccrual Loans $21,312 0.27% $22,339 0.29% $34,857 0.45%

2025 2025 2024 Second First Second(dollars in thousands) Quarter Quarter QuarterLoan Charge-offs (Recoveries)Charge-offs $1,656 $884 $845Recoveries (498) (911) (1,233)Net Loan Charge-offs (Recoveries) $1,158 ($27) ($388)Net Loan Charge-offs (Recoveries)Commercial loans:Commercial real estate ($16) ($146) ($379)Commercial and industrial 331 154 (658)Commercial construction 89 30 -Total Commercial Loan Charge-offs (Recoveries) 404 38 (1,037)Consumer loans:Residential mortgage 13 13 33Home equity 160 19 274Installment and other consumer 581 (97) 342Total Consumer Loan Charge-offs (Recoveries) 754 (65) 649Total Net Loan Charge-offs (Recoveries) $1,158 ($27) ($388)

S&T Bancorp, Inc.Consolidated Selected Financial DataUnaudited Six Months Ended June 30,(dollars in thousands) 2025 2024Loan Charge-offs (Recoveries)Charge-offs $2,540 $7,784Recoveries (1,409) (1,583)Net Loan Charge-offs $1,131 $6,201Net Loan Charge-offs (Recoveries)Commercial loans:Commercial real estate ($162) $4,859Commercial and industrial 485 292Commercial construction 119 -Total Commercial Loan Charge-offs 442 5,151Consumer loans:Residential mortgage 26 40Home equity 179 379Installment and other consumer 484 631Total Consumer Loan Charge-offs 689 1,050Total Net Loan Charge-offs $1,131 $6,201

2025 2025 2024 Second First Second(dollars in thousands) Quarter Quarter QuarterAsset Quality DataNonaccrual loans $21,312 $22,339 $34,857OREO – 29 95Total nonperforming assets 21,312 22,368 34,952Nonaccrual loans / total loans 0.27% 0.29% 0.45%Nonperforming assets / total loans plus OREO 0.27% 0.29% 0.45%Allowance for credit losses / total portfolio loans 1.24% 1.26% 1.38%Allowance for credit losses / nonaccrual loans 463% 443% 305%Net loan charge-offs (recoveries) $1,158 ($27) ($388)Net loan charge-offs (recoveries) (annualized) / average loans 0.06% (0.00%) (0.02%) Six Months Ended June 30,(dollars in thousands) 2025 2024Asset Quality DataNet loan charge-offs $1,131 $6,201Net loan charge-offs / average loans 0.03% 0.16%

S&T Bancorp, Inc.Consolidated Selected Financial DataUnauditedDefinitions and Reconciliation of GAAP to Non-GAAP Financial Measures: 2025 2025 2024 Second First Second(dollars in thousands, except per share data) Quarter Quarter Quarter(1)Tangible Book Value (non-GAAP)Total shareholders' equity $1,445,493 $1,418,034 $1,321,443Less: goodwill and other intangible assets, net of deferred tax liability (375,522) (375,646) (376,154)Tangible common equity (non-GAAP) $1,069,971 $1,042,388 $945,289Common shares outstanding 38,345,448 38,261,299 38,256,204Tangible book value (non-GAAP) $27.90 $27.24 $24.71Tangible book value is a preferred industry metric used to measure our company's value and commonly used by investors and analysts.(2)Return on Average Tangible Shareholders' Equity (non-GAAP)Net income (annualized) $127,951 $135,460 $138,239Plus: amortization of intangibles (annualized), net of tax 653 772 921Net income before amortization of intangibles (annualized) $128,604 $136,232 $139,160Average total shareholders' equity $1,436,288 $1,400,999 $1,303,270Less: average goodwill and other intangible assets, net of deferred tax liability (375,572) (375,741) (376,285)Average tangible equity (non-GAAP) $1,060,716 $1,025,258 $926,985Return on average tangible shareholders' equity (non-GAAP) 12.12% 13.29% 15.01%Return on average tangible shareholders' equity is a key profitability metric used by management to measure financial performance.(3)Pre-provision Net Revenue / Average Assets (non-GAAP)Income before taxes $39,984 $41,701 $42,869Plus: net loss on sale of securities – 2,295 3,150Less: gain on Visa Class B-1 exchange – – (3,156)Plus: Provision for credit losses 1,974 (3,040) 422Total $41,958 $40,956 $43,285Total (annualized) (non-GAAP) $168,293 $166,099 $174,091Average assets $9,724,902 $9,626,661 $9,560,450Pre-provision Net Revenue / Average Assets (non-GAAP) 1.73% 1.73% 1.82%Pre-provision net revenue to average assets is income before taxes adjusted to exclude provision for credit losses, losses (gains) on sale of securities and gain on Visa exchange. We believe this to be a preferred industry measurement to help evaluate our ability to fund credit losses or build capital.(4)Efficiency Ratio (non-GAAP)Noninterest expense $58,114 $55,091 $53,608Net interest income per consolidated statements of net income $86,572 $83,323 $83,594Plus: taxable equivalent adjustment 590 617 682Net interest income (FTE) (non-GAAP) 87,162 83,940 84,276Noninterest income 13,500 10,429 13,305Plus: net loss (gain) on sale of securities – 2,295 3,150Less: gain on Visa Class B-1 exchange – – (3,156)Net interest income (FTE) (non-GAAP) plus noninterest income $100,662 $96,664 $97,575Efficiency ratio (non-GAAP) 57.73% 56.99% 54.94%The efficiency ratio is noninterest expense divided by noninterest income plus net interest income, on an FTE basis (non-GAAP), adjusted to exclude losses (gains) on sale of securities and gain on Visa exchange. We believe the FTE basis ensures comparability of net interest income arising from both taxable and tax-exempt sources and is consistent with industry practice.

S&T Bancorp, Inc.Consolidated Selected Financial DataUnaudited Six Months Ended June 30,(dollars in thousands) 2025 2024(5)Return on Average Tangible Shareholders' Equity (non-GAAP)Net income (annualized) $131,684 $131,941Plus: amortization of intangibles (annualized), net of tax 712 932Net income before amortization of intangibles (annualized) $132,396 $132,873Average total shareholders' equity $1,418,741 $1,296,892Less: average goodwill and other intangible assets, net of deferred tax liability (375,656) (376,402)Average tangible equity (non-GAAP) $1,043,085 $920,490Return on average tangible shareholders' equity (non-GAAP) 12.69% 14.44%Return on average tangible shareholders' equity is a key profitability metric used by management to measure financial performance.(6)Pre-provision Net Revenue / Average Assets (non-GAAP)Income before taxes $81,685 $82,029Plus: net losses on sale of securities 2,295 3,147Less: gain on Visa Class B-1 exchange – (3,156)Plus: Provision for credit losses (1,066) 3,049Total $82,914 $85,069Total (annualized) (non-GAAP) $167,202 $171,073Average assets $9,676,053 $9,549,678Pre-provision Net Revenue / Average Assets (non-GAAP) 1.73% 1.79%Pre-provision net revenue to average assets is income before taxes adjusted to exclude provision for credit losses, losses (gains) on sale of securities and gain on Visa exchange. We believe this to be a preferred industry measurement to help evaluate our ability to fund credit losses or build capital.(7)Efficiency Ratio (non-GAAP)Noninterest expense $113,205 $108,128Net interest income per consolidated statements of net income $169,895 $167,071Plus: taxable equivalent adjustment 1,208 1,375Net interest income (FTE) (non-GAAP) 171,103 168,446Noninterest income 23,929 26,135Plus: net losses on sale of securities 2,295 3,147Less: gain on Visa Class B-1 exchange – (3,156)Net interest income (FTE) (non-GAAP) plus noninterest income $197,327 $194,572Efficiency ratio (non-GAAP) 57.37% 55.57%The efficiency ratio is noninterest expense divided by noninterest income plus net interest income, on an FTE basis (non-GAAP), adjusted to exclude losses (gains) on sale of securities and gain on Visa exchange. We believe the FTE basis ensures comparability of net interest income arising from both taxable and tax-exempt sources and is consistent with industry practice.(8)Net Interest Margin Rate (FTE) (non-GAAP)Interest income and dividend income $253,754 $256,519Less: interest expense (83,859) (89,448)Net interest income per consolidated statements of net income 169,895 167,071Plus: taxable equivalent adjustment 1,208 1,375Net interest income (FTE) (non-GAAP) $171,103 $168,446Net interest income (FTE) (annualized) $345,042 $338,743Average interest-earning assets $8,956,057 $8,802,531Net interest margin – (FTE) (non-GAAP) 3.84% 3.84%The interest income on interest-earning assets, net interest income and net interest margin are presented on an FTE basis (non-GAAP). The FTE basis (non-GAAP) adjusts for the tax benefit of income on certain tax-exempt loans and securities and the dividend-received deduction for equity securities using the federal statutory tax rate of 21 percent for each period. We believe this to be the preferred industry measurement of net interest income that provides a relevant comparison between taxable and non-taxable sources of interest income.

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