Company: STBA
Filing Date: 2025-03-31
Form Type: DEF 14A
Source: 0001193125-25-068253
Chunk: 85

Company: S&T BANCORP INC
Filing Date: 2025-03-31
Form: DEF 14A
Chunk 85
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 these forward-looking statements.

You should not place undue reliance on any forward-looking statements, which are only as of the date made. Factors or events that could cause our actual results to differ may emerge from time to time, and it is not possible to predict all of them. We assume no obligation to update or revise any forward-looking statements that are made from time to time, either as a result of future developments, new information, or otherwise, except as may be required by law.

See also the reports filed with the SEC, including the discussions under the “Forward-Looking Statements” and “Risk Factors” sections of S&T’s Annual Report on Form 10-Kfor the year ended December 31, 2024, as filed with the SEC and available on its website atsec.gov, as well as at www.stbancorp.comand www.proxyvote.com.

<div align='center'>TRADEMARK INFORMATION</div>

S&T BANK and S&T BANK and Design are registered trademarks of S&T. Other words or symbols in this proxy statement that identify other parties’ goods or services may be trademarks or service marks of those other parties.

<div align='center'>INFORMATION NOT INCORPORATED INTO THIS PROXY STATEMENT</div>

No information contained on or accessible through our websites at www.stbancorp.comorhttps://www.stbank.com/corporateresponsibilityor on Bank Director’s website atwww.bankdirector.comis part or shall be deemed to be a part of this proxy statement by reference or otherwise incorporated into any other filings we make with the SEC, except to the extent we specifically incorporate such information by reference.

S&T Bancorp, Inc.|2025 Proxy Statement| 67

APPENDIX A RECONCILIATIONS OF GAAP TO NON-GAAP In addition to traditional measures presented in accordance with GAAP, S&T’s management uses, and this Proxy Statement contains or references, certain non-GAAPfinancial measures identified below. We believe these non-GAAPfinancial 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-GAAPfinancial measures enhance investors’ understanding of our business and performance, these non-GAAPfinancial measures should not be considered an alternative to GAAP or considered to be more important than financial results determined in accordance with GAAP, nor are they necessarily comparable with non-GAAPmeasures which may be presented by other companies. Return