Company: STBA
Filing Date: 2025-03-31
Form Type: DEF 14A
Source: 0001193125-25-068253
Chunk: 0

Company: S&T BANCORP INC
Filing Date: 2025-03-31
Form: DEF 14A
Chunk 0
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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14AINFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.) Filed by the Registrant ☒Filed by a Party other than the Registrant ☐ Check the appropriate box:

| ☐ | Preliminary Proxy Statement |

| ☐ | Confidential, for Use of the Commission Only (as permitted by Rule14a-6(e)(2)) |

| ☒ | Definitive Proxy Statement |

| ☐ | Definitive Additional Materials |

| ☐ | Soliciting Material under Rule14a-12 |

S&T Bancorp, Inc. (Name of registrant as specified in its charter) (Name of person(s) filing proxy statement, if other than the registrant) Payment of Filing Fee (Check all boxes that apply):

| ☒ | No fee required. |

| ☐ | Fee paid previously with preliminary materials. |

| ☐ | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules14a-6(i)(1)and0-11. |

| To my fellow shareholders:   In 1902, a small Pennsylvania Bank began with a promise to make people its purpose. Over 120 years later, we’re still cultivating relationships firmly rooted in trust as we work together to build Our Shared Future. This strategic framework defines our purpose, values and drivers for profitable growth and creates a roadmap that guides our proactive steps to deliver long-term, sustainable financial performance.   Our results in 2024 were driven through meaningful progress on our key business drivers, including consistent growth in our customer deposit franchise and ongoing improvement in asset quality. This diligent, focused approach has enabled us to grow from a single branch in Indiana, Pennsylvania, to an award-winning franchise that spans from central Ohio to Eastern Pennsylvania with over 70 locations. |

People-Forward Banking Our people are our differentiating characteristic and enduring strength. They live our purpose in a uniquely S&T way and foster a welcoming environment where all team members can work together to better the lives of our employees, customers, and communities. At S&T, five values guide our attitudes and actions:

| • |     | Make people our purpose |

| • |     | Do the right thing |

| • |     | Go above and beyond |

| • |     | Value every voice |

| • |     | Win as one team |

As a people