Company: STBA
Filing Date: 2025-03-31
Form Type: DEF 14A
Source: 0001193125-25-068253
Chunk: 3

Company: S&T BANCORP INC
Filing Date: 2025-03-31
Form: DEF 14A
Chunk 3
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|                                                                                                                                    |     | By Telephone  Call (1-800-690-6903)       |
|                                                                                                                                    |     | By Internet  Visit www.proxyvote.com      |
|                                                                                                                                    |     | By Mail  Sign, date and return proxy card |

To the Shareholders of S&T Bancorp, Inc.: Notice is hereby given that the Annual Meeting of Shareholders of S&T Bancorp, Inc. (“S&T”) will be held on May 13, 2025, at 10:00 a.m. Eastern Time, via virtual online meeting only ( www.virtualshareholdermeeting.com/STBA2025) for considering and voting on the following matters:

| 1. | To elect 11 directors to serve a one-year term until the next annual meeting of shareholders and until their respective successors are elected and qualified; |

| 2. | To ratify the selection of Ernst & Young LLP as S&T’s independent registered public accounting firm for the fiscal year 2025; |

| 3. | To approve, on a non-binding advisory basis, the compensation of S&T’s named executive officers; |

| 4. | To transact such other business as may properly come before the meeting or any adjournment thereof. |

Only shareholders of record at the close of business on February 28, 2025 are entitled to notice of and to vote at such meeting or any adjournment thereof. To participate in the virtual Annual Meeting at www.virtualshareholdermeeting.com/STBA2025 , you need to use the 16-digitcontrol number included on your Notice of Internet Availability of Proxy Materials (“Notice”), on your proxy card or on the instructions that accompanied your proxy materials. We encourage you to allow ample time for online check-in,which will begin at 9:30 a.m. Eastern Time. Please note that there is no in-personannual meeting for you to attend. By Order of the Board of Directors, Rachel L. Smydo Secretary Indiana, Pennsylvania March 31, 2025 IMPORTANT YOUR VOTE IS IMPORTANT, AND WE APPRECIATE YOUR TAKING THE TIME TO VOTE PROMPTLY USING ONE OF THE VOTING METHODS DESCRIBED IN THE PROXY STATEMENT. THE BOARD OF DIRECTORS UNANIMOUSLY RECOMMENDS THAT THE SHAREHOLDERS VOTE FOR THE ELECTION AS DIRECTORS OF ALL OF THE NOMINEES NAMED IN THIS PROXY STATEMENT,