Company: STBA
Filing Date: 2025-03-31
Form Type: DEFA14A
Source: 0001193125-25-068257
Chunk: 0

Company: S&T BANCORP INC
Filing Date: 2025-03-31
Form: DEFA14A
Chunk 0
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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION 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 Rule 
 14a-6(e)(2))                                                       |

| ☐ | Definitive Proxy Statement |

| ☒ | Definitive Additional Materials |

| ☐ | Soliciting Material under Rule 14a-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 Rules 
 14a-6(i)(1) and 0-11.                                                          |

|                           |     | Your Vote                                               
 Counts!                                                 
 S&T BANCORP,                                            
 INC..    2025                                           
 Annual Meeting Vote                                     
 by May 12, 2025 11:59 PM ET. For shares held in a Plan, 
 vote by May 8, 2025 11:59 PM ET.                        |
|:--------------------------|:----|:--------------------------------------------------------|
| S&T BANCORP,              
 INC. 800 PHILADELPHIA ST. 
 INDIANA, PA 15701         |     |                                                         |
| V62563-P22827             |     |                                                         |

You invested in S&T BANCORP, INC. and it’s time to vote! You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy materials for the shareholder meeting to be held on May 13, 2025.

Get informed before you vote View S&T’s Proxy Statement for the 2025 Annual Meeting of Shareholders and S&T’s Annual Report on Form 10-K for the fiscal year ended December 31, 2024 online OR you can receive a free paper or email copy of the material(s) by