STBA / S&T Bancorp, Inc. - Документы SEC, Годовой отчет, Доверенное заявление

С&Т Банкорп, Инк.
US ˙ NasdaqGS ˙ US7838591011

Основная статистика
LEI MCXHCL35UUWDZK7NCQ61
CIK 719220
SEC Filings
All companies that sell securities in the United States must register with the Securities and Exchange Commission (SEC) and file reports on a regular basis. These reports include company annual reports (10K, 10Q), news updates (8K), investor presentations (found in 8Ks), insider trades (form 4), ownership reports (13D, and 13G), and reports related to the specific securities sold, such as registration statements and prospectus. This page shows recent SEC filings related to S&T Bancorp, Inc.
SEC Filings (Chronological Order)
На этой странице представлен полный хронологический список документов SEC, за исключением документов о собственности, которые мы предоставляем в других местах.
August 29, 2025 EX-99.1

Christopher J. McComish Chief Executive Officer David Antolik President Mark Kochvar Chief Financial Officer Second Quarter 2025 Forward Looking Statements and Risk Factors This information contains or incorporates statements that we believe are “for

a2q25investorpresentatio Christopher J. McComish Chief Executive Officer David Antolik President Mark Kochvar Chief Financial Officer Second Quarter 2025 Forward Looking Statements and Risk Factors 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 statemen

August 29, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 August 29, 2025 Date of Report (date of earliest event reported) S&T BANCORP, INC (

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 August 29, 2025 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization) (

August 7, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 0-12508 S&T BANCORP I

July 30, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 July 30, 2025 Date of Report (date of earliest event reported) S&T BANCORP, INC. (E

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 July 30, 2025 Date of Report (date of earliest event reported) S&T BANCORP, INC. (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization) (C

July 30, 2025 EX-99.1

S&T Bancorp, Inc. Declares Dividend

INVESTOR CONTACT: Mark Kochvar S&T Bancorp, Inc. Chief Financial Officer 724.465.4826 [email protected] FOR IMMEDIATE RELEASE S&T Bancorp, Inc. Declares Dividend INDIANA, Pa., - July 30, 2025 - The board of directors of S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank, approved a $0.34 per share cash dividend on July 30, 2025. This is an increase of $0.01, or 3.03 per

July 24, 2025 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 July 24, 2025 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization) (Co

July 24, 2025 EX-99.2

Second Quarter 2025 Earnings Supplement Forward Looking Statements and Risk Factors This information contains or incorporates statements that we believe are “forward-looking statements” within the meaning of the Private Securities Litigation Reform A

ex992earningssupplements Second Quarter 2025 Earnings Supplement Forward Looking Statements and Risk Factors 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.

July 24, 2025 EX-99.1

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

INVESTOR CONTACT: Mark Kochvar S&T Bancorp, Inc. Chief Financial Officer 724.465.4826 [email protected] FOR IMMEDIATE RELEASE S&T Bancorp, Inc. Announces Second Quarter 2025 Results INDIANA, Pa., - July 24, 2025 – 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

June 23, 2025 11-K

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 11-K x ANNUAL REPORT PURSUANT TO SECTION 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 ¨ TRANSITION REPORT PURSUANT TO SECTION 15 (d) OF THE SE

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 11-K x ANNUAL REPORT PURSUANT TO SECTION 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 OR ¨ TRANSITION REPORT PURSUANT TO SECTION 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 0-12508 A. Full title of the plan and the address of the pla

May 19, 2025 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 May 13, 2025 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization) (Com

May 15, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 May 13, 2025 Date of Report (date of earliest event reported) S&T BANCORP, INC. (Ex

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 May 13, 2025 Date of Report (date of earliest event reported) S&T BANCORP, INC. (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization) (Co

May 15, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 May 13, 2025 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exa

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 May 13, 2025 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization) (Com

May 8, 2025 EX-10.3

and S&T Bancorp, Inc., S&T Bank and their subsidiaries and affiliated companies.

SEVERANCE AGREEMENT THIS SEVERANCE AGREEMENT ("Agreement") is made and entered into as of the latest date set forth below by and between S&T Bancorp, Inc.

May 8, 2025 EX-10.1

and S&T Bancorp, Inc., S&T Bank and their subsidiaries and affiliat

SEVERANCE AGREEMENT THIS SEVERANCE AGREEMENT ("Agreement") is made and entered into as of the latest date set forth below by and between S&T Bancorp, Inc.

May 8, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 0-12508 S&T BANCORP

May 8, 2025 EX-10.5

Confidentiality, Trade Secrets, Non-Solicitation and Severance Agreement, dated October

S&T BANK - CONFIDENTIALITY, TRADE SECRETS, NON-SOLICITATION AND SEVERANCE AGREEMENT THIS CONFIDENTIALITY, TRADE SECRETS, NON-SOLICITATION AND SEVERANCE AGREEMENT ("Agreement") is made and entered into the latest date set forth below by and between S&T Bancorp, Inc, S&T Bank, and their subsidiaries and affiliated companies (hereinafter referred to collectively as "S&T Bank") and the undersigned employee hereinafter referred to as ("Employee").

May 8, 2025 EX-10.4

and S&T Bancorp, Inc., S&T Bank and their subsidiaries and affiliated companies.

SEVERANCE AGREEMENT THIS SEVERANCE AGREEMENT ("Agreement") is made and entered into as of the latest date set forth below by and between S&T Bancorp, Inc.

May 8, 2025 EX-10.2

and S&T Bancorp, Inc., S&T Bank and their subsidiaries and affiliated companies.

SEVERANCE AGREEMENT THIS SEVERANCE AGREEMENT ("Agreement") is made and entered into as of the latest date set forth below by and between S&T Bancorp, Inc.

May 8, 2025 EX-10.6

Confidentiality, Trade Secrets, Non-Solicitation and Severance Agreement, dated October

S&T BANK - CONFIDENTIALITY, TRADE SECRETS, NON-SOLICITATION AND SEVERANCE AGREEMENT THIS CONFIDENTIALITY, TRADE SECRETS, NON-SOLICITATION AND SEVERANCE AGREEMENT ("Agreement") is made and entered into the latest date set forth below by and between S&T Bancorp, Inc, S&T Bank, and their subsidiaries and affiliated companies (hereinafter referred to collectively as "S&T Bank") and the undersigned employee hereinafter referred to as ("Employee").

May 2, 2025 EX-99.1

Christopher J. McComish Chief Executive Officer Mark Kochvar Chief Financial Officer First Quarter 2025 Forward Looking Statements and Risk Factors This information contains or incorporates statements that we believe are “forward-looking statements”

Christopher J. McComish Chief Executive Officer Mark Kochvar Chief Financial Officer First Quarter 2025 Forward Looking Statements and Risk Factors 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, re

May 2, 2025 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 May 02, 2025 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization) (Com

April 30, 2025 EX-99.1

S&T Bancorp, Inc. Declares Dividend

INVESTOR CONTACT: Mark Kochvar S&T Bancorp, Inc. Chief Financial Officer 724.465.4826 [email protected] FOR IMMEDIATE RELEASE S&T Bancorp, Inc. Declares Dividend INDIANA, Pa., - April 30, 2025 - The board of directors of S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank, approved a $0.34 per share cash dividend on April 30, 2025. This is an increase of $0.01, or 3.03 p

April 30, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 April 30, 2025 Date of Report (date of earliest event reported) S&T BANCORP, INC. (

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 April 30, 2025 Date of Report (date of earliest event reported) S&T BANCORP, INC. (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization) (

April 24, 2025 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 April 24, 2025 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization) (C

April 24, 2025 EX-99.2

First Quarter 2025 Earnings Supplement Forward Looking Statements and Risk Factors This information contains or incorporates statements that we believe are “forward-looking statements” within the meaning of the Private Securities Litigation Reform Ac

earningssupplement-first First Quarter 2025 Earnings Supplement Forward Looking Statements and Risk Factors 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.

April 24, 2025 EX-99.1

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

INVESTOR CONTACT: Mark Kochvar S&T Bancorp, Inc. Chief Financial Officer 724.465.4826 [email protected] FOR IMMEDIATE RELEASE S&T Bancorp, Inc. Announces First Quarter 2025 Results INDIANA, Pa., - April 24, 2025 – S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank, announced net income of $33.4 million, or $0.87 per diluted share, for the first quarter of 2025 compared

March 31, 2025 DEFA14A

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.  )

DEFA14A 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 R

March 31, 2025 DEF 14A

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.   )

Table of Contents 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

March 3, 2025 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 ☐ TRANSITION REPORT PURSUANT TO SECTI

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 0-12508 S&T BANCORP, INC. (Exact nam

March 3, 2025 EX-21

Subsidiaries of the Registrant

Exhibit 21 SUBSIDIARIES OF THE REGISTRANT S&T Bancorp, Inc., a Pennsylvania corporation, is a financial holding company. The table below sets forth all of our subsidiaries, except certain inactive subsidiaries, as to state or jurisdiction of organization. Subsidiary State or Jurisdiction of Organization S&T Bank Pennsylvania 9th Street Holdings, Inc. Delaware S&T Bancholdings, Inc. Delaware S&T In

March 3, 2025 EX-19.1

der Trading Policy

S&T BANCORP, INC., and S&T BANK POLICY #603 - Insider Trading Policy POLICY TYPE: Corporate SECTION: External Affairs and Communications DATE ISSUED/REVISED: 7/24/2024 ISSUING DEPARTMENT: Executive Page 1 of 12 I.INTRODUCTION S&T Bancorp, Inc. (the “Company”) has adopted this Insider Trading Policy (the “Policy”) that prohibits trading based on material, nonpublic information regarding S&T Bancorp

February 11, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 February 11, 2025 Date of Report (date of earliest event reported) S&T BANCORP, INC

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 February 11, 2025 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization)

February 11, 2025 EX-99.1

Christopher J. McComish Chief Executive Officer Mark Kochvar Chief Financial Officer Full Year and Fourth Quarter 2024 Forward Looking Statements and Risk Factors This information contains or incorporates statements that we believe are “forward-looki

Christopher J. McComish Chief Executive Officer Mark Kochvar Chief Financial Officer Full Year and Fourth Quarter 2024 Forward Looking Statements and Risk Factors 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 financia

January 30, 2025 EX-99.4

S&T Bancorp, Inc. Declares Dividend

INVESTOR CONTACT: Mark Kochvar S&T Bancorp, Inc. Chief Financial Officer 724.465.4826 [email protected] FOR IMMEDIATE RELEASE S&T Bancorp, Inc. Declares Dividend INDIANA, Pa., - January 29, 2025 - The board of directors of S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank, approved a $0.34 per share cash dividend on January 29, 2025. This is an increase of $0.01, or 3.

January 30, 2025 EX-99.2

Asset Size $9.7 billion As of 12/31/24 Market Cap $1.5 billion As of 12/31/24 2024 Performance: 2024 Highlights “I’m incredibly proud of our results and all that we achieved in 2024. Our performance was driven through meaningful progress on our key b

Asset Size $9.7 billion As of 12/31/24 Market Cap $1.5 billion As of 12/31/24 2024 Performance: 2024 Highlights “I’m incredibly proud of our results and all that we achieved in 2024. Our performance was driven through meaningful progress on our key business drivers, including consistent growth in our customer deposit franchise and ongoing improvement in asset quality.” – Chris McComish, Chief Exec

January 30, 2025 EX-99.1

S&T Bancorp, Inc. Announces Fourth Quarter and Full Year 2024 Results

INVESTOR CONTACT: Mark Kochvar S&T Bancorp, Inc. Chief Financial Officer 724.465.4826 [email protected] FOR IMMEDIATE RELEASE S&T Bancorp, Inc. Announces Fourth Quarter and Full Year 2024 Results INDIANA, Pa. - January 30, 2025 - S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank, announced fourth quarter and full year 2024 earnings. Net income of $33.1 million, or $0.8

January 30, 2025 EX-99.3

Full Year and Fourth Quarter 2024 Earnings Supplement Forward Looking Statements and Risk Factors This information contains or incorporates statements that we believe are “forward-looking statements” within the meaning of the Private Securities Litig

Full Year and Fourth Quarter 2024 Earnings Supplement Forward Looking Statements and Risk Factors 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.

January 30, 2025 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 January 29, 2025 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization)

December 5, 2024 EX-FILING FEES

Filing Fee Table

Exhibit 107 Calculation of Filing Fee Table Form S-3D (Form Type) S&T BANCORP, INC.

December 5, 2024 S-3D

As filed with the U.S. Securities and Exchange Commission on December 5, 2024

As filed with the U.S. Securities and Exchange Commission on December 5, 2024 Registration Statement No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form S-3 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 S&T BANCORP, INC. (Exact name of registrant as specified in its charter) PENNSYLVANIA 6822 25-1434426 (State or other jurisdiction of incorporation or or

December 4, 2024 EX-3.2

Bylaws of S&T Bancorp, Inc., as amended and restated through December 4, 2024 (Clean Version)

INDEX TO BY-LAWS OF S&T BANCORP, INC. ARTICLE I - MEETINGS OF SHAREHOLDERS Section 101. Place of Meetings Section 102. Annual Meetings Section 103. Special Meetings Section 104. Notice of Meetings. Section 105. Nominations and Other Business Section 106. Conduct of Shareholders' Meetings ARTICLE II - DIRECTORS AND BOARD MEETINGS Section 201. Management by Board of Directors Section 202. Nomination

December 4, 2024 EX-3.1

Amended and Restated Articles of Incorporation of S&T Bancorp, Inc., as amended and restated through December 4, 2024

AMENDED AND RESTATED ARTICLES OF INCORPORATION S&T Bancorp, Inc. (As Amended and Restated through December 4, 2024) 1. The name of the corporation is S&T Bancorp, Inc. 2. The location of the corporation's registered office in the Commonwealth of Pennsylvania is 800 Philadelphia Street, Indiana, Pennsylvania, 15701. 3. The term of the corporation's existence shall be perpetual. 4. The purpose or pu

December 4, 2024 8-K

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 December 4, 2024 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization)

December 4, 2024 EX-3.3

Bylaws of S&T Bancorp, Inc., as amended and restated through December 4, 2024 (Marked Version)

INDEX TO BY-LAWS OF S&T BANCORP, INC. ARTICLE I - MEETINGS OF SHAREHOLDERS Section 101. Place of Meetings Section 102. Annual Meetings Section 103. Special Meetings Section 104. Notice of Meetings. Section 105. Nominations and Other Business Section 106. Conduct of Shareholders' Meetings ARTICLE II - DIRECTORS AND BOARD MEETINGS Section 201. Management by Board of Directors Section 202. Nomination

November 6, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 November 6, 2024 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization)

November 6, 2024 EX-99.1

Christopher J. McComish Chief Executive Officer Mark Kochvar Chief Financial Officer Third Quarter 2024 Forward Looking Statements and Risk Factors This information contains or incorporates statements that we believe are “forward-looking statements”

Christopher J. McComish Chief Executive Officer Mark Kochvar Chief Financial Officer Third Quarter 2024 Forward Looking Statements and Risk Factors 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, re

October 31, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 0-12508 S&T BANC

October 23, 2024 EX-99.1

S&T Bancorp, Inc. Increases Quarterly Cash Dividend

INVESTOR CONTACT: Mark Kochvar S&T Bancorp, Inc. Chief Financial Officer 724.465.4826 [email protected] FOR IMMEDIATE RELEASE S&T Bancorp, Inc. Increases Quarterly Cash Dividend INDIANA, Pa. - October 23, 2024 - The Board of Directors of S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank, approved a $0.34 per share cash dividend on October 23, 2024. This is an increase

October 23, 2024 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 October 23, 2024 Date of Report (date of earliest event reported) S&T BANCORP, INC. (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization)

October 17, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 October 17, 2024 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization)

October 17, 2024 EX-99.2

Third Quarter 2024 Earnings Supplement Forward Looking Statements and Risk Factors This information contains or incorporates statements that we believe are “forward-looking statements” within the meaning of the Private Securities Litigation Reform Ac

Third Quarter 2024 Earnings Supplement Forward Looking Statements and Risk Factors 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.

October 17, 2024 EX-99.1

S&T Bancorp Inc. Announces Third Quarter 2024 Results

INVESTOR CONTACT: Mark Kochvar S&T Bancorp, Inc. Chief Financial Officer 724.465.4826 [email protected] FOR IMMEDIATE RELEASE S&T Bancorp Inc. Announces Third Quarter 2024 Results INDIANA, Pa., - October 17, 2024 – S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank, announced net income of $32.6 million, or $0.85 per diluted share, for the third quarter of 2024 compared

August 30, 2024 EX-99.1

Christopher J. McComish Chief Executive Officer Mark Kochvar Chief Financial Officer Second Quarter 2024 Forward Looking Statements and Risk Factors This information contains or incorporates statements that we believe are “forward-looking statements”

Christopher J. McComish Chief Executive Officer Mark Kochvar Chief Financial Officer Second Quarter 2024 Forward Looking Statements and Risk Factors 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, r

August 30, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 August 30, 2024 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization) (

August 2, 2024 S-3ASR

As filed with the U.S. Securities and Exchange Commission on August 1, 2024

As filed with the U.S. Securities and Exchange Commission on August 1, 2024 Registration Statement No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form S-3 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 S&T BANCORP, INC. (Exact name of registrant as specified in its charter) PENNSYLVANIA 6822 25-1434426 (State or other jurisdiction of incorporation or orga

August 2, 2024 EX-FILING FEES

Filing Fee Table

Exhibit 107 Calculation of Filing Fee Table Form S-3 (Form Type) S&T BANCORP, INC.

August 1, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 0-12508 S&T BANCORP I

July 25, 2024 EX-99.1

S&T Bancorp Welcomes Peter G. Gurt to Board of Directors

INVESTOR CONTACT: Mark Kochvar S&T Bancorp, Inc. Chief Financial Officer 724.465.4826 [email protected] FOR IMMEDIATE RELEASE S&T Bancorp Welcomes Peter G. Gurt to Board of Directors INDIANA, Pa. - July 25, 2024 - S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank, announced today that Peter Gurt will join its board of directors. With over 35 years of experience in acad

July 25, 2024 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 July 24, 2024 Date of Report (date of earliest event reported) S&T BANCORP, INC. (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization) (C

July 24, 2024 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 July 24, 2024 Date of Report (date of earliest event reported) S&T BANCORP, INC. (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization) (C

July 24, 2024 EX-99.1

S&T Bancorp Inc. Declares Dividend

INVESTOR CONTACT: Mark Kochvar S&T Bancorp, Inc. Chief Financial Officer 724.465.4826 [email protected] FOR IMMEDIATE RELEASE S&T Bancorp Inc. Declares Dividend INDIANA, Pa., - July 24, 2024 - The board of directors of S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank, approved a $0.33 per share cash dividend on July 24, 2024. This is an increase of $0.01, or 3.13 perc

July 18, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 July 18, 2024 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization) (Co

July 18, 2024 EX-99.2

Second Quarter 2024 Earnings Supplement Forward Looking Statements and Risk Factors This information contains or incorporates statements that we believe are “forward-looking statements” within the meaning of the Private Securities Litigation Reform A

Second Quarter 2024 Earnings Supplement Forward Looking Statements and Risk Factors 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.

July 18, 2024 EX-99.1

S&T Bancorp Inc. Announces Second Quarter 2024 Results

INVESTOR CONTACT: Mark Kochvar S&T Bancorp, Inc. Chief Financial Officer 724.465.4826 [email protected] FOR IMMEDIATE RELEASE S&T Bancorp Inc. Announces Second Quarter 2024 Results INDIANA, Pa., - July 18, 2024 – S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank, announced net income of $34.4 million, or $0.89 per diluted share, for the second quarter of 2024 compared

June 25, 2024 11-K

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 11-K x ANNUAL REPORT PURSUANT TO SECTION 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 ¨ TRANSITION REPORT PURSUANT TO SECTION 15 (d) OF THE SE

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 11-K x ANNUAL REPORT PURSUANT TO SECTION 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 OR ¨ TRANSITION REPORT PURSUANT TO SECTION 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 0-12508 A. Full title of the plan and the address of the pla

May 16, 2024 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 May 14, 2024 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization) (Com

May 15, 2024 8-K/A

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 January 24, 2024 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization

May 7, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 May 7, 2024 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exac

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 May 7, 2024 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization) (Comm

May 7, 2024 EX-99.1

Christopher J. McComish Chief Executive Officer Mark Kochvar Chief Financial Officer First Quarter 2024 Forward Looking Statements and Risk Factors This information contains or incorporates statements that we believe are “forward-looking statements”

investordeck Christopher J. McComish Chief Executive Officer Mark Kochvar Chief Financial Officer First Quarter 2024 Forward Looking Statements and Risk Factors 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

May 2, 2024 EX-32.0

CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER

Exhibit 32 CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER SARBANES-OXLEY ACT SECTION 906 Pursuant to 18 U.

May 2, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 0-12508 S&T BANCORP

April 24, 2024 EX-99.1

S&T Bancorp Inc. Declares Dividend

INVESTOR CONTACT: Mark Kochvar S&T Bancorp, Inc. Chief Financial Officer 724.465.4826 [email protected] FOR IMMEDIATE RELEASE S&T Bancorp Inc. Declares Dividend INDIANA, Pa., - April 24, 2024 - The board of directors of S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank, approved a $0.33 per share cash dividend on April 24, 2024. This is an increase of $0.01, or 3.13 pe

April 24, 2024 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 April 24, 2024 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization) (C

April 18, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 April 18, 2024 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization) (C

April 18, 2024 EX-99.2

First Quarter 2024 Earnings Supplement Forward Looking Statements and Risk Factors This information contains or incorporates statements that we believe are “forward-looking statements” within the meaning of the Private Securities Litigation Reform Ac

First Quarter 2024 Earnings Supplement Forward Looking Statements and Risk Factors 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.

April 18, 2024 EX-99.1

S&T Bancorp Inc. Announces First Quarter 2024 Results

INVESTOR CONTACT: Mark Kochvar S&T Bancorp, Inc. Chief Financial Officer 724.465.4826 [email protected] FOR IMMEDIATE RELEASE S&T Bancorp Inc. Announces First Quarter 2024 Results INDIANA, Pa., - April 18, 2024 – S&T Bancorp Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank, announced net income of $31.2 million, or $0.81 per diluted share, for the first quarter of 2024 compared to

April 1, 2024 DEFA14A

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.  )

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-

April 1, 2024 DEF 14A

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.   )

Table of Contents 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

February 27, 2024 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 ☐ TRANSITION REPORT PURSUANT TO SECTI

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 0-12508 S&T BANCORP, INC. (Exact nam

February 27, 2024 EX-97.0

as Exhibit 97 to S&T Bancorp, Inc. Annual Report on Form 10-K for year ended December 31, 2023, and incorporated herein by reference

S&T BANCORP, INC. CORPORATE POLICY: #613 – Clawback Policy SECTION: External Affairs and Communications DATE ISSUED/REVISED: 10/24/2023 ISSUING DEPARTMENT: Executive Page 1 of 4 - PURPOSE The S&T Bancorp, Inc. Clawback Policy applies to all Executive Officers (as defined below) of S&T Bancorp, Inc. and its subsidiaries (together the “Company”). This Policy shall be effective as of October 2, 2023,

February 27, 2024 EX-21.0

Subsidiaries of the Registrant

Exhibit 21 SUBSIDIARIES OF THE REGISTRANT S&T Bancorp, Inc., a Pennsylvania corporation, is a financial holding company. The table below sets forth all of our subsidiaries, except certain inactive subsidiaries, as to state or jurisdiction of organization. Subsidiary State or Jurisdiction of Organization S&T Bank Pennsylvania 9th Street Holdings, Inc. Delaware S&T Bancholdings, Inc. Delaware S&T In

February 15, 2024 EX-99.1

Christopher J. McComish Chief Executive Officer Mark Kochvar Chief Financial Officer Full Year and Fourth Quarter 2023 Forward Looking Statements and Risk Factors This information contains or incorporates statements that we believe are “forward-looki

Christopher J. McComish Chief Executive Officer Mark Kochvar Chief Financial Officer Full Year and Fourth Quarter 2023 Forward Looking Statements and Risk Factors 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 financia

February 15, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 February 14, 2024 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization)

February 13, 2024 SC 13G/A

STBA / S&T Bancorp, Inc. / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 13)* Name of issuer: S&T Bancorp Inc Title of Class of Securities: Common Stock CUSIP Number: 783859101 Date of Event Which Requires Filing of this Statement: December 29, 2023 Check the appropriate box to designate the rule pursuant to which this Schedule is filed: ☒ Ru

February 9, 2024 SC 13G/A

STBA / S&T Bancorp, Inc. / DIMENSIONAL FUND ADVISORS LP - SEC SCHEDULE 13G Passive Investment

SC 13G/A 1 SEC13GFiling.htm SEC SCHEDULE 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1 )* S&T Bancorp Inc (Name of Issuer) Common Stock (Title of Class of Securities) 783859101 (CUSIP Number) December 29, 2023 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to des

January 29, 2024 EX-99.1

Christopher J. McComish Chief Executive Officer Mark Kochvar Chief Financial Officer Full Year and Fourth Quarter 2023 Forward Looking Statements and Risk Factors This information contains or incorporates statements that we believe are “forward-looki

Christopher J. McComish Chief Executive Officer Mark Kochvar Chief Financial Officer Full Year and Fourth Quarter 2023 Forward Looking Statements and Risk Factors 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 financia

January 29, 2024 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 January 23, 2024 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization)

January 29, 2024 EX-99.1

S&T Bancorp Announces Retirement of Steven J. Weingarten From Board of Directors

MEDIA CONTACT: Amy Toth S&T Bancorp, Inc. Director of Corporate Communications 724.618.5689 [email protected] FOR IMMEDIATE RELEASE S&T Bancorp Announces Retirement of Steven J. Weingarten From Board of Directors INDIANA, Pa. - January 29, 2024 - S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank, announced today that Steven J. Weingarten, 65, has decided to retire from the

January 29, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 January 29, 2024 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization)

January 25, 2024 EX-99.1

S&T Bancorp, Inc. Announces Fourth Quarter and Full Year 2023 Results

INVESTOR CONTACT: Mark Kochvar S&T Bancorp, Inc. Chief Financial Officer 724.465.4826 [email protected] FOR IMMEDIATE RELEASE S&T Bancorp, Inc. Announces Fourth Quarter and Full Year 2023 Results INDIANA, Pa. - January 25, 2024 - S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank, announced fourth quarter and full year 2023 earnings. Net income of $37.0 million, or $0.9

January 25, 2024 EX-99.4

S&T Bancorp, Inc. Declares Dividend

INVESTOR CONTACT: Mark Kochvar S&T Bancorp, Inc. Chief Financial Officer 724.465.4826 [email protected] FOR IMMEDIATE RELEASE S&T Bancorp, Inc. Declares Dividend INDIANA, Pa. - January 24, 2024 - The Board of Directors of S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank, approved a $0.33 per share cash dividend on January 24, 2024. This is an increase of $0.01, or 3.1

January 25, 2024 EX-99.2

Asset Size $9.6 billion As of 12/31/23 Market Cap $1.3 billion As of 12/31/23 2023 Performance: 2023 Highlights “It was a great year for S&T with record net income and earnings per share for the second year in a row. Our highly engaged teams that go

Asset Size $9.6 billion As of 12/31/23 Market Cap $1.3 billion As of 12/31/23 2023 Performance: 2023 Highlights “It was a great year for S&T with record net income and earnings per share for the second year in a row. Our highly engaged teams that go above and beyond every day to provide an award-winning customer experience are fundamental to our success. For the quarter, I am pleased that we achie

January 25, 2024 EX-99.3

Fourth Quarter 2023 Earnings Supplement Forward Looking Statements and Risk Factors This information contains or incorporates statements that we believe are “forward-looking statements” within the meaning of the Private Securities Litigation Reform A

Fourth Quarter 2023 Earnings Supplement Forward Looking Statements and Risk Factors 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.

January 25, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 January 24, 2024 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization)

January 24, 2024 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 January 24, 2024 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization)

January 24, 2024 EX-99.1

S&T Bancorp Welcomes Bhaskar Ramachandran to its Board of Directors Brings extensive cybersecurity, risk management and emerging technology expertise

MEDIA CONTACT: Amy Toth S&T Bancorp, Inc. Director of Corporate Communications 724.618.5689 [email protected] FOR IMMEDIATE RELEASE S&T Bancorp Welcomes Bhaskar Ramachandran to its Board of Directors Brings extensive cybersecurity, risk management and emerging technology expertise INDIANA, Pa. - January 24, 2024 - S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank, announce

November 22, 2023 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 November 22, 2023 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization)

November 22, 2023 EX-99.1

Christopher J. McComish Chief Executive Officer Mark Kochvar Chief Financial Officer Third Quarter 2023 Forward Looking Statements and Risk Factors This information contains or incorporates statements that we believe are “forward-looking statements”

Christopher J. McComish Chief Executive Officer Mark Kochvar Chief Financial Officer Third Quarter 2023 Forward Looking Statements and Risk Factors 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, re

November 3, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 0-12508 S&T BANC

November 3, 2023 EX-32.0

CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER

Exhibit 32 CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER SARBANES-OXLEY ACT SECTION 906 Pursuant to 18 U.

October 26, 2023 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 October 25, 2023 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization)

October 26, 2023 EX-99.1

S&T Bancorp, Inc. Increases Quarterly Cash Dividend

INVESTOR CONTACT: Mark Kochvar S&T Bancorp, Inc. Chief Financial Officer 724.465.4826 [email protected] FOR IMMEDIATE RELEASE S&T Bancorp, Inc. Increases Quarterly Cash Dividend INDIANA, Pa. - October 25, 2023 - The Board of Directors of S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank, approved a $0.33 per share cash dividend on October 25, 2023. This is an increase

October 19, 2023 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 October 19, 2023 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization)

October 19, 2023 EX-99.2

Third Quarter 2023 Earnings Supplement Forward Looking Statements and Risk Factors This information contains or incorporates statements that we believe are “forward-looking statements” within the meaning of the Private Securities Litigation Reform Ac

Third Quarter 2023 Earnings Supplement Forward Looking Statements and Risk Factors 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.

October 19, 2023 EX-99.1

S&T Bancorp, Inc. Announces Third Quarter 2023 Net Income

INVESTOR CONTACT: Mark Kochvar S&T Bancorp, Inc. Chief Financial Officer 724.465.4826 [email protected] FOR IMMEDIATE RELEASE S&T Bancorp, Inc. Announces Third Quarter 2023 Net Income INDIANA, Pa. - October 19, 2023 - S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank, announced net income of $33.5 million, or $0.87 per diluted share, for the third quarter of 2023 compa

September 11, 2023 EX-99.1

Christopher J. McComish Chief Executive Officer Mark Kochvar Chief Financial Officer Second Quarter 2023 Forward Looking Statements and Risk Factors This information contains or incorporates statements that we believe are “forward-looking statements”

Christopher J. McComish Chief Executive Officer Mark Kochvar Chief Financial Officer Second Quarter 2023 Forward Looking Statements and Risk Factors 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, r

September 11, 2023 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 September 11, 2023 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization

August 3, 2023 EX-32.0

CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER

Exhibit 32 CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER SARBANES-OXLEY ACT SECTION 906 Pursuant to 18 U.

August 3, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 0-12508 S&T BANCORP I

July 26, 2023 EX-99.1

S&T Bancorp, Inc. Declares Dividend

INVESTOR CONTACT: Mark Kochvar S&T Bancorp, Inc. Chief Financial Officer 724.465.4826 [email protected] FOR IMMEDIATE RELEASE S&T Bancorp, Inc. Declares Dividend INDIANA, Pa. - July 26, 2023 - The Board of Directors of S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank, approved a $0.32 per share cash dividend on July 26, 2023. This is an increase of $0.02, or 6.7 perce

July 26, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 July 26, 2023 Date of Report (date of earliest event reported) S&T BANCORP, INC (Ex

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 July 26, 2023 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization) (Co

July 20, 2023 EX-99.1

S&T Bancorp, Inc. Announces Second Quarter 2023 Net Income

INVESTOR CONTACT: Mark Kochvar S&T Bancorp, Inc. Chief Financial Officer 724.465.4826 [email protected] FOR IMMEDIATE RELEASE S&T Bancorp, Inc. Announces Second Quarter 2023 Net Income INDIANA, Pa. - July 20, 2023 - S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank, announced net income of $34.5 million, or $0.89 per diluted share, for the second quarter of 2023 compar

July 20, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 July 20, 2023 Date of Report (date of earliest event reported) S&T BANCORP, INC (Ex

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 July 20, 2023 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization) (Co

July 20, 2023 EX-99.2

Second Quarter 2023 Earnings Supplement Forward Looking Statements and Risk Factors This information contains or incorporates statements that we believe are “forward-looking statements” within the meaning of the Private Securities Litigation Reform A

a2q23earningssupplement Second Quarter 2023 Earnings Supplement Forward Looking Statements and Risk Factors 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.

June 23, 2023 11-K

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 11-K x ANNUAL REPORT PURSUANT TO SECTION 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 ¨ TRANSITION REPORT PURSUANT TO SECTION 15 (d) OF THE SE

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 11-K x ANNUAL REPORT PURSUANT TO SECTION 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 OR ¨ TRANSITION REPORT PURSUANT TO SECTION 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 0-12508 A. Full title of the plan and the address of the pla

June 12, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 June 12, 2023 Date of Report (date of earliest event reported) S&T BANCORP, INC (Ex

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 June 12, 2023 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization) (Co

May 17, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 May 16, 2023 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exa

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 May 16, 2023 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization) (Com

May 16, 2023 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 May 15, 2023 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization) (Com

May 16, 2023 EX-99.1

Christopher J. McComish Chief Executive Officer Mark Kochvar Chief Financial Officer First Quarter 2023 Forward Looking Statements and Risk Factors This information contains or incorporates statements that we believe are “forward-looking statements”

a1q23investordeck Christopher J. McComish Chief Executive Officer Mark Kochvar Chief Financial Officer First Quarter 2023 Forward Looking Statements and Risk Factors 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 finan

May 5, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 0-12508 S&T BANCORP

May 5, 2023 EX-32.0

CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER

Exhibit 32 CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER SARBANES-OXLEY ACT SECTION 906 Pursuant to 18 U.

April 26, 2023 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 April 26, 2023 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization) (C

April 26, 2023 EX-99.1

S&T Bancorp, Inc. Declares Dividend

INVESTOR CONTACT: Mark Kochvar S&T Bancorp, Inc. Chief Financial Officer 724.465.4826 [email protected] FOR IMMEDIATE RELEASE S&T Bancorp, Inc. Declares Dividend INDIANA, Pa. - April 26, 2023 - The Board of Directors of S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank, approved a $0.32 per share cash dividend on April 26, 2023.This is an increase of $0.02, or 6.7 perc

April 20, 2023 EX-99.1

S&T Bancorp, Inc. Announces First Quarter 2023 Net Income

INVESTOR CONTACT: Mark Kochvar S&T Bancorp, Inc. Chief Financial Officer 724.465.4826 [email protected] FOR IMMEDIATE RELEASE S&T Bancorp, Inc. Announces First Quarter 2023 Net Income INDIANA, Pa. - April 20, 2023 - S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank, announced net income of $39.8 million, or $1.02 per diluted share, for the first quarter of 2023 compare

April 20, 2023 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 April 20, 2023 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization) (C

April 20, 2023 EX-99.2

First Quarter 2023 Earnings Supplement Forward Looking Statements and Risk Factors This information contains or incorporates statements that we believe are “forward-looking statements” within the meaning of the Private Securities Litigation Reform Ac

a1q23investordeck First Quarter 2023 Earnings Supplement Forward Looking Statements and Risk Factors 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.

April 3, 2023 DEF 14A

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. )

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 P ro xy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(

April 3, 2023 DEFA14A

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. )

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)

February 24, 2023 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 ☐ TRANSITION REPORT PURSUANT TO SECTI

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 0-12508 S&T BANCORP, INC. (Exact nam

February 24, 2023 EX-21

SUBSIDIARIES OF THE REGISTRANT

Exhibit 21 SUBSIDIARIES OF THE REGISTRANT S&T Bancorp, Inc., a Pennsylvania corporation, is a financial holding company. The table below sets forth all of our subsidiaries, except certain inactive subsidiaries, as to state or jurisdiction of organization. Subsidiary State or Jurisdiction of Organization S&T Bank Pennsylvania 9th Street Holdings, Inc. Delaware S&T Bancholdings, Inc. Delaware S&T In

February 13, 2023 EX-99.1

Christopher J. McComish Chief Executive Officer Mark Kochvar Chief Financial Officer Full Year 2022 Forward Looking Statements and Risk Factors This information contains or incorporates statements that we believe are “forward-looking statements” with

Christopher J. McComish Chief Executive Officer Mark Kochvar Chief Financial Officer Full Year 2022 Forward Looking Statements and Risk Factors 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, result

February 13, 2023 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 February 13, 2023 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization)

February 10, 2023 SC 13G

STBA / S&T Bancorp, Inc. / DIMENSIONAL FUND ADVISORS LP - SEC SCHEDULE 13G Passive Investment

SC 13G 1 SEC13GFiling.htm SEC SCHEDULE 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* S&T Bancorp Inc (Name of Issuer) Common Stock (Title of Class of Securities) 783859101 (CUSIP Number) December 30, 2022 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designa

February 9, 2023 SC 13G/A

STBA / S&T Bancorp, Inc. / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SC 13G/A 1 tv01832-stbancorpinc.htm SCHEDULE 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 12)* Name of issuer: S&T Bancorp Inc. Title of Class of Securities: Common Stock CUSIP Number: 783859101 Date of Event Which Requires Filing of this Statement: December 30, 2022 Check the appropriate box to designate the

January 26, 2023 EX-99.1

S&T Bancorp, Inc. Announces Record Fourth Quarter and Full Year 2022 Results

INVESTOR CONTACT: Mark Kochvar S&T Bancorp, Inc. Chief Financial Officer 724.465.4826 [email protected] FOR IMMEDIATE RELEASE S&T Bancorp, Inc. Announces Record Fourth Quarter and Full Year 2022 Results INDIANA, Pa. - January 26, 2023- S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank, with operations in Pennsylvania and Ohio announced its fourth quarter and full year

January 26, 2023 EX-99.5

S&T BANCORP ANNOUNCES EXTENSION OF SHARE REPURCHASE PLAN

INVESTOR CONTACT: Mark Kochvar S&T Bancorp, Inc. Chief Financial Officer 724.465.4826 [email protected] FOR IMMEDIATE RELEASE S&T BANCORP ANNOUNCES EXTENSION OF SHARE REPURCHASE PLAN INDIANA, Pa. - January 25, 2023 - The Board of Directors of S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank with operations in Pennsylvania and Ohio authorized an extension of its $50 mi

January 26, 2023 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 January 25, 2023 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization)

January 26, 2023 EX-99.3

Fourth Quarter 2022 Earnings Supplement Forward Looking Statements and Risk Factors This information contains or incorporates statements that we believe are “forward-looking statements” within the meaning of the Private Securities Litigation Reform A

Fourth Quarter 2022 Earnings Supplement Forward Looking Statements and Risk Factors 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.

January 26, 2023 EX-99.2

Asset Size $9.1 billion As of 12/31/22 Market Cap $1.3 billion As of 12/31/22 Total Shareholder Return 13% 1 YR J.D. Power Award S&T Bank ranked #1 in overall customer satisfaction in the Pennsylvania region in the 2022 U.S. Retail Banking Satisfacti

Asset Size $9.1 billion As of 12/31/22 Market Cap $1.3 billion As of 12/31/22 Total Shareholder Return 13% 1 YR J.D. Power Award S&T Bank ranked #1 in overall customer satisfaction in the Pennsylvania region in the 2022 U.S. Retail Banking Satisfaction Study by J.D. Power. We ranked #1 in the following areas: account offerings, convenience banking, people, and trust. Top Workplaces in the Greater

January 26, 2023 EX-99.4

S&T Bancorp, Inc. Increases Quarterly Cash Dividend

INVESTOR CONTACT: Mark Kochvar S&T Bancorp, Inc. Chief Financial Officer 724.465.4826 [email protected] FOR IMMEDIATE RELEASE S&T Bancorp, Inc. Increases Quarterly Cash Dividend INDIANA, Pa. - January 25, 2023 - The Board of Directors of S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank, approved a $0.32 per share cash dividend on January 25, 2023.This is an increase o

December 21, 2022 EX-3.1

Amended and Restated By-laws of S&T Bancorp, Inc. Filed as Exhibit 3.1 to S&T Bancorp, Inc. Current Report on Form 8-K filed on December 21, 2022, and incorporated herein by reference.

INDEX TO BY-LAWS OF S&T BANCORP, INC. ARTICLE I - MEETINGS OF SHAREHOLDERS Section 101. Place of Meetings Section 102. Annual Meetings Section 103. Special Meetings Section 104. Notice of Meetings. Section 105. Nominations and Other Business Section 106. Conduct of Shareholders' Meetings ARTICLE II - DIRECTORS AND BOARD MEETINGS Section 201. Management by Board of Directors Section 202. Nomination

December 21, 2022 8-K

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 December 19, 2022 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization)

November 14, 2022 EX-99.1

Christopher J. McComish Chief Executive Officer Mark Kochvar Chief Financial Officer Third Quarter 2022 Forward Looking Statements and Risk Factors This information contains or incorporates statements that we believe are “forward-looking statements”

Christopher J. McComish Chief Executive Officer Mark Kochvar Chief Financial Officer Third Quarter 2022 Forward Looking Statements and Risk Factors 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, re

November 14, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 November 14, 2022 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization)

November 2, 2022 EX-32.0

CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER

Exhibit 32 CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER SARBANES-OXLEY ACT SECTION 906 Pursuant to 18 U.

November 2, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2022 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 0-12508 S&T BANC

October 21, 2022 EX-10.1

S&T Bancorp, Inc. Deferred Compensation Plan. Filed as Exhibit 10.1 to S&T Bancorp, Inc. Current Report on Form 8-K filed on October 21, 2022, and incorporated herein by reference.*

TRANSAMERICA RETIREMENT SOLUTIONS, LLC NONQUALIFIED DEFERRED COMPENSATION PLAN DOCUMENT This Plan is to be used in conjunction with the Transamerica Retirement Solutions, LLC Nonqualified Deferred Compensation Adoption Agreement This Plan is an important legal document.

October 21, 2022 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 October 17, 2022 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization)

October 20, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 October 17, 2022 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization)

October 20, 2022 EX-99.2

Third Quarter 2022 Earnings Supplement Forward Looking Statements and Risk Factors This information contains or incorporates statements that we believe are “forward-looking statements” within the meaning of the Private Securities Litigation Reform Ac

Third Quarter 2022 Earnings Supplement Forward Looking Statements and Risk Factors 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.

October 20, 2022 EX-99.1

S&T Bancorp, Inc. Announces Record Quarterly EPS and Net Income

INVESTOR CONTACT: Mark Kochvar S&T Bancorp, Inc. Chief Financial Officer 724.465.4826 [email protected] FOR IMMEDIATE RELEASE S&T Bancorp, Inc. Announces Record Quarterly EPS and Net Income INDIANA, Pa. - October 20, 2022 - S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank, announced net income of $37.2 million, or $0.95 per diluted share, for the third quarter of 2022

October 20, 2022 EX-99.3

S&T Bancorp, Inc. Increases Quarterly Cash Dividend

INVESTOR CONTACT: Mark Kochvar S&T Bancorp, Inc. Chief Financial Officer 724.465.4826 [email protected] FOR IMMEDIATE RELEASE S&T Bancorp, Inc. Increases Quarterly Cash Dividend INDIANA, Pa. - October 18, 2022 - The Board of Directors of S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank, approved a $0.31 per share cash dividend on October 17, 2022. This is an increase

October 17, 2022 EX-10.1

Severance and General Release Agreement, dated October 12, 2022, by and between Charles Carroll and S&T Bancorp, Inc., S&T Bank and any of their subsidiaries or affiliated businesses. Filed as Exhibit 10.1 to S&T Bancorp, Inc. Current Report on Form 8-K/A filed on October 17, 2022, and incorporated herein by reference.*

S&T BANK SEVERANCE AND GENERAL RELEASE AGREEMENT This Severance and General Release Agreement ("Agreement"), by and between the undersigned individual (hereinafter referred to as ?Employee?, ?you? or ?your?) and S&T Bancorp, Inc.

October 17, 2022 8-K/A

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 September 23, 2022 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organizati

September 29, 2022 EX-10.1

Confidentiality, Trade Secrets, Non-Solicitation and Severance Agreement, dated October 21, 2020, between Mr. Carroll and S&T Bancorp, Inc. S&T Bank, and their subsidiaries and affiliated companies. Filed as Exhibit 10.1 to S&T Bancorp, Inc. Current Report on Form 8-K filed on September 29, 2022, and incorporated herein by reference.*

S&T BANK - CONFIDENTIALITY. TRADE SECRETS, NON-SOLICITATION AND SEVERANCE AGREEMENT THIS CONFIDENTIALITY, TRADE SECRETS, NON-SOLICITATION AND SEVERANCE AGREEMENT ("Agreement") is made and entered into the latest date set forth below by and between S&T Bancorp, Inc, S&T Bank, and their subsidiaries and affiliated companies (hereinafter referred to collectively as "S&T Bank") and the undersigned emp

September 29, 2022 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 September 23, 2022 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization

September 2, 2022 EX-99.1

Christopher J. McComish Chief Executive Officer Mark Kochvar Chief Financial Officer Second Quarter 2022 Forward Looking Statements and Risk Factors This information contains or incorporates statements that we believe are “forward-looking statements”

Christopher J. McComish Chief Executive Officer Mark Kochvar Chief Financial Officer Second Quarter 2022 Forward Looking Statements and Risk Factors 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, r

September 2, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 September 2, 2022 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization)

August 3, 2022 EX-1.2

I, Mark Kochvar, certify that:

Exhibit 31.2 CERTIFICATION I, Mark Kochvar, certify that: 1.I have reviewed this quarterly report on Form 10-Q of S&T Bancorp, Inc.; 2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to t

August 3, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2022 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 0-12508 S&T BANCORP I

August 3, 2022 EX-10.4

Form of Restricted Stock Unit Award Agreement - Directors. Filed as Exhibit 10.4 to S&T Bancorp, Inc. Quarterly Report on Form 10-Q for the quarter ended June 30, 2022 filed on August 3, 2022, and incorporated herein by reference.*

S&T BANCORP, INC. 2021 INCENTIVE PLAN RESTRICTED STOCK UNIT AWARD AGREEMENT 1. Award of Restricted Stock Units. Pursuant to the S&T Bancorp, Inc. 2021 Incentive Plan (the ?Plan?), S&T Bancorp, Inc. (the ?Company?) hereby grants a Restricted Stock Unit Award to the Grantee (the ?Award?). Upon acceptance of this Award, the Grantee shall receive the Share Amount, as set forth below, from the Company?

August 3, 2022 EX-10.3

LTIP. Filed as Exhibit 10.3 to S&T Bancorp, Inc. Quarterly Report on Form 10-Q for the quarter ended June 30, 2022 filed on August 3, 2022, and incorporated herein by reference.*

S&T BANCORP, INC. 2021 INCENTIVE PLAN RESTRICTED STOCK UNIT AWARD AGREEMENT 1. Award of Restricted Stock Units. Pursuant to the S&T Bancorp, Inc. 2021 Incentive Plan (the ?Plan?) and the S&T Bancorp, Inc. 2022 Long-Term Incentive Plan (the ?LTIP?), S&T Bancorp, Inc. (the ?Company?) hereby grants a Restricted Stock Unit Award to the Grantee named below consisting of (a) a ?Time Restricted Stock Uni

August 3, 2022 EX-10.2

LTIP. Filed as Exhibit 10.2 to S&T Bancorp, Inc. Quarterly Report on Form 10-Q for the quarter ended June 30, 2022 filed on August 3, 2022, and incorporated herein by reference.*

S&T BANCORP, INC. 2021 INCENTIVE PLAN RESTRICTED STOCK UNIT AWARD AGREEMENT 1. Award of Restricted Stock Units. Pursuant to the S&T Bancorp, Inc. 2021 Incentive Plan (the ?Plan?), S&T Bancorp, Inc. (the ?Company?) hereby grants a Restricted Stock Unit Award to the Grantee (the ?Award?). Upon acceptance of this Award, the Grantee shall receive the Share Amount, as set forth below, from the Company?

August 3, 2022 EX-32.0

CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER

Exhibit 32 CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER SARBANES-OXLEY ACT SECTION 906 Pursuant to 18 U.

July 28, 2022 8-K

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 July 25, 2022 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization) (Co

July 28, 2022 EX-3.1

i By-Laws as of July 25, 2022 INDEX TO BY-LAWS OF S&T BANCORP, INC. ARTICLE I - MEETINGS OF SHAREHOLDERS Section 101. Place of Meetings Section 102. Annual Meetings Section 103. Special Meetings Section 104. Notice of Meetings. Section 105. Nominatio

i By-Laws as of July 25, 2022 INDEX TO BY-LAWS OF S&T BANCORP, INC. ARTICLE I - MEETINGS OF SHAREHOLDERS Section 101. Place of Meetings Section 102. Annual Meetings Section 103. Special Meetings Section 104. Notice of Meetings. Section 105. Nominations and Other Business Section 106. Conduct of Shareholders' Meetings ARTICLE II - DIRECTORS AND BOARD MEETINGS Section 201. Management by Board of Dir

July 21, 2022 EX-99.2

Second Quarter 2022 Earnings Supplement Forward Looking Statements and Risk Factors This information contains or incorporates statements that we believe are “forward-looking statements” within the meaning of the Private Securities Litigation Reform A

Second Quarter 2022 Earnings Supplement Forward Looking Statements and Risk Factors 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.

July 21, 2022 EX-99.1

S&T Bancorp, Inc. Announces Second Quarter 2022 Net Income

CONTACT: Mark Kochvar Chief Financial Officer 724.465.4826 [email protected] stbancorp.com FOR IMMEDIATE RELEASE S&T Bancorp, Inc. Announces Second Quarter 2022 Net Income Indiana, Pa. - July 21, 2022 - S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank, with operations in five markets including Western Pennsylvania, Eastern Pennsylvania, Northeast Ohio, Central Ohio an

July 21, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 July 18, 2022 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization) (Co

July 21, 2022 EX-99.3

S&T Bancorp, Inc. Declares Dividend

CONTACT: Mark Kochvar Chief Financial Officer 724.465.4826 800 Philadelphia Street Indiana, PA 15701 [email protected] www.stbancorp.com FOR IMMEDIATE RELEASE S&T Bancorp, Inc. Declares Dividend Indiana, Pa. - July 19, 2022 - The Board of Directors of S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank, with operations in five markets including Western Pennsylvania, East

June 28, 2022 11-K

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 11-K x ANNUAL REPORT PURSUANT TO SECTION 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 ¨ TRANSITION REPORT PURSUANT TO SECTION 15 (d) OF THE SE

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 11-K x ANNUAL REPORT PURSUANT TO SECTION 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 OR ? TRANSITION REPORT PURSUANT TO SECTION 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 0-12508 A. Full title of the plan and the address of the pla

June 10, 2022 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 June 7, 2022 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization) (Com

June 10, 2022 EX-10.1

Severance Agreement dated June 7, 2022 by and between George Basara and S&T Bancorp, Inc. Filed as Exhibit 10.1 to S&T Bancorp, Inc. Current Report on Form 8-K filed on June 10, 2022, and incorporated herein by reference.*

May 19, 2022 8-K/A

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 May 16, 2022 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization) (C

May 18, 2022 8-K

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 May 16, 2022 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization) (Com

May 18, 2022 EX-3.1

i By-Laws as of May 16, 2022 INDEX TO BY-LAWS OF S&T BANCORP, INC. ARTICLE I - MEETINGS OF SHAREHOLDERS Section 101. Place of Meetings Section 102. Annual Meetings Section 103. Special Meetings Section 104. Notice of Meetings. Section 105. Nomination

i By-Laws as of May 16, 2022 INDEX TO BY-LAWS OF S&T BANCORP, INC. ARTICLE I - MEETINGS OF SHAREHOLDERS Section 101. Place of Meetings Section 102. Annual Meetings Section 103. Special Meetings Section 104. Notice of Meetings. Section 105. Nominations and Other Business Section 106. Conduct of Shareholders' Meetings ARTICLE II - DIRECTORS AND BOARD MEETINGS Section 201. Management by Board of Dire

May 6, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 May 6, 2022 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization) (Comm

May 6, 2022 EX-99.1

Christopher J. McComish Chief Executive Officer Mark Kochvar Chief Financial Officer First Quarter 2022 Forward Looking Statements and Risk Factors This information contains or incorporates statements that we believe are “forward-looking statements”

Christopher J. McComish Chief Executive Officer Mark Kochvar Chief Financial Officer First Quarter 2022 Forward Looking Statements and Risk Factors 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, re

May 5, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2022 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 0-12508 S&T BANCORP

May 5, 2022 EX-32.0

CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER

Exhibit 32 CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER SARBANES-OXLEY ACT SECTION 906 Pursuant to 18 U.

April 21, 2022 EX-99.3

S&T Bancorp, Inc. Increases Quarterly Cash Dividend

CONTACT: Mark Kochvar Chief Financial Officer 724.465.4826 800 Philadelphia Street Indiana, PA 15701 [email protected] www.stbancorp.com FOR IMMEDIATE RELEASE S&T Bancorp, Inc. Increases Quarterly Cash Dividend Indiana, Pa. -April 19, 2022 - The Board of Directors of S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank, with operations in five markets including Western Pe

April 21, 2022 EX-99.2

First Quarter 2022 Earnings Supplement Forward Looking Statements and Risk Factors This information contains or incorporates statements that we believe are “forward-looking statements” within the meaning of the Private Securities Litigation Reform Ac

First Quarter 2022 Earnings Supplement Forward Looking Statements and Risk Factors 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.

April 21, 2022 EX-99.1

S&T Bancorp, Inc. Announces First Quarter 2022 Net Income

CONTACT: Mark Kochvar Chief Financial Officer 724.465.4826 [email protected] stbancorp.com FOR IMMEDIATE RELEASE S&T Bancorp, Inc. Announces First Quarter 2022 Net Income Indiana, Pa. - April 21, 2022 - S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank, with operations in five markets including Western Pennsylvania, Eastern Pennsylvania, Northeast Ohio, Central Ohio an

April 21, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 April 18,2022 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization) (Co

April 6, 2022 DEFA14A

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. )

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)

April 5, 2022 DEF 14A

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. )

Table of Contents 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 permitte

April 5, 2022 DEFA14A

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. )

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)

March 22, 2022 EX-99.1

S&T BANCORP ANNOUNCES ROBERT E. KANE WILL NOT STAND FOR RE-ELECTION TO THE BOARD OF DIRECTORS

INVESTOR CONTACT Mark Kochvar S&T Bancorp, Inc. Chief Financial Officer 724.465.4826 [email protected] FOR IMMEDIATE RELEASE S&T BANCORP ANNOUNCES ROBERT E. KANE WILL NOT STAND FOR RE-ELECTION TO THE BOARD OF DIRECTORS INDIANA, Pa. ? March 22, 2022 ? S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank with operations in five markets including Western Pennsylvania, Easter

March 22, 2022 EX-99.2

S&T BANCORP ANNOUNCES EXTENSION OF SHARE REPURCHASE PLAN

INVESTOR CONTACT Mark Kochvar S&T Bancorp, Inc. Chief Financial Officer 724.465.4826 [email protected] FOR IMMEDIATE RELEASE S&T BANCORP ANNOUNCES EXTENSION OF SHARE REPURCHASE PLAN INDIANA, Pa. - March 21, 2022 - The Board of Directors of S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank with operations in five markets including Western Pennsylvania, Eastern Pennsylva

March 22, 2022 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 March 21, 2022 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization) (C

February 28, 2022 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 ☐ TRANSITION REPORT PURSUANT TO SECTI

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 0-12508 S&T BANCORP, INC. (Exact nam

February 28, 2022 EX-21.0

SUBSIDIARIES OF THE REGISTRANT

Exhibit 21 SUBSIDIARIES OF THE REGISTRANT S&T Bancorp, Inc., a Pennsylvania corporation, is a financial holding company. The table below sets forth all of our subsidiaries, except certain inactive subsidiaries, as to state or jurisdiction of organization. Subsidiary State or Jurisdiction of Organization S&T Bank Pennsylvania 9th Street Holdings, Inc. Delaware S&T Bancholdings, Inc. Delaware S&T In

February 28, 2022 EX-32.0

CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER

Exhibit 32 CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER SARBANES-OXLEY ACT SECTION 906 Pursuant to 18 U.

February 17, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 February 16, 2022 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization)

February 17, 2022 EX-99.1

Christopher J. McComish Chief Executive Officer Mark Kochvar Chief Financial Officer Full Year 2021 Forward Looking Statements and Risk Factors This information contains or incorporates statements that we believe are “forward-looking statements” with

Christopher J. McComish Chief Executive Officer Mark Kochvar Chief Financial Officer Full Year 2021 Forward Looking Statements and Risk Factors 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, result

February 10, 2022 SC 13G/A

STBA / S&T Bancorp, Inc. / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 11)* Name of issuer: S&T Bancorp Inc. Title of Class of Securities: Common Stock CUSIP Number: 783859101 Date of Event Which Requires Filing of this Statement: December 31, 2021 Check the appropriate box to designate the rule pursuant to which this Schedule is filed: ??R

January 27, 2022 EX-99.1

S&T Bancorp, Inc. Announces Fourth Quarter and Full Year 2021 Results

CONTACT: Mark Kochvar Chief Financial Officer 724.465.4826 800 Philadelphia St. Indiana, PA [email protected] www.stbancorp.com FOR IMMEDIATE RELEASE S&T Bancorp, Inc. Announces Fourth Quarter and Full Year 2021 Results Indiana, Pa. - January 27, 2022 - S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank, with operations in five markets including Western Pennsylvania, Ea

January 27, 2022 EX-99.2

Fourth Quarter 2021 Earnings Supplement Forward Looking Statements and Risk Factors This information contains or incorporates statements that we believe are “forward-looking statements” within the meaning of the Private Securities Litigation Reform A

Fourth Quarter 2021 Earnings Supplement Forward Looking Statements and Risk Factors 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.

January 27, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 January 24, 2022 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization)

January 27, 2022 EX-99.3

S&T Bancorp, Inc. Declares Dividend

CONTACT: Mark Kochvar Chief Financial Officer 724.465.4826 800 Philadelphia Street Indiana, PA 15701 [email protected] www.stbancorp.com FOR IMMEDIATE RELEASE S&T Bancorp, Inc. Declares Dividend Indiana, Pa. - January 25, 2022 - The Board of Directors of S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank, with operations in five markets including Western Pennsylvania, E

November 16, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 November 16, 2021 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization)

November 16, 2021 EX-99.1

Christopher J. McComish Chief Executive Officer David G. Antolik President Mark Kochvar Chief Financial Officer Third Quarter 2021 Forward Looking Statements and Risk Factors This information contains or incorporates statements that we believe are “f

Christopher J. McComish Chief Executive Officer David G. Antolik President Mark Kochvar Chief Financial Officer Third Quarter 2021 Forward Looking Statements and Risk Factors 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

November 4, 2021 EX-32.0

CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER

Exhibit 32 CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER SARBANES-OXLEY ACT SECTION 906 Pursuant to 18 U.

November 4, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2021 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 0-12508 S&T BANC

October 21, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 October 18, 2021 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization)

October 21, 2021 EX-99.2

Third Quarter 2021 Earnings Supplement Forward Looking Statements and Risk Factors This information contains or incorporates statements that we believe are “forward-looking statements” within the meaning of the Private Securities Litigation Reform Ac

Third Quarter 2021 Earnings Supplement Forward Looking Statements and Risk Factors 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.

October 21, 2021 EX-99.3

S&T Bancorp, Inc. Announces Increased Quarterly Dividend

CONTACT: Mark Kochvar Chief Financial Officer 724.465.4826 800 Philadelphia Street Indiana, PA 15701 [email protected] www.stbancorp.com FOR IMMEDIATE RELEASE S&T Bancorp, Inc. Announces Increased Quarterly Dividend Indiana, Pa. -October 19, 2021 - The Board of Directors of S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank, with operations in five markets including Wes

October 21, 2021 EX-99.1

S&T Bancorp, Inc. Announces Third Quarter 2021 Net Income

CONTACT: Mark Kochvar Chief Financial Officer 724.465.4826 [email protected] stbancorp.com FOR IMMEDIATE RELEASE S&T Bancorp, Inc. Announces Third Quarter 2021 Net Income Indiana, Pa. - October 21, 2021 - S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank, with operations in five markets including Western Pennsylvania, Eastern Pennsylvania, Northeast Ohio, Central Ohio

September 7, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 September 7, 2021 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization)

September 7, 2021 EX-99.1

Christopher J. McComish Chief Executive Officer David G. Antolik President Mark Kochvar Chief Financial Officer Second Quarter 2021 Forward Looking Statements and Risk Factors This information contains or incorporates statements that we believe are “

Christopher J. McComish Chief Executive Officer David G. Antolik President Mark Kochvar Chief Financial Officer Second Quarter 2021 Forward Looking Statements and Risk Factors 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

August 5, 2021 EX-24.1

POWER OF ATTORNEY

Exhibit 24.1 POWER OF ATTORNEY KNOW ALL PERSONS BY THESE PRESENTS, that the undersigned directors and officers (each, a ?Signatory?) of S&T Bancorp, Inc., a Pennsylvania corporation, do hereby constitute and appoint Mark Kochvar, Chief Financial Officer, and David G. Antolik, Chief Executive Officer, and each and either of them, our true and lawful attorneys-in-fact and agents, with full power of

August 5, 2021 S-8

As filed with the Securities and Exchange Commission on August 4, 2021

As filed with the Securities and Exchange Commission on August 4, 2021 Registration No.

August 5, 2021 S-3ASR

As filed with the U.S. Securities and Exchange Commission on August 4, 2021

As filed with the U.S. Securities and Exchange Commission on August 4, 2021 Registration Statement No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form S-3 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 S&T BANCORP, INC. (Exact name of registrant as specified in its charter) PENNSYLVANIA 6822 25-1434426 (State or other jurisdiction of incorporation or orga

August 4, 2021 EX-3.1

Exhibit 4.1

AMENDED AND RESTATED ARTICLES OF INCORPORATION S&T Bancorp, Inc. (As Amended and Restated through July 30, 2021) 1. The name of the corporation is S&T Bancorp, Inc. 2. The location of the corporation?s registered office in the Commonwealth of Pennsylvania is 800 Philadelphia Street, Indiana, Pennsylvania, 15701. 3. The term of the corporation?s existence shall be perpetual. 4. The purpose or purpo

August 4, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2021 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 0-12508 S&T BANCORP I

July 22, 2021 EX-99.2

MEMBER FDIC Second Quarter 2021 Earnings Supplement 2 Forward Looking Statements and Risk Factors This information contains or incorporates statements that we believe are “forward-looking statements” within the meaning of the Private Securities Litig

MEMBER FDIC Second Quarter 2021 Earnings Supplement 2 Forward Looking Statements and Risk Factors 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.

July 22, 2021 EX-99.1

S&T Bancorp, Inc. Announces Second Quarter 2021 Net Income

CONTACT: Mark Kochvar Chief Financial Officer 724.465.4826 [email protected] stbancorp.com FOR IMMEDIATE RELEASE S&T Bancorp, Inc. Announces Second Quarter 2021 Net Income Indiana, Pa. - July 22, 2021 - S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank, with operations in five markets including Western Pennsylvania, Eastern Pennsylvania, Northeast Ohio, Central Ohio an

July 22, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 July 19, 2021 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization) (Co

July 22, 2021 EX-99.3

S&T Bancorp, Inc. Declares Dividend

CONTACT: Mark Kochvar Chief Financial Officer 724.465.4826 800 Philadelphia Street Indiana, PA 15701 [email protected] www.stbancorp.com FOR IMMEDIATE RELEASE S&T Bancorp, Inc. Declares Dividend Indiana, Pa. -July 20, 2021 - The Board of Directors of S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank, with operations in five markets including Western Pennsylvania, Easte

July 12, 2021 EX-10.1

Employment Agreement, dated July 12, 2021, by and between S&T Bancorp, Inc. and Christopher J. McComish. Filed as Exhibit 10.1 to S&T Bancorp, Inc. Current Report on Form 8-K filed on

EMPLOYMENT AGREEMENT THIS EMPLOYMENT AGREEMENT (this ?Agreement?) is made and entered into, as of July 12, 2021, by and among S&T Bancorp, Inc.

July 12, 2021 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 July 12, 2021 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization) (Co

July 12, 2021 EX-99.1

S&T BANCORP ANNOUNCES CEO TRANSITION Christopher McComish To Be Appointed CEO

CONTACT: Mark Kochvar Chief Financial Officer 724.465.4826 [email protected] stbancorp.com FOR IMMEDIATE RELEASE S&T BANCORP ANNOUNCES CEO TRANSITION Christopher McComish To Be Appointed CEO Indiana, Pa. ? July 12, 2021 ? S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank with locations in Pennsylvania, Ohio and New York, today announced that Christopher J. McComish has

July 12, 2021 EX-10.2

Employment Agreement, dated July 12, 2021, by and between S&T Bancorp, Inc. and David G. Antolik Filed as Exhibit 10.2 to S&T Bancorp, Inc. Current Report on Form 8-K filed on July 12, 2021, and incorporated herein by reference.*

EMPLOYMENT AGREEMENT THIS EMPLOYMENT AGREEMENT (this ?Agreement?) is made and entered into, as of July 12, 2021, by and among S&T Bancorp, Inc.

June 24, 2021 11-K

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 11-K x ANNUAL REPORT PURSUANT TO SECTION 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2020 ¨ TRANSITION REPORT PURSUANT TO SECTION 15 (d) OF THE SE

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 11-K x ANNUAL REPORT PURSUANT TO SECTION 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2020 OR ? TRANSITION REPORT PURSUANT TO SECTION 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 0-12508 A. Full title of the plan and the address of the pla

June 3, 2021 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 May 31, 2021 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization) (Com

June 3, 2021 EX-10.1

Severance and General Release Agreement, by and between Ernest J. Draganza and S&T Bancorp, Inc. Filed as Exhibit 10.1 to S&T Bancorp, Inc. Current Report on Form 8-K filed on June 3, 2021, and incorporated herein by reference.*

June 2, 2021 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 May 27, 2021 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization) (Com

May 20, 2021 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 May 17, 2021 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization) (Com

May 20, 2021 EX-10.1

S&T Bancorp, Inc. 2021 Incentive Plan. Filed as Exhibit 10.1 to S&T Bancorp, Inc. Current Report on Form 8-K filed on May 20, 2021, and incorporated herein by reference.*

APPENDIX A S&T BANCORP, INC. 2021 INCENTIVE PLAN 1. Definitions. In the Plan, except where the context otherwise indicates, the following definitions shall apply: 1.1 ?Affiliate? means a corporation, partnership, business trust, limited liability company, or other form of business organization at least a majority of the total combined voting power of all classes of stock or other equity interests

May 17, 2021 EX-99.1

MEMBER FDIC 2021 Annual Meeting May 17, 2021 2 Forward Looking Statements and Risk Factors This information contains or incorporates statements that we believe are “forward-looking statements” within the meaning of the Private Securities Litigation R

MEMBER FDIC 2021 Annual Meeting May 17, 2021 2 Forward Looking Statements and Risk Factors 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.

May 17, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 May 17, 2021 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization) (Com

May 6, 2021 EX-10.2

Severance Agreement dated April 20, 2015 by and between George Basara and S&T Bancorp, Inc. Filed as Exhibit 10.2 to S&T Bancorp, Inc. Quarterly Report on Form 10-Q for the quarter ended March 31, 2021, and incorporated herein by reference.*

May 6, 2021 EX-10.1

Confidentiality, Trade Secrets, Non-Solicitation and Severance Agreement, October 21, 2020, by and between George Basara and S&T Bancorp, Inc. Filed as Exhibit 10.1 to S&T Bancorp, Inc. Quarterly Report on Form 10-Q for the quarter ended March 31, 2021, and incorporated herein by reference.*

May 6, 2021 10-Q

Quarterly Report - 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2021 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 0-12508 S&T BANCORP

April 30, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 April 30, 2021 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization) (C

April 30, 2021 EX-99.1

MEMBER FDICMEMBER FDIC Dave Antolik President and Interim Chief Executive Officer Mark Kochvar Chief Financial Officer First Quarter 2021 MEMBER FDIC Forward Looking Statements and Risk Factors This information contains or incorporates statements tha

MEMBER FDICMEMBER FDIC Dave Antolik President and Interim Chief Executive Officer Mark Kochvar Chief Financial Officer First Quarter 2021 MEMBER FDIC Forward Looking Statements and Risk Factors 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.

April 22, 2021 EX-99.3

S&T Bancorp, Inc. Declares Dividend

CONTACT: Mark Kochvar Chief Financial Officer 724.465.4826 800 Philadelphia Street Indiana, PA 15701 [email protected] www.stbancorp.com FOR IMMEDIATE RELEASE S&T Bancorp, Inc. Declares Dividend Indiana, Pa. -April 20, 2021 - The Board of Directors of S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank, with operations in five markets including Western Pennsylvania, East

April 22, 2021 EX-99.2

MEMBER FDIC First Quarter 2021 Earnings Supplement 2 Forward Looking Statements and Risk Factors This information contains or incorporates statements that we believe are “forward-looking statements” within the meaning of the Private Securities Litiga

MEMBER FDIC First Quarter 2021 Earnings Supplement 2 Forward Looking Statements and Risk Factors 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.

April 22, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 April 19, 2021 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization) (C

April 22, 2021 EX-99.1

S&T Bancorp, Inc. Announces Record First Quarter 2021 Net Income

CONTACT: Mark Kochvar Chief Financial Officer 724.465.4826 [email protected] stbancorp.com FOR IMMEDIATE RELEASE S&T Bancorp, Inc. Announces Record First Quarter 2021 Net Income Indiana, Pa. - April 22, 2021 - S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank, with operations in five markets including Western Pennsylvania, Eastern Pennsylvania, Northeast Ohio, Central

April 6, 2021 DEFA14A

- DEFA14A

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. 1) Filed by the Registrant x 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

April 6, 2021 DEF 14A

- DEF 14A

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 x 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)

April 2, 2021 11-K

- 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 11-K x ANNUAL REPORT PURSUANT TO SECTION 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the period ended October 7, 2020 OR ? TRANSITION REPORT PURSUANT TO SECTION 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 0-12508 A. Full title of the plan and the address of

April 2, 2021 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 March 31, 2021 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization) (C

March 17, 2021 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 March 15, 2021 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization) (C

March 17, 2021 EX-99.1

S&T BANCORP ANNOUNCES EXTENSION OF SHARE REPURCHASE PLAN

INVESTOR CONTACT Mark Kochvar S&T Bancorp, Inc. Chief Financial Officer 724.465.4826 [email protected] FOR IMMEDIATE RELEASE S&T BANCORP ANNOUNCES EXTENSION OF SHARE REPURCHASE PLAN INDIANA, Pa. - March 16, 2021 - The Board of Directors of S&T Bancorp, Inc. (S&T) (NASDAQ: STBA), the holding company for S&T Bank with locations in Pennsylvania, Ohio and New York authorized an extension of its

March 1, 2021 10-K

Annual Report - 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-K ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2020 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 0-12508 S&T BANCORP, INC. (Exact nam

March 1, 2021 EX-21

SUBSIDIARIES OF THE REGISTRANT

Exhibit 21 SUBSIDIARIES OF THE REGISTRANT S&T Bancorp, Inc., a Pennsylvania corporation, is a financial holding company. The table below sets forth all of our subsidiaries, except certain inactive subsidiaries, as to state or jurisdiction of organization. Subsidiary State or Jurisdiction of Organization S&T Bank Pennsylvania 9th Street Holdings, Inc. Delaware S&T Bancholdings, Inc. Delaware S&T In

February 10, 2021 SC 13G/A

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 10)*

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 10)* Name of issuer: S&T Bancorp Inc. Title of Class of Securities: Common Stock CUSIP Number: 783859101 Date of Event Which Requires Filing of this Statement: December 31, 2020 Check the appropriate box to designate the rule pursuant to which this Schedule is filed: ☒ R

February 9, 2021 8-K

Regulation FD Disclosure, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 February 9, 2021 Date of Report (date of earliest event reported) S&T BANCORP, INC (Exact name of registrant as specified in its charter) Pennsylvania 0-12508 25-1434426 (State or other jurisdiction of incorporation or organization)

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