Sec Form 4 Filing - Lazzari Melanie A @ S&T BANCORP INC - 2024-04-10

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL OMB Number: 3235-0287 Expires: November 30, 2011 Estimated average burden hours per response... 0.5

1. Name and Address of Reporting Person Lazzari Melanie A 2. Issuer Name and Ticker or Trading Symbol S&T BANCORP INC [ STBA] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Executive Vice President (Last) (First) (Middle) 800 PHILADELPHIA STREET 3. Date of Earliest Transaction (MM/DD/YY) 04/10/2024 (Street) INDIANA, PA15701 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 04/10/2024 M( 1 ) 495 A $ 29.48 9,630.098 D Common Stock 04/10/2024 F( 2 ) 217 D $ 29.48 9,413.098 D Common Stock 7,384.0795 I 401(k) Common Stock 9 I Spouse IRA

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirec t (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Restricted Stock Units ( 3 ) ( 4 ) ( 5 ) ( 6 ) Common Stock 1,666 1,666 D Restricted Stock Units ( 4 ) ( 7 ) ( 7 ) Common Stock 532 532 D Restricted Stock Units ( 4 ) ( 8 ) ( 8 ) Common Stock 1,029 1,029 D Restricted Stock Units ( 1 ) 04/10/2024 M( 1 ) 495 ( 9 ) ( 9 ) Common Stock 495 $ 0 1,005 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Lazzari Melanie A 800 PHILADELPHIA STREET INDIANA, PA15701 Executive Vice President Signatures /s/ Susan L. Rager-Parr, attorney-in-fact for Melanie A. Lazzari 04/12/2024 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Upon vest, automatically converts into equal number of shares of common stock. ( 2 )Shares of common stock withheld for payment of tax liability for vested and converted RSU's. ( 3 )Correction to the name of the award. It is not a Director's award, but officer award. All other aspects of the award, including date of award, number of shares, and vesting remain unchanged. ( 4 )Each restricted stock unit represents a contingent right to receive one share of S&T Bancorp, Inc. common stock. ( 5 )The restricted stock units vest in three equal annual installments beginning April 1, 2025. Vested shares will be delivered to the reporting person upon vesting. ( 6 )The restricted stock units vest in three equal annual installments beginning April 1, 2025. In accordance with a pre-established deferral election made by the reporting person, vested shares will be delivered to the reporting person upon separation from service or sooner upon the occurrence of certain events. ( 7 )The restricted stock units vest in three equal annual installments beginning April 1, 2023. Vested shares will be delivered to the reporting person upon vesting. ( 8 )The restricted stock units vest in three equal annual installments beginning April 1, 2024. Vested shares will be delivered to the reporting person upon vesting. ( 9 )On April 10, 2023, the Registrant awarded a special grant to the executive officer that will vest equally over the three successive anniversary dates of the grant date.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.