X0508 4/A 2025-04-01 2025-04-03 0000719220 S&T BANCORP INC STBA 0001744487 MCCOMISH CHRISTOPHER J. 800 PHILADELPHIA STREET INDIANA PA 15701 1 1 Chief Executive Officer 0 Common Stock 6492 D Restricted Stock Units Common Stock 12460 12460 D Restricted Stock Units Common Stock 12404 12404 D Restricted Stock Units Common Stock 11603 11603 D Restricted Stock Units 2025-04-01 4 A 0 21335 0 A Common Stock 21335 21335 D Restricted Stock Units 2025-04-01 4 A 0 10402 0 A Common Stock 10402 10402 D 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. Each restricted stock unit represents a contingent right to receive one share of S&T Bancorp, Inc. common stock. 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. 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. 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. The restricted stock units vest in three equal annual installments beginning April 1, 2024. 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. Acquired upon achievement of certain performance criteria pursuant to the performance-based restricted stock units granted April 1, 2022, under the Issuer's 2022 Long Term Incentive Plan. The performance period for the restricted stock units was January 1, 2022, until December 31, 2024, with achievement of the applicable performance criteria subject to determination by the Issuer's Compensation Committee. This determination was obtained on March 25, 2025. The restricted performance units awarded on April 1, 2022 vesting on April 1, 2025. Vested shares will be delivered to the reporting person upon vesting. Filing delay due by April 3, 2025, caused by software unable to attach footnotes to awards. The restricted stock units vest in three equal annual installments beginning April 1, 2026. Vested shares will be delivered to the reporting person upon vesting. /s/ Susan L. Rager-Parr, attorney-in-fact for Christopher J. McComish 2025-04-04