X0508 4 2025-04-01 0000719220 S&T BANCORP INC STBA 0001157921 KOCHVAR MARK 800 PHILADELPHIA STREET INDIANA PA 15701 1 SR EXEC VICE PRESIDENT & CFO 0 Common Stock 2025-04-01 4 M 0 5405 37.15 A 56115.1671 D Common Stock 2025-04-01 4 F 0 2365 37.15 D 53750.1671 D Common Stock 2025-04-01 4 M 0 1069 37.15 A 54819.1671 D Common Stock 2025-04-01 4 F 0 443 37.15 D 54376.1671 D Common Stock 2025-04-01 4 M 0 1118 37.15 A 55494.1671 D Common Stock 2025-04-01 4 F 0 463 37.15 D 55031.1671 D Common Stock 2025-04-01 4 M 0 1182 37.15 A 56213.1671 D Common Stock 2025-04-01 4 F 0 490 37.15 D 55723.1671 D Common Stock 36910.8405 I 401-k Restricted Stock Units 2025-04-01 4 A 0 5405 0 A Common Stock 5405 5405 D Restricted Stock Units 2025-04-01 4 M 0 5405 0 D Common Stock 5405 0 D Restricted Stock Units 2025-04-01 4 M 0 1069 0 D Common Stock 1069 0 D Restricted Stock Units 2025-04-01 4 M 0 1118 0 D Common Stock 1118 1152 D Restricted Stock Units 2025-04-01 4 M 0 1182 0 D Common Stock 1182 2401 D Upon vest, automatically converts into equal number of shares of common stock. Shares of common stock withheld for payment of tax liability for vested and converted RSU's. 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. 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, 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. Vested shares will be delivered to the reporting person upon vesting. 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. 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. /s/ Susan L. Rager-Parr, attorney-in-fact for Mark Kochvar 2025-04-03