X0609 4 2026-04-01 0 0000719220 S&T BANCORP INC STBA 0001164377 ANTOLIK DAVID G false 800 PHILADELPHIA STREET INDIANA PA 15701 1 1 0 0 PRESIDENT 0 Common Stock 2026-04-01 4 M 0 5493 42.28 A 70046 D Common Stock 2026-04-01 4 F 0 2403 42.28 D 67643 D Common Stock 2026-04-01 4 M 0 1316 42.28 A 68959 D Common Stock 2026-04-01 4 F 0 576 42.28 D 68383 D Common Stock 2026-04-01 4 M 0 1347 42.28 A 69730 D Common Stock 2026-04-01 4 F 0 590 42.28 D 69140 D Common Stock 2026-04-01 4 M 0 1125 42.28 A 70265 D Common Stock 2026-04-01 4 F 0 493 42.28 D 69772 D Common Stock 11745.251 I 401k Restricted Stock Units 2026-04-01 4 A 0 5493 0 A Common Stock 5493 5493 D Restricted Stock Units 2026-04-01 4 M 0 5493 0 D Common Stock 5493 0 D Restricted Stock Units 2026-04-01 4 M 0 1316 0 D Common Stock 1316 0 D Restricted Stock Units 2026-04-01 4 M 0 1347 0 D Common Stock 1347 1390 D Restricted Stock Units 2026-04-01 4 M 0 1125 0 D Common Stock 1125 2285 D Restricted Stock Units 2026-04-01 4 A 0 3108 0 A Common Stock 3108 3108 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 restricted stock units. Acquired upon achievement of certain performance criteria pursuant to the performance-based restricted stock units granted April 1, 2023, under the Issuer's 2023 Long Term Incentive Plan. The performance period for the restricted stock units was January 1, 2023, until December 31, 2025, with achievement of the applicable performance criteria subject to determination by the Issuer's Compensation Committee. This determination was obtained on March 24, 2026. The restricted performance units awarded on April 1, 2023 vesting on April 1, 2026. 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, 2024. 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. Vested shares will be delivered to the reporting person upon vesting. 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. The restricted stock units vest in three equal annual installments beginning April 1, 2027. Vested shares will be delivered to the reporting person upon vesting. /s/ Jackie Kennane, attorney-in-fact for David G. Antolik 2026-04-03