STBA

SEC source: 0001127602-25-011593 · form4.xml · nonDerivative · entry 4

Smydo Rachel Lynn · CIK 0001947722 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,697

F2 · kind: Shares of common stock withheld for payment of tax liability for vested and converted RSU's.

SEC source: 0001127602-25-011593 · form4.xml · nonDerivative · entry 3

Smydo Rachel Lynn · CIK 0001947722 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,806

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: Upon vest, automatically converts into equal number of shares of common stock.

SEC source: 0001127602-25-011593 · form4.xml · nonDerivative · entry 2

Smydo Rachel Lynn · CIK 0001947722 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,486

F2 · kind: Shares of common stock withheld for payment of tax liability for vested and converted RSU's.

SEC source: 0001127602-25-011593 · form4.xml · nonDerivative · entry 1

Smydo Rachel Lynn · CIK 0001947722 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,035

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: Upon vest, automatically converts into equal number of shares of common stock.

SEC source: 0001127602-25-011591 · form4.xml · derivative · entry 14

Michie James Arvo · CIK 0001940814 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,523

Underlying: Common Stock · 750 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F9 · security: 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.

F3 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of S&T Bancorp, Inc. common stock.

F1 · kind: Upon vest, automatically converts into equal number of shares of common stock.

F10 · derivative.exercise_date: 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.

F10 · derivative.expiration_date: 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.

SEC source: 0001127602-25-011591 · form4.xml · derivative · entry 13

Michie James Arvo · CIK 0001940814 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 721

Underlying: Common Stock · 698 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of S&T Bancorp, Inc. common stock.

F1 · kind: Upon vest, automatically converts into equal number of shares of common stock.

F8 · derivative.exercise_date: 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.

F8 · derivative.expiration_date: 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.

SEC source: 0001127602-25-011591 · form4.xml · derivative · entry 12

Michie James Arvo · CIK 0001940814 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 335 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of S&T Bancorp, Inc. common stock.

F1 · kind: Upon vest, automatically converts into equal number of shares of common stock.

F7 · derivative.exercise_date: 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.

F7 · derivative.expiration_date: 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.

SEC source: 0001127602-25-011591 · form4.xml · derivative · entry 11

Michie James Arvo · CIK 0001940814 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 1,686 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · derivative.exercise_price: 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.

F1 · kind: Upon vest, automatically converts into equal number of shares of common stock.

F6 · derivative.exercise_date: 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.

F6 · derivative.expiration_date: 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.

SEC source: 0001127602-25-011591 · form4.xml · derivative · entry 10

Michie James Arvo · CIK 0001940814 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,686

Underlying: Common Stock · 1,686 shares

Expires not disclosed

F5 · derivative.exercise_price: 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.

F6 · derivative.exercise_date: 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.

F6 · derivative.expiration_date: 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.

SEC source: 0001127602-25-011591 · form4.xml · nonDerivative · entry 8

Michie James Arvo · CIK 0001940814 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,945

F2 · kind: Shares of common stock withheld for payment of tax liability for vested and converted RSU's.

SEC source: 0001127602-25-011591 · form4.xml · nonDerivative · entry 7

Michie James Arvo · CIK 0001940814 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,201

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: Upon vest, automatically converts into equal number of shares of common stock.

SEC source: 0001127602-25-011591 · form4.xml · nonDerivative · entry 6

Michie James Arvo · CIK 0001940814 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,451

F2 · kind: Shares of common stock withheld for payment of tax liability for vested and converted RSU's.

SEC source: 0001127602-25-011591 · form4.xml · nonDerivative · entry 5

Michie James Arvo · CIK 0001940814 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,689

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: Upon vest, automatically converts into equal number of shares of common stock.

SEC source: 0001127602-25-011591 · form4.xml · nonDerivative · entry 4

Michie James Arvo · CIK 0001940814 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,991

F2 · kind: Shares of common stock withheld for payment of tax liability for vested and converted RSU's.

SEC source: 0001127602-25-011591 · form4.xml · nonDerivative · entry 3

Michie James Arvo · CIK 0001940814 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,106

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: Upon vest, automatically converts into equal number of shares of common stock.

SEC source: 0001127602-25-011591 · form4.xml · nonDerivative · entry 2

Michie James Arvo · CIK 0001940814 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,771

F2 · kind: Shares of common stock withheld for payment of tax liability for vested and converted RSU's.

SEC source: 0001127602-25-011591 · form4.xml · nonDerivative · entry 1

Michie James Arvo · CIK 0001940814 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,345

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: Upon vest, automatically converts into equal number of shares of common stock.

SEC source: 0001127602-25-011587 · form4.xml · derivative · entry 5

MCCOMISH CHRISTOPHER J. · CIK 0001744487 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,335

Underlying: Common Stock · 21,335 shares

Expires not disclosed

F7 · derivative.exercise_price: 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.

F8 · derivative.exercise_date: 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, a pre-selected date, or sooner upon the occurrence of certain events.

F9 · derivative.exercise_date: 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.

F8 · derivative.expiration_date: 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, a pre-selected date, or sooner upon the occurrence of certain events.

F9 · derivative.expiration_date: 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.

SEC source: 0001127602-25-011584 · form4.xml · derivative · entry 14

Yesho LaDawn D · CIK 0001568900 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,527

Underlying: Common Stock · 752 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F8 · security: 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.

F5 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of S&T Bancorp, Inc. common stock.

F1 · kind: Upon vest, automatically converts into equal number of shares of common stock.

F9 · derivative.exercise_date: 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.

F9 · derivative.expiration_date: 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.

SEC source: 0001127602-25-011584 · form4.xml · derivative · entry 13

Yesho LaDawn D · CIK 0001568900 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 716

Underlying: Common Stock · 694 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of S&T Bancorp, Inc. common stock.

F1 · kind: Upon vest, automatically converts into equal number of shares of common stock.

F7 · derivative.exercise_date: 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.

F7 · derivative.expiration_date: 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.

SEC source: 0001127602-25-011584 · form4.xml · derivative · entry 12

Yesho LaDawn D · CIK 0001568900 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 710 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of S&T Bancorp, Inc. common stock.

F1 · kind: Upon vest, automatically converts into equal number of shares of common stock.

F6 · derivative.exercise_date: 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.

F6 · derivative.expiration_date: 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.

SEC source: 0001127602-25-011584 · form4.xml · derivative · entry 11

Yesho LaDawn D · CIK 0001568900 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 3,585 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: 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.

F1 · kind: Upon vest, automatically converts into equal number of shares of common stock.

F4 · derivative.exercise_date: 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.

F4 · derivative.expiration_date: 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.

SEC source: 0001127602-25-011584 · form4.xml · derivative · entry 10

Yesho LaDawn D · CIK 0001568900 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,585

Underlying: Common Stock · 3,585 shares

Expires not disclosed

F3 · derivative.exercise_price: 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.

F4 · derivative.exercise_date: 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.

F4 · derivative.expiration_date: 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.

SEC source: 0001127602-25-011584 · form4.xml · nonDerivative · entry 8

Yesho LaDawn D · CIK 0001568900 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,163.7357

F2 · kind: Shares of common stock withheld for payment of tax liability for vested and converted RSU's.

SEC source: 0001127602-25-011584 · form4.xml · nonDerivative · entry 7

Yesho LaDawn D · CIK 0001568900 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,380.7357

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: Upon vest, automatically converts into equal number of shares of common stock.

SEC source: 0001127602-25-011584 · form4.xml · nonDerivative · entry 6

Yesho LaDawn D · CIK 0001568900 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,628.7357

F2 · kind: Shares of common stock withheld for payment of tax liability for vested and converted RSU's.

SEC source: 0001127602-25-011584 · form4.xml · nonDerivative · entry 5

Yesho LaDawn D · CIK 0001568900 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,828.7357

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: Upon vest, automatically converts into equal number of shares of common stock.

SEC source: 0001127602-25-011584 · form4.xml · nonDerivative · entry 4

Yesho LaDawn D · CIK 0001568900 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,134.7357

F2 · kind: Shares of common stock withheld for payment of tax liability for vested and converted RSU's.

SEC source: 0001127602-25-011584 · form4.xml · nonDerivative · entry 3

Yesho LaDawn D · CIK 0001568900 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,376.7357

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: Upon vest, automatically converts into equal number of shares of common stock.

SEC source: 0001127602-25-011584 · form4.xml · nonDerivative · entry 2

Yesho LaDawn D · CIK 0001568900 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,666.7357

F2 · kind: Shares of common stock withheld for payment of tax liability for vested and converted RSU's.

SEC source: 0001127602-25-011584 · form4.xml · nonDerivative · entry 1

Yesho LaDawn D · CIK 0001568900 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,846.7357

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: Upon vest, automatically converts into equal number of shares of common stock.

SEC source: 0001127602-25-011680 · form4a.xml · derivative · entry 16

Drahnak Stephen A. · CIK 0001538345 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,947

Underlying: Common Stock · 1,947 shares

Expires not disclosed

F12 · security: Filing delay due by April 3, 2025, caused by software unable to attach footnotes to awards.

F6 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of S&T Bancorp, Inc. common stock.

F13 · derivative.exercise_date: 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.

F13 · derivative.expiration_date: 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.

SEC source: 0001127602-25-011680 · form4a.xml · derivative · entry 15

Drahnak Stephen A. · CIK 0001538345 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,536

Underlying: Common Stock · 756 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F9 · security: 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.

F6 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of S&T Bancorp, Inc. common stock.

F1 · kind: Upon vest, automatically converts into equal number of shares of common stock.

F10 · derivative.exercise_date: 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.

F11 · derivative.expiration_date: 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.

SEC source: 0001127602-25-011680 · form4a.xml · derivative · entry 14

Drahnak Stephen A. · CIK 0001538345 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 738

Underlying: Common Stock · 714 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F6 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of S&T Bancorp, Inc. common stock.

F1 · kind: Upon vest, automatically converts into equal number of shares of common stock.

F8 · derivative.exercise_date: 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.

F8 · derivative.expiration_date: 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.

SEC source: 0001127602-25-011680 · form4a.xml · derivative · entry 13

Drahnak Stephen A. · CIK 0001538345 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 710 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F6 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of S&T Bancorp, Inc. common stock.

F1 · kind: Upon vest, automatically converts into equal number of shares of common stock.

F7 · derivative.exercise_date: 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.

F7 · derivative.expiration_date: 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.

SEC source: 0001127602-25-011680 · form4a.xml · derivative · entry 12

Drahnak Stephen A. · CIK 0001538345 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 3,585 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · derivative.exercise_price: 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.

F1 · kind: Upon vest, automatically converts into equal number of shares of common stock.

F5 · derivative.exercise_date: 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.

F5 · derivative.expiration_date: 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.

SEC source: 0001127602-25-011680 · form4a.xml · derivative · entry 11

Drahnak Stephen A. · CIK 0001538345 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,585

Underlying: Common Stock · 3,585 shares

Expires not disclosed

F4 · derivative.exercise_price: 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.

F5 · derivative.exercise_date: 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.

F5 · derivative.expiration_date: 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.

SEC source: 0001127602-25-011680 · form4a.xml · nonDerivative · entry 8

Drahnak Stephen A. · CIK 0001538345 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,660.953

F2 · kind: Shares of common stock withheld for payment of tax liability for vested and converted RSU's.

SEC source: 0001127602-25-011680 · form4a.xml · nonDerivative · entry 7

Drahnak Stephen A. · CIK 0001538345 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,991.953

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: Upon vest, automatically converts into equal number of shares of common stock.

SEC source: 0001127602-25-011680 · form4a.xml · nonDerivative · entry 6

Drahnak Stephen A. · CIK 0001538345 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,235.953

F2 · kind: Shares of common stock withheld for payment of tax liability for vested and converted RSU's.

SEC source: 0001127602-25-011680 · form4a.xml · nonDerivative · entry 5

Drahnak Stephen A. · CIK 0001538345 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,548.953

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: Upon vest, automatically converts into equal number of shares of common stock.

SEC source: 0001127602-25-011680 · form4a.xml · nonDerivative · entry 4

Drahnak Stephen A. · CIK 0001538345 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,834.953

F2 · kind: Shares of common stock withheld for payment of tax liability for vested and converted RSU's.

SEC source: 0001127602-25-011680 · form4a.xml · nonDerivative · entry 3

Drahnak Stephen A. · CIK 0001538345 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,145.953

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: Upon vest, automatically converts into equal number of shares of common stock.

SEC source: 0001127602-25-011680 · form4a.xml · nonDerivative · entry 2

Drahnak Stephen A. · CIK 0001538345 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,435.953

F2 · kind: Shares of common stock withheld for payment of tax liability for vested and converted RSU's.

SEC source: 0001127602-25-011680 · form4a.xml · nonDerivative · entry 1

Drahnak Stephen A. · CIK 0001538345 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,004.953

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: Upon vest, automatically converts into equal number of shares of common stock.

SEC source: 0001127602-25-011682 · form4a.xml · derivative · entry 15

ANTOLIK DAVID G · CIK 0001164377 · Director · PRESIDENT

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,410

Underlying: Common Stock · 3,410 shares

Expires not disclosed

F11 · security: Filing delay due by April 3, 2025, caused by software unable to attach footnotes to awards.

F5 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of S&T Bancorp, Inc. common stock.

F12 · derivative.exercise_date: 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.

F12 · derivative.expiration_date: 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.

SEC source: 0001127602-25-011682 · form4a.xml · derivative · entry 14

ANTOLIK DAVID G · CIK 0001164377 · Director · PRESIDENT

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,737

Underlying: Common Stock · 1,347 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F8 · security: 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.

F5 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of S&T Bancorp, Inc. common stock.

F1 · kind: Upon vest, automatically converts into equal number of shares of common stock.

F9 · derivative.exercise_date: 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.

F10 · derivative.expiration_date: 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.

SEC source: 0001127602-25-011682 · form4a.xml · derivative · entry 13

ANTOLIK DAVID G · CIK 0001164377 · Director · PRESIDENT

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,316

Underlying: Common Stock · 1,276 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of S&T Bancorp, Inc. common stock.

F1 · kind: Upon vest, automatically converts into equal number of shares of common stock.

F7 · derivative.exercise_date: 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.

F7 · derivative.expiration_date: 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.

SEC source: 0001127602-25-011682 · form4a.xml · derivative · entry 12

ANTOLIK DAVID G · CIK 0001164377 · Director · PRESIDENT

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 2,302 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of S&T Bancorp, Inc. common stock.

F1 · kind: Upon vest, automatically converts into equal number of shares of common stock.

F6 · derivative.exercise_date: 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.

F6 · derivative.expiration_date: 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.

SEC source: 0001127602-25-011682 · form4a.xml · derivative · entry 11

ANTOLIK DAVID G · CIK 0001164377 · Director · PRESIDENT

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 11,641 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: 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.

F1 · kind: Upon vest, automatically converts into equal number of shares of common stock.

F4 · derivative.exercise_date: 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.

F4 · derivative.expiration_date: 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.