FOSTER L B CO — Director's Dealing 2026

Feb 23, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: FOSTER L B CO (FSTR)
CIK: 0000352825
Period of Report: 2026-02-19

Reporting Person: O'Neill Jamie F (SVP, Human Resources)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-02-19	Common Stock	A	1434	—	Acquired	14462	Direct
2026-02-19	Common Stock	A	682	—	Acquired	15144	Direct
2026-02-19	Common Stock	A	475	—	Acquired	15619	Direct
2026-02-19	Common Stock	A	2396	—	Acquired	18015	Direct
2026-02-19	Common Stock	F	1507	$31.125	Disposed	16508	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	141	Indirect

Footnotes

F1: Represents the number of shares of common stock resulting from Performance Share Units earned under the 2023-2025 Long Term Incentive Plan granted on 2/14/2023 upon certification of performance results by the Compensation Committee at 47.2% for the annual period ended December 31, 2025.

F2: Includes 4,608 shares of common stock resulting from the settlement of Performance Restricted Stock Units earned under the 2023-2025 Long Term Incentive Plan granted on 2/14/2023; those 4,608 Performance Restricted Stock Units settled at the end of the 2023-2025 performance period upon certification by the Compensation Committee on 2/19/2026.

F3: Includes 445 Performance Restricted Stock Units earned under the 2024-2026 Long Term Incentive Plan granted on 5/23/2024; those 445 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2026, upon certification by the Compensation Committee.

F4: Represents the number of Performance Restricted Stock Units earned under the 2024-2026 Long Term Incentive Plan granted on 5/23/2024 upon certification of performance results by the Compensation Committee at 39.5% for the annual period ended December 31, 2025. The earned Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2026, upon certification by the Compensation Committee.

F5: Includes 1,127 Performance Restricted Stock Units earned under the 2024-2026 Long Term Incentive Plan granted on 5/23/2024; those 1,127 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2026, upon certification of the Compensation Committee.

F6: Represents the number of Performance Restricted Stock Units earned under the 2025-2027 Long Term Incentive Plan granted on 5/22/2025 upon certification of performance results by the Compensation Committee at 11.2% for the annual period ended December 31, 2025. The earned Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2027, upon certification by the Compensation Committee.

F7: Includes 475 Performance Restricted Stock Units earned under the 2025-2027 Long Term Incentive Plan granted on 5/22/2025; those 475 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2027, upon certification by the Compensation Committee.

F8: Award of restricted stock units (RSUs), which are settled in stock upon vesting, and generally will vest ratably over a three-year period on the first, second, and third anniversary of the date of grant.

F9: Shares withheld to pay taxes upon the vesting and settlement of all earned performance shares related to the 2023-2025 LTIP awarded on 2/14/2023.