Patrick J. Guinee - 11 Feb 2026 Form 4 Insider Report for FOSTER L B CO (FSTR)

Role: EVP General Counsel & Sec.
Signature: /s/ Patrick J. Guinee by Judith Balog, attorney-in-fact
Issuer symbol: FSTR
Transactions as of: 11 Feb 2026
Net transactions value: -$78,408
Form type: 4
Filing time: 12 Feb 2026, 16:31:50 UTC
Previous filing: 27 May 2025
Next filing: 09 Mar 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Guinee Patrick J.	EVP General Counsel & Sec.	L.B. FOSTER COMPANY, 415 HOLIDAY DRIVE, SUITE 100, PITTSBURGH	/s/ Patrick J. Guinee by Judith Balog, attorney-in-fact	12 Feb 2026	0001600919

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	FSTR	Common Stock	Options Exercise	$0	+1,667	+2%	$0.000000	84,382	11 Feb 2026	Direct	F1, F2, F3
transaction	FSTR	Common Stock	Tax liability	$25,831	-819	-0.97%	$31.54	83,563	11 Feb 2026	Direct	F2, F3

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	FSTR	Performance Stock Units	Options Exercise	$52,577	-1,667	-100%	$31.54	0	11 Feb 2026	Common Stock	1,667		Direct	F1, F4
holding	FSTR	Performance Stock Units						1,667	11 Feb 2026	Common Stock	1,667		Direct	F4

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	This amount represents 50 percent of the Performance-based stock unit award granted on 3/31/2021 and earned on 2/11/2026.
F2	Includes 15,874 Performance Restricted Stock Units earned under the 2023-2025 Long Term Incentive Plan granted on 2/14/2023; those 15,874 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2025, upon certification by the Compensation Committee.
F3	Includes 2,194 Performance Restricted Stock Units earned under the 2024-2026 Long Term Incentive Plan granted on 5/23/2024; those 2,194 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2026, upon certification by the Compensation Committee.
F4	Performance-based stock unit award of 3,333 shares was granted on 3/31/2021 and expires on 02/28/2026, 5 years after the grant date. Fifty percent of the award, or 1,666 shares, was earned on 4/05/2024. The remaining 50% of the award, or 1,667 shares, may be earned when the consecutive 30-day average closing stock price per share of the Company's common stock on the Nasdaq Stock Market is $30.00 per share or more and is generally subject to continued employment with the Company.