Sec Form 4 Filing - Friedman Brian Hunter @ FOSTER L B CO - 2024-02-13

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Friedman Brian Hunter 2. Issuer Name and Ticker or Trading Symbol FOSTER L B CO [ FSTR] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) SVP, Steel Products (Last) (First) (Middle) L.B. FOSTER COMPANY, 415 HOLIDAY DRIVE, SUITE 100 3. Date of Earliest Transaction (MM/DD/YY) 02/13/2024 (Street) PITTSBURGH, PA15220 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 02/13/2024 A 1,614 ( 1 ) A $ 0 12,475 ( 2 ) D Common Stock 02/13/2024 A 4,261 ( 3 ) A $ 0 16,736 D Common Stock 02/14/2024 F 501 ( 4 ) D $ 24 16,235 D Common Stock 897 I L.B. Foster Company 401(k) Plan Shares

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Friedman Brian Hunter L.B. FOSTER COMPANY 415 HOLIDAY DRIVE, SUITE 100 PITTSBURGH, PA15220 SVP, Steel Products Signatures Brian Hunter Friedman by Judith Balog, attorney-in-fact 02/15/2024 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Represents the number of Performance Restricted Stock Units earned under the 2022-2024 Long Term Incentive Plan granted on 02/17/2022 upon certification of performance results by the Compensation Committee at 96.3% for the annual period ended December 31, 2023. The earned Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2024, upon certification by the Compensation Committee. ( 2 )Includes 1,049 Performance Restricted Stock Units earned under the 2022-2024 Long Term Incentive Plan granted on 02/17/2022; those 1,049 PSUs will settle at the end of the 2022-2024 performance period on December 31, 2024 upon certification by the Compensation Committee. ( 3 )Represents the number of Performance Restricted Stock Units earned under the 2023-2025 Long Term Incentive Plan granted on 02/14/2023 upon certification of performance results by the Compensation Committee at 187.0% for the annual period ended December 31, 2023. The earned Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2025, upon certification by the Compensation Committee. ( 4 )Shares withheld to pay taxes applicable to the vesting of restricted stock related to the 2023-2025 LTIP awarded on 02/14/23.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

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