{"transactions":[{"id":762871,"issuer":{"id":5689,"kind":"organization","name":"FOSTER L B CO"},"owners":[{"id":44020,"kind":"person","name":"Rolli Sara Fay","position":1,"cik":"0002048182","reported_name":"Rolli Sara Fay","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Operational Admin"}}],"security":"Common Stock","published_at":"2026-05-27T19:31:50.000Z","date":"2026-05-22","kind":"tax_withholding","planned":false,"acquired":false,"shares":352,"price":38.11,"value":13414.72,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares withheld to pay taxes applicable to the vesting of restricted stock related to the 2025-2027 LTIP awarded on 5/22/25."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 966 Performance Restricted Stock Units earned under the 2024-2026 Long Term Incentive Plan granted on 5/23/2024; those 966 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2026, upon certification of the Compensation Committee."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 407 Performance Restricted Stock Units earned under the 2025-2027 Long Term Incentive Plan granted on 5/22/2025; those 407 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2027, upon certification by the Compensation Committee."}],"balance_after":9224,"source":{"system":"sec-edgar","filing":"0002048182-26-000010","document":"wk-form4_1779910307.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/352825/000204818226000010/wk-form4_1779910307.xml","form_type":"4"}},{"id":871915,"issuer":{"id":5689,"kind":"organization","name":"FOSTER L B CO"},"owners":[{"id":44020,"kind":"person","name":"Rolli Sara Fay","position":1,"cik":"0002048182","reported_name":"Rolli Sara Fay","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Operational Admin"}}],"security":"Common Stock","published_at":"2026-03-03T20:41:17.000Z","date":"2026-03-01","kind":"tax_withholding","planned":false,"acquired":false,"shares":72,"price":30.73,"value":2212.56,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares withheld to pay taxes applicable to the vesting of restricted stock related to the March 1, 2022 Non-Executive Restricted Stock Award."}],"balance_after":9576,"source":{"system":"sec-edgar","filing":"0000352825-26-000013","document":"wk-form4_1772570474.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/352825/000035282526000013/wk-form4_1772570474.xml","form_type":"4"}},{"id":871914,"issuer":{"id":5689,"kind":"organization","name":"FOSTER L B CO"},"owners":[{"id":44020,"kind":"person","name":"Rolli Sara Fay","position":1,"cik":"0002048182","reported_name":"Rolli Sara Fay","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Operational Admin"}}],"security":"Common Stock","published_at":"2026-03-03T20:38:12.000Z","date":"2026-02-19","kind":"tax_withholding","planned":false,"acquired":false,"shares":1499,"price":31.125,"value":46656.375,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F10","text":"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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F6","text":"Includes 966 Performance Restricted Stock Units earned under the 2024-2026 Long Term Incentive Plan granted on 5/23/2024; those 966 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2026, upon certification of the Compensation Committee."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F8","text":"Includes 407 Performance Restricted Stock Units earned under the 2025-2027 Long Term Incentive Plan granted on 5/22/2025; those 407 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2027, upon certification by the Compensation Committee."}],"balance_after":9648,"source":{"system":"sec-edgar","filing":"0002048182-26-000008","document":"wk-form4a_1772570290.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/352825/000204818226000008/wk-form4a_1772570290.xml","form_type":"4/A","original_submission_date":"2026-02-23"}},{"id":871913,"issuer":{"id":5689,"kind":"organization","name":"FOSTER L B CO"},"owners":[{"id":44020,"kind":"person","name":"Rolli Sara Fay","position":1,"cik":"0002048182","reported_name":"Rolli Sara Fay","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Operational Admin"}}],"security":"Common Stock","published_at":"2026-03-03T20:38:12.000Z","date":"2026-02-19","kind":"grant","planned":false,"acquired":true,"shares":1985,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F9","text":"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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 3,072 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 3,072 Performance Restricted Stock Units settled at the end of the 2023-2025 performance period upon certification by the Compensation Committee on 2/19/2026."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F6","text":"Includes 966 Performance Restricted Stock Units earned under the 2024-2026 Long Term Incentive Plan granted on 5/23/2024; those 966 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2026, upon certification of the Compensation Committee."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F8","text":"Includes 407 Performance Restricted Stock Units earned under the 2025-2027 Long Term Incentive Plan granted on 5/22/2025; those 407 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2027, upon certification by the Compensation Committee."}],"balance_after":11147,"source":{"system":"sec-edgar","filing":"0002048182-26-000008","document":"wk-form4a_1772570290.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/352825/000204818226000008/wk-form4a_1772570290.xml","form_type":"4/A","original_submission_date":"2026-02-23"}},{"id":871912,"issuer":{"id":5689,"kind":"organization","name":"FOSTER L B CO"},"owners":[{"id":44020,"kind":"person","name":"Rolli Sara Fay","position":1,"cik":"0002048182","reported_name":"Rolli Sara Fay","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Operational Admin"}}],"security":"Common Stock","published_at":"2026-03-03T20:38:12.000Z","date":"2026-02-19","kind":"grant","planned":false,"acquired":true,"shares":407,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F7","text":"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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 3,072 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 3,072 Performance Restricted Stock Units settled at the end of the 2023-2025 performance period upon certification by the Compensation Committee on 2/19/2026."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F6","text":"Includes 966 Performance Restricted Stock Units earned under the 2024-2026 Long Term Incentive Plan granted on 5/23/2024; those 966 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2026, upon certification of the Compensation Committee."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F8","text":"Includes 407 Performance Restricted Stock Units earned under the 2025-2027 Long Term Incentive Plan granted on 5/22/2025; those 407 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2027, upon certification by the Compensation Committee."}],"balance_after":9162,"source":{"system":"sec-edgar","filing":"0002048182-26-000008","document":"wk-form4a_1772570290.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/352825/000204818226000008/wk-form4a_1772570290.xml","form_type":"4/A","original_submission_date":"2026-02-23"}},{"id":871911,"issuer":{"id":5689,"kind":"organization","name":"FOSTER L B CO"},"owners":[{"id":44020,"kind":"person","name":"Rolli Sara Fay","position":1,"cik":"0002048182","reported_name":"Rolli Sara Fay","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Operational Admin"}}],"security":"Common Stock","published_at":"2026-03-03T20:38:12.000Z","date":"2026-02-19","kind":"grant","planned":false,"acquired":true,"shares":584,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F5","text":"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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 3,072 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 3,072 Performance Restricted Stock Units settled at the end of the 2023-2025 performance period upon certification by the Compensation Committee on 2/19/2026."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F6","text":"Includes 966 Performance Restricted Stock Units earned under the 2024-2026 Long Term Incentive Plan granted on 5/23/2024; those 966 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2026, upon certification of the Compensation Committee."}],"balance_after":8755,"source":{"system":"sec-edgar","filing":"0002048182-26-000008","document":"wk-form4a_1772570290.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/352825/000204818226000008/wk-form4a_1772570290.xml","form_type":"4/A","original_submission_date":"2026-02-23"}},{"id":871910,"issuer":{"id":5689,"kind":"organization","name":"FOSTER L B CO"},"owners":[{"id":44020,"kind":"person","name":"Rolli Sara Fay","position":1,"cik":"0002048182","reported_name":"Rolli Sara Fay","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Operational Admin"}}],"security":"Common Stock","published_at":"2026-03-03T20:38:12.000Z","date":"2026-02-19","kind":"grant","planned":false,"acquired":true,"shares":956,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 3,072 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 3,072 Performance Restricted Stock Units settled at the end of the 2023-2025 performance period upon certification by the Compensation Committee on 2/19/2026."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 382 Performance Restricted Stock Units earned under the 2024-2026 Long Term Incentive Plan granted on 5/23/2024; those 382 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2026, upon certification by the Compensation Committee."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"This amended Form 4 was filed to correct the number of shares beneficially owned to reflect the amendment made to the Form 4 originally filed on 2/18/26.  The amendment to the Form 4 was filed on 3/03/26 to correct the number of shares withheld to pay taxes applicable to the vesting of restricted stock on 2/13/26 and 2/14/26."}],"balance_after":8171,"source":{"system":"sec-edgar","filing":"0002048182-26-000008","document":"wk-form4a_1772570290.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/352825/000204818226000008/wk-form4a_1772570290.xml","form_type":"4/A","original_submission_date":"2026-02-23"}},{"id":871909,"issuer":{"id":5689,"kind":"organization","name":"FOSTER L B CO"},"owners":[{"id":44020,"kind":"person","name":"Rolli Sara Fay","position":1,"cik":"0002048182","reported_name":"Rolli Sara Fay","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Operational Admin"}}],"security":"Common Stock","published_at":"2026-03-03T20:35:24.000Z","date":"2026-02-14","kind":"tax_withholding","planned":false,"acquired":false,"shares":221,"price":31.63,"value":6990.23,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F4","text":"This amended Form 4 was filed to also correct the number of shares withheld to pay taxes applicable to the vesting of restricted stock related to the 2023-2025 LTIP awarded on 2/14/23."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 2,116 Performance Restricted Stock Units earned under the 2023-2025 Long Term Incentive Plan granted on 2/14/2023; those 2,116 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2025, upon certification by the Compensation Committee."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 382 Performance Restricted Stock Units earned under the 2024-2026 Long Term Incentive Plan granted on 5/23/2024; those 382 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2026, upon certification by the Compensation Committee."}],"balance_after":7215,"source":{"system":"sec-edgar","filing":"0002048182-26-000006","document":"wk-form4a_1772570121.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/352825/000204818226000006/wk-form4a_1772570121.xml","form_type":"4/A","original_submission_date":"2026-02-18"}},{"id":871908,"issuer":{"id":5689,"kind":"organization","name":"FOSTER L B CO"},"owners":[{"id":44020,"kind":"person","name":"Rolli Sara Fay","position":1,"cik":"0002048182","reported_name":"Rolli Sara Fay","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Operational Admin"}}],"security":"Common Stock","published_at":"2026-03-03T20:35:24.000Z","date":"2026-02-13","kind":"tax_withholding","planned":false,"acquired":false,"shares":161,"price":31.63,"value":5092.43,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"This amended Form 4 was filed to correct the number of shares withheld to pay taxes applicable to the vesting of restricted stock related to the 2024-2026 LTIP awarded on 5/23/24."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 2,116 Performance Restricted Stock Units earned under the 2023-2025 Long Term Incentive Plan granted on 2/14/2023; those 2,116 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2025, upon certification by the Compensation Committee."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 382 Performance Restricted Stock Units earned under the 2024-2026 Long Term Incentive Plan granted on 5/23/2024; those 382 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2026, upon certification by the Compensation Committee."}],"balance_after":7436,"source":{"system":"sec-edgar","filing":"0002048182-26-000006","document":"wk-form4a_1772570121.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/352825/000204818226000006/wk-form4a_1772570121.xml","form_type":"4/A","original_submission_date":"2026-02-18"}},{"id":889503,"issuer":{"id":5689,"kind":"organization","name":"FOSTER L B CO"},"owners":[{"id":44020,"kind":"person","name":"Rolli Sara Fay","position":1,"cik":"0002048182","reported_name":"Rolli Sara Fay","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Operational Admin"}}],"security":"Common Stock","published_at":"2026-02-23T21:15:25.000Z","date":"2026-02-19","kind":"tax_withholding","planned":false,"acquired":false,"shares":1499,"price":31.125,"value":46656.375,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F9","text":"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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Includes 966 Performance Restricted Stock Units earned under the 2024-2026 Long Term Incentive Plan granted on 5/23/2024; those 966 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2026, upon certification of the Compensation Committee."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F7","text":"Includes 407 Performance Restricted Stock Units earned under the 2025-2027 Long Term Incentive Plan granted on 5/22/2025; those 407 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2027, upon certification by the Compensation Committee."}],"balance_after":9765,"source":{"system":"sec-edgar","filing":"0002048182-26-000004","document":"wk-form4_1771881322.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/352825/000204818226000004/wk-form4_1771881322.xml","form_type":"4"}},{"id":889502,"issuer":{"id":5689,"kind":"organization","name":"FOSTER L B CO"},"owners":[{"id":44020,"kind":"person","name":"Rolli Sara Fay","position":1,"cik":"0002048182","reported_name":"Rolli Sara Fay","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Operational Admin"}}],"security":"Common Stock","published_at":"2026-02-23T21:15:25.000Z","date":"2026-02-19","kind":"grant","planned":false,"acquired":true,"shares":1985,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F8","text":"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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 3,072 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 3,072 Performance Restricted Stock Units settled at the end of the 2023-2025 performance period upon certification by the Compensation Committee on 2/19/2026."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Includes 966 Performance Restricted Stock Units earned under the 2024-2026 Long Term Incentive Plan granted on 5/23/2024; those 966 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2026, upon certification of the Compensation Committee."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F7","text":"Includes 407 Performance Restricted Stock Units earned under the 2025-2027 Long Term Incentive Plan granted on 5/22/2025; those 407 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2027, upon certification by the Compensation Committee."}],"balance_after":11264,"source":{"system":"sec-edgar","filing":"0002048182-26-000004","document":"wk-form4_1771881322.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/352825/000204818226000004/wk-form4_1771881322.xml","form_type":"4"}},{"id":889501,"issuer":{"id":5689,"kind":"organization","name":"FOSTER L B CO"},"owners":[{"id":44020,"kind":"person","name":"Rolli Sara Fay","position":1,"cik":"0002048182","reported_name":"Rolli Sara Fay","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Operational Admin"}}],"security":"Common Stock","published_at":"2026-02-23T21:15:25.000Z","date":"2026-02-19","kind":"grant","planned":false,"acquired":true,"shares":407,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F6","text":"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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 3,072 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 3,072 Performance Restricted Stock Units settled at the end of the 2023-2025 performance period upon certification by the Compensation Committee on 2/19/2026."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Includes 966 Performance Restricted Stock Units earned under the 2024-2026 Long Term Incentive Plan granted on 5/23/2024; those 966 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2026, upon certification of the Compensation Committee."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F7","text":"Includes 407 Performance Restricted Stock Units earned under the 2025-2027 Long Term Incentive Plan granted on 5/22/2025; those 407 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2027, upon certification by the Compensation Committee."}],"balance_after":9279,"source":{"system":"sec-edgar","filing":"0002048182-26-000004","document":"wk-form4_1771881322.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/352825/000204818226000004/wk-form4_1771881322.xml","form_type":"4"}},{"id":889500,"issuer":{"id":5689,"kind":"organization","name":"FOSTER L B CO"},"owners":[{"id":44020,"kind":"person","name":"Rolli Sara Fay","position":1,"cik":"0002048182","reported_name":"Rolli Sara Fay","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Operational Admin"}}],"security":"Common Stock","published_at":"2026-02-23T21:15:25.000Z","date":"2026-02-19","kind":"grant","planned":false,"acquired":true,"shares":584,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F4","text":"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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 3,072 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 3,072 Performance Restricted Stock Units settled at the end of the 2023-2025 performance period upon certification by the Compensation Committee on 2/19/2026."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F5","text":"Includes 966 Performance Restricted Stock Units earned under the 2024-2026 Long Term Incentive Plan granted on 5/23/2024; those 966 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2026, upon certification of the Compensation Committee."}],"balance_after":8872,"source":{"system":"sec-edgar","filing":"0002048182-26-000004","document":"wk-form4_1771881322.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/352825/000204818226000004/wk-form4_1771881322.xml","form_type":"4"}},{"id":889499,"issuer":{"id":5689,"kind":"organization","name":"FOSTER L B CO"},"owners":[{"id":44020,"kind":"person","name":"Rolli Sara Fay","position":1,"cik":"0002048182","reported_name":"Rolli Sara Fay","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Operational Admin"}}],"security":"Common Stock","published_at":"2026-02-23T21:15:25.000Z","date":"2026-02-19","kind":"grant","planned":false,"acquired":true,"shares":956,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 3,072 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 3,072 Performance Restricted Stock Units settled at the end of the 2023-2025 performance period upon certification by the Compensation Committee on 2/19/2026."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 382 Performance Restricted Stock Units earned under the 2024-2026 Long Term Incentive Plan granted on 5/23/2024; those 382 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2026, upon certification by the Compensation Committee."}],"balance_after":8288,"source":{"system":"sec-edgar","filing":"0002048182-26-000004","document":"wk-form4_1771881322.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/352825/000204818226000004/wk-form4_1771881322.xml","form_type":"4"}},{"id":899276,"issuer":{"id":5689,"kind":"organization","name":"FOSTER L B CO"},"owners":[{"id":44020,"kind":"person","name":"Rolli Sara Fay","position":1,"cik":"0002048182","reported_name":"Rolli Sara Fay","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Operational Admin"}}],"security":"Common Stock","published_at":"2026-02-18T20:23:43.000Z","date":"2026-02-14","kind":"tax_withholding","planned":false,"acquired":false,"shares":153,"price":31.63,"value":4839.39,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F4","text":"Shares withheld to pay taxes applicable to the vesting of restricted stock related to the 2023-2025 LTIP awarded on 2/14/23."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 2,116 Performance Restricted Stock Units earned under the 2023-2025 Long Term Incentive Plan granted on 2/14/2023; those 2,116 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2025, upon certification by the Compensation Committee."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 382 Performance Restricted Stock Units earned under the 2024-2026 Long Term Incentive Plan granted on 5/23/2024; those 382 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2026, upon certification by the Compensation Committee."}],"balance_after":7332,"source":{"system":"sec-edgar","filing":"0002048182-26-000002","document":"wk-form4_1771446216.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/352825/000204818226000002/wk-form4_1771446216.xml","form_type":"4"}},{"id":899275,"issuer":{"id":5689,"kind":"organization","name":"FOSTER L B CO"},"owners":[{"id":44020,"kind":"person","name":"Rolli Sara Fay","position":1,"cik":"0002048182","reported_name":"Rolli Sara Fay","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Operational Admin"}}],"security":"Common Stock","published_at":"2026-02-18T20:23:43.000Z","date":"2026-02-13","kind":"tax_withholding","planned":false,"acquired":false,"shares":112,"price":31.63,"value":3542.56,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares withheld to pay taxes applicable to the vesting of restricted stock related to the 2024-2026 LTIP awarded on 5/23/24."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 2,116 Performance Restricted Stock Units earned under the 2023-2025 Long Term Incentive Plan granted on 2/14/2023; those 2,116 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2025, upon certification by the Compensation Committee."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 382 Performance Restricted Stock Units earned under the 2024-2026 Long Term Incentive Plan granted on 5/23/2024; those 382 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2026, upon certification by the Compensation Committee."}],"balance_after":7485,"source":{"system":"sec-edgar","filing":"0002048182-26-000002","document":"wk-form4_1771446216.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/352825/000204818226000002/wk-form4_1771446216.xml","form_type":"4"}},{"id":1134381,"issuer":{"id":5689,"kind":"organization","name":"FOSTER L B CO"},"owners":[{"id":44020,"kind":"person","name":"Rolli Sara Fay","position":1,"cik":"0002048182","reported_name":"Rolli Sara Fay","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Operational Admin"}}],"security":"Common Stock","published_at":"2025-05-27T21:11:17.000Z","date":"2025-05-23","kind":"tax_withholding","planned":false,"acquired":false,"shares":104,"price":18.18,"value":1890.72,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F3","text":"Shares withheld to pay taxes applicable to the vesting of restricted stock related to the 2024-2026 LTIP awarded on 5/23/24."}],"balance_after":7597,"source":{"system":"sec-edgar","filing":"0000352825-25-000098","document":"wk-form4_1748380269.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/352825/000035282525000098/wk-form4_1748380269.xml","form_type":"4"}},{"id":1134380,"issuer":{"id":5689,"kind":"organization","name":"FOSTER L B CO"},"owners":[{"id":44020,"kind":"person","name":"Rolli Sara Fay","position":1,"cik":"0002048182","reported_name":"Rolli Sara Fay","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Operational Admin"}}],"security":"Common Stock","published_at":"2025-05-27T21:11:17.000Z","date":"2025-05-22","kind":"grant","planned":false,"acquired":true,"shares":2426,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes 2,116 Performance Restricted Stock Units earned under the 2023-2025 Long Term Incentive Plan granted on 2/14/2023; those2,116 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2025, upon certification by the Compensation Committee."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 382 Performance Restricted Stock Units earned under the 2024-2026 Long Term Incentive Plan granted on 5/23/2024; those 382 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2026, upon certification by the Compensation Committee."}],"balance_after":7701,"source":{"system":"sec-edgar","filing":"0000352825-25-000098","document":"wk-form4_1748380269.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/352825/000035282525000098/wk-form4_1748380269.xml","form_type":"4"}},{"id":1233317,"issuer":{"id":5689,"kind":"organization","name":"FOSTER L B CO"},"owners":[{"id":44020,"kind":"person","name":"Rolli Sara Fay","position":1,"cik":"0002048182","reported_name":"Rolli Sara Fay","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Operational Admin"}}],"security":"Common Stock","published_at":"2025-03-04T20:22:23.000Z","date":"2025-03-01","kind":"tax_withholding","planned":false,"acquired":false,"shares":85,"price":27.45,"value":2333.25,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares withheld to pay taxes applicable to the vesting of restricted stock related to the March 1, 2022 Discretionary Award."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 2,116 Performance Restricted Stock Units earned under the 2023-2025 Long Term Incentive Plan granted on 2/14/2023; those 2,116 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2025, upon certification by the Compensation Committee."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Includes 382 Performance Restricted Stock Units earned under the 2024-2026 Long Term Incentive Plan granted on 5/23/2024; those 382 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2026, upon certification of the Compensation Committee."}],"balance_after":5275,"source":{"system":"sec-edgar","filing":"0000352825-25-000051","document":"wk-form4_1741119737.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/352825/000035282525000051/wk-form4_1741119737.xml","form_type":"4"}},{"id":1251370,"issuer":{"id":5689,"kind":"organization","name":"FOSTER L B CO"},"owners":[{"id":44020,"kind":"person","name":"Rolli Sara Fay","position":1,"cik":"0002048182","reported_name":"Rolli Sara Fay","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Operational Admin"}}],"security":"Common Stock","published_at":"2025-02-24T22:22:39.000Z","date":"2025-02-20","kind":"grant","planned":false,"acquired":true,"shares":382,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F3","text":"Represents the number of Performance Restricted Stock Units under the 2024-2026 Long Term Incentive Plan granted on 5/23/2024 upon certification of performance results by the Compensation Committee at 25.8% for the annual period ended December 31, 2024.  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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 2,116 Performance Restricted Stock Units earned under the 2023-2025 Long Term Incentive Plan granted on 2/14/2023; those 2,116 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2025, upon certification by the Compensation Committee."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"Includes 382 Performance Restricted Stock Units earned under the 2024-2026 Long Term Incentive Plan granted on 5/23/2024; those 382 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2026, upon certification of the Compensation Committee."}],"balance_after":5360,"source":{"system":"sec-edgar","filing":"0000352825-25-000032","document":"wk-form4_1740435752.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/352825/000035282525000032/wk-form4_1740435752.xml","form_type":"4"}},{"id":1251369,"issuer":{"id":5689,"kind":"organization","name":"FOSTER L B CO"},"owners":[{"id":44020,"kind":"person","name":"Rolli Sara Fay","position":1,"cik":"0002048182","reported_name":"Rolli Sara Fay","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Operational Admin"}}],"security":"Common Stock","published_at":"2025-02-24T22:22:39.000Z","date":"2025-02-20","kind":"grant","planned":false,"acquired":true,"shares":980,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents the number of Performance Restricted Stock 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 48.4% for the annual period ended December 31, 2024.  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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 2,116 Performance Restricted Stock Units earned under the 2023-2025 Long Term Incentive Plan granted on 2/14/2023; those 2,116 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2025, upon certification by the Compensation Committee."}],"balance_after":4978,"source":{"system":"sec-edgar","filing":"0000352825-25-000032","document":"wk-form4_1740435752.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/352825/000035282525000032/wk-form4_1740435752.xml","form_type":"4"}},{"id":1262363,"issuer":{"id":5689,"kind":"organization","name":"FOSTER L B CO"},"owners":[{"id":44020,"kind":"person","name":"Rolli Sara Fay","position":1,"cik":"0002048182","reported_name":"Rolli Sara Fay","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, Operational Admin"}}],"security":"Common Stock","published_at":"2025-02-19T21:11:15.000Z","date":"2025-02-14","kind":"tax_withholding","planned":false,"acquired":false,"shares":153,"price":27.5,"value":4207.5,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Shares withheld to pay taxes applicable to the vesting of restricted stock related to the 2023-2025 LTIP awarded on 02/14/23."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 1,136 Performance Restricted Stock Units earned under the 2023-2025 Long Term Incentive Plan granted on 2/14/2023; those 1,136 Performance Restricted Stock Units will settle at the end of the performance period on December 31, 2025, upon certification by the Compensation Committee."}],"balance_after":3998,"source":{"system":"sec-edgar","filing":"0000352825-25-000026","document":"wk-form4_1739999466.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/352825/000035282525000026/wk-form4_1739999466.xml","form_type":"4"}}]}