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The RSUs vest on the earlier to occur of (1) the next annual meeting of the Company's stockholders following the date of grant (so long as such next annual meeting is at least 50 weeks after the immediately preceding year's annual meeting of stockholders) and (2) the one-year anniversary of the date of grant, provided that, in each case, the Reporting Person continues to serve as a director of the Company through such date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Form 4 filed by the Reporting Person on May 11, 2026 incorrectly reported the Amount of Securities Beneficially Owned following Reported Transaction in Column 5 of Table I. The correct number should have been 9,588."}],"balance_after":11529,"source":{"system":"sec-edgar","filing":"0001213900-26-066856","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2079999/000121390026066856/ownership.xml","form_type":"4"}},{"id":769857,"issuer":{"id":5724,"kind":"organization","name":"Orion Group Holdings Inc","symbol":"ORN"},"owners":[{"id":40159,"kind":"person","name":"SHANFELTER AUSTIN J","position":1,"cik":"0001221430","reported_name":"SHANFELTER AUSTIN J","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-05-20T21:54:15.000Z","date":"2026-05-19","kind":"grant","planned":false,"acquired":true,"shares":7236,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The restricted shares are subject to cliff vesting on the date of the Company's 2027 annual general meeting, expected to occur in May 2027, contingent upon the reporting person's continued service through the vesting date."}],"balance_after":336451,"source":{"system":"sec-edgar","filing":"0001221430-26-000003","document":"form4-05202026_090511.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1402829/000122143026000003/form4-05202026_090511.xml","form_type":"4"}},{"id":785106,"issuer":{"id":5180,"kind":"organization","name":"Cardinal Infrastructure Group Inc."},"owners":[{"id":40159,"kind":"person","name":"SHANFELTER AUSTIN J","position":1,"cik":"0001221430","reported_name":"SHANFELTER AUSTIN J","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2026-05-11T21:00:15.000Z","date":"2026-05-07","kind":"grant","planned":false,"acquired":true,"shares":3101,"price":24.18,"value":74982.18,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"These shares represent restricted stock units (\"RSUs\") granted on May 7, 2026. The RSUs vest as follows, subject to the Reporting Person's continued service through each applicable vesting date: (i) 775 RSUs vested immediately upon execution of the award agreement; (ii) 775 RSUs will vest on June 30, 2026; (iii) 775 RSUs will vest on September 30, 2026; and (iv) 776 RSUs will vest on December 31, 2026."}],"balance_after":8726,"source":{"system":"sec-edgar","filing":"0001213900-26-054544","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2079999/000121390026054544/ownership.xml","form_type":"4"}},{"id":850776,"issuer":{"id":5724,"kind":"organization","name":"Orion Group Holdings Inc","symbol":"ORN"},"owners":[{"id":40159,"kind":"person","name":"SHANFELTER AUSTIN J","position":1,"cik":"0001221430","reported_name":"SHANFELTER AUSTIN J","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-03-10T21:42:42.000Z","date":"2026-03-10","kind":"sale","planned":false,"acquired":false,"shares":90000,"price":12.1713,"value":1095417.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $11.93 per share to $12.385 per share, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote."}],"balance_after":329215,"source":{"system":"sec-edgar","filing":"0001221430-26-000002","document":"form4-03102026_090339.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1402829/000122143026000002/form4-03102026_090339.xml","form_type":"4"}},{"id":1142415,"issuer":{"id":5724,"kind":"organization","name":"Orion Group Holdings Inc","symbol":"ORN"},"owners":[{"id":40159,"kind":"person","name":"SHANFELTER AUSTIN J","position":1,"cik":"0001221430","reported_name":"SHANFELTER AUSTIN J","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-05-19T21:00:08.000Z","date":"2025-05-16","kind":"sale","planned":false,"acquired":false,"shares":30000,"price":8.6663,"value":259989.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $8.64 per share to $8.71 per share, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote."}],"balance_after":419215,"source":{"system":"sec-edgar","filing":"0001415889-25-013653","document":"form4-05192025_050501.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1402829/000141588925013653/form4-05192025_050501.xml","form_type":"4"}},{"id":1142414,"issuer":{"id":5724,"kind":"organization","name":"Orion Group Holdings Inc","symbol":"ORN"},"owners":[{"id":40159,"kind":"person","name":"SHANFELTER AUSTIN J","position":1,"cik":"0001221430","reported_name":"SHANFELTER AUSTIN J","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-05-19T21:00:08.000Z","date":"2025-05-15","kind":"grant","planned":false,"acquired":true,"shares":11481,"price":8.71,"value":99999.51,"ownership":{"direct":true},"balance_after":449215,"source":{"system":"sec-edgar","filing":"0001415889-25-013653","document":"form4-05192025_050501.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1402829/000141588925013653/form4-05192025_050501.xml","form_type":"4"}},{"id":1508850,"issuer":{"id":5724,"kind":"organization","name":"Orion Group Holdings Inc","symbol":"ORN"},"owners":[{"id":40159,"kind":"person","name":"SHANFELTER AUSTIN J","position":1,"cik":"0001221430","reported_name":"SHANFELTER AUSTIN J","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2024-05-20T21:41:51.000Z","date":"2024-05-20","kind":"sale","planned":false,"acquired":false,"shares":40000,"price":9.0054,"value":360216.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $8.83 to $9.29, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote."}],"balance_after":437734,"source":{"system":"sec-edgar","filing":"0001415889-24-013800","document":"form4-05202024_090541.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1402829/000141588924013800/form4-05202024_090541.xml","form_type":"4"}},{"id":1508849,"issuer":{"id":5724,"kind":"organization","name":"Orion Group Holdings Inc","symbol":"ORN"},"owners":[{"id":40159,"kind":"person","name":"SHANFELTER AUSTIN J","position":1,"cik":"0001221430","reported_name":"SHANFELTER AUSTIN J","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common 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This amendment to the Form 4 is being filed to amend the second row in Table I, to reflect 60,970 shares of common stock withheld to satisfy tax withholding obligations, with respect to the foregoing transaction resulting in Mr. Shanfelter's current beneficial ownership of 492,948 shares. The first line of Table I and the first line of Table II remains unchanged."},{"field":"shares","element":"transactionShares","label":"F2","text":"Reflects a reduction of shares of time vested restricted stock units, withheld to cover taxes payable by the reporting person due to the March 1, 2023 vesting of the May 19, 2022 time vested restricted stock unit grant."}],"balance_after":492948,"source":{"system":"sec-edgar","filing":"0001567619-23-004646","document":"doc1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1402829/000156761923004646/doc1.xml","form_type":"4/A","original_submission_date":"2023-03-07"}},{"id":1965581,"issuer":{"id":5724,"kind":"organization","name":"Orion Group Holdings Inc","symbol":"ORN"},"owners":[{"id":40159,"kind":"person","name":"SHANFELTER AUSTIN J","position":1,"cik":"0001221430","reported_name":"SHANFELTER AUSTIN 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fulfilled his term as Executive Chairman."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"Represents Time Vested Restricted Stock Units that cliff vest and were to be settled at the time Mr. Shanfelter fulfilled his term as Executive Chairman."},{"field":"derivative.underlying","element":"underlyingSecurityTitle","label":"F1","text":"Vesting of time vested restricted stock units (awarded May 19, 2022) as a result of Mr. Shanfelter fulfilling his term as Executive Chairman on March 1, 2023."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":250896},"source":{"system":"sec-edgar","filing":"0001567619-23-004557","document":"doc1.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1402829/000156761923004557/doc1.xml","form_type":"4"}},{"id":1965580,"issuer":{"id":5724,"kind":"organization","name":"Orion Group Holdings 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This amendment to the Form 4 is being filed to amend the first row in Table 1, and to add a row in Table 2, with respect to the foregoing transaction. The second line of Table I remains unchanged , thus accurately reporting Mr. Shanfelter's current beneficial ownership of 303,922 shares in Column 5 of Table I."},{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"Represents Time Vested Restricted Stock Units that cliff vest and were to be settled at the time Mr. Shanfelter fulfilled his term as Interim Chief Executive Officer."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"Represents Time Vested Restricted Stock Units that cliff vest and were to be settled at the time Mr. Shanfelter fulfilled his term as Interim Chief Executive Officer."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"Represents Time Vested Restricted Stock Units that cliff vest and were to be settled at the time Mr. Shanfelter fulfilled his term as Interim Chief Executive Officer."},{"field":"derivative.underlying","element":"underlyingSecurityTitle","label":"F1","text":"On September 12, 2022, Mr. Shanfelter filed a Form 4 to report the vesting of 179,211 restricted stock units into shares of common stock and corresponding withholding of 40,054 shares of common stock to satisfy tax withholding obligations. This amendment to the Form 4 is being filed to amend the first row in Table 1, and to add a row in Table 2, with respect to the foregoing transaction. 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This amendment to the Form 4 is being filed to amend the first row in Table 1, and to add a row in Table 2, with respect to the foregoing transaction. The second line of Table I remains unchanged , thus accurately reporting Mr. Shanfelter's current beneficial ownership of 303,922 shares in Column 5 of Table I."},{"field":"shares","element":"transactionShares","label":"F2","text":"Vesting of time vested restricted stock units (awarded May 19, 2022) as a result of Mr. Shanfelter fulfilling his term as Interim Chief Executive Officer on September 12, 2022."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Vesting of time vested restricted stock units (awarded May 19, 2022) as a result of Mr. Shanfelter fulfilling his term as Interim Chief Executive Officer on September 12, 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