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The award was subject to service-based vesting conditions and vested on the date of the Company's 2023 annual meeting of stockholders, which occurred on June 22, 2023, subject to continued service through the applicable vesting date."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":1151},"source":{"system":"sec-edgar","filing":"0001628280-23-023439","document":"wk-form4_1687810107.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1606163/000162828023023439/wk-form4_1687810107.xml","form_type":"4"}},{"id":1844192,"issuer":{"id":5430,"kind":"organization","name":"Limbach Holdings, Inc.","symbol":"LMB"},"owners":[{"id":111912,"kind":"person","name":"Bacon Charles A. III","position":1,"cik":"0001679798","reported_name":"Bacon Charles A. 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The award is subject to service-based vesting conditions and will vest on the date of the Company's 2023 annual meeting of stockholders, to occur on or around June 22, 2023, subject to continued service through the applicable vesting date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"This award of RSUs was granted on May 1, 2023 in accordance with the Reporting Person's Transition Employment Agreement dated January 17, 2023. The award is subject to service-based vesting conditions and will vest on the date of the Company's 2023 annual meeting of stockholders, to occur on or around June 22, 2023, subject to continued service through the applicable vesting date."}],"balance_after":1151,"derivative":{"underlying":"Common Stock","underlying_shares":1151},"source":{"system":"sec-edgar","filing":"0001628280-23-018505","document":"wf-form4_168427431897479.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1606163/000162828023018505/wf-form4_168427431897479.xml","form_type":"4"}},{"id":1891494,"issuer":{"id":5430,"kind":"organization","name":"Limbach Holdings, Inc.","symbol":"LMB"},"owners":[{"id":111912,"kind":"person","name":"Bacon Charles A. III","position":1,"cik":"0001679798","reported_name":"Bacon Charles A. 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(the \"Company\"), any security holder of the Company, 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 range set forth in this footnote."}],"balance_after":402927,"source":{"system":"sec-edgar","filing":"0001628280-20-014052","document":"wf-form4_160150088518815.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1606163/000162828020014052/wf-form4_160150088518815.xml","form_type":"4"}},{"id":3037774,"issuer":{"id":5430,"kind":"organization","name":"Limbach Holdings, Inc.","symbol":"LMB"},"owners":[{"id":111912,"kind":"person","name":"Bacon Charles A. III","position":1,"cik":"0001679798","reported_name":"Bacon Charles A. 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(the \"Company\"), any security holder of the Company, 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 range set forth in this footnote."}],"balance_after":397664,"source":{"system":"sec-edgar","filing":"0001628280-20-013346","document":"wf-form4_159925621749657.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1606163/000162828020013346/wf-form4_159925621749657.xml","form_type":"4"}},{"id":3323150,"issuer":{"id":5430,"kind":"organization","name":"Limbach Holdings, Inc.","symbol":"LMB"},"owners":[{"id":111912,"kind":"person","name":"Bacon Charles A. III","position":1,"cik":"0001679798","reported_name":"Bacon Charles A. 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The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2021, January 1, 2022 and January 1, 2023, subject to continued employment through the applicable vesting date. The amounts reported above (related to this grant) do not include performance-based RSUs, if any, that may be earned by the reporting person but for which the Compensation Committee has not yet determined the achievement of the applicable performance goals. Any such RSUs will be reported on a Form 4 within two business days of the date of such determination."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"This award of RSUs was granted on 01/01/2020. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2021, January 1, 2022 and January 1, 2023, subject to continued employment through the applicable vesting date. The amounts reported above (related to this grant) do not include performance-based RSUs, if any, that may be earned by the reporting person but for which the Compensation Committee has not yet determined the achievement of the applicable performance goals. Any such RSUs will be reported on a Form 4 within two business days of the date of such determination."}],"balance_after":96668,"derivative":{"underlying":"Common Stock","underlying_shares":17500},"source":{"system":"sec-edgar","filing":"0001104659-20-000986","document":"tm1928451d5_4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1606163/000110465920000986/tm1928451d5_4.xml","form_type":"4"}},{"id":3323149,"issuer":{"id":5430,"kind":"organization","name":"Limbach Holdings, Inc.","symbol":"LMB"},"owners":[{"id":111912,"kind":"person","name":"Bacon Charles A. III","position":1,"cik":"0001679798","reported_name":"Bacon Charles A. 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The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2020, January 1, 2021 and January 1, 2022, subject to continued service through the applicable vesting date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"This award of RSUs was granted on 02/27/2019. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2020, January 1, 2021 and January 1, 2022, subject to continued service through the applicable vesting date."}],"balance_after":79168,"derivative":{"underlying":"Common Stock","underlying_shares":11666},"source":{"system":"sec-edgar","filing":"0001104659-20-000986","document":"tm1928451d5_4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1606163/000110465920000986/tm1928451d5_4.xml","form_type":"4"}},{"id":3323148,"issuer":{"id":5430,"kind":"organization","name":"Limbach Holdings, Inc.","symbol":"LMB"},"owners":[{"id":111912,"kind":"person","name":"Bacon Charles A. III","position":1,"cik":"0001679798","reported_name":"Bacon Charles A. 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The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2019, January 1, 2020 and January 1, 2021, subject to continued employment through the applicable vesting date. The amounts reported above (related to this grant) do not include performance-based RSUs, if any, that may be earned by the reporting person but for which the Compensation Committee has not yet determined the achievement of the applicable performance goals. Any such RSUs will be reported on a Form 4 within two business days of the date of such determination."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"This award of RSUs was granted on 04/13/2018. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2019, January 1, 2020 and January 1, 2021, subject to continued employment through the applicable vesting date. The amounts reported above (related to this grant) do not include performance-based RSUs, if any, that may be earned by the reporting person but for which the Compensation Committee has not yet determined the achievement of the applicable performance goals. Any such RSUs will be reported on a Form 4 within two business days of the date of such determination."}],"balance_after":90834,"derivative":{"underlying":"Common Stock","underlying_shares":5833},"source":{"system":"sec-edgar","filing":"0001104659-20-000986","document":"tm1928451d5_4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1606163/000110465920000986/tm1928451d5_4.xml","form_type":"4"}},{"id":3323147,"issuer":{"id":5430,"kind":"organization","name":"Limbach Holdings, Inc.","symbol":"LMB"},"owners":[{"id":111912,"kind":"person","name":"Bacon Charles A. III","position":1,"cik":"0001679798","reported_name":"Bacon Charles A. 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The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2018, January 1, 2019 and January 1, 2020, subject to continued employment through the applicable vesting date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"This award of RSUs was granted on 08/30/2017. 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Upon settlement of the 12/6/19 Purchase, the Reporting Person paid the Issuer $14,516.37, representing the full amount of the profit realized for Section 16 purpose in connection with the short-swing transactions."},{"field":"kind","element":"transactionCoding","label":"F2","text":"The purchase of 5,000 shares of the Issuer's common stock on December 10, 2019 is also matachable under Section 16(b) of the Securities Exchange Act of 1934, to the extent of 5,000 shares, with the Reporting Person's sale of 5,000 shares of the Issuer's common stock at a price of $4.75 per share on August 21, 2019. The Reporting Person has agreed to pay the Issuer, upon settlement of the purchases, $10,151.00, representing the full amount of the profit realized for Section 16 purposes in connection with the short-swing transaction, of which $9,989.36 was previously paid upon settlement of the 12/6/19 Purchase."}],"balance_after":362331,"source":{"system":"sec-edgar","filing":"0001104659-19-072203","document":"tm1925111d1_4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1606163/000110465919072203/tm1925111d1_4.xml","form_type":"4"}},{"id":3346655,"issuer":{"id":5430,"kind":"organization","name":"Limbach Holdings, Inc.","symbol":"LMB"},"owners":[{"id":111912,"kind":"person","name":"Bacon Charles A. III","position":1,"cik":"0001679798","reported_name":"Bacon Charles A. 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The Reporting Person has agreed to pay the Issuer, upon settlement of the sale, $14,516.37, representing the full amount of the profit realized in connection with the short-swing transaction."}],"balance_after":327331,"source":{"system":"sec-edgar","filing":"0001104659-19-071436","document":"tm1924830d5_4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1606163/000110465919071436/tm1924830d5_4.xml","form_type":"4"}},{"id":3346653,"issuer":{"id":5430,"kind":"organization","name":"Limbach Holdings, Inc.","symbol":"LMB"},"owners":[{"id":111912,"kind":"person","name":"Bacon Charles A. III","position":1,"cik":"0001679798","reported_name":"Bacon Charles A. 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The remaining 50% of the award will vest upon the achievement of a specified target share price of the Company's common stock on the Nasdaq Capital Market or other applicable principal securities exchange on which the Company's shares are then listed between August 1, 2018 and August 1, 2021, subject to continued employment from August 1, 2017 through the later of July 31, 2019 and the date on which the Compensation Committee of the Board of Directors certifies the achievement of the performance goal."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"This award of RSUs was granted on August 30, 2017. 50% of the award is subject to service-based vesting conditions and vests in equal installments on each of August 30, 2017, August 1, 2018 and August 1, 2019, subject to continued employment through the applicable vesting date. The remaining 50% of the award will vest upon the achievement of a specified target share price of the Company's common stock on the Nasdaq Capital Market or other applicable principal securities exchange on which the Company's shares are then listed between August 1, 2018 and August 1, 2021, subject to continued employment from August 1, 2017 through the later of July 31, 2019 and the date on which the Compensation Committee of the Board of Directors certifies the achievement of the performance goal."}],"balance_after":102501,"derivative":{"underlying":"Common Stock","underlying_shares":16666},"source":{"system":"sec-edgar","filing":"0001144204-19-037647","document":"tv526488_4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1606163/000114420419037647/tv526488_4.xml","form_type":"4"}},{"id":3447125,"issuer":{"id":5430,"kind":"organization","name":"Limbach Holdings, Inc.","symbol":"LMB"},"owners":[{"id":111912,"kind":"person","name":"Bacon Charles A. III","position":1,"cik":"0001679798","reported_name":"Bacon Charles A. 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III","position":1,"cik":"0001679798","reported_name":"Bacon Charles A. III","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Restricted Stock Units","published_at":"2019-03-02T02:34:56.000Z","date":"2019-02-27","kind":"grant","acquired":true,"shares":35000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each restricted stock unit (\"RSU\") represents a contingent right to receive one share of Limbach Holdings, Inc. common stock, exempt under Rule 16b-3(d)(1) & (3)."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"This award of RSUs was granted on 02/27/2019. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2020, January 1, 2021 and January 1, 2022, subject to continued service through the applicable vesting date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"This award of RSUs was granted on 02/27/2019. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2020, January 1, 2021 and January 1, 2022, subject to continued service through the applicable vesting date."}],"balance_after":119167,"derivative":{"underlying":"Common Stock","underlying_shares":35000},"source":{"system":"sec-edgar","filing":"0001144204-19-011765","document":"tv515300_4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1606163/000114420419011765/tv515300_4.xml","form_type":"4"}},{"id":3623175,"issuer":{"id":5430,"kind":"organization","name":"Limbach Holdings, Inc.","symbol":"LMB"},"owners":[{"id":111912,"kind":"person","name":"Bacon Charles A. III","position":1,"cik":"0001679798","reported_name":"Bacon Charles A. III","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Restricted Stock Units","published_at":"2019-03-02T02:34:56.000Z","date":"2018-01-01","kind":"exercise","acquired":false,"shares":5833,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each restricted stock unit (\"RSU\") represents a contingent right to receive one share of Limbach Holdings, Inc. (the \"Company\") common stock, exempt under Rule 16b-3."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"This award of RSUs was granted on 08/30/2017. The remaining RSUs vest equally on January 1, 2019 and January 1, 2020, subject to continued employment through the applicable vesting date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"This award of RSUs was granted on 08/30/2017. The remaining RSUs vest equally on January 1, 2019 and January 1, 2020, subject to continued employment through the applicable vesting date."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"This Form 4 is being amended to correct information previously reported on a Form 4 filed June 1, 2018 (the \"Initial Form 4\") regarding the number of derivative securities beneficially owned following the transactions relating to the vesting of 5,833 RSUs, which reporting also affected the reporting of the number of derivative securities beneficially owned on subsequent Forms 4."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"The Initial Form 4 inadvertently excluded 83,333 RSUs granted on August 30, 2017 (the \"August 2017 Award\") from the number of derivative securities beneficially owned following the transactions. The August 2017 Award includes 50,000 RSUs that will vest upon the achievement of a specified target share price of the Company's common stock on the Nasdaq Capital Market or other applicable principal securities exchange on which the Company's shares are then listed between August 1, 2018 and August 1, 2021, subject to continued employment from August 1, 2017 through the later of July 31, 2019 and the date on which the Compensation Committee of the Board of Directors certifies the achievement of the performance goal."}],"balance_after":95000,"derivative":{"underlying":"Common Stock","underlying_shares":5833},"source":{"system":"sec-edgar","filing":"0001144204-19-011764","document":"tv515299_4a.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1606163/000114420419011764/tv515299_4a.xml","form_type":"4/A","original_submission_date":"2018-06-01"}},{"id":3660433,"issuer":{"id":5430,"kind":"organization","name":"Limbach Holdings, Inc.","symbol":"LMB"},"owners":[{"id":111912,"kind":"person","name":"Bacon Charles A. III","position":1,"cik":"0001679798","reported_name":"Bacon Charles A. III","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2019-02-13T22:43:34.000Z","date":"2019-02-12","kind":"purchase","acquired":true,"shares":7390,"price":5.75,"value":42492.5,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported in this Form 4 were effected pursuant to a pre-established Rule 10b5-1 trading plan."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $5.68 to $5.85, inclusive."}],"balance_after":287925,"source":{"system":"sec-edgar","filing":"0001144204-19-007347","document":"tv513511_form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1606163/000114420419007347/tv513511_form4.xml","form_type":"4"}},{"id":3660432,"issuer":{"id":5430,"kind":"organization","name":"Limbach Holdings, Inc.","symbol":"LMB"},"owners":[{"id":111912,"kind":"person","name":"Bacon Charles A. III","position":1,"cik":"0001679798","reported_name":"Bacon Charles A. III","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2019-02-13T22:43:34.000Z","date":"2019-02-11","kind":"purchase","acquired":true,"shares":7000,"price":5.59,"value":39130.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported in this Form 4 were effected pursuant to a pre-established Rule 10b5-1 trading plan."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $5.30 to $5.75, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the U.S. Securities and Exchange Commission, upon request, full information regarding the number of shares of purchased at each separate price within the ranges set forth in footnotes (2) and (3) of this Form 4."}],"balance_after":280535,"source":{"system":"sec-edgar","filing":"0001144204-19-007347","document":"tv513511_form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1606163/000114420419007347/tv513511_form4.xml","form_type":"4"}},{"id":3665915,"issuer":{"id":5430,"kind":"organization","name":"Limbach Holdings, Inc.","symbol":"LMB"},"owners":[{"id":111912,"kind":"person","name":"Bacon Charles A. III","position":1,"cik":"0001679798","reported_name":"Bacon Charles A. III","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2019-02-11T22:18:02.000Z","date":"2019-02-08","kind":"purchase","acquired":true,"shares":10610,"price":5.78,"value":61325.8,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The transactions reported in this Form 4 were effected pursuant to a pre-established Rule 10b5-1 trading plan."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $5.45 to $6.00, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the U.S. Securities and Exchange Commission, upon request, full information regarding the number of shares of purchased at each separate price within the ranges set forth in this footnote (2)."}],"balance_after":273535,"source":{"system":"sec-edgar","filing":"0001144204-19-006301","document":"tv513083_form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1606163/000114420419006301/tv513083_form4.xml","form_type":"4"}},{"id":3708945,"issuer":{"id":5430,"kind":"organization","name":"Limbach Holdings, Inc.","symbol":"LMB"},"owners":[{"id":111912,"kind":"person","name":"Bacon Charles A. III","position":1,"cik":"0001679798","reported_name":"Bacon Charles A. 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The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2019, January 1, 2020 and January 1, 2021, subject to continued employment through the applicable vesting date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"This award of RSUs was granted on 04/13/2018. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2019, January 1, 2020 and January 1, 2021, subject to continued employment through the applicable vesting date."}],"balance_after":55000,"derivative":{"underlying":"Common Stock","underlying_shares":5833},"source":{"system":"sec-edgar","filing":"0001144204-19-000431","document":"tv510343_form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1606163/000114420419000431/tv510343_form4.xml","form_type":"4"}},{"id":3708944,"issuer":{"id":5430,"kind":"organization","name":"Limbach Holdings, Inc.","symbol":"LMB"},"owners":[{"id":111912,"kind":"person","name":"Bacon Charles A. III","position":1,"cik":"0001679798","reported_name":"Bacon Charles A. III","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Restricted Stock Units","published_at":"2019-01-03T22:01:43.000Z","date":"2019-01-01","kind":"exercise","acquired":false,"shares":5833,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each restricted stock unit (\"RSU\") represents a contingent right to receive one share of Limbach Holdings, Inc. common stock, exempt under Rule 16b-3(d)(1) & (3)."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"This award of RSUs was granted on 08/30/2017. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2018, January 1, 2019 and January 1, 2020, subject to continued employment through the applicable vesting date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"This award of RSUs was granted on 08/30/2017. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2018, January 1, 2019 and January 1, 2020, subject to continued employment through the applicable vesting date."}],"balance_after":60833,"derivative":{"underlying":"Common Stock","underlying_shares":5833},"source":{"system":"sec-edgar","filing":"0001144204-19-000431","document":"tv510343_form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1606163/000114420419000431/tv510343_form4.xml","form_type":"4"}},{"id":3708943,"issuer":{"id":5430,"kind":"organization","name":"Limbach Holdings, Inc.","symbol":"LMB"},"owners":[{"id":111912,"kind":"person","name":"Bacon Charles A. III","position":1,"cik":"0001679798","reported_name":"Bacon Charles A. III","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2019-01-03T22:01:43.000Z","date":"2019-01-01","kind":"exercise","acquired":true,"shares":5833,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each restricted stock unit (\"RSU\") represents a contingent right to receive one share of Limbach Holdings, Inc. common stock, exempt under Rule 16b-3(d)(1) & (3)."}],"balance_after":262925,"source":{"system":"sec-edgar","filing":"0001144204-19-000431","document":"tv510343_form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1606163/000114420419000431/tv510343_form4.xml","form_type":"4"}},{"id":3708942,"issuer":{"id":5430,"kind":"organization","name":"Limbach Holdings, Inc.","symbol":"LMB"},"owners":[{"id":111912,"kind":"person","name":"Bacon Charles A. III","position":1,"cik":"0001679798","reported_name":"Bacon Charles A. III","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2019-01-03T22:01:43.000Z","date":"2019-01-01","kind":"exercise","acquired":true,"shares":5833,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each restricted stock unit (\"RSU\") represents a contingent right to receive one share of Limbach Holdings, Inc. common stock, exempt under Rule 16b-3(d)(1) & (3)."}],"balance_after":257092,"source":{"system":"sec-edgar","filing":"0001144204-19-000431","document":"tv510343_form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1606163/000114420419000431/tv510343_form4.xml","form_type":"4"}},{"id":3809848,"issuer":{"id":5430,"kind":"organization","name":"Limbach Holdings, Inc.","symbol":"LMB"},"owners":[{"id":111912,"kind":"person","name":"Bacon Charles A. III","position":1,"cik":"0001679798","reported_name":"Bacon Charles A. III","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Restricted Stock Units","published_at":"2018-09-21T22:37:40.000Z","date":"2018-04-13","kind":"grant","acquired":true,"shares":17500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each restricted stock unit (\"RSU\") represents a contingent right to receive one share of Limbach Holdings, Inc. (the \"Company\") common stock, exempt under Rule 16b-3."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"This award of RSUs was granted on 04/13/2018. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2019, January 1, 2020 and January 1, 2021, subject to continued employment through the applicable vesting date. The amounts reported above (related to this grant) do not include performance-based RSUs, if any, that may be earned by the reporting person but for which the Compensation Committee has not yet determined the achievement of the applicable performance goals. Any such RSUs will be reported on a Form 4 within two business days of the date of such determination."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"This award of RSUs was granted on 04/13/2018. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2019, January 1, 2020 and January 1, 2021, subject to continued employment through the applicable vesting date. The amounts reported above (related to this grant) do not include performance-based RSUs, if any, that may be earned by the reporting person but for which the Compensation Committee has not yet determined the achievement of the applicable performance goals. Any such RSUs will be reported on a Form 4 within two business days of the date of such determination."}],"balance_after":17500,"derivative":{"underlying":"Common Stock","underlying_shares":17500},"source":{"system":"sec-edgar","filing":"0001144204-18-050428","document":"tv496110_form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1606163/000114420418050428/tv496110_form4.xml","form_type":"4"}},{"id":3853242,"issuer":{"id":5430,"kind":"organization","name":"Limbach Holdings, Inc.","symbol":"LMB"},"owners":[{"id":111912,"kind":"person","name":"Bacon Charles A. III","position":1,"cik":"0001679798","reported_name":"Bacon Charles A. III","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Restricted Stock Units","published_at":"2018-08-04T01:03:38.000Z","date":"2018-08-01","kind":"exercise","acquired":false,"shares":16667,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each restricted stock unit (\"RSU\") represents a contingent right to receive one share of Limbach Holdings, Inc. common stock, exempt under Rule 16b-3(d)(1) & (3)."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each restricted stock unit (\"RSU\") represents a contingent right to receive one share of Limbach Holdings, Inc. common stock, exempt under Rule 16b-3(d)(1) & (3)."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"This award of RSUs was granted on 08/30/2017. 50% of the award is subject to service-based vesting conditions and vests in equal installments on each of August 30, 2017, August 1, 2018 and August 1, 2019, subject to continued employment through the applicable vesting date. The remaining 50% of the award will vest upon the achievement of a specified target share price of the Company's common stock on the Nasdaq Capital Market or other applicable principal securities exchange on which the Company's shares are then listed between August 1, 2018 and August 1, 2021, subject to continued employment from August 1, 2017 through the later of July 31, 2019 and the date on which the Compensation Committee of the Board of Directors certifies the achievement of the performance goal."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"This award of RSUs was granted on 08/30/2017. 50% of the award is subject to service-based vesting conditions and vests in equal installments on each of August 30, 2017, August 1, 2018 and August 1, 2019, subject to continued employment through the applicable vesting date. The remaining 50% of the award will vest upon the achievement of a specified target share price of the Company's common stock on the Nasdaq Capital Market or other applicable principal securities exchange on which the Company's shares are then listed between August 1, 2018 and August 1, 2021, subject to continued employment from August 1, 2017 through the later of July 31, 2019 and the date on which the Compensation Committee of the Board of Directors certifies the achievement of the performance goal."}],"balance_after":66666,"derivative":{"underlying":"Common Stock","underlying_shares":16667},"source":{"system":"sec-edgar","filing":"0001144204-18-041997","document":"tv500177_4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1606163/000114420418041997/tv500177_4.xml","form_type":"4"}},{"id":3853241,"issuer":{"id":5430,"kind":"organization","name":"Limbach Holdings, Inc.","symbol":"LMB"},"owners":[{"id":111912,"kind":"person","name":"Bacon Charles A. 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III","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2018-08-04T01:03:38.000Z","date":"2018-08-01","kind":"exercise","acquired":true,"shares":16667,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each restricted stock unit (\"RSU\") represents a contingent right to receive one share of Limbach Holdings, Inc. common stock, exempt under Rule 16b-3(d)(1) & (3)."}],"balance_after":255532,"source":{"system":"sec-edgar","filing":"0001144204-18-041997","document":"tv500177_4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1606163/000114420418041997/tv500177_4.xml","form_type":"4"}},{"id":3910797,"issuer":{"id":5430,"kind":"organization","name":"Limbach Holdings, Inc.","symbol":"LMB"},"owners":[{"id":111912,"kind":"person","name":"Bacon Charles A. III","position":1,"cik":"0001679798","reported_name":"Bacon Charles A. III","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Restricted Stock Units","published_at":"2018-06-01T22:53:59.000Z","date":"2018-01-01","kind":"exercise","acquired":false,"shares":5833,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each restricted stock unit (\"RSU\") represents a contingent right to receive one share of Limbach Holdings, Inc. (the \"Company\") common stock, exempt under Rule 16b-3."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"This award of RSUs was granted on 08/30/2017. The remaining RSUs vest equally on January 1, 2019 and January 1, 2020, subject to continued employment through the applicable vesting date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"This award of RSUs was granted on 08/30/2017. The remaining RSUs vest equally on January 1, 2019 and January 1, 2020, subject to continued employment through the applicable vesting date."}],"balance_after":11667,"derivative":{"underlying":"Common Stock","underlying_shares":5833},"source":{"system":"sec-edgar","filing":"0001144204-18-032499","document":"tv495734_form4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1606163/000114420418032499/tv495734_form4.xml","form_type":"4"}},{"id":3910796,"issuer":{"id":5430,"kind":"organization","name":"Limbach Holdings, Inc.","symbol":"LMB"},"owners":[{"id":111912,"kind":"person","name":"Bacon Charles A. III","position":1,"cik":"0001679798","reported_name":"Bacon Charles A. III","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2018-06-01T22:53:59.000Z","date":"2018-03-01","kind":"tax_withholding","acquired":false,"shares":1612,"price":11.84,"value":19086.08,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F3","text":"Shares withheld by the Company to satisfy minimum tax withholding requirements."}],"balance_after":238865,"source":{"system":"sec-edgar","filing":"0001144204-18-032499","document":"tv495734_form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1606163/000114420418032499/tv495734_form4.xml","form_type":"4"}},{"id":3910795,"issuer":{"id":5430,"kind":"organization","name":"Limbach Holdings, Inc.","symbol":"LMB"},"owners":[{"id":111912,"kind":"person","name":"Bacon Charles A. III","position":1,"cik":"0001679798","reported_name":"Bacon Charles A. III","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2018-06-01T22:53:59.000Z","date":"2018-01-01","kind":"exercise","acquired":true,"shares":5833,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Each restricted stock unit (\"RSU\") represents a contingent right to receive one share of Limbach Holdings, Inc. (the \"Company\") common stock, exempt under Rule 16b-3."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The reporting person initially filed a Form 4 on September 1, 2017 (the \"Initial Form 4\") reporting the award of 100,000 RSUs granted on 08/30/2017. Fifty percent (50%) of this RSU award was granted subject to service-based vesting conditions and vests in equal installments on each of August 30, 2017, August 1, 2018 and August 1, 2019, subject to continued employment through the applicable vesting date.  The remaining fifty percent (50%) of the award is subject to performance-based vesting conditions disclosed in the Initial Form 4.  The Initial Form 4 inadvertently omitted 16,667 shares of common stock from Table I, which is related to the portion of the RSUs that vested on August 30, 2017.  This Form 4 correctly includes those 16,667 shares in Box 5 to Table I of this filing, in addition to the vesting of the RSUs disclosed in Line 1 to Table I."}],"balance_after":240477,"source":{"system":"sec-edgar","filing":"0001144204-18-032499","document":"tv495734_form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1606163/000114420418032499/tv495734_form4.xml","form_type":"4"}}]}