LMB

SEC source: 0001628280-25-012404 · wk-form4_1741814027.xml · nonDerivative · entry 2

McCann Michael M · CIK 0001760470 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 128,605

F2 · shares: Reflects the withholding of 19,443 shares by the Company to satisfy tax withholding requirements. Such transaction was exempt from Section 16(b) pursuant to Rule 16b-3.

SEC source: 0001628280-25-012404 · wk-form4_1741814027.xml · nonDerivative · entry 1

McCann Michael M · CIK 0001760470 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 148,048

F1 · shares: Represents 49,408 shares of Limbach Holdings, Inc. (the "Company") common stock issued to the reporting person on March 10, 2025 upon vesting of 32,939 performance-based restricted stock units, based on the achievement of certain pre-established performance goals at above-target levels for the performance period commencing on January 1, 2022 through December 31, 2024. Such transaction was exempt from Section 16(b) pursuant to Rule 16b-3.

SEC source: 0001628280-25-012405 · wk-form4_1741814037.xml · nonDerivative · entry 2

Brooks Jayme L. · CIK 0001447591 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 122,102

F2 · shares: Reflects the withholding of 12,860 shares by the Company to satisfy tax withholding requirements. Such transaction was exempt from Section 16(b) pursuant to Rule 16b-3.

SEC source: 0001628280-25-012405 · wk-form4_1741814037.xml · nonDerivative · entry 1

Brooks Jayme L. · CIK 0001447591 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 134,962

F1 · shares: Represents 32,680 shares of Limbach Holdings, Inc. (the "Company") common stock issued to the reporting person on March 10, 2025 upon vesting of 21,787 performance-based restricted stock units, based on the achievement of certain pre-established performance goals at above-target levels for the performance period commencing on January 1, 2022 through December 31, 2024. Such transaction was exempt from Section 16(b) pursuant to Rule 16b-3.

SEC source: 0001628280-25-012403 · wk-form4_1741814018.xml · nonDerivative · entry 2

Sharp Jay · CIK 0001965562 · Regional President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 71,877

F3 · shares: Reflects the withholding of 9,252 shares by the Company to satisfy tax withholding requirements. Such transaction was exempt from Section 16(b) pursuant to Rule 16b-3.

SEC source: 0001628280-25-012403 · wk-form4_1741814018.xml · nonDerivative · entry 1

Sharp Jay · CIK 0001965562 · Regional President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 81,129

F1 · shares: Represents 20,710 shares of Limbach Holdings, Inc. (the "Company") common stock issued to the reporting person on March 10, 2025 upon vesting of 13,807 performance-based restricted stock units, based on the achievement of certain pre-established performance goals at above-target levels for the performance period commencing on January 1, 2022 through December 31, 2024. Such transaction was exempt from Section 16(b) pursuant to Rule 16b-3.

F2 · balance_after: The amount of common stock also contains awards of restricted stock units (each, an "RSU") granted on January 4, 2023 and January 17, 2023. Each RSU represents a contingent right to receive one share of the Company's common stock, exempt under Rule 16b-3(d)(1) and (3). Each award is subject to service-based vesting conditions. The awards vest, in the aggregate, in the amount of 3,194 shares on January 1, 2026. The amount of common stock does 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 achievements of the applicable performance goals. Any such performance-based RSU's will be reported on a Form 4 within two business days of the date of such determination.

SEC source: 0001628280-25-012402 · wk-form4_1741814007.xml · nonDerivative · entry 2

Angerosa Nicholas · CIK 0001965575 · Regional President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 54,350

F3 · shares: Reflects the withholding of 6,615 shares by the Company to satisfy tax withholding requirements. Such transaction was exempt from Section 16(b) pursuant to Rule 16b-3.

SEC source: 0001628280-25-012402 · wk-form4_1741814007.xml · nonDerivative · entry 1

Angerosa Nicholas · CIK 0001965575 · Regional President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 60,965

F1 · shares: Represents 18,343 shares of Limbach Holdings, Inc. (the "Company") common stock issued to the reporting person on March 10, 2025 upon vesting of 12,229 performance-based restricted stock units, based on the achievement of certain pre-established performance goals at above-target levels for the performance period commencing on January 1, 2022 through December 31, 2024. Such transaction was exempt from Section 16(b) pursuant to Rule 16b-3.

F2 · balance_after: The amount of common stock contains awards of restricted stock units (each, an "RSU") granted on January 4, 2023, and January 17, 2023. Each RSU represents a contingent right to receive one share of the Company's common stock, exempt under Rule 16b-3(d)(1) and (3). Each award is subject to service-based vesting conditions. The awards vest, in the aggregate, in the amount of 2,507 shares on January 1, 2026. The amount of common stock does 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 achievements of the applicable performance goals. Any such performance-based RSU's will be reported on a Form 4 within two business days of the date of such determination.

SEC source: 0001628280-25-000366 · wk-form4_1735942034.xml · derivative · entry 3

ALVARADO LINDA G · CIK 0001122788 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 956

Underlying: Common Stock · 956 shares

Expires not disclosed

F1 · derivative.exercise_price: 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.

F3 · derivative.exercise_date: This award of RSUs was granted on January 1, 2025. The RSUs are scheduled to cliff vest on January 1, 2026.

F3 · derivative.expiration_date: This award of RSUs was granted on January 1, 2025. The RSUs are scheduled to cliff vest on January 1, 2026.

SEC source: 0001628280-25-000366 · wk-form4_1735942034.xml · derivative · entry 2

ALVARADO LINDA G · CIK 0001122788 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 1,914 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: 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.

F2 · derivative.exercise_date: This award of RSUs was granted on January 1, 2024. The RSUs cliff vested on January 1, 2025.

F2 · derivative.expiration_date: This award of RSUs was granted on January 1, 2024. The RSUs cliff vested on January 1, 2025.

SEC source: 0001628280-25-000366 · wk-form4_1735942034.xml · nonDerivative · entry 1

ALVARADO LINDA G · CIK 0001122788 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 29,204

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001628280-25-000372 · wk-form4_1735942086.xml · derivative · entry 3

Gaboury David Richard · CIK 0002026309 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 956

Underlying: Common Stock · 956 shares

Expires not disclosed

F1 · derivative.exercise_price: 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.

F3 · derivative.exercise_date: This award of RSUs was granted on January 1, 2025. The RSUs are scheduled to cliff vest on January 1, 2026.

F3 · derivative.expiration_date: This award of RSUs was granted on January 1, 2025. The RSUs are scheduled to cliff vest on January 1, 2026.

SEC source: 0001628280-25-000372 · wk-form4_1735942086.xml · derivative · entry 2

Gaboury David Richard · CIK 0002026309 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 826 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: 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.

F2 · derivative.exercise_date: This award of RSUs was granted on June 13, 2024. The award was subject to service-based vesting conditions and vested on January 1, 2025.

F2 · derivative.expiration_date: This award of RSUs was granted on June 13, 2024. The award was subject to service-based vesting conditions and vested on January 1, 2025.

SEC source: 0001628280-25-000372 · wk-form4_1735942086.xml · nonDerivative · entry 1

Gaboury David Richard · CIK 0002026309 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,897

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001628280-25-000368 · wk-form4_1735942055.xml · derivative · entry 11

McCann Michael M · CIK 0001760470 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,532

Underlying: Common Stock · 4,498 shares

Expires not disclosed

F3 · derivative.exercise_price: 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) and (3).

F8 · derivative.exercise_date: This award of RSUs was granted on January 1, 2025. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2026, January 1, 2027 and January 1, 2028, 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 RSU's will be reported on a Form 4 within two business days of the date of such determination.

F8 · derivative.expiration_date: This award of RSUs was granted on January 1, 2025. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2026, January 1, 2027 and January 1, 2028, 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 RSU's will be reported on a Form 4 within two business days of the date of such determination.

SEC source: 0001628280-25-000368 · wk-form4_1735942055.xml · derivative · entry 10

McCann Michael M · CIK 0001760470 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,034

Underlying: Common Stock · 2,627 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: 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) and (3).

F7 · derivative.exercise_date: This award of RSUs was granted on January 1, 2024. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2025, January 1, 2026 and January 1, 2027, 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 RSU's will be reported on a Form 4 within two business days of the date of such determination.

F7 · derivative.expiration_date: This award of RSUs was granted on January 1, 2024. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2025, January 1, 2026 and January 1, 2027, 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 RSU's will be reported on a Form 4 within two business days of the date of such determination.

SEC source: 0001628280-25-000368 · wk-form4_1735942055.xml · derivative · entry 9

McCann Michael M · CIK 0001760470 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,661

Underlying: Common Stock · 1,080 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: 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) and (3).

F6 · derivative.exercise_date: This award of RSUs was granted on January 17, 2023. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2024, January 1, 2025 and January 1, 2026, 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 RSU's will be reported on a Form 4 within two business days of the date of such determination.

F6 · derivative.expiration_date: This award of RSUs was granted on January 17, 2023. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2024, January 1, 2025 and January 1, 2026, 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 RSU's will be reported on a Form 4 within two business days of the date of such determination.

SEC source: 0001628280-25-000368 · wk-form4_1735942055.xml · derivative · entry 8

McCann Michael M · CIK 0001760470 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,741

Underlying: Common Stock · 4,699 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: 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) and (3).

F5 · derivative.exercise_date: This award of RSUs was granted on January 4, 2023. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2024, January 1, 2025 and January 1, 2026, 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 RSU's will be reported on a Form 4 within two business days of the date of such determination.

F5 · derivative.expiration_date: This award of RSUs was granted on January 4, 2023. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2024, January 1, 2025 and January 1, 2026, 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 RSU's will be reported on a Form 4 within two business days of the date of such determination.

SEC source: 0001628280-25-000368 · wk-form4_1735942055.xml · derivative · entry 7

McCann Michael M · CIK 0001760470 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 19,440

Underlying: Common Stock · 5,490 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: 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) and (3).

F4 · derivative.exercise_date: This award of RSUs was granted on January 1, 2022. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2023, January 1, 2024 and January 1, 2025, 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 RSU's will be reported on a Form 4 within two business days of the date of such determination.

F4 · derivative.expiration_date: This award of RSUs was granted on January 1, 2022. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2023, January 1, 2024 and January 1, 2025, 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 RSU's will be reported on a Form 4 within two business days of the date of such determination.

SEC source: 0001628280-25-000368 · wk-form4_1735942055.xml · nonDerivative · entry 5

McCann Michael M · CIK 0001760470 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 98,640

F1 · shares: Reflects the withholding of shares by Limbach Holdings, Inc. (the "Company") to satisfy tax withholding requirements. Such transaction was exempt from Section 16(b) pursuant to Rule 16b-3.

SEC source: 0001628280-25-000368 · wk-form4_1735942055.xml · nonDerivative · entry 4

McCann Michael M · CIK 0001760470 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 102,463

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001628280-25-000368 · wk-form4_1735942055.xml · nonDerivative · entry 3

McCann Michael M · CIK 0001760470 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 99,836

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001628280-25-000368 · wk-form4_1735942055.xml · nonDerivative · entry 2

McCann Michael M · CIK 0001760470 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 98,756

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001628280-25-000368 · wk-form4_1735942055.xml · nonDerivative · entry 1

McCann Michael M · CIK 0001760470 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 94,057

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001628280-25-000362 · wk-form4_1735942003.xml · derivative · entry 3

McNally Michael F · CIK 0001667559 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 956

Underlying: Common Stock · 956 shares

Expires not disclosed

F1 · derivative.exercise_price: 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.

F3 · derivative.exercise_date: This award of RSUs was granted on January 1, 2025. The RSUs are scheduled to cliff vest on January 1, 2026.

F3 · derivative.expiration_date: This award of RSUs was granted on January 1, 2025. The RSUs are scheduled to cliff vest on January 1, 2026.

SEC source: 0001628280-25-000362 · wk-form4_1735942003.xml · derivative · entry 2

McNally Michael F · CIK 0001667559 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 1,914 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: 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.

F2 · derivative.exercise_date: This award of RSUs was granted on January 1, 2024. The RSUs cliff vested on January 1, 2025.

F2 · derivative.expiration_date: This award of RSUs was granted on January 1, 2024. The RSUs cliff vested on January 1, 2025.

SEC source: 0001628280-25-000362 · wk-form4_1735942003.xml · nonDerivative · entry 1

McNally Michael F · CIK 0001667559 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 58,423

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001628280-25-000367 · wk-form4_1735942044.xml · derivative · entry 4

Horowitz Joshua · CIK 0001612424 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 956

Underlying: Common Stock · 956 shares

Expires not disclosed

F2 · derivative.exercise_price: 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.

F4 · derivative.exercise_date: This award of RSUs was granted on January 1, 2025. The RSUs are scheduled to cliff vest on January 1, 2026.

F4 · derivative.expiration_date: This award of RSUs was granted on January 1, 2025. The RSUs are scheduled to cliff vest on January 1, 2026.

SEC source: 0001628280-25-000367 · wk-form4_1735942044.xml · derivative · entry 3

Horowitz Joshua · CIK 0001612424 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 1,914 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: 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.

F3 · derivative.exercise_date: This award of RSUs was granted on January 1, 2024. The RSUs cliff vested on January 1, 2025.

F3 · derivative.expiration_date: This award of RSUs was granted on January 1, 2024. The RSUs cliff vested on January 1, 2025.

SEC source: 0001628280-25-000367 · wk-form4_1735942044.xml · nonDerivative · entry 1

Horowitz Joshua · CIK 0001612424 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 41,829

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001628280-25-000371 · wk-form4_1735942076.xml · derivative · entry 5

Angerosa Nicholas · CIK 0001965575 · Regional President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,790

Underlying: Common Stock · 1,248 shares

Expires not disclosed

F4 · derivative.exercise_price: Each RSU represents a contingent right to receive one share of the Company's common stock, exempt under Rule 16b-3(d)(1) and (3).

F6 · derivative.exercise_date: This award of RSUs was granted on January 1, 2025. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2026, January 1, 2027 and January 1, 2028, 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 RSU's will be reported on a Form 4 within two business days of the date of such determination.

F6 · derivative.expiration_date: This award of RSUs was granted on January 1, 2025. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2026, January 1, 2027 and January 1, 2028, 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 RSU's will be reported on a Form 4 within two business days of the date of such determination.

SEC source: 0001628280-25-000371 · wk-form4_1735942076.xml · derivative · entry 4

Angerosa Nicholas · CIK 0001965575 · Regional President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,542

Underlying: Common Stock · 770 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · derivative.exercise_price: Each RSU represents a contingent right to receive one share of the Company's common stock, exempt under Rule 16b-3(d)(1) and (3).

F5 · derivative.exercise_date: This award of RSUs was granted on January 1, 2024. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2025, January 1, 2026 and January 1, 2027, 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 RSU's will be reported on a Form 4 within two business days of the date of such determination.

F5 · derivative.expiration_date: This award of RSUs was granted on January 1, 2024. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2025, January 1, 2026 and January 1, 2027, 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 RSU's will be reported on a Form 4 within two business days of the date of such determination.

SEC source: 0001628280-25-000371 · wk-form4_1735942076.xml · nonDerivative · entry 3

Angerosa Nicholas · CIK 0001965575 · Regional President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 42,622

F3 · shares: Reflects the withholding of shares by the Company to satisfy tax withholding requirements. Such transaction was exempt from Section 16(b) pursuant to Rule 16b-3.

SEC source: 0001628280-25-000371 · wk-form4_1735942076.xml · nonDerivative · entry 2

Angerosa Nicholas · CIK 0001965575 · Regional President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 44,821

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001628280-25-000365 · wk-form4_1735942023.xml · derivative · entry 3

Krzeminski Laurel J · CIK 0001493187 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 956

Underlying: Common Stock · 956 shares

Expires not disclosed

F1 · derivative.exercise_price: 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.

F3 · derivative.exercise_date: This award of RSUs was granted on January 1, 2025. The RSUs are scheduled to cliff vest on January 1, 2026.

F3 · derivative.expiration_date: This award of RSUs was granted on January 1, 2025. The RSUs are scheduled to cliff vest on January 1, 2026.

SEC source: 0001628280-25-000365 · wk-form4_1735942023.xml · derivative · entry 2

Krzeminski Laurel J · CIK 0001493187 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 1,914 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: 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.

F2 · derivative.exercise_date: This award of RSUs was granted on January 1, 2024. The RSUs cliff vested on January 1, 2025.

F2 · derivative.expiration_date: This award of RSUs was granted on January 1, 2024. The RSUs cliff vested on January 1, 2025.

SEC source: 0001628280-25-000365 · wk-form4_1735942023.xml · nonDerivative · entry 1

Krzeminski Laurel J · CIK 0001493187 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 35,496

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001628280-25-000369 · wk-form4_1735942065.xml · derivative · entry 5

Sharp Jay · CIK 0001965562 · Regional President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,319

Underlying: Common Stock · 1,461 shares

Expires not disclosed

F4 · derivative.exercise_price: Each RSU represents a contingent right to receive one share of the Company's common stock, exempt under Rule 16b-3(d)(1) and (3).

F6 · derivative.exercise_date: This award of RSUs was granted on January 1, 2025. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2026, January 1, 2027 and January 1, 2028, 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 RSU's will be reported on a Form 4 within two business days of the date of such determination.

F6 · derivative.expiration_date: This award of RSUs was granted on January 1, 2025. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2026, January 1, 2027 and January 1, 2028, 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 RSU's will be reported on a Form 4 within two business days of the date of such determination.

SEC source: 0001628280-25-000369 · wk-form4_1735942065.xml · derivative · entry 4

Sharp Jay · CIK 0001965562 · Regional President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,858

Underlying: Common Stock · 928 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · derivative.exercise_price: Each RSU represents a contingent right to receive one share of the Company's common stock, exempt under Rule 16b-3(d)(1) and (3).

F5 · derivative.exercise_date: This award of RSUs was granted on January 1, 2024. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2025, January 1, 2026 and January 1, 2027, 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 RSU's will be reported on a Form 4 within two business days of the date of such determination.

F5 · derivative.expiration_date: This award of RSUs was granted on January 1, 2024. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2025, January 1, 2026 and January 1, 2027, 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 RSU's will be reported on a Form 4 within two business days of the date of such determination.

SEC source: 0001628280-25-000369 · wk-form4_1735942065.xml · nonDerivative · entry 3

Sharp Jay · CIK 0001965562 · Regional President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 60,419

F3 · shares: Reflects the withholding of shares by the Company to satisfy tax withholding requirements. Such transaction was exempt from Section 16(b) pursuant to Rule 16b-3.

SEC source: 0001628280-25-000369 · wk-form4_1735942065.xml · nonDerivative · entry 2

Sharp Jay · CIK 0001965562 · Regional President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 62,477

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001628280-25-000363 · wk-form4_1735942013.xml · derivative · entry 5

PRATT GORDON G · CIK 0001409889 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 956

Underlying: Common Stock · 956 shares

Expires not disclosed

F3 · derivative.exercise_price: 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.

F5 · derivative.exercise_date: This award of RSUs was granted on January 1, 2025. The RSUs are scheduled to cliff vest on January 1, 2026.

F5 · derivative.expiration_date: This award of RSUs was granted on January 1, 2025. The RSUs are scheduled to cliff vest on January 1, 2026.

SEC source: 0001628280-25-000363 · wk-form4_1735942013.xml · derivative · entry 4

PRATT GORDON G · CIK 0001409889 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 1,914 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: 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.

F4 · derivative.exercise_date: This award of RSUs was granted on January 1, 2024. The RSUs cliff vested on January 1, 2025.

F4 · derivative.expiration_date: This award of RSUs was granted on January 1, 2024. The RSUs cliff vested on January 1, 2025.

SEC source: 0001628280-25-000363 · wk-form4_1735942013.xml · nonDerivative · entry 1

PRATT GORDON G · CIK 0001409889 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 43,696

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001628280-25-000360 · wk-form4_1735941992.xml · derivative · entry 11

Brooks Jayme L. · CIK 0001447591 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 9,042

Underlying: Common Stock · 1,972 shares

Expires not disclosed

F3 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Company's common stock, exempt under Rule 16b-3(d)(1) and (3).

F8 · derivative.exercise_date: This award of RSUs was granted on January 1, 2025. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2026, January 1, 2027 and January 1, 2028, 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 RSU's will be reported on a Form 4 within two business days of the date of such determination.

F8 · derivative.expiration_date: This award of RSUs was granted on January 1, 2025. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2026, January 1, 2027 and January 1, 2028, 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 RSU's will be reported on a Form 4 within two business days of the date of such determination.

SEC source: 0001628280-25-000360 · wk-form4_1735941992.xml · derivative · entry 10

Brooks Jayme L. · CIK 0001447591 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,070

Underlying: Common Stock · 1,266 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Company's common stock, exempt under Rule 16b-3(d)(1) and (3).

F7 · derivative.exercise_date: This award of RSUs was granted on January 1, 2024. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2025, January 1, 2026 and January 1, 2027, 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 RSU's will be reported on a Form 4 within two business days of the date of such determination.

F7 · derivative.expiration_date: This award of RSUs was granted on January 1, 2024. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2025, January 1, 2026 and January 1, 2027, 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 RSU's will be reported on a Form 4 within two business days of the date of such determination.

SEC source: 0001628280-25-000360 · wk-form4_1735941992.xml · derivative · entry 9

Brooks Jayme L. · CIK 0001447591 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,336

Underlying: Common Stock · 97 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Company's common stock, exempt under Rule 16b-3(d)(1) and (3).

F6 · derivative.exercise_date: This award of RSUs was granted on June 30, 2023. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2024, January 1, 2025 and January 1, 2026, subject to continued employment through the applicable vesting date.

F6 · derivative.expiration_date: This award of RSUs was granted on June 30, 2023. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2024, January 1, 2025 and January 1, 2026, subject to continued employment through the applicable vesting date.

SEC source: 0001628280-25-000360 · wk-form4_1735941992.xml · derivative · entry 8

Brooks Jayme L. · CIK 0001447591 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,433

Underlying: Common Stock · 4,440 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Company's common stock, exempt under Rule 16b-3(d)(1) and (3).

F5 · derivative.exercise_date: This award of RSUs was granted on January 4, 2023. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2024, January 1, 2025 and January 1, 2026, 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 RSU's will be reported on a Form 4 within two business days of the date of such determination.

F5 · derivative.expiration_date: This award of RSUs was granted on January 4, 2023. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2024, January 1, 2025 and January 1, 2026, 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 RSU's will be reported on a Form 4 within two business days of the date of such determination.

SEC source: 0001628280-25-000360 · wk-form4_1735941992.xml · derivative · entry 7

Brooks Jayme L. · CIK 0001447591 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,873

Underlying: Common Stock · 3,631 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Company's common stock, exempt under Rule 16b-3(d)(1) and (3).

F4 · derivative.exercise_date: This award of RSUs was granted on January 1, 2022. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2023, January 1, 2024 and January 1, 2025, 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 RSU's will be reported on a Form 4 within two business days of the date of such determination.

F4 · derivative.expiration_date: This award of RSUs was granted on January 1, 2022. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2023, January 1, 2024 and January 1, 2025, 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 RSU's will be reported on a Form 4 within two business days of the date of such determination.

SEC source: 0001628280-25-000360 · wk-form4_1735941992.xml · nonDerivative · entry 5

Brooks Jayme L. · CIK 0001447591 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 102,282

F1 · shares: Reflects the withholding of shares by Limbach Holdings, Inc. (the "Company") to satisfy tax withholding requirements. Such transactions were exempt from Section 16(b) pursuant to Rule 16b-3.