Sharp Jay

SEC source: 0001628280-26-062492 · wk-form4_1789675631.xml · nonDerivative · entry 1

Sharp Jay · CIK 0001965562 · Executive Vice President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 67,642

F1 · shares: This transaction is part of a 10b5-1 plan adopted on March 14, 2026 by the reporting person.

SEC source: 0001628280-26-043880 · wk-form4_1781727048.xml · nonDerivative · entry 5

Sharp Jay · CIK 0001965562 · Executive Vice President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 72,736

F5 · shares: Represents a bona fide gift of shares of Limbach Holdings, Inc's. common stock for which no payment or consideration was received by the reporting person.

SEC source: 0001628280-26-043880 · wk-form4_1781727048.xml · nonDerivative · entry 4

Sharp Jay · CIK 0001965562 · Executive Vice President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 73,456

F1 · shares: This transaction is part of a 10b5-1 plan adopted on March 14, 2026 by the reporting person.

SEC source: 0001628280-26-043880 · wk-form4_1781727048.xml · nonDerivative · entry 3

Sharp Jay · CIK 0001965562 · Executive Vice President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 73,656

F1 · shares: This transaction is part of a 10b5-1 plan adopted on March 14, 2026 by the reporting person.

F4 · price: This transaction was executed in multiple trades at prices ranging from $80.07 to $80.84. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide to 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 sold at each separate price.

SEC source: 0001628280-26-043880 · wk-form4_1781727048.xml · nonDerivative · entry 2

Sharp Jay · CIK 0001965562 · Executive Vice President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 75,677

F1 · shares: This transaction is part of a 10b5-1 plan adopted on March 14, 2026 by the reporting person.

F3 · price: This transaction was executed in multiple trades at prices ranging from $79.05 to $80.04. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide to 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 sold at each separate price.

SEC source: 0001628280-26-043880 · wk-form4_1781727048.xml · nonDerivative · entry 1

Sharp Jay · CIK 0001965562 · Executive Vice President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 77,539

F1 · shares: This transaction is part of a 10b5-1 plan adopted on March 14, 2026 by the reporting person.

F2 · price: This transaction was executed in multiple trades at prices ranging from $78.03 to $79.02. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide to 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 sold at each separate price.

SEC source: 0001628280-26-019541 · wk-form4_1773870604.xml · nonDerivative · entry 5

Sharp Jay · CIK 0001965562 · Executive Vice President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 78,327

F6 · shares: Represents a bona fide gift of shares of Limbach Holdings, Inc's. common stock for which no payment or consideration was received by the reporting person.

SEC source: 0001628280-26-019541 · wk-form4_1773870604.xml · nonDerivative · entry 4

Sharp Jay · CIK 0001965562 · Executive Vice President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 79,027

F1 · shares: This transaction is part of a 10b5-1 plan adopted on March 14, 2025 by the reporting person.

F5 · price: This transaction was executed in multiple trades at prices ranging from $81.30 to $81.72. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide to 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 sold at each separate price.

SEC source: 0001628280-26-019541 · wk-form4_1773870604.xml · nonDerivative · entry 3

Sharp Jay · CIK 0001965562 · Executive Vice President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 79,527

F1 · shares: This transaction is part of a 10b5-1 plan adopted on March 14, 2025 by the reporting person.

F4 · price: This transaction was executed in multiple trades at prices ranging from $80.03 to $80.96. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide to 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 sold at each separate price.

SEC source: 0001628280-26-019541 · wk-form4_1773870604.xml · nonDerivative · entry 2

Sharp Jay · CIK 0001965562 · Executive Vice President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 79,827

F1 · shares: This transaction is part of a 10b5-1 plan adopted on March 14, 2025 by the reporting person.

F3 · price: This transaction was executed in multiple trades at prices ranging from $79.00 to $79.87. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide to 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 sold at each separate price.

SEC source: 0001628280-26-019541 · wk-form4_1773870604.xml · nonDerivative · entry 1

Sharp Jay · CIK 0001965562 · Executive Vice President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 80,536

F1 · shares: This transaction is part of a 10b5-1 plan adopted on March 14, 2025 by the reporting person.

F2 · price: This transaction was executed in multiple trades at prices ranging from $78.00 to $78.98. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide to 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 sold at each separate price.

SEC source: 0001628280-26-014726 · wk-form4_1772662465.xml · nonDerivative · entry 2

Sharp Jay · CIK 0001965562 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 81,027

F2 · shares: Reflects the withholding of 12,359 shares by the Company to satisfy tax withholding requirements. Such transaction was exempt from Section 16(b) pursuant to Rule 16b-3.

SEC source: 0001628280-26-014726 · wk-form4_1772662465.xml · nonDerivative · entry 1

Sharp Jay · CIK 0001965562 · Executive Vice President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 93,386

F1 · shares: Represents 28,747 shares of Limbach Holdings, Inc. (the "Company") common stock issued to the reporting person on March 2, 2026 upon vesting of 19,165 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, 2023 through December 31, 2025. Such transaction was exempt from Section 16(b) pursuant to Rule 16b-3.

SEC source: 0001628280-26-000543 · wk-form4_1767649794.xml · derivative · entry 7

Sharp Jay · CIK 0001965562 · Regional President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,581

Underlying: Common Stock · 1,678 shares

Expires not disclosed

F3 · 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, 2026. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2027, January 1, 2028 and January 1, 2029, 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, 2026. The award is subject to service-based vesting conditions and vests in equal annual installments on each of January 1, 2027, January 1, 2028 and January 1, 2029, 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: 0001628280-26-000543 · wk-form4_1767649794.xml · derivative · entry 6

Sharp Jay · CIK 0001965562 · Regional President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,903

Underlying: Common Stock · 487 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 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, 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.

F5 · 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: 0001628280-26-000543 · wk-form4_1767649794.xml · derivative · entry 5

Sharp Jay · CIK 0001965562 · Regional President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,390

Underlying: Common Stock · 929 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 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, 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.

F4 · 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: 0001628280-26-000543 · wk-form4_1767649794.xml · nonDerivative · entry 4

Sharp Jay · CIK 0001965562 · Regional President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 64,639

F2 · 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.

SEC source: 0001628280-26-000543 · wk-form4_1767649794.xml · nonDerivative · entry 3

Sharp Jay · CIK 0001965562 · Regional President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 66,395

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: 0001628280-26-000543 · wk-form4_1767649794.xml · nonDerivative · entry 2

Sharp Jay · CIK 0001965562 · Regional President

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 65,908

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: 0001628280-25-057476 · wk-form4_1765934456.xml · nonDerivative · entry 5

Sharp Jay · CIK 0001965562 · Regional President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 64,979

F2 · shares: This transaction is part of a 10b5-1 plan adopted on March 14, 2025 by the reporting person.

F4 · 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: 0001628280-25-057476 · wk-form4_1765934456.xml · nonDerivative · entry 4

Sharp Jay · CIK 0001965562 · Regional President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 65,079

F2 · shares: This transaction is part of a 10b5-1 plan adopted on March 14, 2025 by the reporting person.

F6 · price: This transaction was executed in multiple trades at prices ranging from $78.68 to $79.14. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide to 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 sold at each separate price.

F4 · 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: 0001628280-25-057476 · wk-form4_1765934456.xml · nonDerivative · entry 3

Sharp Jay · CIK 0001965562 · Regional President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 65,579

F2 · shares: This transaction is part of a 10b5-1 plan adopted on March 14, 2025 by the reporting person.

F5 · price: This transaction was executed in multiple trades at prices ranging from $77.67 to $78.16. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide to 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 sold at each separate price.

F4 · 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: 0001628280-25-057476 · wk-form4_1765934456.xml · nonDerivative · entry 2

Sharp Jay · CIK 0001965562 · Regional President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 66,079

F2 · shares: This transaction is part of a 10b5-1 plan adopted on March 14, 2025 by the reporting person.

F3 · price: This transaction was executed in multiple trades at prices ranging from $76.65 to $77.65. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide to 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 sold at each separate price.

F4 · 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: 0001628280-25-057476 · wk-form4_1765934456.xml · nonDerivative · entry 1

Sharp Jay · CIK 0001965562 · Regional President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 66,979

F1 · shares: Represents a bona fide gift of shares of Limbach Holdings, Inc's. common stock for which no payment or consideration was received by the reporting person.

SEC source: 0001965562-25-000003 · wk-form4_1758140081.xml · nonDerivative · entry 2

Sharp Jay · CIK 0001965562 · Regional President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 67,389

F2 · shares: Represents a bona fide gift of shares of Limbach Holdings, Inc's. common stock for which no payment or consideration was received by the reporting person.

SEC source: 0001965562-25-000003 · wk-form4_1758140081.xml · nonDerivative · entry 1

Sharp Jay · CIK 0001965562 · Regional President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 67,877

F1 · shares: This transaction is part of a 10b5-1 plan adopted on March 14, 2025 by the reporting person.

SEC source: 0001628280-25-031889 · wk-form4_1750193923.xml · nonDerivative · entry 5

Sharp Jay · CIK 0001965562 · Regional President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 69,877

F1 · shares: This transaction is part of a 10b5-1 plan adopted on March 14, 2025 by the reporting person.

F6 · price: This transaction was executed in multiple trades at prices ranging from $139.11 to $139.27. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide to 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 sold at each separate price.

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: 0001628280-25-031889 · wk-form4_1750193923.xml · nonDerivative · entry 4

Sharp Jay · CIK 0001965562 · Regional President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,177

F1 · shares: This transaction is part of a 10b5-1 plan adopted on March 14, 2025 by the reporting person.

F5 · price: This transaction was executed in multiple trades at prices ranging from $138.07 to $138.49. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide to 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 sold at each separate price.

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: 0001628280-25-031889 · wk-form4_1750193923.xml · nonDerivative · entry 3

Sharp Jay · CIK 0001965562 · Regional President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 70,597

F1 · shares: This transaction is part of a 10b5-1 plan adopted on March 14, 2025 by the reporting person.

F4 · price: This transaction was executed in multiple trades at prices ranging from $136.96 to $137.95. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide to 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 sold at each separate price.

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: 0001628280-25-031889 · wk-form4_1750193923.xml · nonDerivative · entry 2

Sharp Jay · CIK 0001965562 · Regional President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 71,477

F1 · shares: This transaction is part of a 10b5-1 plan adopted on March 14, 2025 by the reporting person.

F3 · price: This transaction was executed in multiple trades at prices ranging from $135.61 to $136.43. The price reported above reflects the weighted average price. The reporting person hereby undertakes to provide to 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 sold at each separate price.

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: 0001628280-25-031889 · wk-form4_1750193923.xml · nonDerivative · entry 1

Sharp Jay · CIK 0001965562 · Regional President

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 71,777

F1 · shares: This transaction is part of a 10b5-1 plan adopted on March 14, 2025 by the reporting person.

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: 0001628280-25-012403 · 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: 0001628280-25-000369 · 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: 0001628280-24-011533 · wk-form4_1710537630.xml · nonDerivative · entry 2

Sharp Jay · CIK 0001965562 · President of Limbach

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 61,549

F3 · shares: Reflects the withholding of 9,349 shares by the Company to satisfy tax withholding requirements. Such transaction was exempt from Section 16(b) pursuant to Rule 16b-3.

SEC source: 0001628280-24-011533 · wk-form4_1710537630.xml · nonDerivative · entry 1

Sharp Jay · CIK 0001965562 · President of Limbach

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 70,898

F1 · shares: Represents 21,491 shares of Limbach Holdings, Inc. (the "Company") common stock issued to the reporting person on March 13, 2024 upon vesting of 16,000 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, 2021 through December 31, 2023. 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 1, 2022, January 4, 2023 and January 17, 2023, respectively. Each RSU represents a contingent right to receive one share of Limbach Holdings, Inc. (the "Company") 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 5,495 shares on January 1, 2025 and 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: 0001628280-24-000317 · wk-form4_1704324515.xml · derivative · entry 3

Sharp Jay · CIK 0001965562 · President of Limbach

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,786

Underlying: Common Stock · 2,786 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).

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: 0001628280-24-000317 · wk-form4_1704324515.xml · nonDerivative · entry 2

Sharp Jay · CIK 0001965562 · President of Limbach

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 49,407

F3 · shares: Reflects the withholding of 3,159 shares by the Company to satisfy tax withholding requirements. Such transaction was exempt from Section 16(b) pursuant to Rule 16b-3.

SEC source: 0001628280-23-018415 · wf-form4_168426797025580.xml · derivative · entry 3

Sharp Jay · CIK 0001965562 · President of Limbach

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 311 shares

Expires 2023-07-20

SEC source: 0001628280-23-018415 · wf-form4_168426797025580.xml · nonDerivative · entry 2

Sharp Jay · CIK 0001965562 · President of Limbach

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 52,566

F1 · kind: On April 24, 2023, the Reporting Person exercised a warrant to purchase 311 shares of the Limbach Holdings, Inc. (the "Company") Common Stock for $12.50 per share. The Reporting Person paid the exercise price on a cashless basis, resulting in the issuer's withholding of 222 of the warrant shares to pay the exercise price and issuing to the Reporting Person the remaining 89 shares.

SEC source: 0001628280-23-018415 · wf-form4_168426797025580.xml · nonDerivative · entry 1

Sharp Jay · CIK 0001965562 · President of Limbach

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 52,788