LMB · Limbach Holdings, Inc.

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

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

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.

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.

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

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.

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

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.

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

This award of RSUs was granted on May 18, 2026. The award is subject to service-based vesting conditions and vests in three annual installments on May 18, 2027, May 18, 2028 and May 18, 2029, with the final installment adjusted to reflect that no fractional shares will be issued, subject to continued employment through each applicable vesting date. The amounts reported above (related to this grant) do not include market-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.

This transaction is part of a 10b5-1 plan adopted on December 16, 2025 by the reporting person.

This transaction is part of a 10b5-1 plan adopted on December 16, 2025 by the reporting person.

This transaction was executed in multiple trades at prices ranging from $100.00 to $100.50. 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.

This transaction is part of a 10b5-1 plan adopted on December 16, 2025 by the reporting person.

This transaction was executed in multiple trades at prices ranging from $85.18 to $85.82. 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.

This transaction is part of a 10b5-1 plan adopted on December 16, 2025 by the reporting person.

This transaction was executed in multiple trades at prices ranging from $85.00 to $85.50. 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.

This transaction is part of a 10b5-1 plan adopted on December 16, 2025 by the reporting person.

This transaction was executed in multiple trades at prices ranging from $85.00 to $85.54. 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.

This transaction is part of a 10b5-1 plan adopted on December 16, 2025 by the reporting person.

This transaction was executed in multiple trades at prices ranging from $77.57 to $78.54. 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.

This transaction is part of a 10b5-1 plan adopted on December 16, 2025 by the reporting person.

This transaction was executed in multiple trades at prices ranging from $78.57 to $79.17. 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.

This transaction is part of a 10b5-1 plan adopted on December 16, 2025 by the reporting person.

This transaction was executed in multiple trades at prices ranging from $79.99 to $80.74. 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.

This transaction is part of a 10b5-1 plan adopted on December 16, 2025 by the reporting person.

This transaction was executed in multiple trades at prices ranging from $76.57 to $77.56. 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.

This transaction is part of a 10b5-1 plan adopted on December 16, 2025 by the reporting person.

This transaction was executed in multiple trades at prices ranging from $81.16 to $81.87. 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.

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.

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

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.

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

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.

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

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.

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

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.

Represents 22,559 shares of Limbach Holdings, Inc. (the "Company") common stock issued to the reporting person on March 2, 2026 upon vesting of 15,040 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.

Reflects the withholding of 16,070 shares by the Company to satisfy tax withholding requirements. Such transaction was exempt from Section 16(b) pursuant to Rule 16b-3.

Represents 40,835 shares of Limbach Holdings, Inc. (the "Company") common stock issued to the reporting person on March 2, 2026 upon vesting of 27,224 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.

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.

Reflects the withholding of 8,878 shares by the Company to satisfy tax withholding requirements. Such transaction was exempt from Section 16(b) pursuant to Rule 16b-3.

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.

Reflects the withholding of 20,466 shares by the Company to satisfy tax withholding requirements. Such transaction was exempt from Section 16(b) pursuant to Rule 16b-3.

Represents 52,008 shares of Limbach Holdings, Inc. (the "Company") common stock issued to the reporting person on March 2, 2026 upon vesting of 34,672 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.

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.

This award of RSUs was granted on January 20, 2026. The RSUs are scheduled to cliff vest on January 1, 2027.

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).

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.

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.

This award of RSUs was granted on January 1, 2025. The RSUs cliff vested on January 1, 2026.

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.

This award of RSUs was granted on January 1, 2026. The RSUs are scheduled to cliff vest on January 1, 2027.

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).

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.

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).

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.

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.

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).

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.

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.

This award of RSUs was granted on January 1, 2026. The RSUs are scheduled to cliff vest on January 1, 2027.

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).

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.

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.

This award of RSUs was granted on January 1, 2026. The RSUs are scheduled to cliff vest on January 1, 2027.

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).

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.