X0508 4 2026-01-01 0 0001606163 Limbach Holdings, Inc. LMB 0001965575 Angerosa Nicholas 797 COMMONWEALTH DRIVE WARRENDALE PA 15086 0 1 0 0 Regional President 0 Common Stock 54350 D Common Stock 2026-01-01 4 M 0 771 0 A 55121 D Common Stock 2026-01-01 4 M 0 416 0 A 55537 D Common Stock 2026-01-01 4 F 0 1579 77.85 D 53958 D Restricted Stock Units 2026-01-01 4 M 0 771 0 D Common Stock 771 2019 D Restricted Stock Units 2026-01-01 4 M 0 416 0 D Common Stock 416 1603 D Restricted Stock Units 2026-01-01 4 A 0 1440 0 A Common Stock 1440 3043 D The amount of common stock includes an aggregate 2,507 service-based restricted stock units (each, an "RSU") that vested on January 1, 2026 related to certain awards granted on each January 4, 2023 and January 17, 2023. 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. 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. 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. 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. /s/ Jeremiah G. Garvey, Attorney-in-Fact for Nicholas S. Angerosa 2026-01-05