X0609 4 2026-09-15 0 0001606163 Limbach Holdings, Inc. LMB 0001493187 Krzeminski Laurel J false 5102 W LAUREL STREET, SUITE 700 TAMPA FL 33607 1 0 0 0 0 Common Stock 2026-09-15 4 P 0 500 50.575 A 4000 I By SEP-IRA Common Stock 1500 D Common Stock 31452 I By Laurel J. Krzeminski Revocable Trust The ownership amounts reported herein reflect the separate presentation of shares held through the Reporting Person's SEP IRA, shares held jointly with the Reporting Person's spouse and shares held by the Laurel J. Krzeminski Revocable Trust, of which the Reporting Person is the settlor and a co-trustee. Prior reports presented these holdings in the aggregate as directly owned. This reclassification does not reflect an acquisition or disposition of securities or change in the Reporting Person's aggregate beneficial ownership. The 500-share purchase reported herein is included in the SEP IRA balance. /s/ Jeremiah G. Garvey, Attorney-in-Fact for Laurel J. Krzeminski 2026-09-16