X0508 4 2026-01-01 0 0001606163 Limbach Holdings, Inc. LMB 0001612424 Horowitz Joshua 797 COMMONWEALTH DRIVE WARRENDALE PA 15086 1 0 0 0 0 Common Stock 2026-01-01 4 M 0 956 0 A 42785 D Common Stock 164600 I Palm Global Small Cap Master Fund LP Restricted Stock Units 2026-01-01 4 M 0 956 0 D Common Stock 956 0 D Restricted Stock Units 2026-01-01 4 A 0 1498 0 A Common Stock 1498 1498 D Palm Management (US) LLC, as the investment manager of Palm Global Small Cap Master Fund LP ("Palm Global"), may be deemed to be a beneficial owner of the shares of common stock disclosed as directly owned by Palm Global. Due to his positions as a portfolio manager and special limited partner of Palm Global and as an employee of Palm Management (US) LLC, Mr. Horowitz may be deemed to be a beneficial owner of the shares of common stock disclosed as directly owned by Palm Global. Palm Management (US) LLC and Mr. Horowitz expressly disclaim such beneficial ownership except to the extent of their pecuniary interest therein. 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. This award of RSUs was granted on January 1, 2026. The RSUs are scheduled to cliff vest on January 1, 2027. /s/ Jeremiah G. Garvey, Attorney-in-Fact for Joshua S. Horowitz 2026-01-05