X0508 4 2025-10-09 0 0001084991 NATURAL GAS SERVICES GROUP INC NGS 0001629779 Tucker Brian L 1250 NE LOOP 410 #1000 SAN ANTONIO TX 78209 0 1 0 0 President & COO 0 Common Stock 2025-10-09 4 A 0 2121 A 5843 D Common Stock 2025-10-09 4 F 0 644 27.1 D 5199 D Restricted Stock Units 2025-10-09 4 M 0 2121 0 A Common Stock 2121 2120 D Restricted Stock Units Common Stock 7529 7529 D Restricted Stock Units Common Stock 9014 9014 D Not applicable. Represents shares acquired in connection with the vesting of a Restricted Stock Unit ("RSU") award. Not applicable. Each RSU represents the right to receive one share of the Company's common stock upon vesting without payment. Brian L. Tucker 2025-10-10