X0306 4/A 2021-03-18 2021-03-22 0 0001084991 NATURAL GAS SERVICES GROUP INC NGS 0001316004 Taylor Stephen Charles 404 VETERANS AIRPARK LANE SUITE 300 MIDLAND TX 79705 1 1 0 0 Chief Executive Officer Common Stock 2021-03-18 4 A 0 109212 8.91 A 577619 D This amendment to Form 4 is being filed to correct the number of shares granted in connection with the restricted stock award referenced in the original filing, which mistakenly reported 100,626 restricted shares. As noted in Table I, the correct number of shares granted in the award was 109,212. In addition, column 5 of Table has been corrected to show the revised number of shares beneficially owned following the reported transaction. There are no other revisions to the original Form 4 as filed on March 22, 2021. Stephen C. Taylor 2021-04-02