| CUSIP No. 63886Q109 | Page 1 of 1 Page |
Exhibit 1
JOINT FILING AGREEMENT
Pursuant to Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree, as of January 4, 2021, that only one statement containing the information required by Schedule 13D, and each amendment thereto, need be filed with respect to the ownership by each of the undersigned of shares of common stock of Natural Gas Services Group, Inc., a Colorado corporation, and such statement to which this Joint Filing Agreement is attached as Exhibit 1 is filed on behalf of each of the undersigned.
| MILL ROAD CAPITAL III, L.P. | ||
| By: | Mill Road Capital III GP LLC, its General Partner | |
| By: | /s/ Thomas E. Lynch | |
| Thomas E. Lynch | ||
| Management Committee Director and Chairman | ||
| MILL ROAD CAPITAL III GP LLC | ||
| By: | /s/ Thomas E. Lynch | |
| Thomas E. Lynch | ||
| Management Committee Director and Chairman | ||
| THOMAS E. LYNCH | ||
| /s/ Thomas E. Lynch | ||
| Thomas E. Lynch | ||
