| NGSG | VOTE BY INTERNET - www.proxyvote.com |
| NATURAL GAS SERVICES GROUP, INC. | Use the Internet to transmit your voting instructions and for electronic delivery, of information, up until 11:59 P.M. Eastern Time, June 15, 2016. |
NATURAL GAS SERVICES GROUP, INC.
| 508 WEST WALL STREET, SUITE 550 | Have your proxy card in hand when you access the web site and |
| MIDLAND, TX 79701 | follow the instructions to obtain your records and to create an electronic |
voting instruction form.
VOTE BY PHONE - 1-800-690-6903
Use any touch-tone telephone to transmit your voting instructions and for electronic delivery, of information, up until 11:59 P.M. Eastern Time, June 15, 2016. Have your proxy card in hand when you call and then follow the instructions.
VOTE BY MAIL
Mark, sign and date your proxy card and return it in the postage-paid envelope we have provided or return it to Vote Processing, c/o Broadridge, 51 Mercedes Way, Edgewood, NY 11717.
TO VOTE, MARK BLOCKS BELOW IN BLUE OR BLACK INK AS FOLLOWS: KEEP THIS PORTION FOR YOUR RECORDS
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DETACH AND RETURN THIS PORTION ONLYTHIS PROXY CARD IS VALID ONLY WHEN SIGNED AND DATED. 
Important Notice Regarding the Availability of Proxy Materials for the Annual Meeting: The Notice & Proxy Statement, 10-K/Annual Report Combo is/are available at www.proxyvote.com .
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NATURAL GAS SERVICES GROUP, INC. THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS ANNUAL MEETING OF SHAREHOLDERS JUNE 16, 2016. The shareholder(s) hereby appoint(s) Stephen C. Taylor and G. Larry Lawrence, or either of them, as proxies, each with the power to appoint his substitute, and hereby authorizes them to represent and to vote, as designated on the reverse side of this ballot, all of the shares of Common Stock of NATURAL GAS SERVICES GROUP, INC. that the shareholder(s) is/are entitled to vote at the Annual Meeting of Shareholders to be held at 8:30 AM, CDT on June 16, 2016, at the Petroleum Club of Midland, at 501 West Wall Street, Midland, TX 79701, and any adjournment or postponement thereof. THIS PROXY, WHEN PROPERLY EXECUTED WILL BE VOTED AS DIRECTED BY THE SHAREHOLDER(S). IF NO SUCH DIRECTIONS ARE MADE, THIS PROXY WILL BE VOTED FOR THE ELECTION OF THE NOMINEE LISTED ON THE REVERSE SIDE FOR THE BOARD OF DIRECTORS and FOR ITEMS 2, 3, 4 AND 5. IF ANY OTHER MATTER PROPERLY COMES BEFORE THE MEETING, THE PERSONS NAMED IN THE PROXY WILL VOTE IN THEIR DISCRETION. PLEASE MARK, SIGN, DATE AND RETURN THIS PROXY CARD PROMPTLY USING THE ENCLOSED REPLY ENVELOPE. |
Continued and to be signed on reverse side |