X0306 4 2019-06-28 0 0001084991 NATURAL GAS SERVICES GROUP INC ngs 0001385056 Lawrence G Larry C/O LEGACY RESERVES GP, LLC 303 W. WALL STREET, SUITE 1600 MIDLAND TX 79701 0 1 0 0 Chief Financial Officer Common Stock 2019-06-28 4 A 0 20000 17.29 A 66002 D Common Stock 11333 I By Rabbi Trust Restricted Stock Units Common Stock 7667 7667 D Employee Stock Option 17.81 2012-01-25 2021-01-24 Common Stock 5000 5000 D The acquisition reflects an award of Restricted Stock pursuant to the Company's 2019 Equity Incentive Plan. The award vests in one-third annual increments beginning on the first anniversary of the grant date, subject to accelerated vesting under certain circumstances. The amount of securities beneficially owned has been adjusted to add 210 shares of Company common stock in order to correct an inadvertent error in the number of shares withheld for tax withholding in connection with the Form 4 filed on March 19, 2019. Not Applicable. Each RSU represents the right to receive one share of Company common stock upon vesting without payment. G. Larry Lawrence 2019-07-01