NGS Reports Year-over-Year Net Income Growth of 29% First Quarter 2015 Earnings of 29 cents per Diluted Share

MIDLAND, Texas May 7, 2015 - Natural Gas Services Group, Inc. (NGS), a leading provider of gas compression equipment and services to the natural gas industry, announces its financial results for the three months ended March 31, 2015.

Revenue: Total revenue was $24.7 million, an increase from $22.3 million, or 11%, for the three months ended March 31, 2015 compared to the same period ended March 31, 2014. This change was attributable to an increase of 10% in rental revenue to $20.6 million from $18.8 million and an almost $600,000 increase in sales revenue to $3.9 million for the period ended March 31, 2015 compared to the same three month period in 2014. Total revenue decreased between consecutive quarters by $2.4 million to $24.7 million from $27.1 million, mainly due to an expected decline in compressor sales.

Gross Margins: Total gross margin for the three months ended March 31, 2015 increased 18% to $14.2 million from $12.0 million for the same period ended March 31, 2014. Overall gross margin percentage was 57% for the three months ended March 31, 2015 and 54% for the same period ended March 31, 2014. The difference in gross margin percentages between quarters was driven by higher gross margins from our rental operations. Sequentially, gross margin decreased $700,000 to $14.2 million from $14.9 million as a result of the slowdown in compressor sales.

Operating Income: Operating income for the three months ended March 31, 2015 was $5.8 million, up 33% from the comparative prior year`s level of $4.4 million. The increase was due to higher total sales revenues, increased rental revenue and stronger rental gross margins in the current quarter. Sequentially, operating income decreased to $5.8 million for the three months ended March 31, 2015 from $6.7 million in the period ended December 31, 2014, primarily due to lower compressor sales between the periods.

Net Income: Net income for the three months ended March 31, 2015 increased 29% to $3.7 million, when compared to net income of $2.9 million for the same period in 2014, and increased to 15% of revenue from 13%. This increase was attributable to higher revenues in all segments. Sequentially, net income decreased approximately $300,000 to $3.7 million from $4.0 million, but remained flat at 15% of revenue. This is decrease is because of lower compressor sales between the periods.

Earnings Per Share: Comparing the first quarter of 2015 versus 2014, earnings per diluted share was 29 cents, up from 23 cents. Diluted earnings per share decreased to 29 cents from 32 cents, between sequential quarters.