NATURAL GAS SERVICES GROUP

Ticker: NGS CUSIP: 63886Q109 Class: Common Stock

ProShare Advisors LLC's Holding History (CIK: 0001357955)

Note: Option positions (PUT/CALL) are excluded.

Q1 2014

Shares 12,503 Value ($000) $377 Avg Close $29.49 Range $25.23 - $34.59

Q3 2013

Shares 7,855 Value ($000) $211 Avg Close $25.86 Range $23.52 - $27.95

Period	Shares	Value ($000)	Average Close	Price Range
Q1 2014	12,503	$377	$29.49	$25.23 - $34.59
Q3 2013	7,855	$211	$25.86	$23.52 - $27.95