NATURAL GAS SERVICES

CUSIP: 63886Q10 Class: COM

ARROWSTREET CAPITAL, LIMITED PARTNERSHIP's Holding History (CIK: 0001164508)

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

Q3 2014
Shares 40,902 Value ($000) $985 Avg Close — Range —
Q2 2014
Shares 63,907 Value ($000) $2,113 Avg Close — Range —
Q1 2014
Shares 45,377 Value ($000) $1,368 Avg Close — Range —
Q4 2013
Shares 42,179 Value ($000) $1,163 Avg Close — Range —
Q3 2013
Shares 50,502 Value ($000) $1,354 Avg Close — Range —
Q2 2013
Shares 3,743 Value ($000) $88 Avg Close — Range —