NATURAL GAS SERVICES GROUP

Ticker: NGS CUSIP: 63886Q109 Class: Common Stock

Advisors Asset Management, Inc.'s Holding History (CIK: 0001297376)

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

Q4 2015
Shares 8,216 Value ($000) $183 Avg Close $21.48 Range $18.28 - $24.21
Q3 2015
Shares 9,566 Value ($000) $185 Avg Close $20.31 Range $18.37 - $22.64
Q2 2015
Shares 10,845 Value ($000) $247 Avg Close $23.06 Range $19.10 - $25.82
Q1 2015
Shares 11,747 Value ($000) $226 Avg Close $19.65 Range $17.69 - $23.12
Q4 2014
Shares 15,482 Value ($000) $357 Avg Close $23.39 Range $20.44 - $26.73
Q3 2014
Shares 23,817 Value ($000) $573 Avg Close $28.91 Range $23.00 - $33.65
Q2 2014
Shares 20,826 Value ($000) $689 Avg Close $30.73 Range $28.13 - $34.48
Q1 2014
Shares 11,497 Value ($000) $347 Avg Close $29.49 Range $25.23 - $34.59
Q4 2013
Shares 4,758 Value ($000) $131 Avg Close $27.72 Range $24.44 - $30.62
Q3 2013
Shares 2,605 Value ($000) $70 Avg Close $25.86 Range $23.52 - $27.95