GEOSPACE TECHNOLOGIES CORP

Ticker: GEOS CUSIP: 37364X109 Class: Common Stock

DRIEHAUS CAPITAL MANAGEMENT LLC's Holding History (CIK: 0000938206)

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

Q4 2016

Shares 45,563 Value ($000) $928 Avg Close $20.24 Range $16.77 - $23.20

Q3 2016

Shares 14,963 Value ($000) $291 Avg Close $17.28 Range $14.51 - $19.96

Q2 2016

Shares 33,498 Value ($000) $548 Avg Close $16.29 Range $11.82 - $19.92

Q2 2013

Shares 71,580 Value ($000) $4,945 Avg Close $83.42 Range $65.31 - $108.86

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2016	45,563	$928	$20.24	$16.77 - $23.20
Q3 2016	14,963	$291	$17.28	$14.51 - $19.96
Q2 2016	33,498	$548	$16.29	$11.82 - $19.92
Q2 2013	71,580	$4,945	$83.42	$65.31 - $108.86