GEOSPACE TECHNOLOGIES CORP

Ticker: GEOS CUSIP: 37364X109 Class: Common Stock

Parallax Volatility Advisers, L.P.'s Holding History (CIK: 0001521001)

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

Q4 2017

Shares 1,974 Value ($000) $26 Avg Close $15.45 Range $12.09 - $18.71

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2017	1,974	$26	$15.45	$12.09 - $18.71