ION GEOPHYSICAL CORP

CUSIP: 462044108 Class: COM

GSA CAPITAL PARTNERS LLP's Holding History (CIK: 0001362033)

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

Q3 2015
Shares 364,133 Value ($000) $142 Avg Close — Range —
Q3 2013
Shares 47,358 Value ($000) $246 Avg Close — Range —
Q2 2013
Shares 42,158 Value ($000) $254 Avg Close — Range —