ION GEOPHYSICAL CORP

CUSIP: 462044108 Class: COM

BRIDGEWAY CAPITAL MANAGEMENT, LLC's Holding History (CIK: 0001107261)

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

Q4 2015
Shares 360,010 Value ($000) $181 Avg Close — Range —
Q3 2015
Shares 360,010 Value ($000) $140 Avg Close — Range —
Q2 2015
Shares 190,000 Value ($000) $203 Avg Close — Range —
Q1 2015
Shares 290,000 Value ($000) $629 Avg Close — Range —
Q4 2014
Shares 290,000 Value ($000) $798 Avg Close — Range —