ION GEOPHYSICAL CORP

CUSIP: 462044108 Class: COM

TWO SIGMA ADVISERS, LP's Holding History (CIK: 0001478735)

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

Q4 2015
Shares 124,668 Value ($000) $63 Avg Close — Range —
Q3 2015
Shares 33,700 Value ($000) $13 Avg Close — Range —
Q2 2015
Shares 11,599 Value ($000) $12 Avg Close — Range —
Q1 2014
Shares 34,696 Value ($000) $146 Avg Close — Range —
Q4 2013
Shares 16,096 Value ($000) $54 Avg Close — Range —
Q3 2013
Shares 14,496 Value ($000) $76 Avg Close — Range —
Q2 2013
Shares 14,196 Value ($000) $86 Avg Close — Range —