ION GEOPHYSICAL CORP

CUSIP: 462044108 Class: COM

TWO SIGMA INVESTMENTS, LP's Holding History (CIK: 0001179392)

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

Q4 2015
Shares 288,955 Value ($000) $145 Avg Close — Range —
Q2 2015
Shares 10,705 Value ($000) $11 Avg Close — Range —
Q1 2014
Shares 262,462 Value ($000) $1,104 Avg Close — Range —
Q4 2013
Shares 156,211 Value ($000) $516 Avg Close — Range —
Q3 2013
Shares 20,355 Value ($000) $106 Avg Close — Range —
Q2 2013
Shares 33,316 Value ($000) $200 Avg Close — Range —