ION GEOPHYSICAL CORP

CUSIP: 462044108 Class: COM

OXFORD ASSET MANAGEMENT LLP's Holding History (CIK: 0001438284)

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

Q1 2015
Shares 840,106 Value ($000) $1,823 Avg Close — Range —
Q4 2014
Shares 665,712 Value ($000) $1,839 Avg Close — Range —
Q3 2013
Shares 483,469 Value ($000) $2,514 Avg Close — Range —
Q2 2013
Shares 230,474 Value ($000) $1,387 Avg Close — Range —