ION GEOPHYSICAL CORP

CUSIP: 462044207 Class: COMMON STOCK

ALGERT GLOBAL LLC's Holding History (CIK: 0001275218)

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

Q2 2017
Shares 33,359 Value ($000) $145 Avg Close — Range —
Q1 2017
Shares 42,959 Value ($000) $208 Avg Close — Range —
Q4 2016
Shares 22,579 Value ($000) $135 Avg Close — Range —