ION GEOPHYSICAL CORP

CUSIP: 462044207 Class: COMMON STOCK

Walleye Trading LLC's Holding History (CIK: 0001388391)

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

Q4 2018
Shares 17,186 Value ($000) $89 Avg Close — Range —
Q4 2016
Shares 7,900 Value ($000) $47 Avg Close — Range —
Q3 2016
Shares 200 Value ($000) $1 Avg Close — Range —