ION GEOPHYSICAL CORP

CUSIP: 462044108 Class: COM

Parallax Volatility Advisers, L.P.'s Holding History (CIK: 0001521001)

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

Q1 2015
Shares 4,204 Value ($000) $9 Avg Close — Range —
Q4 2014
Shares 1,907 Value ($000) $5 Avg Close — Range —
Q1 2014
Shares 856 Value ($000) $4 Avg Close — Range —
Q4 2013
Shares 618 Value ($000) $2 Avg Close — Range —