ION GEOPHYSICAL CORP

CUSIP: 462044108 Class: COM

DEARBORN PARTNERS LLC's Holding History (CIK: 0001206792)

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

Q3 2014
Shares 10,000 Value ($000) $28 Avg Close — Range —
Q2 2014
Shares 32,300 Value ($000) $136 Avg Close — Range —
Q1 2014
Shares 32,300 Value ($000) $136 Avg Close — Range —