ION GEOPHYSICAL CORP

CUSIP: 462044108 Class: COM

Tower Research Capital LLC (TRC)'s Holding History (CIK: 0001533421)

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

Q4 2015
Shares 9,091 Value ($000) $5 Avg Close — Range —
Q3 2015
Shares 19,676 Value ($000) $8 Avg Close — Range —
Q2 2015
Shares 14,933 Value ($000) $16 Avg Close — Range —
Q1 2015
Shares 5,353 Value ($000) $12 Avg Close — Range —
Q4 2014
Shares 655 Value ($000) $2 Avg Close — Range —
Q3 2014
Shares 52,758 Value ($000) $148 Avg Close — Range —
Q1 2014
Shares 122 Value ($000) $1 Avg Close — Range —
Q3 2013
Shares 3,236 Value ($000) $17 Avg Close — Range —
Q2 2013
Shares 22 Value ($000) $0 Avg Close — Range —