ION GEOPHYSICAL CORP

CUSIP: 462044108 Class: COM

ALLIANCEBERNSTEIN L.P.'s Holding History (CIK: 0001109448)

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

Q4 2015
Shares 189,250 Value ($000) $95 Avg Close — Range —
Q3 2015
Shares 198,290 Value ($000) $77 Avg Close — Range —
Q2 2015
Shares 198,600 Value ($000) $213 Avg Close — Range —
Q1 2015
Shares 198,600 Value ($000) $431 Avg Close — Range —
Q4 2014
Shares 202,000 Value ($000) $556 Avg Close — Range —
Q3 2014
Shares 214,700 Value ($000) $599 Avg Close — Range —
Q2 2014
Shares 224,700 Value ($000) $948 Avg Close — Range —
Q1 2014
Shares 224,700 Value ($000) $946 Avg Close — Range —
Q4 2013
Shares 227,407 Value ($000) $750 Avg Close — Range —
Q3 2013
Shares 258,349 Value ($000) $1,343 Avg Close — Range —
Q2 2013
Shares 255,049 Value ($000) $1,535 Avg Close — Range —