ION GEOPHYSICAL CORP

CUSIP: 462044108 Class: COM

PRICE T ROWE ASSOCIATES INC /MD/'s Holding History (CIK: 0000080255)

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

Q2 2015
Shares 119,900 Value ($000) $128 Avg Close — Range —
Q1 2015
Shares 119,900 Value ($000) $260 Avg Close — Range —
Q4 2014
Shares 105,900 Value ($000) $291 Avg Close — Range —
Q3 2014
Shares 81,300 Value ($000) $227 Avg Close — Range —
Q2 2014
Shares 81,300 Value ($000) $343 Avg Close — Range —
Q1 2014
Shares 81,300 Value ($000) $342 Avg Close — Range —
Q4 2013
Shares 2,781,520 Value ($000) $9,179 Avg Close — Range —
Q3 2013
Shares 2,840,792 Value ($000) $14,772 Avg Close — Range —
Q2 2013
Shares 2,974,100 Value ($000) $17,904 Avg Close — Range —