ION GEOPHYSICAL CORP

CUSIP: 462044108 Class: COM

OAK ASSOCIATES LTD /OH/'s Holding History (CIK: 0000836372)

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

Q2 2015
Shares 32,550 Value ($000) $35 Avg Close — Range —
Q1 2015
Shares 118,700 Value ($000) $258 Avg Close — Range —
Q4 2014
Shares 118,700 Value ($000) $326 Avg Close — Range —
Q3 2014
Shares 118,700 Value ($000) $331 Avg Close — Range —
Q2 2014
Shares 118,700 Value ($000) $501 Avg Close — Range —
Q1 2014
Shares 118,700 Value ($000) $500 Avg Close — Range —
Q4 2013
Shares 118,700 Value ($000) $392 Avg Close — Range —