ION GEOPHYSICAL CORP

CUSIP: 462044108 Class: COM

GLENMEDE TRUST CO NA's Holding History (CIK: 0000314949)

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

Q2 2015
Shares 1,500 Value ($000) $1 Avg Close — Range —
Q1 2015
Shares 1,500 Value ($000) $3 Avg Close — Range —
Q4 2014
Shares 1,500 Value ($000) $4 Avg Close — Range —
Q3 2014
Shares 1,500 Value ($000) $4 Avg Close — Range —
Q2 2014
Shares 1,500 Value ($000) $6 Avg Close — Range —
Q1 2014
Shares 1,500 Value ($000) $6 Avg Close — Range —
Q4 2013
Shares 1,500 Value ($000) $4 Avg Close — Range —
Q3 2013
Shares 1,500 Value ($000) $7 Avg Close — Range —
Q2 2013
Shares 1,500 Value ($000) $9 Avg Close — Range —