ION GEOPHYSICAL CORP

CUSIP: 462044108 Class: COM

SEI INVESTMENTS CO's Holding History (CIK: 0000350894)

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

Q4 2015
Shares 7,054 Value ($000) $4 Avg Close — Range —
Q2 2015
Shares 569 Value ($000) $1 Avg Close — Range —
Q1 2015
Shares 1,761 Value ($000) $4 Avg Close — Range —
Q4 2014
Shares 142 Value ($000) $0 Avg Close — Range —