ION GEOPHYSICAL CORP

CUSIP: 462044108 Class: COM

Aperio Group, LLC's Holding History (CIK: 0001364615)

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

Q4 2014
Shares 13,663 Value ($000) $38 Avg Close — Range —
Q3 2014
Shares 13,287 Value ($000) $37 Avg Close — Range —
Q2 2014
Shares 40,354 Value ($000) $170 Avg Close — Range —
Q1 2014
Shares 38,006 Value ($000) $160 Avg Close — Range —