ION GEOPHYSICAL CORP

CUSIP: 462044108 Class: COM

Violich Capital Management, Inc.'s Holding History (CIK: 0001326766)

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

Q3 2013
Shares 10,000 Value ($000) $52 Avg Close — Range —
Q2 2013
Shares 10,000 Value ($000) $60 Avg Close — Range —