ION GEOPHYSICAL CORP

CUSIP: 462044108 Class: COM

TOCQUEVILLE ASSET MANAGEMENT L.P.'s Holding History (CIK: 0000883961)

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

Q4 2013
Shares 576,595 Value ($000) $1,903 Avg Close — Range —
Q3 2013
Shares 652,764 Value ($000) $3,394 Avg Close — Range —
Q2 2013
Shares 693,955 Value ($000) $4,178 Avg Close — Range —