ION GEOPHYSICAL CORP

CUSIP: 462044108 Class: COM

CHARLES SCHWAB INVESTMENT MANAGEMENT INC's Holding History (CIK: 0000884546)

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

Q4 2015
Shares 220,300 Value ($000) $111 Avg Close — Range —
Q3 2015
Shares 220,300 Value ($000) $86 Avg Close — Range —
Q2 2015
Shares 819,600 Value ($000) $877 Avg Close — Range —
Q1 2015
Shares 1,783,590 Value ($000) $3,871 Avg Close — Range —
Q4 2014
Shares 1,513,924 Value ($000) $4,164 Avg Close — Range —
Q3 2014
Shares 1,362,297 Value ($000) $3,801 Avg Close — Range —
Q2 2014
Shares 1,108,915 Value ($000) $4,680 Avg Close — Range —
Q1 2014
Shares 700,009 Value ($000) $2,948 Avg Close — Range —
Q4 2013
Shares 623,680 Value ($000) $2,059 Avg Close — Range —
Q3 2013
Shares 470,183 Value ($000) $2,507 Avg Close — Range —
Q2 2013
Shares 471,034 Value ($000) $2,846 Avg Close — Range —