ION GEOPHYSICAL CORP

CUSIP: 462044207 Class: COMMON STOCK

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

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

Q1 2019
Shares 25,776 Value ($000) $373 Avg Close — Range —
Q4 2018
Shares 19,800 Value ($000) $103 Avg Close — Range —
Q3 2018
Shares 56,475 Value ($000) $879 Avg Close — Range —
Q2 2018
Shares 22,590 Value ($000) $549 Avg Close — Range —
Q1 2016
Shares 14,686 Value ($000) $119 Avg Close — Range —