ION GEOPHYSICAL CORP

CUSIP: 462044207 Class: COMMON STOCK

ARROWSTREET CAPITAL, LIMITED PARTNERSHIP's Holding History (CIK: 0001164508)

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

Q3 2020
Shares 18,089 Value ($000) $27 Avg Close — Range —
Q2 2020
Shares 31,189 Value ($000) $73 Avg Close — Range —
Q1 2020
Shares 18,089 Value ($000) $23 Avg Close — Range —
Q4 2019
Shares 82,990 Value ($000) $720 Avg Close — Range —
Q2 2018
Shares 154,075 Value ($000) $3,744 Avg Close — Range —
Q1 2018
Shares 168,411 Value ($000) $4,564 Avg Close — Range —