ION GEOPHYSICAL CORP

CUSIP: 462044207 Class: COMMON STOCK

ACADIAN ASSET MANAGEMENT LLC's Holding History (CIK: 0000916542)

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

Q1 2021
Shares 463 Value ($000) $1 Avg Close — Range —
Q4 2020
Shares 79,526 Value ($000) $193 Avg Close — Range —
Q3 2020
Shares 195,799 Value ($000) $294 Avg Close — Range —
Q2 2020
Shares 194,798 Value ($000) $456 Avg Close — Range —
Q1 2020
Shares 176,401 Value ($000) $224 Avg Close — Range —
Q4 2019
Shares 172,906 Value ($000) $1,500 Avg Close — Range —
Q3 2019
Shares 106,808 Value ($000) $974 Avg Close — Range —
Q2 2019
Shares 63,595 Value ($000) $512 Avg Close — Range —
Q1 2019
Shares 8,293 Value ($000) $120 Avg Close — Range —
Q3 2018
Shares 4,493 Value ($000) $70 Avg Close — Range —
Q2 2018
Shares 102,350 Value ($000) $2,487 Avg Close — Range —
Q1 2018
Shares 151,202 Value ($000) $4,098 Avg Close — Range —
Q4 2017
Shares 61,611 Value ($000) $1,216 Avg Close — Range —
Q3 2017
Shares 23,592 Value ($000) $224 Avg Close — Range —
Q4 2016
Shares 2,404 Value ($000) $14 Avg Close — Range —