ION GEOPHYSICAL CORP

CUSIP: 462044207 Class: COMMON STOCK

SEI INVESTMENTS CO's Holding History (CIK: 0000350894)

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

Q1 2019
Shares 2,244 Value ($000) $26 Avg Close — Range —
Q4 2018
Shares 1,378 Value ($000) $3 Avg Close — Range —
Q3 2018
Shares 1,837 Value ($000) $25 Avg Close — Range —
Q2 2018
Shares 880 Value ($000) $21 Avg Close — Range —
Q1 2018
Shares 653 Value ($000) $18 Avg Close — Range —
Q4 2017
Shares 762 Value ($000) $15 Avg Close — Range —
Q3 2017
Shares 789 Value ($000) $8 Avg Close — Range —
Q2 2017
Shares 943 Value ($000) $4 Avg Close — Range —
Q1 2017
Shares 961 Value ($000) $5 Avg Close — Range —
Q4 2016
Shares 858 Value ($000) $5 Avg Close — Range —
Q3 2016
Shares 970 Value ($000) $7 Avg Close — Range —
Q2 2016
Shares 1,047 Value ($000) $6 Avg Close — Range —