ION GEOPHYSICAL CORP

CUSIP: 462044207 Class: COMMON STOCK

RHUMBLINE ADVISERS's Holding History (CIK: 0001115418)

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

Q1 2019
Shares 13,887 Value ($000) $201 Avg Close — Range —
Q4 2018
Shares 14,506 Value ($000) $75 Avg Close — Range —
Q2 2018
Shares 10,531 Value ($000) $256 Avg Close — Range —
Q1 2016
Shares 14,883 Value ($000) $120 Avg Close — Range —