ION GEOPHYSICAL CORP

CUSIP: 462044207 Class: COMMON STOCK

STRS OHIO's Holding History (CIK: 0000820478)

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

Q3 2018
Shares 17,000 Value ($000) $264 Avg Close — Range —
Q2 2018
Shares 17,000 Value ($000) $413 Avg Close — Range —
Q1 2016
Shares 14,720 Value ($000) $118 Avg Close — Range —