ION GEOPHYSICAL CORP

CUSIP: 462044108 Class: COM

Municipal Employees' Retirement System of Michigan's Holding History (CIK: 0001588873)

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

Q3 2015
Shares 26,050 Value ($000) $10 Avg Close — Range —
Q2 2015
Shares 24,430 Value ($000) $26 Avg Close — Range —
Q1 2015
Shares 24,100 Value ($000) $52 Avg Close — Range —
Q4 2014
Shares 32,700 Value ($000) $90 Avg Close — Range —
Q3 2014
Shares 32,700 Value ($000) $91 Avg Close — Range —
Q2 2014
Shares 31,600 Value ($000) $133 Avg Close — Range —
Q1 2014
Shares 29,700 Value ($000) $125 Avg Close — Range —