ION GEOPHYSICAL CORP

CUSIP: 462044108 Class: COM

TEACHER RETIREMENT SYSTEM OF TEXAS's Holding History (CIK: 0000796848)

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

Q3 2015
Shares 16,153 Value ($000) $6 Avg Close — Range —
Q2 2015
Shares 5,100 Value ($000) $5 Avg Close — Range —
Q1 2015
Shares 3,981 Value ($000) $9 Avg Close — Range —
Q4 2014
Shares 3,976 Value ($000) $11 Avg Close — Range —
Q3 2014
Shares 4,855 Value ($000) $14 Avg Close — Range —
Q2 2014
Shares 4,855 Value ($000) $20 Avg Close — Range —
Q1 2014
Shares 4,855 Value ($000) $20 Avg Close — Range —
Q4 2013
Shares 4,697 Value ($000) $16 Avg Close — Range —
Q3 2013
Shares 15,551 Value ($000) $81 Avg Close — Range —
Q2 2013
Shares 8,520 Value ($000) $51 Avg Close — Range —