ION GEOPHYSICAL CORP

CUSIP: 462044108 Class: COM

TEXAS PERMANENT SCHOOL FUND CORP's Holding History (CIK: 0001223779)

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

Q3 2015
Shares 106,202 Value ($000) $41 Avg Close — Range —
Q2 2015
Shares 109,281 Value ($000) $117 Avg Close — Range —
Q1 2015
Shares 115,553 Value ($000) $251 Avg Close — Range —
Q4 2014
Shares 115,305 Value ($000) $317 Avg Close — Range —
Q3 2014
Shares 116,063 Value ($000) $324 Avg Close — Range —
Q2 2014
Shares 129,368 Value ($000) $546 Avg Close — Range —
Q1 2014
Shares 128,913 Value ($000) $543 Avg Close — Range —
Q4 2013
Shares 128,892 Value ($000) $425 Avg Close — Range —
Q3 2013
Shares 129,715 Value ($000) $675 Avg Close — Range —
Q2 2013
Shares 135,428 Value ($000) $815 Avg Close — Range —
Q1 2013
Shares 135,449 Value ($000) $922 Avg Close — Range —