ION GEOPHYSICAL CORP

CUSIP: 462044108 Class: COM

Arizona State Retirement System's Holding History (CIK: 0001558481)

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

Q3 2015
Shares 61,697 Value ($000) $24 Avg Close — Range —
Q4 2014
Shares 89,066 Value ($000) $244 Avg Close — Range —
Q3 2014
Shares 88,766 Value ($000) $247 Avg Close — Range —
Q2 2014
Shares 92,566 Value ($000) $390 Avg Close — Range —
Q1 2014
Shares 91,366 Value ($000) $384 Avg Close — Range —
Q4 2013
Shares 96,066 Value ($000) $317 Avg Close — Range —
Q3 2013
Shares 109,166 Value ($000) $567 Avg Close — Range —
Q2 2013
Shares 109,066 Value ($000) $656 Avg Close — Range —
Q1 2013
Shares 105,766 Value ($000) $720 Avg Close — Range —