ION GEOPHYSICAL CORP

CUSIP: 462044108 Class: COM

ProShare Advisors LLC's Holding History (CIK: 0001357955)

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

Q4 2015
Shares 20,540 Value ($000) $10 Avg Close — Range —
Q3 2015
Shares 15,851 Value ($000) $6 Avg Close — Range —
Q2 2015
Shares 20,134 Value ($000) $22 Avg Close — Range —
Q1 2015
Shares 28,408 Value ($000) $62 Avg Close — Range —
Q4 2014
Shares 30,574 Value ($000) $84 Avg Close — Range —
Q3 2014
Shares 54,116 Value ($000) $151 Avg Close — Range —
Q2 2014
Shares 67,441 Value ($000) $285 Avg Close — Range —
Q1 2014
Shares 137,456 Value ($000) $579 Avg Close — Range —
Q4 2013
Shares 11,497 Value ($000) $38 Avg Close — Range —
Q3 2013
Shares 87,124 Value ($000) $453 Avg Close — Range —
Q2 2013
Shares 90,641 Value ($000) $546 Avg Close — Range —