ION GEOPHYSICAL CORP

CUSIP: 462044108 Class: COM

Nationwide Fund Advisors's Holding History (CIK: 0001097218)

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

Q4 2015
Shares 194,245 Value ($000) $98 Avg Close — Range —
Q3 2015
Shares 88,189 Value ($000) $34 Avg Close — Range —
Q2 2015
Shares 92,614 Value ($000) $99 Avg Close — Range —
Q1 2015
Shares 280,875 Value ($000) $609 Avg Close — Range —
Q4 2014
Shares 290,722 Value ($000) $799 Avg Close — Range —
Q3 2014
Shares 301,770 Value ($000) $842 Avg Close — Range —
Q2 2014
Shares 225,842 Value ($000) $953 Avg Close — Range —
Q1 2014
Shares 102,867 Value ($000) $433 Avg Close — Range —
Q4 2013
Shares 103,005 Value ($000) $340 Avg Close — Range —
Q3 2013
Shares 105,819 Value ($000) $550 Avg Close — Range —
Q2 2013
Shares 166,162 Value ($000) $1,000 Avg Close — Range —