ION GEOPHYSICAL CORP

CUSIP: 462044108 Class: COM

VANGUARD GROUP INC's Holding History (CIK: 0000102909)

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

Q4 2015
Shares 6,291,508 Value ($000) $3,165 Avg Close — Range —
Q3 2015
Shares 5,307,957 Value ($000) $2,070 Avg Close — Range —
Q2 2015
Shares 6,652,170 Value ($000) $7,119 Avg Close — Range —
Q1 2015
Shares 9,113,771 Value ($000) $19,777 Avg Close — Range —
Q4 2014
Shares 8,491,811 Value ($000) $23,353 Avg Close — Range —
Q3 2014
Shares 9,270,258 Value ($000) $25,864 Avg Close — Range —
Q2 2014
Shares 8,574,437 Value ($000) $36,184 Avg Close — Range —
Q1 2014
Shares 8,715,856 Value ($000) $36,693 Avg Close — Range —
Q4 2013
Shares 7,451,233 Value ($000) $24,589 Avg Close — Range —
Q3 2013
Shares 7,566,420 Value ($000) $39,346 Avg Close — Range —
Q2 2013
Shares 7,395,792 Value ($000) $44,522 Avg Close — Range —