ION GEOPHYSICAL CORP

CUSIP: 462044108 Class: COM

NORTHERN TRUST CORP's Holding History (CIK: 0000073124)

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

Q4 2015
Shares 1,506,333 Value ($000) $758 Avg Close — Range —
Q3 2015
Shares 1,575,213 Value ($000) $614 Avg Close — Range —
Q2 2015
Shares 1,410,333 Value ($000) $1,509 Avg Close — Range —
Q1 2015
Shares 1,586,667 Value ($000) $3,442 Avg Close — Range —
Q4 2014
Shares 1,475,484 Value ($000) $4,058 Avg Close — Range —
Q3 2014
Shares 1,529,930 Value ($000) $4,268 Avg Close — Range —
Q2 2014
Shares 1,683,006 Value ($000) $7,102 Avg Close — Range —
Q1 2014
Shares 1,789,433 Value ($000) $7,533 Avg Close — Range —
Q4 2013
Shares 1,885,800 Value ($000) $6,223 Avg Close — Range —
Q3 2013
Shares 1,930,124 Value ($000) $10,037 Avg Close — Range —
Q2 2013
Shares 2,021,823 Value ($000) $12,172 Avg Close — Range —