ION GEOPHYSICAL CORP

CUSIP: 462044108 Class: COM

BROWN BROTHERS HARRIMAN & CO's Holding History (CIK: 0000014661)

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

Q4 2015
Shares 3,500 Value ($000) $2 Avg Close — Range —
Q3 2015
Shares 3,500 Value ($000) $1 Avg Close — Range —
Q2 2015
Shares 3,500 Value ($000) $4 Avg Close — Range —
Q1 2015
Shares 3,500 Value ($000) $8 Avg Close — Range —
Q4 2014
Shares 3,500 Value ($000) $10 Avg Close — Range —
Q3 2014
Shares 3,500 Value ($000) $10 Avg Close — Range —
Q2 2014
Shares 3,500 Value ($000) $15 Avg Close — Range —
Q1 2014
Shares 3,500 Value ($000) $15 Avg Close — Range —
Q4 2013
Shares 3,500 Value ($000) $12 Avg Close — Range —
Q3 2013
Shares 3,500 Value ($000) $18 Avg Close — Range —
Q2 2013
Shares 3,500 Value ($000) $21 Avg Close — Range —
Q1 2013
Shares 3,500 Value ($000) $24 Avg Close — Range —