ION GEOPHYSICAL CORP

CUSIP: 462044207 Class: COMMON STOCK

HighTower Advisors, LLC's Holding History (CIK: 0001462245)

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

Q3 2017
Shares 13,511 Value ($000) $129 Avg Close — Range —
Q2 2017
Shares 13,333 Value ($000) $58 Avg Close — Range —
Q1 2017
Shares 13,333 Value ($000) $65 Avg Close — Range —
Q4 2016
Shares 13,333 Value ($000) $80 Avg Close — Range —
Q3 2016
Shares 13,333 Value ($000) $91 Avg Close — Range —
Q2 2016
Shares 13,333 Value ($000) $83 Avg Close — Range —
Q1 2016
Shares 13,353 Value ($000) $108 Avg Close — Range —