ION GEOPHYSICAL CORP

CUSIP: 462044207 Class: COMMON STOCK

PDT Partners, LLC's Holding History (CIK: 0001564702)

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

Q1 2019
Shares 14,743 Value ($000) $213 Avg Close — Range —
Q4 2018
Shares 16,300 Value ($000) $84 Avg Close — Range —
Q3 2018
Shares 16,300 Value ($000) $253 Avg Close — Range —