OM GROUP INC

CUSIP: 670872100 Class: COM

GROUP ONE TRADING, L.P.'s Holding History (CIK: 0000932540)

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

Q3 2015
Shares 17,900 Value ($000) $589 Avg Close — Range —
Q2 2015
Shares 1,676 Value ($000) $56 Avg Close — Range —
Q1 2015
Shares 800 Value ($000) $24 Avg Close — Range —
Q3 2014
Shares 2,513 Value ($000) $65 Avg Close — Range —
Q1 2014
Shares 4,973 Value ($000) $165 Avg Close — Range —
Q3 2013
Shares 286 Value ($000) $10 Avg Close — Range —
Q2 2013
Shares 451 Value ($000) $14 Avg Close — Range —