OM GROUP INC

CUSIP: 67087210 Class: COM

ARROWSTREET CAPITAL, LIMITED PARTNERSHIP's Holding History (CIK: 0001164508)

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

Q3 2015
Shares 25,052 Value ($000) $842 Avg Close — Range —
Q2 2015
Shares 25,052 Value ($000) $842 Avg Close — Range —
Q1 2015
Shares 61,655 Value ($000) $1,851 Avg Close — Range —
Q4 2014
Shares 26,691 Value ($000) $795 Avg Close — Range —
Q1 2014
Shares 33,243 Value ($000) $1,104 Avg Close — Range —
Q3 2013
Shares 29,283 Value ($000) $989 Avg Close — Range —