OM GROUP INC

CUSIP: 670872100 Class: COM

MARSHALL WACE, LLP's Holding History (CIK: 0001318757)

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

Q3 2015
Shares 139,318 Value ($000) $4,582 Avg Close — Range —
Q2 2015
Shares 15,254 Value ($000) $512 Avg Close — Range —
Q1 2015
Shares 249,065 Value ($000) $7,480 Avg Close — Range —
Q2 2014
Shares 54,743 Value ($000) $1,775 Avg Close — Range —
Q1 2014
Shares 166,174 Value ($000) $5,520 Avg Close — Range —