OM GROUP INC

CUSIP: 670872100 Class: COM

GAMCO INVESTORS, INC. ET AL's Holding History (CIK: 0000807249)

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

Q3 2015
Shares 122,400 Value ($000) $4,026 Avg Close — Range —
Q2 2015
Shares 31,582 Value ($000) $1,061 Avg Close — Range —