OM GROUP INC

CUSIP: 670872100 Class: COM

PRICE T ROWE ASSOCIATES INC /MD/'s Holding History (CIK: 0000080255)

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

Q3 2015
Shares 11,250 Value ($000) $370 Avg Close — Range —
Q2 2015
Shares 11,250 Value ($000) $378 Avg Close — Range —
Q1 2015
Shares 11,250 Value ($000) $338 Avg Close — Range —
Q4 2014
Shares 11,250 Value ($000) $335 Avg Close — Range —
Q3 2014
Shares 11,250 Value ($000) $292 Avg Close — Range —
Q2 2014
Shares 11,250 Value ($000) $365 Avg Close — Range —
Q1 2014
Shares 11,250 Value ($000) $374 Avg Close — Range —
Q4 2013
Shares 11,250 Value ($000) $410 Avg Close — Range —
Q3 2013
Shares 11,250 Value ($000) $380 Avg Close — Range —
Q2 2013
Shares 11,250 Value ($000) $348 Avg Close — Range —