OM GROUP INC

CUSIP: 670872100 Class: COM

DIMENSIONAL FUND ADVISORS LP's Holding History (CIK: 0000354204)

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

Q3 2015
Shares 2,500,067 Value ($000) $82,228 Avg Close — Range —
Q2 2015
Shares 2,593,777 Value ($000) $87,151 Avg Close — Range —
Q1 2015
Shares 2,667,979 Value ($000) $80,120 Avg Close — Range —
Q4 2014
Shares 2,681,630 Value ($000) $79,913 Avg Close — Range —
Q3 2014
Shares 2,710,179 Value ($000) $70,331 Avg Close — Range —
Q2 2014
Shares 2,730,514 Value ($000) $88,550 Avg Close — Range —
Q1 2014
Shares 2,704,639 Value ($000) $89,847 Avg Close — Range —
Q4 2013
Shares 2,788,472 Value ($000) $101,528 Avg Close — Range —
Q3 2013
Shares 2,721,461 Value ($000) $91,930 Avg Close — Range —
Q2 2013
Shares 2,734,705 Value ($000) $84,557 Avg Close — Range —