OM GROUP INC

CUSIP: 670872100 Class: COM

NISA INVESTMENT ADVISORS, LLC's Holding History (CIK: 0000937615)

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

Q3 2015
Shares 14,000 Value ($000) $460 Avg Close — Range —
Q2 2015
Shares 14,000 Value ($000) $470 Avg Close — Range —
Q1 2015
Shares 14,000 Value ($000) $420 Avg Close — Range —
Q4 2014
Shares 16,700 Value ($000) $498 Avg Close — Range —
Q3 2014
Shares 16,700 Value ($000) $433 Avg Close — Range —
Q2 2014
Shares 16,700 Value ($000) $542 Avg Close — Range —
Q1 2014
Shares 16,700 Value ($000) $555 Avg Close — Range —
Q4 2013
Shares 16,700 Value ($000) $608 Avg Close — Range —
Q3 2013
Shares 16,700 Value ($000) $564 Avg Close — Range —
Q2 2013
Shares 16,700 Value ($000) $516 Avg Close — Range —