MERRIMACK PHARMACEUTICALS IN

CUSIP: 590328100 Class: CMN

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

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

Q4 2016
Shares 3,800 Value ($000) $16 Avg Close — Range —
Q3 2016
Shares 3,800 Value ($000) $24 Avg Close — Range —
Q2 2016
Shares 1,700 Value ($000) $9 Avg Close — Range —
Q1 2016
Shares 1,700 Value ($000) $14 Avg Close — Range —