MERRIMACK PHARMACEUTICALS IN

CUSIP: 590328100 Class: CMN

WESTFIELD CAPITAL MANAGEMENT CO LP's Holding History (CIK: 0001177719)

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

Q4 2016
Shares 9,072,877 Value ($000) $37,017 Avg Close — Range —
Q3 2016
Shares 8,894,008 Value ($000) $56,477 Avg Close — Range —
Q2 2016
Shares 9,074,557 Value ($000) $48,912 Avg Close — Range —
Q1 2016
Shares 8,127,022 Value ($000) $68,023 Avg Close — Range —
Q4 2015
Shares 7,255,815 Value ($000) $57,321 Avg Close — Range —
Q3 2015
Shares 6,511,561 Value ($000) $55,413 Avg Close — Range —
Q2 2015
Shares 4,881,667 Value ($000) $60,362 Avg Close — Range —
Q1 2015
Shares 2,903,559 Value ($000) $34,494 Avg Close — Range —
Q3 2013
Shares 1,409,870 Value ($000) $5,343 Avg Close — Range —
Q2 2013
Shares 1,491,850 Value ($000) $10,055 Avg Close — Range —