MERRIMACK PHARMACEUTICALS IN

CUSIP: 590328100 Class: CMN

GROUP ONE TRADING, L.P.'s Holding History (CIK: 0000932540)

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

Q2 2017
Shares 79,719 Value ($000) $99 Avg Close — Range —
Q1 2017
Shares 110,976 Value ($000) $342 Avg Close — Range —
Q4 2016
Shares 59,286 Value ($000) $242 Avg Close — Range —
Q3 2016
Shares 62,819 Value ($000) $399 Avg Close — Range —
Q2 2016
Shares 17,432 Value ($000) $94 Avg Close — Range —
Q3 2015
Shares 106,340 Value ($000) $905 Avg Close — Range —
Q2 2015
Shares 13,603 Value ($000) $168 Avg Close — Range —
Q2 2014
Shares 13,821 Value ($000) $101 Avg Close — Range —
Q1 2014
Shares 238,467 Value ($000) $1,202 Avg Close — Range —
Q4 2013
Shares 23,205 Value ($000) $124 Avg Close — Range —
Q3 2013
Shares 28,973 Value ($000) $110 Avg Close — Range —