MERRIMACK PHARMACEUTICALS IN

CUSIP: 590328100 Class: CMN

Magnetar Financial LLC's Holding History (CIK: 0001352851)

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

Q1 2014
Shares 375,000 Value ($000) $1,890 Avg Close — Range —
Q4 2013
Shares 1,226,893 Value ($000) $6,552 Avg Close — Range —
Q3 2013
Shares 1,654,837 Value ($000) $6,288 Avg Close — Range —
Q2 2013
Shares 754,837 Value ($000) $5,080 Avg Close — Range —