MARKWEST ENERGY PARTNERS L P

CUSIP: 570759100 Class: UNIT LP PARTN

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

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

Q3 2013
Shares 469,741 Value ($000) $33,929 Avg Close — Range —
Q2 2013
Shares 367,611 Value ($000) $24,575 Avg Close — Range —