MARKWEST ENERGY PARTNERS L P

CUSIP: 570759100 Class: UNIT LP PARTN

NATIXIS ADVISORS, L.P.'s Holding History (CIK: 0001018331)

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

Q1 2014
Shares 12,809 Value ($000) $837 Avg Close — Range —
Q4 2013
Shares 13,353 Value ($000) $883 Avg Close — Range —
Q3 2013
Shares 12,011 Value ($000) $868 Avg Close — Range —