MARKWEST ENERGY PARTNERS L P

CUSIP: 570759100 Class: UNIT LP PARTN

MASSACHUSETTS FINANCIAL SERVICES CO /MA/'s Holding History (CIK: 0000912938)

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

Q1 2015
Shares 416,243 Value ($000) $27,513,662 Avg Close — Range —
Q4 2014
Shares 717,809 Value ($000) $48,229,587 Avg Close — Range —
Q3 2014
Shares 583,231 Value ($000) $44,804 Avg Close — Range —
Q2 2014
Shares 501,702 Value ($000) $35,912 Avg Close — Range —
Q1 2014
Shares 376,370 Value ($000) $24,584,488 Avg Close — Range —