Markwest Energy Partners L P

Winfield Associates, Inc.

Report date

6/30/2014

Quarter

2014 Q2

Filed

7/28/2014

Shares

5,450

Value ($000)

390

Weight

0.3%

2013 Q4 - 2014 Q2 (3 filings)

Shares History

History scope: non-option holdings only (PUT/CALL rows excluded).

All 13F Holders	Filing date	Value ($000s)	% of Holdings	Shares	Reporting period
2014 Q2	7/28/2014	390	0.3%	5,450	6/30/2014
2014 Q1	5/15/2014	617	0.5%	9,450	3/31/2014
2013 Q4	3/17/2014	718	0.6%	10,850	12/31/2013