Markwest Energy Partners L P

Heronetta Management, L.P.

Report date

3/31/2014

Quarter

2014 Q1

Filed

5/12/2014

Shares

145,720

Value ($000)

9,518

Weight

4.4%

2013 Q4 - 2014 Q1 (2 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 Q1	5/12/2014	9,518	4.4%	145,720	3/31/2014
2013 Q4	1/24/2014	9,504	4.7%	143,720	12/31/2013