MarkWest Energy Partners L P: Ownership

Ownership Information
Shares Outstanding 66.00 Mil
Institutional Ownership (%)32.15
Top 10 Institutions (%)22.40
Mutual Fund Ownership (%)2.54
5%/Insider Ownership (%)15.06
Float (%)84.94
Ownership Activity
Description# of HoldersShares
Total Positions 9221,222,136
New Positions150
Soldout Positions600
Net Position Change-33-1,688,244
Buyers494,104,605
Sellers82-5,792,849
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Institution Name Shs Held Shs Chg %Chg $Chg* %Out %Port Rpt Date
Kayne Anderson Capital Advisors, L.P. 5,984,908 713,973 13.5 45,492,360 9.0 4.4 09-30-09
Tortoise Capital Advisors, LLC 2,461,655 -658,634 -21.1 1,379,648 3.7 2.8 09-30-09
Swank Capital, LLC 1,202,700 159,000 15.2 9,424,461 1.8 4.8 09-30-09
Morgan Stanley Investment Management Inc. (US) 1,197,362 374,594 45.5 13,319,286 1.8 0.1 09-30-09
Delta Partners, L.L.C. 802,314 -23,900 -2.9 3,921,585 1.2 8.4 09-30-09
Credit Suisse Securities (USA) LLC 724,290 401,365 124.3 11,237,738 1.1 0.0 09-30-09
Zimmer Lucas Partners, L.L.C. 675,000 431,500 177.2 11,518,550 1.0 3.6 09-30-09
BlackRock Financial Management, Inc. 666,400 0 0.0 3,618,552 1.0 0.0 09-30-09
Cohen & Steers Capital Management, Inc. 534,961 297,961 125.7 8,327,728 0.8 0.1 09-30-09
Mackenzie Financial Corporation 515,100 1,100 0.2 2,817,013 0.8 0.1 09-30-09
RBC Capital Markets Wealth Management 452,351 19,149 4.4 2,804,778 0.7 0.2 09-30-09
Fidelity Management & Research 443,500 266,500 150.6 7,258,505 0.7 0.0 09-30-09
Glickenhaus & Co. 408,742 -5,000 -1.2 2,187,155 0.6 1.3 12-31-09
Wood & Company 395,500 0 0.0 2,147,565 0.6 3.0 09-30-09
Waddell & Reed Investment Management Company 350,100 74,200 26.9 3,251,483 0.5 0.0 09-30-09
*Category Headings:
Shs Held - shares held at report date
Shs Chg - position change within reporting period
%Chg - % change
$Chg - market value of the position change
%Out - % of shares outstanding
%Port - % Portfolio
Rpt Date - report date
Page generated 2/10/2010 12:57 AM Eastern Time