BlackRock MuniYield Insured Fund: Ownership

Ownership Information
Shares Outstanding 67.00 Mil
Institutional Ownership (%)3.57
Top 10 Institutions (%)3.10
Mutual Fund Ownership (%).00
5%/Insider Ownership (%).00
Float (%).00
Ownership Activity
Description# of HoldersShares
Total Positions 382,392,463
New Positions90
Soldout Positions180
Net Position Change-18-237,852
Buyers14482,460
Sellers32-720,312
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Institution Name Shs Held Shs Chg %Chg $Chg* %Out %Port Rpt Date
Van Kampen Asset Management 489,408 -19,271 -3.8 466,253 0.7 0.0 09-30-09
Bank of America Merrill Lynch (US) 458,235 -30,516 -6.2 294,868 0.7 0.0 09-30-09
Morgan Stanley Smith Barney LLC 311,776 311,776 100.0 3,978,262 0.5 0.0 09-30-09
Claymore Advisors, LLC 168,800 -35,792 -17.5 -170,277 0.3 0.0 09-30-09
UBS Securities LLC 158,802 -1,870 -1.2 201,080 0.2 0.0 09-30-09
Wells Fargo Securities, LLC 153,110 15,286 11.1 388,003 0.2 0.0 09-30-09
Sit Investment Associates, Inc. 144,800 -49,600 -25.5 -705,296 0.2 0.1 12-31-09
CNA Insurance Companies 116,400 0 0.0 162,960 0.2 0.2 09-30-09
TFS Capital, L.L.C. 60,168 60,168 100.0 767,744 0.1 0.1 09-30-09
Wolverine Asset Management, L.L.C. 37,491 -8,633 -18.7 -128,902 0.1 0.0 12-31-09
Columbia Management Advisors, LLC 32,593 -622 -1.9 38,565 0.0 0.0 09-30-09
Evergreen Investment Management Company, LLC 31,466 -1,000 -3.1 32,692 0.0 0.0 09-30-09
Millennium Management, L.L.C. 23,200 23,200 100.0 296,032 0.0 0.0 09-30-09
Newgate Capital Management LLC 22,682 22,682 100.0 278,081 0.0 0.0 12-31-09
Armstrong Shaw Associates, Inc. 20,000 -1,300 -6.1 -26,588 0.0 0.0 12-31-09
*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 9:28 AM Eastern Time