Thoratec Corp: Ownership

Ownership Information
Shares Outstanding 57.00 Mil
Institutional Ownership (%)90.54
Top 10 Institutions (%)43.70
Mutual Fund Ownership (%)7.36
5%/Insider Ownership (%)1.79
Float (%)98.21
Ownership Activity
Description# of HoldersShares
Total Positions 20551,608,040
New Positions320
Soldout Positions1120
Net Position Change-76-3,271,032
Buyers1117,441,492
Sellers187-10,712,524
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Institution Name Shs Held Shs Chg %Chg $Chg* %Out %Port Rpt Date
Fidelity Management & Research 8,391,176 1,214,287 16.9 61,803,812 14.8 0.1 09-30-09
BlackRock Institutional Trust Company, N.A. 3,847,376 376,140 10.8 23,500,372 6.8 0.0 09-30-09
Eagle Asset Management, Inc. 2,297,445 -53,887 -2.3 6,574,989 4.0 0.9 09-30-09
Vanguard Group, Inc. 2,249,653 -69,034 -3.0 6,002,558 4.0 0.0 09-30-09
State Street Global Advisors (US) 1,645,625 278,746 20.4 13,208,049 2.9 0.0 09-30-09
TCW Asset Management Company 1,615,674 -68,710 -4.1 3,798,648 2.8 0.2 09-30-09
Fred Alger Management, Inc. 1,582,455 229,496 17.0 11,668,671 2.8 0.5 09-30-09
Columbus Circle Investors 1,209,785 143,524 13.5 8,065,722 2.1 0.3 09-30-09
Visium Capital Management 1,042,294 505,444 94.2 17,173,396 1.8 3.6 09-30-09
Tocqueville Asset Management LP 1,035,518 74,291 7.7 -1,220,196 1.8 0.5 12-31-09
J.P. Morgan Investment Management Inc. (New York) 833,983 254,373 43.9 9,722,709 1.5 0.0 09-30-09
Calamos Advisors LLC 800,000 0 0.0 2,792,000 1.4 0.1 09-30-09
The Boston Company Asset Management, LLC 782,074 -20,338 -2.5 -3,235,579 1.4 0.1 12-31-09
Emerald Advisers, Inc. 679,412 105,035 18.3 5,183,985 1.2 1.3 09-30-09
Diamondback Capital Management, L.L.C. 659,073 438,131 198.3 14,033,313 1.2 0.4 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 2:25 AM Eastern Time