ALEXION PHARMACEUTICALS INC filings

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SEC filings by ALEXION PHARMACEUTICALS INC (ownership)
TypeFiledFilerSubjectShares OwnedPercent Owned
SC 13G/A2004-02-18ISALY SAMUEL DALEXION PHARMACEUTICALS INC00.0%EDGAR
SC 13G2004-02-18RS INVESTMENT MANAGEMENT CO LLCALEXION PHARMACEUTICALS INC-8.1%EDGAR
SC 13G/A2004-02-17FMR CORPALEXION PHARMACEUTICALS INC2,223,53710.1%EDGAR
SC 13G/A2004-02-13VIKING GLOBAL PERFORMANCE LLCALEXION PHARMACEUTICALS INC1,970,7009.0%EDGAR
SC 13G2004-02-13SECTORAL ASSET MANAGEMENT INCALEXION PHARMACEUTICALS INC1,913,1688.7%EDGAR
SC 13G2004-02-10OPPENHEIMER FUNDS INCALEXION PHARMACEUTICALS INC2,808,90012.8%EDGAR
SC 13G/A2004-02-03PRICE T ROWE ASSOCIATES INC /MD/ALEXION PHARMACEUTICALS INC1,288,4005.8%EDGAR
SC 13G2003-09-22VIKING GLOBAL PERFORMANC LLCALEXION PHARMACEUTICALS INC2,025,0009.3%EDGAR
SC 13G2003-08-07PICTET & CIE EUROPE SAALEXION PHARMACEUTICALS INC9905.4%EDGAR
SC 13G/A2003-05-02ORBIMED ADVISORS LLCALEXION PHARMACEUTICALS INC1,074,4005.9%EDGAR
SC 13G/A2003-05-02ORBIMED CAPITAL LLCALEXION PHARMACEUTICALS INC1,074,4005.9%EDGAR
SC 13G/A2003-02-14ORBIMED ADVISORS LLCALEXION PHARMACEUTICALS INC797,5004.4%EDGAR
SC 13G/A2003-02-13FMR CORPALEXION PHARMACEUTICALS INC1,839,52610.1%EDGAR
SC 13G/A2003-02-13OPPENHEIMER FUNDS INCALEXION PHARMACEUTICALS INC2,500,00013.7%EDGAR
SC 13G2003-02-03PRICE T ROWE ASSOCIATES INC /MD/ALEXION PHARMACEUTICALS INC1,115,5006.1%EDGAR
SC 13G/A2002-02-15ORBIMED ADVISERS INC /CTALEXION PHARMACEUTICALS INC1,000,0005.5%EDGAR
SC 13G/A2002-02-15ISALY SAMUEL DALEXION PHARMACEUTICALS INC1,000,0005.5%EDGAR
SC 13G/A2002-02-15ORBIMED ADVISORS LLCALEXION PHARMACEUTICALS INC1,000,0005.5%EDGAR
SC 13G/A2002-02-13FRANKLIN RESOURCES INCALEXION PHARMACEUTICALS INC501,3002.8%EDGAR
SC 13G/A2002-02-13FMR CORPALEXION PHARMACEUTICALS INC1,837,92910.1%EDGAR
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