ALEXION PHARMACEUTICALS INC filings

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SEC filings by ALEXION PHARMACEUTICALS INC (ownership)
TypeFiledFilerSubjectShares OwnedPercent Owned
SC 13G/A2006-02-08OPPENHEIMER FUNDS INCALEXION PHARMACEUTICALS INC2000.0%EDGAR
SC 13G/A2006-02-08DUQUESNE CAPITAL MANAGEMENT L L CALEXION PHARMACEUTICALS INC203,5220.7%EDGAR
SC 13G/A2005-12-09FEDERATED INVESTORS INC /PA/ALEXION PHARMACEUTICALS INC2,4030.0%EDGAR
SC 13G2005-11-30CITADEL L PALEXION PHARMACEUTICALS INC1,940,704-EDGAR
SC 13G2005-11-29PICTET & CIE EUROPE SAALEXION PHARMACEUTICALS INC15.3%EDGAR
SC 13G2005-10-21DUQUESNE CAPITAL MANAGEMENT L L CALEXION PHARMACEUTICALS INC1,642,9365.3%EDGAR
SC 13G2005-07-19BAKER FELIXALEXION PHARMACEUTICALS INC1,613,0275.5%EDGAR
SC 13G/A2005-02-15PRICE T ROWE ASSOCIATES INC /MD/ALEXION PHARMACEUTICALS INC2,182,6007.9%EDGAR
SC 13G/A2005-02-15OPPENHEIMER FUNDS INCALEXION PHARMACEUTICALS INC2,518,4009.1%EDGAR
SC 13G/A2005-02-15VIKING GLOBAL PERFORMANCE LLCALEXION PHARMACEUTICALS INC00.0%EDGAR
SC 13G/A2005-02-14FMR CORPALEXION PHARMACEUTICALS INC2,708,5909.7%EDGAR
SC 13G/A2005-02-14RS INVESTMENT MANAGEMENT CO LLCALEXION PHARMACEUTICALS INC-6.1%EDGAR
SC 13G/A2005-02-14SECTORAL ASSET MANAGEMENT INCALEXION PHARMACEUTICALS INC1,917,6926.9%EDGAR
SC 13G/A2005-02-14SAC CAPITAL ADVISORS LLCALEXION PHARMACEUTICALS INC30,1500.1%EDGAR
SC 13G2005-02-14FEDERATED INVESTORS INC /PA/ALEXION PHARMACEUTICALS INC1,455,8855.3%EDGAR
SC 13G/A2005-02-08PRICE T ROWE ASSOCIATES INC /MD/ALEXION PHARMACEUTICALS INC2,182,6007.9%EDGAR
SC 13G2005-02-04ZIFF ASSET MANAGEMENT LPALEXION PHARMACEUTICALS INC1,677,7736.0%EDGAR
SC 13G2005-01-07SAC CAPITAL ADVISORS LLCALEXION PHARMACEUTICALS INC38,1505.3%EDGAR
SC 13G/A2004-02-18ORBIMED ADVISORS LLCALEXION PHARMACEUTICALS INC00.0%EDGAR
SC 13G/A2004-02-18ORBIMED CAPITAL LLCALEXION PHARMACEUTICALS INC00.0%EDGAR
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