SC 13G/A | 2004-02-18 | ISALY SAMUEL D | ALEXION PHARMACEUTICALS INC | 0 | 0.0% | EDGAR |
SC 13G | 2004-02-18 | RS INVESTMENT MANAGEMENT CO LLC | ALEXION PHARMACEUTICALS INC | - | 8.1% | EDGAR |
SC 13G/A | 2004-02-17 | FMR CORP | ALEXION PHARMACEUTICALS INC | 2,223,537 | 10.1% | EDGAR |
SC 13G/A | 2004-02-13 | VIKING GLOBAL PERFORMANCE LLC | ALEXION PHARMACEUTICALS INC | 1,970,700 | 9.0% | EDGAR |
SC 13G | 2004-02-13 | SECTORAL ASSET MANAGEMENT INC | ALEXION PHARMACEUTICALS INC | 1,913,168 | 8.7% | EDGAR |
SC 13G | 2004-02-10 | OPPENHEIMER FUNDS INC | ALEXION PHARMACEUTICALS INC | 2,808,900 | 12.8% | EDGAR |
SC 13G/A | 2004-02-03 | PRICE T ROWE ASSOCIATES INC /MD/ | ALEXION PHARMACEUTICALS INC | 1,288,400 | 5.8% | EDGAR |
SC 13G | 2003-09-22 | VIKING GLOBAL PERFORMANC LLC | ALEXION PHARMACEUTICALS INC | 2,025,000 | 9.3% | EDGAR |
SC 13G | 2003-08-07 | PICTET & CIE EUROPE SA | ALEXION PHARMACEUTICALS INC | 990 | 5.4% | EDGAR |
SC 13G/A | 2003-05-02 | ORBIMED ADVISORS LLC | ALEXION PHARMACEUTICALS INC | 1,074,400 | 5.9% | EDGAR |
SC 13G/A | 2003-05-02 | ORBIMED CAPITAL LLC | ALEXION PHARMACEUTICALS INC | 1,074,400 | 5.9% | EDGAR |
SC 13G/A | 2003-02-14 | ORBIMED ADVISORS LLC | ALEXION PHARMACEUTICALS INC | 797,500 | 4.4% | EDGAR |
SC 13G/A | 2003-02-13 | FMR CORP | ALEXION PHARMACEUTICALS INC | 1,839,526 | 10.1% | EDGAR |
SC 13G/A | 2003-02-13 | OPPENHEIMER FUNDS INC | ALEXION PHARMACEUTICALS INC | 2,500,000 | 13.7% | EDGAR |
SC 13G | 2003-02-03 | PRICE T ROWE ASSOCIATES INC /MD/ | ALEXION PHARMACEUTICALS INC | 1,115,500 | 6.1% | EDGAR |
SC 13G/A | 2002-02-15 | ORBIMED ADVISERS INC /CT | ALEXION PHARMACEUTICALS INC | 1,000,000 | 5.5% | EDGAR |
SC 13G/A | 2002-02-15 | ISALY SAMUEL D | ALEXION PHARMACEUTICALS INC | 1,000,000 | 5.5% | EDGAR |
SC 13G/A | 2002-02-15 | ORBIMED ADVISORS LLC | ALEXION PHARMACEUTICALS INC | 1,000,000 | 5.5% | EDGAR |
SC 13G/A | 2002-02-13 | FRANKLIN RESOURCES INC | ALEXION PHARMACEUTICALS INC | 501,300 | 2.8% | EDGAR |
SC 13G/A | 2002-02-13 | FMR CORP | ALEXION PHARMACEUTICALS INC | 1,837,929 | 10.1% | EDGAR |