Notable Holders of Alexion Pharmaceuticals, Inc. (ALXN)
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* Does Not Fully Represent All Holders
| Fund | Title | Shares | % Owned | Source |
|---|---|---|---|---|
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | 59,104,877 | 31.92% | 13F | |
| Fidelity Investments | COM | 23,227,973 | 12.55% | 13F |
| PRICE T ROWE ASSOCIATES INC /MD/ | COMM STK | 14,434,992 | 7.80% | 13F |
| SANDS CAPITAL MANAGEMENT, LLC | 8,771,444 | 4.74% | 13F | |
| VANGUARD GROUP INC | COM | 7,393,766 | 3.99% | 13F |
| WELLS FARGO & CO/MN | EQUITY | 6,928,991 | 3.74% | 13F |
| COLUMBIA WANGER ASSET MANAGEMENT LLC | COM | 6,284,308 | 3.39% | 13F |
| AMERIPRISE FINANCIAL INC | COM | 4,955,396 | 2.68% | 13F |
| BlackRock Institutional Trust Company, N.A. | COM | 4,043,340 | 2.18% | 13F |
| UBS GLOBAL ASSET MANAGEMENT AMERICAS INC | EQTY US OTC | 3,563,921 | 1.92% | 13F |
| JPMORGAN CHASE & CO | COMMON | 2,907,071 | 1.57% | 13F |
| BlackRock Fund Advisors | COM | 2,482,263 | 1.34% | 13F |
| JANUS CAPITAL MANAGEMENT LLC | COM | 2,266,874 | 1.22% | 13F |
| TIAA CREF INVESTMENT MANAGEMENT LLC | COM | 2,179,893 | 1.18% | 13F |
| TURNER INVESTMENT PARTNERS INC | COM | 1,870,903 | 1.01% | 13F |
| GILDER GAGNON HOWE & CO LLC | COM | 1,578,888 | 0.85% | 13F |
| BANK OF AMERICA CORP /DE/ | 1,510,276 | 0.82% | 13F | |
| Artisan Partners Limited Partnership | COM | 1,493,300 | 0.81% | 13F |
| DEUTSCHE BANK AG\ | COM | 1,312,813 | 0.71% | 13F |
| ROYAL BANK OF CANADA \ | COM | 1,274,860 | 0.69% | 13F |
| RAINIER INVESTMENT MANAGEMENT INC/ | COM | 1,191,410 | 0.64% | 13F |
| Goldman Sachs Asset Management, L.P. | CMN | 1,187,745 | 0.64% | 13F |
| NORTHERN TRUST CORP | COM | 1,135,678 | 0.61% | 13F |
| Invesco Ltd. | COMMON | 1,097,405 | 0.59% | 13F |
| BlackRock Group LTD | COM | 1,072,697 | 0.58% | 13F |
| BLACKROCK ADVISORS LLC | COM | 997,707 | 0.54% | 13F |
| WESTFIELD CAPITAL MANAGEMENT CO LP | COM | 898,817 | 0.49% | 13F |
| Century Capital Management, LLC | COM | 808,897 | 0.44% | 13F |
| Ionic Capital Management LLC (PUT) | COM | 781,500 | 0.42% | 13F |
| Goodman & Company, Investment Counsel Ltd. | COM | 775,100 | 0.42% | 13F |
| ANALYTIC INVESTORS INC/CA | 720,157 | 0.39% | 13F | |
| Viking Global Investors | COM | 711,800 | 0.38% | 13F |
| Sumitomo Mitsui Trust Holdings, Inc. | COM | 653,928 | 0.35% | 13F |
| STATE OF WISCONSIN INVESTMENT BOARD | COM | 651,314 | 0.35% | 13F |
| LEGAL & GENERAL GROUP PLC | COM | 624,208 | 0.34% | 13F |
| GEODE CAPITAL MANAGEMENT LLC | COM | 577,641 | 0.31% | 13F |
| MORGAN STANLEY | COM | 576,163 | 0.31% | 13F |
| TEACHERS ADVISORS INC | COM | 558,828 | 0.30% | 13F |
| NorthCoast Asset Management LLC | COM | 531,811 | 0.29% | 13F |
| Neuberger Berman Group LLC | COMMON STOCK | 529,356 | 0.29% | 13F |
| MASON STREET ADVISORS LLC | COM | 466,700 | 0.25% | 13F |
| CADENCE CAPITAL MANAGEMENT LLC | COM | 464,115 | 0.25% | 13F |
| BNP Paribas Investment Partners S.A. | COM | 446,193 | 0.24% | 13F |
| CALIFORNIA PUBLIC EMPLOYEES RETIREMENT SYSTEM | * ALEXION | 441,830 | 0.24% | 13F |
| ORACLE INVESTMENT MANAGEMENT INC | COM | 395,932 | 0.21% | 13F |
| PIONEER INVESTMENT MANAGEMENT INC | COMMSTCK | 395,802 | 0.21% | 13F |
| IRONBRIDGE CAPITAL MANAGEMENT LP | COM | 381,730 | 0.21% | 13F |
| TWO SIGMA INVESTMENTS LLC | COM | 379,314 | 0.20% | 13F |
| THRIVENT FINANCIAL FOR LUTHERANS | COM | 377,900 | 0.20% | 13F |
| CNH PARTNERS LLC | COM | 374,970 | 0.20% | 13F |
| Mitsubishi UFJ Trust & Banking Corp | COM | 366,123 | 0.20% | 13F |
| RENAISSANCE TECHNOLOGIES LLC | COM | 365,352 | 0.20% | 13F |
| MARVIN & PALMER ASSOCIATES INC | COM | 363,300 | 0.20% | 13F |
| GREAT WEST LIFE ASSURANCE CO /CAN/ | COM | 346,000 | 0.19% | 13F |
| FRANKLIN RESOURCES INC | 339,530 | 0.18% | 13F | |
| DRIEHAUS CAPITAL MANAGEMENT LLC | COM | 334,644 | 0.18% | 13F |
| JENNISON ASSOCIATES LLC | COM | 331,348 | 0.18% | 13F |
| MANAGED ACCOUNT ADVISORS LLC | 328,313 | 0.18% | 13F | |
| SUNTRUST BANKS INC | M | 323,934 | 0.17% | 13F |
| Alyeska Investment Group, L.P. | COM | 308,741 | 0.17% | 13F |
| BlackRock Investment Management, LLC | COM | 300,063 | 0.16% | 13F |
| EULAV ASSET MANAGEMENT, LLC | COM | 293,600 | 0.16% | 13F |
| Mizuho Trust & Banking Co., Ltd. | COM | 291,991 | 0.16% | 13F |
| BlackRock Japan Co. Ltd | COM | 283,332 | 0.15% | 13F |
| TD ASSET MANAGEMENT INC | COM | 268,024 | 0.14% | 13F |
| OPPENHEIMER FUNDS INC | COM | 265,650 | 0.14% | 13F |
| SCHWAB CHARLES INVESTMENT MANAGEMENT INC | COM | 263,260 | 0.14% | 13F |
| OrbiMed Advisors | COM | 220,200 | 0.12% | 13F |
| DE BURLO GROUP INC | COM | 211,500 | 0.11% | 13F |
| LOS ANGELES CAPITAL MANAGEMENT & EQUITY RESEARCH INC | COM | 209,842 | 0.11% | 13F |
| RUSSELL FRANK CO/ | COMMON STOCKS | 209,365 | 0.11% | 13F |
| PARAMETRIC PORTFOLIO ASSOCIATES | Common Stock | 207,209 | 0.11% | 13F |
| FORT WASHINGTON INVESTMENT ADVISORS INC /OH/ | COMMON STOCK | 204,075 | 0.11% | 13F |
| Redwood Investments, LLC | COM | 192,448 | 0.10% | 13F |
| AMERICAN INTERNATIONAL GROUP INC | COM | 189,497 | 0.10% | 13F |
| AQR CAPITAL MANAGEMENT LLC | COM | 184,500 | 0.10% | 13F |
| MADISON SQUARE INVESTORS LLC. | COM | 184,261 | 0.10% | 13F |
| Wellington | COM | 166,900 | 0.09% | 13F |
| NEW YORK STATE COMMON RETIREMENT FUND | COMMON STOCK | 157,274 | 0.08% | 13F |
| CREDIT SUISSE AG/ | COM | 146,838 | 0.08% | 13F |
| PALISADE CAPITAL MANAGEMENT LLC/NJ | COM | 146,003 | 0.08% | 13F |
| KAYNE ANDERSON RUDNICK INVESTMENT MANAGEMENT LLC | COMMON STOCKS | 144,686 | 0.08% | 13F |
| PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO | COM | 143,077 | 0.08% | 13F |
| GUGGENHEIM CAPITAL LLC | COM | 139,767 | 0.08% | 13F |
| DIMENSIONAL FUND ADVISORS LP | COM | 139,424 | 0.08% | 13F |
| BARCLAYS PLC (CALL) | OPT | 138,900 | 0.08% | 13F |
| MCKINLEY CAPITAL MANAGEMENT LLC /DELAWARE | COM | 133,014 | 0.07% | 13F |
| BlackRock Inc. | COM | 123,736 | 0.07% | 13F |
| ING INVESTMENT MANAGEMENT CO | COM | 120,280 | 0.06% | 13F |
| Premier Asset Managment LLC | COM | 116,380 | 0.06% | 13F |
| ALGER FRED MANAGEMENT INC | COMMON | 116,072 | 0.06% | 13F |
| SAC Capital | COMMON | 109,156 | 0.06% | 13F |
| RAYMOND JAMES & ASSOCIATES | COM | 97,608 | 0.05% | 13F |
| IBM Retirement Fund | 015351109 | 97,237 | 0.05% | 13F |
| LEUTHOLD WEEDEN CAPITAL MANAGEMENT | COM | 95,894 | 0.05% | 13F |
| UNITED SERVICES AUTOMOBILE ASSOCIATION | COMMON | 95,238 | 0.05% | 13F |
| HERNDON CAPITAL MANAGEMENT | COMMON STOCK | 93,936 | 0.05% | 13F |
| CITIGROUP INC (CALL) | COM | 89,100 | 0.05% | 13F |
| MOORE CAPITAL MANAGEMENT, LP | COM | 86,698 | 0.05% | 13F |
| OXFORD ASSET MANAGEMENT | COM | 84,965 | 0.05% | 13F |
| RS INVESTMENT MANAGEMENT CO LLC | COM | 80,240 | 0.04% | 13F |
| 300 NORTH CAPITAL, LLC | COM | 79,671 | 0.04% | 13F |
| DIAMONDBACK CAPITAL MANAGEMENT, LLC | COM | 75,245 | 0.04% | 13F |
| PRINCIPAL FINANCIAL GROUP INC | COM | 72,781 | 0.04% | 13F |
| Timber Hill LLC (CALL) | CALL | 66,100 | 0.04% | 13F |
| DAI ICHI LIFE INSURANCE CO., LTD. | COM | 66,058 | 0.04% | 13F |
| GREEN ARROW CAPITAL MANAGEMENT LLC | COM | 65,300 | 0.04% | 13F |
| CAXTON ASSOCIATES LP | COM | 64,899 | 0.04% | 13F |
| BMO FINANCIAL CORP | COM | 62,406 | 0.03% | 13F |
| Irish Life Investment Managers | COM | 61,176 | 0.03% | 13F |
| Highbridge Capital | COMMON | 57,811 | 0.03% | 13F |
| ING Investment Management (Europe) B.V. | COM | 57,128 | 0.03% | 13F |
| FIFTH THIRD BANCORP | COM | 56,587 | 0.03% | 13F |
| Clearbridge Advisors, LLC | COM | 55,992 | 0.03% | 13F |
| CREDIT AGRICOLE S A | COM | 55,537 | 0.03% | 13F |
| REGIONS FINANCIAL CORP | COM | 49,280 | 0.03% | 13F |
| NOMURA ASSET MANAGEMENT CO LTD | 48,820 | 0.03% | 13F | |
| BAIRD ROBERT W & CO INC /WI/ | COMMON | 47,450 | 0.03% | 13F |
| OMERS ADMINISTRATION CORP | COM | 47,300 | 0.03% | 13F |
| Santa Fe Partners LLC | COM | 45,765 | 0.02% | 13F |
| TWO SIGMA ADVISERS, LLC | COM | 45,510 | 0.02% | 13F |
| MILLENNIUM MANAGEMENT LLC | COM | 45,034 | 0.02% | 13F |
| COMERICA BANK | COM | 44,081 | 0.02% | 13F |
| WASHINGTON CAPITAL MANAGEMENT INC | COM | 43,393 | 0.02% | 13F |
| DIAM Co., Ltd. | COM | 43,010 | 0.02% | 13F |
| BENDER ROBERT & ASSOCIATES | COM | 40,313 | 0.02% | 13F |
| Evercore Wealth Management, LLC | COM | 40,020 | 0.02% | 13F |
| GENERAL ELECTRIC CO | COM | 36,976 | 0.02% | 13F |
| CURIAN CAPITAL LLC | COM | 33,794 | 0.02% | 13F |
| ROYAL LONDON ASSET MANAGEMENT LTD | COM | 33,473 | 0.02% | 13F |
| DENVER INVESTMENT ADVISORS LLC | COMMON | 33,401 | 0.02% | 13F |
| NEXT CENTURY GROWTH INVESTORS LLC | 32,770 | 0.02% | 13F | |
| CAPITAL MANAGEMENT ASSOCIATES INC | COM | 31,135 | 0.02% | 13F |
| HSBC HOLDINGS PLC | 30,882 | 0.02% | 13F | |
| PERCEPTIVE ADVISORS LLC | COM | 30,000 | 0.02% | 13F |
| CAISSE DE DEPOT ET PLACEMENT DU QUEBEC | COMMON | 29,004 | 0.02% | 13F |
| Newfleet Asset Management, LLC | COM | 27,362 | 0.01% | 13F |
| ARONSON & JOHNSON & ORTIZ, LP | COM | 27,100 | 0.01% | 13F |
| OPPENHEIMER & CO INC | COM | 26,464 | 0.01% | 13F |
| INSIGHT CAPITAL RESEARCH & MANAGEMENT INC | cs | 24,997 | 0.01% | 13F |
| SG Americas Securities, LLC | 24,522 | 0.01% | 13F | |
| World Asset Management Inc | COM | 24,481 | 0.01% | 13F |
| GAM Holding Ltd. | 22,058 | 0.01% | 13F | |
| FIRST TRUST ADVISORS LP | COM | 21,770 | 0.01% | 13F |
| LEAVELL INVESTMENT MANAGEMENT, INC. | COM | 21,700 | 0.01% | 13F |
| OLD MUTUAL ASSET MANAGERS UK LTD | COM | 20,549 | 0.01% | 13F |
| Spot Trading L.L.C (CALL) | COM | 20,500 | 0.01% | 13F |
| ALLSTATE CORP | COMMON | 20,480 | 0.01% | 13F |
| TOCQUEVILLE ASSET MANAGEMENT LP | COM | 19,500 | 0.01% | 13F |
