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Form 3 - Initial statement of beneficial ownership of securities:
SEC Accession No. 0001144204-15-038941
Filing Date
2015-06-24
Accepted
2015-06-24 19:03:55
Documents
1
Period of Report
2015-06-22

Document Format Files

Seq Description Document Type Size
1 form334230_20150624070114-.html 3  
1 form334230_20150624070114-.xml 3 7355
  Complete submission text file 0001144204-15-038941.txt   11389
Mailing Address 352 KNOTTER DRIVE CHESHIRE CT 06511
Business Address 352 KNOTTER DRIVE CHESHIRE CT 06511 2037761790
ALEXION PHARMACEUTICALS INC (Issuer) CIK: 0000899866 (see all company filings)

IRS No.: 133648318 | State of Incorp.: DE | Fiscal Year End: 1231
SIC: 2834 Pharmaceutical Preparations

Mailing Address BAKER BROTHERS ADVISORS 667 MADISON AVENUE, 21ST FLOOR NEW YORK NY 10065
Business Address
BAKER JULIAN (Reporting) CIK: 0001087939 (see all company filings)

Type: 3 | Act: 34 | File No.: 000-27756 | Film No.: 15950262

Mailing Address BAKER BROTHERS ADVISORS 667 MADISON AVENUE, 21ST FLOOR NEW YORK NY 10065
Business Address
BAKER FELIX (Reporting) CIK: 0001087940 (see all company filings)

Type: 3 | Act: 34 | File No.: 000-27756 | Film No.: 15950263

Mailing Address 667 MADISON AVE 21ST FLOOR NEW YORK NY 10065
Business Address 667 MADISON AVE 21ST FLOOR NEW YORK NY 10065 2123395600
BAKER BROS. ADVISORS LP (Reporting) CIK: 0001263508 (see all company filings)

State of Incorp.: DE | Fiscal Year End: 1231
Type: 3 | Act: 34 | File No.: 000-27756 | Film No.: 15950261

Mailing Address 667 MADISON AVENUE 21ST FLOOR NEW YORK NY 10065
Business Address 667 MADISON AVENUE 21ST FLOOR NEW YORK NY 10065 212-339-5633
Baker Brothers Life Sciences LP (Reporting) CIK: 0001363364 (see all company filings)

State of Incorp.: DE | Fiscal Year End: 1231
Type: 3 | Act: 34 | File No.: 000-27756 | Film No.: 15950258

Mailing Address 667 MADISON AVE. 21ST FLOOR NEW YORK NY 10065
Business Address 667 MADISON AVE. 21ST FLOOR NEW YORK NY 10065 212-339-5600
667, L.P. (Reporting) CIK: 0001551139 (see all company filings)

State of Incorp.: DE | Fiscal Year End: 1231
Type: 3 | Act: 34 | File No.: 000-27756 | Film No.: 15950259

Mailing Address 667 MADISON AVENUE 21ST FLOOR NEW YORK NY 10065
Business Address 667 MADISON AVENUE 21ST FLOOR NEW YORK NY 10065 (212)339-5600
Baker Bros. Advisors (GP) LLC (Reporting) CIK: 0001580575 (see all company filings)

State of Incorp.: E9 | Fiscal Year End: 1231
Type: 3 | Act: 34 | File No.: 000-27756 | Film No.: 15950260