Form 4 - Statement of changes in beneficial ownership of securities:
SEC Accession No. 0001638599-16-000873
Filing Date
2016-05-13
Accepted
2016-05-13 16:02:16
Documents
1
Period of Report
2016-05-11

Document Format Files

Seq Description Document Type Size
1 PRIMARY DOCUMENT doc4_3942.html 4  
1 PRIMARY DOCUMENT doc4_3942.xml 4 23545
  Complete submission text file 0001638599-16-000873.txt   27602
Mailing Address 100 COLLEGE STREET NEW HAVEN CT 06510
Business Address 100 COLLEGE STREET NEW HAVEN CT 06510 2032722596
ALEXION PHARMACEUTICALS INC (Issuer) CIK: 0000899866 (see all company filings)

EIN.: 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: 4 | Act: 34 | File No.: 000-27756 | Film No.: 161648272

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: 4 | Act: 34 | File No.: 000-27756 | Film No.: 161648273

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: 4 | Act: 34 | File No.: 000-27756 | Film No.: 161648268

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: 4 | Act: 34 | File No.: 000-27756 | Film No.: 161648269

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: 4 | Act: 34 | File No.: 000-27756 | Film No.: 161648270

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: 4 | Act: 34 | File No.: 000-27756 | Film No.: 161648271