Ownership Submission
FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
  Thiel Carsten
 2. Date of Event Requiring Statement (Month/Day/Year)
02/02/2015		 3. Issuer Name and Ticker or Trading Symbol
ALEXION PHARMACEUTICALS INC [ALXN]
(Last)
(First)
(Middle)
C/O ALEXION PHARMACEUTICALS, INC., 352 KNOTTER DRIVE		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
SVP, EMEA & Asia Pacific
 5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

CHESHIRE, CT 06410		 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Common Stock, par value $.0001 per share 26,000 (1)
D
 

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Option to Purchase Common Stock 09/09/2015 09/09/2024 Common Stock, par value $.0001 per share 30,000 (2) $ 161.37 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Thiel Carsten
C/O ALEXION PHARMACEUTICALS, INC.
352 KNOTTER DRIVE
CHESHIRE, CT 06410		       SVP, EMEA & Asia Pacific  

Signatures

/s/ Michael Greco, Attorney-in-Fact for Carsten Thiel 02/12/2015
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Restricted stock units awarded under Amended and Restated 2004 Incentive Plan. These restricted stock units were awarded on September 9, 2014. 14,000 vest on September 9, 2015 and 4,000 on the anniversary thereof until fully vested after four years from the grant date.
(2) Stock options awarded under Amended and Restated 2004 Incentive Plan. These stock options vest 7,500 on September 9, 2015, and 1,875 every three months thereafter until fully vested over 4 years from the grant date

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