FORM 4 [ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

Mollen John T		 2. Issuer Name and Ticker or Trading Symbol

ALEXION PHARMACEUTICALS, INC. [ ALXN ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

__X__ Director                    _____ 10% Owner
_____ Officer (give title below)    _____ Other (specify below)
(Last)          (First)          (Middle)

C/O ALEXION PHARMACEUTICALS, INC, 121 SEAPORT BOULEVARD		 3. Date of Earliest Transaction (MM/DD/YYYY)

5/20/2021
(Street)

BOSTON, MA 02210
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
 6. Individual or Joint/Group Filing (Check Applicable Line)

_X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8) 		4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4) 		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock, par value $.0001 per share 5/20/2021  A  1962 (1)A$0 14663 D  
Common Stock, par value $.0001 per share 5/20/2021  A  673 (2)A$0 15336 D  

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3)		2. Conversion or Exercise Price of Derivative Security3. Trans. Date3A. Deemed Execution Date, if any4. Trans. Code
(Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4)		8. Price of Derivative Security
(Instr. 5)		9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
(1) Award of Restricted Stock Units under the 2017 Incentive Plan. Shares issuable pursuant to the Restricted Stock Units vest in their entirety on the first anniversary of the grant date.
(2) Award of Restricted Stock Units under the 2017 Incentive Plan. Shares issuable pursuant to the Restricted Stock Units vest as to 25% on a quarterly basis. These Restricted Stock Units were issued in lieu ofthe annual cash retainer that the director was entitled to receive for service as a director.
Reporting Owners
Reporting Owner Name / Address
Relationships
Director10% OwnerOfficerOther
Mollen John T
C/O ALEXION PHARMACEUTICALS, INC
121 SEAPORT BOULEVARD
BOSTON, MA 02210		X
Signatures
/s/ Douglas Barry Attorney-in-Fact for John. T. Mollen5/24/2021
**Signature of Reporting PersonDate
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