SEC Form 3

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 or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL OMB Number: 3235-0104 Estimated average burden hours per response: 0.5

1. Name and Address of Reporting Person* Wagner Heidi L (Last) (First) (Middle) C/O ALEXION PHARMACEUTICALS, INC 352 KNOTTER DRIVE (Street) CHESHIRE CT 06410 (City) (State) (Zip)	2. Date of Event Requiring Statement (Month/Day/Year) 10/01/2015	3. Issuer Name and Ticker or Trading Symbol ALEXION PHARMACEUTICALS INC [ ALXN ]
		4. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director 10% Owner X Officer (give title below) Other (specify below) SVP, Global Government Affairs	5. If Amendment, Date of Original Filed (Month/Day/Year)
			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 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	25,916	D

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: 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	05/02/2011	02/02/2021	Common Stock, par value $.0001 per share	9,500	$42.655	D
Option to Purchase Common Stock	05/03/2012	02/03/2022	Common Stock, par value $.0001 per share	14,000	$78.88	D
Option to Purchase Common Stock	02/12/2013	11/12/2022	Common Stock, par value $.0001 per share	3,000	$91.98	D
Option to Purchase Common Stock	05/06/2013	02/06/2023	Common Stock, par value $.0001 per share	18,807	$93.83	D
Option to Purchase Common Stock	02/28/2015	02/28/2024	Common Stock, par value $.0001 per share	20,000	$176.8	D
Option to Purchase Common Stock	02/27/2016	02/27/2025	Common Stock, par value $.0001 per share	15,000	$180.37	D
Option to Purchase Common Stock	10/01/2016	10/01/2025	Common Stock, par value $.0001 per share	5,000	$157.82	D

Explanation of Responses:

Remarks:

	/s/ Michael V. Greco, Attorney-in-fact for Heidi L. Wagner	10/08/2015
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.