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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
899866	Alexion Pharmaceuticals Inc	ALXN	Pharmaceutical Preparations (2834)	133648318

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1231954	P Stephen Squinto	C/O Alexion Pharmaceuticals Inc 352 Knotter Drive Cheshire CT 06410	Evp, Global Ops. Officer	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Stock, Par Value $.0001 Per Share	Acquisiton	2013-04-29	16,499	$22.90	124,961	No	4	M	Direct
Common Stock, Par Value $.0001 Per Share	Acquisiton	2013-04-29	20,000	$42.66	144,961	No	4	M	Direct
Common Stock, Par Value $.0001 Per Share	Disposition	2013-04-29	36,299	$98.96	108,662	No	4	S	Direct
Common Stock, Par Value $.0001 Per Share	Disposition	2013-04-29	200	$99.51	108,462	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
No	4	M	Direct
No	4	S	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock, Par Value $.0001 Per Share	Option to Purchase Common Stock	Disposition	2013-04-29	16,499	$22.90	16,499	$22.90
Common Stock, Par Value $.0001 Per Share	Option to Purchase Common Stock	Disposition	2013-04-29	20,000	$42.66	20,000	$42.66

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
18,999	2010-04-28	2020-01-28	No	4	M	Direct
30,000	2011-05-02	2021-02-02	No	4	M	Direct

Footnotes

The transactions reported by this Form 4 are made pursuant to the terms of a sales plan designed to meet the requirements of Rule 10b5-1(c)(1) of the Securities Exchange Act.
This transaction was executed in multiple trades through a broker-dealer at prices ranging from $98.48 - $99.48. The price reported in this column reflects the weighted average sales price. Upon request, the reporting person will provide to the SEC staff full information regarding the number of shares sold at each price.
This transaction was executed in multiple trades through a broker-dealer at prices ranging from $99.51 - $100.51. The price reported in this column reflects the weighted average sales price. Upon request, the reporting person will provide to the SEC staff full information regarding the number of shares sold at each price.