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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
1414815	Martin Mackay	C/O Alexion Pharmaceuticals, Inc 100 College Street New Haven CT 06510	Evp & Global Head Of R&D	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	Disposition	2017-02-27	860	$131.20	38,883	No	4	S	Direct
Common Stock, Par Value $.0001 Per Share	Disposition	2017-02-28	625	$131.70	38,258	No	4	S	Direct
Common Stock, Par Value $.0001 Per Share	Acquisiton	2017-02-28	12,800	$0.00	51,058	No	4	A	Direct
Common Stock, Par Value $.0001 Per Share	Disposition	2017-03-01	370	$132.50	50,688	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	S	Direct
No	4	S	Direct
No	4	A	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	Acquisiton	2017-02-28	12,800	$0.00	12,800	$131.25

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
12,800	2018-02-28	2027-02-28	No	4	A	Direct

Footnotes

This sale was made to cover withholding taxes immediately following the vesting of previously granted Restricted Stock Units.
This transaction was executed in multiple trades through a broker-dealer at prices ranging from $131.00 - $131.99. 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.
Award of Restricted Stock Units under the 2004 Incentive Plan. 25% vests on each anniversary of the grant date.
This transaction was executed in multiple trades through a broker-dealer at prices ranging from $132.00 - $132.99. 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.
Stock option award under 2004 Incentive Plan. 25% vest on the first anniversary of the grant date, 1/16 every three months thereafter until fully vested over 4 years.