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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1178670	Alnylam Pharmaceuticals Inc.	ALNY	Pharmaceutical Preparations (2834)	770602661

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1458494	Akshay Vaishnaw	C/O Alnylam Pharmaceuticals, Inc. 300 Third Street Cambridge MA 02139	Evp, R&D, Cmo	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	Acquisiton	2015-03-17	6,250	$9.30	6,250	No	4	M	Direct
Common Stock	Acquisiton	2015-03-17	2,500	$7.10	8,750	No	4	M	Direct
Common Stock	Disposition	2015-03-17	1,224	$115.29	7,526	No	4	S	Direct
Common Stock	Disposition	2015-03-17	3,802	$116.34	3,724	No	4	S	Direct
Common Stock	Disposition	2015-03-17	2,080	$117.35	1,644	No	4	S	Direct
Common Stock	Disposition	2015-03-17	1,000	$118.16	644	No	4	S	Direct
Common Stock	Disposition	2015-03-17	644	$119.38	0	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
No	4	S	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	Stock Option (Right to Buy)	Disposition	2015-03-17	2,500	$0.00	2,500	$7.10
Common Stock	Stock Option (Right to Buy)	Disposition	2015-03-17	6,250	$0.00	6,250	$9.30

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
7,500		2021-11-30	No	4	M	Direct
6,250		2021-06-09	No	4	M	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	82	Indirect	By Managed Account

Footnotes

The sales reported on this Form 4 were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 15, 2013.
Sale prices ranged from $114.96 to $115.81.
Sale prices ranged from $115.96 to $116.95.
Sale prices ranged from $116.97 to $117.72.
Sale prices ranged from $117.98 to $118.97.
Sale prices ranged from $118.99 to $119.98.
The reporting person owns 82 shares of ALNY common stock under the ALNY 401(k) plan as a result of the ALNY 401(k) matching contribution program.
The stock option vests as to 25% of the shares on the first anniversary of the grant date and as to an additional 6.25% of the shares each successive three month period thereafter.