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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	300 Third Street Cambridge MA 02139	Evp, Chief Medical 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	Disposition	2014-01-23	4,698	$89.49	7,890	No	4	F	Direct
Common Stock	Disposition	2014-01-24	1,869	$84.57	6,021	No	4	S	Direct
Common Stock	Disposition	2014-01-24	4,221	$85.77	1,800	No	4	S	Direct
Common Stock	Disposition	2014-01-24	1,100	$86.60	700	No	4	S	Direct
Common Stock	Disposition	2014-01-24	700	$87.44	0	No	4	S	Direct

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

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	2,615	Indirect	by Managed Account

Footnotes

Withholding of shares of common stock to satisfy tax withholding obligations in connection with the vesting of previously awarded restricted stock.
The sales reported on this Form 4 were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 20, 2012.
Sale prices ranged from $84.03 to $85.01.
Sale prices ranged from $85.14 to $86.12.
Sale prices ranged from $86.14 to $86.99.
Sale prices ranged from $87.26 to $87.74.
The reporting person owns 2,615 shares of ALNY common stock under the ALNY 401(k) plan as a result of the ALNY 401(k) matching contribution program.