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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1650664	Editas Medicine Inc.	EDIT	()	DE

Insiders

Cik	Name	Reported Address	Director	Officer	Large Shareholder	Other
1493463	Polaris Venture Partners Vi, L.p.	1000 Winter Street, Suite 3350 Waltham MA 02451	No	No	Yes	No
1575691	Polaris Venture Partners Founders' Fund Vi, L.p.	1000 Winter Street, Suite 3350 Waltham MA 02451	No	No	Yes	No
1665594	Polaris Venture Management Co. Vi, L.l.c.	One Marina Park Drive, 10Th Floor Boston MA 02210	No	No	Yes	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Disposition	2016-09-08	500,000	$16.80	4,156,173	No	4	S	Indirect	See Footnote

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Indirect	See Footnote

Footnotes

3,926,710 of these shares are owned directly by Polaris Venture Partners VI, L.P. and 229,463 of the shares are owned by Polaris Venture Partners Founders' Fund VI, L.P. (together with Polaris Venture Partners VI, L.P., the "Polaris Funds"). Polaris Venture Management Co. VI, L.L.C. ("Polaris Management") is the general partner of each of the Polaris Funds. Kevin Bitterman, a member of the Board of Directors of the Issuer, has an assignee interest in Polaris Management. Each of Polaris Management and Mr. Bitterman disclaim beneficial ownership of all the shares owned by the Polaris Funds and this report shall not be deemed an admission that either is the beneficial owner of such shares for purposes of Section 16 or for any other purpose, except to the extent of their pecuniary interests therein.