Editas Medicine, Inc. — Director's Dealing 2016

Feb 2, 2016

SEC Form 3 — Initial Statement of Beneficial Ownership

Issuer: Editas Medicine, Inc. (EDIT)
CIK: 0001650664
Period of Report: 2016-02-02

Reporting Person: Bosley Katrine (Director, President and CEO, 10% Owner)

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	1362966	Direct

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Series A-2 Preferred Stock	$		Common Stock (73856)		Direct
Series B Preferred Stock	$		Common Stock (4273)		Direct

Footnotes

F1: These shares are restricted stock owned by Katrine Bosley and issued pursuant to a restricted stock agreement between the Issuer and Ms. Bosley. Twenty-five percent of the shares vested on June 16, 2015, and the remainder are scheduled to vest in equal monthly installments thereafter until June 16, 2018.

F2: The Series A-2 Preferred Stock is convertible into Common Stock on a 2.6-for-one basis into the number of shares shown in column 3 at any time at the holder's election and automatically upon the closing of the Issuer's initial public offering without payment of further consideration. The shares have no expiration date.

F3: The Series B Preferred Stock is convertible into Common Stock on a 2.6-for-one basis into the number of shares shown in column 3 at any time at the holder's election and automatically upon the closing of the Issuer's initial public offering without payment of further consideration. The shares have no expiration date.