13G Filing: Viking Global and Editas Medicine, Inc. (EDIT)

Page 17 of 20

Page 17 of 20 SEC Filing

Schedule 13G PAGE 17 of 20

CUSIP No. 28106W103

B. VGP
(a) Amount beneficially owned: 753,625
(b) Percent of class: 2.1%
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote
0
(ii) shared power to vote or to direct the vote
753,625
(iii) sole power to dispose or to direct the disposition
of 0
(iv) shared power to dispose or to direct the disposition
of 753,625

VGP, as the general partner of VGE and VGEII, has the
authority to dispose of and vote the shares of Common Stock
directly owned by VGE and VGEII. VGP serves as investment
manager to VGEIII and has the authority to dispose of and vote
the shares of Common Stock directly owned by VGEIII. VGP does
not directly own any shares of Common Stock.

Based on Rule 13d-3 of the Act, VGP may be deemed to
beneficially own the shares of Common Stock directly held by
VGE, VGEII and VGEIII.

C. VLFGP
(a) Amount beneficially owned: 266,782
(b) Percent of class: 0.7%
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote
0
(ii) shared power to vote or to direct the vote
266,782
(iii) sole power to dispose or to direct the disposition
of 0
(iv) shared power to dispose or to direct the disposition
of 266,782

VLFGP serves as the investment manager of VLFM and has the
authority to dispose of and vote the shares of Common Stock
directly owned by VLFM. VLFGP does not directly own
any shares of Common Stock.

Based on Rule 13d-3 of the Act, VLFGP may be deemed to
beneficially own the shares of Common Stock directly held by
VLFM.

D. Opportunities GP
(a) Amount beneficially owned: 1,709,401
(b) Percent of class: 4.7%
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote
0
(ii) shared power to vote or to direct the vote
1,709,401
(iii) sole power to dispose or to direct the disposition
of 0
(iv) shared power to dispose or to direct the disposition
of 1,709,401

Opportunities GP serves as the sole member of Opportunities
Portfolio GP and has the authority to dispose of and vote the
shares of Common Stock controlled by Opportunities Portfolio GP,
which consists of the shares of Common Stock directly held by
Opportunities Fund. Opportunities GP does not directly own
any shares of Common Stock.

Based on Rule 13d-3 of the Act, Opportunities GP may be
deemed to beneficially own the shares of Common Stock
controlled by Opportunities Portfolio GP, which consists of
the shares of Common Stock directly held by Opportunities Fund.

E. Opportunities Portfolio GP
(a) Amount beneficially owned: 1,709,401
(b) Percent of class: 4.7%
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote
0
(ii) shared power to vote or to direct the vote
1,709,401
(iii) sole power to dispose or to direct the disposition
of 0
(iv) shared power to dispose or to direct the disposition
of 1,709,401

Opportunities Portfolio GP serves as the general partner of
Opportunities Fund and has the authority to dispose of and vote the shares
of Common Stock directly owned by Opportunities Fund. Opportunities
Portfolio GP does not directly own any shares of Common Stock.

Based on Rule 13d-3 of the Act, Opportunities Portfolio GP
may be deemed to beneficially own the shares of Common Stock
directly held by Opportunities Fund.

Follow Editas Medicine Inc.

Page 17 of 20