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

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Schedule 13G PAGE 18 of 20

CUSIP No. 28106W103

F. VGE
(a) Amount beneficially owned: 256,986
(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
256,986
(iii) sole power to dispose or to direct the disposition
of 0
(iv) shared power to dispose or to direct the disposition
of 256,986

VGE has the authority to dispose of and vote the shares
of Common Stock directly owned by it, which power may be
exercised by its general partner, VGP, and by VGI, an
affiliate of VGP, which provides managerial services to VGE.

G. VGEII
(a) Amount beneficially owned: 15,072
(b) Percent of class: 0.0%
(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
15,072
(iii) sole power to dispose or to direct the disposition
of 0
(iv) shared power to dispose or to direct the disposition
of 15,072

VGEII has the authority to dispose of and vote the shares
of Common Stock directly owned by it, which power may be
exercised by its general partner, VGP, and by VGI, an
affiliate of VGP, which provides managerial services to VGEII.

H. VGEIII
(a) Amount beneficially owned: 481,567
(b) Percent of class: 1.3%
(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
481,567
(iii) sole power to dispose or to direct the disposition
of 0
(iv) shared power to dispose or to direct the disposition
of 481,567

VGEIII has the authority to dispose of and vote the shares
of Common Stock directly owned by it, which power may be
exercised by its investment manager, VGP, and by VGI, an
affiliate of VGP, which provides managerial services to VGEIII.
Viking Global Equities III Ltd. (a Cayman Islands exempted
company) invests substantially all of its assets through VGEIII.

I. VLFM
(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

VLFM has the authority to dispose of and vote the
shares of Common Stock directly owned by it, which power may
be exercised by its investment manager, VLFGP, and by VGI,
an affiliate of VLFGP, which provides managerial services
to VLFM. Viking Long Fund LP (a Delaware limited partnership)
and Viking Long Fund III Ltd. (a Cayman Islands exempted
company), through its investment in Viking Long Fund Intermediate
LP (a Cayman Islands limited partnership), invest substantially
all of their assets through VLFM.

J. Opportunities Fund
(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 Fund has the authority to dispose of and vote the
shares of Common Stock directly owned by it, which power may
be exercised by its general partner, Opportunities Portfolio GP,
and by VGI, an affiliate of Opportunities Portfolio GP, which provides
managerial services to Opportunities Fund. Viking Global Opportunities LP
(a Delaware limited partnership) and Viking Global Opportunities III LP
(a Cayman Islands exempted limited partnership), through its investment
in Viking Global Opportunities Intermediate LP (a Cayman Islands
exempted limited partnership), invest substantially all of their
assets in Viking Global Opportunities Master LP (a Cayman Islands
exempted limited partnership), which in turn invests through
Opportunities Fund.

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