13G Filing: Viking Global and Calithera Biosciences Inc. (CALA)

Schedule 13G/A PAGE 12 of 18

CUSIP No. 13089P101

ITEM 1(a). NAME OF ISSUER:
Calithera Biosciences, Inc.

ITEM 1(b). ADDRESS OF ISSUER’S PRINCIPAL EXECUTIVE OFFICES:
343 Oyster Point Blvd., Suite 200
South San Francisco, California 94080

ITEM 2(a). NAME OF PERSON FILING:
Viking Global Investors LP (“VGI”),
Viking Global Performance LLC (“VGP”),
Viking Global Equities LP (“VGE”),
Viking Global Equities II LP (“VGEII”),
VGE III Portfolio Ltd. (“VGEIII”),
Viking Long Fund GP LLC (“VLFGP”),
Viking Long Fund Master Ltd. (“VLFM”),
O. Andreas Halvorsen, David C. Ott and
Rose S. Shabet (collectively, the “Reporting Persons”)

ITEM 2(b). ADDRESS OF PRINCIPAL OFFICE OR, IF NONE, RESIDENCE:
The business address of each of the Reporting Persons is
55 Railroad Avenue, Greenwich, Connecticut 06830.

ITEM 2(c). CITIZENSHIP:
VGI, VGE and VGEII are Delaware limited partnerships;
VGEIII and VLFM are Cayman Islands exempted companies; and
VGP and VLFGP are Delaware limited liability companies.
O. Andreas Halvorsen is a citizen of Norway.
David C. Ott and Rose S. Shabet are citizens of
the United States.

ITEM 2(d). TITLE OF CLASS OF SECURITIES:
Common stock, $0.0001 par value per share (“Common Stock”)

ITEM 2(e). CUSIP NUMBER: 13089P101

ITEM 3. IF THIS STATEMENT IS FILED PURSUANT TO 13d-1(b) OR 13d-2(b) OR (c),
CHECK WHETHER THE PERSON FILING IS A:

(a) [ ] Broker or dealer registered under Section 15 of the
Act

(b) [ ] Bank as defined in Section 3(a)(6) of the Act

(c) [ ] Insurance Company as defined in Section 3(a)(19) of
the Act

(d) [ ] Investment Company registered under Section 8 of the
Investment Company Act of 1940

(e) [ ] Investment Adviser registered under Section 203 of the
Investment Advisers Act of 1940: see Rule 13d-
1(b)(1)(ii)(E)

(f) [ ] Employee Benefit Plan, Pension Fund which is subject
to the provisions of the Employee Retirement Income
Security Act of 1974 or Endowment Fund; see Rule 13d-
1(b)(1)(ii)(F)