13G Filing: Viking Global and Deciphera Pharmaceuticals LLC (DCPH)

Schedule 13G PAGE 11 of 16

CUSIP No. 24344T101

ITEM 1(a). NAME OF ISSUER:
Deciphera Pharmaceuticals, Inc.

ITEM 1(b). ADDRESS OF ISSUER’S PRINCIPAL EXECUTIVE OFFICES:
500 Totten Pond Road
Waltham, Massachusetts 02451

ITEM 2(a). NAME OF PERSON FILING:
Viking Global Investors LP (“VGI”),
Viking Global Opportunities GP LLC (“Opportunities GP”),
Viking Global Opportunities Portfolio GP LLC
(“Opportunities Portfolio GP”),
Viking Global Opportunities Liquid Portfolio Sub-Master LP
(“Opportunities Fund”),
Viking Global Opportunities Intermediate LP
(“Opportunities Intermediate”),
DRAGSA 14 LLC (“DRAGSA”),
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 is a Delaware limited partnership; Opportunities GP,
Opportunities Portfolio GP and DRAGSA are Delaware limited
liability companies; Opportunities Fund and Opportunities
Intermediate are Cayman Islands exempted limited partnerships.
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 (“Common Stock”)

ITEM 2(e). CUSIP NUMBER: 24344T101

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)