13D Filing: Baker Bros. Advisors and Acadia Pharmaceuticals Inc (NASDAQ:ACAD)

NAMES OF REPORTING PERSONS

Baker Bros. Advisors LP

CHECK
THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

(a) ¨

(b) ¨

SEC USE ONLY

SOURCE OF FUNDS*

OO

CHECK
BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEM 2(d) or 2(e) o

CITIZENSHIP OR PLACE OF ORGANIZATION

Delaware

7.

SOLE VOTING POWER:

28,570,614 (1)

8.

SHARED VOTING POWER:

0

9.

SOLE DISPOSITIVE POWER:

28,570,614 (1)

10.

SHARED DISPOSITIVE POWER:

0

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:

28,570,614 (1)

CHECK
BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*

¨

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

22.8% (1)(2)

TYPE OF REPORTING PERSON*

IA, PN

Includes 46,250 shares of the common stock of ACADIA Pharmaceuticals Inc. (the “Issuer”) underlying
options directly held by Julian C. Baker, a Managing Member of Baker Bros. Advisors (GP) LLC (“the Adviser GP”) and
85,250 shares of the common stock of the Issuer underlying options directly held by Dr. Stephen R. Biggar, a full-time employee
of Baker Bros. Advisors LP (the “Adviser”).