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

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Page 3 of 10 – SEC Filing

CUSIP No.   004225108   Page   3   of   10   Pages
1.

NAMES OF REPORTING PERSONS

Baker Bros. Advisors (GP) LLC

2.

CHECK
THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

(a) ¨

(b) ¨

3.

SEC USE ONLY

4.

SOURCE OF FUNDS*

OO

5.

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

6.

CITIZENSHIP OR PLACE OF ORGANIZATION

Delaware

NUMBER
OF SHARES
BENEFICIALLY
OWNED
BY EACH
REPORTING
PERSON WITH

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

11.

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:

28,570,614 (1)

12.

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

¨

13.

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

22.8% (1)(2)

14.

TYPE OF REPORTING PERSON*

HC, OO

(1) Includes 46,250 shares of the common stock of the Issuer underlying options directly held by Julian C.
Baker, a Managing Member of 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 the Adviser.
(2) Based on 125,006,723 shares of the Issuer’s common
stock outstanding as of July 31, 2018, as reported in the Issuer’s Form 10-Q filed with the SEC on August 8, 2018.

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