Biocryst Pharmaceuticals Inc (BCRX): Baker Bros. Advisors Unloads Nearly 4 Million Shares

Page 2 of 9 – SEC Filing

CUSIP No.  09058V103 Page   2   of  9   Pages

1.

NAMES OF REPORTING PERSONS

Baker Bros. Advisors LP

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)

¨

6.

CITIZENSHIP OR PLACE OF ORGANIZATION

Delaware

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH

7.

SOLE VOTING POWER 11,038,944 (1)

8.

SHARED VOTING POWER: 0

9.

SOLE DISPOSITIVE POWER: 11,038,944 (1)

10.

SHARED DISPOSITIVE POWER: 0

11.

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
11,038,944 (1)

12.

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

¨

13.

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

14.95% (1)

14.

TYPE OF REPORTING PERSON (See Instructions)

IA, PN

(1) Includes 75,000 shares of the Issuer’s common stock underlying options.

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