Blueprint Medicines Corp (BPMC) Stock: Deerfield Management Reports New 4.51% Stake

Page 2 of 12 – SEC Filing

CUSIP No.

09627Y109

13G

Page 2 of 10 Pages

 

1.	NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) Deerfield Mgmt, L.P.
2.	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*		(a) o   (b) ý
3.	SEC USE ONLY
4.	CITIZENSHIP OR PLACE OF ORGANIZATION Delaware
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	5.	SOLE VOTING POWER   0
	6.	SHARED VOTING POWER   1,231,343 (1)
	7.	SOLE DISPOSITIVE POWER   0
	8.	SHARED DISPOSITIVE POWER   1,231,343 (1)
9.	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON   1,231,343 (1)
10.	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*		o
11.	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 4.51%
12.	TYPE OF REPORTING PERSON*   PN

(1) Comprised of shares of common stock held by Deerfield Partners, L.P. and Deerfield International Master Fund, L.P., of which Deerfield Mgmt, L.P. is the general partner.