FORM 4
[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

Albers Jeffrey W. 		2. Issuer Name and Ticker or Trading Symbol

Blueprint Medicines Corp [ BPMC ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

__ X __ Director                      _____ 10% Owner
__ X __ Officer (give title below)      _____ Other (specify below)
CEO and President
(Last)          (First)          (Middle)

C/O BLUEPRINT MEDICINES CORPORATION, 38 SIDNEY STREET, SUITE 200 		3. Date of Earliest Transaction (MM/DD/YYYY)

11/6/2017
(Street)

CAMBRIDGE, MA 02139
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

_ X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8) 		4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4) 		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock   11/6/2017     M    24514   A $1.87   30000   D    
Common Stock   11/6/2017     S (1)    400   D $73.89   (2) 29600   D    
Common Stock   11/6/2017     S (1)    1999   D $72.91   (3) 27601   D    
Common Stock   11/6/2017     S (1)    2600   D $71.67   (4) 25001   D    
Common Stock   11/6/2017     S (1)    7432   D $70.40   (5) 17569   D    
Common Stock   11/6/2017     S (1)    16469   D $69.74   (6) 1100   D    
Common Stock   11/6/2017     S (1)    1100   D $68.95   (7) 0   D    

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3) 		2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. Code
(Instr. 8) 		5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		6. Date Exercisable and Expiration Date 7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4) 		8. Price of Derivative Security
(Instr. 5) 		9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Stock Option (Right to Buy)   $1.87   11/6/2017     M         24514      (8) 7/30/2024   Common Stock   24514   $0   825034   D    

Explanation of Responses:
(1)  The sales reported on this Form 4 were effected pursuant to a trading plan adopted on December 17, 2016 pursuant to Rule 10b5-1 under the Securities Exchange Act of 1934, as amended.
(2)  The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $73.46 to $74.42 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (2) through (7) to this Form 4.
(3)  The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $72.65 to $73.35 per share.
(4)  The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $71.23 to $72.13 per share.
(5)  The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $70.13 to $71.12 per share.
(6)  The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $69.13 to $70.12 per share.
(7)  The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $68.65 to $69.10 per share.
(8)  This option was granted on July 30, 2014. This option vested as follows: (i) 12,620 shares vested in two installments at a rate of 6,310 shares on December 21, 2015 and May 21, 2016; (ii) 35,871 shares vested in three installments at a rate of 11,957 on June 21, 2016, July 21, 2016 and August 21, 2016; and (iii) 4,983 shares vested on September 21, 2016.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Albers Jeffrey W.
C/O BLUEPRINT MEDICINES CORPORATION
38 SIDNEY STREET, SUITE 200
CAMBRIDGE, MA 02139 		X
CEO and President

Signatures
/s/ Christopher Frankenfield, Attorney-in-Fact 11/8/2017
** Signature of Reporting Person Date


Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.
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