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 *

MPM BIOVENTURES V, L.P. 		2. Issuer Name and Ticker or Trading Symbol

Cerecor Inc. [ CERC ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

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

C/O MPM ASSET MANAGEMENT, 450 KENDALL STREET 		3. Date of Earliest Transaction (MM/DD/YYYY)

10/20/2015
(Street)

CAMBRIDGE, MA 02142
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

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

___ Form filed by One Reporting Person
_ X _ 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   10/20/2015     C    595436   A   (1) 595436   I   See Footnote   (2)

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
Series B Convertible Preferred Stock     (1) 10/20/2015     C         16672224      (1)   (1) Common Stock   595436   $0   0   I   See Footnote   (2)

Explanation of Responses:
( 1)  The shares of Series B Convertible Preferred Stock (the "Series B Shares") automatically converted into Common Stock on a 1-for-0.03571 basis and had no expiration date.
( 2)  The shares are held as follows: 573,170 by MPM BioVentures V, L.P. ("BV V") and 22,266 by MPM Asset Management Investors BV5 LLC ("AM BV5"). MPM BioVentures V GP LLC ("BV GP") is the general partner of BV V. MPM BioVentures V LLC ("BV LLC") is the managing member of BV GP and AM BV5. Ansbert Gadicke, Luke Evnin, Vaughn M. Kailian, James Paul Scopa and Todd Foley are the members of BV LLC. Each Reporting Person disclaims beneficial ownership of the securities except to the extent of his or its respective pecuniary interest therein.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
MPM BIOVENTURES V, L.P.
C/O MPM ASSET MANAGEMENT
450 KENDALL STREET
CAMBRIDGE, MA 02142
X

MPM ASSET MANAGEMENT INVESTORS BV5 LLC
C/O MPM ASSET MANAGEMENT
450 KENDALL STREET
CAMBRIDGE, MA 02142
X

MPM BIOVENTURES V GP LLC
C/O MPM ASSET MANAGEMENT
450 KENDALL STREET
CAMBRIDGE, MA 02142
X

MPM BIOVENTURES V LLC
C/O MPM ASSET MANAGEMENT
450 KENDALL STREET
CAMBRIDGE, MA 02142
X

GADICKE ANSBERT
C/O MPM ASSET MANAGEMENT
450 KENDALL STREET
CAMBRIDGE, MA 02142
X

EVNIN LUKE
C/O MPM ASSET MANAGEMENT
450 KENDALL STREET
CAMBRIDGE, MA 02142
X

KAILIAN VAUGHN M
C/O MPM ASSET MANAGEMENT
450 KENDALL STREET
CAMBRIDGE, MA 02142
X

Scopa James Paul
C/O MPM ASSET MANAGEMENT
450 KENDALL STREET
CAMBRIDGE, MA 02142
X

Foley Todd
C/O MPM ASSET MANAGEMENT
450 KENDALL STREET
CAMBRIDGE, MA 02142
X


Signatures
By Ansbert Gadicke, member of MPM BioVentures V LLC, the managing member of MPM BioVentures V GP LLC /s/ Ansbert Gadicke 10/20/2015
** Signature of Reporting Person Date

By Ansbert Gadicke, member of MPM BioVentures V LLC, the managing member of MPM BioVentures V GP LLC, the general partner of MPM BioVentures V, L.P. /s/ Ansbert Gadicke 10/20/2015
** Signature of Reporting Person Date

By Ansbert Gadicke, member of MPM BioVentures V LLC, the manager of MPM Asset Management Investors BV5 LLC /s/ Ansbert Gadicke 10/20/2015
** Signature of Reporting Person Date

/s/ Luke Evnin 10/20/2015
** Signature of Reporting Person Date

/s/ Todd Foley 10/20/2015
** Signature of Reporting Person Date

/s/ Ansbert Gadicke 10/20/2015
** Signature of Reporting Person Date

/s/ Vaughn M. Kailian 10/20/2015
** Signature of Reporting Person Date

/s/ James Paul Scopa 10/20/2015
** 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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