Ownership Submission
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

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
New Mountain Investments II, LLC
  2. Issuer Name and Ticker or Trading Symbol
Bellerophon Therapeutics, Inc. [BLPH]
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 NEW MOUNTAIN CAPITAL, L.L.C., 787 SEVENTH AVENUE, 48TH FLOOR
3. Date of Earliest Transaction (Month/Day/Year)
02/19/2015
(Street)

NEW YORK, NY 10019
4. If Amendment, Date Original Filed(Month/Day/Year)
6. Individual or Joint/Group Filing(Check Applicable Line)
___ Form filed by One Reporting Person
_X_ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction 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 02/19/2015   P   1,070,166 A $ 12 4,859,885 D (1) (2)  

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction 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
(Month/Day/Year)
7. Title and Amount of Underlying Securities
(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

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
New Mountain Investments II, LLC
C/O NEW MOUNTAIN CAPITAL, L.L.C.
787 SEVENTH AVENUE, 48TH FLOOR
NEW YORK, NY 10019
    X    
Allegheny New Mountain Partners L P
C/O NEW MOUNTAIN CAPITAL, L.L.C.
787 SEVENTH AVENUE, 48TH FLOOR
NEW YORK, NY 10019
    X    
New Mountain Affiliated Investors II LP
C/O NEW MOUNTAIN CAPITAL, L.L.C.
787 SEVENTH AVENUE, 48TH FLOOR
NEW YORK, NY 10019
    X    
New Mountain Capital, L.L.C.
C/O NEW MOUNTAIN CAPITAL, L.L.C.
787 SEVENTH AVENUE, 48TH FLOOR
NEW YORK, NY 10019
    X    
New Mountain Partners II (AIV-A) L.P.
C/O NEW MOUNTAIN CAPITAL, L.L.C.
787 SEVENTH AVENUE, 48TH FLOOR
NEW YORK, NY 10019
    X    
New Mountain Partners II (AIV-B) L.P.
C/O NEW MOUNTAIN CAPITAL, L.L.C.
787 SEVENTH AVENUE, 48TH FLOOR
NEW YORK, NY 10019
    X    
New Mountain Partners II Special (AIV-A) LP
C/O NEW MOUNTAIN CAPITAL, L.L.C.
787 SEVENTH AVENUE, 48TH FLOOR
NEW YORK, NY 10019
    X    
KLINSKY STEVEN B
C/O NEW MOUNTAIN CAPITAL, L.L.C.
787 SEVENTH AVENUE, 48TH FLOOR
NEW YORK, NY 10019
    X    

Signatures

 /s/ Steven Klinsky, Managing Member of New Mountain Investments II, L.L.C.   02/23/2015
**Signature of Reporting Person Date

 /s/ Steven Klinsky, Managing Member of New Mountain Investments II, L.L.C. as GP of Allegheny New Mountain Partners, L.P.   02/23/2015
**Signature of Reporting Person Date

 /s/ Steven Klinsky, Managing Member of New Mountain Investments II, L.L.C. as GP of New Mountain Affiliated Investors II, L.P.   02/23/2015
**Signature of Reporting Person Date

 /s/ Steven Klinsky, CEO, New Mountain Capital, L.L.C.   02/23/2015
**Signature of Reporting Person Date

 /s/ Steven Klinsky, Managing Member of New Mountain Investments II, L.L.C. as GP of New Mountain Partners II (AIV-A) L.P.   02/23/2015
**Signature of Reporting Person Date

 /s/ Steven Klinsky, Managing Member of New Mountain Investments II, L.L.C. as GP of New Mountain Partners II (AIV-B) L.P.   02/23/2015
**Signature of Reporting Person Date

 /s/ Steven Klinsky, Managing Member of New Mountain Investments II, L.L.C. as GP of New Mountain Partners II Special (AIV-A) L.P.   02/23/2015
**Signature of Reporting Person Date

 /s/ Steven Klinsky   02/23/2015
**Signature of Reporting Person Date

Explanation of Responses:

* 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).
(1) Consists of 346,974 shares held by Allegheny New Mountain Partners, L.P., 80,165 shares held by New Mountain Affiliated Investors II, L.P., 3,842,663 shares held by New Mountain Partners II (AIV-A), L.P. and 590,083 shares held by New Mountain Partners II (AIV-B), L.P. (such holders collectively, the "New Mountain Entities"). The general partner of each of the New Mountain Entities is New Mountain Investments II, L.L.C. and the manager of each of the New Mountain Entities is New Mountain Capital L.L.C. Steven Klinsky is the managing member of New Mountain Investments II, L.L.C. Adam Weinstein is a member of New Mountain Investments II, L.L.C. Matthew Holt is a member of New Mountain Investments II, L.L.C. New Mountain Investments II, L.L.C. has decision-making power over the disposition and voting of shares of portfolio investments of each of the New Mountain Entities.
(2) New Mountain Capital, L.L.C. also has voting power over the shares of portfolio investments of the New Mountain Entities in its role as the investment advisor. New Mountain Capital, L.L.C. is a wholly-owned subsidiary of New Mountain Capital Group, L.L.C. New Mountain Capital Group, L.L.C. is 100% owned by Steven Klinsky. Since New Mountain Investments II, L.L.C. has decision-making power over the New Mountain Entities, Mr. Klinsky may be deemed to beneficially own the shares that the New Mountain Entities hold of record or may be deemed to beneficially own. Mr. Klinsky, Mr. Holt, Mr. Weinstein, New Mountain Investments II, L.L.C. and New Mountain Capital, L.L.C. disclaim beneficial ownership over the shares held by the New Mountain Entities, except to the extent of their pecuniary interest therein.

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