Ownership Submission
FORM 3
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF 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 *
  NBVM GP, LLC
2. Date of Event Requiring Statement (Month/Day/Year)
06/05/2007
3. Issuer Name and Ticker or Trading Symbol
Starent Networks, Corp. [STAR]
(Last)
(First)
(Middle)
C/O NORTH BRIDGE VENTURE PARTNERS, 950 WINTER STREET, SUITE 4600
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director __X__ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

WALTHAM, MA 02451
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 Beneficially Owned
1.Title of Security
(Instr. 4)
2. Amount of Securities Beneficially Owned
(Instr. 4)
3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)
4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Common Stock 7,144,648 (1)
I
See Footnote (2)
Common Stock 3,398,072 (1)
I
See Footnote (3)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)
2. Date Exercisable and Expiration Date
(Month/Day/Year)
3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)
4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)
6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
NBVM GP, LLC
C/O NORTH BRIDGE VENTURE PARTNERS
950 WINTER STREET, SUITE 4600
WALTHAM, MA 02451
    X    
North Bridge Venture Management IV, L.P.
C/O NORTH BRIDGE VENTURE PARTNERS
950 WINTER STREET, SUITE 4600
WALTHAM, MA 02451
    X    
NORTH BRIDGE VENTURE PARTNERS IV A LP
C/O NORTH BRIDGE VENTURE PARTNERS
950 WINTER STREET, SUITE 4600
WALTHAM, MA 02451
    X    
NORTH BRIDGE VENTURE PARTNERS IV B LP
C/O NORTH BRIDGE VENTURE PARTNERS
950 WINTER STREET, SUITE 4600
WALTHAM, MA 02451
    X    
DAMORE RICHARD A
C/O NORTH BRIDGE VENTURE PARTNERS
950 WINTER STREET, SUITE 4600
WALTHAM, MA 02451
    X    

Signatures

/s/ Edward T. Anderson, Manager 06/05/2007
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(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 shares of common stock issued upon the automatic conversion of shares of Series A Convertible Preferred Stock, Series B Convertible Preferred Stock, Series C Convertible Preferred Stock, Series D Convertible Preferred Stock and Series E Convertible Preferred Stock of Starent Networks, Corp. upon the effectiveness of the Registration Statement on Form S-1 relating to Starent Network, Corp.'s initial public offering.
(2) Represents securities held of record by North Bridge Venture Partners IV-A, L.P., or NBVP IV-A. NBVM GP, LLC, or NVBM, the sole general partner of North Bridge Venture Management IV, L.P. which is the sole general partner of NBVP IV-A, has sole voting and dispositive power over these shares. The managers of NVBM having voting and dispositive power over these shares are Edward T. Anderson and Richard A. D'Amore, each of whom disclaims beneficial ownership of such shares except to the extent of their pecuniary interest.
(3) Represents securities held of record by North Bridge Venture Partners IV-B, L.P., or NBVP IV-B. NBVM GP, LLC, or NVBM, the sole general partner of North Bridge Venture Management IV, L.P. which is the sole general partner of NBVP IV-B, has sole voting and dispositive power over these shares. The managers of NVBM having voting and dispositive power over these shares are Edward T. Anderson and Richard A. D'Amore, each of whom disclaims beneficial ownership of such shares except to the extent of their pecuniary interest.

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