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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1. Name and Address of Reporting Person * Kathuria Vijay   2. Issuer Name and Ticker or Trading Symbol Starent Networks, Corp. [STAR] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) V.P. & G.M. India (Last) (First) (Middle) 30 INTERNATIONAL PLACE 3. Date of Earliest Transaction (Month/Day/Year) 09/08/2009 (Street) TEWKSBURY, MA 01876 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) _X_ Form filed by One Reporting Person ___ 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 09/08/2009   M(1)   35,000 A $ 0.3 50,634 D   Common Stock 09/08/2009   S(1)   35,000 D $ 23.15 (2) 15,634 D   Common Stock 09/09/2009   M(1)   6,666 A $ 0.3 22,300 D   Common Stock 09/09/2009   S(1)   6,666 D $ 25 (3) 15,634 D   Common Stock 09/09/2009   S(1)   11,666 D $ 25 0 I See Footnote (4)

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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

Non-Qualified Stock Option (right to buy)

$ 0.3

09/09/2009

M(1)

6,666

(5)

01/23/2013

Common Stock

6,666

$ 0

20,000

D

Non-Qualified Stock Option (right to buy)

$ 0.3

09/08/2009

M(1)

35,000

(5)

02/14/2014

Common Stock

35,000

$ 0

26,666

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Kathuria Vijay 30 INTERNATIONAL PLACE TEWKSBURY, MA 01876			V.P. & G.M. India

Signatures

By: /s/Jonathan M. Moulton, Attorney in Fact For: Vijay Kathuria		09/10/2009
**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)	Transaction made pursuant to 10(b)5-1 plan.
(2)	This transaction was executed in multiple trades at prices ranging from $22.78 to $23.35. The price reported above reflects the weighted average sales price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.
(3)	This transaction was executed in multiple trades at prices ranging from $25.00 to $25.01. The price reported above reflects the weighted average sales price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.
(4)	Represents 11,666 shares of common stock held by Mr. Kathuria's wife, Sangeeta Kathuria. Mr. Kathuria disclaims beneficial ownership of these shares except to the extent of his pecuniary interest, if any.
(5)	The option vests 25% on 9/1/01 and the remainder vests in 12 equal quarterly installments beginning on 12/1/01.

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