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 *
MILBURY PAUL J
   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. & CFO
(Last)
(First)
(Middle)
30 INTERNATIONAL PLACE		 3. Date of Earliest Transaction (Month/Day/Year)
12/18/2009
(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 06/10/2009   G   5,000 D $ 0 111,578 D  
Common Stock 12/14/2009   G   8,819 D $ 0 102,759 D  
Common Stock 12/18/2009   D   102,759 D (1) 0 D  

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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
NQSO $ 5.87 12/18/2009   D     135,417   (2) 02/08/2017 Common Stock 135,417 (2) 0 D  
NQSO $ 12.97 12/18/2009   D     46,875   (3) 03/19/2018 Common Stock 46,875 (3) 0 D  
NQSO $ 16.11 12/18/2009   D     66,713   (4) 04/17/2019 Common Stock 66,713 (4) 0 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
MILBURY PAUL J
30 INTERNATIONAL PLACE
TEWKSBURY, MA 01876		       V.P. & CFO  

Signatures

 /s/ Paul J. Milbury   12/22/2009
**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) 82,222 shares of common stock were disposed of pursuant to the merger agreement between issuer and Cisco Systems, Inc. ("Cisco") in exchange for a cash payment of $3,052,770 ($35.00 per share) on the effective date of the merger. A restricted stock unit award for 20,537 shares of common stock was disposed of pursuant to the merger agreement between issuer and Cisco in exchange for a restricted stock unit award for 30,104 shares of Cisco's common stock, which had a closing sales price as quoted on the NASDAQ Global Select Market of $23.33 per share on effective date of the merger.
(2) This option, which provided for vesting as to 27,014 of the underlying shares on August 8, 2009 and as to the remaining underlying shares in six equal quarterly installments beginning on November 8, 2009, was assumed by Cisco in the merger and replaced with an option to purchase 198,500 shares of Cisco common stock for $4.01 per share.
(3) This option, which provided for vesting as to 25% of the underlying shares on March 19, 2009 and an as to additional 6.25% each quarter thereafter, was assumed by Cisco in the merger and replaced with an option to purchase 68,711 shares of Cisco common stock for $8.85 per share.
(4) This option, which provided for vesting as to 25% of the underlying shares on April 17, 2010 and an as to additional 6.25% each quarter thereafter, was assumed by Cisco in the merger and replaced with an option to purchase 97,790 shares of Cisco common stock for $10.99 per share.

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