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 *
  PRISM VENTURE PARTNERS III A LP
2. Date of Event Requiring Statement (Month/Day/Year)
05/14/2007
3. Issuer Name and Ticker or Trading Symbol
INSULET CORP [PODD]
(Last)
(First)
(Middle)
100 LOWDER BROOK DRIVE, SUITE 2500
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)

WESTWOOD, MA 02090
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 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 2,284
D
 

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
Series A Convertible Preferred Stock 10/19/2000   (1) Common Stock 15,095 (1) $ (1) D  
Series A Convertible Preferred Stock 02/16/2001   (1) Common Stock 15,095 (1) $ (1) D  
Series B Convertible Preferred Stock 06/29/2001   (1) Common Stock 57,116 (1) $ (1) D  
Series C Convertible Preferred Stock 09/10/2002   (1) Common Stock 86,286 (1) $ (1) D  
Series D Convertible Preferred Stock 02/23/2004   (1) Common Stock 61,101 (1) $ (1) D  
Series E Convertible Preferred Stock 02/02/2006   (1) Common Stock 48,132 (1) $ (1) D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
PRISM VENTURE PARTNERS III A LP
100 LOWDER BROOK DRIVE
SUITE 2500
WESTWOOD, MA 02090
    X    

Signatures

/s/ John L. Brooks III, Managing Member of Prism Venture Partners III, LLC, the general partner of Prism Investment Partners III, L.P., the genral partner of Prism Venture Partners III-A, L.P. 05/14/2007
**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) All shares of the issuer's preferred stock is convertible into its common stock on a 1-for-.3807 basis and has no expiration date. The number of underlying shares of common stock reported in Column 3 does not reflect a 1 to .3807 split, to be effective upon the closing of the issuer's initial public offering, pursuant to which each share preferred stock will automatically convert into common stock at a ratio of 1 share of preferred stock to .3807 of a share of common stock.

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