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 *
  Testa Justin
 2. Date of Event Requiring Statement (Month/Day/Year)
04/30/2008		 3. Issuer Name and Ticker or Trading Symbol
COGNEX CORP [CGNX]
(Last)
(First)
(Middle)
COGNEX CORPORATION, ONE VISION DRIVE		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
EVP, MVSD
 5. If Amendment, Date Original Filed(Month/Day/Year)
04/30/2008
(Street)

NATICK, MA 01760		 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 223
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
Non-Qualified Stock Option (right to buy) 04/05/1999 12/14/2008 Common Stock 60,000 $ 7.5 D  
Non-Qualified Stock Option (right to buy) 04/27/2002 12/21/2010 Common Stock 22,500 $ 18.125 D  
Non-Qualified Stock Option (right to buy) 02/19/2009 02/19/2018 Common Stock 47,500 $ 18.7 D  
Non-Qualified Stock Option (right to buy) 01/01/2004 02/04/2013 Common Stock 30,000 $ 21.195 D  
Non-Qualified Stock Option (right to buy) 01/29/2008 01/29/2017 Common Stock 25,000 $ 21.66 D  
Non-Qualified Stock Option (right to buy) 01/01/2003 02/11/2012 Common Stock 22,500 $ 21.74 D  
Non-Qualified Stock Option (right to buy) 01/01/2006 01/10/2015 Common Stock 30,000 $ 25.02 D  
Non-Qualified Stock Option (right to buy) 01/01/2005 01/05/2014 Common Stock 30,000 $ 28.67 D  
Non-Qualified Stock Option (right to buy) 01/01/2007 01/30/2016 Common Stock 27,500 $ 29.38 D  
Non-Qualified Stock Option (right to buy) 04/27/2002 12/14/2009 Common Stock 54,000 $ 30.813 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Testa Justin
COGNEX CORPORATION
ONE VISION DRIVE
NATICK, MA 01760		       EVP, MVSD  

Signatures

Justin Testa 04/30/2008
**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).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, See Instruction 6 for procedure.

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