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
OMB APPROVAL
OMB Number: 3235-0287
Expires: January 31, 2005
Estimated average burden hours per response... 0.5

(Print or Type Responses)
1. Name and Address of Reporting Person *
Testa Justin
   2. Issuer Name and Ticker or Trading Symbol
COGNEX CORP [CGNX] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
EVP, MVSD
(Last)
(First)
(Middle)
COGNEX CORPORATION, ONE VISION DRIVE		 3. Date of Earliest Transaction (Month/Day/Year)
12/14/1993
(Street)

NATICK, MA 01760		 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 06/07/1999   M   12,000 A $ 7.5 12,000 D  
Common Stock 06/07/1999   S   12,000 D $ 29.75 0 D  
Common Stock 06/02/2000   M   2,500 A $ 7.5 2,500 D  
Common Stock 06/02/2000   S   2,500 D $ 59.75 0 D  
Common Stock 07/29/2003   M   20,000 A $ 7.5 20,000 D  
Common Stock 07/29/2003   S   20,000 D $ 28.0019 0 D  
Common Stock 03/01/2004   M   4,500 A $ 21.74 4,500 D  
Common Stock 03/01/2004   S   4,500 D $ 33.5 0 D  
Common Stock 03/01/2004   M   13,000 A $ 30.813 13,000 D  
Common Stock 03/01/2004   S   13,000 D $ 33.5 0 D  
Common Stock 07/22/2005   M   8,500 A $ 21.74 8,500 D  
Common Stock 07/22/2005   S   8,500 D $ 32.2208 0 D  
Common Stock 07/22/2005   M   7,500 A $ 28.67 7,500 D  
Common Stock 07/22/2005   S   7,500 D $ 32.2208 0 D  
Common Stock 05/07/2008   M   8,500 A $ 7.5 8,500 D  
Common Stock 05/07/2008   S   8,500 D $ 25.7537 0 D  

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number. SEC 1474 (9-02)

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) $ 7.5 12/14/1993   A   60,000   04/05/1999 12/14/2008 Common Stock 60,000 $ 0 60,000 D  
Non-Qualified Stock Option (right to buy) $ 7.5 06/07/1999   M     12,000 04/05/1999 12/14/2008 Common Stock 12,000 $ 0 48,000 D  
Non-Qualified Stock Option (right to buy) $ 7.5 06/02/2000   M     2,500 04/05/1999 12/14/2008 Common Stock 2,500 $ 0 45,500 D  
Non-Qualified Stock Option (right to buy) $ 7.5 07/29/2003   M     20,000 04/05/1999 12/14/2008 Common Stock 20,000 $ 0 25,500 D  
Non-Qualified Stock Option (right to buy) $ 7.5 05/07/2008   M     8,500 04/05/1999 12/14/2008 Common Stock 8,500 $ 0 17,000 D  
Non-Qualified Stock Option (right to buy) $ 18.125 12/21/2000   A   22,500   04/27/2002 12/21/2010 Common Stock 22,500 $ 0 22,500 D  
Non-Qualified Stock Option (right to buy) $ 18.7 02/19/2008   A   25,000   02/19/2009 02/19/2018 Common Stock 25,000 $ 0 25,000 D  
Non-Qualified Stock Option (right to buy) $ 18.7 02/19/2008   A   22,500   02/19/2010 02/19/2018 Common Stock 22,500 $ 0 47,500 D  
Non-Qualified Stock Option (right to buy) $ 21.195 04/02/2003   A   30,000   01/01/2004 02/04/2013 Common Stock 30,000 $ 0 30,000 D  
Non-Qualified Stock Option (right to buy) $ 21.66 01/29/2007   A   25,000   01/29/2008 01/29/2017 Common Stock 25,000 $ 0 25,000 D  
Non-Qualified Stock Option (right to buy) $ 21.74 02/11/2002   A   22,500   01/01/2003 02/11/2012 Common Stock 22,500 $ 0 22,500 D  
Non-Qualified Stock Option (right to buy) $ 21.74 03/01/2004   M     4,500 01/01/2003 02/11/2012 Common Stock 4,500 $ 0 18,000 D  
Non-Qualified Stock Option (right to buy) $ 21.74 07/22/2005   M     8,500 01/01/2003 02/11/2012 Common Stock 8,500 $ 0 9,500 D  
Non-Qualified Stock Option (right to buy) $ 25.02 01/10/2005   A   30,000   01/01/2006 01/10/2015 Common Stock 30,000 $ 0 30,000 D  
Non-Qualified Stock Option (right to buy) $ 28.67 01/05/2004   A   30,000   01/01/2005 01/05/2014 Common Stock 30,000 $ 0 30,000 D  
Non-Qualified Stock Option (right to buy) $ 28.67 07/22/2005   M     7,500 01/01/2005 01/05/2014 Common Stock 7,500 $ 0 22,500 D  
Non-Qualified Stock Option (right to buy) $ 29.38 01/30/2006   A   27,500   01/01/2007 01/30/2016 Common Stock 27,500 $ 0 27,500 D  
Non-Qualified Stock Option (right to buy) $ 30.813 12/14/1999   A   54,000   04/27/2002 12/14/2009 Common Stock 54,000 $ 0 54,000 D  
Non-Qualified Stock Option (right to buy) $ 30.813 03/01/2004   M     13,000 04/27/2002 12/14/2009 Common Stock 13,000 $ 0 41,000 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   05/08/2008
**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).

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

Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB number.