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 *
  Ceyrolle Eric
 2. Date of Event Requiring Statement (Month/Day/Year)
08/17/2006		 3. Issuer Name and Ticker or Trading Symbol
COGNEX CORP [CGNX]
(Last)
(First)
(Middle)
32, ROUTE DE ST NOM, 78620 L'ETANG LA VILLE		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Executive VP of Worldwide
 5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

L'ETANG LA VILLE, I0 78620		 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)

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)   (1) 12/21/2015 Common Stock 15,000 $ 18.125 D  
Non-Qualified Stock Option (right to buy)   (2) 02/04/2018 Common Stock 22,500 $ 21.195 D  
Non-Qualified Stock Option (right to buy)   (3) 02/11/2012 Common Stock 20,000 $ 21.74 D  
Non-Qualified Stock Option (right to buy)   (4) 03/13/2011 Common Stock 1,071 $ 22.685 D  
Non-Qualified Stock Option (right to buy)   (5) 01/10/2020 Common Stock 22,500 $ 25.02 D  
Non-Qualified Stock Option (right to buy)   (6) 01/05/2019 Common Stock 32,500 $ 28.67 D  
Non-Qualified Stock Option (right to buy)   (7) 04/27/2014 Common Stock 19,000 $ 28.954 D  
Non-Qualified Stock Option (right to buy)   (8) 01/30/2021 Common Stock 22,500 $ 29.38 D  
Non-Qualified Stock Option (right to buy)   (9) 12/14/2014 Common Stock 17,000 $ 30.813 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Ceyrolle Eric
32, ROUTE DE ST NOM
78620 L'ETANG LA VILLE
L'ETANG LA VILLE, I0 78620		       Executive VP of Worldwide  

Signatures

Eric Ceyrolle 08/22/2006
**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) The option is exercisable in five annual installments. The first installment became exercisable on April 27, 2003. One thousand shares of this first installment remain exercisable. The next three installments each for three thousand shares became exercisable on April 27, 2004, April 27, 2005 and April 27, 2006. The last installment (5000 shares) becomes exercisable on April 27, 2007.
(2) This option becomes exercisable in one installment on January 1, 2007
(3) This option is exercisable in four installments. The first installment for eight thousand shares became exercisable on January 1, 2003. The second, third and fourth installments each for four thousand shares became exercisable on January 1, 2004, January 1, 2005, and January 1, 2006.
(4) This option became exercisable in one installment on April 1, 2002.
(5) This option becomes exercisable in one installment on January 1, 2009.
(6) This option becomes exercisable in two separate installments. Twenty-two thousand five hundred shares become exercisable on January 1, 2008. Ten thousand shares become exercisable on January 5, 2008.
(7) This option is exercisable in three installments. The first installment for one thousand shares became exercisable on April 27, 2003. The second installment for one thousand shares became exercisable on April 27, 2004. The third installment for seventeen thousand shares became exercisable on April 27, 2005.
(8) This option becomes exercisable in one installment on January 1, 2010.
(9) This option became exercisable in one installment on April 27, 2006.

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