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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1. Name and Address of Reporting Person * Ceyrolle Eric   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) Executive VP of Worldwide (Last) (First) (Middle) 32, ROUTE DE ST NOM, 78620 L'ETANG LA VILLE 3. Date of Earliest Transaction (Month/Day/Year) 10/27/2006 (Street) L'ETANG LA VILLE, I0 78620 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 10/27/2006   M   10,000 A $ 18.125 10,000 D   Common Stock 10/27/2006   S   10,000 D $ 23.3341 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

Non-Qualified Stock Option (right to buy)

$ 18.125

10/27/2006

M

10,000

10/27/2006(1)

12/21/2015

Common Stock

10,000

$ 23.3341

5,000

D

Non-Qualified Stock Option (right to buy)

$ 21.195

(2)

02/04/2018

Common Stock

22,500

22,500

D

Non-Qualified Stock Option (right to buy)

$ 21.74

(3)

02/11/2012

Common Stock

20,000

20,000

D

Non-Qualified Stock Option (right to buy)

$ 22.685

(4)

03/13/2011

Common Stock

1,071

1,071

D

Non-Qualified Stock Option (right to buy)

$ 24.595

(5)

08/21/2016

Common Stock

86,000

86,000

D

Non-Qualified Stock Option (right to buy)

$ 25.02

(6)

01/10/2020

Common Stock

22,500

22,500

D

Non-Qualified Stock Option (right to buy)

$ 28.67

(7)

01/05/2019

Common Stock

32,500

32,500

D

Non-Qualified Stock Option (right to buy)

$ 28.954

(8)

04/27/2014

Common Stock

19,000

19,000

D

Non-Qualified Stock Option (right to buy)

$ 29.38

(9)

01/30/2021

Common Stock

22,500

22,500

D

Non-Qualified Stock Option (right to buy)

$ 30.813

(10)

12/14/2014

Common Stock

17,000

17,000

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		10/30/2006
**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)	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 vests in six equal installments commencing on August 21, 2007.
(6)	This option becomes exercisable in one installment on January 1, 2009.
(7)	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.
(8)	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.
(9)	This option becomes exercisable in one installment on January 1, 2010.
(10)	This option became exercisable in one installment on April 27, 2006.

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