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
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(Print or Type Responses)
1. Name and Address of Reporting Person *
SUN ANTHONY
   2. Issuer Name and Ticker or Trading Symbol
COGNEX CORP [CGNX] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last)
(First)
(Middle)
ONE VISION DRIVE		 3. Date of Earliest Transaction (Month/Day/Year)
09/12/2018
(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 09/12/2018 09/12/2018 S   10,000 D $ 54.8999 274,262 D  

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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) $ 4             12/14/2000 03/02/2008 Common Stock 160,000   160,000 D  
Non-Qualified Stock Option (right to buy) $ 4.44             06/11/2011 06/11/2020 Common Stock 30,000   30,000 D  
Non-Qualified Stock Option (right to buy) $ 6.255             01/01/2006 01/10/2015 Common Stock 30,000   30,000 D  
Non-Qualified Stock Option (right to buy) $ 6.3988             12/31/2004 01/22/2016 Common Stock 40,000   40,000 D  
Non-Qualified Stock Option (right to buy) $ 7.6675             02/14/2012 02/14/2021 Common Stock 30,000   30,000 D  
Non-Qualified Stock Option (right to buy) $ 7.985             01/01/2005 02/25/2014 Common Stock 30,000   30,000 D  
Non-Qualified Stock Option (right to buy) $ 10.5275             02/13/2014 02/13/2023 Common Stock 30,000   30,000 D  
Non-Qualified Stock Option (right to buy) $ 16.72             02/12/2017 02/12/2026 Common Stock 26,000   26,000 D  
Non-Qualified Stock Option (right to buy) $ 19.655             02/18/2015 02/18/2024 Common Stock 26,000   26,000 D  
Non-Qualified Stock Option (right to buy) $ 20.625             02/17/2016 02/17/2025 Common Stock 26,000   26,000 D  
Non-Qualified Stock Option (right to buy) $ 38.39             02/21/2018 02/21/2027 Common Stock 26,000   26,000 D  
Non-Qualified Stock Option (right to buy) $ 56.44             02/20/2019 02/20/2028 Common Stock 13,000   13,000 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
SUN ANTHONY
ONE VISION DRIVE
NATICK, MA 01760		   X      

Signatures

 Anthony Sun   09/13/2018
**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).

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