UNITED STATES
                             Washington, D.C. 20549

                                    FORM 8-K

                                 Current Report
                     Pursuant to Section 13 or 15(d) of the
                         Securities Exchange Act of 1934

        Date of Report (Date of Earliest Event Reported): April 23, 2009

                               COGNEX CORPORATION
               (Exact name of registrant as specified in charter)

      Massachusetts                  0-17869                    04-2713778
  ----------------------      ----------------------      ----------------------
    (State or other          (Commission File Number)        (I.R.S. Employer
    jurisdiction of                                         Identification No.)

                                One Vision Drive
                        Natick, Massachusetts 01760-2059
          (Address, including zip code, of principal executive offices)

                                 (508) 650-3000
              (Registrant's telephone number, including area code)

          (Former name or former address, if changed since last report)

        Check the appropriate box below if the Form 8-K filing is intended to
        simultaneously satisfy the filing obligation of the registrant under any
        of the following provisions:

|_|  Written  communications  pursuant to Rule 425 under the  Securities Act (17
     CFR 230.425)
|_|  Soliciting  material pursuant to Rule 14a-12 under the Exchange Act (17 CFR
|_|  Pre-commencement   communications  pursuant  to  Rule  14d-2(b)  under  the
     Exchange Act (17 CFR 240.14d-2(b))
|_|  Pre-commencement   communications  pursuant  to  Rule  13e-4(c)  under  the
     Exchange Act (17 CFR 240.13e-4(c))


Item 5.02  Departure of Directors or Certain  Officers;  Election of  Directors;
Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

Effective  April 23, 2009,  each of Eric  Ceyrolle,  Executive Vice President of
Worldwide Sales and Marketing,  MVSD, and Justin Testa, Executive Vice President
and Business  Unit  Manager,  Vision  Systems,  ceased to serve as an "executive
officer" of Cognex  Corporation  (the "Company") as such term is defined in Rule
3b-7 of the  Securities  Exchange  Act of 1934.  Mr.  Ceyrolle  has informed the
Company of his  intention  to resign from the Company  after 17 years of service
and return to his native France.  He relocated to the Company's  headquarters in
the United States in 2006 upon his promotion to Executive  Vice  President.  Mr.
Testa,  whose duties with the Company have changed,  will continue to serve as a
member of the Company's senior management team.


Pursuant to the requirements of the Securities Exchange Act of 1934, as amended,
the  registrant  has duly  caused  this report to be signed on its behalf by the
undersigned hereunto duly authorized.

                                           COGNEX CORPORATION

Dated: April 27, 2009                      By: /s/ Richard A. Morin
                                           Richard A. Morin
                                           Executive Vice President of Finance,
                                           Chief Financial Officer and Treasurer