4
1
NASD

  0001196846
  Director


  COGNEX CORPORATION
  0000851205
  04-2713778

04/04/03
4
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 4
STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

[ ] Check this box if no longer subject to Section 16.
    Form 4 or Form 5 obligations may continue.
1. Name and Address of Reporting Person(s)
   WASSERMAN, REUBEN
   Cognex Corporation
   One Vision Drive

   Natick, MA  01760
2. Issuer Name and Ticker or Trading Symbol
   COGNEX CORPORATION (CGNX)
3. I.R.S. Identification Number of Reporting Person, if an entity (Voluntary)

4. Statement for Month/Day/Year
   4/4/2003
5. If Amendment, Date of Original (Month/Day/Year)
6. Relationship of Reporting Person(s) to Issuer (Check all applicable)
   [X] Director                   [ ] 10% Owner
   [ ] Officer (give title below) [ ] Other (specify below)

7. Individual or Joint/Group Filing (Check Applicable Line)
   [X] Form filed by One Reporting Person
   [ ] Form filed by More than One Reporting Person



Table I   Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
- ------------------------------------------------------------------------------------------------------------------------------------
1)Title of Security                           2)Trans-    3.Trans- 4.Securities Acquired(A)      5)Amount of    6)  7)Nature of
                                              action      action   or Disposed of (D)            Securities         Indirect
                                              Date        Code                   A               Beneficially   D   Beneficial
                                              (Month/                            or              Owned at       or  Ownership
                                              Day/Year)   Code V   Amount        D  Price        End of Month   I
- ------------------------------------------------------------------------------------------------------------------------------------
                                                                                           


Table II (PART 1)  Derivative Securities Acquired, Disposed of, or Beneficially Owned  (Columns 1 through 6)
- ------------------------------------------------------------------------------------------------------------------------------------
1)Title of Derivative          2)Conversion    3)Trans-       4)Trans-  5)Number of Derivative            6)Date Exercisable and
Security                       or Exercise     action         action    Securities Acquired (A)           Expiration Date
                               Price of        Date           Code      or Disposed of (D)
                               Derivative
                               Security                       Code  V   A                D                Exercisable  Expiration
- ------------------------------------------------------------------------------------------------------------------------------------
                                                                                                  
Non-Qualified Stock Option     $16.0000                                                                                03/02/08
(right to buy)
Non-Qualified Stock Option     $21.1950        04/02/03       A         10,000                                         04/02/13
(right to buy)
Non-Qualified Stock Option     $25.5950                                                                                01/22/16
(right to buy)


Table II (PART 2)  Derivative Securities Acquired, Disposed of, or Beneficially Owned  (Columns 1,3 and 7 through 11)
- ------------------------------------------------------------------------------------------------------------------------------------
1)Title of Derivative          3)Trans-  7)Title and Amount                           8)Price     9)Number of   10) 11)Nature of
Security                       action    of Underlying                                of Deri-    Derivative        Indirect
                               Date      Securities                                   vative      Securities    D   Beneficial
                                                                        Amount or     Security    Beneficially  or  Ownership
                                                                        Number of                 Owned at      I
                  -                      Title                          Shares                    End of Month
- ------------------------------------------------------------------------------------------------------------------------------------
                                                                                               
Non-Qualified Stock Option               Common Stock                   30,000                    30,000        D   Direct
(right to buy)
Non-Qualified Stock Option     04/02/03  Common Stock                   10,000                    10,000        D   Direct
(right to buy)
Non-Qualified Stock Option               Common Stock                   10,000                    10,000        D   Direct
(right to buy)


Explanation of Responses:




SIGNATURE OF REPORTING PERSON
/S/ WASSERMAN, REUBEN
DATE 04/04/03