1 EXHIBIT 21 COGNEX CORPORATION SUBSIDIARIES OF THE REGISTRANT The registrant has the following subsidiaries, the financial statements of which are all included in the consolidated financial statements of the registrant: NAME OF STATE/COUNTRY OF PERCENT SUBSIDIARY INCORPORATION OWNERSHIP ---------- ---------------- --------- Cognex Technology and Investment Corporation California 100% Cognex Foreign Sales Corporation U.S. Virgin Islands 100 Cognex K.K. Japan 100 Cognex International, Inc. Delaware 100 Cognex Germany, Inc. Massachusetts 100 Cognex Singapore, Inc. Delaware 100 Cognex Korea, Inc. Delaware 100 Vision Drive, Inc. Delaware 100 VDI Mortgage Corporation Delaware 100 Vision Max, Inc. Delaware 100 Cognex/Acumen, Inc. Delaware 100