COGNEX CORP — Director's Dealing 2011

May 9, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: COGNEX CORP (CGNX)
CIK: 0000851205
Period of Report: 2011-05-06

Reporting Person: ALIAS PATRICK (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-05-06	Common Stock	M	14600	$18.125	Acquired	14600	Direct
2011-05-06	Common Stock	S	14600	$35.1715	Disposed	0	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-05-06	Non-Qualified Stock Option (right to buy)	$18.125	M	14600	Disposed	2015-12-21	Common Stock (14600)	Direct