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Important Notice Regarding the Availability of Proxy Materials for the Cognex Corporation Special
Meeting in Lieu of the 2011 Annual Meeting of Shareholders to be Held on April 27, 2011

You are receiving this notice that the proxy materials for the Special Meeting in Lieu of the 2011 Annual Meeting of Shareholders are available on the Internet. Follow the instructions below to view the materials and vote online or request a copy. The items to be voted on and location of the meeting are on the reverse side. Your vote is important!

This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. We encourage you to access and review all of the important information contained in the proxy materials before voting. The proxy statement and annual report to shareholders are available at:

		Easy Online Access — A Convenient Way to View Proxy Materials and Vote
		When you go online to view materials, you can also vote your shares.
		Step 1: Go to www.envisionreports.com/CGNX to view the materials.
		Step 2: Click on Cast Your Vote or Request Materials.
		Step 3: Follow the instructions on the screen to log in.
		Step 4: Make your selection as instructed on each screen to select delivery preferences and vote.

When you go online, you can also help the environment by consenting to receive electronic delivery of future materials. You will be able to vote electronically until 1:00 a.m. EDT on April 27, 2011.

		Obtaining a Copy of the Proxy Materials – If you want to receive a paper or e-mail copy of these documents, you must request one. There is no charge to you for requesting a copy. Please make your request for a copy as instructed on the reverse side on or before April 13, 2011 to facilitate timely delivery.

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Special Meeting in Lieu of the 2011 Annual Meeting of Shareholders

Cognex Corporation’s Special Meeting in Lieu of the 2011 Annual Meeting of Shareholders will be held on Wednesday, April 27, 2011 at Cognex Corporation, One Vision Drive, Natick, Massachusetts, at 9:00 a.m., local time.

Proposals to be voted on at the meeting are listed below along with the Board of Directors’ recommendations.

The Board of Directors recommends that you vote FOR the nominees listed in Proposal 1, FOR Proposals 2 and 4, and FOR 3 Years in Proposal 3:

	1.		The election of three directors to serve for a term ending in 2014 and one director to serve for a term ending in 2013. Nominees: (01) Robert J. Shillman, (02) Jerald G. Fishman, (03) Theodor Krantz, and (04) Robert J. Willett
	2.		To vote on a non-binding proposal regarding the compensation of Cognex’s named executive officers as described in the proxy statement including the Compensation Discussion and Analysis, compensation tables and narrative discussion (“ say-on-pay”).
	3.		To vote on a non-binding proposal regarding the frequency of “say-on-pay” proposals.
	4.		To ratify the selection of Grant Thornton LLP as Cognex’s independent registered public accounting firm for fiscal year 2011.
	5.		The consideration of any other business which may properly come before the meeting or any adjournment or postponement thereof.

PLEASE NOTE – YOU CANNOT VOTE BY RETURNING THIS NOTICE. To vote your shares you must vote online or request a paper copy of the proxy materials to receive a proxy card. If you wish to attend and vote at the meeting, please bring this notice with you.

Directions to the Cognex Corporation Special Meeting in Lieu of the 2011 Annual Meeting of Shareholders

DIRECTIONS TO COGNEX CORPORATION				From Route 90 (Mass Turnpike), points west or east of Route 9:
One Vision Drive				•		Take Exit 12 (Route 9 East) toward Framingham
Natick, MA 01760				•		Follow “From Route 9 East”
Please note: Guest parking is availble in the front parking lot.				From Route 9 West:
				•		Follow Route 9 West
From Boston and Logan Airport:				•		Look for an Audi dealership on your right as you head up a hill. Immediately after the bowling alley that is at the crest of that hill, take a right onto Vision Drive. Cognex is on the left of Vision Drive.
•		Merge onto Route 90 West (Mass Turnpike) toward Worcester
•		From Route 90 West, take Exit 15 (I-95/Route 128) toward Waltham/Dedham
•		From I-95 S/Route 128 S, take Exit 20B (Route 9 West) toward Framingham/Worcester		From Route 9 East:
•		Follow “From Route 9 West”		•		Follow Route 9 East
				•		Take the exit ramp for Route 27 North / North Main Street
From Route 128 (I 95), points north or south of Route 9:				•		Take right onto Rutledge Road
•		Take Exit 20B (Route 9 West) toward Framingham/Worcester		•		Take right onto Wentworth Road
•		Follow “From Route 9 West”		•		Take right onto Terrane Avenue
				•		Take right onto Wethersfield Road
From Route 495, points north or south of Route 90:				•		Take right onto Route 9 West
•		Take Exit 22 Route 90 East (Mass Turnpike) toward Framingham/Boston		•		Vision Drive is 0.1 mile on the right. Immediately after the bowling aley, take a right onto Vision Drive. Cognex is on the left of Vision Drive.
•		From Route 90 East (Mass Turnpike), take Exit 12 (Route 9 East) toward Framingham
•		Follow “From Route 9 East”

     

			Here’s how to order a copy of the proxy materials and select a future delivery preference:
			Paper copies: Current and future paper delivery requests can be submitted via the telephone, Internet or email options below.
			Email copies: Current and future email delivery requests must be submitted via the Internet following the instructions below.
			If you request an email copy of current materials you will receive an email with a link to the materials.
			PLEASE NOTE: You must use the number in the shaded bar on the reverse side when requesting a set of proxy materials.
			→			Internet – Go to www.envisionreports.com/CGNX. Click Cast Your Vote or Request Materials. Follow the instructions to log in and order a paper or email copy of the current meeting materials and submit your preference for email or paper delivery of future meeting materials. You will be able to vote electronically until 1:00 a.m. EDT on April 27, 2011.
			→			Telephone – Call us free of charge at 1-866-641-4276 using a touch-tone phone and follow the instructions to log in and order a paper copy of the materials by mail for the current meeting. You can also submit a preference to receive a paper copy for future meetings.
			→			Email – Send email to investorvote@computershare.com with “Proxy Materials Cognex Corporation” in the subject line. Include in the message your full name and address, plus the number located in the shaded bar on the reverse, and state in the email that you want a paper copy of current meeting materials. You can also state your preference to receive a paper copy for future meetings.
						To facilitate timely delivery, all requests for a paper copy of the proxy materials must be received by April 13, 2011.
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