UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a)

of the Securities Exchange Act of 1934

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☐ Preliminary Proxy Statement

☐ Confidential, for Use of the Commission Only (as

permitted by Rule 14a-6(e)(2))

☐ Definitive Proxy Statement

☒ Definitive Additional Materials

☐ Soliciting Material Pursuant to §240.14a-12

The ExOne Company

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

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*** Exercise Your Right to Vote ***

Important Notice Regarding the Availability of Proxy Materials for the

Shareholder Meeting to Be Held on May 15, 2019.

			Meeting Information
	THE EXONE COMPANY		Meeting Type:          Annual Meeting
			For holders as of:     March 18, 2019
			Date:  May 15, 2019	Time: 10:00 AM EDT
			Location:   The ExOne Company
			127 Industry Boulevard               North Huntingdon, Pennsylvania 15642
		You are receiving this communication because you hold shares in the company named above. This is not a ballot. You cannot use this notice to vote these shares. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. You may view the proxy materials online at www.proxyvote.com or easily request a paper copy (see reverse side). We encourage you to access and review all of the important information contained in the proxy materials before voting.
			See the reverse side of this notice to obtain proxy materials and voting instructions.

— Before You Vote —

How to Access the Proxy Materials

	Proxy Materials Available to VIEW or RECEIVE:
	NOTICE AND PROXY STATEMENT             2018 ANNUAL REPORT
	How to View Online: Have the information that is printed in the box marked by the arrow (located on the following page) and visit: www.proxyvote.com.
	How to Request and Receive a PAPER or E-MAIL Copy:
	If you want to receive a paper or e-mail copy of these documents, you must request one. There is NO charge for requesting a copy. Please choose one of the following methods to make your request:
	1) BY INTERNET:	www.proxyvote.com
	2) BY TELEPHONE:	1-800-579-1639
	3) BY E-MAIL*:	sendmaterial@proxyvote.com
	*   If requesting materials by e-mail, please send a blank e-mail with the information that is printed in the box marked by the arrow (located on the following page) in the subject line.
	Requests, instructions and other inquiries sent to this e-mail address will NOT be forwarded to your investment advisor. Please make the request as instructed above on or before May 1, 2019 to facilitate timely delivery.
	— How To Vote — Please Choose One of the Following Voting Methods
	Vote In Person: If you choose to vote these shares in person at the meeting, you must request a “legal proxy.” To do so, please follow the instructions at www.proxyvote.com or request a paper copy of the materials, which will contain the appropriate instructions. Many shareholder meetings have attendance requirements including, but not limited to, the possession of an attendance ticket issued by the entity holding the meeting. Please check the meeting materials for any special requirements for meeting attendance.
	Vote By Internet: To vote now by Internet, go to www.proxyvote.com. Have the information that is printed in the box marked by the arrow (located on the following page) available and follow the instructions. Vote By Mail: You can vote by mail by requesting a paper copy of the materials, which will include a voting instruction form.

		Voting Items
	The Board of Directors recommends you vote FOR the following proposals:
	1.  Election of Directors. The nominees are: Nominees: 1a.   S. Kent Rockwell		2.  Ratification of the appointment of Schneider Downs & Co., Inc. as the Company’s independent registered public accounting firm for the year ending December 31, 2019.
	1b.  John Irvin		3.  Approval of amendment to Certificate of Incorporation.
	1c.   Gregory F. Pashke		4.  Non-binding advisory vote to approve the compensation paid to named executive officers in 2018.
	1d.  Lloyd A. Semple		The Board of Directors recommends you vote 1 YEAR on the following proposal:
	1e.   William F. Strome		5.  Non-binding advisory vote on frequency of future advisory votes on compensation of named executive officers.
	1f.   Roger W. Thiltgen
	1g.  Bonnie K. Wachtel		NOTE: Such other business as may properly come before the meeting or any adjournment thereof.

	Voting Instructions