xone-defa14a_20200513.htm

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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 13, 2020. Meeting Information THE EXONE COMPANY Meeting Type: Annual Meeting For holders as of: March 16, 2020 Date: May 13, 2020 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. E94623-P34664 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 2019 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. . XXXX XXXX XXXX XXXX . XXXX XXXX XXXX XXXX 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, 2020 to facilitate timely delivery. How To Vote E94624-P34664 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 XXXX XXXX XXXX XXXX (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.

The Board of Directors recommends you vote FOR the following proposals: 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, 2020. 1. Election of Directors. The nominees are: Nominees: 1a. S. Kent Rockwell 3. Approval of amendment to Certificate of Incorporation to provide for stockholder removal of directors with or without cause. 1b. John F. Hartner 4. Approval, on a non-binding advisory basis, of the compensation paid to named executive officers in 2019. 1c. John Irvin 1d. Gregory F. Pashke NOTE: Such other business as may properly come before the meeting or any adjournment thereof. 1e. Lloyd A. Semple 1f. William F. Strome 1g. Roger W. Thiltgen E94625-P34664 1h. Bonnie K. Wachtel