X0306 4 2016-08-24 0 0001561627 ExOne Co XONE 0001488755 McCarley James L 127 INDUSTRY BOULEVARD NORTH HUNTINGDON PA 15642 0 1 0 0 Chief Executive Officer Common Stock 2016-08-24 4 P 0 7200 14.27 A 7200 I See Footnote The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $14.15 to $14.38, inclusive. The reporting person undertakes to provide to The ExOne Company, any security holder of The ExOne Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. Shares are held by LLMG Holdings, LLC, which is jointly owned by the reporting person and his wife. /s/ JoEllen Lyons Dillon, attorney-in-fact for James L. McCarley 2016-08-25