SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person* ROCKWELL S KENT (Last) (First) (Middle) 127 INDUSTRY BOULEVARD (Street) NORTH HUNTINGDON PA 15642 (City) (State) (Zip)	2. Date of Event Requiring Statement (Month/Day/Year) 02/06/2013	3. Issuer Name and Ticker or Trading Symbol ExOne Co [ XONE ]
		4. Relationship of Reporting Person(s) to Issuer (Check all applicable) X Director X 10% Owner X Officer (give title below) Other (specify below) Chair and CEO	5. If Amendment, Date of Original Filed (Month/Day/Year)
			6. Individual or Joint/Group Filing (Check Applicable Line) X Form filed by One Reporting Person Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock, par value $0.01	4,176,000	I	By S. Kent Rockwell Revocable Trust(1)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Class A Preferred Stock	01/01/2013	02/12/2013	Common Stock	1,366,694	$0	I	By S. Kent Rockwell Revocable Trust(2)

Explanation of Responses:

1. S. Kent Rockwell is the beneficiary of the S. Kent Rockwell Revocable Trust which is the indirect sole stockholder of Rockwell Forest Products, Inc., the record holder of the shares. This filing includes Rockwell Forest Products as a 10% holder.

2. S. Kent Rockwell is the beneficiary of the S. Kent Rockwell Revocable Trust which is the indirect sole stockholder of Rockwell Holdings, Inc., the record holder of the preferred stock.

	/s/ S. Kent Rockwell	02/06/2013
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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