SEC Form 4

FORM 4		UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response: 0.5
	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person* Cleveland Bradley A. (Last) (First) (Middle) 5540 PIONEER CREEK DRIVE (Street) MAPLE PLAIN MN 55359 (City) (State) (Zip)	2. Issuer Name and Ticker or Trading Symbol Proto Labs Inc [ PRLB ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X Director 10% Owner X Officer (give title below) Other (specify below) President and CEO
	3. Date of Earliest Transaction (Month/Day/Year) 03/19/2013
	4. 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 Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	03/19/2013		S(1)		1,107	D	$45.11(2)	93,393	I	By JMC Irrevocable Gift Trust(3)
Common Stock	03/19/2013		S(1)		1,107	D	$45.11(2)	93,393	I	By KEC Irrevocable Gfit Trust(3)
Common Stock	03/19/2013		S(1)		1,298	D	$45.11(2)	674,884	I	By Bradley A. Cleveland Declaration Trust
Common Stock	03/19/2013		S(1)		52,436	D	$45.51(4)	40,957	I	By JMC Irrevocable Gift Trust(3)
Common Stock	03/19/2013		S(1)		52,436	D	$45.51(4)	40,957	I	By KEC Irrevocable Gfit Trust(3)
Common Stock	03/19/2013		S(1)		61,593	D	$45.51(4)	613,291	I	By Bradley A. Cleveland Declaration Trust
Common Stock	03/19/2013		S(1)		21,458	D	$46.94(5)	19,499	I	By JMC Irrevocable Gift Trust(3)
Common Stock	03/19/2013		S(1)		21,458	D	$46.94(5)	19,499	I	By KEC Irrevocable Gfit Trust(3)
Common Stock	03/19/2013		S(1)		25,204	D	$46.94(5)	588,087	I	By Bradley A. Cleveland Declaration Trust
Common Stock	03/20/2013		S(1)		19,499	D	$45.88(6)	0	I	By JMC Irrevocable Gift Trust(3)
Common Stock	03/20/2013		S(1)		19,499	D	$45.88(6)	0	I	By KEC Irrevocable Gfit Trust(3)
Common Stock	03/20/2013		S(1)		22,905	D	$45.88(6)	565,182	I	By Bradley A. Cleveland Declaration Trust
Common Stock	03/20/2013		S(1)		200,000	D	$45.82(7)	365,182	I	By Bradley A. Cleveland Declaration Trust
Common Stock								100,000	I	By JK Cleveland Irrevocable Trust(8)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Sales effected pursuant to a Rule 10b5-1 trading plan (the "Trading Plan") adopted on February 15, 2013 by the Bradley A. Cleveland Declaration Trust (the "BAC Trust"), JMC 2011 Irrevocable Gift Trust (the "JMC Trust") and KEC 2011 Irrevocable Gift Trust (the "KEC Trust") and (collectively referred to as the "Trusts"). Pursuant to the terms of the Trading Plan, the allocation of shares to be sold is approximately 37% for the BAC Trust, 31.5% for the JMC Trust and 31.5% for the KEC Trust except as provided in footnote 7 below. The sales reflected on this Form 4 conclude the transactions contemplated by the Trading Plan.

2. Reflects the weighted average price of 3,512 shares of common stock of Proto Labs, Inc. sold by the Trusts in multiple transactions on March 19, 2013 with sale prices ranging from $45.10 to $45.16 per share. The reporting person undertakes to provide upon request by the U.S. Securities and Exchange Commission staff, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.

3. The reporting person has no voting rights over the shares and disclaims beneficial ownership.

4. Reflects the weighted average price of 166,465 shares of common stock of Proto Labs, Inc. sold by the Trusts in multiple transactions on March 19, 2013 with sale prices ranging from $45.19 to $46.19 per share. The reporting person undertakes to provide upon request by the U.S. Securities and Exchange Commission staff, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.

5. Reflects the weighted average price of 68,120 shares of common stock of Proto Labs, Inc. sold by the Trusts in multiple transactions on March 19, 2013 with sale prices ranging from $46.27 to $47.23 per share. The reporting person undertakes to provide upon request by the U.S. Securities and Exchange Commission staff, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.

6. Reflects the weighted average price of 61,903 shares of common stock of Proto Labs, Inc. sold by the Trusts in multiple transactions on March 20, 2013 with sale prices ranging from $45.70 to $45.97 per share. The reporting person undertakes to provide upon request by the U.S. Securities and Exchange Commission staff, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.

7. Reflects the weighted average price of 200,000 shares of common stock of Proto Labs, Inc. sold by the BAC Trust in multiple transactions on March 20, 2013 with sale prices ranging from $45.45 to $46.36 per share. The reporting person undertakes to provide upon request by the U.S. Securities and Exchange Commission staff, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price.

8. These shares are held indirectly by a trust for the benefit of the reporting person's children. The reporting person is a trustee of the trust. The reporting person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest in them.

Remarks:

	/s/ Julie M. Regnier, Attorney-in-Fact for Bradley A. Cleveland	03/21/2013
	** 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 4 (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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