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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1443669	Proto Labs Inc	PRLB	Fabricated Structural Metal Products (3440)	000000000

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1542476	R. Mark Kubicek	5540 Pioneer Creek Drive Maple Plain MN 55359	Executive Vice President	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Stock	Acquisiton	2012-09-04	18,016	$0.50	178,016	No	4	M	Direct
Common Stock	Disposition	2012-09-04	18,016	$30.91	160,000	No	4	S	Direct
Common Stock	Acquisiton	2012-09-05	25,677	$0.50	185,677	No	4	M	Direct
Common Stock	Disposition	2012-09-05	25,677	$30.64	160,000	No	4	S	Direct
Common Stock	Acquisiton	2012-09-06	6,307	$0.50	166,307	No	4	M	Direct
Common Stock	Disposition	2012-09-06	6,307	$31.00	160,000	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
No	4	S	Direct
No	4	M	Direct
No	4	S	Direct
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Employee Stock Option (right to buy)	Disposition	2012-09-04	18,016	$0.00	18,016	$0.50
Common Stock	Employee Stock Option (right to buy)	Disposition	2012-09-05	25,677	$0.00	25,677	$0.50
Common Stock	Employee Stock Option (right to buy)	Disposition	2012-09-06	6,307	$0.00	6,307	$0.50

Remaning Holdings	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
31,984	2013-02-28	No	4	M	Direct
6,307	2013-02-28	No	4	M	Direct
0	2013-02-28	No	4	M	Direct

Footnotes

Transaction effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on July 30, 2012.
Reflects the weighted average price of 18,016 shares of common stock of Proto Labs, Inc. sold by the reporting person in multiple transactions on September 4, 2012 with sale prices ranging from $30.80 to $31.10 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.
Reflects the weighted average price of 25,677 shares of common stock of Proto Labs, Inc. sold by the reporting person in multiple transactions on September 5, 2012 with sale prices ranging from $30.40 to $30.97 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.
Reflects the weighted average price of 6,307 shares of common stock of Proto Labs, Inc. sold by the reporting person in multiple transactions on September 6, 2012 with sale prices ranging from $31.00 to $31.07 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.
Fully vested.