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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
1536324	Iii R. Arthur Baker	5540 Pioneer Creek Drive Maple Plain MN 55359	Chief Technology Officer	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	Explanation
Common Stock	Acquisiton	2018-09-04	3,474	$60.96	20,020	No	4	M	Direct
Common Stock	Disposition	2018-09-04	3,474	$154.81	16,546	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
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	2018-09-04	3,474	$0.00	3,474	$60.96

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
5,211		2026-05-02	No	4	M	Direct

Footnotes

Reflects the weighted average price of 3,474 shares of common stock of Proto Labs, Inc. sold by the reporting person on September 4, 2018 with sale prices ranging from $154.55 to $155.10 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.
The option vests as to 20% of the shares in five annual installments beginning on May 4, 2017.