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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
1197537	A Douglas Kingsley	C/O North Bridge Growth Equity 950 Winter Street, Suite 4600 Waltham MA 02454		Yes	No	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	Disposition	2012-11-21	1,417,500	$31.00	3,404,290	No	4	S	Indirect	By North Bridge Growth Equity I, L.P.

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Indirect	By North Bridge Growth Equity I, L.P.

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	4,976	Direct

Footnotes

Represents shares held directly by North Bridge Growth Equity I, L.P. NBGE is the managing manager of NBGE GP, LLC, which is the sole general partner of North Bridge Growth Management, L.P., which is the sole general partner of North Bridge Growth Equity I, L.P. NBGE has sole vesting and dispositive power over such shares. Mr. Kingsley, a director of the Issuer, is a founding managing director of NBGE GP, LLC. Shared voting and investment power over such shares is vested in the managers of NBGE, Edward Anderson and Richard D'Amore. Mr. Kingsley disclaims any beneficial ownership of such shares, except to the extent of any pecuniary interest therein. This report shall not be deemed an admission that the reporting person is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.
This transaction is also reported on a separate Form 4 filed by North Bridge Growth Equity I, L.P. on November 21, 2012.