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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	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
1206641	A Richard Damore	C/O North Bridge Growth Equity 950 Winter Street, Suite 4600 Waltham MA 02454	No	No	Yes	No
1218581	T Edward Anderson	C/O North Bridge Growth Equity 950 Winter Street, Suite 4600 Waltham MA 02454	No	No	Yes	No
1390657	North Bridge Growth Equity I Lp	C/O North Bridge Growth Equity 950 Winter Street, Suite 4600 Waltham MA 02454	No	No	Yes	No
1542779	Nbge Manager, Llc	C/O North Bridge Growth Equity 950 Winter Street, Suite 4600 Waltham MA 02454	Yes	No	Yes	No
1542781	Nbge Gp, Llc	C/O North Bridge Growth Equity 950 Winter Street, Suite 4600 Waltham MA 02454	No	No	Yes	No
1542785	North Bridge Growth Management, L.p.	C/O North Bridge Growth Equity 950 Winter Street, Suite 4600 Waltham MA 02454	No	No	Yes	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	2012-02-29	5,991,790	$0.00	5,991,790	No	4	C	Indirect	By North Bridge Growth Equity I, L.P.
Common Stock	Acquisiton	2012-02-29	430,000	$16.00	6,421,790	No	4	P	Indirect	By North Bridge Growth Equity I, L.P.

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

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Series A Preferred Stock	Disposition	2012-02-29	427,985	$0.00	5,991,790	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0			No	4	C	Indirect

Footnotes

Upon the closing of the Issuer's initial public offering, each of the 427,985 shares of Series A Preferred Stock automatically converted into shares of the Issuer's Common Stock on a 14-for-1 basis.
Represents shares held directly by North Bridge Growth Equity I, L.P. NBGE Manager, LLC ("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. Douglas 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, Mr. Anderson and Mr. D'Amore each disclaim any beneficial ownership of such shares, except to the extent of any pecuniary interest therein. This report shall not be deemed an admission that any of the reporting persons is the beneficial owner of such securities for purposes of Section 16 or for any other purpose.
The security does not have an expiration date.