Proto Labs Inc (PRLB)

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Institutional Investors' Holdings

Filing Period:

No.	Name	Shares	Value	% Port
1.	Blackrock, Inc.	4,010,702	$156,778,340	0%
2.	Vanguard Group Inc	2,863,376	$111,929,367	0%
3.	Disciplined Growth Investors Inc	2,173,699	$84,969,894	1.61%
4.	Dimensional Fund Advisors Lp	1,300,864	$50,851,333	0.01%
5.	State Street Corp	1,149,020	$44,915,192	0%