Proto Labs Inc (PRLB)

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Institutional Investors' Holdings

Filing Period:

No.	Name	Shares	Value	% Port
1.	Blackrock, Inc.	3,864,146	$135,399,677	0%
2.	Vanguard Group Inc	2,825,585	$99,008,498	0%
3.	Disciplined Growth Investors Inc	2,670,718	$93,581,959	1.94%
4.	Dimensional Fund Advisors Lp	1,324,804	$46,421,425	0.01%
5.	State Street Corp	1,121,013	$39,280,296	0%