<SEC-DOCUMENT>0001437749-19-011115-index.html : 20190531
<SEC-HEADER>0001437749-19-011115.hdr.sgml : 20190531
<ACCEPTANCE-DATETIME>20190531100338
ACCESSION NUMBER:		0001437749-19-011115
CONFORMED SUBMISSION TYPE:	SD
PUBLIC DOCUMENT COUNT:		5
<RULE>
<RULE-NAME>13p-1
<ITEM>
<ITEM-NUMBER>1.01
<ITEM-PERIOD>20181231
</ITEM>
<ITEM>
<ITEM-NUMBER>1.02
<ITEM-PERIOD>20181231
</ITEM>
</RULE>
FILED AS OF DATE:		20190531
DATE AS OF CHANGE:		20190531

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Proto Labs Inc
		CENTRAL INDEX KEY:			0001443669
		STANDARD INDUSTRIAL CLASSIFICATION:	FABRICATED STRUCTURAL METAL PRODUCTS [3440]
		IRS NUMBER:				000000000
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SD
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-35435
		FILM NUMBER:		19868895

	BUSINESS ADDRESS:	
		STREET 1:		5540 Pioneer Creek
		CITY:			Maple Plain
		STATE:			MN
		ZIP:			55359
		BUSINESS PHONE:		763-479-7474

	MAIL ADDRESS:	
		STREET 1:		5540 Pioneer Creek
		CITY:			Maple Plain
		STATE:			MN
		ZIP:			55359
</SEC-HEADER>
<DOCUMENT>
<TYPE>SD
<SEQUENCE>1
<FILENAME>prlb20190516_sd.htm
<DESCRIPTION>FORM SD
<TEXT>
Document 1 - file: prlb20190516_sd.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-1.01
<SEQUENCE>2
<FILENAME>ex_145246.htm
<DESCRIPTION>EXHIBIT 1.01
<TEXT>
Document 2 - file: ex_145246.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>a1.jpg
<TEXT>
Document 3 - file: a1.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>a2.jpg
<TEXT>
Document 4 - file: a2.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>logo1.jpg
<TEXT>
Document 5 - file: logo1.jpg

</DOCUMENT>
</SEC-DOCUMENT>