<SEC-DOCUMENT>0001104659-19-007982-index.html : 20190213
<SEC-HEADER>0001104659-19-007982.hdr.sgml : 20190213
<ACCEPTANCE-DATETIME>20190213170736
ACCESSION NUMBER:		0001104659-19-007982
CONFORMED SUBMISSION TYPE:	SC 13G
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20190213
DATE AS OF CHANGE:		20190213
GROUP MEMBERS:		ARBORETUM INVESTMENT MANAGER IV, LLC
GROUP MEMBERS:		JAN L. GARFINKLE
GROUP MEMBERS:		PAUL MCCREADIE
GROUP MEMBERS:		TIMOTHY B. PETERSEN

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SI-BONE, Inc.
		CENTRAL INDEX KEY:			0001459839
		STANDARD INDUSTRIAL CLASSIFICATION:	SURGICAL & MEDICAL INSTRUMENTS & APPARATUS [3841]
		IRS NUMBER:				262216351
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-90888
		FILM NUMBER:		19598507

	BUSINESS ADDRESS:	
		STREET 1:		471 EL CAMINO REAL, SUITE 101
		CITY:			SANTA CLARA
		STATE:			CA
		ZIP:			95050
		BUSINESS PHONE:		4082070700

	MAIL ADDRESS:	
		STREET 1:		471 EL CAMINO REAL, SUITE 101
		CITY:			SANTA CLARA
		STATE:			CA
		ZIP:			95050

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	SI-Bone Inc.
		DATE OF NAME CHANGE:	20090326

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Arboretum Ventures IV, L.P.
		CENTRAL INDEX KEY:			0001645597
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G

	BUSINESS ADDRESS:	
		STREET 1:		303 DETROIT STREET, SUITE 301
		CITY:			ANN ARBOR
		STATE:			MI
		ZIP:			48104
		BUSINESS PHONE:		734-998-3688

	MAIL ADDRESS:	
		STREET 1:		303 DETROIT STREET, SUITE 301
		CITY:			ANN ARBOR
		STATE:			MI
		ZIP:			48104
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G
<SEQUENCE>1
<FILENAME>a19-4584_1sc13g.htm
<DESCRIPTION>SC 13G
<TEXT>
Document 1 - file: a19-4584_1sc13g.htm

</DOCUMENT>
</SEC-DOCUMENT>