<SEC-DOCUMENT>0001104659-18-063053-index.html : 20181019
<SEC-HEADER>0001104659-18-063053.hdr.sgml : 20181019
<ACCEPTANCE-DATETIME>20181019162905
ACCESSION NUMBER:		0001104659-18-063053
CONFORMED SUBMISSION TYPE:	DEFA14A
PUBLIC DOCUMENT COUNT:		5
FILED AS OF DATE:		20181019
DATE AS OF CHANGE:		20181019
EFFECTIVENESS DATE:		20181019

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			OSI SYSTEMS INC
		CENTRAL INDEX KEY:			0001039065
		STANDARD INDUSTRIAL CLASSIFICATION:	SEMICONDUCTORS & RELATED DEVICES [3674]
		IRS NUMBER:				330238801
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0630

	FILING VALUES:
		FORM TYPE:		DEFA14A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-23125
		FILM NUMBER:		181130716

	BUSINESS ADDRESS:	
		STREET 1:		12525 CHADRON AVE
		CITY:			HAWTHORNE
		STATE:			CA
		ZIP:			90250
		BUSINESS PHONE:		3109780516

	MAIL ADDRESS:	
		STREET 1:		12525 CHADRON AVENUE
		CITY:			HAWTHORNE
		STATE:			CA
		ZIP:			90250
</SEC-HEADER>
<DOCUMENT>
<TYPE>DEFA14A
<SEQUENCE>1
<FILENAME>a18-36579_3defa14a.htm
<DESCRIPTION>DEFA14A
<TEXT>
Document 1 - file: a18-36579_3defa14a.htm

</DOCUMENT>
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<SEQUENCE>2
<FILENAME>g365793bci001.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 2 - file: g365793bci001.jpg

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<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>g365793bci002.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 3 - file: g365793bci002.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>g365793bci003.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: g365793bci003.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>g365793bci004.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 5 - file: g365793bci004.jpg

</DOCUMENT>
</SEC-DOCUMENT>