<SEC-DOCUMENT>0000945621-25-001058.txt : 20251112
<SEC-HEADER>0000945621-25-001058.hdr.sgml : 20251112
<ACCEPTANCE-DATETIME>20251112113745
ACCESSION NUMBER:		0000945621-25-001058
CONFORMED SUBMISSION TYPE:	SCHEDULE 13G
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20251112
DATE AS OF CHANGE:		20251112

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			OSI SYSTEMS INC
		CENTRAL INDEX KEY:			0001039065
		STANDARD INDUSTRIAL CLASSIFICATION:	SEMICONDUCTORS & RELATED DEVICES [3674]
		ORGANIZATION NAME:           	04 Manufacturing
		EIN:				330238801
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0630

	FILING VALUES:
		FORM TYPE:		SCHEDULE 13G
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-53245
		FILM NUMBER:		251470849

	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

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Mawer Investment Management Ltd.
		CENTRAL INDEX KEY:			0001538449
		ORGANIZATION NAME:           	
		EIN:				000000000
		STATE OF INCORPORATION:			A0
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SCHEDULE 13G

	BUSINESS ADDRESS:	
		STREET 1:		517 10TH AVENUE S. W.
		STREET 2:		SUITE 600
		CITY:			CALGARY
		STATE:			A0
		ZIP:			T2R 0A8
		BUSINESS PHONE:		403-262-4673

	MAIL ADDRESS:	
		STREET 1:		517 10TH AVENUE S. W.
		STREET 2:		SUITE 600
		CITY:			CALGARY
		STATE:			A0
		ZIP:			T2R 0A8
</SEC-HEADER>
<DOCUMENT>
<TYPE>SCHEDULE 13G
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
<XML>
<?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/schedule13g" xmlns:com="http://www.sec.gov/edgar/common">
<headerData>
<submissionType>SCHEDULE 13G</submissionType>
<filerInfo>
<filer>
<filerCredentials>
<cik>0001538449</cik>
<ccc>XXXXXXXX</ccc>
</filerCredentials>
</filer>
<liveTestFlag>LIVE</liveTestFlag>



</filerInfo>
</headerData>
<formData>
<coverPageHeader>
<securitiesClassTitle>Common Stock</securitiesClassTitle>
<eventDateRequiresFilingThisStatement>09/30/2025</eventDateRequiresFilingThisStatement>
<issuerInfo>
<issuerCik>0001039065</issuerCik>
<issuerName>OSI SYSTEMS INC</issuerName>
<issuerCusip>671044105</issuerCusip>
<issuerPrincipalExecutiveOfficeAddress>
<com:street1>12525 Chadron Ave.</com:street1>
<com:city>Hawthorne</com:city>
<com:stateOrCountry>CA</com:stateOrCountry>
<com:zipCode>90250</com:zipCode>
</issuerPrincipalExecutiveOfficeAddress>
</issuerInfo>
<designateRulesPursuantThisScheduleFiled>
<designateRulePursuantThisScheduleFiled>Rule 13d-1(b)</designateRulePursuantThisScheduleFiled>
</designateRulesPursuantThisScheduleFiled>
</coverPageHeader>
<coverPageHeaderReportingPersonDetails>

<reportingPersonName>Mawer Investment Management Ltd.</reportingPersonName>
<citizenshipOrOrganization>A0</citizenshipOrOrganization>
<reportingPersonBeneficiallyOwnedNumberOfShares>
<soleVotingPower>856383</soleVotingPower>
<sharedVotingPower>0</sharedVotingPower>
<soleDispositivePower>856383</soleDispositivePower>
<sharedDispositivePower>0</sharedDispositivePower>
</reportingPersonBeneficiallyOwnedNumberOfShares>
<reportingPersonBeneficiallyOwnedAggregateNumberOfShares>856383</reportingPersonBeneficiallyOwnedAggregateNumberOfShares>
<aggregateAmountExcludesCertainSharesFlag>N</aggregateAmountExcludesCertainSharesFlag>
<classPercent>5.09</classPercent>
<typeOfReportingPerson>IA</typeOfReportingPerson>
<comments>Based upon 16,825,913 Common Shares of OSI Systems, Inc. (the "Issuer") outstanding as of August 18, 2025, as reported in the Issuer's Form 10-K (Quarterly Report) filed with the Securiities and Exchange Commission on August 25, 2025.</comments>
</coverPageHeaderReportingPersonDetails>
<items>
<item1>
<issuerName>OSI SYSTEMS INC</issuerName>
<issuerPrincipalExecutiveOfficeAddress>12525 Chadron Ave., Hawthorne, California, 90250</issuerPrincipalExecutiveOfficeAddress>
</item1>
<item2>
<filingPersonName>Mawer Investment Management Ltd.</filingPersonName>
<principalBusinessOfficeOrResidenceAddress>600, 517 - 10th Avenue SW&#13;
Calgary, Alberta, Canada T2R 0A8</principalBusinessOfficeOrResidenceAddress>
<citizenship>Canada</citizenship>
</item2>
<item3>
<notApplicableFlag>N</notApplicableFlag>
<typeOfPersonFiling>IA</typeOfPersonFiling>
</item3>
<item4>
<amountBeneficiallyOwned>856,383</amountBeneficiallyOwned>
<classPercent>5.09</classPercent>
<numberOfSharesPersonHas>
<solePowerOrDirectToVote>856,383</solePowerOrDirectToVote>
<sharedPowerOrDirectToVote>0</sharedPowerOrDirectToVote>
<solePowerOrDirectToDispose>856,383</solePowerOrDirectToDispose>
<sharedPowerOrDirectToDispose>0</sharedPowerOrDirectToDispose>
</numberOfSharesPersonHas>
</item4>
<item5>
<notApplicableFlag>Y</notApplicableFlag>
</item5>
<item6>
<notApplicableFlag>Y</notApplicableFlag>
</item6>
<item7>
<notApplicableFlag>Y</notApplicableFlag>
</item7>
<item8>
<notApplicableFlag>Y</notApplicableFlag>
</item8>
<item9>
<notApplicableFlag>Y</notApplicableFlag>
</item9>
<item10>
<notApplicableFlag>N</notApplicableFlag>
<certifications>By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.</certifications>
</item10>
</items>
<signatureInformation>
<reportingPersonName>Mawer Investment Management Ltd.</reportingPersonName>
<signatureDetails>
<signature>/s/ John Wilson</signature>
<title>John Wilson, Portfolio Manager</title>
<date>11/05/2025</date>
</signatureDetails>
</signatureInformation>
</formData>
</edgarSubmission>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
