<SEC-DOCUMENT>0001127602-17-018056.txt : 20170515
<SEC-HEADER>0001127602-17-018056.hdr.sgml : 20170515
<ACCEPTANCE-DATETIME>20170515152628
ACCESSION NUMBER:		0001127602-17-018056
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20170512
FILED AS OF DATE:		20170515
DATE AS OF CHANGE:		20170515

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CHARLES RIVER LABORATORIES INTERNATIONAL INC
		CENTRAL INDEX KEY:			0001100682
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-COMMERCIAL PHYSICAL & BIOLOGICAL RESEARCH [8731]
		IRS NUMBER:				061397316
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		251 BALLARDVALE ST
		CITY:			WILMINGTON
		STATE:			MA
		ZIP:			01887
		BUSINESS PHONE:		781-222-6000

	MAIL ADDRESS:	
		STREET 1:		251 BALLARDVALE ST
		CITY:			WILMINGTON
		STATE:			MA
		ZIP:			01887

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	CHARLES RIVER LABORATORIES HOLDINGS INC
		DATE OF NAME CHANGE:	19991208

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			MASSARO GEORGE
		CENTRAL INDEX KEY:			0001221496

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-15943
		FILM NUMBER:		17843766
</SEC-HEADER>
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    <footnotes>
        <footnote id="F1">Consists of 2,436 unvested restricted stock units that vest upon the earlier of 5/12/2018, or the business day prior to the Company's next annual meeting of shareholders.</footnote>
        <footnote id="F2">This sale occurred pursuant to a 10b5-1 Trading Plan.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ George E. Massaro</signatureName>
        <signatureDate>2017-05-15</signatureDate>
    </ownerSignature>
</ownershipDocument>
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</SEC-DOCUMENT>
