<SEC-DOCUMENT>0000053417-19-000068-index.html : 20190201
<SEC-HEADER>0000053417-19-000068.hdr.sgml : 20190201
<ACCEPTANCE-DATETIME>20190201145735
ACCESSION NUMBER:		0000053417-19-000068
CONFORMED SUBMISSION TYPE:	SC 13G/A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20190201
DATE AS OF CHANGE:		20190201

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Summit Materials, Inc.
		CENTRAL INDEX KEY:			0001621563
		STANDARD INDUSTRIAL CLASSIFICATION:	MINING, QUARRYING OF NONMETALLIC MINERALS (NO FUELS) [1400]
		IRS NUMBER:				471984212
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1227

	FILING VALUES:
		FORM TYPE:		SC 13G/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-88815
		FILM NUMBER:		19559431

	BUSINESS ADDRESS:	
		STREET 1:		1550 WYNKOOP STREET, 3RD FLOOR
		CITY:			DENVER
		STATE:			CO
		ZIP:			80202
		BUSINESS PHONE:		303-893-0012

	MAIL ADDRESS:	
		STREET 1:		1550 WYNKOOP STREET, 3RD FLOOR
		CITY:			DENVER
		STATE:			CO
		ZIP:			80202

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			JENNISON ASSOCIATES LLC
		CENTRAL INDEX KEY:			0000053417
		IRS NUMBER:				132631108
		STATE OF INCORPORATION:			NY
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G/A

	BUSINESS ADDRESS:	
		STREET 1:		466 LEXINGTON AVE
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10017
		BUSINESS PHONE:		2124211000

	MAIL ADDRESS:	
		STREET 1:		466 LEXINGTON AVE
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10017

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	JENNISON ASSOCIATES CAPITAL CORP
		DATE OF NAME CHANGE:	19940511
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G/A
<SEQUENCE>1
<FILENAME>sum1218.txt
<DESCRIPTION>13G AMENDED ANNUAL FILING - SUM
<TEXT>
Document 1 - file: sum1218.txt

</DOCUMENT>
</SEC-DOCUMENT>