<SEC-DOCUMENT>0001258897-18-000973-index.html : 20180209
<SEC-HEADER>0001258897-18-000973.hdr.sgml : 20180209
<ACCEPTANCE-DATETIME>20180209080840
ACCESSION NUMBER:		0001258897-18-000973
CONFORMED SUBMISSION TYPE:	SC 13G
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20180209
DATE AS OF CHANGE:		20180209

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SemGroup Corp
		CENTRAL INDEX KEY:			0001489136
		STANDARD INDUSTRIAL CLASSIFICATION:	OIL, GAS FIELD SERVICES, NBC [1389]
		IRS NUMBER:				203533152
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-85990
		FILM NUMBER:		18587827

	BUSINESS ADDRESS:	
		STREET 1:		TWO WARREN PLACE
		STREET 2:		6120 SOUTH YALE AVENUE, SUITE 1500
		CITY:			TULSA
		STATE:			OK
		ZIP:			74136-4231
		BUSINESS PHONE:		918-524-8100

	MAIL ADDRESS:	
		STREET 1:		TWO WARREN PLACE
		STREET 2:		6120 SOUTH YALE AVENUE, SUITE 1500
		CITY:			TULSA
		STATE:			OK
		ZIP:			74136-4231

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			DIMENSIONAL FUND ADVISORS LP
		CENTRAL INDEX KEY:			0000354204
		STANDARD INDUSTRIAL CLASSIFICATION:	UNKNOWN SIC - 0000 [0000]
		IRS NUMBER:				222370029
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G

	BUSINESS ADDRESS:	
		STREET 1:		6300 BEE CAVE ROAD
		STREET 2:		BUILDING ONE
		CITY:			AUSTIN
		STATE:			TX
		ZIP:			78746
		BUSINESS PHONE:		(512) 306-7400

	MAIL ADDRESS:	
		STREET 1:		6300 BEE CAVE ROAD
		STREET 2:		BUILDING ONE
		CITY:			AUSTIN
		STATE:			TX
		ZIP:			78746

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	DIMENSIONAL FUND ADVISORS INC
		DATE OF NAME CHANGE:	19920929
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G
<SEQUENCE>1
<FILENAME>dfs122.htm
<DESCRIPTION>SCHEDULE 13G
<TEXT>
Document 1 - file: dfs122.htm

</DOCUMENT>
</SEC-DOCUMENT>