<SEC-DOCUMENT>0000950123-17-001522-index.html : 20170210
<SEC-HEADER>0000950123-17-001522.hdr.sgml : 20170210
<ACCEPTANCE-DATETIME>20170210165133
ACCESSION NUMBER:		0000950123-17-001522
CONFORMED SUBMISSION TYPE:	13F-HR
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20161231
FILED AS OF DATE:		20170210
DATE AS OF CHANGE:		20170210
EFFECTIVENESS DATE:		20170210

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			KCG Holdings, Inc.
		CENTRAL INDEX KEY:			0001569391
		STANDARD INDUSTRIAL CLASSIFICATION:	SECURITY BROKERS, DEALERS & FLOTATION COMPANIES [6211]
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		13F-HR
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	028-15626
		FILM NUMBER:		17594261

	BUSINESS ADDRESS:	
		STREET 1:		300 VESEY STREET
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10282
		BUSINESS PHONE:		646-682-6000

	MAIL ADDRESS:	
		STREET 1:		300 VESEY STREET
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10282

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Knight Holdco, Inc.
		DATE OF NAME CHANGE:	20130211
</SEC-HEADER>
<DOCUMENT>
<TYPE>13F-HR
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
Document 1 - file: primary_doc.html

Document 1 - RAW XML: primary_doc.xml

</DOCUMENT>
<DOCUMENT>
<TYPE>INFORMATION TABLE
<SEQUENCE>2
<FILENAME>form13fInfoTable.xml
<DESCRIPTION>INFORMATION TABLE FOR FORM 13F
<TEXT>
Document 2 - file: form13fInfoTable.html

Document 2 - RAW XML: form13fInfoTable.xml

</DOCUMENT>
</SEC-DOCUMENT>