<SEC-DOCUMENT>0001193125-17-209504-index.html : 20170621
<SEC-HEADER>0001193125-17-209504.hdr.sgml : 20170621
<ACCEPTANCE-DATETIME>20170621171808
ACCESSION NUMBER:		0001193125-17-209504
CONFORMED SUBMISSION TYPE:	DEFA14A
PUBLIC DOCUMENT COUNT:		3
FILED AS OF DATE:		20170621
DATE AS OF CHANGE:		20170621
EFFECTIVENESS DATE:		20170621

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:		DEFA14A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-54991
		FILM NUMBER:		17923486

	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>DEFA14A
<SEQUENCE>1
<FILENAME>d377695d8k.htm
<DESCRIPTION>FORM 8-K
<TEXT>
Document 1 - file: d377695d8k.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>2
<FILENAME>d377695dex991.htm
<DESCRIPTION>EX-99.1
<TEXT>
Document 2 - file: d377695dex991.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>g377695002.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 3 - file: g377695002.jpg

</DOCUMENT>
</SEC-DOCUMENT>