<SEC-DOCUMENT>0001193125-15-220610-index.html : 20150611
<SEC-HEADER>0001193125-15-220610.hdr.sgml : 20150611
<ACCEPTANCE-DATETIME>20150611162935
ACCESSION NUMBER:		0001193125-15-220610
CONFORMED SUBMISSION TYPE:	SC 13D/A
PUBLIC DOCUMENT COUNT:		3
FILED AS OF DATE:		20150611
DATE AS OF CHANGE:		20150611
GROUP MEMBERS:		MARY JO SCHULER
GROUP MEMBERS:		STEPHEN G. SCHULER

SUBJECT COMPANY:	

	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:		SC 13D/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-87533
		FILM NUMBER:		15926307

	BUSINESS ADDRESS:	
		STREET 1:		545 WASHINGTON BOULEVARD
		CITY:			JERSEY CITY
		STATE:			NJ
		ZIP:			07310
		BUSINESS PHONE:		201-222-9400

	MAIL ADDRESS:	
		STREET 1:		545 WASHINGTON BOULEVARD
		CITY:			JERSEY CITY
		STATE:			NJ
		ZIP:			07310

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Knight Holdco, Inc.
		DATE OF NAME CHANGE:	20130211

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Serenity Investments, LLC
		CENTRAL INDEX KEY:			0001580396
		IRS NUMBER:				204848838
		STATE OF INCORPORATION:			AK
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13D/A

	BUSINESS ADDRESS:	
		STREET 1:		830 NORTH BLVD.
		CITY:			OAK PARK
		STATE:			IL
		ZIP:			60301
		BUSINESS PHONE:		708-725-7014

	MAIL ADDRESS:	
		STREET 1:		830 NORTH BLVD.
		CITY:			OAK PARK
		STATE:			IL
		ZIP:			60301
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13D/A
<SEQUENCE>1
<FILENAME>d941604dsc13da.htm
<DESCRIPTION>AMENDMENT NO. 10 TO SCHEDULE 13D
<TEXT>
Document 1 - file: d941604dsc13da.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.3
<SEQUENCE>2
<FILENAME>d941604dex993.htm
<DESCRIPTION>EX-99.3
<TEXT>
Document 2 - file: d941604dex993.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.4
<SEQUENCE>3
<FILENAME>d941604dex994.htm
<DESCRIPTION>EX-99.4
<TEXT>
Document 3 - file: d941604dex994.htm

</DOCUMENT>
</SEC-DOCUMENT>