UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549

Form 13F

Form 13F COVER PAGE

Report for the Calendar Year or Quarter Ended: June 30, 2011

Check here if Amendment [  ];   Amendment Number:
     This Amendment (Check only one.)	[  ] is a restatement.
				     	[  ] adds new holding entries.

Institutional Investment Manager Filing this Report:

Name: QCM Cayman Ltd. (formerly Quantlab Capital Management, Ltd.)
Address:  4200 Montrose Boulevard, Suite 200
Houston, Texas 77006


Form 13F File Number:    28-10022

The institutional investment manager filing this report and the person by whom
it is signed hereby represent that the person signing the report is authorized
to submit it, that all information contained herein is true, correct and
complete, and that it is understood that all required items, statements,
schedules, lists and tables, are considered integral parts of this form.

Person Signing this Report on Behalf of Reporting Manager:

Name:		Mark F. Hansen
Title:  	Chief Financial Officer
Phone:		(713) 333-5445

Signature, Place, and Date of Signing:


	/s/ Mark F. Hansen	Houston, TX				8/15/2011
	[Signature]		[City, State]				[Date]


Report type (Check only one.):

[X]	13F HOLDINGS REPORT.

[  ]	13F NOTICE.

[  ]	13F COMBINATION REPORT.

List of Other Managers Reporting for this Manager: NONE


Form 13F SUMMARY PAGE

Report Summary:


Number of Other Included Managers:  		0

List of 13(f) Securities used for this report: 	Second quarter 2011

Form 13F Information Table Entry Total:		164

Form 13F Information Table Value Total:		$332,049
					 	(thousands)

List of Other Included Managers: 		NONE






							FORM 13F INFORMATION TABLE



Column 			Column 			Column 		Column 			Column 			Column	Column	Column
1			2			3		4			5			6	7	8
-------------------	---------------		---------	-------		----------------------------	------	------	--------------
NAME			TITLE							SHS
OF			OF					VALUE		OR PRN		SH/	PUT/	INVST	OTR	VTNG AUTHRTY
ISSUER			CLS			CUSIP		x$1000		AMT		PRN	CALL	DSCRTN	MGRS	SOLE SHRD NONE
-------------------	---------------		---------	-------		------		----	----	------	------	---- ---- ----
																     

AK STL HLDG CORP	COM			001547108	$342		21,720		SH		SOLE	NONE	21,720
AKAMAI TECHNOLOGIES INC	COM			00971T101	$223		7,100		SH	PUT	SOLE	NONE	7,100
AKAMAI TECHNOLOGIES INC	COM			00971T101	$286		9,100		SH	CALL	SOLE	NONE	9,100
ALCATEL-LUCENT		SPONSORED ADR		013904305	$64		11,040		SH		SOLE	NONE	11,040
AMAZON COM INC		COM			023135106	$7,525		36,800		SH	CALL	SOLE	NONE	36,800
AMAZON COM INC		COM			023135106	$3,824		18,700		SH	PUT	SOLE	NONE	18,700
AMERICAN EXPRESS CO	COM			025816109	$331		6,400		SH	CALL	SOLE	NONE	6,400
AMERICAN INTL GROUP INC	COM NEW			026874784	$314		10,700		SH	CALL	SOLE	NONE	10,700
ANADARKO PETE CORP	COM			032511107	$775		10,100		SH	CALL	SOLE	NONE	10,100
ANADARKO PETE CORP	COM			032511107	$453		5,900		SH	PUT	SOLE	NONE	5,900
APOLLO GROUP INC	CL A			037604105	$214		4,900		SH	PUT	SOLE	NONE	4,900
APOLLO GROUP INC	CL A			037604105	$227		5,200		SH	CALL	SOLE	NONE	5,200
APPLE INC		COM			037833100	$462		1,375		SH		SOLE	NONE	1,375
APPLE INC		COM			037833100	$39,307		117,100		SH	CALL	SOLE	NONE	117,100
APPLE INC		COM			037833100	$30,009		89,400		SH	PUT	SOLE	NONE	89,400
BAIDU INC		SPON ADR REP A		056752108	$668		4,764		SH		SOLE	NONE	4,764
BAIDU INC		SPON ADR REP A		056752108	$8,926		63,700		SH	PUT	SOLE	NONE	63,700
BAIDU INC		SPON ADR REP A		056752108	$4,877		34,800		SH	CALL	SOLE	NONE	34,800
BAKER HUGHES INC	COM			057224107	$370		5,100		SH	CALL	SOLE	NONE	5,100
BARRICK GOLD CORP	COM			067901108	$516		11,400		SH	CALL	SOLE	NONE	11,400
BARRICK GOLD CORP	COM			067901108	$439		9,700		SH	PUT	SOLE	NONE	9,700
BERKSHIRE BANCORP DEL	COM NEW			084597202	$633		8,177		SH		SOLE	NONE	8,177
BEST BUY INC		COM			086516101	$311		9,900		SH	CALL	SOLE	NONE	9,900
BEST BUY INC		COM			086516101	$327		10,400		SH	PUT	SOLE	NONE	10,400
BIOCRYST PHARMACETICLS	COM			09058V103	$68		17,698		SH		SOLE	NONE	17,698
BIOTECH HOLDRS TR	DEPOSTRY RCPTS		09067D201	$268		2,500		SH		SOLE	NONE	2,500
BOEING CO		COM			097023105	$296		4,000		SH	CALL	SOLE	NONE	4,000
BROADCOM CORP		CL A			111320107	$458		13,600		SH	PUT	SOLE	NONE	13,600
BROADCOM CORP		CL A			111320107	$363		10,800		SH	CALL	SOLE	NONE	10,800
BUCKLE INC		COM			118440106	$350		8,200		SH		SOLE	NONE	8,200
CATERPILLAR INC DEL	COM			149123101	$2,566		24,100		SH	CALL	SOLE	NONE	24,100
CATERPILLAR INC DEL	COM			149123101	$1,065		10,000		SH	PUT	SOLE	NONE	10,000
CLIFFS NATURAL RESOURCS	COM			18683K101	$1,256		13,587		SH		SOLE	NONE	13,587
CLIFFS NATURAL RESOURCS COM			18683K101	$490		5,300		SH	PUT	SOLE	NONE	5,300
CLIFFS NATURAL RESOURCS COM			18683K101	$2,080		22,500		SH	CALL	SOLE	NONE	22,500
CONSOL ENERGY INC	COM			20854P109	$427		8,800		SH	PUT	SOLE	NONE	8,800
CONSOL ENERGY INC	COM			20854P109	$465		9,600		SH	CALL	SOLE	NONE	9,600
DEERE & CO		COM			244199105	$709		8,600		SH	CALL	SOLE	NONE	8,600
DIREXION SHS ETF TR	DLY FIN BULL NEW	25459W516	$262		10,200		SH	PUT	SOLE	NONE	10,200
DIREXION SHS ETF TR	DLY FIN BULL NEW	25459W516	$344		13,400		SH	CALL	SOLE	NONE	13,400
DUKE ENERGY CORP NEW	COM			26441C105	$206		10,919		SH		SOLE	NONE	10,919
EBAY INC		COM			278642103	$439		13,600		SH	CALL	SOLE	NONE	13,600
EXXON MOBIL CORP	COM			30231G102	$342		4,200		SH	PUT	SOLE	NONE	4,200
EXXON MOBIL CORP	COM			30231G102	$659		8,100		SH	CALL	SOLE	NONE	8,100
F5 NETWORKS INC		COM			315616102	$1,378		12,500		SH	CALL	SOLE	NONE	12,500
F5 NETWORKS INC		COM			315616102	$1,136		10,300		SH	PUT	SOLE	NONE	10,300
FEDEX CORP		COM			31428X106	$977		10,300		SH	CALL	SOLE	NONE	10,300
FEDEX CORP		COM			31428X106	$958		10,100		SH	PUT	SOLE	NONE	10,100
FIFTH THIRD BANCORP	COM			316773100	$149		11,688		SH		SOLE	NONE	11,688
FIRST SOLAR INC		COM			336433107	$6,878		52,000		SH	PUT	SOLE	NONE	52,000
FIRST SOLAR INC		COM			336433107	$4,682		35,400		SH	CALL	SOLE	NONE	35,400
GOLDCORP INC NEW	COM			380956409	$391		8,100		SH	PUT	SOLE	NONE	8,100
GOLDCORP INC NEW	COM			380956409	$367		7,600		SH	CALL	SOLE	NONE	7,600
GOLDMAN SACHS GROUP INC	COM			38141G104	$265		1,989		SH		SOLE	NONE	1,989
GOLDMAN SACHS GROUP INC	COM			38141G104	$6,521		49,000		SH	CALL	SOLE	NONE	49,000
GOLDMAN SACHS GROUP INC	COM			38141G104	$3,487		26,200		SH	PUT	SOLE	NONE	26,200
GOOGLE INC		CL A			38259P508	$622		1,228		SH		SOLE	NONE	1,228
GOOGLE INC		CL A			38259P508	$18,534		36,600		SH	PUT	SOLE	NONE	36,600
GOOGLE INC		CL A			38259P508	$16,609		32,800		SH	CALL	SOLE	NONE	32,800
HALLIBURTON CO		COM			406216101	$811		15,900		SH	CALL	SOLE	NONE	15,900
HALLIBURTON CO		COM			406216101	$892		17,500		SH	PUT	SOLE	NONE	17,500
HEWLETT PACKARD CO	COM			428236103	$251		6,900		SH	CALL	SOLE	NONE	6,900
INTL BUSINESS MACHS	COM			459200101	$1,252		7,300		SH	CALL	SOLE	NONE	7,300
ISHARES INC		MSCI TURKEY FD		464286715	$390		6,544		SH		SOLE	NONE	6,544
ISHARES SILVER TRUST	ISHARES			46428Q109	$264		7,800		SH	CALL	SOLE	NONE	7,800
ISHARES TR		MSCI ACJPN IDX		464288182	$408		6,578		SH		SOLE	NONE	6,578
ISHARES TR		MSCI BRAZIL		464286400	$550		7,500		SH	PUT	SOLE	NONE	7,500
ISHARES TR		MSCI BRAZIL		464286400	$1,533		20,900		SH	CALL	SOLE	NONE	20,900
ISHARES TR		RUSSELL 2000		464287655	$1,183		14,283		SH		SOLE	NONE	14,283
ISHARES TR		RUSSELL 2000		464287655	$4,256		51,400		SH	CALL	SOLE	NONE	51,400
ISHARES TR		RUSSELL 2000		464287655	$4,860		58,700		SH	PUT	SOLE	NONE	58,700
ISHARES TR		BARCLYS 20+ YR		464287432	$245		2,601		SH		SOLE	NONE	2,601
ISHARES TR		BARCLYS 20+ YR		464287432	$1,477		15,700		SH	CALL	SOLE	NONE	15,700
ISHARES TR		BARCLYS 20+ YR		464287432	$979		10,400		SH	PUT	SOLE	NONE	10,400
LAS VEGAS SANDS CORP	COM			517834107	$899		21,300		SH	PUT	SOLE	NONE	21,300
LAS VEGAS SANDS CORP	COM			517834107	$1,009		23,900		SH	CALL	SOLE	NONE	23,900
LINN ENERGY LLC		UNIT LTD LIAB		536020100	$253		6,488		SH		SOLE	NONE	6,488
LLOYDS BANKING GRP PLC	SPONSORED ADR		539439109	$57		18,163		SH		SOLE	NONE	18,163
LORILLARD INC		COM			544147101	$365		3,351		SH		SOLE	NONE	3,351
MARKET VECTORS ETF TR	BRAZL SMCP ETF		57060U613	$221		3,898		SH		SOLE	NONE	3,898
MASTERCARD INC		CL A			57636Q104	$542		1,800		SH		SOLE	NONE	1,800
MASTERCARD INC		CL A			57636Q104	$2,381		7,900		SH	PUT	SOLE	NONE	7,900
MASTERCARD INC		CL A			57636Q104	$2,923		9,700		SH	CALL	SOLE	NONE	9,700
MONSANTO CO NEW		COM			61166W101	$1,531		21,100		SH	CALL	SOLE	NONE	21,100
MONSANTO CO NEW		COM			61166W101	$1,030		14,200		SH	PUT	SOLE	NONE	14,200
MOSAIC CO NEW		COM			61945C103	$251		3,712		SH		SOLE	NONE	3,712
MOSAIC CO NEW		COM			61945C103	$1,348		19,900		SH	PUT	SOLE	NONE	19,900
MOSAIC CO NEW		COM			61945C103	$2,262		33,400		SH	CALL	SOLE	NONE	33,400
NATIONAL OILWELL VARCO	COM			637071101	$493		6,300		SH	PUT	SOLE	NONE	6,300
NATIONAL OILWELL VARCO	COM			637071101	$743		9,500		SH	CALL	SOLE	NONE	9,500
NETAPP INC		COM			64110D104	$470		8,900		SH	CALL	SOLE	NONE	8,900
NETFLIX INC		COM			64110L106	$2,812		10,706		SH		SOLE	NONE	10,706
NETFLIX INC		COM			64110L106	$13,607		51,800		SH	CALL	SOLE	NONE	51,800
NETFLIX INC		COM			64110L106	$13,476		51,300		SH	PUT	SOLE	NONE	51,300
NEWMONT MINING CORP	COM			651639106	$340		6,300		SH	PUT	SOLE	NONE	6,300
NEWMONT MINING CORP	COM			651639106	$275		5,100		SH	CALL	SOLE	NONE	5,100
NORTHEAST UTILS		COM			664397106	$237		6,746		SH		SOLE	NONE	6,746
OIL SVC HOLDRS TR	DEPOSTRY RCPT		678002106	$228		1,500		SH		SOLE	NONE	1,500
OIL SVC HOLDRS TR	DEPOSTRY RCPT		678002106	$5,791		38,100		SH	CALL	SOLE	NONE	38,100
OIL SVC HOLDRS TR	DEPOSTRY RCPT		678002106	$5,578		36,700		SH	PUT	SOLE	NONE	36,700
PEABODY ENERGY CORP	COM			704549104	$1,096		18,600		SH	CALL	SOLE	NONE	18,600
PEABODY ENERGY CORP	COM			704549104	$247		4,200		SH	PUT	SOLE	NONE	4,200
POSCO			SPONSORED ADR		693483109	$280		2,576		SH		SOLE	NONE	2,576
POTASH CORP SASK INC	COM			73755L107	$222		3,900		SH		SOLE	NONE	3,900
POTASH CORP SASK INC	COM			73755L107	$735		12,900		SH	CALL	SOLE	NONE	12,900
POTASH CORP SASK INC	COM			73755L107	$456		8,000		SH	PUT	SOLE	NONE	8,000
POWERSHARES QQQ TRUST	UNIT SER 1		73935A104	$343		6,008		SH		SOLE	NONE	6,008
POWERSHARES QQQ TRUST	UNIT SER 1		73935A104	$810		14,200		SH	CALL	SOLE	NONE	14,200
POWERSHARES QQQ TRUST	UNIT SER 1		73935A104	$884		15,500		SH	PUT	SOLE	NONE	15,500
PRICELINE COM INC	COM NEW			741503403	$2,406		4,700		SH	PUT	SOLE	NONE	4,700
PRICELINE COM INC	COM NEW			741503403	$2,867		5,600		SH	CALL	SOLE	NONE	5,600
PROSHARES TR		PSHS ULTRA DOW30	74347R305	$429		6,801		SH		SOLE	NONE	6,801
PROSHARES TR		PSHS ULTSH 20YRS	74347R297	$587		17,000		SH	CALL	SOLE	NONE	17,000
PROSHARES TR		ULTRA FNCLS NEW		74347X633	$342		5,400		SH	CALL	SOLE	NONE	5,400
PROSHARES TR		ULTRA FNCLS NEW		74347X633	$234		3,700		SH	PUT	SOLE	NONE	3,700
QUALCOMM INC		COM			747525103	$295		5,200		SH	CALL	SOLE	NONE	5,200
QUALCOMM INC		COM			747525103	$403		7,100		SH	PUT	SOLE	NONE	7,100
RESEARCH IN MOTION LTD	COM			760975102	$805		27,900		SH	PUT	SOLE	NONE	27,900
RESEARCH IN MOTION LTD	COM			760975102	$531		18,400		SH	CALL	SOLE	NONE	18,400
RYDEX ETF TRUST		S&P 500 EQ TRD		78355W106	$668		13,192		SH		SOLE	NONE	13,192
SALESFORCE COM INC	COM			79466L302	$3,739		25,100		SH	PUT	SOLE	NONE	25,100
SALESFORCE COM INC	COM			79466L302	$4,693		31,500		SH	CALL	SOLE	NONE	31,500
SANDISK CORP		COM			80004C101	$241		5,800		SH	PUT	SOLE	NONE	5,800
SANDISK CORP		COM			80004C101	$361		8,700		SH	CALL	SOLE	NONE	8,700
SCHLUMBERGER LTD	COM			806857108	$795		9,200		SH	CALL	SOLE	NONE	9,200
SCHLUMBERGER LTD	COM			806857108	$372		4,300		SH	PUT	SOLE	NONE	4,300
SELECT SECTOR SPDR TR	SBI INT-ENERGY		81369Y506	$308		4,092		SH		SOLE	NONE	4,092
SELECT SECTOR SPDR TR	SBI INT-ENERGY		81369Y506	$384		5,100		SH	PUT	SOLE	NONE	5,100
SELECT SECTOR SPDR TR	SBI INT-ENERGY		81369Y506	$460		6,100		SH	CALL	SOLE	NONE	6,100
SELECT SECTOR SPDR TR	SBI INT-FINL		81369Y605	$2,343		152,814		SH		SOLE	NONE	152,814
SELECT SECTOR SPDR TR	SBI INT-INDS		81369Y704	$1,442		38,715		SH		SOLE	NONE	38,715
SELECT SECTOR SPDR TR	SBI INT-TECH		81369Y803	$853		33,204		SH		SOLE	NONE	33,204
SELECT SECTOR SPDR TR	SBI INT-UTILS		81369Y886	$1,257		37,556		SH		SOLE	NONE	37,556
SELECT SECTOR SPDR TR	SBI CONS DISCR		81369Y407	$513		12,769		SH		SOLE	NONE	12,769
SEQUANS COMMNICTINS S A	SPONSORED ADS		817323108	$429		30,087		SH		SOLE	NONE	30,087
SILVER WHEATON CORP	COM			828336107	$386		11,700		SH	PUT	SOLE	NONE	11,700
SILVER WHEATON CORP	COM			828336107	$660		20,000		SH	CALL	SOLE	NONE	20,000
SPDR DOW JONES IDL AVRG UT SER 1		78467X109	$1,957		15,800		SH	CALL	SOLE	NONE	15,800
SPDR DOW JONES IDL AVRG UT SER 1		78467X109	$1,721		13,900		SH	PUT	SOLE	NONE	13,900
SPDR GOLD TRUST		GOLD SHS		78463V107	$496		3,400		SH		SOLE	NONE	3,400
SPDR GOLD TRUST		GOLD SHS		78463V107	$10,702		73,300		SH	CALL	SOLE	NONE	73,300
SPDR GOLD TRUST		GOLD SHS		78463V107	$8,760		60,000		SH	PUT	SOLE	NONE	60,000
SPDR INDEX SHS FDS	S&P EMKTSC ETF		78463X756	$352		6,476		SH		SOLE	NONE	6,476
SPDR SERIES TRUST	SPDR KBW INS ETF	78464A789	$220		5,273		SH		SOLE	NONE	5,273
SPDR SERIES TRUST	S&P DIVID ETF		78464A763	$762		14,099		SH		SOLE	NONE	14,099
STONE ENERGY CORP	COM			861642106	$507		16,683		SH		SOLE	NONE	16,683
SYNOVUS FINL CORP	COM			87161C105	$52		24,808		SH		SOLE	NONE	24,808
TEMPUR PEDIC INTL INC	COM			88023U101	$912		13,444		SH		SOLE	NONE	13,444
THERMO FISHER SCIENIFIC	COM			883556102	$562		8,724		SH		SOLE	NONE	8,724
TRANSOCEAN LTD		REG SHS			H8817H100	$1,717		26,600		SH	CALL	SOLE	NONE	26,600
TRANSOCEAN LTD		REG SHS			H8817H100	$697		10,800		SH	PUT	SOLE	NONE	10,800
TRAVELZOO INC		COM			89421Q106	$421		6,516		SH		SOLE	NONE	6,516
UNITED STATES STL CORP	COM			912909108	$1,238		26,900		SH	CALL	SOLE	NONE	26,900
UNITED STATES STL CORP	COM			912909108	$562		12,200		SH	PUT	SOLE	NONE	12,200
UNITEDHEALTH GROUP INC	COM			91324P102	$211		4,100		SH	PUT	SOLE	NONE	4,100
VALE S A		ADR			91912E105	$229		7,919		SH		SOLE	NONE	7,919
VANGUARD INTL EQITY IDX	ALLWRLD EX US		922042775	$452		9,075		SH		SOLE	NONE	9,075
VIACOM INC NEW		CL B			92553P201	$589		11,540		SH		SOLE	NONE	11,540
VISA INC		COM CL A		92826C839	$2,224		26,400		SH	PUT	SOLE	NONE	26,400
VISA INC		COM CL A		92826C839	$2,165		25,700		SH	CALL	SOLE	NONE	25,700
WHIRLPOOL CORP		COM			963320106	$325		4,000		SH	CALL	SOLE	NONE	4,000
WYNN RESORTS LTD	COM			983134107	$616		4,293		SH		SOLE	NONE	4,293
WYNN RESORTS LTD	COM			983134107	$2,311		16,100		SH	CALL	SOLE	NONE	16,100
WYNN RESORTS LTD	COM			983134107	$1,450		10,100		SH	PUT	SOLE	NONE	10,100