Filed Pursuant to Rule 424(b)(3)
Registration No. 333-155800

July 2011 Performance Update

The Frontier Fund Supplement Dated July 31, 2011 to Prospectus Dated April 30, 2011.

The Frontier Fund Class 2 Original

T H E    F RO N T I E R    F U N D’ S    G O A L : To provide you – the investor – with a managed futures product that, over the long term, provides attractive returns, reduces volatility, and improves the overall performance of your investment portfolio.

July performance for the various Series of The Frontier Fund is detailed below:*

The Frontier Fund Class 2 Original	July 31, 2011	July 31, 2011	NAV /Unit
	MTD	YTD
Balanced Series-2	-1.17%	-0.82%		$158.15
Balanced Series-2a	-1.27%	-1.50%		$131.65
Berkeley/Graham/Tiverton Series-2	0.75%	-6.67%		$122.94
Currency Series-2	-1.03%	-5.07%		$90.59
Long/Short Commodity Series-2	5.60%	13.47%		$173.91
Winton/Graham Series-2	4.77%	1.03%		$145.52
Winton Series-2	5.85%	5.12%		$161.87
Long Only Commodity Series-2	1.74%	2.49%		$106.30
Managed Futures Index Series-2	2.25%	-9.00%		$118.02

Additional information, including monthly rates of return, concerning the aforementioned Series and the Trading Advisor(s) is contained in the Prospectus and the respective Series Appendix to the Prospectus.

* The above table sets forth the actual performance for the Class and Series as of July 31, 2011. Actual gross trading performance (gross realized and unrealized gain/loss before deduction for trading commissions and fees, management fees, any other expense, and before addition of interest income) is adjusted for the trading expenses, management fees, initial service fees, on-going service fees, and interest income of the applicable Series.

THIS INSERT MUST BE ACCOMPANIED OR PRECEDED BY THE CURRENT PROSPECTUS OF THE FRONTIER FUND

PAST PERFORMANCE IS NOT INDICATIVE OF FUTURE RESULTS

THE FRONTIER FUND BALANCED SERIES - 2

STATEMENT OF INCOME (LOSS)

FOR THE MONTH ENDED

July 31, 2011

(Unaudited)

							Current Period
INCOME
Realized trading gain/(loss)							$	(1,196,843.28	)
Unrealized trading gain/(loss)								657,055.91
Less: commissions								(76,884.56	)
Less: FCM fees								(23,412.79	)
Foreign currency gain/(loss)								16,316.09
Interest income								14,173.91
Total Income								(609,594.72	)
EXPENSES
Management fees								40,372.02
Incentive fees								138,782.19
Total Expenses								179,154.21
Net Income (Loss)							$	(788,748.93	)
STATEMENT OF CHANGES IN NET ASSET VALUE
	Units			Dollars			$’s per unit
Net Asset Value, end of prior month		422,273.54518		$	67,571,265.59			160.02
Current month additions		26.92002			4,261.68
Current month redemptions		(1,044.62765	)		(165,300.52	)
Net Income (loss) for current month					(788,748.93	)
Net Asset Value, end of current month		421,255.83755		$	66,621,477.82			158.15
		Monthly rate of return						-1.17	%

To the best of my knowledge and belief, the information

contained in this statement is accurate and complete

/s/    S. Brent Bales

S. Brent Bales, Chief Accounting Officer of the Managing Owner

Equinox Fund Management LLC

1775 Sherman Street, Suite 2500

Denver, Colorado 80203

On Behalf of the Frontier Fund - Balanced Series 2

THE FRONTIER FUND BALANCED SERIES - 2a

STATEMENT OF INCOME (LOSS)

FOR THE MONTH ENDED

July 31, 2011

(Unaudited)

							Current Period
INCOME
Realized trading gain/(loss)							$	(57,385.03	)
Unrealized trading gain/(loss)								31,404.01
Less: commissions								(3,701.23	)
Less: FCM fees								(1,126.85	)
Foreign currency gain/(loss)								771.87
Interest income								4,139.58
Total Income								(25,897.65	)
EXPENSES
Trading Fee								6,937.23
Management fees								1,947.07
Incentive fees								6,660.51
Total Expenses								15,544.81
Net Income (Loss)							$	(41,442.46	)
STATEMENT OF CHANGES IN NET ASSET VALUE
	Units			Dollars			$’s per unit
Net Asset Value, end of prior month		24,520.09355		$	3,269,787.25			133.35
Current month additions		—			—
Current month redemptions		(225.87765	)		(29,962.82	)
Net Income (loss) for current month					(41,442.46	)
Net Asset Value, end of current month		24,294.21590		$	3,198,381.97			131.65
		Monthly rate of return						-1.27	%

To the best of my knowledge and belief, the information

contained in this statement is accurate and complete

/s/    S. Brent Bales

S. Brent Bales, Chief Accounting Officer of the Managing Owner

Equinox Fund Management LLC

1775 Sherman Street, Suite 2500

Denver, Colorado 80203

On Behalf of the Frontier Fund - Balanced Series 2a

THE FRONTIER FUND BERKELEY/GRAHAM/TIVERTON SERIES - 2

STATEMENT OF INCOME (LOSS)

FOR THE MONTH ENDED

July 31, 2011

(Unaudited)

							Current Period
INCOME
Realized trading gain/(loss)							$	(74,554.34	)
Unrealized trading gain/(loss)								134,297.44
Less: commissions								(4,612.58	)
Less: FCM fees								(2,054.01	)
Foreign currency gain/(loss)								(441.24	)
Interest income								2,313.17
Total Income								54,948.44
EXPENSES
Management fees								15,865.37
Incentive fees								—
Total Expenses								15,865.37
Net Income (Loss)							$	39,083.07
STATEMENT OF CHANGES IN NET ASSET VALUE
	Units			Dollars			$’s per unit
Net Asset Value, end of prior month		42,729.95534		$	5,214,054.79			122.02
Current month additions		—			—
Current month redemptions		(356.81837	)		(43,718.91	)
Net Income (loss) for current month					39,083.07
Net Asset Value, end of current month		42,373.13697		$	5,209,418.95			122.94
		Monthly rate of return						0.75	%

To the best of my knowledge and belief, the information

contained in this statement is accurate and complete

/s/    S. Brent Bales

S. Brent Bales, Chief Accounting Officer of the Managing Owner

Equinox Fund Management LLC

1775 Sherman Street, Suite 2500

Denver, Colorado 80203

On Behalf of the Frontier Fund - Berkeley/Graham/Tiverton Series 2

THE FRONTIER FUND CURRENCY SERIES - 2

STATEMENT OF INCOME (LOSS)

FOR THE MONTH ENDED

July 31, 2011

(Unaudited)

							Current Period
INCOME
Realized trading gain/(loss)							$	9,733.12
Unrealized trading gain/(loss)								(67,384.56	)
Net change in inter-series payables								58,176.69
Less: FCM fees								(1,597.85	)
Interest income								869.93
Total Income								(202.67	)
EXPENSES
Management fees								1,057.12
Incentive fees								—
Total Expenses								1,057.12
Net Income (Loss)							$	(1,259.79	)
STATEMENT OF CHANGES IN NET ASSET VALUE
	Units			Dollars			$’s per unit
Net Asset Value, end of prior month		1,338.56941		$	122,526.38			91.54
Current month additions		—			—
Current month redemptions		(18.38863	)		(1,670.62	)
Net Income (loss) for current month					(1,259.79	)
Net Asset Value, end of current month		1,320.18078		$	119,595.97			90.59
		Monthly rate of return						-1.03	%

To the best of my knowledge and belief, the information

contained in this statement is accurate and complete

/s/    S. Brent Bales

S. Brent Bales, Chief Accounting Officer of the Managing Owner

Equinox Fund Management LLC

1775 Sherman Street, Suite 2500

Denver, Colorado 80203

On Behalf of the Frontier Fund - Currency Series 2

THE FRONTIER FUND LONG/SHORT COMMODITY SERIES - 2

STATEMENT OF INCOME (LOSS)

FOR THE MONTH ENDED

July 31, 2011

(Unaudited)

							Current Period
INCOME
Realized trading gain/(loss)							$	198,838.31
Unrealized trading gain/(loss)								556,932.70
Less: commissions								(4,865.83	)
Less: FCM fees								(4,448.68	)
Foreign currency gain/(loss)								156.34
Interest income								19,718.06
Total Income								766,330.90
EXPENSES
Management fees								53,014.24
Incentive fees								98,735.01
Total Expenses								151,749.25
Net Income (Loss)							$	614,581.65
STATEMENT OF CHANGES IN NET ASSET VALUE
	Units			Dollars			$’s per unit
Net Asset Value, end of prior month		67,162.97528		$	11,061,057.30			164.69
Current month additions		—			—
Current month redemptions		(699.71443	)		(116,875.32	)
Net Income (loss) for current month					614,581.65
Net Asset Value, end of current month		66,463.26085		$	11,558,763.63			173.91
		Monthly rate of return						5.60	%

To the best of my knowledge and belief, the information

contained in this statement is accurate and complete

/s/    S. Brent Bales

S. Brent Bales, Chief Accounting Officer of the Managing Owner

Equinox Fund Management LLC

1775 Sherman Street, Suite 2500

Denver, Colorado 80203

On Behalf of the Frontier Fund - Long/Short Commodity Series 2

THE FRONTIER FUND WINTON/GRAHAM SERIES - 2

STATEMENT OF INCOME (LOSS)

FOR THE MONTH ENDED

July 31, 2011

(Unaudited)

							Current Period
INCOME
Realized trading gain/(loss)							$	(7,910.91	)
Unrealized trading gain/(loss)								387,725.23
Less: commissions								(5,808.61	)
Less: FCM fees								(2,785.79	)
Foreign currency gain/(loss)								34.71
Interest income								3,831.09
Total Income								375,085.72
EXPENSES
Management fees								17,310.19
Incentive fees								27,541.06
Total Expenses								44,851.25
Net Income (Loss)							$	330,234.47
STATEMENT OF CHANGES IN NET ASSET VALUE
	Units			Dollars			$’s per unit
Net Asset Value, end of prior month		49,929.68329		$	6,934,998.14			138.90
Current month additions		—			—
Current month redemptions		(325.34909	)		(46,680.13	)
Net Income (loss) for current month					330,234.47
Net Asset Value, end of current month		49,604.33420		$	7,218,552.48			145.52
		Monthly rate of return						4.77	%

To the best of my knowledge and belief, the information

contained in this statement is accurate and complete

/s/    S. Brent Bales

S. Brent Bales, Chief Accounting Officer of the Managing Owner

Equinox Fund Management LLC

1775 Sherman Street, Suite 2500

Denver, Colorado 80203

On Behalf of the Frontier Fund - Winton/Graham Series 2

THE FRONTIER FUND WINTON SERIES - 2

STATEMENT OF INCOME (LOSS)

FOR THE MONTH ENDED

July 31, 2011

(Unaudited)

					Current Period
INCOME
Realized trading gain/(loss)					$	(11,245.58	)
Unrealized trading gain/(loss)						735,069.87
Less: commissions						(624.35	)
Less: FCM fees						(4,377.44	)
Foreign currency gain/(loss)						(154.03	)
Interest income						7,887.95
Total Income						726,556.42
EXPENSES
Management fees						21,645.80
Incentive fees						69,651.49
Total Expenses						91,297.29
Net Income (Loss)					$	635,259.13
STATEMENT OF CHANGES IN NET ASSET VALUE
	Units		Dollars		$’s per unit
Net Asset Value, end of prior month		70,984.32176	$	10,855,179.07		152.92
Current month additions		—		—
Current month redemptions		—		—
Net Income (loss) for current month				635,259.13
Net Asset Value, end of current month		70,984.32176	$	11,490,438.20		161.87
		Monthly rate of return				5.85	%

To the best of my knowledge and belief, the information

contained in this statement is accurate and complete

/s/    S. Brent Bales

S. Brent Bales, Chief Accounting Officer of the Managing Owner

Equinox Fund Management LLC

1775 Sherman Street, Suite 2500

Denver, Colorado 80203

On Behalf of the Frontier Fund - Winton Series 2

THE FRONTIER FUND LONG ONLY COMMODITY SERIES - 2

STATEMENT OF INCOME (LOSS)

FOR THE MONTH ENDED

July 31, 2011

(Unaudited)

					Current Period
INCOME
Realized trading gain/(loss)					$	4,612.25
Unrealized trading gain/(loss)						353.34
Less: commissions						—
Less: FCM fees						(117.09	)
Foreign currency gain/(loss)						—
Interest income						545.64
Total Income						5,394.14
EXPENSES
Management fees						315.72
Incentive fees						—
Total Expenses						315.72
Net Income (Loss)					$	5,078.42
STATEMENT OF CHANGES IN NET ASSET VALUE
	Units		Dollars		$’s per unit
Net Asset Value, end of prior month		2,794.93534	$	292,009.66		104.48
Current month additions		—		—
Current month redemptions		—		—
Net Income (loss) for current month				5,078.42
Net Asset Value, end of current month		2,794.93534	$	297,088.08		106.30
		Monthly rate of return				1.74	%

To the best of my knowledge and belief, the information

contained in this statement is accurate and complete

/s/    S. Brent Bales

S. Brent Bales, Chief Accounting Officer of the Managing Owner

Equinox Fund Management LLC

1775 Sherman Street, Suite 2500

Denver, Colorado 80203

On Behalf of the Frontier Fund - Long Only Commodity Series 2

THE FRONTIER FUND MANAGED FUTURES INDEX SERIES - 2

STATEMENT OF INCOME (LOSS)

FOR THE MONTH ENDED

July 31, 2011

(Unaudited)

					Current Period
INCOME
Realized trading gain/(loss)					$	(94,995.87	)
Unrealized trading gain/(loss)						160,990.14
Less: commissions						(626.63	)
Less: FCM fees						(1,111.99	)
Foreign currency gain/(loss)						402.09
Interest income						4,748.21
Total Income						69,405.95
EXPENSES
Management fees						5,996.02
Incentive fees
Total Expenses						5,996.02
Net Income (Loss)					$	63,409.93
STATEMENT OF CHANGES IN NET ASSET VALUE
	Units		Dollars		$’s per unit
Net Asset Value, end of prior month		24,437.89489	$	2,820,775.79		115.43
Current month additions		—		—
Current month redemptions		—		—
Net Income (loss) for current month				63,409.93
Net Asset Value, end of current month		24,437.89489	$	2,884,185.72		118.02
		Monthly rate of return				2.25	%

To the best of my knowledge and belief, the information

contained in this statement is accurate and complete

/s/    S. Brent Bales

S. Brent Bales, Chief Accounting Officer of the Managing Owner

Equinox Fund Management LLC

1775 Sherman Street, Suite 2500

Denver, Colorado 80203

On Behalf of the Frontier Fund - Managed Futures Index Series 2