10-Q/A

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q/A

(Amendment No.1)

(Mark One)
x	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the quarterly period ended June 30, 2011.
o	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the transition  period from           to

Commission File Number: 001-33440

INTERACTIVE BROKERS GROUP, INC.

(Exact name of registrant as specified in its charter)

Delaware	30-0390693
(State or other jurisdiction	(I.R.S. Employer
of incorporation or organization)	Identification No.)

One Pickwick Plaza

Greenwich, Connecticut 06830

(Address of principal executive office)

(203) 618-5800

(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x No  o.

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  x    No   ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, or a non-accelerated filer. See definition of “accelerated filer” and large accelerated filer” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer x	Accelerated filer o	Non-accelerated filer o	Smaller reporting company o
		(Do not check if a smaller
		reporting company)

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).   Yes  o    No  x.

As of August  9, 2011, there were 45,565,484 shares of the issuer’s Class A common stock, par value $0.01 per share, outstanding and 100 shares of the issuer’s Class B common stock, par value $0.01 per share, outstanding.

EXPLANATORY NOTE

    The purpose of this Amendment No. 1 to the Interactive Brokers Group Inc. (the "Company") Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2011 filed with the Securities and Exchange Commission on August 9, 2011, is to furnish Exhibit 101 to the Form 10-Q, as required by Rule 405 of Regulation S-T.  Exhibit 101 contains the unaudited condensed financial statements and related footnotes from our Form 10-Q formatted in Extensible Business Reporting Language ("XBRL").   

     No other changes have been made to the Form 10-Q.  This Form 10-Q/A Amendment No. 1 does not reflect subsequent events occurring after the original filing date of the Form 10-Q or modify or update and disclosure made in the Form 10-Q.

    Users of this data are advised that pursuant to Rule 406T these interactive data files are deemed not filed or part of a registration statement or prospectus for purposes of Sections 11 or 12 of the Securities Act of 1933, as amended, are deemed not filed for purposes of Section 18 of the Securities and Exchange act of 1934, and otherwise are not subject to liability under those sections.

2

PART II

ITEM 6.  EXHIBITS

Exhibit
Number	Description
10.1	Amended and Restated Operating Agreement of IBG LLC (filed as Exhibit 10.1 to the Quarterly Report on Form 10-Q for the Quarterly Period Ended March 31, 2007 filed by the Company on June 15, 2007).**
10.2	Form of Limited Liability Company Operating Agreement of IBG Holdings LLC (filed as Exhibit 10.5 to Amendment No. 1 to the Registration Statement on Form S-1 filed by the Company on February 12, 2007).**
10.3	Exchange Agreement by and among Interactive Brokers Group, Inc., IBG Holdings LLC, IBG LLC and the Members of IBG LLC (filed as Exhibit 10.3 to the Quarterly Report on Form 10-Q for the Quarterly Period Ended September 30, 2009 filed by the Company on November 11, 2009).**
10.4	Tax Receivable Agreement by and between Interactive Brokers Group, Inc. and IBG Holdings LLC (filed as Exhibit 10.3 to the Quarterly Report on Form 10-Q for the Quarterly Period Ended March 31, 2007 filed by the Company on June 15, 2007).**
10.5	Interactive Brokers Group, Inc. 2007 Stock Incentive Plan (filed as Exhibit 10.8 to Amendment No. 2 to the Registration Statement on Form S-1 filed by the Company on April 4, 2007).**+
10.6	Interactive Brokers Group, Inc. 2007 ROI Unit Stock Plan. (filed as Exhibit 10.9 to Amendment No. 2 to the Registration Statement on Form S-1 filed by the Company on April 4, 2007).**+
31.1	Certification of Chief Executive Officer, pursuant to Section 302 of the Sarbanes-Oxley Act of 2002***
31.2	Certification of Chief Financial Officer, pursuant to Section 302 of the Sarbanes-Oxley Act of 2002***
32.1	Certification of Chief Executive Officer, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002***
32.2	Certification of Chief Financial Officer, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002***
101.INS	XBRL Instance Document*
101.SCH	XBRL Extension Schema*
101.CAL	XBRL Extension Calculation Linkbase*
101.DEF	XBRL Extension Definition Linkbase*
101.LAB	XBRL Extension Label Linkbase*
101.PRE	XBRL Extension Presentation Linkbase*
________________________________________
**	Previously filed; incorporated herein by reference.
+	These exhibits relate to management contracts or compensatory plans or arrangements.
***	Filed with the Company's Quarterly Report on Form 10-Q for the Quarterly Period ended June 30, 2011 as filed by the Company on August 9, 2011
*	Attached as Exhibit 101 to this Quarterly Report on Form 10-Q for the quarterly period ended June 30, 2011,
	are the following materials formatted in XBRL (Extensible Business Reporting Language) (i) the Condensed
	Consolidated Statements of Financial Condition, (ii) the Condensed Consolidated Statements of Comprehensive Income,
	(iii) the Condensed Consolidated Statements of Cash Flows, (iv) the Condensed Consolidated Statement
	of Changes in Equity and (v) Notes to the Condensed Consolidated Financial Statements,
	tagged in detail levels 1-4.

 

3

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	INTERACTIVE BROKERS GROUP, INC.
	/s/ Paul J. Brody
	Name: Paul J. Brody
	Title: Chief Financial Officer, Treasurer and Secretary
	(Signing both in his capacity as a duly authorized officer and as principal financial officer of the registrant)
Date: September 8, 2011

4

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Subsequent Events (Detail)	1 Months Ended
	Aug. 04, 2011	Jun. 30, 2011	May 03, 2007
Subsequent Events
Common stock issued during period	1,983,624
IBG Inc. ownership % of IBG LLC	11.50%	11.00%	10.00%

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Condensed Consolidated Statements of Financial Condition (Parenthetical, Unaudited) (USD $) In Thousands, except Share data	Jun. 30, 2011	Dec. 31, 2010
Allowance for doubtful accounts	$ 20,746	$ 17,871
Accumulated Other Comprehensive Income (Loss), Tax	$ 15,251	$ 12,284
Treasury stock shares	6,716,164	8,066,473
Common Class A
Common stock, par value	$ 0.01	$ 0.01
Shares authorized	1,000,000,000	1,000,000,000
Shares issued	50,298,024	50,298,024
Common stock, shares outstanding	43,581,860	42,231,551
Common Class B
Common stock, par value	$ 0.01	$ 0.01
Shares authorized	100	100
Shares issued	100	100
Common stock, shares outstanding	100	100

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Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, except Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenues:
Trading gains	$ 120,569	$ 77,640	$ 320,907	$ 158,214
Commissions and execution fees	106,432	107,519	215,631	199,252
Interest income	79,400	40,968	138,063	77,617
Other income	14,976	17,723	32,411	34,497
Total revenues	321,377	243,850	707,012	469,580
Interest expense	24,437	17,714	42,184	32,874
Total net revenues	296,940	226,136	664,828	436,706
Non-interest expenses:
Execution and clearing	66,074	75,482	132,311	145,170
Employee compensation and benefits	52,651	49,578	105,010	100,036
Occupancy, depreciation and amortization	9,059	9,148	18,305	18,352
Communications	6,665	6,322	12,113	11,724
General and administrative	13,347	13,530	25,973	24,435
Total non-interest expenses	147,796	154,060	293,712	299,717
Income before income taxes	149,144	72,076	371,116	136,989
Income tax expense	12,496	7,308	31,228	12,534
Net income	136,648	64,768	339,888	124,455
Less net income attributable to non-controlling interests	127,087	60,928	314,076	116,724
Net income available for common stockholders	9,561	3,840	25,812	7,731
Earnings per share:
Basic	$ 0.22	$ 0.09	$ 0.61	$ 0.18
Diluted	$ 0.22	$ 0.09	$ 0.60	$ 0.18
Weighted average common shares outstanding:
Basic	43,018,095	41,802,541	42,627,045	41,511,328
Diluted	43,470,928	42,441,995	43,133,155	42,206,384
Comprehensive income:
Net income available for common stockholders	9,561	3,840	25,812	7,731
Other comprehensive income:
Cumulative Translation adjustment, before income taxes	6,067	(5,785)	8,072	(7,992)
Income taxes related to items of other comprehensive income	2,230	(2,126)	2,967	(2,937)
Other comprehensive income (loss), net of tax	3,837	(3,659)	5,105	(5,055)
Comprehensive income available for common stockholders	13,398	181	30,917	2,676
Comprehensive income attributable to non-controlling interests:
Net income attributable to non-controlling interests	127,087	60,928	314,076	116,724
Other comprehensive income (loss) - cumulative translation adjustment	50,144	(49,426)	66,761	(68,174)
Comprehensive income attributable to non-controlling interests	$ 177,231	$ 11,502	$ 380,837	$ 48,550

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Equity and Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2011

Notes to Consolidated Financial Statements

Redemption of member interests from Holdings

				Price per Equivalent
		Fair Value		Class A Share
2008	$	72,015	$	29.99
2009		14,738		14.85
2010		27,204		16.80

Earnings per Share Basic and Diluted

			Three months ended				Six months ended
			June 30,				June 30,
			2011		2010		2011		2010
Basic earnings per share:
	Net income available for common stockholders	$	9,561	$	3,840	$	25,812	$	7,731
	Weighted average shares of common stock outstanding:
Class A			43,017,995		41,802,441		42,626,945		41,511,228
Class B			100		100		100		100
			43,018,095		41,802,541		42,627,045		41,511,328
	Basic earnings per share	$	0.22	$	0.09	$	0.61	$	0.18

					Three months ended				Six months ended
					June 30,				June 30,
					2011		2010		2011		2010
Diluted earnings per share:
	Net income available for common stockholders - basic			$	9,561	$	3,840	$	25,812	$	7,731
	Adjustments for potentially dilutive common shares				-		-		-		-
	Net income available for common stockholders			$	9,561	$	3,840	$	25,812	$	7,731
	Weighted average shares of common stock outstanding:
		Class A:
			Issued and outstanding		43,017,995		41,802,441		42,626,945		41,511,228
Potentially dilutive common shares:
Issuable pursuant to 2007 ROI Unit Stock Plan					452,833		639,454		506,110		695,056
		Class B			100		100		100		100
					43,470,928		42,441,995		43,133,155		42,206,384
	Diluted earnings per share			$	0.22	$	0.09	$	0.60	$	0.18

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Documentation and Entity Information	6 Months Ended
	Jun. 30, 2011	Aug. 09, 2011 Common Class A	Aug. 09, 2011 Common Class B
Entity Registrant Name	INTERACTIVE BROKERS GROUP, INC.
Entity Central Index Key	0001381197
Document Type	10-Q
Document Period End Date	Jun. 30, 2011
Amendment Flag	false
Fiscal Year Focus	2011
Fiscal Period Focus	Q2
Current Fiscal Year End Date	--12-31
Well Known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Common Stock Shares Outstanding		45,565,484	100

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Regulatory Requirements (Detail) (USD $) In Thousands	Jun. 30, 2011
All Operating Companies
Regulatory Requirements [Abstract]
Excess regulatory capital	$ 2,810,000
TH LLC
Regulatory Requirements [Abstract]
Excess regulatory capital	961,722
Net capital	1,010,193
Required net capital	48,471
IB LLC
Regulatory Requirements [Abstract]
Excess regulatory capital	1,052,101
Net capital	1,256,667
Required net capital	204,566
THSC
Regulatory Requirements [Abstract]
Excess regulatory capital	1,596
Net capital	1,696
Required net capital	100
THE
Regulatory Requirements [Abstract]
Excess regulatory capital	406,892
Eligible Equity	660,838
Required net capital	$ 253,646

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Collateralized Transactions (Tables)

6 Months Ended

Jun. 30, 2011

Notes to Consolidated Financial Statements

Financial instruments owned and pledged where the counterparty has the right to repledge

		June 30,		December 31,
		2011		2010
Stocks	$	1,676,779	$	1,633,383
U.S. and foreign government obligations		301,379		368,105
	$	1,978,158	$	2,001,488

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Segment and Geographic Information Additional Information (Detail) (USD $) In Thousands	Jun. 30, 2011
Segment and geographic information [Abstract]
Increase in net costs Market Making	$ 1,552
Increase in net costs Electronic Brokerage	$ 2,098

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Fair Value

6 Months Ended

Jun. 30, 2011

Notes to Consolidated Financial Statements

Fair value

6.   Fair Value

The following tables set forth, by level within the fair value hierarchy (Note 2), financial assets and liabilities, primarily financial instruments owned and financial instruments sold, but not yet purchased at fair value as of June 30, 2011 and December 31, 2010.  As required by ASC 820, assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement.

			Financial Assets At Fair Value as of June 30, 2011
			Level 1		Level 2		Level 3		Total
Securities segregated for regulatory purposes		$	397,694	$	440,471	$	-	$	838,165
Financial instruments owned:
	Stocks		621,422		-		-		621,422
	Options		3,277,354		-		-		3,277,354
	U.S. and foreign government obligations		15,610		-		-		15,610
	Warrants		56,948		-		-		56,948
	Corporate and municipal bonds		51,503		51,428		-		102,931
	Discount certificates		50,366		-		-		50,366
	Currency forward contracts		-		674		-		674
			4,073,203		52,102		-		4,125,305
Financial instruments owned and pledged as collateral:
	Stocks		1,676,779		-		-		1,676,779
	U.S. and foreign government obligations		301,379		-		-		301,379
			1,978,158		-		-		1,978,158
			6,051,361		52,102		-		6,103,463
Other assets - investments in common stock			22,892		-		-		22,892
		$	6,471,947	$	492,573	$	-	$	6,964,520
			Financial Liabilities At Fair Value as of June 30, 2011
			Level 1		Level 2		Level 3		Total
Financial instruments sold, not yet purchased:
	Stocks	$	1,777,331	$	-	$	-	$	1,777,331
	Options		3,057,013		-		-		3,057,013
	U.S. and foreign government obligations		53		-		-		53
	Corporate bonds		53,681		49,573		-		103,254
	Currency forward contracts		-		2,325		-		2,325
		$	4,888,078	$	51,898	$	-	$	4,939,976

		Financial Assets At Fair Value as of December 31, 2010
			Level 1		Level 2		Level 3		Total
Securities segregated for regulatory purposes		$	146,976	$	440,773	$	-	$	587,749
Financial instruments owned:
	Stocks		1,318,003		-		-		1,318,003
	Options		3,893,695		-		-		3,893,695
	U.S. and foreign government obligations		8,408		-		-		8,408
	Warrants		85,740		-		-		85,740
	Corporate and municipal bonds		47,757		48,895		-		96,652
	Discount certificates		18,217		-		-		18,217
	Currency forward contracts		-		214		-		214
			5,371,820		49,109		-		5,420,929
Financial instruments owned and pledged as collateral:
	Stocks		1,633,383		-		-		1,633,383
	U.S. and foreign government obligations		368,105		-		-		368,105
			2,001,488		-		-		2,001,488
			7,373,308		49,109		-		7,422,417
Other assets - investments in common stock			-		2,239		-		2,239
		$	7,520,284	$	492,121	$	-	$	8,012,405
		Financial Liabilities At Fair Value as of December 31, 2010
			Level 1		Level 2		Level 3		Total
Financial instruments sold, not yet purchased:
	Stocks	$	2,256,259	$	-	$	-	$	2,256,259
	Options		3,765,862		-		-		3,765,862
	Warrants		12		-		-		12
	Corporate bonds		48,419		50,734		-		99,153
	Currency forward contracts		-		3,938		-		3,938
		$	6,070,552	$	54,672	$	-	$	6,125,224

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Defined Contribution and Employee Incentive Plans (Tables)

6 Months Ended

Jun. 30, 2011

Notes to Consolidated Financial Statements

Share grants and Fair Value

			Fair Value at
			Date of Grant
	Shares		($000's)
In connection with IPO	927,943	$	27,847
July 31, 2007	16,665		404
December 31, 2007	1,055,206		32,876
December 31, 2008	2,065,432		35,600
December 31, 2009	2,448,031		42,796
December 31, 2010	2,513,738		43,255
	9,027,015	$	182,778

Distributions under Stock Incentive Plan, ROI Plan

				Shares sold by
				employees to
			Fair Value at	meet
			Date of Grant	withholding
	Total Shares		($000's)	obligations
In connection with IPO	189,617	$	5,681	45,857
2008	458,655		13,881	121,852
2009	680,164		17,898	175,362
2010	1,014,772		23,742	265,971
2011	1,350,309		29,405	370,310

2007 Stock Incentive Plan, ROI Summary

	Shares
	2007 Stock		2007 ROI Unit
	Incentive Plan		Stock Plan
Balance, December 31, 2010	7,263,140		544,613
Granted	-		-
Forfeited	(44,257	)	(51	)
Distributed	(1,164,831	)	(185,478	)
Balance, June 30, 2011	6,054,052		359,084

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Defined Contribution and Employee Incentive Plan Total Share Distributions (Detail) (USD $) In Thousands, except Share data	6 Months Ended	8 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2007	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Total share distribution [Abstract]
Total Shares	1,350,309	189,617	1,014,772	680,164	458,655
Fair Value at Date of Grant ($000's)	$ 29,405	$ 5,681	$ 23,742	$ 17,898	$ 13,881
Shares sold by employees to meet withholding obligations	370,310	45,857	265,971	175,362	121,852

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Collateralized Transactions (Detail) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Financial instruments owned and pledged where the counterparty has the right to repledge [Abstract]
Stocks	$ 1,676,779	$ 1,633,383
U.S. and foreign government obligations	301,379	368,105
Financial Instruments Owned and Pledged as Collateral - Eligible to be Repledged by Counterparty	$ 1,978,158	$ 2,001,488

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Fair Value (Tables)

6 Months Ended

Jun. 30, 2011

Notes to Consolidated Financial Statements

Fair Value Table

			Financial Assets At Fair Value as of June 30, 2011
			Level 1		Level 2		Level 3		Total
Securities segregated for regulatory purposes		$	397,694	$	440,471	$	-	$	838,165
Financial instruments owned:
	Stocks		621,422		-		-		621,422
	Options		3,277,354		-		-		3,277,354
	U.S. and foreign government obligations		15,610		-		-		15,610
	Warrants		56,948		-		-		56,948
	Corporate and municipal bonds		51,503		51,428		-		102,931
	Discount certificates		50,366		-		-		50,366
	Currency forward contracts		-		674		-		674
			4,073,203		52,102		-		4,125,305
Financial instruments owned and pledged as collateral:
	Stocks		1,676,779		-		-		1,676,779
	U.S. and foreign government obligations		301,379		-		-		301,379
			1,978,158		-		-		1,978,158
			6,051,361		52,102		-		6,103,463
Other assets - investments in common stock			22,892		-		-		22,892
		$	6,471,947	$	492,573	$	-	$	6,964,520
			Financial Liabilities At Fair Value as of June 30, 2011
			Level 1		Level 2		Level 3		Total
Financial instruments sold, not yet purchased:
	Stocks	$	1,777,331	$	-	$	-	$	1,777,331
	Options		3,057,013		-		-		3,057,013
	U.S. and foreign government obligations		53		-		-		53
	Corporate bonds		53,681		49,573		-		103,254
	Currency forward contracts		-		2,325		-		2,325
		$	4,888,078	$	51,898	$	-	$	4,939,976

		Financial Assets At Fair Value as of December 31, 2010
			Level 1		Level 2		Level 3		Total
Securities segregated for regulatory purposes		$	146,976	$	440,773	$	-	$	587,749
Financial instruments owned:
	Stocks		1,318,003		-		-		1,318,003
	Options		3,893,695		-		-		3,893,695
	U.S. and foreign government obligations		8,408		-		-		8,408
	Warrants		85,740		-		-		85,740
	Corporate and municipal bonds		47,757		48,895		-		96,652
	Discount certificates		18,217		-		-		18,217
	Currency forward contracts		-		214		-		214
			5,371,820		49,109		-		5,420,929
Financial instruments owned and pledged as collateral:
	Stocks		1,633,383		-		-		1,633,383
	U.S. and foreign government obligations		368,105		-		-		368,105
			2,001,488		-		-		2,001,488
			7,373,308		49,109		-		7,422,417
Other assets - investments in common stock			-		2,239		-		2,239
		$	7,520,284	$	492,121	$	-	$	8,012,405
		Financial Liabilities At Fair Value as of December 31, 2010
			Level 1		Level 2		Level 3		Total
Financial instruments sold, not yet purchased:
	Stocks	$	2,256,259	$	-	$	-	$	2,256,259
	Options		3,765,862		-		-		3,765,862
	Warrants		12		-		-		12
	Corporate bonds		48,419		50,734		-		99,153
	Currency forward contracts		-		3,938		-		3,938
		$	6,070,552	$	54,672	$	-	$	6,125,224

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Commitments, Contingencies and Guarantees

6 Months Ended

Jun. 30, 2011

Notes to Consolidated Financial Statements

Commitments, Contingencies and Guarantees

11.   Commitments, Contingencies and Guarantees

Litigation

The Company is subject to certain pending and threatened legal actions which arise out of the normal course of business. Litigation is inherently unpredictable, particularly in proceedings where claimants seek substantial or indeterminate damages, or which are in their early stages.  IBG, Inc. cannot predict with certainty the actual loss or range of loss related to such legal proceedings, the manner in which they will be resolved, the timing of final resolution or the ultimate settlement.  Consequently, IBG, Inc. cannot estimate losses or ranges of losses related to such legal matters, even in instances where it is reasonably possible that a future loss will be incurred.  Although the results of legal actions cannot be predicted with certainty, it is the opinion of management that the resolution of these actions is not expected to have a material adverse effect, if any, on our business or financial condition, but may have a material impact on the results of operations for a given period.

On February 3, 2010, Trading Technologies International, Inc. ("Trading Technologies") filed a complaint in the United States District Court for the Northern District of Illinois, Eastern Division, against Interactive Brokers Group, Inc., IBG LLC, IBG Holdings LLC, and Interactive Brokers LLC.  Thereafter, Trading Technologies dismissed Interactive Brokers Group, Inc. and IBG Holdings LLC from the case, leaving only IBG LLC and Interactive Brokers LLC as defendants ("Defendants").  The operative complaint, as amended, alleges that the Defendants have infringed and continue to infringe twelve U.S. patents held by Trading Technologies.  Trading Technologies is seeking, among other things, unspecified damages and injunctive relief.  The case is in the pleadings stage.  While it is too early to predict the outcome of the matter, we believe we have meritorious defenses to the allegations made in the complaint and intend to defend ourselves vigorously against them.  However, litigation is inherently uncertain and there can be no guarantee that the Company will prevail or that the litigation can be settled on favorable terms

IBG, Inc. accounts for potential losses related to litigation in accordance with ASC 450, Contingencies.  As of June 30, 2011 and December 31, 2010, reserves provided for potential losses related to litigation matters were not material.

Guarantees

Certain of the Operating Companies provide guarantees to securities clearing houses and exchanges which meet the accounting definition of a guarantee under ASC 460, Guarantees. Under the standard membership agreement, members are required to guarantee collectively the performance of other members.  Under the agreements, if another member becomes unable to satisfy its obligations to the clearinghouse, other members would be required to meet shortfalls.  In the opinion of management, the Operating Companies’ liability under these arrangements is not quantifiable and could exceed the cash and securities they have posted as collateral.  However, the potential for these Operating Companies to be required to make payments under these arrangements is remote.  Accordingly, no contingent liability is carried in the unaudited condensed consolidated statements of financial condition for these arrangements.

In connection with its retail brokerage business, IB LLC performs securities and commodities execution, clearance and settlement on behalf of its customers for whom it commits to settle trades submitted by such customers with the respective clearing houses.  If a customer fails to fulfill its obligation, IB LLC must fulfill the customer’s obligation with the trade counterparty.  No contingent liability is carried on the unaudited condensed consolidated statements of financial condition for such customer obligations.

Other Commitments

Certain clearing houses and clearing banks and firms used by certain Operating Companies are given a security interest in certain assets of those Operating Companies held by those clearing organizations.  These assets may be applied to satisfy the obligations of those Operating Companies to the respective clearing organizations.

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Significant Accounting Policies

6 Months Ended

Jun. 30, 2011

Notes to Consolidated Financial Statements

Significant Accounting Policies

2.   Significant Accounting Policies

Basis of Presentation

These unaudited condensed consolidated financial statements are presented in U.S. dollars and have been prepared pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”) regarding financial reporting with respect to Form 10-Q and accounting standards generally accepted in the United States of America (“U.S. GAAP”) promulgated in the FASB Accounting Standards Codification (“ASC” or the “Codification”).  These unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in IBG, Inc.’s Annual Report on Form 10-K filed with the SEC on February 28, 2011.

Gains and losses from foreign currency transactions are included in trading gains and losses where related to market making activities or in interest income where related to investment of customer funds as part of electronic brokerage activities in the unaudited condensed consolidated statements of comprehensive income.  Non-U.S. subsidiaries have a functional currency (i.e., the currency in which activities are primarily conducted) that is other than the U.S. dollar.  Such subsidiaries’ assets and liabilities are translated to U.S. dollars at period-end exchange rates, while revenues and expenses are translated at average exchange rates during the year.  Adjustments that result from translating amounts from a subsidiary’s functional currency to the U.S. dollar are reported as a component of accumulated other comprehensive income.

The Company has reclassified an increase of $1.1 billion in securities purchased under agreements to resell to an increase in cash and securities—segregated for regulatory purposes in the unaudited condensed consolidated statement of cash flows for the six months ended June 30, 2010. 

Principles of Consolidation

The unaudited condensed consolidated financial statements include the accounts of IBG, Inc. and its majority and wholly owned subsidiaries.  As sole managing member of IBG LLC, IBG, Inc. exerts control over the Group’s operations.  In accordance with ASC 810, Consolidation, the Company consolidates the Group’s consolidated financial statements and records as non-controlling interest the interests in the Group that IBG, Inc. does not own.  The Company’s policy is to consolidate all entities of which it owns more than 50% unless it does not have control.  All inter-company balances and transactions have been eliminated.  IBG, Inc. would also consolidate any Variable Interest Entities (“VIEs”) pursuant to ASC 860, Transfers and Servicing and ASC 810 of which it is the primary beneficiary.  IBG, Inc. currently is not the primary beneficiary of any such entities and therefore no VIEs are included in the unaudited condensed consolidated financial statements.

Use of Estimates

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts and disclosures in the unaudited condensed consolidated financial statements and accompanying notes.  Estimates, by their nature, are based on judgment and available information.  Therefore, actual results could differ materially from those estimates.  Such estimates include the estimated value of investments accounted for under the equity method of accounting, the estimated useful lives of property and equipment, including capitalized internally developed software, the allowance for doubtful accounts, compensation accruals, tax liabilities and estimated contingency reserves.

Fair Value

At June 30, 2011 and December 31, 2010, substantially all of IBG, Inc.’s assets and liabilities, including financial instruments, were carried at fair value based on published market prices and are marked to market daily, or were assets which are short-term in nature (such as U.S. government treasury bills or spot foreign exchange) and were carried at amounts that approximate fair value.

IBG, Inc. applies the fair value hierarchy of ASC 820, Fair Value Measurement, to prioritize the inputs to valuation techniques used to measure fair value.  The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets and liabilities and the lowest priority to unobservable inputs.  The three levels of the fair value hierarchy are:

Level 1	Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities;
Level 2	Quoted prices in markets that are not considered to be active or financial instruments for which all significant inputs are observable, either directly or indirectly; and
Level 3	Prices or valuations that require inputs that are both significant to fair value measurement and unobservable

Financial instruments owned and financial instruments sold, but not yet purchased, except forward currency contracts, over-the-counter (“OTC”) currency options and certain corporate and municipal debt securities, which are classified as Level 2 financial instruments, are classified within Level 1 of the fair value hierarchy.  Level 1 financial instruments, which are valued using quoted market prices as published by exchanges and clearing houses or otherwise broadly distributed in active markets, include U.S. government and sovereign obligations, active listed securities, options, futures, options on futures and corporate and municipal debt securities.  IBG, Inc. does not adjust quoted prices for Level 1 financial instruments, even in the event that the Company may hold a large position whereby a purchase or sale could reasonably impact quoted prices.  Currency forward contracts and OTC currency options are valued using broadly distributed bank and broker prices, and are classified as Level 2 financial instruments as such instruments are not exchange-traded.  Corporate and municipal debt securities, including Federal Deposit Insurance Corporation insured corporate bonds held as securities segregated for regulatory purposes, that are not actively traded are also classified in Level 2.  Investments in common stock reported in other assets in the unaudited condensed statement of financial condition are valued using quoted market prices.  These investments may include investments in restricted common stock, which would be valued using discounts from quoted market prices and,  therefore, would be reported as Level 2 financial instruments.

Earnings Per Share

Earnings per share (“EPS”) are computed in accordance with ASC 260, Earnings per Share.  Shares of Class A and Class B common stock share proportionately in the earnings of IBG, Inc.  Basic earnings per share are calculated utilizing net income available for common stockholders divided by the weighted average number of shares of Class A and Class B common stock outstanding for that period.  Diluted earnings per share are calculated utilizing the Company’s basic net income available for common stockholders divided by diluted weighted average shares outstanding with no adjustments to net income available to common stockholders for dilutive potential common shares.

Stock-Based Compensation

IBG, Inc. follows ASC 718, Compensation – Stock Compensation, to account for its stock-based compensation plans.  ASC 718 requires all share-based payments to employees to be recognized in the financial statements using a fair value-based method.  As a result, IBG, Inc. expenses the fair value of stock granted to employees over the related vesting period.

Cash and Cash Equivalents

IBG, Inc. defines cash equivalents as short-term, highly liquid securities and cash deposits with original maturities of three months or less, other than those used for trading purposes.

Cash and Securities — Segregated for Regulatory Purposes

As a result of customer activities, certain Operating Companies are obligated by rules mandated by their primary regulators to segregate or set aside cash or qualified securities to satisfy such regulations, which regulations have been promulgated to protect customer assets.  In addition, substantially all of the Operating Companies are members of various clearing organizations at which cash or securities are deposited as required to conduct day-to-day clearance activities.  Securities segregated for regulatory purposes consisted of Federal Deposit Insurance Corporation insured corporate bonds, which are recorded as Level 2 financial assets, in the amount of $440,471 and $440,773 at June 30, 2011 and December 31, 2010, U.S. Treasury Bills of $397,694 and $146,976 at June 30, 2011 and December 31, 2010, which are recorded as Level 1 financial assets and securities purchased under agreements to resell in the amount of $2,595,592 and $2,391,813 as of June 30, 2011 and December 31, 2010, respectively, which amounts approximate fair value.

Securities Borrowed and Securities Loaned

Securities borrowed and securities loaned are recorded at the amount of cash collateral advanced or received.  Securities borrowed transactions require IBG, Inc. to provide counterparties with collateral, which may be in the form of cash, letters of credit, or other securities.  With respect to securities loaned, IBG, Inc. receives collateral, which may be in the form of cash or other securities in an amount generally in excess of the fair value of the securities loaned.

IBG, Inc. monitors the market value of securities borrowed and loaned on a daily basis, with additional collateral obtained or refunded as permitted contractually.  Receivables and payables with the same counterparty are not offset in the unaudited condensed consolidated statements of financial condition.  For these transactions, the fees received or paid by IBG, Inc. are recorded as interest income or interest expense in the unaudited condensed consolidated statements of comprehensive income.

Securities Purchased Under Agreements to Resell

Securities purchased under agreements to resell are treated as collateralized financing transactions and are recorded at contract value, plus accrued interest, which approximates fair value. The Company’s policy is to obtain possession of collateral with a fair value equal to or in excess of the principal amount loaned under resale agreements.  To ensure that the fair value of the underlying collateral remains sufficient, this collateral is valued daily with additional collateral obtained or excess collateral returned, as permitted under contractual provisions.

Financial Instruments Owned and Sold But Not Yet Purchased

Stocks, government, corporate and municipal bonds, futures and options transactions are reported in the unaudited condensed consolidated financial statements on a trade date basis.  All financial instruments owned and financial instruments sold but not yet purchased are recorded at fair value based upon quoted market prices.  All firm-owned financial instruments pledged to counterparties where the counterparty has the right, by contract or custom, to sell or repledge the financial instruments are classified as financial instruments owned and pledged as collateral in the unaudited condensed consolidated statements of financial condition.

IBG, Inc. also enters into currency forward contracts.  These transactions, which are also reported on a trade date basis, are agreements to exchange a fixed amount of one currency for a specified amount of a second currency at completion of the currency forward contract term.  Unrealized mark-to-market gains and losses on currency forward contracts are reported as components of financial instruments owned or financial instruments sold but not yet purchased in the unaudited condensed consolidated statements of financial condition.  Net earnings or losses are reported as components of interest income in the unaudited condensed consolidated statements of comprehensive income.

Customer Receivables and Payables

Customer securities transactions are recorded on a settlement date basis and customer commodities transactions are recorded on a trade date basis.  Receivables from and payables to customers include amounts due on cash and margin transactions, including futures contracts transacted on behalf of customers.  Securities owned by customers, including those that collateralize margin loans or other similar transactions, are not reported in the unaudited condensed consolidated statements of financial condition.  Amounts receivable from customers that are determined by management to be uncollectible are written off to general and administrative expense.

Receivables from and Payables to Brokers, Dealers and Clearing Organizations

Receivables from brokers, dealers and clearing organizations include amounts receivable for securities not delivered by IBG, Inc. to the purchaser by the settlement date (“fails to deliver”) and margin deposits.  Payables to brokers, dealers and clearing organizations include amounts payable for securities not received by IBG, Inc. from a seller by the settlement date (“fails to receive”).  Receivables and payables to brokers, dealers and clearing organizations also include amounts related to futures contracts executed on behalf of customers as well as net payables and receivables from unsettled trades.

Investments

IBG, Inc. makes certain strategic investments and accounts for these investments under the cost method of accounting or under the equity method of accounting as required under ASC 323, Investments – Equity Method and Joint Ventures.  Investments are accounted for under the equity method of accounting, when IBG, Inc. has significant influence over the investee.  Investments accounted for under the equity method, including where the investee is a limited partnership or limited liability company, are recorded at the fair value amount of IBG, Inc.’s investment and adjusted each period for IBG, Inc.’s share of the investee’s income or loss.  IBG, Inc.’s share of the income or losses from equity investments is reported as a component of other income in the unaudited condensed consolidated statements of comprehensive income and the recorded amounts of IBG, Inc.’s equity investments, which are included in other assets in the unaudited condensed consolidated statements of financial condition, increase or decrease accordingly.  Distributions received from equity investees are recorded as reductions to the respective investment balance.

A judgmental aspect of accounting for investments is evaluating whether an other-than-temporary decline in the value of an investment has occurred.  The evaluation of an other-than-temporary impairment is dependent on specific quantitative and qualitative factors and circumstances surrounding an investment, including recurring operating losses, credit defaults and subsequent rounds of financing.  None of IBG, Inc.’s equity investments have readily determinable market values.  All equity investments are reviewed for changes in circumstances or occurrence of events that suggest IBG, Inc.’s investment may not be recoverable.  If an unrealized loss on any investment is considered to be other-than-temporary, the loss is recognized in the period the determination is made.  IBG, Inc. also holds exchange memberships and investments in equity securities of certain exchanges as required to qualify as a clearing member, and strategic investments in corporate stock that do not qualify for equity method accounting.  Such investments are recorded at cost or, if an other-than-temporary impairment in value has occurred, at a value that reflects management’s estimate of the impairment, and are included in other assets in the unaudited condensed consolidated statements of financial condition.  Dividends are recognized as a component of other income as such dividends are received.

Property and Equipment

Property and equipment, which is a component of other assets, consist of purchased technology hardware and software, internally developed software, leasehold improvements and office furniture and equipment.  Property and equipment are recorded at historical cost, less accumulated depreciation and amortization.  Additions and improvements that extend the lives of assets are capitalized, while expenditures for repairs and maintenance are expensed as incurred.  Depreciation and amortization are computed using the straight-line method.  Equipment is depreciated over the estimated useful lives of the assets, while leasehold improvements are amortized over the lesser of the estimated economic useful life of the asset or the term of the lease.  Computer equipment is depreciated over three to five years and office furniture and equipment are depreciated over five to seven years.  Qualifying costs for internally developed software are capitalized and amortized over the expected useful life of the developed software, not to exceed three years.

Comprehensive Income and Foreign Currency Translation

Comprehensive income consists of two components: net income and other comprehensive income.  Other comprehensive income refers to revenues, expenses, gains and losses that are included in stockholders’ equity but are excluded from net income.  IBG, Inc.’s other comprehensive income is comprised of foreign currency translation adjustments.

IBG, Inc.’s international Operating Companies have a functional currency (i.e., the currency in which activities are primarily conducted) that is other than the U.S. dollar.  Such subsidiaries’ assets and liabilities are translated into U.S. dollars at period-end exchange rates, and revenues and expenses are translated at average exchange rates prevailing during the period.  Translation gains and losses from market making and electronic brokerage activities, respectively, are included in trading gains and in other income in the accompanying unaudited condensed consolidated statements of comprehensive income.  Adjustments that result from translating amounts from a subsidiary’s functional currency are reported as a component of accumulated other comprehensive income.

Revenue Recognition

— Trading Gains

Trading gains and losses are recorded on trade date and are reported on a net basis.  Trading gains are comprised of changes in the fair value of trading assets and liabilities (i.e., unrealized gains and losses) and realized gains and losses.  Dividends are integral to the valuation of stocks and interest is integral to the valuation of fixed income instruments.  Accordingly, both dividends and interest income and expense attributable to specific trading assets and liabilities are reported on a net basis as a component of trading gains in the accompanying unaudited condensed consolidated statements of comprehensive income.

— Commissions and Execution Fees

Commissions charged for executing and clearing customer transactions are accrued on a trade date basis and are reported as commissions and execution fees in the unaudited condensed consolidated statements of comprehensive income, and the related expenses are reported as execution and clearing expenses, also on a trade date basis.

— Interest Income and Expense

The Company earns interest income and incurs interest expense primarily in connection with its Electronic Brokerage customer business and its securities lending activities.  Such interest is recorded on the accrual basis.

Income Taxes

IBG, Inc. accounts for income taxes in accordance with ASC 740, Income Taxes, which requires the recognition of tax benefits or expenses on the temporary differences between the financial reporting and tax bases of assets and liabilities, including the accounting for uncertainty of income tax positions and valuation allowances for deferred tax assets reported in financial statements, prescribing a “more likely than not” threshold and measurement attribute for recognition in the financial statements of an asset or liability resulting from a tax position taken or expected to be taken in an income tax return.

The Company’s provision for income taxes is comprised of two principal components: (1) the Group’s consolidated income tax expense, and (2) the Company’s U.S. Federal and state income taxes on its proportionate share of the Group’s income that is subject to tax.

The Group has historically operated in the United States as a limited liability company that was treated as a partnership for U.S. federal income tax purposes.  Accordingly, the Group’s income, which is allocated proportionately to the Group’s members, the Company and IBG Holdings LLC, is not subject to U.S. federal income taxes at the Group level.  Taxes related to income earned by partnerships represent obligations of the individual partners.  Therefore, income taxes attributable to the Group and included in income tax expense in the Company’s unaudited condensed consolidated statements of comprehensive income are primarily incurred in non-U.S. subsidiaries.  Outside the United States, the Group principally operates through subsidiary corporations and is subject to local income taxes.  In addition, state and local income taxes include taxes assessed on the Group by jurisdictions that do not recognize the Group’s limited liability company status.  Foreign income taxes paid by the Group on dividends received are also reported as income taxes.

IBG, Inc. recognizes interest related to income tax matters as interest income or expense and penalties related to income tax matters as income tax expense.

Recently Issued Accounting Pronouncements

Subsequent to the adoption of the ASC, the FASB will issue Accounting Standards Updates (“ASU’s”) as the means to add to or delete from, or otherwise amend the ASC.  In 2011, prior to the issuance of the Company’s unaudited condensed consolidated financial statements, ASU’s 2011-01 through ASU 2011-07 were issued.  Following is a summary of recently issued ASU’s that may affect the Company’s condensed consolidated financial statements:

	Affects	Status
ASU 2010-13	Compensation - Stock Compensation (Topic 718) - Effect of Denominating the Exercise Price of a Share-Based Payment Award in the Currency of the Market in Which the Underlying Equity Security Trades	Fiscal years, and interim periods within those fiscal years, beginning after December 15, 2010.  Early application is permitted.
ASU 2011-01	Receivables (Topic 310) - Deferral of the Effective Date of Disclosures about Troubled Debt Restructurings in Update No. 2010-20	Effective on issuance.
ASU 2011-02	Receivables (Topic 310) - A Creditor's Determination of Whether a Restructuring is a Troubled Debt Restructuring	First interim or annual period beginning after June 15, 2011, to be applied retrospectively to the beginning of the annual period of adoption.  Early adoption is permitted.
ASU 2011-03	Transfers and Servicing (Topic 860) - Reconsideration of Effective Control for Repurchase Agreements	Fiscal years, and interim periods within those fiscal years, beginning after December 15, 2011.  Early application is not permitted.
ASU 2011-04	Fair Value Measurement (Topic 820) - Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and IFRS	To be applied prospectively for interim and annual periods beginning after December 15, 2011.  Early adoption is not permitted for public entities.
ASU 2011-05	Comprehensive Income (Topic 220) - Presentation of Comprehensive Income	To be applied retrospectively, with reporting to commence in fiscal years beginning after December 15, 2011.  Early adoption is permitted.

Adoption of those ASU’s that became effective during 2011, prior to the issuance of the Company’s unaudited condensed consolidated financial statements, did not have a material effect on those financial statements.  Other than ASU 2011-05, which the Company adopted early, as permitted, for the quarter ended June 30, 2011, management is assessing the potential impact on the Company’s financial statements of adopting ASU’s that will become effective in the future.

ASC/IFRS Convergence

In February 2010, the SEC issued “Commission Statement in Support of Convergence and Global Accounting Standards”, a formal statement updating the status of its November 2008 “Roadmap for the Potential Use of Financial Statements Prepared in Accordance with International Financial Reporting Standards by U.S. Issuers” (“IFRS Roadmap”).  The statement supported convergence of accounting standards and the development of a single set of global accounting standards.  As directed in this statement, the SEC staff issued “Work Plan for the Consideration of Incorporating International Financial Reporting Standards into the Financial Reporting System for U.S. Issuers” (the “Work Plan”) in May 2010, and issued a follow-up Staff Paper, subtitled “Exploring a Possible Method of Incorporation” in May 2011.  The Work Plan outlines the steps to be taken to provide the SEC with information to be able to conclude whether IFRS should be adopted for U.S. registrants and the Staff Paper discusses alternative approaches (“Convergence” and “Endorsement”) to adoption that could be applied.  Within the Staff Paper, the SEC Staff has issued a Request for Comment on these alternatives.  The Comment period ended July 31, 2011 and the SEC Staff have not issued further reporting to date.  Neither the February statement, the Work Plan nor the Staff Paper define a certain date for adoption of IFRS. A decision on whether the SEC will mandate adoption of IFRS, in full or in part, may be made in 2011.  If a decision to adopt IFRS is made at that point in time, initial adoption for U.S. registrants would be approximately December 31, 2015 or 2016, with a transition date of either January 1, 2013 or 2014 for the initial three year retrospective comparative reporting period.  Management continues to assess the potential impact of adopting IFRS on the Company’s unaudited condensed consolidated financial statements.

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Comprehensive Income (Detail) (USD $) In Thousands, except Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Comprehensive income
Net income available for common stockholders	$ 9,561	$ 3,840	$ 25,812	$ 7,731
Other comprehensive income:
Cumulative Translation adjustment, before income taxes	6,067	(5,785)	8,072	(7,992)
Income taxes related to items of other comprehensive income	2,230	(2,126)	2,967	(2,937)
Other comprehensive income (loss), net of tax	3,837	(3,659)	5,105	(5,055)
Comprehensive income available for common stockholders	$ 13,398	$ 181	$ 30,917	$ 2,676
Earnings per share on comprehensive income:
Basic	$ 0.311	$ 0.004	$ 0.725	$ 0.064
Diluted	$ 0.308	$ 0.004	$ 0.717	$ 0.063
Weighted average common shares outstanding:
Basic	43,018,095	41,802,541	42,627,045	41,511,328
Diluted	43,470,928	42,441,995	43,133,155	42,206,384

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Senior Notes Payable

6 Months Ended

Jun. 30, 2011

Notes to Consolidated Financial Statements

Senior Notes Payable

8.   Senior Notes Payable

At June 30, 2011 and December 31, 2010, IBG LLC had $178,300 and $194,603, respectively, of senior notes outstanding. Senior notes issued during and subsequent to June 2011 have a 3% per annum interest rate. Of the senior notes outstanding at June 30, 2011 $147,913 were 5% notes and $30,387 were 3% notes. Of the senior notes outstanding at December 31, 2010 $46,918 were 7% notes and $147,685 were 5% notes.  All senior notes have either a 15-month or an 18-month maturity.  IBG LLC may, solely at its option, redeem the senior notes at any time on or after a specified date in the third month or the sixth month, respectively, after the date on which the senior notes are issued and sold (the “Optional Redemption Date”), at a redemption price equal to 100% of the principal amount of the senior notes to be redeemed plus accrued interest.

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Regulatory Requirements

6 Months Ended

Jun. 30, 2011

Notes to Consolidated Financial Statements

Regulatory Requirements

13.   Regulatory Requirements

At June 30, 2011, aggregate excess regulatory capital for all of the Operating Companies was $2.81 billion.

TH LLC, IB LLC and THSC are subject to the Uniform Net Capital Rule (Rule 15c3-1) under the Exchange Act and the CFTC’s minimum financial requirements (Regulation 1.17).  At June 30, 2011, TH LLC had net capital of $1,010,193, which was $961,722 in excess of required net capital of $48,471, IB LLC had net capital of $1,256,667, which was $1,052,101 in excess of required net capital of $204,566, and THSC had net capital of $1,696, which was $1,596 in excess of required net capital of $100.

THE is subject to the Swiss National Bank eligible equity requirement.  At June 30, 2011, THE had eligible equity of $660,838, which was $406,892 in excess of the minimum requirement of $253,646.

THSHK is subject to the Hong Kong Securities Futures Commission liquid capital requirement, THA is subject to the Australian Stock Exchange liquid capital requirement, THC and IBC are subject to the Investment Industry Regulatory Organization of Canada risk adjusted capital requirement, IBUK is subject to the U.K. Financial Services Authority financial resources requirement, IBI is subject to the National Stock Exchange of India net capital requirements and IBSJ is subject to the Japanese Financial Supervisory Agency capital requirements.

At June 30, 2011, all of the Operating Companies were in compliance with their respective regulatory capital requirements.

Regulatory capital requirements could restrict the Operating Companies from expanding their business and declaring dividends if their net capital does not meet regulatory requirements.  Also, certain entities within IBG, Inc. are subject to other regulatory restrictions and requirements.

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Senior Secured Revolving Credit Facility

6 Months Ended

Jun. 30, 2011

Notes to Consolidated Financial Statements

Senior Secured Revolving Credit Facility

9. Senior Secured Revolving Credit Facility

On May 18, 2010, IBG LLC entered into a $100 million two-year senior secured revolving credit facility with Bank of America, N.A. as administrative agent and Citibank, N.A., as syndication agent.  IBG LLC is the sole borrower under this credit facility.  The facility’s interest rate is indexed to the overnight federal funds rate or to the LIBOR rate for the relevant term, at the borrower’s option, and is secured by a first priority interest in all of the capital stock of each entity owned directly by IBG LLC (subject to customary limitations with respect to foreign subsidiaries).  The facility may be used to finance working capital needs and general corporate purposes, including downstreaming funds to IBG LLC’s regulated broker-dealer subsidiaries as regulatory capital.  This allows IBG LLC to take advantage of market opportunities when they arise, while maintaining substantial excess regulatory capital.  The financial covenants contained in this credit facility are as follows:

· minimum consolidated shareholders’ equity, as defined, of $3.625 billion, with quarterly increases equal to 25% of positive consolidated net income;

·      maximum total debt to capitalization ratio of 30%;

·      minimum liquidity ratio of 1.0 to 1.0; and

·      maximum total debt to net regulatory capital ratio of 35%.

At maturity, subject to meeting certain terms of the facility, the Company will have an option to convert the facility to a one-year term loan.  At June 30, 2011, no borrowings were outstanding under this credit facility and IBG LLC was in compliance with all of the covenants.  This credit facility replaced a $100 million senior secured revolving credit facility that matured on May 19, 2010.

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Equity and Earnings Per Share Basic (Detail) (USD $) In Thousands, except Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Basic earnings per share:
Net income available for common stockholders	$ 9,561	$ 3,840	$ 25,812	$ 7,731
Weighted average shares of common stock outstanding:
Basic	43,018,095	41,802,541	42,627,045	41,511,328
Basic earnings per share	$ 0.22	$ 0.09	$ 0.61	$ 0.18
Common Class A
Weighted average shares of common stock outstanding:
Basic	43,017,995	41,802,441	42,626,945	41,511,228
Common Class B
Weighted average shares of common stock outstanding:
Basic	100	100	100	100

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Collateralized Transactions

6 Months Ended

Jun. 30, 2011

Notes to Consolidated Financial Statements

Collateralized Transactions

7.   Collateralized Transactions

The Company enters into securities borrowing and lending transactions and agreements to repurchase and resell securities to finance trading inventory, to obtain securities for settlement and to earn residual interest rate spreads.  In addition, the Company’s customers pledge their securities owned to collateralize margin loans.  Under these transactions, the Company either receives or provides collateral, including equity, corporate debt and U.S. government securities.  Under many agreements, the Company is permitted to sell or repledge securities received as collateral and use these securities to secure repurchase agreements, enter into securities lending transactions or deliver these securities to counterparties to cover short positions.  At June 30, 2011 and December 31, 2010, the fair value of securities received as collateral where the Company is permitted to sell or repledge the securities was approximately $19.0 and $15.7 billion, respectively, of which $6.7 and $6.6 billion, respectively, had been repledged or resold, of which some were deposited in a separate bank account for the exclusive benefit of customers in accordance with SEC Rule 15c3-3.  The sources of collateral at June 30, 2011 and December 31, 2010 were: securities lending transactions and agreements to resell of $6.0 and $5.9 billion; and customer margin securities of $13.0 and $9.8 billion, respectively.

In the normal course of business, the Company pledges qualified securities with clearing organizations to satisfy daily margin and clearing fund requirements.  At June 30, 2011, substantially all government obligations owned were pledged to clearing organizations.

Financial instruments owned and pledged, where the counterparty has the right to repledge, at June 30, 2011 and December 31, 2010 consisted of the following:

		June 30,		December 31,
		2011		2010
Stocks	$	1,676,779	$	1,633,383
U.S. and foreign government obligations		301,379		368,105
	$	1,978,158	$	2,001,488

The Company also engages in securities financing transactions with and for customers through margin lending.  Under these agreements and transactions, the Company either receives or provides collateral, including U.S. government securities, corporate debt and equity securities.  Customer receivables generated from margin lending activity are collateralized by customer-owned securities held by the Company.  Customers’ required margin levels and established credit limits are monitored continuously by risk management staff using automated systems.  Pursuant to Company policy and as enforced by such systems, customers are required to deposit additional collateral or reduce positions, when necessary to avoid automatic liquidation of positions.

Margin loans are extended on a demand basis and are not committed facilities.  Factors considered in the acceptance or rejection of margin loans are the amount of the loan, the degree of leverage being employed in the account and an overall evaluation of the portfolio to ensure proper diversification or, in the case of concentrated positions, appropriate liquidity of the underlying collateral.  Additionally, transactions relating to concentrated or restricted positions are limited or prohibited by raising the level of required margin collateral (to 100% in the extreme case).  Underlying collateral for margin loans is evaluated with respect to the liquidity of the collateral positions, valuation of securities, volatility analysis and an evaluation of industry concentrations.  Adherence to the Company’s collateral policies significantly limits the Company’s credit exposure to margin loans in the event of a customer’s default.  Under margin lending agreements, the Company may request additional margin collateral from customers and may sell securities that have not been paid for or purchase securities sold but not delivered from customers, if necessary.  At June 30, 2011 and December 31, 2010, there were approximately $9.3 billion and $7.0 billion, respectively, of customer margin loans outstanding.

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Condensed Consolidated Statements of Changes in Equity (Unaudited) (USD $) In Thousands, except Share data	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Income	Total Stockholders' Equity	Non-controlling Interests
Balance at Dec. 31, 2010	$ 4,220,487	$ 503	$ 535,630	$ (161,947)	$ 92,504	$ 21,137	$ 487,827	$ 3,732,660
Balance (in shares) at Dec. 31, 2010		42,231,651
Common stock distributed to employees	29,405			29,405			29,405	0
Common Stock distributed to employees (in shares)		1,350,309
Redemption of former member interests	(815)		(88)				(88)	(727)
Dividends paid to shareholders	(4,358)				(4,358)		(4,358)	0
Dividends paid by IBG LLC to non-controlling interests	(70,930)						0	(70,930)
Adjustments for changes in proportionate ownership in IBG LLC	0		(13,108)				(13,108)	13,108
Total comprehensive income	411,754				25,812	5,105	30,917	380,837
Balance at Jun. 30, 2011	$ 4,585,543	$ 503	$ 522,434	$ (132,542)	$ 113,958	$ 26,242	$ 530,595	$ 4,054,948
Balance (in shares) at Jun. 30, 2011		43,581,960

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Trading Activities and Related Risks

6 Months Ended

Jun. 30, 2011

Notes to Consolidated Financial Statements

Trading Activities and Related Risks

3.   Trading Activities and Related Risks

IBG, Inc.’s trading activities include providing securities market making and brokerage services.  Trading activities expose IBG, Inc. to market and credit risks.  These risks are managed in accordance with established risk management policies and procedures.  To accomplish this, management has established a risk management process that includes:

· a regular review of the risk management process by executive management as part of its oversight role;

· defined risk management policies and procedures supported by a rigorous analytic framework; and

· articulated risk tolerance levels as defined by executive management that are regularly reviewed to ensure that IBG, Inc.’s risk-taking is consistent with its business strategy, capital structure, and current and anticipated market conditions.

Market Risk

IBG, Inc. is exposed to various market risks.  Exposures to market risks arise from equity price risk, foreign currency exchange rate fluctuations and changes in interest rates.  IBG, Inc. seeks to mitigate market risk associated with trading inventories by employing hedging strategies that correlate rate, price and spread movements of trading inventories and related financing and hedging activities.  IBG, Inc. uses a combination of cash instruments and exchange traded derivatives to hedge its market exposures.  The following discussion describes the types of market risk faced:

Equity Price Risk

Equity price risk arises from the possibility that equity security prices will fluctuate, affecting the value of equity securities and other instruments that derive their value from a particular stock, a defined basket of stocks, or a stock index.  IBG, Inc. is subject to equity price risk primarily in securities owned and securities sold but not yet purchased.  IBG, Inc. attempts to limit such risks by continuously reevaluating prices and by diversifying its portfolio across many different options, futures and underlying securities and avoiding concentrations of positions based on the same underlying security.

Currency Risk

Currency risk arises from the possibility that fluctuations in foreign exchange rates will impact the value of financial instruments.  Exchange rate contracts may include cross-currency swaps and currency futures contracts.  Currency swaps are agreements to exchange future payments in one currency for payments in another currency.  These agreements are used to effectively convert assets or liabilities denominated in different currencies.  Currency futures are contracts for delayed delivery of currency at a specified future date.  IBG, Inc. uses currency swaps to manage the levels of its non-U.S. dollar currency balances and currency cash and futures to hedge its global exposure.

Interest Rate Risk

Interest rate risk arises from the possibility that changes in interest rates will affect the value of financial instruments.  IBG, Inc. is exposed to interest rate risk on cash and margin balances, positions carried in equity securities, options and futures and on its debt obligations.  These risks are managed through investment policies and by entering into interest rate futures contracts.

Credit Risk

IBG, Inc. is exposed to risk of loss if an individual, counterparty or issuer fails to perform its obligations under contractual terms (“default risk”).  Both cash instruments and derivatives expose IBG, Inc. to default risk.  IBG, Inc. has established policies and procedures for mitigating credit risk on principal transactions, including reviewing and establishing limits for credit exposure, maintaining collateral, and continually assessing the creditworthiness of counterparties.

The Company’s credit risk is limited in that substantially all of the contracts entered into are settled directly at securities and commodities clearing houses and a small portion is settled through member firms and banks with substantial financial and operational resources.  IBG, Inc. seeks to control the risks associated with its customer margin activities by requiring customers to maintain collateral in compliance with regulatory and internal guidelines.

In the normal course of business, IBG, Inc. executes, settles, and finances various customer securities transactions.  Execution of these transactions includes the purchase and sale of securities by IBG, Inc. that exposes IBG, Inc. to default risk arising from the potential that customers or counterparties may fail to satisfy their obligations.  In these situations, IBG, Inc. may be required to purchase or sell financial instruments at unfavorable market prices to satisfy obligations to customers or counterparties.  Liabilities to other brokers and dealers related to unsettled transactions (i.e., securities fails to receive) are recorded at the amount for which the securities were purchased, and are paid upon receipt of the securities from other brokers or dealers.  In the case of aged securities fails to receive, IBG, Inc. may purchase the underlying security in the market and seek reimbursement for any losses from the counterparty.

For cash management purposes, IBG, Inc. enters into short-term securities purchased under agreements to resell and securities sold under agreements to repurchase transactions (“repos”) in addition to securities borrowing and lending arrangements, all of which may result in credit exposure in the event the counterparty to a transaction is unable to fulfill its contractual obligations.  In accordance with industry practice, repos are collateralized by securities with a market value in excess of the obligation under the contract. Similarly, securities borrowed and loaned agreements are collateralized by deposits of cash or securities.  IBG, Inc. attempts to minimize credit risk associated with these activities by monitoring collateral values on a daily basis and requiring additional collateral to be deposited with or returned to IBG, Inc. as permitted under contractual provisions.

Concentrations of Credit Risk

IBG, Inc.’s exposure to credit risk associated with its trading and other activities is measured on an individual counterparty basis, as well as by groups of counterparties that share similar attributes.  Concentrations of credit risk can be affected by changes in political, industry, or economic factors.  To reduce the potential for risk concentration, credit limits are established and exposure is monitored in light of changing counterparty and market conditions.  As of June 30, 2011, the Company did not have any material concentrations of credit risk.

Off-Balance Sheet Risks

IBG, Inc. may be exposed to a risk of loss not reflected in the unaudited condensed consolidated financial statements for futures products, which represent obligations of IBG, Inc. to settle at contracted prices, which may require repurchase or sale in the market at prevailing prices.  Accordingly, these transactions result in off-balance sheet risk as IBG, Inc.’s cost to liquidate such futures contracts may exceed the amounts reported in IBG, Inc.’s unaudited condensed consolidated statements of financial condition.

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Senior Secured Revolving Credit Facility (Detail) (USD $)
In Millions, unless otherwise specified

6 Months Ended

Jun. 30, 2011

May 19, 2010

Senior Secured Revolving Credit Facility [Abstract]

Senior secured revolving credit facility

$ 100

$ 100

Minimum consolidated shareholders' equity

3,625

Quarterly Increases % of Positive Net Income

25.00%

Maximum debt to capitalization ratio

30.00%

Minimum liquidity ratio

minimum liquidity ratio of 1.0 to 1.0

Maximum debt to net regulatory capital ratio

35.00%

Outstanding debt under credit facility

$ 0

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IBG Holdings Redemption Schedule (Detail) (USD $) In Thousands, except Per Share data	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Equity and earnings per share
Fair value membership interests	$ 27,204	$ 14,738	$ 72,015
Price per equivalent class A share	$ 16.80	$ 14.85	$ 29.99

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Equity and Earnings Per Share

6 Months Ended

Jun. 30, 2011

Notes to Consolidated Financial Statements

Equity and Earnings Per Share

4.   Equity and Earnings Per Share

In connection with its IPO in May 2007, IBG, Inc. purchased 10.0% of the membership interests in IBG LLC from IBG Holdings LLC, became the sole managing member of IBG LLC and began to consolidate IBG LLC’s financial results into its financial statements.  IBG Holdings LLC wholly owns all Class B common stock, which common stock has voting rights in proportion to its ownership interests in IBG LLC, approximately 89.0% as of June 30, 2011.  The unaudited condensed consolidated financial statements reflect the results of operations and financial position of IBG, Inc., including consolidation of its investment in IBG LLC, and IBG Holdings LLC’s ownership interests in IBG LLC are reported as non-controlling interests.

Recapitalization and Post-IPO Capital Structure

Immediately prior to and immediately following the consummation of the IPO, IBG, Inc., IBG Holdings LLC, IBG LLC and the members of IBG LLC consummated a series of transactions collectively referred to herein as the “Recapitalization.” In connection with the Recapitalization, IBG, Inc., IBG Holdings LLC and the historical members of IBG LLC entered into an exchange agreement, dated as of May 3, 2007 (the “Exchange Agreement”), pursuant to which the historical members of IBG LLC received membership interests in IBG Holdings LLC in exchange for their membership interests in IBG LLC.  Additionally, IBG, Inc. became the sole managing member of IBG LLC.

In connection with the consummation of the IPO, IBG Holdings LLC used the net proceeds to redeem 10.0% of members’ interests in IBG Holdings LLC in proportion to their interests.  Immediately following the Recapitalization and IPO, IBG Holdings LLC owned approximately 90% of IBG LLC and 100% of IBG, Inc.’s Class B common stock, which has voting power in IBG, Inc. proportionate to the extent of IBG Holdings LLC’s ownership of IBG LLC.

The Exchange Agreement also provides for future redemptions of member interests and for the purchase of member interests in IBG LLC by IBG, Inc. from IBG Holdings LLC, which could result in IBG, Inc. acquiring the remaining member interests in IBG LLC that it does not own.  On an annual basis, holders of IBG Holdings LLC member interests are able to request redemption of such member interests over a minimum eight (8) year period following the IPO; 12.5% annually for seven (7) years and 2.5% in the eighth year.

Redemptions may be funded through two (2) methods.  Material redemptions would be funded from the proceeds of sales of additional shares of Class A Common Stock ("Common Stock"), although there have been no such additional sales of Common Stock through June 30, 2011.  Three hundred sixty (360) million shares of authorized Common Stock were reserved for such future sales.

In lieu of a sale of Common Stock, the Exchange Agreement provides that IBG LLC, using its available liquidity, may facilitate the redemption by IBG Holdings LLC of interests held by its members.  Subsequent to the IPO and with the consent of IBG Holdings LLC and IBG, Inc. (on its own behalf and acting as the sole managing member of IBG LLC), IBG LLC agreed to redeem membership interests from IBG Holdings LLC as follows:

				Price per Equivalent
		Fair Value		Class A Share
2008	$	72,015	$	29.99
2009		14,738		14.85
2010		27,204		16.80

As a consequence of these transactions, and distribution of shares to employees (Note 10), IBG, Inc.’s interest in IBG LLC has increased to approximately 11.0%, with IBG Holdings LLC owning the remaining 89.0% as of June 30, 2011.  The redemptions also resulted in an increase in the IBG Holdings LLC interest held by Thomas Peterffy and his affiliates from approximately 84.6% at the IPO to approximately 85.8% at June 30, 2011.

Since consummation of the IPO and Recapitalization, IBG, Inc.’s equity capital structure has been comprised of Class A and Class B common stock.  All shares of common stock have a par value of $0.01 per share and have identical rights to earnings and dividends and in liquidation.  As described previously in this Note 4, Class B common stock has voting power in IBG, Inc. proportionate to the extent of IBG Holdings LLC’s ownership of IBG LLC.  At June 30, 2011 and December 31, 2010, 1,000,000,000 shares of Class A common stock were authorized, of which 50,298,024 shares have been issued; and 43,581,860 and 42,231,551 shares were outstanding, respectively.  Class B common stock is comprised of 100 authorized shares, of which 100 shares were issued and outstanding as of June 30, 2011 and December 31, 2010, respectively.  In addition, 10,000 shares of preferred stock have been authorized, of which no shares are issued or outstanding as of June 30, 2011 and December 31, 2010, respectively.

As a result of a federal income tax election made by IBG LLC applicable to the acquisition of IBG LLC member interests by IBG, Inc. the income tax basis of the assets of IBG LLC acquired by IBG, Inc. have been adjusted based on the amount paid for such interests.  A deferred tax asset of $380,785 was recorded as of the IPO date, which deferred tax asset is a component of Other Assets in the unaudited condensed consolidated statement of financial condition and is being amortized as additional deferred income tax expense over 15 years, as allowable under current tax law.  As of June 30, 2011 and December 31, 2010, the unamortized balance of the deferred tax asset was $302,957 and $313,526, respectively.  IBG, Inc. also entered into an agreement (the “Tax Receivable Agreement”) with IBG Holdings LLC to pay IBG Holdings LLC (for the benefit of the former members of IBG LLC) 85% of the tax savings that IBG, Inc. actually realizes as the result of the tax basis increase.  As of the IPO date, a payable to IBG Holdings LLC of $323,668 was recorded by IBG, Inc. and is reported as Payable to Affiliate in the unaudited condensed consolidated statement of financial condition.  Amounts payable under the Tax Receivable Agreement are subject to repayment to IBG Holdings LLC annually upon the filing of IBG, Inc.’s federal income tax return.  The remaining 15%, $57,117, was accounted for as a permanent increase to additional paid-in capital in the unaudited condensed consolidated statement of financial condition.  The Company has paid IBG Holdings LLC a total of $38.8 million through June 30,2011 pursuant to the terms of the Tax Receivable Agreement.

Stock Repurchase Program

In September 2008, the Company’s Board of Directors approved the repurchase of up to eight (8) million shares of its Class A common stock by IBG LLC.  Shares may be purchased from time to time in the open market and in private transactions if the company deems the price appropriate.  In November 2008, 65,800 shares were repurchased at a cost of $866, and are being held as Treasury Stock.

Earnings per Share

Basic earnings per share are calculated utilizing net income available for common stockholders divided by the weighted average number of shares of Class A and Class B common stock outstanding for that period:

			Three months ended				Six months ended
			June 30,				June 30,
			2011		2010		2011		2010
Basic earnings per share:
	Net income available for common stockholders	$	9,561	$	3,840	$	25,812	$	7,731
	Weighted average shares of common stock outstanding:
Class A			43,017,995		41,802,441		42,626,945		41,511,228
Class B			100		100		100		100
			43,018,095		41,802,541		42,627,045		41,511,328
	Basic earnings per share	$	0.22	$	0.09	$	0.61	$	0.18

Diluted earnings per share are calculated utilizing the Company’s basic net income available for common stockholders divided by diluted weighted average shares outstanding with no adjustments to net income available to common stockholders for dilutive potential common shares:

					Three months ended				Six months ended
					June 30,				June 30,
					2011		2010		2011		2010
Diluted earnings per share:
	Net income available for common stockholders - basic			$	9,561	$	3,840	$	25,812	$	7,731
	Adjustments for potentially dilutive common shares				-		-		-		-
	Net income available for common stockholders			$	9,561	$	3,840	$	25,812	$	7,731
	Weighted average shares of common stock outstanding:
		Class A:
			Issued and outstanding		43,017,995		41,802,441		42,626,945		41,511,228
Potentially dilutive common shares:
Issuable pursuant to 2007 ROI Unit Stock Plan					452,833		639,454		506,110		695,056
		Class B			100		100		100		100
					43,470,928		42,441,995		43,133,155		42,206,384
	Diluted earnings per share			$	0.22	$	0.09	$	0.60	$	0.18

Member and Stockholder Dividends

In April and June 2011, IBG LLC paid dividends to its members totaling $81.0 million, of which IBG, Inc.’s proportionate share was $10.1 million. On April 21, 2011, the Company declared a quarterly cash dividend of $0.10 per share of Common Stock, totaling $4.4 million, which was paid on June 14, 2011 to shareholders of record as of May 27, 2011.  In addition, holders of unvested Class A shares will receive payments in lieu of the quarterly dividend totaling $0.6 million, recorded as compensation expense.  The remainder of the dividends received by the Company has been retained to fund its income tax liabilities.

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Defined Contribution and Employee Incentive Plan SIP Grants (Detail) (USD $) In Thousands, except Share data	50 Months Ended
	Jun. 30, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2007	Jul. 31, 2007	May 03, 2007
SIP Share Grants
Shares granted		2,513,738	2,448,031	2,065,432	1,055,206	16,665	927,943
Fair Value - Date of Grant ($000's)		$ 43,255	$ 42,796	$ 35,600	$ 32,876	$ 404	$ 27,847
Shares Granted IPO to Date	9,027,015
Fair Value - Date of Grant ($000's) IPO to Date	$ 182,778

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Segment and Geographic Information (Tables)

6 Months Ended

Jun. 30, 2011

Notes to Consolidated Financial Statements

Segment and geographic information

		Three months ended						Six months ended
		June 30,						June 30,
		2011			2010			2011			2010
Net revenues:
Market making	$	125,726		$	81,644		$	328,064		$	164,425
Electronic brokerage		169,715			144,581			333,375			271,773
Corporate and eliminations		1,499			(89	)		3,389			508
Total net revenues	$	296,940		$	226,136		$	664,828		$	436,706
Income before income taxes:
Market making	$	59,186		$	3,889		$	193,852		$	9,345
Electronic brokerage		88,973			72,324			179,059			136,696
Corporate and eliminations		985			(4,137	)		(1,795	)		(9,052	)
Total income before income taxes	$	149,144		$	72,076		$	371,116		$	136,989
		June 30,			December 31,
		2011			2010
Segment assets:
Market making	$	13,719,629		$	14,609,564
Electronic brokerage		20,959,763			17,356,632
Corporate and eliminations		(4,039,137	)		(3,467,428	)
Total assets	$	30,640,255		$	28,498,768

		Three months ended						Six months ended
		June 30,						June 30,
		2011			2010			2011			2010
Net revenues:
United States	$	252,693		$	181,837		$	510,301		$	343,932
International		45,886			44,725			154,256			92,631
Corporate and eliminations		(1,639	)		(426	)		271			143
Total net revenues	$	296,940		$	226,136		$	664,828		$	436,706
Income before income taxes:
United States	$	161,134		$	90,184		$	337,582		$	164,128
International		(9,958	)		(13,606	)		38,212			(17,707	)
Corporate and eliminations		(2,032	)		(4,502	)		(4,678	)		(9,432	)
Total income before income taxes	$	149,144		$	72,076		$	371,116		$	136,989

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Equity and Earnings Per Share Diluted (Detail) (USD $) In Thousands, except Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Diluted earnings per share:
Net income available for common stockholders - basic	$ 9,561	$ 3,840	$ 25,812	$ 7,731
Adjustments for potentially dilutive common shares	0	0	0	0
Net income available for common stockholders	$ 9,561	$ 3,840	$ 25,812	$ 7,731
Weighted average shares of common stock outstanding:
Weighted Average Number of Shares Outstanding, Basic	43,018,095	41,802,541	42,627,045	41,511,328
Issuable pursuant to 2007 ROI Unit Stock Plan	452,833	639,454	506,110	695,056
Potentially dilutive common shares:
Weighted Average Number of Shares Outstanding, Diluted	43,470,928	42,441,995	43,133,155	42,206,384
Diluted earnings per share	$ 0.22	$ 0.09	$ 0.60	$ 0.18
Common Class A
Weighted average shares of common stock outstanding:
Weighted Average Number of Shares Outstanding, Basic	43,017,995	41,802,441	42,626,945	41,511,228
Common Class B
Weighted average shares of common stock outstanding:
Weighted Average Number of Shares Outstanding, Basic	100	100	100	100

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Defined Contribution and Employee Incentive Plan Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified

6 Months Ended

50 Months Ended

Jun. 30, 2011

Jun. 30, 2010

Jun. 30, 2011

Dec. 31, 2010

May 03, 2007

Dec. 31, 2006

Defined contribution and employee incentive plan additional information

ROI Dollar Unit Payable

$ 9,518

$ 9,518

$ 15,415

Vested balance of ROI payable

0

0

4,613

ROI dollar compensation expense

928

208

Common Stock Shares issued under ROI Unit Stock Plan

1,271,009

ROI Shares issued to IBG LLC

1,250,000

2007 SIP shares issued under ROI Unit Stock Plan

21,009

Vesting Percentage

· 10% on the first vesting date, which approximates the anniversary of the IPO; and

· an additional 15% on each of the following six anniversaries of the first vesting, assuming continued employment with IBG, Inc. and compliance with non-competition and other applicable covenants.

Fair Value ROI Accrual

17,806

Fair value ROI Treasury Stock

38,143

Compensation Expense, ROI Unit Stock Plan

2,163

1,671

Estimated future compensation for unvested awards ROI Unit Stock Plan

7,600

7,600

Maximum shares of stock distributable under 2007 Stock Incentive Plan

20,000,000

20,000,000

Increase in 2007 Stock Incentive Plan shares

10,800,000

10,800,000

2007 Stock Incentive Plan Compensation Expense

19,147

18,496

Estimated Future 2007 Stock Incentive Plan Compensation Expense

$ 53,600

$ 53,600

Percent of shares forfeited post employment

50.00%

Over 59 percent of shares eligible

100.00%

Former employees vesting schedule (Years)

5

Post employment vesting percentage (Years 1 - 4)

12.50%

Post employment vesting percentage (Year 5)

50.00%

Post employment shares distribution

11,050

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Significant Accounting Policies (Detail) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
Significant accounting policies
Reverse Repurchase Reclassification	$ 1,100,000
FDIC Insured Corporate Bonds	440,471	440,773
U.S. Treasury Bills	397,694	146,976
Securities Purchased Under Agreement to Resell Segregated for Regulatory Purposes	$ 2,595,592	$ 2,391,813
Property and equipment useful lives	Computer equipment is depreciated over three to five years and office furniture and equipment are depreciated over five to seven years.  Qualifying costs for internally developed software are capitalized and amortized over the expected useful life of the developed software, not to exceed three years.

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Segment and Geographic Information

6 Months Ended

Jun. 30, 2011

Notes to Consolidated Financial Statements

Segment and Geographic Information

12.   Segment and Geographic Information

IBG, Inc. operates in two business segments, market making and electronic brokerage.  The Company conducts its market making business principally through its Timber Hill subsidiaries on the world’s leading exchanges and market centers, primarily in exchange-traded equities, equity options and equity-index options and futures.  IBG, Inc. conducts its electronic brokerage business through its Interactive Brokers subsidiaries, which provide electronic execution and clearing services to customers worldwide.

There are significant transactions and balances between the Operating Companies, primarily as a result of certain Operating Companies holding exchange or clearing organization memberships, which are utilized to provide execution and clearing services to affiliates. Charges for transactions between segments are designed to approximate full costs.  Intra-segment and intra-region income and expenses and related balances have been eliminated in this segment and geographic information to accurately reflect the external business conducted in each segment or geographical region.  Corporate items include non-allocated corporate income and expenses that are not attributed to segments for performance measurement, corporate assets and eliminations.

Management believes that the following information by business segment provides a reasonable representation of each segment’s contribution to total net revenues and income before income taxes for the three and six months ended June 30, 2011 and 2010, and to total assets as of June 30, 2011 and December 31, 2010:

		Three months ended						Six months ended
		June 30,						June 30,
		2011			2010			2011			2010
Net revenues:
Market making	$	125,726		$	81,644		$	328,064		$	164,425
Electronic brokerage		169,715			144,581			333,375			271,773
Corporate and eliminations		1,499			(89	)		3,389			508
Total net revenues	$	296,940		$	226,136		$	664,828		$	436,706
Income before income taxes:
Market making	$	59,186		$	3,889		$	193,852		$	9,345
Electronic brokerage		88,973			72,324			179,059			136,696
Corporate and eliminations		985			(4,137	)		(1,795	)		(9,052	)
Total income before income taxes	$	149,144		$	72,076		$	371,116		$	136,989
		June 30,			December 31,
		2011			2010
Segment assets:
Market making	$	13,719,629		$	14,609,564
Electronic brokerage		20,959,763			17,356,632
Corporate and eliminations		(4,039,137	)		(3,467,428	)
Total assets	$	30,640,255		$	28,498,768

In connection with its ongoing review and analysis of the costs of operating its businesses commencing in the second quarter of 2011, IBG LLC has increased its allocation of corporate expenses to the operating segments in the form of intercompany administrative fees to include non-cash compensation, primarily SIP costs.  Increased intercompany administrative fees, which are eliminated in consolidation, will affect the operating segments’ income before income taxes.  The effect for the three months ended June 30, 2011 was an increase in net costs charged to the Electronic Brokerage and Market Making segments of $2,098 and $1,552, respectively, offset by an increase in intercompany fee revenue recognized in the Corporate segment.

     The Company operates its automated global business in U.S. and international markets on more than 90 exchanges and market centers.  A significant portion of IBG, Inc.’s net revenues are generated by subsidiaries operating outside the United States.  International operations are comprised of market making and electronic brokerage activities in 26 countries in Europe, Asia and North America (outside the United States).  The following table presents total net revenues and income before income taxes by geographic area for the three and six months ended June 30, 2011 and 2010:

		Three months ended						Six months ended
		June 30,						June 30,
		2011			2010			2011			2010
Net revenues:
United States	$	252,693		$	181,837		$	510,301		$	343,932
International		45,886			44,725			154,256			92,631
Corporate and eliminations		(1,639	)		(426	)		271			143
Total net revenues	$	296,940		$	226,136		$	664,828		$	436,706
Income before income taxes:
United States	$	161,134		$	90,184		$	337,582		$	164,128
International		(9,958	)		(13,606	)		38,212			(17,707	)
Corporate and eliminations		(2,032	)		(4,502	)		(4,678	)		(9,432	)
Total income before income taxes	$	149,144		$	72,076		$	371,116		$	136,989

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Comprehensive Income

6 Months Ended

Jun. 30, 2011

Notes to Consolidated Financial Statements

Comprehensive Income

5.  Comprehensive Income

Comprehensive income is comprised of Net Income and Other Comprehensive Income (“OCI”).  The Company’s OCI is comprised of foreign currency translation adjustments, which arise from changes in the US Dollar value of the net worth of the Company’s international Operating Companies during respective reporting periods.  The following table presents Comprehensive Income, net of income taxes, and Earnings Per Share on Comprehensive Income:

		Three months ended					Six months ended
		June 30,					June 30,
		2011		2010			2011		2010
Net income available for common stockholders		$	9,561	$	3,840		$	25,812	$	7,731
Other comprehensive income:
	Cumulative translation adjustment, before income taxes		6,067		(5,785	)		8,072		(7,992	)
	Income taxes related to items of other comprehensive income		2,230		(2,126	)		2,967		(2,937	)
Other comprehensive income (loss), net of tax			3,837		(3,659	)		5,105		(5,055	)
Comprehensive income available for common stockholders		$	13,398	$	181		$	30,917	$	2,676
Earnings per share on comprehensive income:
	Basic	$	0.311	$	0.004		$	0.725	$	0.064
	Diluted	$	0.308	$	0.004		$	0.717	$	0.063
Weighted average common shares outstanding:
	Basic		43,018,095		41,802,541			42,627,045		41,511,328
	Diluted		43,470,928		42,441,995			43,133,155		42,206,384

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Subsequent Events

6 Months Ended

Jun. 30, 2011

Notes to Consolidated Financial Statements

Subsequent events

15. Subsequent Events

As required by ASC 855-10-50, the Company has evaluated subsequent events for adjustment to or disclosure in its unaudited condensed consolidated financial statements through the date the unaudited condensed consolidated financial statements were issued.  

 On August 4, 2011, the Company filed a shelf Registration Statement on Form S-3 with the SEC for the issuance of additional shares in connection with IBGH requesting redemption of a portion of its member interests in IBG LLC (Note 4).  On August 4, 2011, a Supplemental Prospectus (File Number 333-176053) was filed by the Company with the SEC to issue 1,983,624 shares of Common Stock in exchange for an equivalent number of shares of member interests in IBG LLC.  This issuance of shares increased the Company’s ownership in IBG LLC from 11.0% to 11.5%.

                 No other recordable or disclosable events occurred through this date.

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Senior Notes Payable (Detail) (USD $)
In Thousands, unless otherwise specified

6 Months Ended

Jun. 30, 2011

Dec. 31, 2010

Senior Notes Payable [Abstract]

Senior notes payable

$ 178,300

$ 194,603

Senior Notes at 7%

0

46,918

Senior Notes at 5%

147,913

147,685

Senior Notes at 3%

$ 30,387

$ 0

Percent of principal and at which senior notes are able to be redeemed

100.00%

Time to maturity senior notes

All senior notes have either a 15-month or an 18-month maturity

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Organization and Nature of Business (Detail)	Aug. 04, 2011	Jun. 30, 2011	May 03, 2007
Organization and Nature of Business
IBG Inc. ownership % of IBG LLC	11.50%	11.00%	10.00%

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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash flows from operating activities:
Net income	$ 339,888	$ 124,455
Adjustments to reconcile net income to net cash provided by operating activities:
Translation losses	20,185	158,614
Deferred income taxes	9,246	3,554
Depreciation and amortization	9,360	9,052
Employee stock plan compensation	21,310	20,166
(Gains) losses on non-trading investments, net	(3,768)	768
Bad debt expense and other	2,695	2,486
Change in operating assets and liabilities:
Increase in cash and securities - segregated for regulatory purposes	(919,777)	(400,000)
Decrease in securities borrowed	81,963	926,243
Decrease (increase) in securities purchased under agreements to resell	32,008	(155,175)
Decrease (increase) in trading assets	1,337,548	252,067
Increase in receivables from customers	(2,348,938)	(1,202,495)
Increase in other receivables	(213,533)	(138,845)
Decrease (increase) in other assets	1	(1,361)
Decrease in trading liabilities	(1,172,320)	(921,995)
Increase in securities loaned	100,884	266,909
Increase in payable to customers	3,094,694	1,392,358
Increase in other payables	24,760	229,982
Net cash provided by operating activities	416,206	566,783
Cash flows from investing activities:
Purchase of investments, net	(16,707)	(1)
Purchase of property and equipment	(6,991)	(10,885)
Net cash used in investing activities	(23,698)	(10,886)
Cash flows from financing activities:
Dividends paid to non-controlling interests	(70,930)	(81,160)
Dividends paid to common shareholders	(4,358)	0
Redemption of member interests from IBG Holdings LLC	0	(27,204)
Redemption of former member interest	(815)	0
Issuance of senior notes	264,680	320,058
Redemptions of senior notes	(280,983)	(294,981)
Repayments of senior secured credit facility	(100,000)	0
Decrease in short-term borrowings, net	(155,200)	(151,979)
Net cash used in financing activities	(347,606)	(235,266)
Effect of exchange rate on cash and cash equivalents	23,814	(16,147)
Net increase in cash and cash equivalents	68,716	304,484
Cash and cash equivalents at beginning of period	1,354,219	806,560
Cash and cash equivalents at beginning of period	1,422,935	1,111,044
Supplemental disclosures of cash flow information:
Cash paid for interest	40,759	34,190
Cash paid for taxes	54,558	60,659
Non-cash financing activities
Adjustments to Additional Paid in Capital for changes in proportionate ownership in IBG LLC	(13,108)	0
Adjustments to Non-Controlling Interests for changes in proportionate ownership in IBG LLC	$ 13,108	$ 0

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Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2011

Significant accounting policies

Basis of Presentation

Basis of Presentation

These unaudited condensed consolidated financial statements are presented in U.S. dollars and have been prepared pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”) regarding financial reporting with respect to Form 10-Q and accounting standards generally accepted in the United States of America (“U.S. GAAP”) promulgated in the FASB Accounting Standards Codification (“ASC” or the “Codification”).  These unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in IBG, Inc.’s Annual Report on Form 10-K filed with the SEC on February 28, 2011.

Gains and losses from foreign currency transactions are included in trading gains and losses where related to market making activities or in interest income where related to investment of customer funds as part of electronic brokerage activities in the unaudited condensed consolidated statements of comprehensive income.  Non-U.S. subsidiaries have a functional currency (i.e., the currency in which activities are primarily conducted) that is other than the U.S. dollar.  Such subsidiaries’ assets and liabilities are translated to U.S. dollars at period-end exchange rates, while revenues and expenses are translated at average exchange rates during the year.  Adjustments that result from translating amounts from a subsidiary’s functional currency to the U.S. dollar are reported as a component of accumulated other comprehensive income.

The Company has reclassified an increase of $1.1 billion in securities purchased under agreements to resell to an increase in cash and securities—segregated for regulatory purposes in the unaudited condensed consolidated statement of cash flows for the six months ended June 30, 2010. 

Principles of Consolidation

Principles of Consolidation

The unaudited condensed consolidated financial statements include the accounts of IBG, Inc. and its majority and wholly owned subsidiaries.  As sole managing member of IBG LLC, IBG, Inc. exerts control over the Group’s operations.  In accordance with ASC 810, Consolidation, the Company consolidates the Group’s consolidated financial statements and records as non-controlling interest the interests in the Group that IBG, Inc. does not own.  The Company’s policy is to consolidate all entities of which it owns more than 50% unless it does not have control.  All inter-company balances and transactions have been eliminated.  IBG, Inc. would also consolidate any Variable Interest Entities (“VIEs”) pursuant to ASC 860, Transfers and Servicing and ASC 810 of which it is the primary beneficiary.  IBG, Inc. currently is not the primary beneficiary of any such entities and therefore no VIEs are included in the unaudited condensed consolidated financial statements.

Use of Estimates

Use of Estimates

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts and disclosures in the unaudited condensed consolidated financial statements and accompanying notes.  Estimates, by their nature, are based on judgment and available information.  Therefore, actual results could differ materially from those estimates.  Such estimates include the estimated value of investments accounted for under the equity method of accounting, the estimated useful lives of property and equipment, including capitalized internally developed software, the allowance for doubtful accounts, compensation accruals, tax liabilities and estimated contingency reserves.

Fair Value

Fair Value

At June 30, 2011 and December 31, 2010, substantially all of IBG, Inc.’s assets and liabilities, including financial instruments, were carried at fair value based on published market prices and are marked to market daily, or were assets which are short-term in nature (such as U.S. government treasury bills or spot foreign exchange) and were carried at amounts that approximate fair value.

IBG, Inc. applies the fair value hierarchy of ASC 820, Fair Value Measurement, to prioritize the inputs to valuation techniques used to measure fair value.  The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets and liabilities and the lowest priority to unobservable inputs.  The three levels of the fair value hierarchy are:

Level 1	Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities;
Level 2	Quoted prices in markets that are not considered to be active or financial instruments for which all significant inputs are observable, either directly or indirectly; and
Level 3	Prices or valuations that require inputs that are both significant to fair value measurement and unobservable

Financial instruments owned and financial instruments sold, but not yet purchased, except forward currency contracts, over-the-counter (“OTC”) currency options and certain corporate and municipal debt securities, which are classified as Level 2 financial instruments, are classified within Level 1 of the fair value hierarchy.  Level 1 financial instruments, which are valued using quoted market prices as published by exchanges and clearing houses or otherwise broadly distributed in active markets, include U.S. government and sovereign obligations, active listed securities, options, futures, options on futures and corporate and municipal debt securities.  IBG, Inc. does not adjust quoted prices for Level 1 financial instruments, even in the event that the Company may hold a large position whereby a purchase or sale could reasonably impact quoted prices.  Currency forward contracts and OTC currency options are valued using broadly distributed bank and broker prices, and are classified as Level 2 financial instruments as such instruments are not exchange-traded.  Corporate and municipal debt securities, including Federal Deposit Insurance Corporation insured corporate bonds held as securities segregated for regulatory purposes, that are not actively traded are also classified in Level 2.  Investments in common stock reported in other assets in the unaudited condensed statement of financial condition are valued using quoted market prices.  These investments may include investments in restricted common stock, which would be valued using discounts from quoted market prices and,  therefore, would be reported as Level 2 financial instruments.

Earnings Per Share

Earnings Per Share

Earnings per share (“EPS”) are computed in accordance with ASC 260, Earnings per Share.  Shares of Class A and Class B common stock share proportionately in the earnings of IBG, Inc.  Basic earnings per share are calculated utilizing net income available for common stockholders divided by the weighted average number of shares of Class A and Class B common stock outstanding for that period.  Diluted earnings per share are calculated utilizing the Company’s basic net income available for common stockholders divided by diluted weighted average shares outstanding with no adjustments to net income available to common stockholders for dilutive potential common shares.

Stock-Based Compensation

Stock-Based Compensation

IBG, Inc. follows ASC 718, Compensation – Stock Compensation, to account for its stock-based compensation plans.  ASC 718 requires all share-based payments to employees to be recognized in the financial statements using a fair value-based method.  As a result, IBG, Inc. expenses the fair value of stock granted to employees over the related vesting period.

Cash and Cash Equivalents

Cash and Cash Equivalents

IBG, Inc. defines cash equivalents as short-term, highly liquid securities and cash deposits with original maturities of three months or less, other than those used for trading purposes.

Cash and Securities - Segregated for Regulatory Purposes

Cash and Securities — Segregated for Regulatory Purposes

As a result of customer activities, certain Operating Companies are obligated by rules mandated by their primary regulators to segregate or set aside cash or qualified securities to satisfy such regulations, which regulations have been promulgated to protect customer assets.  In addition, substantially all of the Operating Companies are members of various clearing organizations at which cash or securities are deposited as required to conduct day-to-day clearance activities.  Securities segregated for regulatory purposes consisted of Federal Deposit Insurance Corporation insured corporate bonds, which are recorded as Level 2 financial assets, in the amount of $440,471 and $440,773 at June 30, 2011 and December 31, 2010, U.S. Treasury Bills of $397,694 and $146,976 at June 30, 2011 and December 31, 2010, which are recorded as Level 1 financial assets and securities purchased under agreements to resell in the amount of $2,595,592 and $2,391,813 as of June 30, 2011 and December 31, 2010, respectively, which amounts approximate fair value.

Securities Borrowed and Securities Loaned

Securities Borrowed and Securities Loaned

Securities borrowed and securities loaned are recorded at the amount of cash collateral advanced or received.  Securities borrowed transactions require IBG, Inc. to provide counterparties with collateral, which may be in the form of cash, letters of credit, or other securities.  With respect to securities loaned, IBG, Inc. receives collateral, which may be in the form of cash or other securities in an amount generally in excess of the fair value of the securities loaned.

IBG, Inc. monitors the market value of securities borrowed and loaned on a daily basis, with additional collateral obtained or refunded as permitted contractually.  Receivables and payables with the same counterparty are not offset in the unaudited condensed consolidated statements of financial condition.  For these transactions, the fees received or paid by IBG, Inc. are recorded as interest income or interest expense in the unaudited condensed consolidated statements of comprehensive income.

Securities Purchased Under Agreements to Resell

Securities Purchased Under Agreements to Resell

Securities purchased under agreements to resell are treated as collateralized financing transactions and are recorded at contract value, plus accrued interest, which approximates fair value. The Company’s policy is to obtain possession of collateral with a fair value equal to or in excess of the principal amount loaned under resale agreements.  To ensure that the fair value of the underlying collateral remains sufficient, this collateral is valued daily with additional collateral obtained or excess collateral returned, as permitted under contractual provisions.

Financial Instruments Owned and Sold But Not Yet Purchased

Financial Instruments Owned and Sold But Not Yet Purchased

Stocks, government, corporate and municipal bonds, futures and options transactions are reported in the unaudited condensed consolidated financial statements on a trade date basis.  All financial instruments owned and financial instruments sold but not yet purchased are recorded at fair value based upon quoted market prices.  All firm-owned financial instruments pledged to counterparties where the counterparty has the right, by contract or custom, to sell or repledge the financial instruments are classified as financial instruments owned and pledged as collateral in the unaudited condensed consolidated statements of financial condition.

IBG, Inc. also enters into currency forward contracts.  These transactions, which are also reported on a trade date basis, are agreements to exchange a fixed amount of one currency for a specified amount of a second currency at completion of the currency forward contract term.  Unrealized mark-to-market gains and losses on currency forward contracts are reported as components of financial instruments owned or financial instruments sold but not yet purchased in the unaudited condensed consolidated statements of financial condition.  Net earnings or losses are reported as components of interest income in the unaudited condensed consolidated statements of comprehensive income.

Customer Receivables and Payables

Customer Receivables and Payables

Customer securities transactions are recorded on a settlement date basis and customer commodities transactions are recorded on a trade date basis.  Receivables from and payables to customers include amounts due on cash and margin transactions, including futures contracts transacted on behalf of customers.  Securities owned by customers, including those that collateralize margin loans or other similar transactions, are not reported in the unaudited condensed consolidated statements of financial condition.  Amounts receivable from customers that are determined by management to be uncollectible are written off to general and administrative expense.

Receivables from and Payables to Brokers, Dealers and Clearing Organizations

Receivables from and Payables to Brokers, Dealers and Clearing Organizations

Receivables from brokers, dealers and clearing organizations include amounts receivable for securities not delivered by IBG, Inc. to the purchaser by the settlement date (“fails to deliver”) and margin deposits.  Payables to brokers, dealers and clearing organizations include amounts payable for securities not received by IBG, Inc. from a seller by the settlement date (“fails to receive”).  Receivables and payables to brokers, dealers and clearing organizations also include amounts related to futures contracts executed on behalf of customers as well as net payables and receivables from unsettled trades.

Investments

Investments

IBG, Inc. makes certain strategic investments and accounts for these investments under the cost method of accounting or under the equity method of accounting as required under ASC 323, Investments – Equity Method and Joint Ventures.  Investments are accounted for under the equity method of accounting, when IBG, Inc. has significant influence over the investee.  Investments accounted for under the equity method, including where the investee is a limited partnership or limited liability company, are recorded at the fair value amount of IBG, Inc.’s investment and adjusted each period for IBG, Inc.’s share of the investee’s income or loss.  IBG, Inc.’s share of the income or losses from equity investments is reported as a component of other income in the unaudited condensed consolidated statements of comprehensive income and the recorded amounts of IBG, Inc.’s equity investments, which are included in other assets in the unaudited condensed consolidated statements of financial condition, increase or decrease accordingly.  Distributions received from equity investees are recorded as reductions to the respective investment balance.

A judgmental aspect of accounting for investments is evaluating whether an other-than-temporary decline in the value of an investment has occurred.  The evaluation of an other-than-temporary impairment is dependent on specific quantitative and qualitative factors and circumstances surrounding an investment, including recurring operating losses, credit defaults and subsequent rounds of financing.  None of IBG, Inc.’s equity investments have readily determinable market values.  All equity investments are reviewed for changes in circumstances or occurrence of events that suggest IBG, Inc.’s investment may not be recoverable.  If an unrealized loss on any investment is considered to be other-than-temporary, the loss is recognized in the period the determination is made.  IBG, Inc. also holds exchange memberships and investments in equity securities of certain exchanges as required to qualify as a clearing member, and strategic investments in corporate stock that do not qualify for equity method accounting.  Such investments are recorded at cost or, if an other-than-temporary impairment in value has occurred, at a value that reflects management’s estimate of the impairment, and are included in other assets in the unaudited condensed consolidated statements of financial condition.  Dividends are recognized as a component of other income as such dividends are received.

Property and Equipment

Property and Equipment

Property and equipment, which is a component of other assets, consist of purchased technology hardware and software, internally developed software, leasehold improvements and office furniture and equipment.  Property and equipment are recorded at historical cost, less accumulated depreciation and amortization.  Additions and improvements that extend the lives of assets are capitalized, while expenditures for repairs and maintenance are expensed as incurred.  Depreciation and amortization are computed using the straight-line method.  Equipment is depreciated over the estimated useful lives of the assets, while leasehold improvements are amortized over the lesser of the estimated economic useful life of the asset or the term of the lease.  Computer equipment is depreciated over three to five years and office furniture and equipment are depreciated over five to seven years.  Qualifying costs for internally developed software are capitalized and amortized over the expected useful life of the developed software, not to exceed three years.

Comprehensive Income and Foreign Currency Translation

Comprehensive Income and Foreign Currency Translation

Comprehensive income consists of two components: net income and other comprehensive income.  Other comprehensive income refers to revenues, expenses, gains and losses that are included in stockholders’ equity but are excluded from net income.  IBG, Inc.’s other comprehensive income is comprised of foreign currency translation adjustments.

IBG, Inc.’s international Operating Companies have a functional currency (i.e., the currency in which activities are primarily conducted) that is other than the U.S. dollar.  Such subsidiaries’ assets and liabilities are translated into U.S. dollars at period-end exchange rates, and revenues and expenses are translated at average exchange rates prevailing during the period.  Translation gains and losses from market making and electronic brokerage activities, respectively, are included in trading gains and in other income in the accompanying unaudited condensed consolidated statements of comprehensive income.  Adjustments that result from translating amounts from a subsidiary’s functional currency are reported as a component of accumulated other comprehensive income.

Revenue Recognition

Revenue Recognition

— Trading Gains

Trading gains and losses are recorded on trade date and are reported on a net basis.  Trading gains are comprised of changes in the fair value of trading assets and liabilities (i.e., unrealized gains and losses) and realized gains and losses.  Dividends are integral to the valuation of stocks and interest is integral to the valuation of fixed income instruments.  Accordingly, both dividends and interest income and expense attributable to specific trading assets and liabilities are reported on a net basis as a component of trading gains in the accompanying unaudited condensed consolidated statements of comprehensive income.

— Commissions and Execution Fees

Commissions charged for executing and clearing customer transactions are accrued on a trade date basis and are reported as commissions and execution fees in the unaudited condensed consolidated statements of comprehensive income, and the related expenses are reported as execution and clearing expenses, also on a trade date basis.

— Interest Income and Expense

The Company earns interest income and incurs interest expense primarily in connection with its Electronic Brokerage customer business and its securities lending activities.  Such interest is recorded on the accrual basis.

Income Taxes

Income Taxes

IBG, Inc. accounts for income taxes in accordance with ASC 740, Income Taxes, which requires the recognition of tax benefits or expenses on the temporary differences between the financial reporting and tax bases of assets and liabilities, including the accounting for uncertainty of income tax positions and valuation allowances for deferred tax assets reported in financial statements, prescribing a “more likely than not” threshold and measurement attribute for recognition in the financial statements of an asset or liability resulting from a tax position taken or expected to be taken in an income tax return.

The Company’s provision for income taxes is comprised of two principal components: (1) the Group’s consolidated income tax expense, and (2) the Company’s U.S. Federal and state income taxes on its proportionate share of the Group’s income that is subject to tax.

The Group has historically operated in the United States as a limited liability company that was treated as a partnership for U.S. federal income tax purposes.  Accordingly, the Group’s income, which is allocated proportionately to the Group’s members, the Company and IBG Holdings LLC, is not subject to U.S. federal income taxes at the Group level.  Taxes related to income earned by partnerships represent obligations of the individual partners.  Therefore, income taxes attributable to the Group and included in income tax expense in the Company’s unaudited condensed consolidated statements of comprehensive income are primarily incurred in non-U.S. subsidiaries.  Outside the United States, the Group principally operates through subsidiary corporations and is subject to local income taxes.  In addition, state and local income taxes include taxes assessed on the Group by jurisdictions that do not recognize the Group’s limited liability company status.  Foreign income taxes paid by the Group on dividends received are also reported as income taxes.

IBG, Inc. recognizes interest related to income tax matters as interest income or expense and penalties related to income tax matters as income tax expense.

Recently Issued Accounting Pronouncements

Recently Issued Accounting Pronouncements

Subsequent to the adoption of the ASC, the FASB will issue Accounting Standards Updates (“ASU’s”) as the means to add to or delete from, or otherwise amend the ASC.  In 2011, prior to the issuance of the Company’s unaudited condensed consolidated financial statements, ASU’s 2011-01 through ASU 2011-07 were issued.  Following is a summary of recently issued ASU’s that may affect the Company’s condensed consolidated financial statements:

	Affects	Status
ASU 2010-13	Compensation - Stock Compensation (Topic 718) - Effect of Denominating the Exercise Price of a Share-Based Payment Award in the Currency of the Market in Which the Underlying Equity Security Trades	Fiscal years, and interim periods within those fiscal years, beginning after December 15, 2010.  Early application is permitted.
ASU 2011-01	Receivables (Topic 310) - Deferral of the Effective Date of Disclosures about Troubled Debt Restructurings in Update No. 2010-20	Effective on issuance.
ASU 2011-02	Receivables (Topic 310) - A Creditor's Determination of Whether a Restructuring is a Troubled Debt Restructuring	First interim or annual period beginning after June 15, 2011, to be applied retrospectively to the beginning of the annual period of adoption.  Early adoption is permitted.
ASU 2011-03	Transfers and Servicing (Topic 860) - Reconsideration of Effective Control for Repurchase Agreements	Fiscal years, and interim periods within those fiscal years, beginning after December 15, 2011.  Early application is not permitted.
ASU 2011-04	Fair Value Measurement (Topic 820) - Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and IFRS	To be applied prospectively for interim and annual periods beginning after December 15, 2011.  Early adoption is not permitted for public entities.
ASU 2011-05	Comprehensive Income (Topic 220) - Presentation of Comprehensive Income	To be applied retrospectively, with reporting to commence in fiscal years beginning after December 15, 2011.  Early adoption is permitted.

Adoption of those ASU’s that became effective during 2011, prior to the issuance of the Company’s unaudited condensed consolidated financial statements, did not have a material effect on those financial statements.  Other than ASU 2011-05, which the Company adopted early, as permitted, for the quarter ended June 30, 2011, management is assessing the potential impact on the Company’s financial statements of adopting ASU’s that will become effective in the future.

ASC/IFRS Convergence

ASC/IFRS Convergence

In February 2010, the SEC issued “Commission Statement in Support of Convergence and Global Accounting Standards”, a formal statement updating the status of its November 2008 “Roadmap for the Potential Use of Financial Statements Prepared in Accordance with International Financial Reporting Standards by U.S. Issuers” (“IFRS Roadmap”).  The statement supported convergence of accounting standards and the development of a single set of global accounting standards.  As directed in this statement, the SEC staff issued “Work Plan for the Consideration of Incorporating International Financial Reporting Standards into the Financial Reporting System for U.S. Issuers” (the “Work Plan”) in May 2010, and issued a follow-up Staff Paper, subtitled “Exploring a Possible Method of Incorporation” in May 2011.  The Work Plan outlines the steps to be taken to provide the SEC with information to be able to conclude whether IFRS should be adopted for U.S. registrants and the Staff Paper discusses alternative approaches (“Convergence” and “Endorsement”) to adoption that could be applied.  Within the Staff Paper, the SEC Staff has issued a Request for Comment on these alternatives.  The Comment period ended July 31, 2011 and the SEC Staff have not issued further reporting to date.  Neither the February statement, the Work Plan nor the Staff Paper define a certain date for adoption of IFRS. A decision on whether the SEC will mandate adoption of IFRS, in full or in part, may be made in 2011.  If a decision to adopt IFRS is made at that point in time, initial adoption for U.S. registrants would be approximately December 31, 2015 or 2016, with a transition date of either January 1, 2013 or 2014 for the initial three year retrospective comparative reporting period.  Management continues to assess the potential impact of adopting IFRS on the Company’s unaudited condensed consolidated financial statements.

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Defined Contribution And Employee Incentive Plan Stock Plan Activity (Detail)	6 Months Ended
	Jun. 30, 2011
2007 Stock Incentive Plan (Shares)
Statement line items stock plan activity
Balance	7,263,140
Granted	0
Forfeited	(44,257)
Distributed	(1,164,831)
Balance	6,054,052
2007 ROI Unit Stock Plan (Shares)
Statement line items stock plan activity
Balance	544,613
Granted	0
Forfeited	(51)
Distributed	(185,478)
Balance	359,084

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Comprehensive Income (Tables)

6 Months Ended

Jun. 30, 2011

Notes to Consolidated Financial Statements

Comprehensive Income Table

		Three months ended					Six months ended
		June 30,					June 30,
		2011		2010			2011		2010
Net income available for common stockholders		$	9,561	$	3,840		$	25,812	$	7,731
Other comprehensive income:
	Cumulative translation adjustment, before income taxes		6,067		(5,785	)		8,072		(7,992	)
	Income taxes related to items of other comprehensive income		2,230		(2,126	)		2,967		(2,937	)
Other comprehensive income (loss), net of tax			3,837		(3,659	)		5,105		(5,055	)
Comprehensive income available for common stockholders		$	13,398	$	181		$	30,917	$	2,676
Earnings per share on comprehensive income:
	Basic	$	0.311	$	0.004		$	0.725	$	0.064
	Diluted	$	0.308	$	0.004		$	0.717	$	0.063
Weighted average common shares outstanding:
	Basic		43,018,095		41,802,541			42,627,045		41,511,328
	Diluted		43,470,928		42,441,995			43,133,155		42,206,384

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Organization and Nature Of Business

6 Months Ended

Jun. 30, 2011

Notes to Consolidated Financial Statements

Organization and nature of business

1.   Organization and Nature of Business

Interactive Brokers Group, Inc. ("IBG, Inc." or the "Company") is a Delaware holding company whose primary asset is its ownership of approximately 11.0% of the membership interests of IBG LLC, which, in turn, owns operating subsidiaries (collectively, "IBG LLC" or the "Group").  The accompanying unaudited condensed consolidated financial statements of IBG, Inc. reflect the consolidation of IBG, Inc.’s investment in IBG LLC for all periods presented (Note 4).  IBG LLC is an automated global electronic broker and market maker specializing in routing orders and processing trades in securities, futures and foreign exchange instruments.

IBG LLC is a Connecticut limited liability company that conducts its business through its operating subsidiaries (collectively called the “Operating Companies”):  Timber Hill LLC (“TH LLC”), Timber Hill Specialists Corp. (“THSC”), Timber Hill Europe AG (“THE”), Timber Hill Securities Hong Kong Limited (“THSHK”), Timber Hill Australia Pty Limited (“THA”), Timber Hill Canada Company (“THC”), Interactive Brokers LLC (“IB LLC”) and subsidiaries, Interactive Brokers Canada Inc. (“IBC”), Interactive Brokers (U.K.) Limited (“IBUK”), Interactive Brokers (India) Private Limited (“IBI”), Interactive Brokers Financial Products S.A. (“IBFP”), Interactive Brokers Hungary KFT (“IBH”), IB Exchange Corp. (“IBEC”), Interactive Brokers Securities Japan, Inc. (“IBSJ”), Interactive Brokers Software Services Estonia OU (“IBEST”) and Interactive Brokers Software Services Russia (“IBRUS”).

IBG, Inc. operates in two business segments, electronic brokerage and market making.  IBG, Inc. conducts its electronic brokerage business through its Interactive Brokers subsidiaries, which provide electronic execution and clearing services to customers worldwide. The Company conducts its market making business principally through its Timber Hill subsidiaries on the world’s leading exchanges and market centers, primarily in exchange-traded equities, equity options and equity-index options and futures.

Certain of the Operating Companies are members of various securities and commodities exchanges in North America, Europe and the Asia/Pacific region.  Other than IB LLC, IBUK, IBC, IBI and IBSJ, the Operating Companies do not carry securities accounts for customers or perform custodial functions relating to customer securities.

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Defined Contribution and Employee Incentive Plans

6 Months Ended

Jun. 30, 2011

Notes to Consolidated Financial Statements

Employee Incentive Plans

10.   Employee Incentive Plans

Return on Investment Dollar Units (“ROI Dollar Units”)

From 1998 through January 1, 2006, IBG LLC granted all non-member employees ROI Dollar Units, which are redeemable under the amended provisions of the plan, and in accordance with regulations issued by the Internal Revenue Service (Section 409A of the Internal Revenue Code).  Upon redemption, the grantee is entitled to accumulated earnings on the face value of the certificate, but not the actual face value.  For grants made in 1998 and 1999, grantees may redeem the ROI Dollar Units after vesting on the fifth anniversary of the date of their grant and prior to the tenth anniversary of the date of their grant.  For grants made between January 1, 2000 and January 1, 2005, grantees must elect to redeem the ROI Dollar Units upon the fifth, seventh or tenth anniversary date.  These ROI Dollar Units will vest upon the fifth anniversary of the date of their grant and will continue to accumulate earnings until the elected redemption date.  For grants made on or after January 1, 2006, all ROI Dollar Units shall vest on the fifth anniversary date of their grant and will be automatically redeemed.  Subsequent to the IPO, no additional ROI Dollar Units have been or will be granted, and non-cash compensation to employees will consist primarily of grants of shares of Common Stock as described below under “2007 Stock Incentive Plan.”

As of June 30, 2011 and December 31, 2010, payables to employees for ROI Dollar Units were $9,518 and $15,415, respectively.  Of these payable amounts, $-0- and $4,613 were vested as of June 30, 2011 and December 31, 2010, respectively.  These amounts are included in accounts payable, accrued expenses and other liabilities in the unaudited condensed consolidated statements of financial condition.  Compensation expense for the ROI Dollar Unit plan, included in the unaudited condensed consolidated statements of comprehensive income was $928 and $208 for the six months ended June 30, 2011 and 2010, respectively.

2007 ROI Unit Stock Plan

In connection with the IPO, IBG, Inc. adopted the Interactive Brokers Group, Inc. 2007 ROI Unit Stock Plan (the “ROI Unit Stock Plan”).  Under this plan, certain employees of the Group who held ROI Dollar Units, at the employee’s option, elected to invest their ROI Dollar Unit accumulated earnings as of December 31, 2006 in shares of Common Stock.  An aggregate of 1,271,009 shares of Common Stock (consisting of 1,250,000 shares issued under the ROI Unit Stock Plan and 21,009 shares under the 2007 Stock Incentive Plan, as described below), with a fair value at the date of grant of $38,143, were issued to IBG LLC, to be held as Treasury stock, to be distributed to employees in accordance with the following schedule, subject to the conditions below:

· 10% on the date of the IPO (or on the first anniversary of the IPO, in the case of U.S. ROI Unit holders who made the above-referenced elections after December 31, 2006); and

· an additional 15% on each of the first six anniversaries of the date of the IPO, assuming continued employment with IBG, Inc. and compliance with other applicable covenants.

Of the fair value at the date of grant, $17,806 represented the accumulated ROI Dollar Unit value elected to be invested by employees in Common Stock and such amount was accrued for as of December 31, 2006.  The remainder is being ratably accrued as compensation expense by the Company from the date of the IPO over the requisite service period represented by the aforementioned distribution schedule.  Compensation expense for the 2007 ROI Unit Stock Plan and related grants under the 2007 Stock Incentive Plan, net of the effect of forfeitures, included in the unaudited condensed consolidated statements of comprehensive income for the six months ended June 30, 2011 and 2010 was $2,163 and $1,671, respectively.  Estimated future compensation costs for unvested awards at June 30, 2011 are $7.6 million.

2007 Stock Incentive Plan

Under the Interactive Brokers Group, Inc. 2007 Stock Incentive Plan (the “Stock Incentive Plan” or “SIP”), up to 20.0 million shares of Common Stock may be granted and issued to directors, officers, employees, contractors and consultants of IBG, Inc. and its subsidiaries.  A 10.8 million share increase in shares allocated to the SIP, first reported in the Company’s Annual Report on Form 10-K for the year ended December 31, 2010, was approved by the Company’s Compensation Committee and Board of Directors in December 2010, and was approved by stockholders at the Company’s April 2011 annual meeting.  The purpose of the Stock Incentive Plan is to promote IBG, Inc.’s long-term financial success by attracting, retaining and rewarding eligible participants.

The Stock Incentive Plan is administered by the Compensation Committee of IBG, Inc.’s Board of Directors.  The Compensation Committee has discretionary authority to determine which employees are eligible to participate in the Stock Incentive Plan and establishes the terms and conditions of the awards, including the number of awards granted to each employee and all other terms and conditions applicable to such awards in individual grant agreements.  Awards are expected to be made primarily through grants of Common Stock.  Stock Incentive Plan awards are subject to issuance over time and may be forfeited upon an employee’s termination of employment or violation of certain applicable covenants prior to issuance, unless determined otherwise by the Compensation Committee.

The Stock Incentive Plan provides that, upon a change in control, the Compensation Committee may, at its discretion, fully vest any granted but unissued shares of Common Stock awarded under the Stock Incentive Plan, or provide that any such granted but unissued shares of Common Stock will be honored or assumed, or new rights substituted therefore by the new employer on a substantially similar basis and on terms and conditions substantially comparable to those of the Stock Incentive Plan.

IBG, Inc. granted awards of Common Stock in connection with the IPO and is expected to continue to grant awards on or about December 31 of each year following the IPO, to eligible employees as part of an overall plan of equity compensation.  Shares of Common Stock granted are issued to IBG LLC, to be held as Treasury Stock, and are distributable to employees in accordance with the following schedule:

· 10% on the first vesting date, which approximates the anniversary of the IPO; and

· an additional 15% on each of the following six anniversaries of the first vesting, assuming continued employment with IBG, Inc. and compliance with non-competition and other applicable covenants.

Shares granted to directors vest, and are distributed, over a five-year period (20% per year) commencing one year after the date of grant.

Stock Incentive Plan share grants (excluding 21,009 shares issued pursuant to the 2007 ROI Unit Stock Plan above) and the related fair values at the date of grant were:

			Fair Value at
			Date of Grant
	Shares		($000's)
In connection with IPO	927,943	$	27,847
July 31, 2007	16,665		404
December 31, 2007	1,055,206		32,876
December 31, 2008	2,065,432		35,600
December 31, 2009	2,448,031		42,796
December 31, 2010	2,513,738		43,255
	9,027,015	$	182,778

Total share distributions under the SIP and ROI Unit Stock Plan have been as follows:

				Shares sold by
				employees to
			Fair Value at	meet
			Date of Grant	withholding
	Total Shares		($000's)	obligations
In connection with IPO	189,617	$	5,681	45,857
2008	458,655		13,881	121,852
2009	680,164		17,898	175,362
2010	1,014,772		23,742	265,971
2011	1,350,309		29,405	370,310

The following is a summary of Stock Plan activity for the period from January 1, 2011 through June 30, 2011:

	Shares
	2007 Stock		2007 ROI Unit
	Incentive Plan		Stock Plan
Balance, December 31, 2010	7,263,140		544,613
Granted	-		-
Forfeited	(44,257	)	(51	)
Distributed	(1,164,831	)	(185,478	)
Balance, June 30, 2011	6,054,052		359,084

Estimated future grants under the Stock Incentive Plan are being accrued for ratably during each year under the ASC 718 “Graded Vesting” method.  Compensation expense recognized in the unaudited condensed consolidated statements of comprehensive income for the six months ended June 30, 2011 and 2010, was $19,147 and $18,496, respectively.  Estimated future compensation costs for unvested awards at June 30, 2011 are $53.6 million.

Shares granted under the 2007 ROI Unit Stock Plan and the Stock Incentive Plan are subject to forfeiture in the event an employee ceases employment with the Company.  The plans provide that employees who discontinue employment with the Company without cause and continue to meet the terms of the plans’ post-employment provisions will forfeit 50% of unvested previously granted shares unless the employee is over the age of 59, in which case the employee would be eligible to receive 100% of unvested shares previously granted.  Distributions of remaining shares to former employees will occur annually following the discontinuation of employment over a five (5) year vesting schedule, 12.5% in each of the first four years and 50% in the fifth year.  Through June 30, 2011, a total of 11,050 shares have been distributed under these post-employment provisions.  These distributions are included in the Stock Plans activity tables above.

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Equity and Earnings Per Share Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended	6 Months Ended		50 Months Ended
	Nov. 28, 2008	Jun. 30, 2011	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Aug. 04, 2011	Dec. 31, 2010	Sep. 26, 2008	May 03, 2007
Equity and earnings per share
IBG Inc. ownership % of IBG LLC		11.00%	11.00%		11.00%	11.50%			10.00%
Class B ownership % of IBG LLC		89.00%	89.00%		89.00%				90.00%
IBG Holdings Redemption of IBG LLC									10.00%
IBG Holdings LLC Owernship Percentage of Class B Common Stock									100.00%
Exchange Agreement Future Redemption Schedule					12.5% annually for seven (7) years and 2.5% in the eighth year.
Shares reserved for future issuance									360,000,000
Thomas Peterffy and Affiliates Ownership		85.80%	85.80%		85.80%				84.60%
Preferred stock shares authorized		10,000	10,000		10,000
Preferred stock shares issued		0	0		0		0
Preferred stock shares outstanding		0	0		0		0
Deferred tax asset		$ 302,957,000	$ 302,957,000		$ 302,957,000		$ 313,526,000		$ 380,785,000
Percent of Tax Savings Owed to IBG Holdings LLC		85.00%	85.00%		85.00%
Tax savings owed to IBG Holdings LLC									323,668,000
Percentage of tax savings not payable to IBG Holdings LLC									15.00%
Balance of tax savings not payable to IBG Holdings LLC									57,117,000
Deferred Tax Asset paid to IBG Holdings LLC					38,800,000
Class A common stock authorized to be repurchased (shares)								8,000,000
Treasury stock shares acquired	65,800
Treasury stock acquired cost	866,000
Dividends Paid		81,000,000
Cash dividend paid to IBG, Inc.		10,100,000
Dividend per share		$ 0.10
Dividends paid to common shareholders		4,358,000	4,358,000	0
Dividends Paid to Unvested Class A Shareholders		$ 600,000
Common Class A
Equity and earnings per share
Common stock, par value		$ 0.01	$ 0.01		$ 0.01		$ 0.01
Shares authorized		1,000,000,000	1,000,000,000		1,000,000,000		1,000,000,000
Shares issued		50,298,024	50,298,024		50,298,024		50,298,024
Common stock, shares outstanding		43,581,860	43,581,860		43,581,860		42,231,551
Common Class B
Equity and earnings per share
Common stock, par value		$ 0.01	$ 0.01		$ 0.01		$ 0.01
Shares authorized		100	100		100		100
Shares issued		100	100		100		100
Common stock, shares outstanding		100	100		100		100

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Related Party Transactions

6 Months Ended

Jun. 30, 2011

Notes to Consolidated Financial Statements

Related Party Transactions

14.   Related Party Transactions

Receivable from affiliate represents amounts advanced to IBG Holdings LLC and payable to affiliate represents amounts payable to IBG Holdings LLC under the Tax Receivable Agreement (Note 4).

Included in receivable from and payable to customers in the accompanying unaudited condensed consolidated statements of financial condition as of June 30, 2011 and December 31, 2010 were account receivables of directors, officers and their affiliates of $1,778 and $41 and payables of $628,654 and $748,460, respectively.  Included in senior notes payable at June 30, 2011 and December 31, 2010 were senior notes purchased by directors and their affiliates of $8,060 and $10,443, respectively.

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Condensed Consolidated Statements of Financial Condition (Unaudited) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Assets
Cash and cash equivalents	$ 1,422,935	$ 1,354,219
Cash and securities - segregated for regulatory purposes	8,807,874	7,888,093
Securities borrowed	3,215,552	3,292,345
Securities purchased under agreements to resell	304,278	336,299
Trading assets, at fair value:
Financial instruments owned	4,125,305	5,420,929
Financial instruments owned and pledged as collateral	1,978,158	2,001,488
Total trading assets, at fair value	6,103,463	7,422,417
Other receivables:
Customers, less allowance for doubtful accounts of $20,746 and $17,871 at June 30, 2011 and December 31, 2010	9,320,028	6,973,033
Receivables from brokers, dealers and clearing organizations	947,365	732,869
Receivable from affiliate	581	1,185
Interest receivable	22,774	18,502
Total other receivables	10,290,748	7,725,589
Other assets	495,405	479,806
Total assets	30,640,255	28,498,768
Liabilities and equity
Financial instruments sold but not yet purchased, at fair value	4,939,976	6,125,224
Securities loaned	1,757,467	1,659,611
Short-term borrowings	42,964	187,380
Other payables:
Customers	18,158,887	15,060,479
Payables to brokers, dealers and clearing organizations	283,370	248,685
Payable to affiliate	284,862	284,860
Accounts payable, accrued expenses and other liabilities	399,779	409,757
Interest payable	9,107	7,682
Total other payables	19,136,005	16,011,463
Senior notes payable	178,300	194,603
Senior secured credit facility	0	100,000
Total liabilities	26,054,712	24,278,281
Stockholders' equity:
Additional paid-in capital	522,434	535,630
Retained earnings	113,958	92,504
Accumulated other comprehensive income, net of income taxes of $15,521 and $12,284 at June 30, 2011 and December 31, 2010	26,242	21,137
Treasury stock, at cost, 6,716,164 and 8,066,473 shares at June 30, 2011 and December 31, 2010	(132,542)	(161,947)
Total stockholders' equity	530,595	487,827
Non-controlling interests	4,054,948	3,732,660
Total equity	4,585,543	4,220,487
Total liabilities and equity	30,640,255	28,498,768
Common Class A
Stockholders' equity:
Common stock	503	503
Common Class B
Stockholders' equity:
Common stock	$ 0	$ 0

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Fair Value (Detail) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Securities segregated for regulatory purposes	$ 838,165	$ 587,749
Financial instruments owned	4,125,305	5,420,929
Financial instruments owned and pledged as collateral	1,978,158	2,001,488
Total trading assets, at fair value	6,103,463	7,422,417
Other assets - investments in common stock	22,892	2,239
Total financial assets, at fair value	6,964,520	8,012,405
Financial instruments sold but not yet purchased, at fair value	4,939,976	6,125,224
Level 1
Securities segregated for regulatory purposes	397,694	146,976
Financial instruments owned	4,073,203	5,371,820
Financial instruments owned and pledged as collateral	1,978,158	2,001,488
Total trading assets, at fair value	6,051,361	7,373,308
Other assets - investments in common stock	22,892	0
Total financial assets, at fair value	6,471,947	7,520,284
Financial instruments sold but not yet purchased, at fair value	4,888,078	6,070,552
Level 1 | Common Stock
Financial instruments owned	621,422	1,318,003
Financial instruments owned and pledged as collateral	1,676,779	1,633,383
Financial instruments sold but not yet purchased, at fair value	1,777,331	2,256,259
Level 1 | Options
Financial instruments owned	3,277,354	3,893,695
Financial instruments sold but not yet purchased, at fair value	3,057,013	3,765,862
Level 1 | U.S. and Foreign Government Obligations
Financial instruments owned	15,610	8,408
Financial instruments owned and pledged as collateral	301,379	368,105
Financial instruments sold but not yet purchased, at fair value	53	0
Level 1 | Warrants
Financial instruments owned	56,948	85,740
Financial instruments sold but not yet purchased, at fair value	0	12
Level 1 | Corporate and municipal bonds
Financial instruments owned	51,503	47,757
Financial instruments sold but not yet purchased, at fair value	53,681	48,419
Level 1 | Discount certificates
Financial instruments owned	50,366	18,217
Level 2
Securities segregated for regulatory purposes	440,471	440,773
Financial instruments owned	52,102	49,109
Total trading assets, at fair value	52,102	49,109
Other assets - investments in common stock	0	2,239
Total financial assets, at fair value	492,573	492,121
Financial instruments sold but not yet purchased, at fair value	51,898	54,672
Level 2 | Corporate and municipal bonds
Financial instruments owned	51,428	48,895
Financial instruments sold but not yet purchased, at fair value	49,573	50,734
Level 2 | Currency forward contracts
Financial instruments owned	674	214
Financial instruments sold but not yet purchased, at fair value	2,325	3,938
Common Stock
Financial instruments owned	621,422	1,318,003
Financial instruments owned and pledged as collateral	1,676,779	1,633,383
Financial instruments sold but not yet purchased, at fair value	1,777,331	2,256,259
Options
Financial instruments owned	3,277,354	3,893,695
Financial instruments sold but not yet purchased, at fair value	3,057,013	3,765,862
U.S. and Foreign Government Obligations
Financial instruments owned	15,610	8,408
Financial instruments owned and pledged as collateral	301,379	368,105
Financial instruments sold but not yet purchased, at fair value	53	0
Warrants
Financial instruments owned	56,948	85,740
Financial instruments sold but not yet purchased, at fair value	0	12
Corporate and municipal bonds
Financial instruments owned	102,931	96,652
Financial instruments sold but not yet purchased, at fair value	103,254	99,153
Discount certificates
Financial instruments owned	50,366	18,217
Currency forward contracts
Financial instruments owned	674	214
Financial instruments sold but not yet purchased, at fair value	$ 2,325	$ 3,938

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Related Party Transactions (Detail) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Related Party
Due from Related Parties - Customers	$ 1,778	$ 41
Due to Related Parties - Customers	628,654	748,460
Senior notes payable - related parties	$ 8,060	$ 10,443

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Segment and Geographic Information Segment Table (Detail) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Segment
Net revenues	$ 296,940	$ 226,136	$ 664,828	$ 436,706
Income before income taxes	149,144	72,076	371,116	136,989
Segment Assets	30,640,255		30,640,255		28,498,768
Market making
Segment
Net revenues	125,726	81,644	328,064	164,425
Income before income taxes	59,186	3,889	193,852	9,345
Segment Assets	13,719,629		13,719,629		14,609,564
Electronic brokerage
Segment
Net revenues	169,715	144,581	333,375	271,773
Income before income taxes	88,973	72,324	179,059	136,696
Segment Assets	20,959,763		20,959,763		17,356,632
Corporate and eliminations
Segment
Net revenues	1,499	(89)	3,389	508
Income before income taxes	985	(4,137)	(1,795)	(9,052)
Segment Assets	$ (4,039,137)		$ (4,039,137)		$ (3,467,428)

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Segment and Geographic Information Geographic Table (Detail) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Geographic
Net revenues	$ 296,940	$ 226,136	$ 664,828	$ 436,706
Income before income taxes	149,144	72,076	371,116	136,989
United States
Geographic
Net revenues	252,693	181,837	510,301	343,932
Income before income taxes	161,134	90,184	337,582	164,128
International
Geographic
Net revenues	45,886	44,725	154,256	92,631
Income before income taxes	(9,958)	(13,606)	38,212	(17,707)
Geographic corporate and eliminations
Geographic
Net revenues	(1,639)	(426)	271	143
Income before income taxes	$ (2,032)	$ (4,502)	$ (4,678)	$ (9,432)

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Collateralized Transactions Additional Information (Detail) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Collateralized transactions [Abstract]
Securities received as collateral where the Company is permitted to sell or repledge	$ 19,000,000	$ 15,700,000
Securities received as collateral, amount repledged or resold	6,700,000	6,600,000
Securities loaned and agreements to resell	6,000,000	5,900,000
Customer margin securities	13,000,000	9,800,000
Customer margin loans outstanding	$ 9,300,000	$ 7,000,000