Exhibit 99.1

INTERACTIVE BROKERS GROUP ANNOUNCES 2Q2025 RESULTS

— — —

GAAP DILUTED EPS OF $0.51, ADJUSTED¹ EPS OF $0.51

GAAP NET REVENUES OF $1,480 MILLION, ADJUSTED NET REVENUES OF $1,480 MILLION

GREENWICH, CT, July 17, 2025 — Interactive Brokers Group, Inc. (Nasdaq: IBKR), an automated global electronic broker, announced results for the quarter ended June 30, 2025.

Reported and adjusted diluted earnings per share were both $0.51 for the current quarter. For the year-ago quarter, reported diluted earnings per share² were $0.41 and $0.44 as adjusted.

Reported and adjusted net revenues were both $1,480 million for the current quarter. For the year-ago quarter, reported net revenues were $1,230 million and $1,290 million as adjusted.

Reported and adjusted income before income taxes were both $1,104 million for the current quarter. For the year-ago quarter, reported income before income taxes was $880 million and $940 million as adjusted.

Financial Highlights

(All comparisons are to the year-ago quarter.)

•	Commission revenue increased 27% to 516 million on higher customer trading volumes. Customer trading volume in stocks, options and futures increased 31%, 24% and 18%, respectively.

•	Net interest income increased 9% to $860 million on higher average customer credit balances and securities lending activity. Net interest income includes an approximately $26 million one-time credit related to recovery of taxes withheld at source.

•	Other fees and services decreased 9% to $62 million, led by a decrease of $7 million in risk exposure fees, which was partially offset by a $2 million increase in FDIC sweep fees.

•

Execution, clearing and distribution fees increased 1% to $116 million, driven by a new FINRA Consolidated Audit Trail (“CAT”) fee initiated during the fourth quarter of 2024 and higher customer trading volumes in stocks, options and futures, mostly offset by greater capture of liquidity rebates from certain exchanges.

•	General and administrative expenses increased 17% to $61 million, driven primarily by an increase of $8 million in advertising expenses.

•	Pretax profit margin for the current quarter was 75% both as reported and as adjusted. For the year-ago quarter, pretax margin was 72% as reported and 73% as adjusted.

•	Total equity of $18.5 billion.

The Interactive Brokers Group, Inc. Board of Directors declared a quarterly cash dividend of $0.08 per share. This dividend is payable on September 12, 2025, to shareholders of record as of September 1, 2025.

¹ See the reconciliation of non-GAAP financial measures starting on page 10.

² Prior period share and per share amounts have been retroactively adjusted to reflect the four-for-one forward stock split, effected in the form of a stock dividend, on June 17, 2025.

Business Highlights

(All comparisons are to the year-ago quarter.)

•	Customer accounts increased 32% to 3.87 million.

•	Customer equity increased 34% to $664.6 billion.

•	Total DARTs³ increased 49% to 3.55 million.

•	Customer credits increased 34% to $143.7 billion.

•	Customer margin loans increased 18% to $65.1 billion.

Other Items

Other income increased $78 million to a gain of $42 million. This gain mainly comprised (1) the non-recurrence of a loss of approximately $48 million on positions taken over as a customer accommodation due to a technical issue at the New York Stock Exchange that occurred on the morning of June 3, 2024; (2) $17 million related to our principal trading and investing activities; and (3) $15 million related to our currency diversification strategy.

In connection with our currency diversification strategy, we base our net worth in GLOBALs, a basket of 10 major currencies in which we hold our equity. In this quarter, our currency diversification strategy increased our comprehensive earnings by $301 million, as the U.S. dollar value of the GLOBAL increased by approximately 1.62%. The effects of the currency diversification strategy are reported as components of (1) Other Income (loss of $5 million) and (2) Other Comprehensive Income (gain of $306 million).

Conference Call Information:

Interactive Brokers Group, Inc. will hold a conference call with investors today, July 17, 2025, at 4:30 p.m. ET to discuss its quarterly results. Members of the public who would like to listen to the conference call should register at https://register-conf.media-server.com/register/BI1980d5d059964abab3dd6c86da65d04e to obtain the dial-in details. The number should be dialed approximately ten minutes prior to the start of the conference call. The conference call will also be accessible simultaneously, and through replays, as an audio webcast through the Investor Relations section of the Interactive Brokers web site, www.interactivebrokers.com/ir.

About Interactive Brokers Group, Inc.:

Interactive Brokers Group affiliates provide automated trade execution and custody of securities, commodities, foreign exchange, and forecast contracts around the clock on over 160 markets in numerous countries and currencies from a single unified platform to clients worldwide. We serve individual investors, hedge funds, proprietary trading groups, financial advisors and introducing brokers. Our four decades of focus on technology and automation have enabled us to equip our clients with a uniquely sophisticated platform to manage their investment portfolios. We strive to provide our clients with advantageous execution prices and trading, risk and portfolio management tools, research facilities and investment products, all at low or no cost, positioning them to achieve superior returns on investments. Interactive Brokers has consistently earned recognition as a top broker, garnering multiple awards and accolades from respected industry sources such as Barron's, Investopedia, Stockbrokers.com, and many others.

³ Daily average revenue trades (DARTs) are based on customer orders.

Cautionary Note Regarding Forward-Looking Statements:

The foregoing information contains certain forward-looking statements that reflect the Company’s current views with respect to certain current and future events and financial performance. These forward-looking statements are and will be, as the case may be, subject to many risks, uncertainties and factors relating to the Company’s operations and business environment which may cause the Company’s actual results to be materially different from any future results, expressed or implied, in these forward-looking statements. Any forward-looking statements in this release are based upon information available to the Company on the date of this release. The Company does not undertake to publicly update or revise its forward-looking statements even if experience or future changes make it clear that any statements expressed or implied therein will not be realized. Additional information on risk factors that could potentially affect the Company’s financial results may be found in the Company’s filings with the Securities and Exchange Commission.

For Interactive Brokers Group, Inc. Investors: Nancy Stuebe, investor-relations@ibkr.com or Media: Rob Garfield, media@ibkr.com.

INTERACTIVE BROKERS GROUP, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF INCOME

(UNAUDITED)

			Three Months				Six Months
			Ended June 30,				Ended June 30,
			2025		2024		2025		2024
			(in millions, except share and per share data)

Revenues:
	Commissions		$	516	$	406	$	1,030	$	785
	Other fees and services			62		68		140		127
	Other income (loss)			42		(36)		107		(18)
		Total non-interest income		620		438		1,277		894

	Interest income			1,891		1,828		3,609		3,588
	Interest expense			(1,031)		(1,036)		(1,979)		(2,049)
		Total net interest income		860		792		1,630		1,539
		Total net revenues		1,480		1,230		2,907		2,433

Non-interest expenses:
	Execution, clearing and distribution fees			116		115		237		216
	Employee compensation and benefits			163		146		317		291
	Occupancy, depreciation and amortization			24		25		48		51
	Communications			11		10		21		20
	General and administrative			61		52		123		102
	Customer bad debt			1		2		2		7
		Total non-interest expenses		376		350		748		687

Income before income taxes				1,104		880		2,159		1,746
Income tax expense				98		71		189		142

Net income				1,006		809		1,970		1,604
Net income attributable to noncontrolling interests				782		630		1,533		1,250

Net income available for common stockholders			$	224	$	179	$	437	$	354

Earnings per share¹:
	Basic		$	0.51	$	0.42	$	1.00	$	0.82
	Diluted		$	0.51	$	0.41	$	0.99	$	0.82

Weighted average common shares outstanding¹:
	Basic			438,457,863		430,876,080		437,083,330		429,579,700
	Diluted			441,439,924		434,507,344		440,459,081		433,552,552

¹ Prior period share and per share amounts have been retroactively adjusted to reflect the four-for-one forward stock split, effected in the form of a stock dividend, on June 17, 2025.

INTERACTIVE BROKERS GROUP, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(UNAUDITED)

			Three Months				Six Months
			Ended June 30,				Ended June 30,
			2025		2024		2025		2024
			(in millions, except share and per share data)

Comprehensive income:
	Net income available for common stockholders		$	224	$	179	$	437	$	354
	Other comprehensive income:
		Cumulative translation adjustment, before income taxes		79		(2)		107		(28)
		Income taxes related to items of other comprehensive income		-		-		-		-
	Other comprehensive income (loss), net of tax			79		(2)		107		(28)
Comprehensive income available for common stockholders			$	303	$	177	$	544	$	326

Comprehensive earnings per share¹:
	Basic		$	0.69	$	0.41	$	1.24	$	0.76
	Diluted		$	0.69	$	0.41	$	1.23	$	0.75

Weighted average common shares outstanding¹:
	Basic			438,457,863		430,876,080		437,083,330		429,579,700
	Diluted			441,439,924		434,507,344		440,459,081		433,552,552


Comprehensive income attributable to noncontrolling interests:
	Net income attributable to noncontrolling interests		$	782	$	630	$	1,533	$	1,250
	Other comprehensive income - cumulative translation adjustment			227		(8)		306		(84)
Comprehensive income attributable to noncontrolling interests			$	1,009	$	622	$	1,839	$	1,166

¹ Prior period share and per share amounts have been retroactively adjusted to reflect the four-for-one forward stock split, effected in the form of a stock dividend, on June 17, 2025.

INTERACTIVE BROKERS GROUP, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION

(UNAUDITED)

				June 30, 2025		December 31, 2024
				(in millions)

Assets
Cash and cash equivalents				$	4,688	$	3,633
Cash - segregated for regulatory purposes					45,057		36,600
Securities - segregated for regulatory purposes					36,972		27,846
Securities borrowed					10,145		5,369
Securities purchased under agreements to resell					9,529		6,575
Financial instruments owned, at fair value					3,856		1,924
Receivables from customers, net of allowance for credit losses					65,346		64,432
Receivables from brokers, dealers and clearing organizations					4,074		2,196
Other assets					1,808		1,567
	Total assets			$	181,475	$	150,142

Liabilities and equity

Liabilities
Short-term borrowings				$	8	$	14
Securities loaned					21,229		16,248
Financial instruments sold but not yet purchased, at fair value					494		293
Other payables:
	Customers				138,417		115,343
	Brokers, dealers and clearing organizations				1,682		476
	Other payables				1,127		1,171
					141,226		116,990
	Total liabilities				162,957		133,545

Equity
Stockholders' equity					4,825		4,280
Noncontrolling interests					13,693		12,317
	Total equity				18,518		16,597
	Total liabilities and equity			$	181,475	$	150,142

		June 30, 2025			December 31, 2024¹
Ownership of IBG LLC Membership Interests		Interests	%		Interests		%

IBG, Inc.		441,569,584	26.0%		435,726,456		25.8%
Noncontrolling interests (IBG Holdings LLC)		1,254,573,416	74.0%		1,254,573,416		74.2%

Total IBG LLC membership interests		1,696,143,000	100.0%		1,690,299,872		100.0%

¹ Prior period share and per share amounts have been retroactively adjusted to reflect the four-for-one forward stock split, effected in the form of a stock dividend, on June 17, 2025.

INTERACTIVE BROKERS GROUP, INC. AND SUBSIDIARIES

OPERATING DATA

EXECUTED ORDER VOLUMES:

(in 000's, except %)

	Customer	%	Principal	%	Total	%
Period	Orders	Change	Orders	Change	Orders	Change
2022	532,064		26,966		559,030
2023	483,015	(9%)	29,712	10%	512,727	(8%)
2024	661,666	37%	63,348	113%	725,014	41%

2Q2024	150,292		13,215		163,507
2Q2025	220,215	47%	28,372	115%	248,587	52%

1Q2025	211,148		28,393		239,541
2Q2025	220,215	4%	28,372	(0%)	248,587	4%

CONTRACT AND SHARE VOLUMES:

(in 000's, except %)

TOTAL

	Options	%	Futures¹	%	Stocks	%
Period	(contracts)	Change	(contracts)	Change	(shares)	Change
2022	908,415		207,138		330,035,586
2023	1,020,736	12%	209,034	1%	252,742,847	(23%)
2024	1,344,855	32%	218,327	4%	307,489,711	22%

2Q2024	321,141		55,171		73,734,105
2Q2025	393,051	22%	64,271	16%	96,450,620	31%

1Q2025	383,998		61,869		93,934,241
2Q2025	393,051	2%	64,271	4%	96,450,620	3%

CUSTOMER

	Options	%	Futures¹	%	Stocks	%
Period	(contracts)	Change	(contracts)	Change	(shares)	Change
2022	873,914		203,933		325,368,714
2023	981,172	12%	206,073	1%	248,588,960	(24%)
2024	1,290,770	32%	214,864	4%	302,040,873	22%

2Q2024	308,298		54,106		72,480,534
2Q2025	382,195	24%	63,918	18%	95,276,485	31%

1Q2025	369,931		61,381		92,763,867
2Q2025	382,195	3%	63,918	4%	95,276,485	3%

PRINCIPAL TRANSACTIONS

	Options	%	Futures¹	%	Stocks	%
Period	(contracts)	Change	(contracts)	Change	(shares)	Change
2022	34,501		3,205		4,666,872
2023	39,564	15%	2,961	(8%)	4,153,887	(11%)
2024	54,085	37%	3,463	17%	5,448,838	31%

2Q2024	12,843		1,065		1,253,571
2Q2025	10,856	(15%)	353	(67%)	1,174,135	(6%)

1Q2025	14,067		488		1,170,374
2Q2025	10,856	(23%)	353	(28%)	1,174,135	0%

Includes options on futures.

INTERACTIVE BROKERS GROUP, INC. AND SUBSIDIARIES

OPERATING DATA, CONTINUED

CUSTOMER STATISTICS

Year over Year		2Q2025		2Q2024	% Change
Total Accounts (in thousands)		3,866		2,924	32%
Customer Equity (in billions)¹	$	664.6	$	497.2	34%

Total Customer DARTs (in thousands)		3,552		2,386	49%

Cleared Customers
Commission per Cleared Commissionable Order²	$	2.65	$	3.01	(12%)
Cleared Avg. DARTs per Account (Annualized)		206		187	10%

Consecutive Quarters		2Q2025		1Q2025	% Change
Total Accounts (in thousands)		3,866		3,616	7%
Customer Equity (in billions)¹	$	664.6	$	573.5	16%

Total Customer DARTs (in thousands)		3,552		3,519	1%

Cleared Customers
Commission per Cleared Commissionable Order²	$	2.65	$	2.76	(4%)
Cleared Avg. DARTs per Account (Annualized)		206		220	(6%)

Excludes non-customers.

Commissionable Order - a customer order that generates commissions.

INTERACTIVE BROKERS GROUP, INC. AND SUBSIDIARIES

NET INTEREST MARGIN

(UNAUDITED)

			Three Months				Six Months
			Ended June 30,				Ended June 30,
			2025		2024		2025		2024
			(in millions)
Average interest-earning assets
	Segregated cash and securities		$	78,693	$	60,057	$	72,869	$	60,595
	Customer margin loans			60,928		52,422		62,646		49,538
	Securities borrowed			7,027		5,898		5,949		5,633
	Other interest-earning assets			14,747		11,218		13,601		10,585
	FDIC sweeps¹			5,226		4,023		5,006		3,942
			$	166,621	$	133,618	$	160,071	$	130,293

Average interest-bearing liabilities
	Customer credit balances		$	129,998	$	102,709	$	124,010	$	101,110
	Securities loaned			17,181		13,688		16,659		12,711
	Other interest-bearing liabilities			50		1		58		1
			$	147,229	$	116,398	$	140,727	$	113,821

Net interest income
	Segregated cash and securities, net²		$	756	$	740	$	1,419	$	1,504
	Customer margin loans³			709		755		1,484		1,433
	Securities borrowed and loaned, net			60		25		70		51
	Customer credit balances, net³			(857)		(894)		(1,674)		(1,775)
	Other net interest income^1/4			193		179		356		354
		Net interest income⁴	$	861	$	805	$	1,655	$	1,567

Net interest margin ("NIM")				2.07%		2.42%		2.09%		2.42%

Annualized yields
	Segregated cash and securities			3.86%		4.96%		3.93%		4.99%
	Customer margin loans			4.67%		5.79%		4.78%		5.82%
	Customer credit balances			2.64%		3.50%		2.72%		3.53%

Represents the average amount of customer cash swept into FDIC-insured banks as part of our Insured Bank Deposit Sweep Program. This item is not recorded in the Company's consolidated statements of financial condition. Income derived from program deposits is reported in other net interest income in the table above.

Net interest income on “Segregated cash and securities, net” for the three and six months ended June 30, 2025, excludes approximately $26 million of interest income, recorded in the consolidated statements of comprehensive income, related to taxes withheld at source in prior periods, which during the current quarter were determined to be fully refundable.

Interest income and interest expense on customer margin loans and customer credit balances, respectively, are calculated on daily cash balances within each customer’s account on a net basis, which may result in an offset of balances across multiple account segments (e.g., between securities and commodities segments).

⁴

Includes income from financial instruments that has the same characteristics as interest, but is reported in other fees and services and other income in the Company’s consolidated statements of comprehensive income. For the three and six months ended June 30, 2025 and 2024, $9 million, $17 million, $7 million, and $13 million were reported in other fees and services, respectively. For the three and six months ended June 30, 2025 and 2024, $18 million, $34 million, $6 million, and $15 million were reported in other income, respectively.

INTERACTIVE BROKERS GROUP, INC. AND SUBSIDIARIES

RECONCILIATION OF NON-GAAP FINANCIAL MEASURES

(UNAUDITED)

		Three Months				Six Months
		Ended June 30,				Ended June 30,
		2025		2024		2025		2024
		(in millions)

Adjusted net revenues¹
Net revenues - GAAP		$	1,480	$	1,230	$	2,907	$	2,433

Non-GAAP adjustments
	Currency diversification strategy, net		5		20		(15)		22
	Mark-to-market on investments²		(5)		40		(16)		51
Total non-GAAP adjustments			-		60		(31)		73
Adjusted net revenues		$	1,480	$	1,290	$	2,876	$	2,506

Adjusted income before income taxes¹
Income before income taxes - GAAP		$	1,104	$	880	$	2,159	$	1,746

Non-GAAP adjustments
	Currency diversification strategy, net		5		20		(15)		22
	Mark-to-market on investments²		(5)		40		(16)		51
Total non-GAAP adjustments			-		60		(31)		73
Adjusted income before income taxes		$	1,104	$	940	$	2,128	$	1,819

Adjusted pre-tax profit margin			75%		73%		74%		73%

		Three Months				Six Months
		Ended June 30,				Ended June 30,
		2025		2024		2025		2024
		(in millions)
Adjusted net income available for common stockholders¹
Net income available for common stockholders - GAAP		$	224	$	179	$	437	$	354

Non-GAAP adjustments
	Currency diversification strategy, net		1		5		(4)		5
	Mark-to-market on investments²		(1)		10		(4)		13
	Income tax effect of above adjustments³		0		(3)		2		(4)
Total non-GAAP adjustments			(0)		12		(6)		14
Adjusted net income available for common stockholders		$	224	$	191	$	431	$	368

Note: Amounts may not add due to rounding.

		Three Months				Six Months
		Ended June 30,				Ended June 30,
		2025		2024		2025		2024
		(in dollars)
Adjusted diluted EPS^1/4
Diluted EPS - GAAP		$	0.51	$	0.41	$	0.99	$	0.82

Non-GAAP adjustments
	Currency diversification strategy, net		0.00		0.01		(0.01)		0.01
	Mark-to-market on investments²		(0.00)		0.02		(0.01)		0.03
	Income tax effect of above adjustments³		0.00		(0.01)		0.01		(0.01)
Total non-GAAP adjustments			(0.00)		0.03		(0.01)		0.03
Adjusted diluted EPS		$	0.51	$	0.44	$	0.98	$	0.85

Diluted weighted average common shares outstanding			441,439,924		434,507,344		440,459,081		433,552,552

Note: Amounts may not add due to rounding.

Note: The term “GAAP” in the following explanation refers to generally accepted accounting principles in the United States.

¹Adjusted net revenues, adjusted income before income taxes, adjusted net income available for common stockholders and adjusted diluted earnings per share (“EPS”) are non-GAAP financial measures.

•	We define adjusted net revenues as net revenues adjusted to remove the effect of our currency diversification strategy and our net mark-to-market gains (losses) on investments².

•	We define adjusted income before income taxes as income before income taxes adjusted to remove the effect of our currency diversification strategy and our net mark-to-market gains (losses) on investments.

•	We define adjusted net income available to common stockholders as net income available for common stockholders adjusted to remove the after-tax effects attributable to IBG, Inc. of our currency diversification strategy and our net mark-to-market gains (losses) on investments.

•	We define adjusted diluted EPS as adjusted net income available for common stockholders divided by the diluted weighted average number of shares outstanding for the period.

Management believes these non-GAAP items are important measures of our financial performance because they exclude certain items that may not be indicative of our core operating results and business outlook and may be useful to investors and analysts in evaluating the operating performance of the business and facilitating a meaningful comparison of our results in the current period to those in prior and future periods. Our currency diversification strategy and our mark-to-market on investments are excluded because management does not believe they are indicative of our underlying core business performance. Adjusted net revenues, adjusted income before income taxes, adjusted net income available to common stockholders and adjusted diluted EPS should be considered in addition to, rather than as a substitute for, GAAP net revenues, income before income taxes, net income attributable to common stockholders and diluted EPS.

² Mark-to-market on investments represents the net mark-to-market gains (losses) on investments in equity securities that do not qualify for equity method accounting, which are measured at fair value; on our U.S. government and municipal securities portfolios, which are typically held to maturity; and on certain other investments.

³The income tax effect is estimated using the statutory income tax rates applicable to the Company.

⁴Prior period share and per share amounts have been retroactively adjusted to reflect the four-for-one forward stock split, effected in the form of a stock dividend, on June 17, 2025.