Interactive Brokers · Earnings release · 8-K Exhibit 99

INTERACTIVE BROKERS GROUP ANNOUNCES 3Q2025 RESULTS

— — —

GAAP DILUTED EPS OF $0.59, ADJUSTED1 EPS OF $0.57

GAAP NET REVENUES OF $1,655 MILLION, ADJUSTED NET REVENUES OF $1,610 MILLION

GREENWICH, CT, October 16, 2025 — Interactive Brokers Group, Inc. (Nasdaq: IBKR), an automated global electronic broker, announced results for the quarter ended September 30, 2025.

Reported diluted earnings per share were $0.59 for the current quarter and $0.57 as adjusted. For the year-ago quarter, reported diluted earnings per share2 were $0.42 and $0.40 as adjusted.

Reported net revenues were $1,655 million for the current quarter and $1,610 million as adjusted. For the year-ago quarter, reported net revenues were $1,365 million and $1,327 million as adjusted.

Reported income before income taxes was $1,312 million for the current quarter and $1,267 million as adjusted. For the year-ago quarter, reported income before income taxes was $909 million and $871 million as adjusted.

Financial Highlights

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

•

Commission revenue increased 23% to $537 million on higher customer trading volumes. T1Customer trading volume in stocks and options increased 67% and 27%, respectively, while futures decreased 7%.

•

T2Net interest income increased 21% to $967 million on stronger securities lending activity and higher average customer margin loans and customer credit balances.

•

Other fees and services decreased 8% to $66 million, led by a decrease of $12 million in risk exposure fees, which was partially offset by a $3 million increase in FDIC sweep fees.

•

T3Execution, clearing and distribution fees decreased 21% to $92 million, driven by lower regulatory fees, as the SEC Section 31 transaction fee rate was reduced to zero on May 14, 2025, and greater capture of liquidity rebates from certain exchanges due to higher trading volumes in stocks and options.

•

T4General and administrative expenses decreased 59% to $62 million, driven primarily by the non-recurrences of $88 million related to legal and regulatory matters and of $12 million related to the consolidation of our European subsidiaries; partially offset by an increase of $10 million in advertising expenses.

•

T5Pretax profit margin for the current quarter was 79% both as reported and as adjusted. For the year-ago quarter, pretax margin was 67% as reported and 66% as adjusted.

•

Total equity of $19.5 billion.

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

1

Business Highlights

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

•

T6Customer accounts increased 32% to 4.13 million.

•

Customer equity increased 40% to $757.5 billion.

•

Total DARTs3 increased 34% to 3.62 million.

•

Customer credits increased 33% to $154.8 billion.

•

Customer margin loans increased 39% to $77.3 billion.

Other Items

Other income increased 52% to $85 million. This increase is comprised mainly of $42 million related to our investing activities, partially offset by a $21 million lower gain related to our currency diversification.

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, T7our currency diversification strategy decreased our comprehensive earnings by $33 million, as the U.S. dollar value of the GLOBAL decreased by approximately 0.25%. The effects of the currency diversification strategy are reported as components of (1) Other Income (gain of $4 million) and (2) Other Comprehensive Income (loss of $37 million).

Conference Call Information:

Interactive Brokers Group, Inc. will hold a conference call with investors today, October 16, 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/BIac68f27184924c038fe4a9b3e32b300f 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, Inc. (NASDAQ: IBKR) is a member of the S&P 500. Its 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.

2

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.

3

INTERACTIVE BROKERS GROUP, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF INCOME

(UNAUDITED)

Three Months

Nine Months

Ended September 30,

Ended September 30,

(in millions, except share and per share data)

Revenues:

Commissions

$

$

$

$

Other fees and services

Other income

Total non-interest income

Interest income

Interest expense

Total net interest income

Total net revenues

Non-interest expenses:

Execution, clearing and distribution fees

Employee compensation and benefits

Occupancy, depreciation and amortization

Communications

9

General and administrative

Customer bad debt

(2)

7

-

Total non-interest expenses

Income before income taxes

Income tax expense

Net income

Net income attributable to noncontrolling interests

Net income available for common stockholders

$

$

$

$

Earnings per share1:

Basic

$

$

$

$

Diluted

$

$

$

$

Weighted average common shares outstanding1:

Basic

Diluted

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.

4

INTERACTIVE BROKERS GROUP, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(UNAUDITED)

Three Months

Nine Months

Ended September 30,

Ended September 30,

(in millions, except share and per share data)

Comprehensive income:

Net income available for common stockholders

$

$

$

$

Other comprehensive income:

Cumulative translation adjustment, before income taxes

Income taxes related to items of other comprehensive income

-

-

-

-

Other comprehensive income (loss), net of tax

Comprehensive income available for common stockholders

$

$

$

$

Comprehensive earnings per share1:

Basic

$

$

$

$

Diluted

$

$

$

$

Weighted average common shares outstanding1:

Basic

Diluted

Comprehensive income attributable to noncontrolling interests:

Net income attributable to noncontrolling interests

$

$

$

$

Other comprehensive income - cumulative translation adjustment

Comprehensive income attributable to noncontrolling interests

$

$

$

$

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.

5

INTERACTIVE BROKERS GROUP, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION

(UNAUDITED)

(in millions)

Assets

Cash and cash equivalents

$

$

Cash - segregated for regulatory purposes

Securities - segregated for regulatory purposes

Securities borrowed

Securities purchased under agreements to resell

Financial instruments owned, at fair value

Receivables from customers, net of allowance for credit losses

Receivables from brokers, dealers and clearing organizations

Other assets

Total assets

$

$

Liabilities and equity

Liabilities

Short-term borrowings

$

$

Securities loaned

Securities sold under agreements to repurchase

-

Financial instruments sold but not yet purchased, at fair value

Other payables:

Customers

Brokers, dealers and clearing organizations

Other payables

Total liabilities

Equity

Stockholders' equity

Noncontrolling interests

Total equity

Total liabilities and equity

$

$

Ownership of IBG LLC Membership Interests

Interests

%

Interests

%

IBG, Inc.

Noncontrolling interests (IBG Holdings LLC)

Total IBG LLC membership interests

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.

6

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

(9%)

(8%)

4%

8%

5%

CONTRACT AND SHARE VOLUMES:

(in 000's, except %)

TOTAL

Options

%

Futures1

%

Stocks

%

Period

(contracts)

Change

(contracts)

Change

(shares)

Change

1%

4%

(8%)

9%

CUSTOMER

Options

%

Futures1

%

Stocks

%

Period

(contracts)

Change

(contracts)

Change

(shares)

Change

1%

4%

(7%)

9%

PRINCIPAL TRANSACTIONS

Options

%

Futures1

%

Stocks

%

Period

(contracts)

Change

(contracts)

Change

(shares)

Change

(8%)

(7%)

1

Includes options on futures.

7

INTERACTIVE BROKERS GROUP, INC. AND SUBSIDIARIES

OPERATING DATA, CONTINUED

CUSTOMER STATISTICS

Year over Year

% Change

Total Accounts (in thousands)

Customer Equity (in billions)1

$

$

Total Customer DARTs (in thousands)

Cleared Customers

Commission per Cleared Commissionable Order2

$

$

(5%)

Cleared Avg. DARTs per Account (Annualized)

(2%)

Consecutive Quarters

% Change

Total Accounts (in thousands)

7%

Customer Equity (in billions)1

$

$

Total Customer DARTs (in thousands)

2%

Cleared Customers

Commission per Cleared Commissionable Order2

$

$

2%

Cleared Avg. DARTs per Account (Annualized)

(5%)

1

Excludes non-customers.

2

Commissionable Order - a customer order that generates commissio

8

INTERACTIVE BROKERS GROUP, INC. AND SUBSIDIARIES

NET INTEREST MARGIN

(UNAUDITED)

Three Months

Nine Months

Ended September 30,

Ended September 30,

(in millions)

Average interest-earning assets

Segregated cash and securities

$

$

$

$

Customer margin loans

Securities borrowed

Other interest-earning assets

FDIC sweeps1

$

$

$

$

Average interest-bearing liabilities

Customer credit balances

$

$

$

$

Securities loaned

Other interest-bearing liabilities

1

1

$

$

$

$

Net interest income

Segregated cash and securities, net2

$

$

$

$

Customer margin loans3

Securities borrowed and loaned, net

Customer credit balances, net3

Other net interest income1/4

Net interest income4

$

$

$

$

Net interest margin ("NIM")

Annualized yields

Segregated cash and securities

Customer margin loans

Customer credit balances

1

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.

2

Net interest income on "Segregated cash and securities, net" for the nine months ended September 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 was determined to be fully refundable.

3

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 nine months ended September 30, 2025 and 2024, $10 million, $27 million, $7 million, and $20 million were reported in other fees and services, respectively. For the three and nine months ended September 30, 2025 and 2024, $22 million, $56 million, $17 million, and $32 million were reported in other income, respectively.

9

INTERACTIVE BROKERS GROUP, INC. AND SUBSIDIARIES

RECONCILIATION OF NON-GAAP FINANCIAL MEASURES

(UNAUDITED)

Three Months

Nine Months

Ended September 30,

Ended September 30,

(in millions)

Adjusted net revenues1

Net revenues - GAAP

$

$

$

$

Non-GAAP adjustments

Currency diversification strategy, net

(4)

(3)

Mark-to-market on investments2

Total non-GAAP adjustments

Adjusted net revenues

$

$

$

$

Adjusted income before income taxes1

Income before income taxes - GAAP

$

$

$

$

Non-GAAP adjustments

Currency diversification strategy, net

(4)

(3)

Mark-to-market on investments2

Total non-GAAP adjustments

Adjusted income before income taxes

$

$

$

$

Adjusted pre-tax profit margin

Three Months

Nine Months

Ended September 30,

Ended September 30,

(in millions)

Adjusted net income available for common stockholders1

Net income available for common stockholders - GAAP

$

$

$

$

Non-GAAP adjustments

Currency diversification strategy, net

(1)

(6)

(5)

(1)

Mark-to-market on investments2

(3)

Income tax effect of above adjustments3

3

2

5

(2)

Total non-GAAP adjustments

(9)

(8)

7

Adjusted net income available for common stockholders

$

$

$

$

Note: Amounts may not add due to rounding.

Three Months

Nine Months

Ended September 30,

Ended September 30,

(in dollars)

Adjusted diluted EPS1/4

Diluted EPS - GAAP

$

$

$

$

Non-GAAP adjustments

Currency diversification strategy, net

Mark-to-market on investments2

Income tax effect of above adjustments3

Total non-GAAP adjustments

Adjusted diluted EPS

$

$

$

$

Diluted weighted average common shares outstanding

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.

1 Adjusted 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.

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

4 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.