Earnings release
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1 See the reconciliation of non-GAAP financial measures starting on page 11. 2 Daily average revenue trades (DARTs) are based on customer orders. 1 Exhibit 99.1 INTERACTIVE BROKERS GROUP ANNOUNCES 3Q2026 RESULTS — — — GAAP DILUTED EPS OF $0.69, ADJUSTED1 EPS OF $0.67 GAAP NET REVENUES OF $1.91 BILLION, ADJUSTED NET REVENUES OF $1.87 BILLION RAISES QUARTERLY DIVIDEND FROM $0.0875 TO $0.15 GREENWICH, CT, October 15, 2026 — Interactive Brokers Group, Inc. (Nasdaq: IBKR), an automated global broker, announced results for the quarter ended September 30, 2026. Reported diluted earnings per share were $0.69 for the current quarter and $0.67 as adjusted. For the year-ago quarter, reported diluted earnings per share were $0.59 and $0.57 as adjusted. Reported net revenues were $1.91 billion for the current quarter and $1.87 billion as adjusted. For the year-ago quarter, reported net revenues were $1.66 billion and $1.61 billion as adjusted. Reported income before income taxes was $1.50 billion for the current quarter and $1.45 billion as adjusted. For the year-ago quarter, reported income before income taxes were $1.31 billion and $1.27 billion as adjusted. Financial Highlights (All comparisons are to the year-ago quarter.) • Commission revenue increased 12% to $602 million on 18% higher DARTs2 and higher regulatory fees, which are passed through to customers. Customer trading volume in futures increased 13%, while stocks and options volumes decreased 24% and 1%, respectively. • Net interest income increased 19% to $1.15 billion, primarily on higher average customer margin loans and customer credit balances. • Other fees and services increased 33% to $88 million, led by increases of $11 million in risk exposure fees, $3 million in payments for order flow from exchange-mandated programs, and $3 million in market data fees. • Execution, clearing and distribution fees increased 46% to $134 million, mainly driven by a $30 million increase in regulatory fees due to a higher SEC Section 31 transaction fee rate. • Pretax profit margin for the current quarter was 78% both as reported and as adjusted. For the year-ago quarter, pretax margin was 79% both as reported and as adjusted. • Total equity of $23.3 billion. The Interactive Brokers Group, Inc. Board of Directors declared an increase in the quarterly cash dividend from $0.0875 per share to $0.15 per share. This dividend is payable on December 14, 2026, to shareholders of record as of December 1, 2026.
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2 Business Highlights (All comparisons are to the year-ago quarter.) • Customer accounts increased 35% to 5.58 million. • Customer equity increased 27% to $964.7 billion. • Total DARTs increased 18% to 4.27 million. • Customer credits increased 20% to $186.2 billion. • Customer margin loans increased 36% to $105.2 billion. Other Items Other income decreased 18% to $70 million. This decrease is comprised mainly of $50 million from our investing activities; partially offset by an increase of $36 million from 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 decreased our comprehensive earnings by $4 million, as the U.S. dollar value of the GLOBAL decreased by approximately 0.08%. The effects of the currency diversification strategy are reported as components of (1) Other Income (gain of $40 million) and (2) Other Comprehensive Income (loss of $44 million). Conference Call Information: Interactive Brokers Group, Inc. will hold a conference call with investors today, October 15, 2026, 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/BIb1b909eee7384370b303f70792b710c8 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 prediction markets around the clock on over 175 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.
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3 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.
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4 INTERACTIVE BROKERS GROUP, INC. AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) Three Months Nine Months Ended September 30, Ended September 30, 2026 2025 2026 2025 (in millions, except share and per share data) Revenues: Commissions $ 602 $ 537 $ 1,888 $ 1,567 Other fees and services 88 66 261 206 Other income 70 85 215 192 Total non-interest income 760 688 2,364 1,965 Interest income 2,433 2,101 6,616 5,710 Interest expense (1,279) (1,134) (3,501) (3,113) Total net interest income 1,154 967 3,115 2,597 Total net revenues 1,914 1,655 5,479 4,562 Non-interest expenses: Execution, clearing and distribution fees 134 92 382 329 Employee compensation and benefits 167 156 516 473 Occupancy, depreciation and amortization 29 24 83 72 Communications 11 11 34 32 General and administrative 78 62 214 185 Customer bad debt (1) (2) 10 - Total non-interest expenses 418 343 1,239 1,091 Income before income taxes 1,496 1,312 4,240 3,471 Income tax expense 148 126 383 315 Net income 1,348 1,186 3,857 3,156 Net income attributable to noncontrolling interests 1,034 923 2,964 2,456 Net income available for common stockholders $ 314 $ 263 $ 893 $ 700 Earnings per share: Basic $ 0.69 $ 0.59 $ 1.99 $ 1.59 Diluted $ 0.69 $ 0.59 $ 1.98 $ 1.58 Weighted average common shares outstanding: Basic 452,266,631 444,060,813 448,564,570 439,434,716 Diluted 453,923,924 446,528,983 450,818,725 442,507,940
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5 INTERACTIVE BROKERS GROUP, INC. AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) Three Months Nine Months Ended September 30, Ended September 30, 2026 2025 2026 2025 (in millions, except share and per share data) Comprehensive income: Net income available for common stockholders $ 314 $ 263 $ 893 $ 700 Other comprehensive income: Cumulative translation adjustment, before income taxes (12) (10) (48) 97 Income taxes related to items of other comprehensive income - - - - Other comprehensive income (loss), net of tax (12) (10) (48) 97 Comprehensive income available for common stockholders $ 302 $ 253 $ 845 $ 797 Comprehensive earnings per share: Basic $ 0.67 $ 0.57 $ 1.88 $ 1.81 Diluted $ 0.67 $ 0.57 $ 1.87 $ 1.80 Weighted average common shares outstanding: Basic 452,266,631 444,060,813 448,564,570 439,434,716 Diluted 453,923,924 446,528,983 450,818,725 442,507,940 Comprehensive income attributable to noncontrolling interests: Net income attributable to noncontrolling interests $ 1,034 $ 923 $ 2,964 $ 2,456 Other comprehensive income - cumulative translation adjustment (32) (28) (132) 278 Comprehensive income attributable to noncontrolling interests $ 1,002 $ 895 $ 2,832 $ 2,734
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6 INTERACTIVE BROKERS GROUP, INC. AND SUBSIDIARIES CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (UNAUDITED) September 30, 2026 December 31, 2025 (in millions) Assets Cash and cash equivalents $ 5,935 $ 4,963 Cash - segregated for regulatory purposes 58,695 50,332 Securities - segregated for regulatory purposes 38,376 26,521 Securities borrowed 12,086 11,589 Securities purchased under agreements to resell 10,005 7,117 Financial instruments owned, at fair value 4,896 4,982 Receivables from customers, net of allowance for credit losses 105,592 90,475 Receivables from brokers, dealers and clearing organizations 5,012 5,161 Other assets 2,638 2,100 Total assets $ 243,235 $ 203,240 Liabilities and equity Liabilities Short-term borrowings $ 18 $ 19 Securities loaned 35,212 24,751 Financial instruments sold but not yet purchased, at fair value 756 740 Other payables: Customers 180,451 154,336 Brokers, dealers and clearing organizations 1,890 1,566 Other payables 1,657 1,356 183,998 157,258 Total liabilities 219,984 182,768 Equity Stockholders' equity 6,215 5,363 Noncontrolling interests 17,036 15,109 Total equity 23,251 20,472 Total liabilities and equity $ 243,235 $ 203,240 September 30, 2026 December 31, 2025 Ownership of IBG LLC Membership Interests Interests % Interests % IBG, Inc. 453,172,548 26.6% 445,612,825 26.3% Noncontrolling interests (IBG Holdings LLC) 1,248,237,849 73.4% 1,250,737,416 73.7% Total IBG LLC membership interests 1,701,410,397 100.0% 1,696,350,241 100.0%
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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 2023 483,015 29,712 512,727 2024 661,666 37% 63,348 113% 725,014 41% 2025 915,616 38% 121,972 93% 1,037,588 43% 3Q2025 229,635 30,659 260,294 3Q2026 273,486 19% 37,616 23% 311,102 20% 2Q2026 299,110 45,070 344,180 3Q2026 273,486 (9%) 37,616 (17%) 311,102 (10%) CONTRACT AND SHARE VOLUMES: (in 000's, except %) TOTAL Options % Futures % Stocks % Period (contracts) Change (contracts) Change (shares) Change 2023 1,020,736 209,034 252,742,847 2024 1,344,855 32% 218,327 4% 307,489,711 22% 2025 1,668,228 24% 241,631 11% 421,707,895 37% 3Q2025 428,524 52,233 119,250,686 3Q2026 426,182 (1%) 59,134 13% 91,432,625 (23%) 2Q2026 459,831 65,909 109,464,979 3Q2026 426,182 (7%) 59,134 (10%) 91,432,625 (16%) CUSTOMER Options % Futures % Stocks % Period (contracts) Change (contracts) Change (shares) Change 2023 981,172 206,073 248,588,960 2024 1,290,770 32% 214,864 4% 302,040,873 22% 2025 1,623,384 26% 240,120 12% 417,457,770 38% 3Q2025 418,389 51,936 118,307,826 3Q2026 415,215 (1%) 58,677 13% 90,219,440 (24%) 2Q2026 446,906 65,337 108,174,094 3Q2026 415,215 (7%) 58,677 (10%) 90,219,440 (17%) PRINCIPAL Options % Futures % Stocks % Period (contracts) Change (contracts) Change (shares) Change 2023 39,564 2,961 4,153,887 2024 54,085 37% 3,463 17% 5,448,838 31% 2025 44,844 (17%) 1,511 (56%) 4,250,125 (22%) 3Q2025 10,135 297 942,860 3Q2026 10,967 8% 457 54% 1,213,185 29% 2Q2026 12,925 572 1,290,885 3Q2026 10,967 (15%) 457 (20%) 1,213,185 (6%) ________________________ 1 Includes options on futures. 1 1 1
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8 INTERACTIVE BROKERS GROUP, INC. AND SUBSIDIARIES OPERATING DATA, CONTINUED Year over Year 3Q2026 3Q2025 % Change Total Accounts (in thousands) 5,576 4,127 35% Customer Equity (in billions) $ 965 $ 758 27% Total Customer DARTs (in thousands) 4,273 3,616 18% Cleared Customers Commission per Cleared Commissionable Order $ 2.59 $ 2.70 (4%) Cleared Avg. DARTs per Account (Annualized) 168 195 (14%) Consecutive Quarters 3Q2026 2Q2026 % Change Total Accounts (in thousands) 5,576 5,185 8% Customer Equity (in billions) $ 965 $ 930 4% Total Customer DARTs (in thousands) 4,273 4,824 (11%) Cleared Customers Commission per Cleared Commissionable Order $ 2.59 $ 2.64 (2%) Cleared Avg. DARTs per Account (Annualized) 168 207 (19%) ________________________ 1 Excludes non-Customers. 2 Commissionable Order - a customer order that generates commissions. 1 2 1 2
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9 INTERACTIVE BROKERS GROUP, INC. AND SUBSIDIARIES NET INTEREST MARGIN (UNAUDITED) Three Months Nine Months Ended September 30, Ended September 30, 2026 2025 2026 2025 (in millions) Average interest-earning assets Segregated cash and securities $ 95,092 $ 81,906 $ 92,344 $ 75,934 Customer margin loans 104,032 70,805 96,654 65,380 Securities borrowed 12,290 9,037 10,075 6,995 Other interest-earning assets 19,468 16,037 18,503 14,784 FDIC sweeps 6,364 5,962 6,366 5,329 $ 237,246 $ 183,747 $ 223,942 $ 168,422 Average interest-bearing liabilities Customer credit balances $ 176,566 $ 141,763 $ 168,637 $ 130,262 Securities loaned 36,203 20,691 31,710 18,007 Other interest-bearing liabilities 376 361 361 160 $ 213,145 $ 162,815 $ 200,708 $ 148,429 Net interest income Segregated cash and securities, net $ 815 $ 786 $ 2,307 $ 2,205 Customer margin loans 1,114 821 3,007 2,305 Securities borrowed and loaned, net 65 133 142 204 Customer credit balances, net (1,028) (945) (2,848) (2,619) Other net interest income 225 204 636 559 Net interest income $ 1,191 $ 999 $ 3,244 $ 2,654 Net interest margin ("NIM") 1.99% 2.16% 1.94% 2.11% Annualized yields Segregated cash and securities 3.40% 3.81% 3.34% 3.88% Customer margin loans 4.25% 4.60% 4.16% 4.71% Customer credit balances 2.31% 2.64% 2.26% 2.69% ________________________ 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 We estimate that if the interest earned and paid on cash collateral related to our securities lending transactions were included under “Securities borrowed and loaned, net” in the table above, the total net interest income related to our securities lending activities would have been $427 million and $1,039 million for the three and nine months ended September 30, 2026, respectively, compared to $314 million and $751 million for the three and nine months ended September 30, 2025, respectively. Such additional interest attributed to our securities lending activities would be reclassified from net interest income on “Segregated cash and securities, net” and “Customer credit balances, net” in the table above, so it would have no effect on our overall net interest income or net interest margin. 4 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). 1 2 4 3 4 1/5 5
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10 5 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, 2026 and 2025, $11 million, $33 million, $10 million, and $27 million were reported in "Other fees and services", respectively. For the three and nine months ended September 30, 2026 and 2025, $26 million, $96 million, $22 million, and $56 million were reported in "Other income", respectively.
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11 INTERACTIVE BROKERS GROUP, INC. AND SUBSIDIARIES RECONCILIATION OF NON-GAAP FINANCIAL MEASURES (UNAUDITED) Three Months Nine Months Ended September 30, Ended September 30, 2026 2025 2026 2025 Adjusted net revenues (in millions) Net revenues - GAAP $ 1,914 $ 1,655 $ 5,479 $ 4,562 Non-GAAP adjustments Currency diversification strategy, net (40) (4) (87) (19) Mark-to-market on investments (3) (41) 42 (57) Total non-GAAP adjustments (42) (45) (44) (76) Adjusted net revenues $ 1,872 $ 1,610 $ 5,435 $ 4,486 Adjusted income before income taxes (in millions) Income before income taxes - GAAP $ 1,496 $ 1,312 $ 4,240 $ 3,471 Non-GAAP adjustments Currency diversification strategy, net (40) (4) (87) (19) Mark-to-market on investments (3) (41) 42 (57) Total non-GAAP adjustments (42) (45) (44) (76) Adjusted income before income taxes $ 1,454 $ 1,267 $ 4,196 $ 3,395 Adjusted pre-tax profit margin 78% 79% 77% 76% Adjusted net income available for common stockholders (in millions) Net income available for common stockholders - GAAP $ 314 $ 263 $ 893 $ 700 Non-GAAP adjustments Currency diversification strategy, net (11) (1) (23) (5) Mark-to-market on investments (1) (11) 11 (15) Income tax effect of above adjustments 2 3 2 5 Total non-GAAP adjustments (9) (9) (10) (15) Adjusted net income available for common stockholders $ 305 $ 253 $ 883 $ 684 Adjusted diluted EPS (in dollars, except share amounts) Diluted EPS - GAAP $ 0.69 $ 0.59 $ 1.98 $ 1.58 Non-GAAP adjustments Currency diversification strategy, net (0.02) (0.00) (0.05) (0.01) Mark-to-market on investments (0.00) (0.02) 0.03 (0.03) Income tax effect of above adjustments 0.01 0.01 0.00 0.02 Total non-GAAP adjustments (0.02) (0.02) (0.02) (0.03) Adjusted diluted EPS $ 0.67 $ 0.57 $ 1.96 $ 1.55 Diluted weighted average common shares outstanding 453,923,924 446,528,983 450,818,725 442,507,940 1 2 4 4 1 2 4 4 1 2 3 4 4 1 2 3 4 4
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12 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 Amounts may not add due to rounding.