Interactive Brokers 3Q 2026 Earnings: Client Growth and Margin Lending Drive Another High-Margin Quarter

Interactive Brokers reported third-quarter GAAP net revenue of $1.91B, up 16% year over year, while GAAP diluted EPS increased to $0.69 from $0.59. Adjusted net revenue rose 16% to $1.87B and adjusted EPS increased to $0.67 from $0.57.

The quarter was broadly strong, led by higher customer balances, margin borrowing and account growth rather than a broad acceleration in trading activity. The company maintained a 78% pretax margin, raised its quarterly dividend to $0.15 per share, and continued to invest in customer acquisition and new product areas including AI-enabled trading, prediction markets and RIA services.

Earnings Snapshot

The Bigger Story

Interactive Brokers continues to show that its earnings engine is increasingly driven by the scale of client balances, margin lending and interest income, not solely by transaction volumes. Net interest income contributed $1.15B, or roughly 60% of quarterly GAAP revenue, and rose 19% despite a lower average U.S. federal funds rate than a year earlier.

The key operating development was continued growth in funded accounts and margin balances. Accounts rose 35% year over year and 8% sequentially to 5.58 million, while customer equity reached $964.7B. Customer margin loans increased 36% to $105.2B, benefiting from a more risk-on investing environment as the quarter progressed.

That balance growth helped offset softer activity relative to the second quarter. Customer DARTs fell 11% sequentially, while average annualized DARTs per cleared account declined 19% to 168. The company characterized the moderation as broad-based across customer types rather than concentrated in a particular segment.

Revenue and Operating Performance

Commission revenue increased 12% to $602M, the third consecutive quarter above $600M. Customer DARTs rose 18% year over year to 4.27 million, but revenue growth lagged trading growth as commission per cleared commissionable order fell 4% to $2.59.

Trading activity varied significantly by product. Futures volume increased 13% year over year, options volume declined 1%, and stock-share volume decreased 24%. Management said customers gravitated toward larger, higher-quality technology names, where returns exceeded broader market indices. Lower-priced stocks, which tend to produce high share volume relative to notional value, accounted for much of the decline in stock trading volume.

Commission revenue also included higher regulatory fees passed through to customers. Those fees boosted both commission revenue and execution costs, making part of the reported transaction-revenue growth economically neutral.

Net interest income increased 19% to $1.15B, primarily because of larger customer margin loans and credit balances. Average margin loans increased sharply, while higher segregated cash and securities balances reflected account growth. The company said a lower average U.S. federal funds rate year over year was more than offset by balance growth.

The net interest margin table showed net interest income of $1.19B, including certain interest-like income classified elsewhere under GAAP. On that basis, net interest margin declined to 1.99% from 2.16% a year earlier. Annualized yields on segregated cash, margin loans and customer credit balances all declined, reflecting lower benchmark rates, but higher balances preserved net interest income growth.

Other fees and services rose 33% to $88M. The increase was led by an $11M rise in risk exposure fees, a $3M increase in exchange-mandated payments for order flow, and a $3M increase in market-data fees. Management linked the risk exposure fees to a more risk-on environment.

Profitability and Margins

GAAP pretax income increased 14% to $1.50B, while adjusted pretax income rose 15% to $1.45B. The reported and adjusted pretax margins were both 78%, down modestly from 79% a year earlier but still extending the company’s streak of quarterly pretax margins above 70% to eight quarters.

The margin outcome reflects the company’s automated operating model, although expenses grew faster than revenue in several categories. Execution, clearing and distribution costs rose $42M, or 46%, to $134M. About $30M of the increase came from the SEC Section 31 transaction fee, which had been zero in the prior-year quarter and is largely passed through to customers.

Excluding $28M of non-transaction costs, predominantly market-data fees, management calculated that execution and clearing costs represented 17% of commission revenue. That equated to an 83% gross transactional profit margin.

Compensation and benefits expense rose 7% to $167M, with the compensation-to-adjusted-revenue ratio holding at 9%. Headcount was 3,290 at September 30. General and administrative expense increased to $78M from $62M, primarily due to higher advertising spending as Interactive Brokers expands digital customer acquisition efforts.

Adjusted results exclude the company’s currency diversification strategy and mark-to-market investment gains or losses. Those items reduced third-quarter GAAP net revenue by $42M and reduced GAAP EPS by $0.02 relative to adjusted EPS.

Demand, Customers and Pricing

Customer growth remained the most important demand indicator. Total accounts increased 35% year over year, and customer equity rose 27% to $964.7B. The sequential account increase of 8% indicates that new-account momentum remained strong even as trading activity slowed from the second quarter.

Management said account growth came from individual and institutional clients across regions. It sees opportunity to gain share in both established and newer markets because its global platform can be adapted to local requirements without building separate country-specific businesses.

Overnight trading is becoming a more meaningful engagement channel for global clients. Overnight trades rose to more than 10 million in the third quarter, from 3.5 million a year earlier. This trend supports the company’s strategy of offering global-market access across time zones.

The company is also targeting the registered investment adviser market. Its tax-aware long-short strategies had approximately $300M of assets by quarter-end. Management expects the opportunity to grow as it adds strategy providers, improves adviser onboarding and enhances integrations with multi-custodial platforms. It also sees an opening to attract smaller RIAs following a competitor’s planned $100M minimum asset threshold for RIAs.

Management described the introducing-broker pipeline as stable at a strong level, with multiple integrations in progress and new firms going live. A South Korean brokerage, Daol Investment & Securities, launched a global securities-trading platform using Interactive Brokers’ technology and infrastructure during the quarter.

What is Interactive Brokers’ outlook for Q4 2026?

Interactive Brokers did not provide formal revenue, EPS or margin guidance for the fourth quarter.

Management said it expects trading activity to respond to market volatility and suggested volatility could rise ahead of U.S. midterm elections. It did not identify any customer segment or geographic trend that it viewed as concerning, despite the sequential decline in trading activity.

For interest income, management estimated that a 25-basis-point increase or decrease in the U.S. federal funds rate would increase or decrease annual net interest income by approximately $83M, based on September 30 balances and a 3.88% effective federal funds rate. A comparable 25-basis-point move in relevant non-U.S. benchmark rates would affect annual net interest income by approximately $35M.

Management also said that the timing of mid-September rate increases by several central banks means much of their impact on net interest income should be recognized in the fourth quarter. However, the company remains exposed to changing rates, customer cash deployment and the mix of client balances across currencies.

Product expansion remains a major part of the outlook. The company is expanding autonomous AI trading beyond an initial limited rollout to eligible clients in several countries. About 3,000 clients who had used its AI connector were initially invited. Management expects AI tools to increase trading activity over time as clients use them to process more information and execute strategies more efficiently.

Interactive Brokers also plans to add more tax-aware strategy providers by year-end and early next year. In prediction markets, it has added access to Kalshi and CME offerings and is working on a Polymarket integration. Management also said it is preparing to offer Cboe’s planned single-stock KPI contracts once available.

Balance Sheet, Cash Flow and Capital

Interactive Brokers ended the quarter with total assets of $243.2B, up from $203.2B at the end of 2025. The increase was driven primarily by higher customer margin receivables and segregated cash and securities balances.

Customer receivables, net of credit-loss allowances, rose to $105.6B from $90.5B at year-end 2025. Customer payables increased to $180.5B from $154.3B, reflecting growth in client cash balances. Total equity reached $23.3B, compared with $20.5B at year-end.

The company reported $5.94B of cash and cash equivalents and said it has no long-term debt. That capital position supported a substantial dividend increase, with the quarterly dividend raised to $0.15 per share from $0.0875. The new annualized dividend is $0.60 per share.

Management said the board generally aims to pay dividends equivalent to roughly 0.5% to 1% of market value. It indicated that it does not currently envision circumstances that would require a dividend cut, though that statement is a capital-allocation view rather than a formal payout commitment.

What Investors Should Watch

1. Net interest income resilience

Net interest income remains Interactive Brokers’ largest revenue source. Investors should monitor customer margin loans, client cash balances and benchmark-rate changes, particularly because lower yields have already reduced reported net interest margin.

2. Trading activity per account

Accounts are expanding rapidly, but activity per cleared account declined year over year and sequentially. A sustained recovery in DARTs per account would provide a stronger boost to commission revenue and other transaction-linked fees.

3. Margin-loan growth and market risk appetite

Margin loans increased 36% year over year to $105.2B. Continued growth would support interest income, but the pace will depend on customer risk appetite, equity-market performance and the level of borrowing demand.

4. Customer acquisition efficiency

Advertising was the principal driver of higher G&A expense. Management said newer digitally acquired customers have been higher value but fewer in number, making customer-acquisition efficiency an important issue as spending scales.

5. RIA, AI and prediction-market adoption

The tax-aware RIA offering, autonomous AI trading and expanded prediction-market access are strategically relevant but remain relatively early-stage. Investors should look for evidence that these products generate durable account growth, customer assets or trading activity rather than simply expanding the product catalog.

AlgovestIQ Takeaway

Interactive Brokers delivered another strong quarter, with double-digit growth in revenue, EPS, accounts, customer equity and margin loans. The company’s 78% pretax margin demonstrates the scalability of its automation-heavy brokerage model, while the dividend increase signals management’s confidence in the capital position and recurring earnings capacity.

The more nuanced point is that revenue quality remains closely tied to client balances and interest-rate conditions. Net interest income grew 19% despite lower average rates because margin loans and customer balances expanded sharply. That is a favorable result, but it also underscores that future earnings growth depends on continued asset gathering and customer leverage demand as much as it does on transaction activity.

Trading trends were less uniformly positive. DARTs grew year over year but declined 11% sequentially, with lower activity per account and softer stock-share volumes. Commission revenue still increased, although regulatory-fee pass-throughs accounted for part of the reported growth without contributing to profitability.

The central investment question is whether Interactive Brokers can sustain high-teens earnings growth as interest-rate support becomes less certain. Evidence of continued account growth, rising client assets, stable margin borrowing and improving engagement per account would strengthen that case. Conversely, sustained pressure on net interest margin, weaker margin balances or rising acquisition costs without commensurate customer-value growth would make the current earnings trajectory harder to maintain.