Investors holding Interactive Brokers stock (IBKR) got a fresh read on Interactive Brokers trading growth in June, with the broker’s monthly operating metrics showing daily average revenue trades (DARTs, the standard measure of how many fee-generating orders are executed each day) reaching 5.26 million, up 53% on June last year and 6% ahead of May.
The pace of that increase puts the trajectory in sharp relief. The broker recorded 3.45 million DARTs in June 2025, itself a 40% year-on-year rise. The year before, in June 2024, the figure stood at 2.47 million. In two years, daily trading volumes have more than doubled.
Interactive Brokers Trading Growth in Context
Client account numbers kept pace. Interactive Brokers ended June with 5.18 million client accounts, 34% more than a year earlier and 4% above the May total. The assets those clients hold have grown substantially: client equity closed the month at $930.3 billion, a 40% increase year on year, though it edged 1% lower from the end of May.
The Interactive Brokers June 2025 brokerage metrics press release adds texture on what clients are actually paying. The rolling twelve months’ average all-in cost of an IBKR PRO client U.S. Reg.-NMS stock trade was 3.6 basis points (hundredths of a percentage point) as of June 2025. On a typical order of 941 shares, the average commission came to $1.86. For equity options, the average cleared order ran to 6.1 contracts at $3.59; for futures, 2.9 contracts at $4.04.
Those numbers matter for UK investors comparing brokers, because all-in trading cost is frequently obscured by headline commission rates that exclude exchange fees and spreads. A 3.6 basis-point all-in rate on a $10,000 US equity trade works out at roughly $3.60, including those additional charges.
Margin loan balances climbed to $108.5 billion, up 67% year on year and 8% from May. That rise indicates clients are borrowing more against their portfolios, a pattern that tends to accompany rising markets and increased investor confidence, though it also amplifies losses if markets reverse.
AI Tools and New Markets Broaden the Platform
The June metrics sit alongside a period of product expansion at the broker. According to Interactive Brokers press releases, the broker integrated Claude into its platform on June 1, then on June 22 added ChatGPT and Grok, extending AI-generated trade support to options, futures and futures options. Clients can connect existing AI accounts to analyse portfolios and generate trade instructions, although all orders require client approval before execution.
On the market-access front, Interactive Brokers launched direct trading in Korea Exchange (KRX)-listed equities, describing the KRX as an over $4 trillion equity market, and positioning itself as the first major US-based broker to offer the market through its platform. Access is not available to residents of Korea, or to clients of Interactive Brokers Securities Japan Inc. or Interactive Brokers India Pvt. Ltd.
The Korea build-out did not stop there. Interactive Brokers subsequently launched trading on the Nextrade ATS (an alternative trading system that operates alongside the main exchange), meaning clients can now access Korean equities through both the Korea Exchange and Nextrade from a single platform spanning more than 170 markets worldwide.
For UK retail investors using Interactive Brokers via an ISA or SIPP wrapper, the Korea and AI developments are worth noting even if they seem distant. Broader market access increases the pool of diversification options, and AI-assisted order generation, however nascent, points toward tools that could eventually reshape how self-directed investors research and execute trades.
One further datapoint for longer-term shareholders: Interactive Brokers’ 2025 Annual Report filed with the SEC states that the average IBKR client account outperformed the S&P 500 index in 2025, after all fees and commissions, based on aggregate data for accounts meeting minimum balance thresholds.
The next test for the growth story is whether DARTs hold above the 5 million level in July, a month that historically sees quieter summer trading in US and European markets.
