Interactive Brokers reports 47% year-over-year jump in September trades

Interactive Brokers Group (IBKR) reported robust September 2025 operational metrics, with daily average revenue trades (DARTs) increasing 47% year-over-year to 3.864 million and client equity reaching $757.5 billion, up 40% from the prior year. Margin loan balances also surged 39% year-over-year to $77.3 billion, reflecting strong client engagement and asset growth. The company's stock has delivered a 100% return over the past year and is trading above its fair value, while BofA Securities recently raised its price target to $71 with a Buy rating, citing strong Q2 2025 earnings driven by net interest income. Further underscoring its market relevance, IBKR is set to join the S&P 500 and recently led a $104 million funding round for crypto infrastructure firm Zerohash.

Analysis

Interactive Brokers (IBKR) reported exceptionally strong operational metrics for September 2025, underscoring significant business momentum. Daily average revenue trades (DARTs) surged 47% year-over-year to 3.864 million, while client equity grew 40% to $757.5 billion. The 39% year-over-year increase in margin loan balances to $77.3 billion is a key positive, directly supporting the net interest income that drove the firm's Q2 2025 earnings beat. It is important to note that the headline client account growth of 73,100 understates the firm's organic acquisition, as the figure was depressed by the one-off withdrawal of an introducing broker (a Futu subsidiary) with 38,800 accounts; the underlying growth was a more robust 111,900 accounts. This fundamental strength is complemented by powerful catalysts, including the company's imminent inclusion in the S&P 500 index, which will create structural demand from index-tracking funds. Strategically, IBKR is expanding its footprint in digital assets by leading a $104 million funding round for crypto infrastructure firm Zerohash and continues to innovate with new platform releases. However, despite this bullish picture and a recent price target increase to $71 from BofA Securities, the stock's 100% return over the past year has pushed its valuation to a level considered above its fair value.

Key Decisions for Investors

• Investors with existing positions should consider the strong fundamental momentum and near-term catalyst of S&P 500 inclusion as supportive factors for holding the stock.
• Potential new investors should be cautious of the current valuation, which is noted as being above fair value after a 100% annual return, and may consider initiating a position on any market-driven pullbacks.
• Monitor margin loan balances and DARTs in upcoming reports as key indicators of sustained growth, as these are primary drivers of revenue and net interest income.
• The successful integration and strategic developments following the Zerohash investment should be watched closely as a potential new, long-term growth vector in the digital asset space.