Interactive Brokers’ margin loan balances reached $100.7 billion in July 2026, up 49% year-over-year. Average margin loans during Q2 2026 hit $108.5 billion, a 67% increase from the prior year, fueling a 23% rise in net interest income. The brokerage firm offers some of the lowest margin rates in the market, between 4.13% and 5.13% for USD balances, compared to over 10% at many competitors. With $907 billion in total client assets and an 11% margin-to-asset ratio, the leverage surge remains below historical peaks, though the speed of growth has drawn regulatory scrutiny.
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