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Tuesday, September 8, 2026 · London
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Interactive Brokers Earns Interest on $182 Billion of Its Clients' Idle Cash. Will Anthropic's IPO Drain It?

Interactive Brokers (IBKR) ended June with $182.4 billion of uninvested client cash, growing by 27% year over year. By August, this figure had risen to $185.6 billion.

Interactive Brokers Earns Interest on $182 Billion of Its Clients' Idle Cash. Will Anthropic's IPO Drain It?

Interactive Brokers (IBKR) ended June with $182.4 billion of uninvested client cash, growing by 27% year over year. By August, this figure had risen to $185.6 billion. The brokerage earns interest on this idle cash by segregating customer funds and investing them in short-term U.S. government securities, keeping a spread of half a percentage point below the federal funds rate. This practice makes net interest income the company’s largest revenue line, rising 23% year over year to $1.06 billion in Q2, driven by growing customer balances and margin loans. Despite declining interest rates, the net interest margin narrowed slightly to 1.93% from 2027% a year earlier, yet net interest income increased due to larger balances.

Anthropic’s potential IPO could soon present clients with an opportunity to invest. The AI company’s valuation is projected to reach around $2 trillion, with the IPO potentially surpassing the $85.7 billion raised by SpaceX in June. However, the offering’s timing remains uncertain, with no confirmed prospectus, price, or share count. Interactive Brokers participated in SpaceX’s IPO in Europe, offering retail clients access, but this did not significantly reduce the cash pile. Client equity grew to $962.8 billion in August, up 35% year over year, and daily trading volume increased by 23%. New customer accounts also surged to 5.46 million, up 35% from the previous year.

While Anthropic’s IPO could theoretically drain cash, the company’s growth strategy relies on account expansion and increased trading activity. Commissions, though rising to a record $673 million in Q2, remain secondary to net interest income. The stock price is near $92, trading at 29 times next-year earnings, reflecting a rich valuation despite strong revenue growth and pretax profit margins of 77%. The article concludes that account growth is a more critical factor for the brokerage than potential IPO-related cash outflow.

Source: The Motley Fool

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