Robinhood Markets Inc. (HOOD) saw its stock price plummet 5.02% during Tuesday's intraday trading session. The sharp decline came as investors reacted to new concerns about the sustainability of the company's core business model.

The sell-off was triggered by a JPMorgan report warning that U.S. brokerage firms and custodians may soon start charging distribution fees to ETF managers. This potential shift could significantly alter the cost structure of the $13.5 trillion U.S. ETF industry. Robinhood, which built its business on zero-commission trading, faces particular risk as this development may undermine the revenue dynamics that have supported its disruptive model.

According to the report, traditional brokers have been pressured to eliminate trading commissions to compete with fintech platforms like Robinhood. With investors increasingly moving assets from mutual funds to ETFs, brokers are now exploring distribution fees as a way to recover lost revenue. J.P. Morgan estimates this could add $2 billion to $4 billion in annual distribution costs to the ETF industry, creating new challenges for Robinhood's business strategy.