Thomas Peterffy, chairman of US brokerage firm Interactive Brokers, has expressed concern that the Bitcoin market and excessive leverage in the financial system could cause stock prices to fall in 2025. Peterffy highlighted the rapid increase in margin balances and the surge in margin-based risk investment in the Bitcoin market due to low fees on the Chicago Mercantile Exchange (CME). He warned that a 30-50% Bitcoin crash in a single day could lead to numerous bankruptcies and potentially overwhelm clearing organizations. Peterffy emphasized the importance of limiting Bitcoin investments to a maximum of 10%.

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