JPMorgan Chase CEO Jamie Dimon has warned that rising leverage across financial markets could amplify the impact of any significant disruption involving a major investor or hedge fund, increasing risks to overall market stability.

Speaking in an interview with CNBC, Dimon said leverage associated with prime brokerages, hedge funds, exchange traded funds and Treasury arbitrage strategies has reached elevated levels. He noted that while officially reported margin borrowing is already at record highs, a significant amount of leverage remains embedded in other financing arrangements that are not reflected in traditional margin debt statistics.

According to the latest data released by the Financial Industry Regulatory Authority (FINRA), debit balances in US customer securities margin accounts increased to approximately $1.50 trillion in June 2026 from $1.42 trillion in May, representing a monthly increase of about 6.1 percent.

Leverage enables investors to take positions larger than their invested capital, potentially magnifying both gains and losses. During periods of sharp market declines, lenders may require additional collateral or force the liquidation of leveraged positions, which can accelerate selling pressure and spread volatility across financial markets.

Dimon's remarks follow the recent unwinding of positions held by Situational Awareness, an artificial intelligence focused hedge fund managed by former OpenAI researcher Leopold Aschenbrenner. The fund reportedly sold the majority of its public equity portfolio, valued at around $16 billion, to Citadel after suffering significant losses in technology investments. The portfolio included holdings in companies such as Broadcom, Intel and CoreWeave.

Reuters reported that JPMorgan was among the prime brokers involved in facilitating the transaction, while Citadel acquired the portion of the portfolio financed through broker leverage. It remains unclear whether the hedge fund faced margin calls before the sale.

Despite the incident, Dimon said financial markets absorbed the unwinding without broader disruption. He did not characterize current leverage levels as a systemic threat or predict an imminent financial crisis.

US regulators have expressed similar concerns regarding leverage in the financial system. The US Federal Reserve's Financial Stability Report released in May 2026 noted that hedge fund leverage remains near historical highs, particularly among larger funds, and warned that a sudden loss of financing at a highly leveraged institution could create spillover risks across markets.

Separately, a Federal Reserve analysis estimated that large hedge funds' gross exposure to US Treasury securities doubled to approximately $4 trillion between 2023 and September 2025. It also estimated that the Treasury cash futures basis trade had expanded to around $830 billion, highlighting the growing use of leveraged trading strategies.

Dimon added that banks and clearing houses typically increase collateral requirements during periods of heightened market volatility, which could tighten financing conditions if market fluctuations intensify. He also emphasized that, unlike the 2008 global financial crisis, the current concern is primarily related to leverage rather than widespread losses in underlying assets such as mortgages.