The Federal Reserve and Bank of England have initiated a joint investigation into global banks’ exposure to large trading firms, following significant losses suffered by proprietary trading firm Jane Street in July. The inquiry comes after turmoil at a hedge fund triggered $15 billion in losses at the trading firm, raising concerns about systemic risk across the financial system.

According to a report by the Financial Times, both central banks have asked major financial institutions to provide detailed information about their relationships with prominent trading firms. The investigation focuses on risk management practices, exposure levels throughout trading days, and the effectiveness of existing control mechanisms, according to people familiar with the matter.

The Bank of England declined to comment on the inquiry when contacted by Reuters. Jane Street and the US Federal Reserve did not immediately respond to requests for comment outside of business hours. Reuters could not independently verify all details of the Financial Times report.

AI-Focused Hedge Fund Collapse Triggers Market Turmoil

The investigation stems from the near-collapse of the Situational Awareness fund, an AI-focused investment vehicle run by former OpenAI researcher Leopold Aschenbrenner. The fund faced a forced liquidation after a sharp selloff in AI and chip stocks swept through markets in July, exposing vulnerabilities in highly leveraged positions.

Situational Awareness was compelled to sell the majority of its public equities portfolio to Citadel Securities as part of the emergency liquidation. The rapid unwind occurred during a period of extreme volatility in technology stocks, particularly those linked to artificial intelligence development and semiconductor manufacturing.

Jane Street suffered substantial losses during the July turmoil, with approximately $15 billion in red ink stemming primarily from its investment in the hedge fund and other technology holdings. The magnitude of these losses has prompted regulators to examine whether similar exposures exist elsewhere in the financial system and whether current risk controls are adequate.

Regulatory Focus on Risk Appetite and Control Mechanisms

The central banks are seeking comprehensive information on several critical aspects of trading firm operations and bank relationships. Regulators want to understand how trading firms’ risk appetite evolved during the volatile July period, according to sources cited in the Financial Times report.

Central to the inquiry is how banks’ exposure to these trading firms changed throughout individual trading days, particularly during periods of market stress. Officials are examining whether existing monitoring systems provided adequate real-time visibility into growing risk concentrations as market conditions deteriorated.

The investigation also scrutinizes how risk controls operated during the crisis period. Regulators want to determine whether existing safeguards functioned as intended or whether gaps in oversight allowed exposures to grow beyond prudent levels before triggering intervention.

SEC Launches Parallel Investigation Into Wall Street Banks

The Federal Reserve and Bank of England inquiry runs parallel to a separate investigation launched by the US Securities and Exchange Commission last month. The SEC subpoenaed multiple Wall Street banks, including Goldman Sachs, JPMorgan, Citigroup, and Bank of America.

The SEC investigation focuses specifically on Situational Awareness fund’s trading activity and use of leverage in the period leading up to its near-collapse. Regulators are examining the trades that triggered margin calls, forcing the fund’s liquidation, as well as reviewing communications between the fund and its lenders during the crisis.

The dual investigations by banking and securities regulators signal heightened concern about interconnections between hedge funds, proprietary trading firms, and traditional banks. Officials worry that opaque relationships and concentrated exposures could amplify market stress during future periods of volatility.

Broader Implications for Financial System Oversight

The joint central bank inquiry represents a significant escalation in regulatory scrutiny of non-bank financial institutions and their relationships with traditional lenders. The investigation suggests regulators believe current oversight may not fully capture risks posed by highly leveraged trading strategies and concentrated positions in volatile sectors like technology.

Market observers note that the timing and coordination between the Federal Reserve and Bank of England indicate concerns about potential cross-border contagion if similar exposures exist at institutions operating in multiple jurisdictions. The July losses occurred during a global selloff in AI-related stocks, affecting markets on both sides of the Atlantic.

Financial institutions may face enhanced reporting requirements and stricter limits on exposures to proprietary trading firms and hedge funds as a result of these investigations. Banks could be required to provide more frequent updates on their relationships with these entities and demonstrate more robust stress-testing of potential losses during market disruptions.

The inquiries also raise questions about leverage limits and margin requirements for hedge funds investing in volatile sectors. The rapid collapse of Situational Awareness suggests existing safeguards may have been insufficient to prevent the buildup of concentrated risks in a single thematic investment strategy focused on artificial intelligence.

Technology Sector Volatility Adds Urgency to Review

The July selloff that triggered the crisis underscored the potential for rapid reversals in high-momentum technology stocks. AI and semiconductor stocks had experienced extraordinary gains in preceding months, attracting substantial capital from hedge funds and other leveraged investors seeking to capitalize on the artificial intelligence boom.

When sentiment shifted abruptly in July, the concentrated nature of these positions amplified selling pressure, creating a feedback loop that forced additional liquidations. Jane Street‘s $15 billion loss illustrates how quickly paper profits can evaporate when highly leveraged positions unwind simultaneously.

The investigations are expected to continue for several months as regulators gather information from multiple institutions and analyze the complex web of relationships between banks, trading firms, and hedge funds. Any resulting rule changes or enhanced oversight requirements would likely take effect in 2027 or later, following public comment periods and coordination between US and UK authorities.

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