Fed and BoE Query Banks on Exposures to Jane Street and Citadel After July AI Fund Unwind

In July the leveraged AI infrastructure fund Situational Awareness unwound its public book after losses on both long and short legs, with Citadel acquiring the portfolio at a 10 percent discount. Jane Street recorded a $15 billion monthly loss on overlapping momentum positions in names including Micron and Broadcom. Goldman Sachs had earned over $200 million in prime brokerage fees from financing the fund through total return swaps at roughly 4x leverage.

Regulators are now seeking three categories of information: the firms' stated risk appetite toward large market makers, the evolution of bank exposures during the trading day, and the effectiveness of existing margin controls. This follows documented patterns in which prime brokers facilitated rapid position transfers while the underlying volatility in AI-related equities exceeded prior stress scenarios.

The inquiries coincide with central banks' broader interest in concentrated counterparty risk within equity derivatives and securities financing. Both the Fed and PRA declined comment, consistent with their practice of conducting such reviews through supervisory channels rather than public statements. No new rules have been proposed.

Future oversight may focus on leverage caps or real-time reporting requirements for exposures above defined thresholds, particularly where single-counterparty concentrations intersect with sector-specific momentum trades.