Jane Street Takes $15 Billion July Loss on AI-Focused Situational Awareness and Tech Selloff

How Jane Street's AI and Tech Bets Produced a $15 Billion July Loss

Jane Street, the privately held Wall Street market maker, lost roughly $15 billion in July as AI-related equity positions that had driven earlier gains reversed sharply. The losses stemmed from its investment in Situational Awareness, an AI-focused hedge fund run by former OpenAI researcher Leopold Aschenbrenner, and from long positions in other technology and Asian stocks, according to Reuters, citing two people familiar with the matter and an internal memo. Despite the hit, Jane Street has generated more than $40 billion in trading revenue so far this year, already above the $39.6 billion it recorded for all of 2025.

The July decline pushed the firm to its first negative month for trading revenue since 2016. Executives told staff that revenue was about 25% below its late-June peak and called July a "bad month." The internal note said Jane Street held a large stake in Situational Awareness that grew substantially after strong first-half performance, but the fund's sharp reversal left that investment roughly break-even for the year while still profitable over the lifetime of the position.

The trigger was a broad selloff in AI and technology shares. Situational Awareness was forced to sell the majority of its equity portfolio to Citadel in an emergency transaction after margin calls. Jane Street said its standard protection of buying put options was less effective because the losses were spread over the month rather than occurring in a single sharp drop. The firm also lost money on long positions in non-AI Asian equities that had outperformed earlier in the year.

Jane Street, founded in 2000, has about 3,500 employees and provides liquidity across ETFs, equities, bonds, options, commodities and currencies on more than 200 trading platforms. It has no external investors. Management said the firm has since reduced risk in the sectors that caused the losses and moderated risk appetite in other strategies, while short-term trading strategies remain strong and "more profitable than ever."

Behind Jane Street's AI Exposure and Its Post-Loss Risk Reset

Where the AI Selloff Hit Jane Street

The losses were concentrated in the same AI-linked equity book that powered Jane Street's second-quarter outperformance. The internal memo says several of the largest memory and semiconductor names fell around 50% in July. That matters because the firm's usual protection against sharp declines is buying put options, a strategy designed for sudden market shocks. Since the AI retreat was spread across the month, the hedges did not fully offset the deterioration. This suggests a risk framework that works well in abrupt crash scenarios was less suited to a grinding, sector-specific unwind.

Situational Awareness and the Citadel Rescue

Jane Street's loss was magnified by its investment in Situational Awareness, the AI-focused hedge fund led by Leopold Aschenbrenner. After a strong first half, the fund was hit by falling AI equities and margin calls, forcing it to sell the bulk of its stock portfolio to Ken Griffin's Citadel. For Jane Street, an investor in the fund, the reversal turned a large year-to-date gain into a roughly break-even position. The episode shows how quickly external AI fund exposure can transmit losses back to a trading firm, even when the position remains profitable over its full life.

What the Loss Means for Jane Street's Risk Appetite

In response, Jane Street says it has exited significant risk in the sectors where it lost money and reduced risk appetite in other strategies. Management told employees the firm is now being "more selective with risk" despite a large increase in trading capital this year. That July was the first negative revenue month since 2016 indicates the scale of the AI unwind, not a structural breakdown in the market-making business. The memo's assertion that short-term strategies are "more profitable than ever" suggests the core liquidity business remains intact, while longer-horizon directional risk is being restricted.

What Jane Street's AI Loss Means for Trading Desks and Counterparties

For trading desks and counterparties with exposure to Jane Street, the loss carries several practical implications.

• Expect less aggressive quoting from Jane Street in AI, semiconductor and Asian equity sectors because the firm says it has reduced risk in the areas that caused the July losses. Spreads in those names may widen until flows normalize.
• Do not read the loss as a collapse of Jane Street's liquidity franchise: year-to-date revenue exceeds $40 billion and management describes short-term strategies as more profitable than ever.
• For investors and allocators in AI-focused hedge funds, Situational Awareness's emergency sale to Citadel after margin calls highlights concentrated drawdown and funding risk even inside AI strategies that performed strongly in the first half.
• Jane Street employees should expect a more cautious risk posture into year-end as management rebalances risk appetite, which may affect desk-level capacity and performance.