Jane Street reports $15B loss in July tied to AI hedge fund exposure

Jane Street, the quantitative trading powerhouse that has quietly become one of Wall Street’s most profitable firms, lost approximately $15 billion in July. It marks the firm’s first monthly loss in nearly a decade.

The culprit: a deep exposure to Situational Awareness, an AI-focused hedge fund that suffered roughly $35 billion in losses during the same period.

How a decade-long streak ended

In an internal memo, executives described July as a “bad month.” The memo also signaled a strategic shift. Leadership indicated the firm would reduce risk in the trading strategies most affected by the Situational Awareness fallout.

The timing adds another layer of complexity. Jane Street was in the middle of a significant debt restructuring during July, including a multi-billion dollar bond issuance conducted through JPMorgan.

The bigger picture is almost absurdly strong

Despite losing $15 billion in a single month, Jane Street’s year is still extraordinary. By early-to-mid August, the firm’s year-to-date net trading revenues had topped $40 billion. Jane Street’s entire net revenue for the full year of 2025 was $39.6 billion. So in roughly seven and a half months of 2026, even after absorbing a historic loss, the firm had already surpassed last year’s total.

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