Trading giant Jane Street posted a roughly $15 billion loss in July, its first negative month since 2016, as a sharp selloff in AI-exposed stocks tore through positions tied to the hedge fund Situational Awareness. The firm disclosed the loss to lenders as part of a deal to shift an $11 billion pile of its public debt to private investors, a move that put a hard number on losses that had otherwise stayed behind closed doors.
The damage traces back to Situational Awareness, a fund run by former OpenAI researcher Leopold Aschenbrenner. As the AI selloff triggered margin calls, the fund was forced into a fire sale of the bulk of its stock portfolio to billionaire Ken Griffin's Citadel, with its assets plunging from a $45 billion peak to roughly $10 billion in a single month. Jane Street's own investment in the fund, compounded by wrong-way bets in Asian equity markets, drove a large share of July's losses.
How Deep the AI Pullback Cut
The scale of the drawdown reflects just how concentrated the AI trade had become across markets. Several of the largest memory and semiconductor stocks fell by around 50% during July, a decline sharp enough to erase months of gains built up during the sector's earlier rally. Jane Street's revenue fell 25% from its peak at the end of June as a direct result.
Related: SanDisk's AI Memory Rally Spills Into Leveraged ETF Demand
A Setback, Not a Collapse
Despite the size of the loss, Jane Street's underlying business remains large enough to absorb it. The firm has generated more than $40 billion in net trading revenue so far in 2026 even after the July decline, a figure that already exceeds the roughly $40 billion it produced across the entirety of 2025, according to Bloomberg's reporting on the losses. That context matters for how markets read the episode: a record year derailed by one bad month, rather than a firm in genuine distress — though the speed and scale of Situational Awareness's collapse is likely to draw scrutiny to how concentrated AI-stock exposure had become across Wall Street's trading desks.
