Jane Street Lost $15 Billion in July, First Down Month in a Decade

Jane Street, one of the most profitable trading firms on Wall Street, just booked its first monthly loss in roughly a decade. The firm posted roughly $15 billion of losses in July as AI-focused hedge fund Situational Awareness swooned and dragged down asset prices across equity markets.

What went wrong

Jane Street, which invests in Situational Awareness and directly invests in AI ventures, suffered a rare and severe downturn amid volatile stock markets. The company’s investment in the hedge fund, as well as wrong-way bets in Asian equity markets, drove part of the losses.

Situational Awareness was ultimately forced to liquidate public stock positions on a large scale and sold most of its equity portfolio to Citadel, owned by Ken Griffin. The fund’s collapse directly hit investors including Jane Street.

Situational Awareness lost roughly $35 billion between the start of July and the end of the month, and Jane Street’s positions were effectively a carbon copy of what Leopold Aschenbrenner held on his book at the time of the handover to Citadel.

Still a record year overall

The firm has generated more than $40 billion of net trading revenue so far this year, more than it did in all of 2025 when it set a Wall Street record. In other words, one bruising month has not undone the year, but it does raise questions about leverage and concentration in AI-adjacent names.

“July was a bad month,” Turner Batty, a Jane Street partner, said in an internal note. Batty added that the firm has closed a significant portion of its risk in the specific areas it lost on in July and has also reduced risk-taking in other strategies.

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The debt refinancing angle

Jane Street was rattled by Situational Awareness and the equity market turmoil as it was preparing to issue $14.6 billion of bonds this week to overhaul its debt load.

The plan is to issue new private debt, repay existing public bonds and floating-rate loans, and rearrange about $11 billion of its capital structure into the hands of private investors, with Pimco, Capital Group, and Fidelity participating in the new debt financing.

Why it matters for the market

Jane Street invested early in some of AI’s biggest players, including Anthropic and CoreWeave, adding to profits from its business handling thousands of trades within milliseconds. When a market maker of this size takes a $15 billion hit in a single month, it points to how crowded the AI momentum trade had become, and how quickly liquidity can vanish when everyone leans the same way.

Traders should watch for follow-on de-risking across quant and market-making desks that ran similar exposures. See other market-moving stories in market news.

Options market and stocks to watch

CoreWeave (CRWV): A direct Jane Street investment. Watch for flow reacting to any read-through on AI infrastructure positioning.

Nvidia (NVDA): The center of the AI momentum trade. Watch for how options positioning shifts if concentrated funds continue to de-risk.

Microsoft (MSFT) and Alphabet (GOOGL): Mega-cap AI names that tend to move with hedge fund rebalancing. Watch flow for signs of forced selling or dip-buying.

JPMorgan (JPM): Leading the Jane Street debt refinancing. Watch for any commentary tied to private credit demand for the deal.

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