HedgeCo.Net — Jane Street took a roughly $15 billion hit in July, its first negative month of trading revenue since 2016, after an AI-stock reversal ran through both the firm’s own technology book and its stake in Situational Awareness, the hedge fund run by former OpenAI researcher Leopold Aschenbrenner. Reuters, citing two people familiar with the matter and an internal note, said the drawdown left year-to-date trading revenue still above $40 billion, more than the $39.6 billion Jane Street generated in all of 2025. That is a market-maker P&L story, not a 2-and-20 track record. It is still the allocator’s crowding problem in a different wrapper.
Situational Awareness had been a first-half winner. Jane Street’s note, as seen by Reuters, said the investment “became large by performing well in the first half of the year,” then suffered a large drawdown that left the stake about flat on the year, though still up over the full holding period. The fund sold the bulk of its public-equity portfolio in a distressed transaction with Citadel after margin calls, according to the same reporting. Jane Street, which has about 3,500 employees, was founded in 2000, and has not taken outside capital, was not a bystander. It was an LP in an AI specialist whose book overlapped the same factor the trading firm was making markets in.
The hedges failed for a structural reason. The firm said it typically buys puts against sharp shocks. July’s AI losses were “relatively spread out throughout the month,” so those short-term puts provided little help. The note added that Jane Street “largely lost on the same portfolio of trades that had strong outperformance in the second quarter,” with several of the largest memory and semiconductor names down around 50%, and that non-AI Asia longs that had worked in the second quarter reversed as well. Revenue was down roughly 25% from the end-June peak.
Management has already cut risk. The note said the firm closed a significant portion of risk in the areas that lost money in July, pulled back in other strategies, and is “more selective about risk” even after a large year-to-date increase in trading capital. Positions, it said, “currently seem appropriate for our present risk tolerance,” while short-horizon market-making “seems more profitable than ever.”
For allocators the second-order question is not whether Jane Street survives a down month. It is how much of the AI complex was the same trade wearing different hats: a market-maker’s inventory, a specialist hedge fund’s longs, and a pod-shop factor book. When the unwind is gradual, the put that was sold as crash insurance does not pay. When the specialist fund meets a margin call, the bid is a rival platform. LPs who thought they were diversified across “trading,” “AI hedge,” and “tech long/short” should ask how much of July was one crowded factor, marked in three places.