Jane Street Posts $15 Billion July Loss, First Monthly Decline in a Decade
AI hedge fund turmoil and misfired Asian equity bets handed the record-setting market maker its worst month in roughly ten years, just as it moves to refinance $11 billion of debt.
Jane Street lost approximately $15 billion in July, marking its first negative month in about a decade, after an AI-focused hedge fund in its portfolio collapsed and separate bets in Asian equities moved against the firm, according to a person familiar with the matter.
The market maker's stake in Situational Awareness, an AI-focused hedge fund, was a primary driver. That fund faced margin calls in July as its artificial-intelligence positions deteriorated, ultimately striking a deal with Ken Griffin's Citadel to unload a large portion of its public equity holdings. Jane Street also took losses on wrong-way positions in Asian equity markets, the person said.
"July was a bad month," Jane Street partner Turner Batty acknowledged in an internal note to staff.
Timing meets a $14.6 billion bond deal
The loss landed at an awkward moment. Jane Street was in the process of issuing $14.6 billion of bonds this week to replace floating-rate loans and restructure its roughly $11 billion capital stack. JPMorgan Chase led the fixed-rate deal across three tranches, with Pacific Investment Management Co., Capital Group and Fidelity among the buyers, according to filings.
The proceeds are earmarked for technology infrastructure and expansion of trading strategies. The firm disclosed the Situational Awareness impact to investors as part of the refinancing process, the person said.
A stumble inside a record year
Despite the July hit, Jane Street has generated more than $40 billion in net trading revenue year to date, already exceeding the $39.6 billion it booked across all of 2025, a figure that surpassed the trading divisions of Goldman Sachs and JPMorgan. That 2025 total included gains from long-term investments alongside the firm's core business of executing thousands of trades within milliseconds.
Jane Street said its Situational Awareness position remains flat for the year and is still profitable over the life of the investment. The firm also holds early stakes in Anthropic and CoreWeave.
Risk trimmed, not abandoned
Batty told staff that the firm has closed a significant portion of the positions responsible for July's losses and reduced exposure in other strategies that contributed to volatility.
"Despite the large year-to-date increase in trading capital, the recency of these losses has caused us to locally be more selective about risk," Batty wrote. He added that current positions appear appropriate for the firm's risk tolerance and that short-horizon trading strategies "seem more profitable than ever" amid strong market volumes.
For investors watching AI-linked volatility spill beyond equity indices into hedge funds and market makers, Jane Street's July is a reminder that even the most capitalised, technologically sophisticated trading firms are not insulated when a crowded theme reverses sharply.
