Millennium Loses 2.1% in July as AI Rout Hits Hedge Funds

Millennium Management's flagship fund fell 2.1% in July, trimming its year-to-date gain to 8.2%, as a selloff in AI and semiconductor stocks punished multi-strategy managers while systematic quant funds advanced.

The decline, reported by people familiar with the matter, left North Rock, a multi-manager equity fund, down 2.1% for the month with a year-to-date gain of 4.8%, while multi-strategy fund LMR slipped 0.48% to hold a 6% return for 2026.

The damage was concentrated in equity books exposed to AI and chipmakers. The $7.2 billion Quantedge fund rose 7.8% in July, lifting its year-to-date return to 34.6%, while macro fund Pharo Macro gained 0.23% to reach 9.9% for the year. The sector's earlier slide narrowed after Situational Awareness, the AI-focused fund run by Leopold Aschenbrenner, was forced to sell most of its public stock positions to Citadel Advisors under margin-call pressure.

The divergence carries implications for institutional capital allocation. A rapid rise in oil prices stoked inflation concerns that pushed 30-year Treasury yields higher, pressuring fixed-income books and testing cross-asset portfolios. If AI-equity volatility persists into the second half, multi-strategy managers may face renewed redemption pressure, while systematic strategies that thrived in July could attract fresh inflows.

Leverage Turns a Winning AI Thesis Into a Forced Sale

Aschenbrenner's Situational Awareness fund financed its public equity portfolio with as much as four times leverage. As AI stocks corrected, margin requirements forced the liquidation of those positions, and the fund sold its entire public portfolio to Citadel to satisfy outstanding margin obligations. The fund still shows an 80% year-to-date gain because a quarter of its net asset value sat in Anthropic, which appreciated 620% after new financing rounds — a contribution of roughly +155% that offset the near -75% hit from the liquidated public book.

The episode shows how fund-level returns can mask vastly different outcomes underneath. Public shares fluctuate every second markets are open, while private companies like Anthropic receive updated valuations only when financing rounds occur, so reported net asset values can blend realized losses with unrealized gains.

Oil and Yields Test Cross-Asset Books

Beyond equities, the July backdrop was shaped by the link between commodities and fixed income. A surge in crude prices fed inflation concerns, driving 30-year Treasury yields higher and weighing on fixed-income assets. That dynamic tested the overall allocation of cross-asset portfolios, which had to absorb simultaneous pressure in both equity and bond books.

The last time AI and semiconductor names saw a comparable drawdown, in the June tech rout, leveraged ETFs magnified losses across the sector. This time the pain was concentrated in hedge funds that borrowed to bet heavily on AI, while quant strategies trading across asset classes sidestepped the damage.

For allocators, the July results argue for scrutiny of how returns are generated, not just their size. Multi-strategy funds that delivered single-digit gains while absorbing AI volatility may face questions about leverage and concentration, while systematic funds with double-digit returns could see inflows accelerate. Millennium's next monthly update, due in early September, will show whether the August rebound in chip stocks — the KOSPI jumped a record 18% in one session — restores some of the lost ground.

This article is for informational purposes only and does not constitute investment advice.