Situational Awareness LP, the artificial-intelligence hedge fund founded by 25-year-old former OpenAI researcher Leopold Aschenbrenner, was forced to sell the majority of its public equity portfolio to Ken Griffin's Citadel on Wednesday, 30 July 2026, after margin calls from its prime brokers, CNBC reported. The fund had grown to as much as $45 billion at its peak and posted a net return of roughly 439% through the end of June 2026 — one of the fastest ascents in modern hedge fund history, and now one of the fastest unwinds.
The trigger was leverage. Situational Awareness ran close to four times leverage on a concentrated book of AI infrastructure and semiconductor longs, funded through Goldman Sachs, JPMorgan Chase and Bank of America. When those positions fell between 35% and 47% during July's AI equity selloff — while the fund's short positions in software companies moved sharply against it — the equity supporting the borrowed money was wiped out.
Key Highlights
- Citadel, Griffin's $71 billion firm, bought the bulk of the public book in a single transaction on 30 July 2026. Millennium and Jane Street also bid.
- Margin calls came from three prime brokers: Goldman Sachs, JPMorgan Chase and Bank of America.
- The fund's public portfolio fell over 30% in a month; individual positions including SK Hynix, SanDisk, Bloom Energy and Nebius Group dropped 35% to 47%.
- Short positions in software names such as Adobe rose against the fund, compounding losses on both sides of the book.
- Assets under management fell from a peak near $45 billion to roughly $10 billion.
- The private book was not sold. It includes a stake in Anthropic valued at about $5 billion, plus positions in AI chipmaker MatX and data center startup Fluidstack.
Details
Aschenbrenner sent investors a letter on Friday, 24 July, describing the AI selloff as offering "some of the most attractive opportunities since early 2025" and inviting fresh capital commitments by 1 August. Six days later, the fund had liquidated its public book entirely.
The intervening three trading days were decisive. Several of the fund's largest positions fell 30% or more in that window, and with nearly 4x gearing there was no cushion left to post against the calls. Selling the whole book to a single counterparty — rather than unwinding into a falling market — let the fund exit in one trade, but almost certainly at a discount.
Aschenbrenner's background makes the outcome unusual. He enrolled at Columbia at 15 and graduated valedictorian at 19, joined OpenAI's superalignment team in 2023, and was dismissed in 2024 over what the company called improper disclosure of information. He then published the "Situational Awareness" essay series arguing that artificial general intelligence was arriving faster than markets had priced in, and launched a fund on that thesis with backing from Stripe cofounders Patrick and John Collison, Daniel Gross and Nat Friedman. He had no professional investment experience before the launch.
Impact
The unwind matters beyond one fund. Situational Awareness was among the most concentrated leveraged buyers of AI infrastructure equities, and its forced exit added supply into an already falling market. Analysts have flagged hedge fund leverage as a distinct risk channel for AI stocks — separate from the fundamental questions about capex returns — because deleveraging is mechanical and indifferent to valuation.
The dispersion inside the trade is also instructive. The fund was long AI hardware and short software on the thesis that models would commoditise application layers. In July, both sides moved the wrong way at once, which is the specific failure mode that leverage cannot survive.
At the same time, the scale should be kept in proportion. Even levered, roughly $20 billion of positions is a small fraction of the market capitalisation of the AI complex, and the sale is better read as a symptom of the July drawdown than its cause.
Background
The fund launched in 2024 with under $1 billion and compounded aggressively through 2025 and the first half of 2026, drawing attention across both Silicon Valley and Wall Street for returns that few multi-strategy firms could match. Its growth from $225 million to more than $20 billion in roughly two years made Aschenbrenner one of the most closely watched figures in AI investing, and its thesis — that the buildout of compute would outrun everything else — was widely copied.
What's Next
Situational Awareness will operate going forward as a private investment vehicle rather than a leveraged public markets fund. Its remaining value is concentrated in the Anthropic position; Anthropic was last valued at $965 billion in its Series H round in May 2026 and is expected to list publicly in October 2026, which could revalue the stake substantially. Aschenbrenner is reportedly seeking fresh capital commitments beginning 1 August 2026.
For the wider market, the open question is how much leveraged AI exposure remains elsewhere. Situational Awareness was the most visible example, not necessarily the only one.
Source: CNBC