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Star AI investor Leopold Aschenbrenner is unwinding trades after steep losses: CNBC

The hedge fund is selling public holdings and private stakes after AI losses and software shorts moved against it, with prime brokers helping manage margin pressure.

  • On Wednesday, hedge fund Situational Awareness, led by 25-year-old founder Leopold Aschenbrenner, sold a majority of its public equity holdings to Ken Griffin's $71 billion firm, Citadel, after facing steep market losses.
  • Margin calls forced the liquidation after a leveraged strategy betting on the artificial intelligence boom faltered, causing holdings in Nebius and Sandisk to tumble sharply in recent weeks.
  • Millennium Management and Jane Street Group both bid for the portfolio but ultimately did not participate, leaving Citadel to execute the purchase through one enormous trade.
  • Situational Awareness will continue as a private investment vehicle, retaining its significant stake in Anthropic PBC, which was last valued at $965 billion in a May Series H funding round.
  • ZeroHedge dubbed the collapse "Archegos 2.0," comparing it to a family office that imploded on hidden leverage, though Aschenbrenner said the fund had "not been immune" to the recent sell-off.
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Ken Griffin's manager, Citadel, intervened to purchase a large portion of the stock portfolio traded on the Stock Exchange of Situational Awareness — valued at $16 billion — after Leopold Aschenbrenner's investment company was taken by surprise by the wave of sales of artificial intelligence (AI) shares. Exclusive material for subscribers. To have full access, access the link of the subject and register.

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Hedgeweek broke the news on Thursday, July 30, 2026.
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