Summary · why it matters
AI-focused hedge fund Situational Awareness, founded by Leopold Aschenbrenner, was forced into a rapid fire sale to Citadel after a margin call triggered by a sharp downturn in its leveraged AI bets. The fund had soared from a couple hundred million to 20 billion dollars in assets, up 440 percent in the first half of 2026, but heavy borrowing amplified losses when positions in companies like Micron, SK Hynix, and CoreWeave fell and short bets against software companies turned unfavorable. Banks demanded repayment, leading to a negotiated sale of public holdings to Citadel, though Aschenbrenner retained private assets including a 5-billion-dollar stake in Anthropic. The episode underscores the dangers of leverage, as a 25 percent decline in an 80-billion-dollar portfolio could wipe out equity entirely, and highlights how other hedge funds may pile on when a crowded trade unravels.