Young Hedge Fund Star's Fall Highlights Key Investment Lessons
WHO:
Business Insider - Aschenbrenner got married to the chief of staff for Anthropic's CEO, Dario Amodei.
Entrepreneur - Leopold Aschenbrenner, a 24-year-old hedge fund manager.
eFinancialCareers - Ken Griffin, 57, and his team at Citadel, including Pablo Salame, Gerald Beeson, Shawn Fagan, and Perry Vais.
Business Insider - Patrick and John Collison, founders of Stripe, and Izzy Englander, 77, of Millennium.
WHAT:
eFinancialCareers - Citadel's Wellington Fund was reportedly up less than 50 basis points for the month through to July 24.
eFinancialCareers - Aschenbrenner still has $10 billion of assets under management.
Business Insider - Aschenbrenner's private investment in Anthropic was last valued at nearly $1 trillion.
Entrepreneur - Aschenbrenner raised $100 million to launch his hedge fund in 2024.
Entrepreneur - Aschenbrenner sold $20 billion in stock to survive a financial crisis.
eFinancialCareers - Citadel acquired most of Aschenbrenner's public investments, which were valued at $16 billion.
Business Insider - Aschenbrenner's fund, Situational Awareness, grew from a few hundred million dollars to $45 billion in less than two years.
Business Insider - At one point, the fund was up 1,000% after fees since inception.
eFinancialCareers - CoreWeave and SanDisk, two of Aschenbrenner's largest investments, fell nearly 60%.
eFinancialCareers - After Citadel's intervention, CoreWeave rebounded 21% and SanDisk rebounded 26%.
Business Insider - Aschenbrenner reportedly leveraged his investments 3-4 times without effective hedges.
WHERE:
eFinancialCareers - Aschenbrenner's hedge fund is based in San Francisco, specifically in the "Nob Hill" neighborhood.
WHEN:
eFinancialCareers - Aschenbrenner's hedge fund was launched in 2024.
Business Insider - Aschenbrenner's wedding occurred during the crisis, with guests arriving as discussions with Citadel were ongoing.
WHY:
Business Insider - Aschenbrenner's fund faced issues due to high leverage and concentration in too few positions, leading to margin calls from banks.
HOW:
eFinancialCareers - Aschenbrenner's fund employed a strategy of borrowing money to grow positions while shorting stocks perceived as AI laggards, which led to significant losses when the market turned.
Business Insider - Aschenbrenner's fund employed a strategy of borrowing money to grow positions while shorting stocks perceived as AI laggards.
(UPDATED August 4, 2026 00:05 UTC)
Aschenbrenner recently tied the knot with Dario Amodei, the chief of staff for Anthropic's CEO. Despite facing challenges, Aschenbrenner still manages $10 billion in assets, although his Wellington Fund was up less than 50 basis points for the month through to July 24. His private investment in Anthropic was last valued at nearly $1 trillion, but the fund's strategy of borrowing to expand positions while shorting underperforming AI stocks resulted in significant losses when the market shifted.
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(UPDATED August 3, 2026 18:40 UTC)
Leopold Aschenbrenner, a 24-year-old hedge fund manager based in San Francisco's Nob Hill, raised $100 million to launch his fund, Situational Awareness, in 2024, which astonishingly grew to $45 billion in less than two years. However, the fund faced significant challenges due to high leverage and concentrated positions, leading to margin calls from banks, and at one point, Aschenbrenner reportedly leveraged his investments three to four times without effective hedges. Following Citadel's acquisition of most of Aschenbrenner's public investments, which were valued at $16 billion, two of his largest investments, CoreWeave and SanDisk, rebounded significantly after experiencing steep declines.