Leopold Aschenbrenner's hedge fund, Situational Awareness, just made a $400 million bet on a company that is not listed on public markets, according to anonymous people with knowledge of the deal.
The deal closed on Tuesday. The fund did not say which of its existing private holdings got the money, and a spokesperson declined to comment.
The privately held company had already received $100 million from the fund in the previous month. So this is an add-on bet, not a brand-new idea. The new money brings Situational Awareness's total investment in that unnamed company to $500 million in about a month. The fund is also far more concentrated after the crisis: with most of its public stocks sold to Citadel, the remaining assets are tied heavily to private technology companies such as Anthropic, Fluidstack and MatX.
The new money comes barely a week after the fund's public tech stocks lost value in a hurry. That triggered margin calls, which happen when lenders demand more cash because the investments used to secure a loan have lost value.
Those calls nearly sank Situational Awareness. To raise cash, Aschenbrenner briefly considered selling private stakes in Anthropic, Fluidstack and MatX.
Instead, he reached an agreement to sell most of his public portfolio to Citadel, the firm run by Ken Griffin. That let him repay lenders and keep his private holdings.
Those private stakes were the part of the fund he chose to protect. The public stocks went to Citadel, while the positions in Anthropic, Fluidstack and MatX remained in place. That left the fund's future tied more directly to private technology companies than to public markets.
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By Thursday, the fund was much smaller, with assets of about $10 billion, down from $45 billion in early July. In a Friday letter, Aschenbrenner wrote, "We took the steps that were necessary to fight another day."
He added that the fund has to be built to withstand losses and keep going, and that making that a priority is the key lesson he intends to take from the crisis. Almost all of his personal capital is still in the fund, he wrote.
Aschenbrenner has also said he wants to demonstrate that the month's turmoil improved his decision-making.
Most of the fund's money comes from wealthy individuals and family investment offices in the San Francisco Bay Area, an unusual setup for a fund of its size. The Wall Street Journal reported that backers include Neil Mehta, founder of Greenoaks, and Gaurav Kapadia, founder of XN.
They also include Feroz Dewan, who used to lead Tiger Global Management's public-equities unit, and Dan Sundheim, founder of D1 Capital Partners.
As of August 5, 2026, no major investor withdrawals had surfaced.
The same week also had a personal side. Aschenbrenner got married Saturday at a Tuscany-inspired chateau in Carmel Valley, California, and his wife is chief of staff to Anthropic's CEO.
There was no honeymoon. Instead, he promised to make himself available this week for individual calls with any investor who requested one.
One local neighbor did not know about the wedding. Omdev Elzafon, 27, who co-owns The American Art Gallery in Carmel-by-the-Sea, said he did not know about the wedding and expressed sympathy after looking the fund up online.
"Tough time to get married," he said, adding, "Man, that's a bummer for him."
The $400 million check belongs to a different investing world. Private-company bets like this come with a risk level that most portfolios never touch.
The bigger lesson for your portfolio is about borrowed money.
The people with money in his fund will be watching to see if that turns out to be true. For everyone else, the month is a useful reminder that big numbers can move fast when bets are made with borrowed cash.
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