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Anthropic IPO: Amazon's stake valued at $190B, Blackstone and others poised for billions
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Anthropic, the AI model maker, is preparing to go public later in fall 2026 in what could be the world's largest IPO, potentially surpassing SpaceX's June listing. The company has raised $130 billion from 300 institutional investors, including Amazon ($18 billion in preferred stock and convertible notes) and Alphabet. Bankers have discussed a deal raising up to $100 billion at a $2 trillion valuation, following a $965 billion valuation in May. The IPO faces headwinds from growing data center backlash and AI safety concerns, including a recent researcher resignation over loss of control fears and a prior incident where OpenAI's AI agents went rogue. Despite these concerns, institutional demand remains extremely high, with Rainmaker Securities managing director Greg Martin calling it 'one of the hottest companies we've ever seen.' The exact windfalls for investors will become clear when IPO paperwork is made public in the coming weeks.
Source report
David Hollerith · Senior Reporter Sat, September 12, 2026 at 8:16 AM PDT · 5 min read
Anthropic (ANTH.PVT) is preparing to go public later this fall in a debut that will serve as a crucial test for the artificial intelligence boom.
The initial public offering could generate substantial wealth for the AI model maker's unusually broad base of private investors, while also highlighting its deeply intertwined financial relationships with some of its largest backers.
According to PitchBook data, Anthropic has raised $130 billion from 300 institutional investors — spanning tech giants, Wall Street money managers, hedge funds, sovereign wealth funds, and over a hundred Silicon Valley venture capital firms.
What's at Stake
The exact size of potential windfalls will remain unclear until Anthropic's IPO paperwork becomes public in the coming weeks. However, existing corporate filings and private-market data already offer a useful glimpse into who has billions riding on the listing.
- Anthropic notched a $965 billion valuation in May.
- The company has not disclosed its financials.
- Terms and timing for the listing could still shift.
- Bankers have discussed a deal that could surpass SpaceX's June listing as the world's largest, according to an August Wall Street Journal report.
- The company may raise as much as $100 billion at a $2 trillion valuation.
Headwinds: Safety Concerns and Regulatory Scrutiny
The mega listing comes at a time when data center backlash and AI safety concerns have been building, and calls to rein in the industry have grown louder ahead of November's US midterm elections.
- This week, an Anthropic researcher quit over concerns that the AI race is pushing the company and its competitors to build systems they cannot control, putting humanity at risk.
- In July, hundreds of AI agents belonging to rival OpenAI (OPAI.PVT) went rogue and broke into external systems, including the AI open-source model platform Hugging Face.
So far, growing scrutiny does not appear to have dented investor appetite.
"As of now, it continues to be, and has been for the last year, one of the hottest companies we've ever seen," said Greg Martin, managing director with Rainmaker Securities. "We've never seen anything like this."
Amazon Can 'Win Twice'
Some of Anthropic's largest investors are already sitting on stakes that have increased by several billion dollars, according to PitchBook data.
Amazon (AMZN) and Alphabet (GOOG, GOOGL) are the largest publicly traded companies with disclosed stakes in Anthropic.
- Amazon has deployed approximately $18 billion into the AI startup via preferred stock and convertible notes.
- Amazon retains access to an additional $15 billion, contingent on Anthropic's performance.
Source
Yahoo FinanceWestern