Anthropic has filed its S-1 prospectus with the SEC, confirming that all seven co-founders intend to sell 3,378,378 shares each in the upcoming public offering.
The company is seeking a valuation of $1.4 trillion. The initial price range for shares is set between $70 and $78. At the midpoint of $74, the sale proceeds for each founder would total approximately $250 million.
At the lower end of the range, $70 per share, the payout drops to just over $236 million. At the upper limit of $78, the amount rises to just under $264 million. Historical data suggests companies often trade above these initial figures once demand is confirmed.
Internal signals point to strong interest. Board member Reed Hastings has stated he intends to purchase $300 million worth of stock via his donor-advised fund. Board member Christopher Liddell plans to buy $3 million worth of shares.
The founders
The seven individuals selling shares are CEO Dario Amodei; Daniela Amodei, president and chair of the board; Tom Brown, chief compute officer; Jack Clark, head of public benefit; Jared Kaplan, chief science officer; Sam McCandlish, chief architect; and Christopher Olah, interpretability research lead.
Following the transaction, each founder will retain roughly 3.2% of the total outstanding Class A shares. Collectively, they will hold about 22% of that specific class. This figure does not represent their ownership of the entire company. Amazon and Google hold non-voting Class N shares, meaning the founders’ stake in total equity is considerably smaller. Despite this, the group retains control. Each founder receives one share of Class F stock, which carries supervoting rights. Together, they command 51.1% of the votes, though no single individual holds a significantly larger portion than the others.
The seven departed OpenAI in 2021 following disputes with leadership regarding AI development priorities. Siblings Dario and Daniela Amodei, who previously held senior research and policy roles at OpenAI, joined five former colleagues to build a firm that has consistently prioritised AI safety over its competitors, including their former employer.
