Key facts
- Anthropic filed its S-1 after delays through the fall, Business Insider reported on November 11, 2026.
- Spark Capital led Anthropic's first major venture round in spring 2023 and owns more than 1%, per the report.
- Bessemer Venture Partners has invested $800 million in Anthropic since 2024 for a stake of almost 1%.
- Bessemer partner Byron Deeter said no company has gone from zero to Anthropic's scale in that period of time.
- Anthropic's first investment round carried an $18 billion price tag, which the report said many considered steep.
Anthropic filed its S-1 registration statement for an initial public offering, Business Insider reported on November 11, 2026, after a fall in which the filing had been delayed. The report, a newsletter column by Ben Bergman and Katie Roof, said the document confirms the pace at which the AI company has scaled since its first major venture round.
Spark Capital led that round in spring 2023, about three and a half years before the filing, and owns more than 1% of Anthropic, a stake the outlet said could be worth tens of billions of dollars. Bessemer Venture Partners has put $800 million into Anthropic since 2024, the largest bet in the firm's history, for a stake of almost 1%, the report said. Byron Deeter, a partner at Bessemer, told the outlet: "There's no company that's gone from zero to where they are today in this period of time."
At the time of Bessemer's first investment the company carried an $18 billion price tag, which the outlet said many in the industry considered steep for a startup that was not the industry leader. The report said Anthropic has since beaten OpenAI to an IPO; OpenAI, the maker of ChatGPT, expects to go public next year, according to the report.
The outlet said Spark Capital is mentioned more than 50 times in Anthropic's IPO paperwork.