Anthropic has filed its S-1, and the paperwork confirms a trajectory no venture-backed company has matched: just over three years from its first major institutional round to a public listing positioned to break IPO records.

Spark Capital led that first round in spring 2023 — three and a half years ago — and now holds more than 1% of the company. At the valuations implied by the expected IPO, that stake could be worth tens of billions of dollars in short order. The comparison that frames the moment is SpaceX, which set the record for the largest IPO ever months ago; its first venture investors wrote checks in 2002.

What does the filing change for the skeptics?

Bessemer Venture Partners put $800 million into Anthropic since 2024, the largest bet in the firm's history, netting it an almost 1% stake. At the time of that first investment, the entry price — an $18 billion valuation for a startup that was not the market leader — struck many in the industry as steep. Critics dismissed the round as a "FOMO bet," arguing backers were simply compensating for having missed OpenAI.

Byron Deeter, a partner at Bessemer, acknowledged the perception at the time but said he held conviction that Anthropic could take the lead or come close, believing that "even if they didn't fully get there, they were going to be a hell of a challenger." He put the outcome more bluntly in the filing's aftermath: "There's no company that's gone from zero to where they are today in this period of time."

The numbers have quieted some financial critics — though notably, not all. Michael Burry's critique of the filing circulated alongside the disclosure of founder share counts. What the S-1 does not resolve is the political exposure: AI-related disputes remain live at the ballot box next week, with the tech industry pushing for more compute (raw processing capacity for training models) while populists oppose data-center expansion.

Anthropic also beat its chief rival to the exit. OpenAI, the ChatGPT maker, expects to go public next year, ceding the first-mover optics of the AI listing race to a company long framed as the challenger.

What does the wider money movement tell us?

The S-1 landed in a week dense with deal-making across the startup ecosystem:

• AI coding startup Cognition has received fresh funding offers valuing it between $70 billion and $80 billion, according to reporting from Katie Roof.
• Intel acquired Israeli quantum-computing startup Classiq for $2.3 billion.
• Software firm Guidewire signed a definitive agreement to acquire UK-based insurance-pricing startup Hyperexponential for $1.7 billion.
• Ferring agreed to acquire fertility startup Gameto in a deal worth up to $1.4 billion.
• Canada's Wealthsimple raised financing at a CAD $13.8 billion valuation.
• The US Department of Justice is asking whether Nvidia's deal to buy Hugging Face for nearly $13 billion would hurt AI competition.
• Andreessen Horowitz expanded its crypto fund to cover other emerging technologies and rebranded it as a16z Frontier.

The Nvidia inquiry deserves attention the headline numbers will not get. A regulatory challenge to a $13 billion consolidation would test how far antitrust authorities are willing to constrain the compute and model distribution layer of the AI market.

What does this change for New York's venture scene?

Geography, too, is being stress-tested by the AI boom. One New York-based VC at a large firm said they now spend nearly all their time in San Francisco because it is the epicenter of the boom. Jesse Middleton, a general partner at Flybridge, offered the counterargument: "New York is where founders turn them into products for the rest of the world (not just developers)." He pointed to a booming app layer — Clay, Hebbia, Rogo, ElevenLabs — and noted that every industry that actually buys this technology sits within a few subway stops of his office.

The rent data captures the tension. Median asking rent for a one-bedroom is about $4,580 per month in New York versus roughly $4,400 in San Francisco, a gap of only $180, according to Zumper. Whether San Francisco overtakes New York next year is, on this evidence, an open question — much like the durability of the valuations the Anthropic filing has now put on public record.