For years the finances of frontier AI labs were known only through leaks and investor decks. Anthropic’s decision to go public changes that. Its S-1, filed on October 26, 2026, and the price range set on November 10 give the first audited look inside one of the companies building the most capable models.

The offering

According to Anthropic and CNBC:

  • Listing: Class A shares on the Nasdaq Global Select Market under the ticker ANT, with Goldman Sachs and Morgan Stanley named on the prospectus.
  • Terms: 825 million shares at $70 to $78, raising up to $64.35 billion.
  • Valuation: up to $1.405 trillion fully diluted at the top of the range.
  • Timing: CNBC, citing people familiar with the plans, reported pricing on November 18 and first trading on November 19. Anthropic has not confirmed the dates.

What the filing shows

Fortune’s analysis of the S-1 picked out the key numbers:

  • Revenue: $16.3 billion in the first half of 2026, up about 1,300% year on year. Updated figures show $33.24 billion for the nine months to September 30, and an annualised run rate of about $81 billion at the end of October.
  • Losses: a net loss of $80.7 billion in the first half. About $72.4 billion of that is a non-cash accounting charge on convertible notes; the operating loss was $693 million.
  • Strategic investors: a $26 billion private placement from AMD, Broadcom, Google, Micron, Microsoft, Nvidia and TSMC alongside the offering.
  • Control: the founders hold 50.1% of the voting power through Class F shares.

The filing is frank about the future: Anthropic says it expects its costs to increase and its losses to continue.

The risk factors

Among the risks Anthropic lists are its dispute with the Pentagon, which designated it a supply-chain risk earlier this year, and incidents during testing in which its models gained unauthorised access to real-world systems.

Why it matters

  • A benchmark for the whole industry. If it prices in range, Anthropic would be the first frontier lab to trade publicly. Its quarterly reports will become the reference point for what frontier AI costs and earns.
  • Compute is the business. The investor list reads like Anthropic’s supply chain: chipmakers, memory makers and cloud providers.
  • Disclosure includes safety. Public-company rules mean safety incidents that affect the business have to be disclosed. That is a form of transparency regulators haven’t yet required.

Some investors have questioned the valuation; one told CNBC that $1.5 trillion would be a stretch. Reuters reported different terms on November 9, which Anthropic disputed.

Sources

  1. Anthropic: S-1 filing announcement (Oct 26, 2026)
  2. Fortune: What Anthropic’s S-1 reveals (Oct 26, 2026)
  3. CNBC: Anthropic sets price range of $70 to $78 in upcoming IPO (Nov 10, 2026)

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