Anthropic IPO S-1: What the Filing Reveals About Revenue

The most anticipated listing of the year now has a paper trail. On October 26, 2026, Anthropic, PBC filed a registration statement on Form S-1 with the U.S. Securities and Exchange Commission for a proposed Anthropic IPO, and the document gives investors their first audited look at how fast the Claude maker is growing. Spoiler: the revenue line is something else.

• Listing plan: Class A shares on the Nasdaq Global Select Market under the ticker "ANT," with share count and price range not yet set.
• Revenue: $16.29 billion in the first half of 2026, up from $1.16 billion in the first half of 2025, and $4.59 billion for full-year 2025.
• Customers: more than 1,900 customers spending at least $1 million a year as of September 30, 2026, per IPOScoop's read of the filing.
• Underwriters: Goldman Sachs and Morgan Stanley lead a syndicate of more than 20 banks.

What Does the Anthropic S-1 Say About Revenue Growth?

Here's the line that jumps off the page. According to the S-1, Anthropic's revenue went from $41 million in 2023 to $386 million in 2024 and then $4.59 billion in 2025. The first six months of 2026 alone brought in $16.29 billion, roughly 14 times the same period a year earlier.

The filing also points to how customers expand once they start. Anthropic reports a net revenue retention of about 900% as of September 30, 2026, meaning existing customers, on average, spent around nine times more than a year before. It also notes that heavy Claude Code users on Claude Enterprise spent about 20 times as much as Enterprise users who didn't use Claude Code. If you want a refresher on reading these numbers, our guide to reading an earnings report walks through the basics.

Is Anthropic Profitable?

Not on a reported basis yet, but the operating trend is moving the right way. The S-1 shows an operating loss of $693 million in the first half of 2026, down from $2.14 billion a year earlier, even as revenue exploded. Compute and infrastructure remained the biggest expense at $8.9 billion for the half.

The headline net loss looks much larger, $80.7 billion for the first half, but most of that is an accounting item. The filing explains that $72.4 billion came from changes in the fair value of convertible notes and similar instruments, driven by the rise in Anthropic's own valuation. That is a non-cash charge tied to the company becoming more valuable, not money going out the door. Finimize, which analyzed the filing, highlighted a 10% adjusted operating margin for the first half and noted Anthropic held about $112 billion in cash plus $19 billion in short-term investments at the end of June.

How Will the Anthropic IPO Work?

The S-1 does not set a price range or share count yet. Those arrive in a later amended filing once the roadshow begins. IPOScoop reports that marketing could start as soon as the week of November 9, citing Bloomberg, and that some IPO watchers expect a raise in the neighborhood of $75 billion. Treat those as market estimates, not company guidance.

A few structural points are worth knowing before you place an order:

• Public benefit corporation: Anthropic is incorporated as a Delaware PBC, so its board weighs its stated mission alongside shareholder returns.
• Long-Term Benefit Trust: an independent trust generally has the power to elect and remove a majority of the board.
• Controlled company: Anthropic expects to qualify as a "controlled company" under Nasdaq rules, which changes some governance requirements.

What Should Retail Investors Watch Next?

The next milestones are the amended S-1 with a price range, the roadshow, and pricing night. Brokerages that offer IPO access will open indication-of-interest windows once terms are public, much like the process we covered for the OPay IPO filing. Read the risk-factor section, size any position sensibly, and remember that first-day pops and dips say little about long-term value. For more listings and market explainers, follow our stock trading coverage.

Sources: SEC EDGAR, Anthropic Form S-1 — October 26, 2026; Anthropic — October 26, 2026; IPOScoop — October 26, 2026; Finimize — October 26, 2026.