This Week in IPOs: Anthropic's S-1 Replaces the Guesswork
Anthropic's public S-1 disclosed $16.3B in first-half revenue and an $80.7B non-cash loss, while the rest of the IPO calendar waits for it to clear.
For three months, every number attached to Anthropic's IPO was a rumor with a source attached to it: a valuation range reported by people familiar with the matter, a revenue run-rate cited from internal documents nobody outside the company had seen directly. That was the state of the story back in early September — a filing that existed, a timeline that kept sliding, and figures that moved every few weeks as new leaks arrived. On October 26, that changed. Anthropic made its Form S-1 public, and for the first time the numbers came from the company's own disclosure rather than someone else's description of it.
The filing itself
Anthropic filed to list Class A common stock on the Nasdaq Global Select Market under the ticker ANT, with Goldman Sachs and Morgan Stanley leading a 22-bank underwriting syndicate — a large enough group that it signals how much distribution capacity underwriters expect a deal this size to need. The S-1 doesn't yet include a share count or price range; those arrive in a later amendment, closer to pricing. What it does include is six months of real financial results: $16.3 billion in revenue for the first half of 2026, up from $1.1 billion in the same period a year earlier. That's roughly fourteen times the prior year's figure, and it's the number underwriters have been building valuation talk around — reporting now puts the target at $1.5 trillion to $2 trillion, with the listing targeted as soon as November 16. On Zorro's IPO pipeline, Anthropic has carried a 92% probability rating since the filing went public, the highest of any company currently tracked there.
An $80.7 billion loss that isn't what it looks like
The same filing discloses an $80.7 billion net loss for the same six-month period, a figure large enough to read as alarming next to $16.3 billion in revenue. It isn't operating losses of that size. The bulk of that number comes from a non-cash accounting charge tied to revaluing the company's convertible notes — financial instruments that convert into equity under specified conditions, and whose value on the balance sheet has to be marked to reflect Anthropic's own soaring valuation as a private company. As that implied valuation climbed through 2026, the accounting value of notes that will eventually convert into stock climbed with it, and GAAP rules require booking that increase as an expense even though no cash changed hands and no part of the business got worse. It's a real line on a real financial statement, but it measures how much more valuable Anthropic's own shares became on paper, not how much cash the business burned running itself.
The growth underneath the headline number
The customer metrics in the S-1 are the part that didn't need an accounting explanation. As of September 30, Anthropic reported more than 11,900 customers generating at least $100,000 in trailing-twelve-month revenue, up from roughly 950 a year earlier — better than a twelvefold increase in its largest-spending customer base in a single year. Net revenue retention, a measure of how much more existing customers are spending compared to a year prior, came in near 900%, an unusually high figure that reflects both genuine usage growth and the still-early stage of enterprise AI adoption, where last year's modest contracts have become this year's much larger ones. Those are the figures that explain why the valuation conversation kept climbing every time new reporting surfaced over the summer, long before anyone outside the company could see the underlying filing.
Everyone else is waiting their turn
The rest of the US IPO calendar took the opposite approach to Anthropic's this week: it mostly didn't move. Renaissance Capital's weekly preview, titled bluntly "November's IPO market set for a quiet start," listed only one firm deal — Football Manager SPAC, a blank-check vehicle targeting roughly $100 million to acquire a mid-tier European football club, tentatively set to price under ticker FBLLU. Nothing else on the docket is confirmed. That's consistent with a pattern that's held since late summer: banks running several multibillion-dollar AI-infrastructure and data-center deals — SB Energy, Oura, Switch, Nscale, DayOne Data Centers, all still sitting in Zorro's pipeline without a priced date — have largely avoided launching into a market that's absorbing an AI-sector selloff and waiting to see how the largest filing of the year performs first.
That's not an accident of scheduling. A $1.5-2 trillion listing absorbs an outsized share of institutional order-book attention for weeks around its roadshow, and few bankers want to launch a competing deal into that window if they can wait a month instead. The practical effect is a calendar that looks unusually thin right up until Anthropic prices, likely to be followed by a cluster of deals that held back specifically to avoid competing with it.
What actually changes once it prices
A filed S-1 with real revenue figures is still not a priced deal — the share count and price range that make a valuation concrete haven't been set, and everything about timing remains subject to the same amendment process every other filing goes through before it reaches the market. What's different now is that the inputs are no longer secondhand. Once Anthropic's amendment adds a price range and it actually lists, Zorro's recent-IPO tracker will start applying the same day-one-return and peak-analytics model to it that it applies to every other new listing on the site — the point where a filing story with disclosed financials finally becomes a stock with a market price attached.