On October 26, 2026, Anthropic, PBC filed the public version of its Form S-1 with the Securities and Exchange Commission. The company proposes to list its Class A common stock on the Nasdaq Global Select Market under the ticker ANT. The registration is not yet effective — no shares have been priced, no range has been set, and no shares can be sold until the SEC completes its review.

The Loop called the deadline on October 14, two weeks before the IPO investor day. Under Section 6(e) of the Securities Act, the public S-1 for a road show starting the week of November 9 needed to be on EDGAR by about October 23. It landed October 26 — three days past the window the lawyers would have preferred. Nothing in the announcement explains the slip. Bloomberg's prediction, carried in TastyTrade's roundup, is that the roadshow still starts the week of November 9 and the debut lands before Thanksgiving.

The front matter of the filing names Goldman Sachs & Co. LLC and Morgan Stanley & Co. LLC first in a syndicate of 22 underwriters — the full set runs through J.P. Morgan, Citigroup, Barclays, Wells Fargo Securities, BofA Securities and sixteen others. When the entire bulge bracket shows up on your cover page, nobody wants to be the bank that said no.

The two loss numbers that are not the same number

Anthropic reported H1 2026 revenue of $16.286 billion. The same six months of 2025 produced $1.163 billion. That is 14x year-on-year growth over a half-year cadence, and it beats the entire 2025 revenue figure ($4.585 billion) by a factor of 3.5.

Operating loss for the same six months: $693 million. That is roughly 4.3% of revenue, and it is the number that describes the actual gap between what the business brought in and what it cost to run.

Net loss for the same six months: $80.7 billion. That is the number headlines will use.

The difference between $693 million and $80.7 billion — roughly $80 billion — is almost entirely non-cash. The filing attributes $72.4 billion to "changes in fair value of convertible notes, derivative liabilities, and SAFE instruments." When a private company raises at valuations that keep climbing — Series G at $380 billion in February, Series H at $965 billion in May — the convertible paper issued at earlier prices gets marked to the new valuation every quarter. That mark-to-market lives in the income statement under GAAP, and at a valuation this high relative to current revenue, it eats the P&L whole. It is a loss that is mostly a math problem. The money did not leave the building.

The filing also discloses historical annual net losses of $1.5 billion (2023), $8.3 billion (2024), and $42.0 billion (2025). The last of those — like 2026's — is dominated by fair-value swings on a stack of convertible instruments that nobody held when the 2023 number was being computed. A headline reader will add the four annual numbers and get $132 billion of losses on $21 billion of lifetime revenue. The accounting is correct. The intuition it generates is misleading.

That the gap between operating loss and net loss is now two orders of magnitude is the clearest reason this filing had to be public before the Series H paper rolls into another round. Private financing can absorb a decade of fair-value non-cash losses. Public filings do not read as kindly.

The voting structure built so the seven co-founders never lose control

The governance section of the S-1 is where this IPO becomes architecturally interesting. Anthropic is listing a single class of economic common stock — Class A, one vote per share — but it is listing it over the top of two other share classes nobody can buy.

• Founder LLC. A limited liability company whose initial members are the seven Anthropic co-founders. It holds a single Class F share. That Class F share carries 50.1% of the total voting power on matters submitted to stockholders generally. Not 50.1% of a diluted economic stake — 50.1% of the votes. On every ordinary stockholder vote, the seven founders can decide the outcome before Class A opens its ballots.
• Long-Term Benefit Trust. Holds Class T shares, which do not vote on general matters but elect and remove the Class T directors. The Class T directors form the majority of the board. Ben Bernanke sits on the LTBT. Christopher Stubbs joined on October 21 — the appointment Anthropic disclosed five days before the public S-1. Between them, the LTBT and the Founder LLC mean the board majority is picked by one body and the stockholder-vote majority is picked by another, and both are set up to outlast the public float.
• Class N. 846,840,960 shares — exactly 5% of fully diluted shares at June 30, 2026, assuming full conversion of the Amazon convertible notes — were contributed to the Anthropic Public Benefit Fund, LLC on October 18. That is the piece the Loop covered a week ago. The S-1 formalises the arrangement and adds a top-up clause: the board may issue additional Class N up to 2% of outstanding shares whenever the stock price rises 50% above the previous milestone, starting from the IPO price.

The combined effect is that Anthropic will be, by Nasdaq's own definition, a "controlled company" — a category that lets it skip several Nasdaq corporate-governance rules on independent-director majorities and nominating-committee composition. The rulebook explicitly carves this status out for companies with a controlling shareholder or group. Anthropic will take it.

The pitch to buyers is that the founders should keep steering through the transformative-AI period without being overthrown by a quarterly earnings miss, and that the LTBT keeps a safety-weighted body of trustees — not an activist hedge fund — picking the people with hiring authority over the CEO. The pitch to governance ratings agencies is less flattering. Both pitches are true at the same time.

What's not in the filing yet

• Share count and price range. Both are explicitly undetermined. They will land in an amended S-1 (an S-1/A) ahead of the roadshow. The CoinMarketCap recap of the June confidential draft referenced the $965 billion private valuation; market speculation in TastyTrade's summary runs up to $1.5–$2 trillion. None of those are an offer price. The amendment is where the two numbers finally meet.
• Lockup length. The filing leaves open whether existing holders — Series F, G, H and employees — can sell at open or sit through the standard 180-day lockup. A shorter window for a subset of pre-IPO investors is a Series H concession the filing does not yet confirm.
• Underwriting discount and over-allotment. Standard, but spelled out only once price is set.

What to watch

1. The S-1/A that sets the price range. If the band comes in above the Series H $965 billion post-money, the Series H investors mark up on day one. If it comes in below, there was private pressure to delay the roadshow. Either number tells you what Goldman and Morgan Stanley's equity desks heard from institutional buyers in the last two weeks.
2. Whether the Risk Factors describe MCP and Agent Skills as a moat. Anthropic donated the Model Context Protocol in December 2025 and Agent Skills on October 22 — four days before the public filing. If the S-1 files those donations under "competitive advantages," the moat is being pitched as credibility. If they land under "collaboration with the ecosystem," they are being pitched as goodwill. Both can be true at once; the lawyers chose one. The amended filing will show which.
3. The customer-concentration disclosure. The S-1 reports 11,900 customers with $100,000+ TTM revenue at September 30, 2026 — up from roughly 950 a year earlier, a 12.5x expansion of the paying tier. About 250 of those pay $10 million or more. The number worth watching is what share of H1 revenue the top ten account for. If any single customer accounts for more than 10% of revenue, the SEC requires naming them. Several Loop stories this year have revolved around enterprise deployments; the filing may name the dependency.
4. Second-half 2026 revenue. CoinMarketCap carried a $47 billion run-rate figure from May; TastyTrade's roundup cited Yahoo Finance pushing that past $65 billion by late July. H1 2026 revenue of $16.3 billion implies first- and second-quarter run-rates well below both numbers. If the amended S-1 shows a Q3 revenue update near $12 billion for the single quarter, the run-rate framing is justified. If Q3 lands at $9 billion, the run-rate claims were marketing.

For a company whose public roadmap this year has included a public-benefit fund, a protocol donation, a second investor day, an LTBT appointment and a full S-1 — all inside a two-week window — the filing on October 26 is the one that locks the structure in. Nothing in the governance section is designed to come apart later. The seven co-founders have built an exit that does not require them to leave.

Section 6(e) says the roadshow can begin fifteen days from the public filing. The clock is already running.