Anthropic S-1: did it really lose $80.7 billion?

On Monday, October 26, Anthropic filed its Form S-1 with the SEC for its initial public offering. EDGAR shows the filing accepted at 9:00 a.m. ET, and the company announced it on its blog the same day.

The number making the rounds on X is the loss: $80.7 billion in six months. The quick read is that Anthropic is burning cash at an impossible pace. The prospectus tells a different story, and it is worth reading with the table open.

I downloaded the full document from EDGAR and searched the text for every number below. Next to each figure I name the S-1 section where it appears, so you can check it yourself. Anything that is my own math or my own reading is labeled as such.

Revenue: from $41 million to $16.3 billion in one half-year

The "Consolidated Statements of Operations Data" table, inside "Summary Consolidated Financial and Other Data", shows this revenue (in millions of dollars):

• 2023: 41
• 2024: 386
• 2025: 4,585
• First half of 2025: 1,163
• First half of 2026: 16,286

In "Risk Factors", the item that starts with "We are at an early stage of our revenue growth" turns that into growth rates: 841% year over year in 2024, 1,088% in 2025 and 1,300% in the first half of 2026. In the same paragraph the company says it does not expect revenue to keep growing at comparable rates and expects its growth rate to decline over time.

"Management's Discussion and Analysis of Financial Condition and Results of Operations" (MD&A), under "Comparison of the Six Months Ended June 30, 2025 and 2026", adds detail: first-half revenue rose $15.1 billion, with $12.1 billion from consumption-based revenue and $3.0 billion from subscriptions.

There is customer data too. Per the "Prospectus Summary" ("Enterprise Adoption of Claude") and the MD&A ("Adoption of Claude"), as of September 30, 2026 Anthropic had more than 11,900 customers paying $100,000 or more on a trailing twelve-month basis, up from more than 950 a year earlier. More than 1,900 are above $1 million and about 250 are above $10 million. The "Prospectus Summary" ("Strengths of Our Financial Model") reports Net Revenue Retention of approximately 900% as of that date.

The $80.7 billion loss, taken apart

This is the part the quick read skips. In the same "Summary Consolidated Financial and Other Data" table, the first half of 2026 looks like this (in millions of dollars):

• Operating loss: 693
• Interest income: 1,111
• Change in fair value of convertible notes, derivative liabilities, and SAFEs: a loss of 72,388
• Other income (expense), net: a loss of 8,757
• Net loss: 80,748

Footnote 2 of that table explains the $72.4 billion line: the changes were primarily driven by an increase in the fair value of outstanding convertible notes, resulting from an increase in the company's valuation. Put simply, Anthropic owes shares to investors who lent it money through convertible notes, and the more the company is worth, the more that debt "costs" on paper. It is an accounting charge, not cash that left the bank in the half-year.

The $8.8 billion line has a similar explanation. The MD&A, under "Other Income (Expense), Net" for the half-year, attributes it primarily to the initial fair value recognition and change in fair value of assets and liabilities tied to note purchase agreements.

My math with those figures: the $72.4 billion fair value charge is about 90% of the half-year net loss. The loss from the business itself, the operating loss, was $693 million.

The quarterly view is even more striking. In "Quarterly Results of Operations" (MD&A), the quarter ended June 30, 2026 shows operating income of $974 million, alongside a net loss of $66.3 billion in the same quarter. It is the only one of the six quarters in the table with positive operating income.

Cash moved too. In "Liquidity and Capital Resources" (under "Cash Flows"), operating activities provided $3.9 billion in the first half of 2026, compared with $1.5 billion used in the same half of 2025.

The annual trend points the same way. The operating loss was $551 million in 2023, $3.0 billion in 2024 and $8.1 billion in 2025, while the fair value line went from $1.0 billion to $5.4 billion and then $34.3 billion ("Summary Consolidated Financial and Other Data"). The 2025 net loss was $42.0 billion.

The S-1 also publishes non-GAAP measures. Under "Non-GAAP Financial Measures" in the summary, Adjusted Operating Income for the first half of 2026 is a positive $1.6 billion. The company defines these numbers itself, so I treat them with more caution than the GAAP table.

Compute: the spending that is operational

The "Compute and infrastructure" line is the largest operating expense. In "Summary Consolidated Financial and Other Data" (in millions of dollars): 433 in 2023, 2,522 in 2024, 7,326 in 2025, 2,334 in the first half of 2025 and 8,945 in the first half of 2026.

The MD&A, under "Compute and Infrastructure" in the half-year comparison, says this expense grew 283% and fell from 201% of revenue to 55%. It attributes the increase to the delivery of committed compute from its cloud providers during the first half.

The efficiency line the company leads with is in the "Prospectus Summary" ("Strengths of Our Financial Model") and the MD&A ("Compute Efficiency"): revenue for the quarter ended June 2026 grew 1,368% year over year, while compute and infrastructure expenses grew 300%. I checked it against "Quarterly Results of Operations": revenue of $787 million versus $11.6 billion, and compute of $1.4 billion versus $5.6 billion. The numbers add up.

The same summary says Claude Opus 5.5 reduced customer costs per task by approximately 40% compared to Claude Opus 5. That is a company claim, without detail on how it was measured.

What you cannot read yet is the size of future compute commitments. In "Risk Factors" and in the MD&A ("Compute Investments" and "Contractual Obligations"), the total is blank: "aggregate committed spend of more than $ ", with no number. The contractual obligations table is empty, including its as-of date.

Who is in charge: the PBC, the Long-Term Benefit Trust and the Class F share

The cover page, "Our Governance Structure and Its Goals" and the "Management" section lay out the control structure:

• Anthropic is a Delaware public benefit corporation (PBC). Its stated purpose is "the responsible development and maintenance of advanced AI for the long-term benefit of humanity", and the board must balance it against stockholders' financial interests and the interests of those affected by its conduct.
• The Long-Term Benefit Trust (LTBT), set up in 2023, has five financially disinterested trustees. Through Class T stock it elects and removes the Class T directors. Today the board has six members and the LTBT elected three of them, so it does not yet hold a majority. After the IPO the board will have seven seats and the LTBT will elect four, which is a majority ("Management", under "Board of Directors").
• One of those four seats comes with a condition. To nominate, remove without cause or change the "Specified Class T Director", the LTBT needs the concurrence of the board's nominating and corporate governance committee. If the committee does not concur within 15 days, the matter goes to a vote of the Class E stockholders, which are employees other than the co-founders ("Our Governance Structure and Its Goals", under "Election and Removal of Directors").
• Class T stock has no economic rights and no vote on other matters.
• Right before the offering, an entity owned by the seven co-founders will receive a single Class F share carrying 50.1% of the votes on matters put to stockholders, including the election of the non-Class T directors. It has no economic rights either.
• The stock offered to the public is Class A, with one vote per share. Anthropic has applied to list on the Nasdaq Global Select Market under the symbol "ANT", and Goldman Sachs and Morgan Stanley appear on the cover.

My reading: buyers of Class A shares will not decide who runs the company. After the IPO, that is split between the LTBT, with a majority of the board, and the co-founders, with 50.1% of the votes. The S-1 itself says Anthropic will be a "controlled company" under Nasdaq governance rules.

One more detail, in "Our Commitment to Public Benefit": the company contributed 846,840,960 Class N shares, 5% of its fully diluted shares as of June 30, 2026, to a wholly owned fund dedicated to that purpose.

What the S-1 leaves blank

This is a preliminary prospectus and it has gaps. I confirmed these in the text:

• The price range per share (cover: "between $ and $").
• The number of shares sold by the company and by selling stockholders (cover).
• Revenue for the quarter ended September 2026 ("Prospectus Summary" and "Risk Factors").
• Run-Rate Revenue as of October 31, 2026 ("Business", under "Significant Revenue Growth").
• Total compute commitments and the "Contractual Obligations" table.
• The pro forma balance sheet columns and pro forma net loss per share ("Summary Consolidated Financial and Other Data").

What is proven and what is interpretation

Proven in the S-1: the revenue, operating loss, fair value charge, net loss and compute figures cited above, along with the PBC structure, the LTBT's seats (3 of 6 today, 4 of 7 after the IPO), the Class F share and the blank fields.

Company claims inside the S-1: the 40% cost-per-task reduction with Opus 5.5 and the roughly 900% net revenue retention. The non-GAAP measures belong in the same group. They sit in a document filed with the SEC, but Anthropic defines and calculates them.

My interpretation: that the $80.7 billion loss says little about the operating business, and that after the IPO control stays with the LTBT and the co-founders. Both follow from the S-1, but the conclusion is mine.

What I would watch in the next S-1 amendment

1. The price range and share count, once an amendment fills them in.
2. Third-quarter 2026 revenue, to see whether the curve holds or flattens.
3. The total compute commitments and their payment schedule.
4. Whether the quarter with operating income repeats or was a one-off.
5. The pro forma adjustment that removes the fair value charge tied to the convertible notes conversion. The S-1 already has the line, with no amount.

Bottom line

The $80.7 billion figure is real and it is in the S-1, but about 90% of it is an accounting adjustment driven by a higher valuation. The more useful signal in the document is elsewhere: a business that went from $41 million in revenue in 2023 to $16.3 billion in a single half-year, with compute shrinking as a share of that revenue. The price and the compute commitments, which are what you would need to judge the offering, are still blank.

Disclaimer: this article summarizes a public document. It is not investment advice or a recommendation to buy or sell any security.

Frequently asked questions

How much revenue does Anthropic report in its S-1?

$16.3 billion in the first half of 2026 and $4.6 billion for all of 2025, per "Summary Consolidated Financial and Other Data".

Why did Anthropic lose $80.7 billion in six months?

Mainly because of a $72.4 billion charge for the change in fair value of convertible notes, derivative liabilities and SAFEs, which the S-1 attributes to its higher valuation. The half-year operating loss was $693 million.

How much does Anthropic spend on compute?

$8.9 billion in the first half of 2026, or 55% of revenue for the period. Total future compute commitments are blank in this S-1.

What is the price of Anthropic's IPO?

Not known yet. The price range and the number of shares are blank in the preliminary prospectus.

What is the Long-Term Benefit Trust?

A five-member trust with no financial interest in the company that, through Class T stock, elects and removes Anthropic directors: 3 of 6 today, and 4 of 7 after the IPO, which is a majority. For one of those four seats it needs the agreement of the board's nominating committee or, failing that, the approval of employees holding Class E stock.

What ticker would Anthropic trade under?

Anthropic has applied to list its Class A stock on the Nasdaq Global Select Market under the symbol "ANT".

Sources

• Anthropic, PBC: preliminary prospectus (Form S-1) on EDGAR
• EDGAR filing index, accepted October 26, 2026
• Anthropic: official announcement of the S-1 filing