Anthropic’s net loss of $23.3 billion for the three months ended 30 September 2026 included a $21.9 billion charge for the change in fair value of its convertible notes, derivative liabilities and SAFEs, according to the amended Form S-1 the company filed with the SEC on Monday, 2 November. That charge is 94% of the quarter’s net loss, by our arithmetic.
The same quarterly table shows an operating loss of $567 million. The rest of the gap between the operating line and the net line is other income and expense, interest income and tax.
The key insight: Anthropic’s amended S-1 shows a $567 million third-quarter operating loss and a $23.3 billion net loss; the $21.9 billion fair-value charge on its convertible notes, derivative liabilities and SAFEs is 94% of the net loss, by our arithmetic.
The filing’s quarterly statement of operations lists, for the third quarter of 2026, an operating loss of $567 million, interest income of $1,248 million, a $21,936 million charge for the change in fair value of convertible notes, derivative liabilities and SAFEs, other expense of $1,640 million and a $396 million provision for income taxes. Those lines produce the net loss of $23,291 million.
The quarterly table puts the second-quarter 2026 net loss at $66,309 million, so the third-quarter loss was smaller than the quarter before. It was larger than the $12,138 million net loss of the third quarter of 2025. The fair-value charge followed the same pattern: $59,597 million in the second quarter, $21,936 million in the third.
The filing describes the charge this way: “Because these instruments are marked to market, increases in our enterprise valuation drive increases in this expense”. It adds: “We will continue to recognize changes in the fair value of our convertible notes until they are converted into equity, repaid, or otherwise settled”.
Anthropic’s quarterly operating income (loss) and change in fair value of convertible notes, derivative liabilities and SAFEs, first quarter of 2025 to third quarter of 2026, in millions of dollars (unaudited). Source: Anthropic PBC, Form S-1/A filed with the SEC on 2 November 2026.
Business Pill · FORM AND SUBSTANCE
A short Business Engineer explainer on form and substance. It teaches the general idea only and says nothing about Anthropic or its filing.
Nine Months and Since 2023
For the nine months to 30 September 2026, the filing shows a net loss of $104.0 billion, which included $94.3 billion of fair-value changes. The filing says these changes “were primarily driven by an increase in the fair value of our outstanding convertible promissory notes resulting from an increase in our enterprise valuation during each of the respective periods”.
The filing also gives the running total. It says Anthropic’s “accumulated deficit of $156.2 billion” includes “$135.1 billion related to changes in the fair value of our convertible notes driven by increases in our enterprise valuation and derivative liabilities since 2023”. That is 86% of the accumulated deficit, by our arithmetic.
By quarter, the charge was $12,791 million in the first quarter of 2026, $59,597 million in the second and $21,936 million in the third, according to the quarterly table.
What the Filing Says Happens at the IPO
The offering section lists “the conversion of $ in aggregate principal amount of our outstanding convertible promissory notes into shares of Class N common stock immediately prior to the completion of this offering, representing shares issuable to Amazon Web Services, Inc. upon the completion of this offering without causing it to exceed the applicable ownership cap”. The principal amount is left blank in this preliminary filing.
As we read the filing, the net-loss line mostly tracks Anthropic’s valuation rather than its operations: the filing says increases in its enterprise valuation drive the fair-value expense, and that line was larger than the operating result in each of the last seven quarters in the table.
As we read the timing, the charge peaked at $59.6 billion in the second quarter and fell to $21.9 billion in the third, which is why the third-quarter net loss was smaller than the second quarter’s while still larger than a year earlier.
Anthropic’s amended Form S-1
“Because these instruments are marked to market, increases in our enterprise valuation drive increases in this expense”
Three Implications
FOR IPO INVESTORS The filing says the company will keep recognising fair-value changes on its convertible notes until they are converted into equity, repaid or otherwise settled.
FOR CREDIT ANALYSTS The filing’s operating loss for the quarter was $567 million, against a net loss of $23.3 billion, so the two lines give very different readings of the same quarter.
FOR NOTEHOLDERS The offering section lists a conversion of convertible notes into Class N common stock immediately before the IPO for shares issuable to Amazon Web Services, with the principal amount left blank.
The quarterly figures are unaudited, as the filing states. The filing leaves blank the principal amount of notes to be converted at the offering, so the size of the conversion is not yet known. The 94% and 86% shares are our arithmetic from the filing’s figures.
This Week In The AI Supercycle
Anthropic’s Reality Check, The Capital Squeeze, & The New World Order
This week’s issue: for two years the AI build-out was priced as a growthstory. This week it started being priced as a credit story.
Anthropic’s amended S-1 shows that $21.9 billion of its $23.3 billion third-quarter net loss came from the change in fair value of its convertible notes, derivative liabilities and SAFEs, which the filing ties to increases in its enterprise valuation. Such changes add up to $135.1 billion of its $156.2 billion accumulated deficit since 2023, the filing says.
A note on sourcing. All figures and quotations are from Anthropic’s amended Form S-1 filed with the SEC on 2 November 2026; quarterly figures are unaudited. The 94% share of the quarter’s net loss and the 86% share of the accumulated deficit are our arithmetic.
Gennaro Cuofano is a CRO and tech executive who has worked in AI since late 2015, starting with bringing NLP, natural-language generation, voice and chatbot products to the marketing industry. His background is in law and finance: he holds a Master's degree in Law and an International MBA with an emphasis on corporate finance (LUISS Business School and the University of San Diego, 2012), and worked as a financial analyst at a real-estate investment firm in San Diego and as an assistant controller. His work focuses on business model strategy, business engineering and, more broadly, structural analysis: how companies make money, read from their own filings. He created FourWeekMBA and leads research there and at The Business Engineer, his newsletter on AI and business strategy, with over 95,000 subscribers and more than 1,000 published analyses. His writing has also appeared on Entrepreneur (for example, How to Digitize a Family Business in Europe) and HackerNoon. Find him on LinkedIn and Substack. See how we source.
