A $72.4bn Fair-Value Charge (Anthropic S-1, 26 October 2026): Why Anthropic's Paper Loss Is Amazon's Paper Gain — and What a Listed Price Changes for Amazon and Alphabet

Anthropic's IPO filing shows a net loss of $80.7 billion for the first half of 2026, and $72.4 billion of that is a fair-value charge on convertible notes and related instruments that rose in value as the company's valuation climbed. The other side of those instruments sits on Amazon's books: in the same quarter Amazon recorded a $50.5 billion upward revaluation, mainly on its Anthropic preferred stock. Once Anthropic trades on Nasdaq under the symbol ANT, those gains stop arriving in occasional jumps and start moving with a daily share price — two days before Amazon and Alphabet report.

What the S-1 discloses

The figures below come from Anthropic's Form S-1 as filed with the SEC on 26 October 2026. Market reaction and underwriters are from CNBC's coverage of the filing.

Two parts of the table carry the story. The revenue line is the operating business: most of it is billed on consumption, meaning customers pay for what they use through the API and cloud platforms, and CNBC reports the prospectus puts net revenue retention at about 900% as of 30 September. The loss line is mostly something else.

Why the loss is mostly a valuation effect

A convertible note is a loan that the lender can turn into shares on pre-agreed terms. If the company becomes more valuable, those terms become more valuable to the lender — and the issuer has to carry the note at that higher value, recording the increase as an expense. The faster the valuation rises, the larger the charge.

That is what the S-1 says happened. The $72.4 billion first-half charge was "primarily driven by an increase in the fair value of our outstanding convertible promissory notes resulting from an increase in our enterprise valuation", and the filing says it was largest in the second quarter, reflecting the Series H round. Subtract it from the $80.7 billion and what remains — about $8.3 billion — still includes other items, but the scale of the headline number is a by-product of success in fundraising, not of the operating business spending $80 billion.

The notes have one holder. The S-1 says the notes outstanding at 30 June consist entirely of non-interest-bearing rollover notes issued to Amazon, about $6.2 billion of principal. They exist because of an ownership cap: no portion of a note converts if Amazon would then hold more than 12% of Anthropic's capitalisation, unless Amazon chooses to waive the limit. The part that could not convert was rolled over as a new note.

Where the mirror image lands: Amazon

Amazon's Q2 2026 10-Q shows the other side. Between Q3 2023 and Q4 2025 Amazon invested $8.0 billion in Anthropic convertible notes; parts of them were converted to nonvoting preferred stock in Q1 2025 and Q1 2026, and in Q2 2026 Amazon invested a further $5.0 billion in Series G nonvoting preferred.

The preferred stock is recorded at its estimated fair value when acquired and adjusted afterwards only when there is an observable price — such as a new funding round. The 10-Q puts the Q2 2026 adjustment at $50.5 billion and the first-half figure at $62.8 billion, and says they "reflect observable changes in prices, primarily from our nonvoting preferred stock in Anthropic". Amazon's total other income for the quarter was $53.4 billion, against $1.1 billion in Q2 2025.

The commercial link runs separately. The 10-Q says that in Q2 2026 AWS and Anthropic expanded their existing multi-year commitment by more than $100 billion over ten years. The S-1's financing table adds a $15 billion Amazon facility that becomes available in $5 billion steps as compute-capacity milestones are met, with each draw settled in non-voting Class N shares priced at the 30-day volume-weighted average of the Class A stock. In other words, after the listing Amazon can fund compute capacity and receive equity whose value depends on the public share price.

Alphabet: the same channel, less disclosure

Alphabet's Q2 2026 earnings release reported other income of $98.0 billion, "primarily the result of net unrealized gains on our equity securities", and said the $99.0 billion gain on equity securities added $6.26 to diluted EPS of $9.11. Alphabet does not say which holdings produced it, so attributing the figure to Anthropic would go beyond the disclosure.

What the S-1 does confirm is the exposure. Google holds registrable Anthropic shares under a registration-rights agreement. It has a financing agreement, signed in March 2026, under which up to $20 billion could be provided through December 2030. And it has an option to buy Class N shares in a private placement alongside the IPO at the offering price; if it takes it up, the facility shrinks by up to $10 billion. Anthropic lists Google as a competitor in the same filing. It is also a cloud supplier and a shareholder.

What a listed price changes

Before the IPO, Anthropic's value to Amazon and Alphabet changes only when someone pays a new price for its shares. Funding rounds happen a few times a year, so gains arrive in large, irregular steps — and in a quarter without a round, nothing moves.

A listing replaces that with a daily price. Under US accounting, an equity holding with a readily determinable fair value is generally measured at that value through net income each period. The shape of the gain changes as a result: it no longer arrives in steps after a funding round but moves every quarter with the ANT share price, in either direction. A quarter in which the stock falls would put a loss in other income in the same way a rise puts in a gain. How each company accounts for its specific classes of stock — including non-voting Class N shares that convert to Class A only when sold to an unaffiliated third party — will be set out in their own filings, and is one of the details worth watching in the Q3 releases.

For the reader of a headline EPS number, the consequence is straightforward. A larger share of Amazon's and Alphabet's reported earnings will be tied to a stock that neither company controls. Operating income, segment margins and free cash flow — where Alphabet's Q2 figure was negative $5.9 billion, as capex of $44.9 billion exceeded $39.1 billion of operating cash — become the cleaner read of the underlying business.

Where it reaches the indices

The S-1 arrived as the market was already debating whether AI spending pays for itself, which this site traced through Meta's negative free cash flow and Microsoft's capex and leases. Bloomberg described Monday's gains in US stocks as a revival of the AI trade on the filing. There are three channels to the US500 and NAS100, and none of them implies a direction:

• Earnings mechanics. Amazon and Alphabet are large index weights. Revaluation gains raise their reported EPS without changing their cash generation, which matters for anyone comparing index earnings over time.
• Supply of AI equity. A large listing adds a new way to hold the AI theme. CNBC notes that SpaceX's IPO raised $85.7 billion in June; money allocated to new listings has to come from somewhere, and existing AI holdings are one source.
• A new price signal. A daily price for a frontier-model company gives the market a quoted measure of the business that the hyperscalers' capex is partly built to serve. That will feed into how the rest of the sector is valued, in either direction.

What would change the picture: the price range in the amended S-1; whether Google exercises its private-placement option; and how Amazon and Alphabet describe their Anthropic holdings in this week's Q3 reports.

What it means — and doesn't — for the dollar

This is not a currency story. The channel to the eight majors, if any, runs through risk appetite: a large swing in US tech shows up in the risk-sentiment factor the meter already scores and in the funding currencies that move with it, and portfolio inflows into a US listing are one small input among many for the US dollar. For how this site approaches stories outside currencies, see about; for the earlier IPO of the cycle, see SpaceX's first earnings as a listed company.

The useful conclusion is narrow. Anthropic's headline loss and Amazon's headline gain are the same accounting event recorded on opposite sides of the same contracts. The listing does not create that link; it puts a daily price on it.

Educational macro context only — not investment advice.