Amazon has chosen to keep its 12% ownership cap on Anthropic for the IPO. Anthropic’s amended S-1, filed with the SEC on 10 November, says Amazon “has elected not to waive” the cap. So only $579.3 million of Amazon’s $6,203 million of convertible notes turns into stock at the listing, and 1,563,617,444 Class N shares stay inside rollover notes.
At the $74.00 midpoint of the $70.00 to $78.00 range, those waiting shares are worth $115.7 billion, by our arithmetic. The notes behind them carry about $5.6 billion of principal and pay no interest: 20.6 times as much stock as principal.
Business Pill · Concentration Explained
A short explainer on concentration. It teaches the general idea only and does not discuss Anthropic.
The key insight: Anthropic’s S-1/A of 10 November says Amazon has elected not to waive its 12% ownership cap. Only $579.3 million of its $6,203 million of notes converts at the IPO; 1,563,617,444 Class N shares stay in rollover notes, worth $115.7 billion at the $74.00 midpoint against about $5.6 billion of principal, 20.6 times, by our arithmetic.
The cap sits in the notes themselves. The filing says “no portion of a note converts to the extent that, immediately following the conversion, Amazon would hold more than 12% of our capitalization”. That capitalization counts all outstanding stock on an as-converted basis, plus shares underlying equity awards and other convertible securities.
The new sentence is the decision: “Amazon may waive this limitation in its sole discretion but has elected not to do so in connection with this offering”. For the IPO conversion, the cap is measured against the “Note Capitalization”, Anthropic’s capitalization as of 31 October 2026, adjusted for the offering, the placement and other listing-day steps.
The result: $579.3 million of principal converts into 276,827,518 Class N shares just before the IPO, “representing the maximum number of shares issuable to Amazon Web Services, Inc. upon the completion of this offering without causing it to exceed the applicable ownership cap”. That works out to about $2.09 a share, the fixed price of Amazon’s 2023 notes, by our arithmetic.
The rest waits. The filing says “An aggregate of an additional 1,563,617,444 shares of Class N common stock will be issuable after this offering upon conversion of remaining outstanding convertible promissory notes, all of which are held by Amazon”. That is the 1,840,444,962 shares the notes convert into without the cap, less the 276,827,518 that convert now, by our arithmetic.
The 1,563,617,444 Class N shares that stay in Amazon’s rollover notes after Anthropic’s IPO, valued at the low end, midpoint and high end of the $70 to $78 range, against the principal left in the notes. Share count and range from Anthropic’s S-1/A of 10 November 2026; values and principal are our arithmetic.
What Changed Since 2 November
The 2 November S-1/A described the same cap as one “which may be waived at Amazon’s election”. It left blank how much would convert, how many shares Amazon would hold and how many would stay in the notes.
The 10 November filing fills all three. It says Amazon will hold 1,920,511,218 Class N shares immediately after the offering and the placement. It adds that the notes would equal about 25.5% of Class N stock and 12.6% of all outstanding common stock, “assuming full conversion without giving effect to the holder’s ownership cap”.
How the Rollover Notes Convert
After the IPO, the rollover notes convert at the end of each fiscal quarter, but only as far as the cap allows. The price is “the lowest of such fixed price, the IPO Price, and the 10-day trailing volume-weighted average price of our Class A common stock”. The fixed prices are $2.0928 for the 2023 notes and $5.0478 for the 2024 notes, far below the range, so the share count does not move with the IPO price unless the stock falls below them.
The 2023 notes mature in March 2034 and the 2024 notes in January, May and November 2035. If a balance has not converted by then, the filing says “such balance will be repaid in cash at such maturity date”. The notes may also be settled, at Amazon’s election, by set-off against amounts Amazon owes Anthropic under commercial agreements.
The same cap governs Amazon’s 2026 note purchase agreement, which has $15.0 billion available for issuance, the filing’s table shows. After the IPO, each draw is settled in Class N shares at the 30-day trailing volume-weighted average price when a compute capacity milestone is reached, “subject to the ownership cap”. A capped portion becomes another non-interest-bearing rollover note maturing in 10 years.
What the Cap Means in Shares
Amazon’s 1,920,511,218 Class N shares are 15.7% of the 12.24 billion Class A and Class N shares outstanding after the offering and placement, by our arithmetic. The 12% test uses a wider base that includes options, RSUs and convertibles. If all 1,563,617,444 rollover shares were issued and nothing else changed, Amazon’s slice of the outstanding shares would be 25.2%, by our arithmetic.
On a simple reading of the test, Amazon’s shares at 12% imply a base of about 16.0 billion shares. For all of the rollover shares to convert inside the cap, others would need to receive about 11.5 billion new shares, absent a waiver, by our arithmetic. The filing does not give a conversion schedule.
Amazon’s Side of the Ledger
Amazon’s third-quarter 10-Q says it invested $8.0 billion in Anthropic convertible notes from Q3 2023 to Q4 2025. It carried them at a fair value of about $146.2 billion on 30 September, with $140.3 billion of unrealized gain. It says that “Without giving effect to the ownership cap” the notes would convert into about 184 million preferred shares, each worth ten common shares.
That is about 1.84 billion common shares, in line with the 1,840,444,962 in Anthropic’s filing. Amazon’s 30 September value works out to about $79.44 per as-converted share, above the top of the $70.00 to $78.00 range, by our arithmetic. These are Level 3 estimates, not sale prices; our piece on the 10-Q covers Amazon’s $238.7 billion total carrying value.
Amazon’s 10-Q also says any notes that are not converted “would continue to be convertible to nonvoting common stock, subject to our ownership cap”. At $74.00, Amazon’s 1,920,511,218 Class N shares are worth $142.1 billion, and $257.8 billion with the rollover shares, by our arithmetic. Class N stock carries no vote.
What the Risk Factors Say
The risk factor on dilution from the notes now carries the waiver decision and the 25.5% and 12.6% figures, which were blank on 2 November. The risk factor on repaying the notes now says they convert “up to an ownership cap as set forth in the Amazon Notes, which Amazon has elected not to waive in connection with this offering”. The filing still lists 92 risk-factor headings, our count.
The Structural Read
As we read the filing, the cap changes when Amazon receives its shares, not how many it is owed: the share count is fixed by the notes’ $2.0928 and $5.0478 prices, and the cap meters it out quarter by quarter.
As we read the two filings together, the 2 November text left the waiver open and the 10 November text closes it for this offering; the filing says the cap may still be waived at Amazon’s election later.
Anthropic S-1/A, 10 November 2026
“Amazon may waive this limitation in its sole discretion but has elected not to do so in connection with this offering”
Three Implications
FOR IPO BUYERS The filing says the remaining notes equal about 25.5% of Class N stock and 12.6% of all outstanding common stock, assuming full conversion without the cap.
FOR AMAZON Its 1,920,511,218 Class N shares are worth $142.1 billion at $74.00, and $257.8 billion with the rollover shares, by our arithmetic; Class N stock carries no vote.
FOR ANTHROPIC Any balance that has not converted by maturity in 2034 and 2035 is repaid in cash, or by set-off against amounts Amazon owes Anthropic, the filing says.
The framework argues: “the capex race is no longer a corporate spending cycle. It is a sovereign-scale financing problem dressed in tech-company clothing”.
As we read it, Amazon’s notes are one piece of that financing: $8.0 billion lent from 2023 to 2025, per Amazon’s 10-Q, now owed back as 1.84 billion shares, with the 12% cap deciding how fast they arrive. The framework predates this filing and does not discuss it.
What Is Not Established
The final numbers depend on the final offering size; the filing says the shares issued at the IPO and the principal left as rollover notes “will be determined based on the final offering size and the application of the ownership cap to the Note Capitalization”. The filing gives no reason for Amazon’s decision and no forecast of quarterly conversions. Our values use the price range, not a trading price.
The Great Convergence of Capital, Power, and Geopolitics
This week’s issue: for two years the AI build-out was priced as a supply story, and last week as a credit story. This week it was priced as a permission story, and the answer arrived as a cost, not a ban.
Amazon has chosen to keep the 12% cap in place at Anthropic’s IPO. That leaves 1,563,617,444 Class N shares, $115.7 billion at the midpoint by our arithmetic, inside about $5.6 billion of non-interest-bearing rollover notes that convert quarter by quarter only as far as the cap allows.
A note on sourcing. Share counts, note terms and quotations are from Anthropic’s S-1/A filed with the SEC on 10 November 2026; earlier wording is from its S-1/A of 2 November 2026; Amazon’s figures are from its 10-Q filed on 30 October 2026. Values, multiples, sums and percentages are our arithmetic. Anthropic and Amazon were not contacted for this piece.
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.
