Amazon has emerged as the largest financial beneficiary of Anthropic's upcoming IPO, with its convertible notes valued at $97.9 billion as of June 30. The company invested about $18 billion in total, including notes and preferred stock, while Anthropic carries a $965 billion private valuation. Venture firms such as Menlo Ventures, Sequoia, Sound Ventures and Spark Capital will also earn billions, yet none holds 5% of the company. The structure matters for business because cloud providers funded a model developer and now profit from both equity and compute contracts.
How Amazon and Google built their Anthropic stakes
Amazon first committed up to $4 billion to Anthropic in 2023 and later added billions more, largely through convertible notes rather than upfront equity. According to the S-1, Amazon holds notes with $6.2 billion in principal outstanding as of June 30, which represents Anthropic's entire debt load. Amazon's own filings put the fair value of those notes at $97.9 billion on the same date. It also bought $10 billion of nonvoting preferred stock in the second quarter, investing $5 billion in each of the last two funding rounds. Combined with $8 billion invested in notes from 2023 through 2025, total Amazon investment reaches about $18 billion.
Convertible notes are debt that converts into shares upon an IPO or sale, and their conversion value rose as Anthropic's valuation increased across funding rounds. The S-1 says Amazon's notes could convert into as many as 1.84 billion shares. Conversion is limited by a cap at 12% of Anthropic's partially diluted share count, a measure that includes some unissued shares such as stock options. Amazon can waive that cap, while notes that do not convert will remain outstanding and convert in later quarters under the same limit. Because the notes gained value, Anthropic recorded a non-cash charge of $72.4 billion for the first half of 2026 under change in fair value of convertible notes, derivative liabilities and SAFEs.
Venture investors face an unusual ownership picture because Anthropic's scale shrinks even large dollar positions into small percentages. None of the venture firms meets the 5% threshold for the principal stockholders table, which is atypical for a technology IPO where lead investors often hold double-digit stakes. At a $965 billion valuation, a 1% stake is worth nearly $10 billion, so Menlo's roughly $14 billion position equals only about 1.5%, according to Bloomberg figures cited in the report. Strategic partners therefore hold larger economic exposure than traditional venture backers. Google held about 14% as of early last year according to court filings reported by The New York Times, and PitchBook analyst Harrison Rolfes estimates the current stake at closer to 5.6% after dilution and additional investment including $10 billion in April.
What the IPO structure means for enterprise AI buyers
For companies that buy AI models and cloud capacity, the filing shows how closely model access is tied to infrastructure contracts. Anthropic committed to spend at least $110 billion on AWS over the next 10 years, while Google secured at least $114 billion in cloud commitments from Anthropic through 2033. That means two suppliers of computing power are also major shareholders in a leading model developer. Small firms will likely access Anthropic through AWS or Google Cloud marketplaces and partner programs rather than direct agreements. Large enterprises can expect bundled negotiations where model pricing, capacity reservations and cloud discounts move together.
The same structure creates dependencies that procurement teams should verify before committing to a platform. The S-1 warns that some cloud providers also build rival AI models and may not always share Anthropic's interests. A vendor supplying infrastructure, holding equity and developing competing models can face conflicts over pricing, capacity allocation and product priorities. Buyers should ask how capacity is guaranteed during demand peaks, whether model updates remain available across clouds, and how fees change if workloads move. The reported figures also do not by themselves establish future returns, since conversion terms, dilution and market pricing at listing will shape final outcomes.
The marker to watch is how Amazon uses the 12% conversion cap and the schedule for converting remaining notes in later quarters. A waiver, a large conversion tranche or a change in AWS spending pace would show whether equity gains are being turned into lasting infrastructure control. Google's final post-IPO percentage after recent funding rounds will provide a second check on cloud-provider influence. Together those disclosures will define how concentrated ownership of a major AI model remains among its compute suppliers.
