Key Highlights

  • Anthropic's S-1 names four non-cancellable compute counterparties: Broadcom (NASDAQ:AVGO) at about USD 161 billion, Alphabet at USD 115 billion, Amazon at USD 110 billion and Microsoft at USD 45 billion in published market data.
  • Alphabet (NASDAQ:GOOGL) holds about 14% of Anthropic with a 15% cap, Amazon holds about USD 6.2 billion of convertible notes, and Microsoft disclosed a USD 3.2 billion gain on its stake.
  • Cloud marketplaces generated 48% of Anthropic's first-half 2026 revenue, up from 11% in 2023, and platform fees were about USD 351 million in 2025, roughly 16 cents per channel dollar in published market data.
  • The S-1 admits the arrangement could give rise to conflicts of interest, because the cloud suppliers are also shareholders, distributors and rivals of Anthropic in published market data on the dates cited.

Amazon (NASDAQ:AMZN): Largest Named Contract at About USD 161 Billion

The S-1 shows Amazon (NASDAQ:AMZN) as an investor, a chip supplier and a distributor. Amazon holds convertible notes of about USD 6.2 billion that convert into about 1.84 billion non-voting shares. That is an average conversion price near USD 3.37 a share, simple arithmetic on two published numbers. Anthropic has about USD 110 billion of non-cancellable commitments for compute built on Amazon's Trainium chips. Customers can also buy Claude through AWS Bedrock, where the cloud provider bills the customer, keeps a fee and passes the rest on to Anthropic. Amazon's relationship therefore combines equity, chip supply and marketplace fees in one filing, which investors must analyse together rather than line by line. A convertible note is a loan that can turn into shares. Anthropic's first-half net loss of USD 80.7 billion included about USD 72.4 billion of non-cash charges, because convertible notes and SAFEs issued to early backers are revalued as the company's own valuation rises. The operating loss for the half was only USD 693 million. For Amazon, the same revaluation can produce gains on its holding when the valuation climbs, and losses if it falls. Amazon also competes with Anthropic through its Nova models, so the relationship runs in several directions at once. No price forecast is offered for Amazon (NASDAQ:AMZN).

Alphabet (NASDAQ:GOOGL): The Largest Stake at About 14%

The S-1 shows Alphabet (NASDAQ:GOOGL) in four roles at once. Alphabet is a shareholder with about 14% and a 15% cap, a supplier of about USD 115 billion of TPU compute, a distributor through Vertex AI on Google Cloud, and a competitor through its Gemini models. The filing admits the arrangement creates complex dynamics that could give rise to conflicts of interest and affect Anthropic's access to compute. Each role earns Alphabet money in a different way: equity gains, chip revenue and a share of marketplace fees, which the filing treats as the price of reach into large customers. Anthropic's co-founders still hold control through a Class F share, so Alphabet's stake carries no extra votes. Marketplace sales work in three steps. A Google Cloud customer buys Claude through its existing account, Google bills the customer and keeps a fee, and the rest passes to Anthropic. An analysis of the draft S-1 found Anthropic paid about USD 351 million to the platforms in 2025, roughly 16 cents of every channel dollar. The undrawn facility of up to USD 20 billion adds a lending link. Alphabet's net cash comparison needs care: its gross cash of USD 242 billion exceeds the post-IPO estimate for Anthropic, but its USD 98 billion of debt lowers its net position.

Microsoft (NASDAQ:MSFT): USD 6.2 Billion of Convertible Notes

The S-1 names Microsoft (NASDAQ:MSFT) as a shareholder, a compute supplier and a distributor. Microsoft disclosed a USD 3.2 billion gain on its stake, and Anthropic has about USD 45 billion of non-cancellable commitments tied to Azure. Customers can buy Claude through Azure AI Foundry, where the cloud provider bills the customer and keeps a fee. Microsoft also competes through Copilot and in-house models. The S-1 says such dynamics could give rise to conflicts of interest. On October 26, 2026 the shares closed at USD 532.60, up 1.54%, ahead of the broader market's 0.70% gain. The filing also shows how closely Anthropic is tied to its three cloud partners. A gain on a minority stake arises when the carrying value is raised after a new valuation. Anthropic's last private round in May valued it at USD 965 billion, and the IPO talk of USD 1.5 trillion to more than USD 2 trillion implies further upside for holders. The gain is therefore tied to a valuation rather than cash received, and it could reverse if the IPO is priced lower. Microsoft's compute links are the cash side of the relationship: USD 45 billion of commitments to its cloud are a multi-year revenue stream for Azure if Anthropic keeps spending. A gain also sits in earnings and may be excluded by analysts who focus on operating results.

Broadcom (NASDAQ:AVGO): A USD 3.2 Billion Gain on a Smaller Contract

Anthropic made its S-1 public at 9:00 a.m. ET on October 26, 2026. It lists named compute contracts of about USD 637 billion, of which about USD 430 billion cannot be cancelled: about USD 161 billion with Broadcom (NASDAQ:AVGO), USD 115 billion with Google, USD 110 billion with Amazon and USD 45 billion with Microsoft. Broadcom is therefore the largest single counterparty, about 37% of the non-cancellable total, simple arithmetic on two published numbers. Because these are commitments to buy, they act like a multi-year purchase order, which is why chip suppliers rallied on the day. Anthropic's first-half 2026 revenue was USD 16.3 billion, so the contracts are large relative to current sales. Anthropic does not pay for every chip up front. Apollo and Blackstone arranged about USD 35 billion of financing in which a special purpose vehicle buys chips and leases them to Anthropic, with the lease payments servicing the debt. The senior tranche prices near 5.75% and the junior near 8.5%. Broadcom (NASDAQ:AVGO) is reported to cover interest on the senior tranches if Anthropic falls short, which supports the pricing but gives the chipmaker a contingent exposure.

Where Things Stand

The answer is that Anthropic needs chips, cloud reach and capital, and these four companies supply them in different mixes, so each is a shareholder, supplier, distributor or competitor at once. Broadcom (NASDAQ:AVGO) has the largest named contract, Alphabet the largest stake, Amazon the convertible notes and Microsoft the smallest compute commitment. The evidence is positive for orders and mixed for conflicts and valuation, which has been discussed from USD 1.5 trillion to more than USD 2 trillion. Further disclosure from Amazon (NASDAQ:AMZN) would clarify the picture. Official notices from Amazon (NASDAQ:AMZN) remain the best guide. Later reporting on Microsoft (NASDAQ:MSFT) will add detail. Further disclosure from Microsoft (NASDAQ:MSFT) would clarify the picture. Official notices from Microsoft (NASDAQ:MSFT) remain the best guide.