Amazon poised to reap $100 billion-plus from Anthropic IPO, dwarfing VC payouts

Anthropic’s upcoming public offering will deliver sizable returns to its backers, but the distribution of upside is far from typical. Venture capital firms such as Menlo Ventures, Sequoia Capital, Sound Ventures and Spark Capital each hold positions worth billions, yet none cross the 5 percent threshold required for inclusion on the principal stockholders list. At a private valuation of $965 billion, a 1 percent stake is roughly $10 billion; Menlo’s estimated $14 billion holding therefore represents only about 1.5 percent of the company, according to Bloomberg data cited in the filing.

The outlier in the capital structure is Amazon, which entered the deal in 2023 with a commitment of up to $4 billion. Rather than taking equity outright, Amazon structured most of its investment as convertible notes, a form of debt that automatically converts to stock at the IPO or a sale. The S-1 shows that, as of June 30, Amazon’s notes total $6.2 billion in principal, comprising Anthropic’s entire debt load. Because Anthropic’s valuation has surged through successive funding rounds, the fair-value of those notes has ballooned to $97.9 billion on Amazon’s books. The company recorded a non-cash charge of $72.4 billion on its income statement for the first half of 2026 to reflect the rising liability.

If fully converted, the notes could yield as many as 1.84 billion Anthropic shares, but a contractual cap limits Amazon to 12 percent of the “partially diluted” share count. The cap can be waived, and any portion that cannot convert now will remain outstanding for later conversion periods under the same limitation.

Amazon’s exposure extends beyond debt. In the second quarter, the retailer invested an additional $10 billion in non-voting preferred stock, splitting the amount evenly across Anthropic’s two most recent financing rounds. Adding the $8 billion Amazon has already placed in convertible notes from 2023 through 2025, the total Amazon commitment approaches $18 billion.

The financial upside is amplified by a long-term cloud services agreement. Anthropic has pledged to spend at least $110 billion on Amazon Web Services over the next decade, guaranteeing a steady revenue stream that will continue regardless of the IPO outcome. Google, another major cloud partner, holds an estimated 5.6 percent stake after earlier reports of a 14 percent holding and has secured $114 billion in cloud commitments through 2033.

For founders and operators, Anthropic’s capital structure illustrates how strategic corporate investors can leverage convertible instruments to secure both equity upside and deepened commercial ties. Venture firms still anticipate multi-billion payouts, but the S-1 makes clear that the most lucrative beneficiaries will likely be the tech giants that paired early capital with long-term service contracts.

Looking ahead, the market will watch how Amazon exercises its conversion rights and whether the cap is lifted. The outcome will shape expectations for future AI startups that consider hybrid financing models, balancing venture backing with corporate partnerships that can ultimately dominate the financial upside.