Amazon and Google's combined stakes in Anthropic could be worth about $411 billion if the AI company prices its IPO at the top of its proposed range, according to Reuters calculations based on the company's filing. The figures use $78 a share.

Amazon's position comes to roughly $271.8 billion against $18.0 billion invested through loans in 2023-25 and share purchases in April and May 2026. Google's stake is valued at about $139 billion against $33.3 billion invested, including a $10.0 billion private placement in the IPO itself.

The IPO also includes $26.0 billion of private placements for 2.55% of the company at $78 a share, with Nvidia matching Google's $10.0 billion. The $411 billion is stake value at the IPO price, not profit, and neither company has commented. Both also sell Anthropic computing power, tying the stakes to commercial dependence.