Anthropic IPO to Boost Amazon and Alphabet Valuations

The confidential June S-1 filing of Anthropic has set up what could be the year's defining public offering, targeting a mid-October listing window. Goldman Sachs, Morgan Stanley, and JPMorgan are leading the offering, with Chief Financial Officer Krishna Rao holding early investor meetings. Private chatter suggests a valuation approaching $2 trillion, roughly double the $965 billion mark set during its Series H round in May.

Anthropic's IPO will benefit Amazon and Alphabet, which hold multi-billion-dollar equity stakes alongside long-term cloud infrastructure contracts with the startup. Amazon holds an estimated 15% to 21% equity stake in Anthropic, built through a structured capital layout that includes an early $8 billion tranche, $5 billion added in April 2026, and up to $20 billion tied to commercial milestones.

In return, Anthropic committed over $100 billion to Amazon Web Services and Trainium hardware over the next decade. The financial dividend is already landing on Amazon's balance sheet: Q2 2026 non-operating income contained roughly $53 billion in mark-to-market adjustments from Anthropic, pushing GAAP earnings per share far past consensus estimates.

Alphabet maintains a 14% to 15% position in Anthropic, a stake contractually capped to manage the competitive tension between Google's internal Gemini models and Anthropic's Claude. Despite this rivalry, Alphabet committed up to $40 billion in additional funding in April 2026, securing a massive commercial lock-in: Anthropic pledged roughly $200 billion toward Google Cloud, including access to up to 1 million Tensor Processing Units.