Anthropic shares surging on secondary markets with $25M minimum buy-in

The most coveted asset in private markets right now is not a late-stage tech unicorn or a buzzy fintech. It is a piece of Anthropic, and getting it will cost you at least $25 million just to sit at the table.

Secondary market demand for Anthropic shares has reached levels that are genuinely difficult to describe without resorting to superlatives. According to pre-IPO market sources cited by Fortune, buyer demand is running at roughly five interested parties for every two investors seeking OpenAI shares on certain trading platforms.

A valuation trajectory that rewrites the record books

Anthropic closed a $65 billion Series H funding round in May 2026, setting a primary post-money valuation of $965 billion. By early July 2026, implied valuations on platforms like Caplight and Rainmaker Securities had climbed to $1.2 trillion, with some transactions reportedly suggesting a ceiling closer to $1.5 trillion. To put that in perspective, $1.5 trillion would place Anthropic above OpenAI’s secondary-market valuation of roughly $908 billion. The year-over-year move represents a roughly 550% increase.

The catch is that most retail investors cannot participate. Minimum investments in special purpose vehicles structured around Anthropic exposure have been reported in the $10 million to $25 million range, effectively making this a game for institutional players and the ultra-wealthy.

Supply scarcity is doing most of the heavy lifting

Few existing Anthropic shareholders are willing to sell. The company itself has been deliberately restrictive about share transfers, maintaining tight controls over who can trade and through which channels.

Anthropic has also gone out of its way to publicly identify unauthorized secondary trading platforms and flag SPV structures it does not recognize. The company’s position is clear: transactions outside accepted channels may not be acknowledged, which adds a meaningful layer of legal and operational risk for buyers chasing shares through informal routes.

IPO expectations are shaping the bidding war

Anthropic filed the necessary paperwork for a potential IPO in June 2026, and investors who missed the Series H or earlier rounds are now treating secondary markets as their last realistic entry point before a public listing reprices everything.

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