Anthropic warns investors: unauthorized platforms selling its shares are void

Anthropic, the artificial intelligence company behind the Claude model family, has issued a formal warning to investors: several secondary market platforms claiming to offer access to its shares are not authorized to do so. The company updated its website this week to name eight firms — Open Doors Partners, Unicorns Exchange, Pachamama Capital, Lionheart Ventures, Hiive, Forge Global, Sydecar, and Upmarket — as entities that cannot legally facilitate trades of Anthropic stock.

What the warning means for investors

In a blog post, Anthropic stated that any sale or transfer of its stock, or any interest in its stock, offered by these firms is void and will not be recognized on the company’s books. The warning applies to both preferred and common stock, which are subject to transfer restrictions. Any transaction not approved by Anthropic’s board of directors is considered invalid.

The company specifically called out special purpose vehicles (SPVs) and retail investment firms that claim to sell its shares directly or through forward contracts. Anthropic clarified that it does not permit SPVs to acquire its stock, and any transfer of shares to an SPV is void under its transfer restrictions. Offers to invest in past or future financing rounds through an SPV are also prohibited.

Rising demand for AI company shares on secondary markets

The warning comes amid a surge in investor appetite for private AI companies. Anthropic, which is rumored to be raising fresh funding at a valuation of around $900 billion, has become one of the hardest stocks to source on secondary markets, according to brokers who spoke to Bitcoin World last month. A growing number of platforms have emerged offering exposure to AI companies through secondary market holdings, tokenized securities, and derivative instruments such as pre-IPO perpetual futures contracts.

Some crypto exchanges, including OKX, have launched investment products that track the value of private AI companies but do not offer actual equity ownership. These derivative products differ from SPVs, which pool investor money to purchase actual shares from existing holders — sometimes acquired when an investor is forced to liquidate, as happened during the FTX bankruptcy. In other cases, the equity claim may be entirely fraudulent.

Why this matters for the broader market

Anthropic’s move highlights a growing tension between private companies seeking to control their shareholder base and the secondary market ecosystem that has developed around high-growth startups. For investors, the warning serves as a reminder that purchasing shares through unauthorized channels carries significant risk — including the possibility that the shares are invalid or that the seller lacks legitimate ownership. For the platforms named, the reputational and legal exposure could be substantial.

The company’s stance is not unique. Many private tech firms impose strict transfer restrictions to maintain control over their cap tables and avoid regulatory complications. However, Anthropic’s decision to publicly name specific platforms is an unusually direct step, signaling that it intends to enforce its restrictions aggressively.

Conclusion

Anthropic’s warning underscores the importance of due diligence for investors seeking exposure to private AI companies. While secondary markets can offer liquidity and access, they also carry risks that may not be immediately apparent. The company’s clear statement that unauthorized transactions will not be recognized should give pause to anyone considering buying its shares through unapproved channels.

FAQs

Q1: Can I buy Anthropic shares through a secondary market platform?
Only if the platform is explicitly authorized by Anthropic. The company has named eight platforms that are not authorized, and any sale through them is void.

Q2: What is a special purpose vehicle (SPV) in this context?
An SPV is an entity created to pool investor money to purchase shares of a private company. Anthropic does not permit SPVs to acquire its stock, and any such transfer is invalid.

Q3: Are derivative products like pre-IPO perpetual futures safe?
These products do not offer actual equity ownership and carry their own risks. Anthropic’s warning specifically targets platforms using such instruments to claim exposure to its shares.