Anthropic, the artificial intelligence company behind the Claude model family, has taken the unusual step of publicly warning investors that several secondary market platforms offering access to its shares are operating without authorization. The company updated its website this week to name eight firms it says are not permitted to support trades in its stock, and warned that any transactions conducted through them will be considered void.
Which platforms are named and why it matters
Anthropic explicitly identified Open Doors Partners, Unicorns Exchange, Pachamama Capital, Lionheart Ventures, Hiive, Forge Global, Sydecar, and Upmarket as unauthorized intermediaries. The company stated that any sale or transfer of its stock — or any interest in its stock — offered by these firms will not be recognized on its books and records. The move reflects growing tension between private AI companies and the expanding ecosystem of secondary trading platforms eager to offer retail and institutional investors a piece of high-growth pre-IPO names.
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Forge Global, one of the named platforms, pushed back against the claim. A representative told TechCrunch that the company believes it was included in error and that it is working with Anthropic to remove its name from the alert. Forge stated it does not enable transactions in any private company’s shares without explicit approval from the company itself.
Why secondary markets are booming for AI companies
The warning comes amid a surge in investor demand for exposure to private AI companies. Anthropic, which is reportedly in discussions to raise fresh funding at a valuation of approximately $900 billion, has become one of the most sought-after names in secondary markets. Some brokers told TechCrunch last month that Anthropic shares are among the hardest to source. This scarcity has driven a proliferation of investment products designed to offer indirect exposure, including tokenized securities, special purpose vehicles (SPVs), and even crypto-based derivative instruments like pre-IPO perpetual futures contracts offered by exchanges such as OKX.
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SPVs differ from derivative products in that they allow investors to buy shares of an entity that holds actual equity in Anthropic. That equity may come from an official investor, or from a forced liquidation — as happened during the bankruptcy of FTX, which held a significant stake in the company. However, Anthropic warns that some claims of equity ownership may be entirely fraudulent.
What Anthropic’s transfer restrictions mean for investors
Anthropic made clear that both its preferred and common stock are subject to transfer restrictions. Any share sale or transfer not approved by its board of directors is considered invalid. The company explicitly prohibits SPVs from acquiring its stock, stating that any transfer of shares to an SPV is void under its restrictions. Offers to invest in past or future financing rounds through an SPV are also prohibited. This effectively shuts down a common workaround used by secondary platforms to offer exposure to private companies without direct share transfers.
The company also warned that third-party platforms claiming to sell its shares directly or through forward contracts are unauthorized. The message is clear: if you buy Anthropic shares through an unapproved channel, you may end up with nothing more than a legal claim against an intermediary — not actual equity in the company.
Conclusion
Anthropic’s public warning is a rare and significant step for a private company. It signals that the company is actively policing its cap table and is willing to publicly disavow unauthorized trading activity. For investors, the message is unambiguous: verify the legitimacy of any platform offering shares in private AI companies, and understand that secondary market access does not guarantee recognition by the company itself. As the secondary market for AI stocks continues to grow, such warnings may become more common — but for now, Anthropic has drawn a clear line.
FAQs
Q1: Can I still buy Anthropic shares through a secondary platform?
Only if the platform has explicit authorization from Anthropic. The company has publicly named several platforms it considers unauthorized, and warns that any transactions through them will not be recognized.
Q2: What happens if I buy shares through an unauthorized platform?
Anthropic states that such transactions are void and will not be recorded on its books. You may not have any legal claim to the shares, and you could lose your investment.
Q3: Why is Anthropic issuing this warning now?
Investor demand for AI company shares has surged, leading to a proliferation of secondary market platforms and investment products. Anthropic is acting to protect its cap table and prevent unauthorized trading that could create legal and financial complications.
