Anthropic, the artificial intelligence company behind the Claude model family, has issued a public warning to investors regarding unauthorized secondary market platforms that claim to offer access to its shares. The company updated its website this week to name several firms it says are not permitted to allow any sale or transfer of Anthropic stock.
Which platforms are named and what does Anthropic say?
Anthropic explicitly identified Open Doors Partners, Unicorns Exchange, Pachamama Capital, Lionheart Ventures, Hiive, Forge Global, Sydecar, and Upmarket as companies that are not authorized to provide access to buy or sell its shares. In a blog post, the company stated: “Any sale or transfer of Anthropic stock, or any interest in Anthropic stock, offered by these firms is void and will not be recognized on our books and records.”
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Forge Global, one of the named platforms, disputed its inclusion. A spokesperson told TechCrunch: “We are working with Anthropic to remove Forge’s name from this alert. Forge does not enable transactions in any private company’s shares without the explicit approval of the company.”
Why is this happening now?
The warning comes amid surging demand for exposure to high-growth AI companies. Anthropic, which is reportedly in talks to raise fresh funding at a valuation of $900 billion, has become one of the most sought-after names in the secondary market. Some brokers told TechCrunch last month that Anthropic shares are among the “hardest” to source.
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A growing number of investment platforms have emerged offering exposure to private AI companies through secondary market sales, tokenized securities, special purpose vehicles (SPVs), or derivative products. Some crypto exchanges, such as OKX, have launched pre-IPO perpetual futures contracts that track the value of private companies without offering actual share ownership.
Understanding the risks of SPVs and forward contracts
Anthropic made clear that both its preferred and common stock are subject to transfer restrictions. Any sale or transfer not approved by its board of directors is considered invalid. The company specifically warned against SPVs: “We do not permit special purpose vehicles (SPVs) to acquire Anthropic stock and any transfer of shares to an SPV are void under our transfer restrictions. Offers to invest in Anthropic’s past or future financing rounds through an SPV are prohibited.”
SPVs allow investors to buy shares of an entity that holds a stake in a private company. That equity may come from an official investor or from a forced liquidation, as occurred during the bankruptcy of FTX. In some cases, the equity claim may be entirely fraudulent, according to industry observers.
What this means for investors
The warning serves as a reminder that private company shares are not freely tradable like public equities. Investors considering secondary market purchases should verify that the platform has authorization from the company itself. Transactions conducted through unauthorized channels risk being voided, leaving investors with no legal claim to the shares.
For Anthropic, the move reinforces its control over its cap table and ensures that any future funding rounds or liquidity events proceed according to its own terms. The company’s stance is consistent with many venture-backed private firms that seek to limit unwanted or unknown investors.
Conclusion
Anthropic’s public warning highlights the growing complexity and risk in secondary markets for private AI companies. As demand for shares in firms like Anthropic intensifies, investors must exercise due diligence and confirm that any platform offering access is properly authorized. Unauthorized transactions may be voided, and investors could face significant financial loss.
FAQs
Q1: Can I buy Anthropic shares on any secondary platform?
No. Anthropic has stated that only transactions approved by its board of directors are valid. It has named several platforms it considers unauthorized.
Q2: What is an SPV and why does Anthropic prohibit it?
A special purpose vehicle (SPV) is an entity created to hold shares in a company on behalf of multiple investors. Anthropic says any transfer of its shares to an SPV is void under its transfer restrictions.
Q3: What should I do if I already bought shares through an unauthorized platform?
You should consult legal counsel. Anthropic has stated that such transactions will not be recognized on its books, meaning you may have no valid ownership claim.

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