TL;DR
Anthropic has issued a public warning to investors that several secondary platforms claiming to sell its shares are not authorized. The company emphasizes that any transactions through these platforms are invalid, aiming to prevent scams and unauthorized sales. The development highlights ongoing concerns over secondary market risks for private AI company shares.
Anthropic has publicly warned investors that several private and secondary investment platforms claiming to offer access to its shares are not authorized to do so. The company stated that any sale or transfer of its stock through these platforms is void and will not be recognized on its books, aiming to curb unauthorized transactions and potential scams. This warning underscores ongoing concerns over unregulated secondary markets in private AI company shares.
In a recent update on its website, Anthropic identified platforms including Open Doors Partners, Unicorns Exchange, Pachamama Capital, Lionheart Ventures, Hiive, Forge Global, Sydecar, and Upmarket as unauthorized to facilitate the buying or selling of its shares. The company explicitly stated that any transactions through these firms are considered void under its transfer restrictions. Forge Global responded to the notice, claiming its inclusion was erroneous and affirmed that it does not facilitate transactions without explicit approval from Anthropic. Meanwhile, Unicorns Exchange clarified that it only provides introduction services and has received over 50 inquiries from institutional investors seeking to buy Anthropic shares in the past three months, with demand exceeding $1 trillion. Despite these high levels of interest, no deals have been completed, as buyers could not verify official approval from Anthropic. Other platforms like Sydecar confirmed they only act in an administrative capacity, requiring sponsors to attest to proper documentation and approvals. The warning comes amid a rise in secondary market offerings for private AI shares, with Anthropic reportedly valued at around $900 billion in private funding rounds, making its shares highly sought after. The company emphasized that any offers to purchase shares through SPVs or other third-party platforms without its approval are invalid, citing transfer restrictions on both preferred and common stock.
Why It Matters
This development is significant because it highlights the increasing risks for investors seeking exposure to private AI companies through secondary markets. Unauthorized platforms may be involved in scams, fraudulent transactions, or illegal share transfers, potentially leading to financial losses. The warning also reflects Anthropic’s efforts to maintain control over its share distribution and prevent unregulated trading that could affect its valuation and corporate governance. For investors, it underscores the importance of verifying official channels when seeking to buy or sell private company shares, especially in a rapidly growing and competitive AI sector.

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Background
Over the past year, secondary markets for private AI company shares have expanded, driven by rising valuations and investor demand. Anthropic, with a rumored valuation of $900 billion, has become a particularly sought-after target for secondary trading. Several platforms have emerged offering access to these shares, often through tokenized securities, SPVs, or other financial instruments. However, many of these platforms operate without explicit authorization from the companies whose shares they claim to sell, raising concerns about legality and security. Anthropic’s recent warning is part of broader efforts by AI firms to assert control over their ownership structures amid increasing secondary market activity.
“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.”
— Anthropic support page
“We are working with Anthropic to remove Forge’s name from this alert. Forge does not facilitate transactions in any private company’s shares without the explicit approval of the company.”
— Forge Global spokesperson
“We have ceased marketing Anthropic-related opportunities to potential buyers. None of these deals have been completed because the buyers could not verify official approval from Anthropic.”
— Unicorns Exchange spokesperson Iris Harpaz
“Anthropic is right to take concerns around unauthorized share sales seriously. We invest heavily in legal, compliance, and diligence infrastructure, and all share transfers facilitated by Hiive are approved by the issuer.”
— Dakota Betts, Hiive spokesperson
authorized secondary market for private shares
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What Remains Unclear
It remains unclear how widespread the use of these unauthorized platforms is and whether any illicit transactions have successfully occurred. The full scope of ongoing or planned enforcement actions by Anthropic is also not yet known, and some platforms may continue to operate in gray areas or attempt to evade restrictions.

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What’s Next
Anthropic is likely to continue monitoring secondary market activities and may pursue legal action against platforms that violate its transfer restrictions. The company may also strengthen its communication and enforcement efforts to prevent unauthorized sales. Investors should await further clarifications from Anthropic and regulatory developments that could impact secondary market trading of private shares.
private equity share transfer services
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Key Questions
No, according to Anthropic, any sale or transfer of its shares through unauthorized platforms is void and not recognized by the company. Investors should use only official channels approved by Anthropic.
Why are some platforms claiming to sell Anthropic shares?
These platforms are likely attempting to capitalize on high investor demand and the rising secondary market for private AI shares. However, many of these claims are unauthorized and potentially illegal.
Investors risk losing their money, engaging in fraudulent schemes, or acquiring shares that are invalid or unenforceable, which could lead to legal complications and financial losses.
While specific actions are not publicly confirmed, Anthropic’s warning indicates an intent to enforce its transfer restrictions and prevent unauthorized sales, possibly including legal measures.
Investors should consult official communications from Anthropic and verify that the platform is recognized or approved by the company before engaging in any transactions.