Anthropic Warns Against Unauthorized Stock Sales on Secondary Platforms

May 13, 2026
Anthropic has issued a warning to investors about unauthorized firms and platforms offering access to its shares, emphasizing that any transactions not approved by its board are void.
Anthropic Warns Against Unauthorized Stock Sales on Secondary Platforms
Image: Generative AI

Anthropic has warned investors about unauthorized firms offering access to its shares, according to a notice on its support website. The company stated that both its preferred and common stock are subject to transfer restrictions, and any sale or transfer not approved by its board of directors will be considered invalid.

Anthropic listed several firms that are not authorized to buy or sell its shares. These include Open Door Partners, Unicorns Exchange, Pachamama, Lionheart Ventures, Hiive (new offerings), Forge (new offerings), Sydecar, and Upmarket. The company clarified that any transactions involving these entities will not be recognized in its records.

The company also said that special purpose vehicles (SPVs) are not permitted to acquire its stock, and any offers to invest through SPVs or retail investment funds claiming indirect access to Anthropic shares are prohibited. It further cautioned that individuals contacted by parties offering investment opportunities in Anthropic should assume such offers are invalid.

Anthropic advised potential investors to verify the legitimacy of any offering through official regulatory databases and to seek independent legal or financial counsel before proceeding with any investment claiming to involve its equity.

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