Anthropic warns investors: Several secondary market platforms are unauthorized to sell its shares

Anthropic updated its official website this week, warning investors that several private and secondary market investment platforms are not authorized to provide channels for buying and selling its shares. The platforms named include Open Doors Partners, Unicorns Exchange, Pachamama Capital, Lionheart Ventures, Hiive (newly launched), Forge Global (newly launched), Sydecar, and Upmarket. Anthropic stated that any share sales or transfers offered by these companies are invalid and will not be recognized in the company's books.

The company emphasized that both its preferred and common shares are subject to transfer restrictions, and any transactions without board approval are invalid, explicitly prohibiting the acquisition of its shares through special purpose vehicles (SPVs). Forge Global responded that it was mistakenly listed and is communicating with Anthropic to have it removed; Sydecar stated that it only performs administrative functions and does not buy or sell securities. This move comes as Anthropic is rumored to be seeking a new round of financing at a valuation of $900 billion, with several secondary market brokers calling it one of the hardest shares to obtain.