As investors scramble to get their hands on shares of AI companies of all stripes, Anthropic this week updated its website to warn investors that a slew of private and secondary investment platforms that offer access to shares in the AI company are not, in fact, allowed to do so. The company named Open Doors Partners, Unicorns Exchange, Pachamama Capital, Lionheart Ventures, Hiive (new offerings), Forge Global (new offerings), Sydecar and Upmarket as companies that are not authorized to provide access to buy or sell its shares. “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,” the company’s support page reads. Reached for comment, Forge Global claimed to have been included erroneously. “We are working with Anthropic to remove Forge’s name from this alert,” the platform told TechCrunch.…