PANews reported on May 13th that, according to AXIOS, Anthropic is cracking down on unauthorized secondary market stock trading, at least verbally. Anthropic previously stated that any sale or transfer of Anthropic stock or any Anthropic equity interest without board approval is invalid and will not be recognized in the company's books and records. It subsequently named eight secondary trading platforms, including well-known platforms such as Hiive and Forge. The report states that Anthropic's restrictions are not uncommon; the complexity lies in the fact that while Anthropic does not allow special purpose vehicles (SPVs) to purchase its stock, many SPVs claim they can. Typically, SPVs can provide indirect investment opportunities through derivatives, and some SPVs themselves are derivatives, entering into agreements with authorized holders, making it virtually impossible for issuers to regulate them. The report points out that despite Anthropic's strong warnings to potential buyers and sellers, it is unlikely to take many enforcement actions.