Anthropic Warns Against Unauthorized Secondary Sales of Its Stock Anthropic, one of the most closely watched AI startups, is moving to clamp down on a booming gray market for its shares, warning investors that many deals they think are legitimate may never be recognized.

Early warnings and specific platforms named

On May 12, Anthropic publicly cautioned investors about secondary trading platforms that claim to offer access to its stock, stating that several firms are not authorized to provide such services. The company listed eight names: Open Doors Partners, Unicorns Exchange, Pachamama Capital, Lionheart Ventures, Hiive, Forge Global, Sydecar and Upmarket, and said investors should not rely on them to buy or sell Anthropic shares.

Soon after, more detail emerged on the scope of the clampdown. In a follow-up report, Anthropic was described as having “raised alarm over secondary share sales” and issued a strong warning that any sale or transfer of its stock not approved by its board would be void and not recognized on its books and records.

How platforms and market norms collide

The warning landed in a market where secondary trading in private tech companies is common. The Axios report noted that Anthropic’s restrictions “aren’t unusual,” as many startups require board approval and attach rights of first refusal to common stock transfers, especially at high valuations.

However, some of the named platforms, including Hiive and Forge, argued they only facilitate issuer‑approved transfers and, in Forge’s case, even asked Anthropic to remove its name from the list.

The SPV complication and enforcement questions

A major flashpoint is the role of Special Purpose Vehicles (SPVs) and derivative structures. Anthropic says it does not permit SPVs to buy its stock, even as multiple SPVs have claimed access and in some cases filed with the SEC. These vehicles can offer indirect exposure via complex derivatives that are difficult for issuers to police.

Analysts note Anthropic’s loud warning may not be matched by aggressive legal follow‑through, since widespread enforcement could create a “titanic legal headache” and even risk delaying a future IPO.

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