The OpenAI and Anthropic shares you bought off-market might be invalidated. Anthropic and OpenAI, two leading AI large model companies, suddenly updated their stock transfer policies yesterday. They announced that if you purchased company shares through unauthorized channels, your equity might be invalidated. At the same time, Anthropic released a blacklist that includes Forge and Hiive, two off-market equity platforms. Anthropic's updated page states that any stock sale or transfer not approved by the board is invalid. It's not disputable or reversible—it’s directly deemed invalid by the company. OpenAI's statement on the same day used similar wording, stating that any transfer without written consent is invalid and will not be recognized by OpenAI. Currently, both Anthropic and OpenAI have issued statements, but no new legal cases against off-market trading platforms have emerged yet.