According to PANews, on May 13, Anthropic and OpenAI warned that unauthorized equity transfers—including transactions via SPVs, tokenized tools, or forward contracts—may be invalid and unrecognized by the companies. Anthropic PreStocks prices fell approximately 38%, while OpenAI PreStocks dropped around 46%. Both companies emphasized that their common and preferred shares are subject to strict transfer restrictions, and transactions lacking board approval will not receive shareholder rights recognition. OpenAI additionally cautioned that such trades could violate U.S. securities laws, potentially leaving buyers without actual economic rights.