Anthropic PreStocks on the Solana blockchain have plummeted 45% in the past 24 hours, reducing their implied market value from approximately $1.4 trillion to $762 billion, a loss of about $638 billion, according to SolanaFloor. This sharp decline follows Anthropic's investor warning that any unauthorized private equity sales, transfers, or related arrangements, including those through tokenized securities, forward contracts, or SPVs, may be deemed invalid. The company stated it would not recognize such token stock rights in its shareholder register and explicitly prohibited SPVs from acquiring its stock. PreStocks typically offer economic exposure linked to private company valuations without conferring actual equity or shareholder rights in Anthropic.