According to sources familiar with the matter, Anthropic is preparing an IPO plan that will allow existing shareholders to sell some of their shares during the IPO and is considering implementing a longer lock-up period than usual. Unlike the listings of other major tech companies this year, such as SpaceX and Cerebras, Anthropic has arranged for the transfer of existing shares during the IPO phase. However, some major tech IPOs in recent years, such as CoreWeave and Figma, have also included sales of existing shareholders' shares when issuing new shares.