"Anthropic’s backers are hopeful that its IPO will be propelled by so-called forced buyers, including index funds and large asset managers, which do not currently own any of the stock but will in effect be obliged to do so shortly after the company is public."

https://www.ft.com/content/314e17df-e7af-4814-b208-70a0557cb452?syn-25a6b1a6=1