The Globe and Mail reports in its Friday edition that Elon Musk's SpaceX altered the playbook for stock-market listing by behemoths, as major U.S. index providers such as Nasdaq rewrote the rules around inclusion, ensuring a massive pool of passive money would buy the shares in the first 15 days of its listing. A Reuters dispatch to The Globe says investors expect the same dynamic with Anthropic. The Claude chatbot creator aims to raise up to $64.4-billion by selling 825 million shares priced between $70 and $78 each, valuing the company at up to $1.4-trillion (all figures U.S.). In the past, major index providers generally did not add companies to their benchmarks until weeks or months following their debut. Like SpaceX, Anthropic will be added to at least six big indexes, including FTSE's USA Index, the S&P Total Market Index and the Nasdaq-100, within five to 15 days of its listing. "Anthropic is a mirror image of the SpaceX IPO. In that regard, it has the same index-related drivers over the first 15 days of trading," said Carsten Hesse at Berenberg in London. Rebalance analytics firm Intropic estimates passive demand from index-tracking funds will account for about 28 per cent of Anthropic's shares offered.