As the company prepares for its stock market debut, here’s what the initial public offering means for banks, Elon Musk and everyday investors.

Elon Musk’s rocket company, on the cusp of the largest initial public offering ever, will soon end up in index funds after rule changes by Nasdaq and other index providers.

Major indexes have mostly been treading water for months, as investors’ exuberance for artificial intelligence wears off.