Elon Musk's SpaceX is preparing for what could become the largest public listing in history, with a target valuation exceeding $1.75 trillion. While investors may focus on the IPO itself, the bigger development could be how quickly the company finds its way into widely held index funds.

Elon Musk’s SpaceX is preparing for a $1.75 trillion IPO that could place the company in major index funds within days. Changes to long-standing index rules may bring the stock into retirement portfolios far sooner than many investors expect.