A bid by individual investors to grab a sliver of SpaceX before it goes public has propelled a niche ETF into the spotlight, highlighting retail euphoria over Elon Musk’s business empire and the scramble for access to equity in private companies. The ERShares Private-Public Crossover ETF (ticker XOVR) has taken in more than $470 million since Dec. 8 — more than half its total assets — as investors seek to get in on what could become the biggest initial public offering ever. Most Read from Bloomberg The ...