Ronaldo Schemidt/Getty Images When SpaceX starts trading on the Nasdaq on Friday, investors will be watching whether the largest IPO ever can stay above its offering price on a slim float, unusually large retail buy-in and a rolling lockup. On Thursday, SpaceX said it sold 555.6 million shares at $135 per share, raising $75 billion in the largest IPO on record. Underwriters have a 30-day option to purchase an additional 83 million shares. The outcome of SpaceX’s IPO, investors say, will have bro

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