Patrick T. Fallon | AFP via Getty Images Given the big debut of SpaceX, it's not unrealistic to imagine a quick rise of 10% for shares over the course of a single trading day. Few companies have captured the imaginations of investors quite like Space Exploration Technologies Corp. (ticker: SPCX). After years of private-market hype, the June SpaceX IPO blasted off at $135 per share, raising $75 billion and setting the record for the largest U.S. initial public offering ever.