The Globe and Mail reports in its Thursday edition that SpaceX's slide below its initial public offering price risks turning a marquee stock-market debut into a confidence test, potentially rattling retail investors ahead of other mega-IPOs. A Reuters dispatch to The Globe says that Elon Musk's company, spanning rockets to artificial intelligence, debuted on June 12 and soared in the ensuing days, at one point valuing the company over $2-trillion (all figures U.S.). Since its debut, trading has been rocky. The stock slipped below its $150 opening price in late June with concerns about lofty tech stock valuations weighing on global indexes. The stock slid below its $135 IPO price for the first time Wednesday, closing at $135.27. SpaceX shares started trading as part of the Nasdaq 100 index about a week ago. A break below the IPO price is a psychological blow for SpaceX shares, said Miller Tabak's Matthew Maley. "It raises the narrative that the stock is up on fluff, on speculation, on froth, and not on fundamentals," he said. Weakness in SpaceX would put it more in line with 30 years of heavily hyped IPOs, where average and median returns over the first month are often negative. Facebook fell similarly after its debut.