SpaceX is expected to start trading on the Nasdaq in just over two weeks, but Morningstar analysts have warned that Elon Musk's tech behemoth is "significantly overvalued." The hotly-anticipated debut is expected to be the largest ever initial public offering, with SpaceX reportedly targeting a $75 billion fundraise and a valuation of $1.75 trillion. "We think the company has been significantly overvalued and investors will have opportunities to buy the stock at more attractive levels after the IPO," Morningstar analysts wrote in a note published Monday.