Key PointsSpaceX only made around 4% of its total shares initially available to the public during its IPO.The first lock-up period, when insiders can sell some of their shares, hasn't arrived yet for SpaceX.History suggests there's a good chance SpaceX will underperform in the first few years after its IPO.10 stocks we like better than Space Exploration Technologies › No stock has been discussed as much over the past few weeks as Space Explorati…