SpaceX is officially a public company. After making history as the largest IPO ever, SpaceX stock rocketed higher on its first day of public trading on Friday, closing over 19% up from its IPO price. Friday was a historic day for the stock, but the real test won't come until the lock-up period expires, which will be when early investors can cash out their stake. Investors should be mindful of the critical role the lock-up calendar will play in the liquidity and supply profile of SpaceX, Chan