After Blockbuster I.P.O., SpaceX Shares Are Slumping On Tuesday, SpaceX briefly fell below $150 a share, which is where the stock first began trading when the company listed publicly just over a week ago. June 23, 2026, 12:11 p.m. ET After its soaring debut as a public company, SpaceX has been on a turbulent ride in recent days, as pent-up demand for the stock has waned, alongside broader questions about the exuberance underpinning the artificial intelligence industry.