SpaceX shares have slipped back toward their $150 opening price only two weeks after the company’s record public-market debut, cutting deeply into one of the most watched IPO rallies of the year. SPCX closed at $153.23 on Friday after trading as low as $148.57 during the session. The stock opened at $150 on its first trading day and quickly rallied after the IPO, but the latest move puts it only slightly above the level where open-market trading began.