The company ticked off a few more boxes on the second Starship V3 flight, but appears to have had another issue relighting the booster's rocket engines.

The company didn't immediately say what went wrong. SpaceX's stock plunged more than 4% in after-hours trading before paring losses.

The stock has steadily fallen from the euphoric post-IPO high, showing that markets may be sobering up to the promises CEO Elon Musk made before and after SpaceX went public.