SpaceX shares rallied sharply on Friday, overcoming two major hurdles that many investors expected would send the stock tumbling. Instead, the newly public aerospace and satellite company ended the week with renewed momentum. The selloff reflected broader market concerns about whether companies investing aggressively in artificial intelligence can generate sufficient returns to justify soaring infrastructure costs. The newly unlocked shares represented roughly 43% more stock than the 638.9 million shares originally offered in the IPO, more than doubling SpaceX's public float. SpaceX shares gained 6.1% on Thursday, surprising many analysts who had anticipated heavy selling pressure.