SpaceX Shares Jump in Second Day of Trading After Record IPO

SpaceXshares jumped in their second day of trading, adding to gains following a blockbuster debut that instantly vaulted it into the ranks of the world’s most valuable public companies.

The stock climbed as much as 8.7%, extending Friday’s 19% rally. The move boosts the company’s market value to more than $2.2 trillion, putting it among the top six largest companies in the world. At its current market capitalization, it’s roughly $400 billion away from overtaking Amazon.com Inc., which boasts a nearly $2.7 trillion value.

SpaceX has exercised the IPO’s over-allotment option, which lets underwriters sell an additional 83.3 ...