SpaceX is preparing to go public next year and has opened a secondary share sale that would value the company at $800 billion, according to a letter to shareholders sent by the company's CFO Bret Johnsen and reviewed by Reuters.

The Elon Musk -led company's move towards a public listing, which could rank among the largest global initial public offerings, has been driven primarily by the rapid expansion of SpaceX's Starlink satellite internet business, including plans for a direct-to-mobile service and progress in its Starship rocket program for missions to the moon and Mars.

In the letter dated Dec. 12, Johnsen said SpaceX has approved an arrangement where new and existing investors and the company will buy up to $2.56 billion of shares from eligible shareholders at $421 a share.

"We

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