Elon Musk’s rocket company said it would sell more than 555 million shares at $135 each in its blockbuster initial public offering, which is set to begin trading on Friday.

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The SpaceX I.P.O. proves the stock market has become a hype machine.

Brendan Carr, the chairman of the Federal Communications Commission, has greenlighted regulatory requests for the company’s Starlink satellite internet service and lavished praise on its chief executive.

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