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SpaceX founder Elon Musk said he gave the company "less than a 10% chance of succeeding at all" when it first started, and it is now going public "with the largest IPO ever".
Musk made the remarks from the company's headquarters in southern Texas before it officially began trading on the US stock exchange.
Company officials celebrated the ceremonial start of trading at twin ceremonies at the Nasdaq headquarters in New York City and from the Texas headquarters.
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