Musk's SpaceX set to make biggest-ever initial public offering on Wall Street

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Elon Musk's space transport company SpaceX is set to begin trading on the US market on Friday with an offering of more than 555 million shares priced at at $135 each. The move is expected to place SpaceX in the top 10 of Wall Street's biggest companies and make Musk the world's first trillionaire.