SpaceX recently cemented its status as the world's most valuable private startup, with a share sale that valued it at about $350 billion. Meanwhile, OpenAI's last fundraising round valued it at $157 billion. Despite huge interest from investors, these names are among many fast-growing companies which are opting not to list their shares on public markets. Bloomberg's Bailey Lipschultz, who covers how companies go public, joins host Stephen Carroll to discuss.

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