SpaceX market cap tops $2 trillion after shares of Elon Musk's rocket company gain 19% on debut

Tesla, another Musk-led company, swung between gains and losses in Friday's session. The electric vehicle maker — which is a top stock among retail investors — is worth less than SpaceX by market cap.Retail traders raced to get in on SpaceX's IPO given their broad support for Musk following Tesla's success. Yet SpaceX allocated a smaller-than-expected portion of its IPO to the retail class, a source told CNBC.Still, SpaceX was the most-bought stock by retail traders on net in Friday's trading, data from VandaTrack shows. It was also among the most-discussed stocks in Reddit's popular WallStreetBets forum in the days leading up to the IPO, according to meme stock tracker Breakout Point.

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