SpaceX's record IPO made Elon Musk the world's first trillionaire and created thousands of employee millionaires.

The stock rose nearly 20% on its debut, with retail investors placing so many orders that Robinhood experienced outages.

The company became the sixth-largest publicly traded US firm, with OpenAI and Anthropic expected to follow with their own IPOs.

AI-generated summary was reviewed by a CNN editor.

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