With SpaceX shares soaring 20 percent on their first day of trading, the world’s richest person crossed another milestone — one with 13 digits.

Elon Musk’s rocket company said it would sell more than 555 million shares at $135 each in its blockbuster initial public offering, which is set to begin trading on Friday.

Two Times tech reporters and their editor talk about assessing the sky-high valuation of the rocket and satellite maker, the potential economic impact of its public debut and the role of the world’s richest man in it all.

Antonio Gracias, an investor who has built a $65 billion stake in the company, exemplifies the economic upside of being Mr. Musk’s ally.

While Elon Musk may soon become a trillionaire, his rocket company’s market debut is set to change the lives of its current and former employees, too.

Wall Street is giving its richest clients velvet rope access to this week’s public listing of SpaceX, reflecting the growing importance of the wealth management business.

Johnny Hilbrant Partridge has found social media fame as PE Guy, a character who embodies obnoxious entitlement.

The billionaire’s new roots in Argentina are said to be partly motivated by concerns about the future of the United States and shared beliefs with Argentina’s right-wing leader.