The billionaire philanthropist testified on Wednesday in a closed-door congressional hearing about the Justice Department’s investigation of Jeffrey Epstein.

© Pete Marovich for The New York Times

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

© Jim Vondruska for The New York Times

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

© Chelsea Beck

Elon Musk’s potential new status as a trillionaire demonstrates in real time why there has been such a rapid rise in the concentration of wealth at the top.

© Nicolas Ortega

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.

© Callaghan O'Hare for The New York Times