Some shareholders might object, but there is little they could do, legal experts say.

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

Investors who bought the automaker’s shares in its initial public offering became rich. As a result, many have a deep faith in Elon Musk, the chief executive of Tesla and SpaceX.

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

The billionaire has stated many plans for his businesses, but has delivered only some of what he said he would, when he said he would, according to a Times analysis.

The ways it set up its board and Mr. Musk’s pay appear to benefit him at the expense of other shareholders, corporate governance experts said.

California truckers have expressed strong interest in the Tesla Semi because it costs much less and can travel further on a charge than electric trucks sold by established manufacturers.