How Elon Musk Cuts Costs at Tesla, SpaceX and X

Mr. Musk dug into his companies’ budgets, preferring to cut too much rather than too little and to deal with the fallout later. Under Donald Trump, he is set to apply those tactics to the U.S. government.

Jeff Bezos, Elon Musk and the Billions of Ways to Influence an Election

The world’s richest men have their own rocket fleets, their own media and their own schemes to succeed with Donald J. Trump.

Why GM’s Mary Barra Still Believes in EVs, Despite Slow Sales

Mary Barra, G.M.’s chief executive, said that the company had fixed battery-manufacturing problems and that its electric vehicles would soon be profitable.

How Elon Musk’s Security Detail Has Grown Following Death Threats and Stalkers

As threats to his personal safety have become graver, the world’s richest man has barricaded himself behind a phalanx of bodyguards that operates like a mini-Secret Service.

How Elon Musk Is Influencing Donald Trump

Their fast-evolving political friendship has become a potential minefield, as Mr. Musk’s sprawling businesses may present conflicts of interest if Mr. Trump is elected in November.

Tesla Q2 Earnings Report Reveals 45% Profit Drop Amid Weak E.V. Sales

The company led by Elon Musk is selling fewer electric cars, and its big bets on driverless taxis and artificial intelligence could take many years to pay off.

Elon Musk’s Politics May Be Pushing Some Buyers Away From Tesla

The Tesla chief executive’s polarizing statements have alienated some potential customers and may be partly responsible for a recent slump in sales.

How Electric Car Batteries Might Aid the Grid (and Win Over Drivers)

Automakers are exploring energy storage as a way to help utilities and save customers money, turning an expensive component into an industry asset.