Nvidia Rally Mints Millionaires Too Busy to Bask in New Wealth

It’s a summer day in Santa Clara, California, and an assortment of luxury cars — Porsches, Corvettes, Lamborghinis — take up parking spots previously occupied by humbler models. Some have new paint jobs in the lime green from Nvidia Corp.’s logo. And they are stuck where their owners want to be: at the office.

Nvidia stock has gained 3,776% since the start of 2019 as the company benefits from selling the main chip necessary for artificial intelligence work, minting many new multimillionaires in the process. But the work hours are just as grueling and high-stress, current and former employees said, leaving little ...