NEW YORK — U.S. stocks rose Monday and added to their gains from last week, as technology companies once again led the way.

The S&P 500 rose 52.95, or 1%, to 5,180.74. The Dow Jones Industrial Average added 176.59, or 0.5%, to 38,852.27, and the Nasdaq composite jumped 192.92, or 1.2%, to 16,349.25.

Tech stocks were at the forefront, with familiar ringleaders Nvidia and Super Micro Computer again pulling the market higher. They’ve had a couple hiccups recently, but a frenzy around artificial-intelligence technology has Nvidia up 86.1% for the year so far after Monday’s 3.8% gain. Super Micro is up 192.1% after its gain of 6.1%.

Vistra, an electricity and power generation company, rose 2.1% after investors learned it will join the widely tracked S&P 500 index on Wednesday. Freshpet jumped 10.4% after reporting better results than expected in large part because it sold 30% more food for cats and dogs, and Berkshire Hathaway added 1% after Warren Buffett’s company reported its latest quarterly results over the weekend.

They helped to offset a 9.7% slide for Spirit Airlines, which reported a slightly worse loss than expected. The carrier said it’s facing increased competition in many of its markets, particularly between the United States and Latin America.

Apple slipped 0.9% after Berkshire Hathaway revealed it had pared its stake in the tech giant.

The U.S. stock market has been swinging sharply since setting a record at the end of March. It sunk for weeks on fears that stubbornly high inflation would prevent or at least delay the Federal Reserve from delivering the cuts to interest rates that Wall Street craves.