NEW YORK >> Big technology and internet companies came under heavy selling pressure again today, leading to broad losses across the stock market. The Dow Jones Industrial Average briefly fell 500 points.

Apple, Microsoft and Amazon, the most valuable companies on the market, sustained some of the worst losses. Facebook, another longtime investor darling that has been falling out of favor, also fell sharply.

Mark Hackett, chief of investment research at Nationwide Investment Management, said investors are dumping the high-profile technology companies that have dominated the market recently. He said investors are picking companies based on traditional profit and revenue figures instead of the kind of user growth figures favored by tech companies.

“These things had outperformed the S&P by a mile over the last three years,” he said, but that’s changed now. “On good days they’re not the leaders, and on bad days they’re the laggards.”

The S&P 500 index fell 47 points, or 1.8 percent, to 2,688 as of 3:40 p.m. Eastern time. The Dow Jones Industrial Average sank 428 points, or 1.7 percent, to 24,984. It was down as much as 512 earlier.

The Nasdaq composite skidded 219 points, or 3 percent, to 7,028. The technology-heavy index is on track for its worst loss in almost a month.

The Russell 2000 index of smaller-company stocks lost 29 points, or 1.9 percent, to 1,498.

The jittery trading came after two days of gains last week as investors hoped that the U.S. and China were moving closer to settling their costly trade fight, which has been a major uncertainty for the market. Those hopes faded after the two countries clashed at a Pacific Rim summit over the weekend.

A steep loss for Boeing, a major exporter which would stand to suffer greatly in a protracted trade war, weighed heavily on the Dow. Boeing gave up 4.8 percent, but is still one of the best-performing stocks in the 30-stock index. Apple fell 4.2 percent on renewed worries that iPhone sales could slow, Microsoft lost 3.6 percent and Amazon gave back 5.2 percent.

High-dividend stocks like real estate companies and utilities, which investors favor when they are fearful of market turmoil, held up better than the rest of the market.

Nissan sank after its chairman was arrested on misconduct charges.

The disagreements between the U.S. and China at the Asia-Pacific Economic Cooperation meeting left investors feeling pessimistic about the prospects for a deal that would end the trade tensions between the world’s two largest economies. For the first time in almost 30 years, leaders at the summit could not agree on a joint declaration on world trade.

Talks between the U.S. and China are continuing ahead of a meeting between Chinese President Xi Jinping and President Donald Trump planned for the G-20 summit later this month.

Among tech stocks, Facebook sank 5.5 percent to $131.85, Microsoft fell to $104.44 and chipmaker Nvidia dropped another 11 percent to $146.38. Nvidia said last week that it had a large number of unsold chips because of a big drop in mining of cryptocurrencies.

The S&P 500 index of technology companies has now plunged 13.5 percent since the end of September.

Nissan said its chairman, Carlos Ghosn, was arrested today and will be dismissed from the company after allegedly under-reporting his income. Nissan said an internal investigation found Ghosn under-reported his income by millions of dollars and engaged in other “significant misconduct.”

U.S.-traded shares of Nissan lost 5.8 percent to $16.90. In Paris, shares of Nissan’s partner Renault dropped 8.4 percent.

Amazon dropped to $1,509 and Nike slid 3.2 percent to $72.36. Netflix lost 5.6 percent to $270.21.

Boeing sank to $320.04 and Caterpillar fell 3.1 percent to $125.90. Defense contractor Raytheon lost 3.2 percent to $176.18.

Benchmark U.S. crude reversed an early loss and rose 0.5 percent to $56.76 a barrel in New York. U.S. crude prices have dropped for six weeks in a row and are trading around their lowest level in about nine months.

Brent crude, used to price international oils, was little changed at $66.79 a barrel in London.

Wholesale gasoline added 0.4 percent to $1.58 a gallon. Heating oil gained 0.6 percent to $2.09 a gallon. Natural gas surged 10 percent to $4.70 per 1,000 cubic feet.

The parent company of California utility Pacific Gas & Electric fell again after it disclosed that it had a power line failure near the start of a deadly wildfire the morning the fire began. The Mercury News of San Jose reported Saturday that the company said in a filing that it had an outage at 6:45 a.m. on Nov. 8 in Concow. Authorities say 76 people have been confirmed dead in the Camp Fire.

PG&E stock fell 4.8 percent to $23.21. The stock has lost half its value since Nov. 8 in spite of a big rally on Friday.

Gold rose 0.2 percent to $1,225.30 an ounce. Silver inched up 0.1 percent to $14.40 an ounce. Copper held steady at $2.80 a pound.

Bond prices rose. The yield on the 10-year Treasury note fell to 3.05 percent from 3.07 percent. The dollar slipped to 112.54 yen from 112.83 yen. The euro rose to $1.1453 from $1.1412. The pound rose to $1.2855 from $1.2831.

France’s CAC 40 gave up 0.8 percent and Germany’s DAX slid 0.9 percent. Britain’s FTSE 100 slipped 0.2 percent. Japan’s benchmark Nikkei 225 rose 0.7 percent and Hong Kong’s Hang Seng added 0.7 percent. South Korea’s Kospi gained 0.4 percent.