The S&P 500 finished lower on Monday, with AI heavyweight Nvidia dipping ahead of its quarterly report this week, while investors awaited inflation data for clues about the path of interest-rate cuts by the Federal Reserve.

The tech-heavy Nasdaq also declined, but the Dow Jones Industrial Average was supported by gains in Caterpillar and American Express and finished just slightly up.

Nvidia dropped ahead of its report on Wednesday in what is set to be the U.S. stock market's most closely watched event of the week.

Some investors worried that anything short of a stellar forecast from Nvidia could shatter Wall Street's rally in AI-related companies, including Microsoft, Alphabet and Meta Platforms.

"Nvidia could disappoint. I think when you get to the point where the majority doesn't even suspect that there could be a piece of bad news, that's typically where you get it," warned Jake Dollarhide, chief executive of Longbow Asset Management in Tulsa, Oklahoma.

U.S.-listed shares of PDD Holdings tumbled after the Temu-owner missed market expectations for second-quarter revenue.

Tesla lost ground after Canada, following the lead of the U.S. and European Union, said it would impose a 100% tariff on imports of Chinese electric vehicles.

According to preliminary data, the S&P 500 lost 16.92 points, or 0.30%, to end at 5,617.69 points, while the Nasdaq Composite lost 148.52 points, or 0.83%, to 17,729.28. The Dow Jones Industrial Average rose 71.38 points, or 0.17%, to 41,246.46.

The energy sector index jumped following reports of oil supply disruptions amid the geopolitical conflict in the Middle East lifted crude prices.

Wall Street rallied on Friday, with the S&P 500 nearing record highs after Fed Chair Jerome Powell said "the time has come" to lower borrowing costs in the light of a diminishing upside risk to inflation and moderating labor demand.

Money markets suggest traders see a 70% chance of a 25 basis point interest rate cut and a 30% chance of a 50 basis point cut in September, according to the CME Group's FedWatch tool.

Friday's highly anticipated Personal Consumption Expenditure data for July, the central bank's preferred inflation gauge, could provide more insight into the policy easing trajectory.

Results from Dell, Salesforce, Dollar General and Gap are on tap this week.