The S&P 500 was 0.2% higher in midday trading after setting an all-time high for the 31st time this year before Wednesday’s holiday. The Dow Jones Industrial Average was up 69 points, or 0.2%, as of 11 a.m. Eastern time, and the Nasdaq composite added 0.2% to its own record.

Nvidia rose 2.8% after supplanting Microsoft on Tuesday as the most valuable company on Wall Street with a total market value of more than $3.3 trillion. It’s been on an incredible run as the main beneficiary of the stock market’s frenzy around artificial-intelligence technology.

Nvidia’s chips are helping to power the move into AI, which proponents see producing explosive growth in productivity and profits, and it’s already up 181.5% this year after more than tripling last year.

The gains for Nvidia and other AI winners have helped prop up the stock market despite some weakness in the U.S. economy. High interest rates meant to grind down inflation have hurt the housing market and manufacturing in particular, while lower-income households are showing signs of struggling to keep up with still-rising prices.

Winnebago Industries, for example, has been introducing “economical” trailers to attract customers amid “inconsistent retail patterns.” But its profit and revenue for the latest quarter fell short of analysts’ expectations. Shares of the maker of motorhomes and pontoons fell 3.9%.

In a show of how powerful AI can be, Accenture rose 6.2% even though the consulting and professional-services company reported weaker profit and revenue for the latest quarter than expected. In its earnings report, it highlighted how it won over $900 million in new bookings for generative AI, bringing the total for its last three quarters to more than $2 billion.

Among the few stocks to do even better than Accenture was Super Micro Computer, which sells server and storage systems used in AI and other computing. It jumped 7.9% to bring its gain for the year so far to 249.3%.

The supernova for AI stocks has helped mask some weakness underneath the surface in the market. That can be a worrying signal for market watchers, who would prefer to see a large number of companies pushing the market higher instead of just a handful.

“It has been common in past cycles, as the stock market is coming into a meaningful top, that the biggest growth names are the ones carrying the load,” according to Scott Wren, senior global market strategist at Wells Fargo Investment Institute,

Treasury yields ticked higher following a spate of mixed reports on the economy. The number of U.S. workers filing for unemployment benefits eased last week, but not by as much as economists expected. A separate report said manufacturing in the mid-Atlantic is growing, but not as quickly as economists thought. Home builders, meanwhile, broke ground on fewer new homes last month than expected.

The hope on Wall Street is actually for a slowdown in the U.S. economy’s growth. That could help keep a lid on inflationary pressures and convince the Federal Reserve to cut its main interest rate later this year. Such a cut would release pressure on the economy and boost investment prices.

Fed officials have indicated they could cut their main interest rate once or twice this year, down from its highest level in more than 20 years. Many traders on Wall Street, meanwhile, are expecting two or more, according to data from CME Group.

The yield on the 10-year Treasury climbed to 4.27% from 4.22% late Tuesday. The two-year yield, which more closely tracks expectations for the Fed, rose more modestly to 4.74% from 4.71%.

Some other central banks have already begun removing the brakes from their economies.

The Swiss National Bank cuts its main rate on Thursday. The Bank of England, though, kept its main rate steady.

Stock indexes rose across much of Europe following the moves. The French CAC 40 gained 1.3% to recoup more of its losses from last week following jolting results from elections. Asian indexes were mixed.