The S&P 500 and the Nasdaq hit over one-week lows on Monday, as the surging popularity of a low-cost Chinese artificial intelligence model knocked shares of chipmaker Nvidia and other companies benefiting from investments into the technology.

The Nasdaq Composite has erased early gains as losses for shares of Microsoft Corp. and Nvidia Corp. accelerated, weighing on the broader index. Microsoft shares were down more than 6% earlier, while Nvidia was down nearly 4%,