CNBC Daily Open: Tech firms take center stage

This report is from today's CNBC Daily Open, our international markets newsletter. CNBC Daily Open brings investors up to speed on everything they need to know, no matter where they are. Like what you see? You can subscribe  here .

Nvidia shares fall after China opens investigation 
Shares of artificial intelligence darling Nvidia were under pressure after a regulator in China said it was investigating the chipmaker over possible violations of the country's antimonopoly law. This investigation was in relation to Nvidia's 2020 acquisition of Israeli firm Mellanox and some agreements made during the acquisition, the Chinese government said Monday. 

26-year-old detained by police in connection with fatal shooting of UnitedHealthcare CEO
University of Pennsylvania graduate Luigi Mangione was detained by police as a "strong person of interest" in the killing of UnitedHealthcare CEO Brian Thompson after police found him carrying a pistol, a silencer, a mask and fake identification cards. Mangione had in his possession a suspected "ghost gun" — which lacks a serial member — capable of firing 9 mm rounds, authorities said.

China trade in November misses expectations 
China's exports and imports both missed expectations in November, fueling worries over the health of the Chinese economy. Exports rose 6.7% in U.S. dollar terms from a year ago, sharply lower than the 12.7% growth in the previous month and missing forecasts of a 8.5% rise. Import data surprised with a decline of 3.9%, compared to a 0.3% rise expected by economists.

Most Asia markets gain, breaking ranks with Wall Street 
Most markets rose in Asia, shrugging off the weaker close overnight on Wall Street. South Korea's Kospi led gains, rising 2.4%. The S&P 500 and Nasdaq