Nvidia reduced its stake in British chipmaker Arm Holdings by approximately 44% and sold its holdings in Serve Robotics and SoundHound AI in the fourth quarter, according to a regulatory filing on Friday.

China’s purchases of chipmaking equipment are projected to drop this year after three years of growth, as the industry faces overcapacity and increasing restrictions from U.S. sanctions, according to a report from consultancy TechInsights.

Nvidia’s shares fell in early Monday trading following reports that Chinese officials have launched an antitrust investigation into the dominant AI chipmaker.

Nvidia, the US chipmaking giant, announced Wednesday that it posted a $19 billion profit last quarter, fueled by record-high revenue and strong demand for its hardware powering artificial intelligence (AI).