Chinese mainland stocks opened lower on Monday, pressured by news that bipartisan U.S. lawmakers introduced legislation to ban the use of China-made AI data center data transfer components in federal government systems. The Shanghai Composite Index opened down nearly 0.26% to 3,878 points, and the ChiNext fell 0.65% to 3,267 points. Hong Kong stocks, however, rose against the trend, with the Hang Seng Index opening up 0.18% to 24,554 points.