Shares surged higher Monday in Asia and U.S. futures rose after a rebound in AI-related stocks like Nvidia spurred a rally on Wall Street. Tokyo's Nikkei 225 gained 1.9% to 50,455.07, helped by hefty gains for computer chip makers and other companies benefiting from the boom for artificial intelligence. Semiconductor maker Tokyo Electron jumped 6.7% while chip testing equipment maker Advantest gained 4.7%.