The Taiex, the Taiwan Stock Exchange's benchmark index, ended up 266.66 points, or 0.62 percent, at 43,386.41 after moving between 42,780.42 and 43,784.19. "AI enthusiasm kept dictating local trading as Amazon reported its largest quarterly revenue growth in over four years, easing worries over overspending on AI," Su said. Outside the semiconductor industry, iPhone assembler and AI server maker Hon Hai Precision Industry Co. rose 1.00 percent to end at NT$253.00. Machinery maker Hiwin Technologies Corp. rose 9.03 percent to close at NT$332.00, and its subsidiary Hiwin Microsystem Corp. also gained 9.14 percent to end at NT$197.00. According to the Taiwan Stock Exchange, foreign institutional investors sold a net NT$19.19 billion of shares on the main board Monday.