TAIEX had its longest losing streak in three months. United Microelectronics Corp (UMC, 聯電) fell after Xilinx Inc said the company would no longer be its sole chip supplier and named Toshiba Corp as a manufacturing partner.
The California-based Xilinx, the world's biggest maker of programmable chips, said Toshiba will make semiconductors used in consumer electronics and automobiles.
The benchmark fell for the sixth day, shedding 10.25, or 0.2 percent, to 5,820.82. That is the longest losing run since the seven days to July 20. The index fell as much as 0.8 percent after the country was struck by a magnitude 7 earthquake, its strongest since the temblor that killed 2,500 people in 1999.
UMC, the world's second-largest supplier of made-to-order chips, fell 1 percent to NT$20.
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