Japan's Nikkei 225 extended losses in morning trade on the 18th, dropping 689.20 points, or 1.00%, to 68,531.05 by 11:00 a.m. in Tokyo as selling in semiconductor-linked shares intensified into the midday break. The index had been down 307.71 points at 68,912.54 an hour earlier, underscoring how weakness in a handful of heavyweight names can pull the benchmark lower even when broader market breadth improves. Advantest and Tokyo Electron were the largest drags on the price-weighted index, while Fast Retailing, Kioxia Holdings and Murata Manufacturing also weighed heavily. SoftBank Group provided the biggest offset on the upside, followed by Fujikura, Mitsubishi Corp, Mitsui & Co and Trend Micro. On the Tokyo Stock Exchange Prime Market, 834 stocks rose, 662 fell and 54 were unchanged, compared with 608 advancers and 889 decliners at 10:00 a.m. Sector performance was mixed, with 16 of 33 industry groups advancing. Marine transportation led gains, ahead of oil and coal, mining and steel, while electric appliances, food products and services were among the weakest areas. The electric appliances segment, which includes many semiconductor-related names, showed notable weakness. The Nikkei had regained the 69,000 level in the previous session, but chip-related selling set the tone from the open on the 18th and pushed the index back into the mid-68,000 range. The widening fall from roughly 300 points to nearly 700 points during the morning session suggests investors' risk-averse stance is strengthening.