The Zhitong Finance App learned that optical communication concept stocks had the highest decline. As of press release, Zhongji Xuchuang (03308.HK) fell 5.51% to HK$738; Changfei Optical Fiber Cable (06869.HK) fell 5.26% to HK$118.9; Cambridge Technology (06166.HK) fell 4.33% to HK$78.45; Huiju Technology (01729.HK) fell 4.10% to HK$12.62.

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