Yangtze Optical Fibre And Cable is trading 4.6% higher at HK$129.70 amid an optical-fibre rebound; no clear company-specific explanation for the October 20 move surfaced in available search results. - On October 19, mainland optical-fibre names, including Yangtze Optical Fibre, rose alongside Hengtong Optic-Electric after Hengtong forecast strong first-three-quarter profit growth. - HKEX confirms Hong Kong markets closed October 19 and reopened October 20. The move followed a volatile technology sell-off, but U.S. technology gains are not established as a direct driver.