Yangtze Optical Fibre And Cable is trading at HK$174.90, up 4.05%, amid sector-led strength. - Reports cited overnight gains in U.S. optical stocks and continued AI-related demand for fiber and networking equipment. - DBS upgraded the company to Buy with a HK$259 target, citing AI data-center exposure and improved earnings visibility; the report did not explicitly link the upgrade to the share move. - Available reports support a sector-led explanation; no clear company-specific cause for the full move was established.