Yangtze Optical Fibre And Cable is trading 12.06% down at HK$164.00; no confirmed same-day trigger has emerged, and the reason remains unclear. - Available reporting has not surfaced a clear September 28 company-specific catalyst. - Recent coverage said UBS raised its target price to HK$330 and reiterated Buy, while discussing possible sector overcapacity. That report predates this move and does not establish its cause.