Sunny Optical climbs after unit submits HK listing application

** Shares of Sunny Optical Technology Group climb 2.7% to HK$63.65, on track for their biggest one-day pct gain since January 2** Stock fourth-biggest pct gainer in Hang Seng Tech Index , which is up 0.6%** Automotive and mobile phone lenses maker says its vehicle-related optical business spin off unit submitted a listing application to the Hong Kong bourse for a separate listing on the mainboard of the stock exchange** YTD, stock down 3.1%, while benchmark Hang Seng Index is up 5.9%