** Shares of Sunny Optical Technology (Group) 2382.HK climb 5.1% to HK$66.1, on track for the biggest one-day pct rise since December 1, if trend holds

** Stock touches the highest level since January 16; second-biggest pct gainer in Hang Seng Tech Index .HSTECH, which is down 1.7%

** The automotive and mobile phone lens maker expects its 2025 net profit to jump 70%-75% y/y to 4.59-4.72 bln yuan ($660.3-$679.04 mln)

** Says the expected increase is driven by high-end upgrade of smartphone camera specifications and an improvement in product mix, resulting in an increase in selling prices and gross profit margins of handset lens sets and handset camera modules

** YTD, however, stock is down 2.8%, while benchmark Hang Seng Index .HSI is up 7.5%

($1 = 6.9510 Chinese yuan renminbi)

(Reporting by Donny Kwok)

((donny.kwok@thomsonreuters.com))