** Sunny Optical Technology Group 2382.HK slips 9% to HK$77.85, lowest since February 6

** Stock set for biggest one-day pct drop since October 8, 2024; second-biggest pct loser on Hang Seng Tech Index .HSTECH

** Automotive and mobile phone lenses maker's 2024 profit attributable soars 145.5% y/y, rev climbs 20.9% y/y

** Citi ("buy") says H2 FY24 net profit in line with consensus, gross margin looks on par with guidance while operating profit misses consensus by 15.4%

** Adds co's H2 FY24 rev 1.6% below consensus

** YTD, stock up 13.4%

(Reporting by Donny Kwok)

((donny.kwok@thomsonreuters.com))