** Shares of Fangzhou Inc 6086.HK drop as much as 20.2% to HK$3.01, their biggest intraday pct decline since April 7

** Fangzhou, an online chronic disease management services provider, plans sale of 45.2 million new shares to key shareholder, raising HK$150 million ($19.24 million) for development of AI-driven chronic disease management platform and for working capital

** The new shares will be issued at HK$3.32 each, representing an 11.9% discount to Monday's close of HK$3.77

** The key shareholder will buy new shares following sales of the same amount of existing shares at the same price to third-party investors

** YTD, stock up 36.4%, Hang Seng Compiste Index tracking healthcare stocks .HSCIH up 10.1%

($1 = 7.7980 Hong Kong dollars)

(Reporting by Donny Kwok)

((donny.kwok@thomsonreuters.com))