** Shares of XtalPi Holdings 2228.HK fall 5.5% to HK$9.51, their biggest intraday pct drop since August 1

** Stock hit its lowest since August 22, on track for fourth straight session of decline, if losses hold

** The intelligent robotics and drug discovery solutions provider plans sale of 285.92 million new shares, or 6.64% of the enlarged share capital, in a share placement programme, raising HK$2.65 billion ($339.25 million) for product iterations, upgrades and commercialisation

** The new shares will be issued at HK$9.28 each, representing a 7.75% discount to Thursday's close of HK$10.06 per share

** Hong Kong's healthcare index .HSCIH rises 2.1%, benchmark Hang Seng Index .HSI gains 0.7%

** YTD, stock up 61.9%

($1 = 7.8113 Hong Kong dollars)

(Reporting by Donny Kwok)

((donny.kwok@thomsonreuters.com))