** Shares of XD Inc 2400.HK surge 26.7% to HK$71.9, their highest since April 2021; on course for third consecutive session of gains

** Stock set for the biggest one-day pct gain since March 2022; top pct gainer on Hang Seng Composite Index on information technology firms .HSCIIT, which is up 0.4%

** The game publisher and operator expects net profit of no less than 790 mln yuan ($110.01 mln) for six months ended in June, up 215% y/y, with revenue seen rising 37% y/y in H1

** Says robust performance of the company's self-developed games Ragnarok M: Classic, Heartopia and Torchlight: Infinite have led to the revenue growth and improvement of gross profit margin

** Hang Seng Tech Index .HSTECH gains 0.1%, benchmark Hang Seng Index .HSI adds 0.03%

** YTD, stock up 179.3%

($1 = 7.1814 Chinese yuan renminbi)

(Reporting by Donny Kwok)

((donny.kwok@thomsonreuters.com))