** Hong Kong shares of China's Trip.com Group 9961.HK jump 8.9% to HK$558, highest level since Feb 17
** Set for biggest one-day gain since Sept 27; top gainer on Hang Seng Tech .HSTECH, Commerce & Industry indexes .HSNC
** Travel platform's Q2 revenue up 16% YoY, net profit surged 26.3% YoY; announces $5 bln share repurchase program
** On Wednesday, co's U.S. shares TCOM.O climbed 0.6% to $65.29
** Citi ("buy" rating, $78 PT) says results "solid" with revenue slightly beating estimates; buyback program exceeds some investors' expectations
** Jefferies ("buy" rating, $80 PT) notes Q2 revenue, operating profit, non-GAAP earnings all ahead of forecasts
** YTD, HK shares up 2.5%
($1 = 7.1529 Chinese yuan renminbi)
(Reporting by Donny Kwok)
((donny.kwok@thomsonreuters.com))