** Shares of AIM Vaccine 6660.HK jump as much as 19.3% to
HK$10.24 after co announces share buyback plan
** Stock on course for the biggest one-day pct rise since
March 13 if gains hold; third-biggest pct gainer in Hang Seng
Composite Index .HSCI
** Vaccine maker says it plans to repurchase up to 49.2 mln
H shares in the open market, representing 10% of total H shares
** Co says its operations, financial positions and sales of
existing products are normal, and the research and development
of pipeline vaccine candidates are progressing as planned
** Hong Kong's healthcare index .HSCIH rises 1.4%, while
Hang Seng Composite Index eases 0.7%, Hang Seng Index .HSI
down 0.9%
** Stock down 58.6% YTD
(Reporting by Donny Kwok)
((donny.kwok@thomsonreuters.com))