** Shares of AIA Group 1299.HK slip 2.2% to HK$72.5, their lowest since August 5, and on course for a fifth consecutive session of decline
** Stock set for the biggest one-day pct fall since August 15; top pct loser on the Hang Seng Finance Index .HSNF
** AIA Group reports a 23.5% y/y drop in first-half net profit to $2.53 bln
** Also reports a 14% increase in first-half value of new business (VONB), driven by strong demand for its insurance products in key markets of China and Hong Kong
** The Hang Seng Composite Index tracking financial stocks .HSCIF gains 0.4%, while the benchmark Hang Seng Index .HSI slips 0.02%
** YTD, stock up 30.8%
(Reporting by Donny Kwok)
((donny.kwok@thomsonreuters.com))