** HK shares of China's Ping An Insurance (Group) 2318.HK fall 1.8% to HK$56.4, lowest since August 13

** Stock second-biggest pct loser on Hang Seng Finance Index .HSNF

** Shanghai-listed stock 601318.SS eases 1% to 59.90 yuan, lowest since August 22

** Co posts 8.8% y/y drop in H1 net profit, hurt by sluggish investment returns, weaker earnings of its banking unit amid slowing economy

** YTD, HK stock gains 22.8%, Shanghai shares up 14.4%

(Reporting by Donny Kwok)

((donny.kwok@thomsonreuters.com))