** Shares of Li Auto 2015.HK jump 11.1% to HK$125.7, the highest since February 25

** Stock leading rise in Hong Kong-listed Chinese automakers as authorities pledge to regulate excessive competition

** The Chinese electric vehicle $(EV)$ maker's Hong Kong stock is on track for sixth straight session of gain

** Company also says its vehicle model i8 is available for pre-order, price to be announced on the official launch on July 29

** China's cabinet on Wednesday pledged to regulate what it called "irrational" competition in the country's EV industry, vowing to strengthen cost investigation and price monitoring

** Rivals' shares rise, with Xpeng 9868.HK, BYD 1211.HK, Leapmotor 9863.HK, Dongfeng Motor 0489.HK and Geely Automobile 0175.HK climbing between 1.1% and 5%

** Hang Seng Automobile Index .HSAMI jumps 3% to 4,315.63 points, highest since May 26, while benchmark Hang Seng Index .HSI gains 0.1%

(Reporting by Donny Kwok)

((donny.kwok@thomsonreuters.com))