** Shares of CARsgen Therapeutics Holdings 2171.HK jump as much as 42.6% to HK$15.50, their biggest intraday pct gain since debut in June 2021

** Stock hits its highest level since February 26

** The Chinese cell therapies developer says its 2025 net loss narrowed to 103 million yuan ($14.89 million), from 798 million yuan loss in 2024, due to decrease in research and development, and administrative expenses, among others

** YTD, stock down 7.6%, Hang Seng Biotech Index .HSBIO down 1.8%

($1 = 6.9188 Chinese yuan)

(Reporting by Donny Kwok)

((donny.kwok@thomsonreuters.com))