2627.HK stock Ab&B Bio Tech down 25.81% 16 Mar 2026 HKSE: market closed, outlook

The 2627.HK stock of Ab&B Bio Tech Co Ltd. plunged 25.81% to HK$46.00 at market close on 16 Mar 2026 on the HKSE in Hong Kong. Trading showed heavy volume at 2,171,200 shares versus an average of 452,029, signalling aggressive selling pressure after an intraday high of HK$59.00. The move follows a sharp gap down from the prior close of HK$62.00, and investors should weigh near-term volatility against the company’s long-term vaccine pipeline and stretched valuation metrics