Hong Kong stocks slide on WuXi Biologics’ record 32 per cent crash after US puts 33 Chinese firms on red-flag list

• WuXi Biologics slumped by as much as 32 per cent as firm was listed with 32 others in the so-called “unverified list” by the US
• Alibaba extended decline amid speculation about insider selling after the e-commerce group’s plan to register new American depositary shares