The Hang Seng Tech Index tumbled 4.5% as of 3:51 p.m. local time, with Tencent Holdings Ltd. dropping by almost twice that amount in its worst day in five weeks.The Hang Seng Tech Index tumbled 4.5% as of 3:51 p.m. local time, with Tencent Holdings Ltd. dropping by almost twice that amount in its worst day in five weeks.Read More