Shares of Nio Inc. NIO bounced 2.8% in premarket trading Wednesday, a day after they suffered their worst day in four years, and their third-worst day since going public in September 2018, in the wake of the China-based electric vehicle maker’s announcement of a $1 billion convertible bond offering. On Thursday, the stock had tumbled 17.1% to $8.55, the lowest close since June 26, and has plunged 44.7% since it closed at a 10-month high of $15.46 on Aug. 3. That was the biggest one-day percentage drop since they fell 20.2% on Sept. 24, 2019, while the record decline was 21.2% on March 6, 2019. Among other China-based…
