TuSimple Stock Plummets as Self-Driving Start-Up’s CEO Is Removed

Shares of the self-driving truck technology company


TuSimple


are tumbling as investors weigh a surprise management change.

Monday,


TuSimple


(ticker: TSP) said it has terminated CEO Dr. Xiaodi Hou because a continuing investigation by the audit committee of the board of directors led the board to conclude that a change of CEO was needed, the company said. Dr. Ersin Yumer, 


TuSimple


 executive vice president of operations, will serve as interim CEO while the company searches for a new chief executive.