Tesla loses a third of its value in a week after missing out on S&P 500

Tesla's brutal losing streak accelerated on Tuesday as the company’s snub from the S&P; 500 and news of increased competition from General Motors meant it lost almost a fifth of its value. Elon Musk’s electric car company declined by more than 20pc, meaning it has lost around a third of its value since the start of last week. Tesla has been one of the biggest victims of a Wall Street sell-off in recent days that continued on Tuesday after Monday’s market holiday. The tech-h