Tesla debuts into S&P after frantic Friday trading

The company, headed by billionaire Elon Musk, will become the most valuable ever admitted to Wall Street's main benchmark and will account for 1.69% of the index, according to S&P Dow Jones Indices' analyst Howard Silverblatt. The shares have surged some 70% since mid-November, when Tesla's debut in the S&P 500 was announced so far in 2020.