On Thursday Tesla stock reached an all-time high, briefly trading at $507.76 per share. Tesla’s stock has been on a tear since the S&P Dow Jones Indices announced this week that it will include the carmaker to the benchmark index prior to trading on Monday, Dec. 21. Money managers with funds that track the S&P 500 will need to buy the stock for their portfolios.
Read moreTesla surges back to record high today ahead of joining the S&P 500