KEY POINTS
  • Tesla became an S&P 500 constituent officially at Monday's open with a 1.69% weighting in the index, the fifth largest.
  • It is the sixth biggest company in the large-cap benchmark when counting together the two share classes of Alphabet.
  • Investors, including passive fund managers and active managers that use the S&P 500 as a benchmark, rushed into Tesla shares in the final run-up, pushing the stock up nearly 6% on Friday to close at an all-time high of $695 a share.

Tesla's S&P 500 inclusion is official and its debut is not looking so good.

The shares shed 6.5% on Monday as investors who bought the stock in anticipation of its entry into the benchmark cashed in. The stock fell to its session low following a report that Apple is moving forward with its electric vehicle production.