Coinspeaker Tesla (TSLA) Shares Slip 14% in Pre-Market after Missing Slot on Updated S&P 500 ListThe drop in TSLA shares price is largely attributed to the fact that the Tesla company hasn't been added as the new member to the S&P 500 index.Tesla (TSLA) Shares Slip 14% in Pre-Market after Missing Slot on Updated S&P 500 List