Tesla S&P 500 debut on Dec 21 to come all at once, rippling across markets

With about $11 trillion in funds tied to the S&P 500, money managers have been looking toward a few busy weeks ahead no matter how Tesla was included in the index

Tesla Inc. will be added to the S&P 500 Index in one shot on Dec. 21, a move that will ripple through the entire market as money managers adjust their portfolios to make room for shares of the $538 billion company.

Given Tesla’s massive market size, S&P consulted with investors in November, asking for feedback on whether the stock should be folded into the index all at once or in two parts, which would have been unprecedented. The electric-vehicle maker would be the seventh-biggest company in the S&P 500 at its current market value, falling between Berkshire Hathaway Inc. and Visa