Shaking up the status quo is Tesla’s stock-in-trade. Even so, the US electric car company’s admission to the S&P 500 benchmark on December 21 is going to cause a ruckus that low-profile index compilers might prefer to avoid.

Index membership means tracker funds have to buy the stock. The S&P 500 is weighted by market capitalisation and shares available for trading. Those parameters mean Tesla would be about the 14th largest company in the index by weighting (based on a market cap of $387bn)...

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