Tesla is poised to join America's benchmark S&P 500 stock index on Monday, giving millions more investors a stake in the electric car-maker.

Analysts say the financial milestone is a validation of a string of good news for Elon Musk's firm this year.

Demand for its cars was resilient this year despite the coronavirus pandemic.

But adding Tesla - the most frequently traded name on Wall Street - to the S&P could mean a bumpier ride for investors in funds that track the index.

"If Tesla continues to be as volatile as it has been, then we can expect the index to be a little more volatile," says Garrett Nelson, senior equity analyst at CFRA Research.

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