https://apnews.com/1878c9f092a9b320ae59e441e253c598

LOS ANGELES (AP) — Adding a company to the benchmark S&P 500 stock index is typically a mundane exercise — except when it comes to a company like Tesla.

The market value of the electric car maker, led by Elon Musk, has soared to around $600 billion, making it the largest company ever to be added to the S&P 500. It's inclusion on Dec. 21 is expected to trigger a torrent of trading by institutional investors and a spike in volatility.