An index that tracks every US stock outside the S&P 500 more than doubled the gains of the benchmark in 2020

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An index that tracks every US stock outside the S&P 500 more than doubled the gains of the benchmark in 2020
Traders work on the floor of the New York Stock Exchange shortly after the opening bell in New York, U.S., March 17, 2020.Lucas Jackson/Reuters
  • The S&P Completion Index tracks every US stock that's not included in the S&P 500. It its up nearly 33% in 2020, more than double the benchmark's 14% gain.
  • The completion index is typically associated with small and mid-cap stocks, but until this week, it counted one very high profile company among its top constituents: Tesla.
  • Tesla's 665% gain in 2020 likely drove the completion index's ride upwards, according to a report in The Wall Street Journal.
  • Visit Business Insider's homepage for more stories.

A stock index that tracks all US stocks except those in the S&P 500 has returned more than double what the benchmark index earned this year.

The index, called the S&P Completion Index, is up nearly 33% this year, compared to a 14% gain for the S&P 500 during the same time period.

The completion index is typically associated with small and mid cap stocks that don't make it into the S&P 500. But one very high profile company was, until recently, counted among the constituents of the S&P Completion Index: Tesla.

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Before the electric vehicle maker joined the S&P 500 on Monday, it was the darling of the completion index. Its 665% gain in 2020 likely drove the index's gains, according to a report in The Wall Street Journal.

The S&P Completion Index is up 2% since the beginning of this week. Meanwhile, the S&P 500 has stayed relatively flat in that same time period.

The completion index is also home to other 2020 star performers, including Zoom (up over 460% YTD), Square (up 272% YTD), and Moderna (up over 560% YTD). In total the index tracks 3,231 constituents, according to S&P Global.

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