Just Adding Tesla (TSLA) to the S&P 500 Moved the Whole Market

On Monday, December 21, Tesla (TSLA) joined the S&P 500 Index. In my 33 years in this business, I have rarely seen the inclusion of one single stock be able to move the metric meter on the overall index as much as this one.

TSLA went into the index with a weighting of 1.5% and a Price/Earnings (P/E) on 2021 estimates at around 170X.

Relative to this 1.5% allocation, its earnings will represent just 0.2% of the total S&P 500 earnings for 2021. The net effect will be to push up the S&P 500 P/E, as shown in the chart below.



As seen, whether one uses a market-cap or an aggregate approach, the overall S&P 500 P/E will move up from the addition of just this one stock alone.

Noteworthy, this is off of valuation multiple levels that are already at fairly lofty levels. When looking at the S&P 500 P/E through the prism of its historical percentile rank, this valuation multiple is already at a percentile in excess of 90%.

The inclusion of Tesla now only pushes it even higher.

A chart of TSLA stock performance year-to-date relative to the S&P 500 is show below. One other amazing observation here is that if Tesla had been an S&P 500 constituent all year long (in other words, added on January 1, 2020), the share’s performance by itself would have single handily lifted the total index return by roughly 200 basis points, from around 15% to 17%!

This would seem to indicate that the future performance of this one stock alone could have a measurable impact on the return of the S&P 500.


Again, all of the above from the inclusion of one stock to the S&P 500 is astounding.

The fact that an enormous amount of professional money managers are indexed to this benchmark, which is now linked to this one stock to the degree that it is, should be considered and heeded by all investors.

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Gary has more than 30 years of industry experience, which includes research analysis and portfolio management for both retail and institutional accounts. He worked as a Senior Vice President at Wells Fargo Advisors and Wells Fargo Investment Institute for approximately 14 years in total, where he was a senior portfolio manager for both equity and asset allocation portfolios. He was also involved in investment manager due diligence and selection for the firm’s multi-manager portfolio models. Prior to joining Wells Fargo, Gary held senior-level investment management positions with several registered investment advisory organizations. He has been a Chartered Financial Analyst (CFA®) charter-holder since 1989. The CFA is a professional credential earned by investment management professionals after successfully passing three years of rigorous examinations and recording several years as a practising professional within the industry. Gary received his Bachelor of Science in Engineering from Purdue University and his M.B.A. in Finance from The University of Missouri. Additionally, Gary holds his FINRA SIE, Series 7 and Series 66 securities registrations as well as his Missouri Life Accident & Health insurance license. He is a member of the CFA Society of St. Louis and the Financial Executives Networking Group. He resides in Kirkwood, MO with his wife Kathy, and they have three adult age children, Aly, Ryan and Josh.