S&P 500 and the US presidential election

Aug 27th, 2020 | By | Category: Equities

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By Hamish Preston, Associate Director, US Equity Indices, S&P Dow Jones Indices.

S&P 500 and the US presidential election

S&P 500 and the US presidential election

2020 has certainly been an extremely unusual year as economies, companies, and individuals have grappled with the impacts of Covid-19.

Although this year’s market movements have arguably been even more difficult to predict than usual, and many active managers were wrong-footed earlier this year, investment outlooks have kept at least one eye on the outcome of one extremely well-telegraphed event – the US presidential election.

With November’s election less than three months away, what is the S&P 500’s historical record around US elections?

Exhibit 1 shows that the S&P 500 typically rose during US presidential election years: the benchmark posted a positive price return in 17 of the last 23 election years, giving it a hit rate of roughly 74% and an average return of 7.05%. But there was substantial cross-sectional variation in election returns: there was a return spread of over 75% between the S&P 500’s best election year (1928) with its worst (2008).

Source: S&P Dow Jones Indices.

Before anyone uses Exhibit 1 to make inferences about the potential impact of the 2020 election on the S&P 500, it is important to recognize that the performance of the S&P 500 during election years has typically been similar to its performance during other years. Exhibit 2 shows that the average (and median) calendar year S&P 500 price return, volatility, and risk-adjusted returns have been similar across election and non-election years.  Similar results were also observed during the fourth quarter, albeit with slightly greater differences.

Source: S&P Dow Jones Indices.

Although it can be difficult to identify a clear impact of US presidential elections at a market level, there appears to have been a considerable impact at a sector level. Exhibit 3 shows the average range in monthly S&P 500 sector returns – calculated as the best-performing sector minus the worst-performing sector – between 1990 and 2019.  The highest average range (15.18%) was observed in November during election years, far above the 10.8% average difference across all months. Notwithstanding the relatively small sample size, this suggests that election impacts were typically observed when investors priced-in the anticipated impact of the election winner’s policies on different market segments.

Source: S&P Dow Jones Indices.

One recent example of this dynamic came in the 2016 election. While the S&P 500 rose around 4% in November 2016, a whopping 19.34% separated the best-performing sector (Financials) and the worst-performing (Utilities). Hence, correctly identifying who would win the 2016 Presidential election and the anticipated sector impact offered considerable value in 2016.

Source: S&P Dow Jones Indices.

As a result, although the S&P 500 has been unperturbed by election outcomes, historically, evidence suggests it may be worthwhile to consider the potential benefits of using sectors to express views. Indeed, not only can picking sectors offer around half the potential value of stock-picking – Exhibit 5 shows that the average monthly S&P 500 sector dispersion (3.08%) was around half the average S&P 500 stock dispersion (6.77%) – but S&P 500 sectors have offered greater capacity for investors looking to express views.

Source: S&P Dow Jones Indices.

(The views expressed here are those of the author and do not necessarily reflect those of ETF Strategy.)

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