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S&P 500 Seasonality: The Chart That Sends Shivers Down Spines In September, But With Peculiar Twist



S&P 500 Seasonality: The Chart That Sends Shivers Down Spines In September, But With Peculiar Twist

Benzinga – by Piero Cingari, Benzinga Staff Writer.

In the world of financial markets, September brings a sense of dread that’s hard to shake. It’s the month that has Wall Street on edge, and for good reason.

A recent in-depth seasonality analysis on the S&P 500 Index conducted by Bank of America analyst Stephen Suttmeier, CFA, paints a rather chilling picture.

Spanning nearly a century of market data dating back to 1928, September emerges as the worst month of the year for the U.S. stock market.

The statistics are a stark reminder: September has witnessed the S&P 500 closing positively only 44% of the time, a revelation that already points to a rather unfavorable track record. Furthermore, the average return in September shows a decline of 1.2%, the worst than in other month of the year.

Even when narrowing the lens to focus on last quarter of a century, September’s bearish sentiment remains intact. The data reflects an average decline of 0.53%, the highest among all the months.

Chart: Monthly Returns Of S&P 500 Index (1998-2023)

Why There’s A Glimmer Of Hope In 2023

According to the Bank of America study, when the S&P 500 posts year-to-date gains through August, September has historically shown better performance, with positive returns occurring 49% of the time. Yet these gains are relatively modest, with an average return of 0.08%.

Conversely, when the S&P 500 is in the red year-to-date through August (although this isn’t the case for 2023), September has historically struggled. It has seen positive returns only 34% of the time, and these returns are notably negative, averaging a negative 3.61%.

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Delving deeper into the data, an exceptionally strong rally of 20% or more in the S&P 500 year-to-date through August might not bode well for September and the rest of the year. In this scenario, September shows positive returns in only 45% of cases, with an average return of negative 0.67%

There is a silver lining. The most robust September and subsequent year-end returns tend to occur when the S&P 500 registers more moderate gains of 10% to 20% year-to-date through August.

Out of the 23 instances when the S&P 500 had posted year-to-date gains ranging between 10% and 20% through August, it exhibited positive performance in an impressive 65% of those cases. The average return during these instances amounted to a noteworthy 0.77%.

In 2023, the SPDR S&P 500 ETF Trust (NYSE:SPY) has indeed delivered a year-to-date return of 17.4% through August, fitting snugly into this historically favorable “sweet spot.”

Statistic
S&P 500

September returns

for all years

(since 1928)
September returns

when the S&P 500

is up 10%-20% YTD

through August
September returns

when the S&P 500

is up 20%+ YTD

through August

Average -1.16% 0.77% -0.67%
Median -0.49% 1.49% -0.65%
% of time up 44.21% 65.22% 45.45%
Max 14.40% 4.84% 8.31%
Min -29.94% -8.54% -12.35%
Std Dev 5.74% 2.86% 5.50%
#obs 95 23 11

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Photo via Pixabay.

© 2023 Benzinga.com. Benzinga does not provide investment advice. All rights reserved.

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