A Well Known Seasonal Phenomenon in the US Market – Is There More to It?

I already discussed the “turn-of-the-month effect” in a previous issues of Seasonal Insights, see e.g. this report from earlier this year. The term describes the fact that price gains in the stock market tend to cluster around the turn of the month. By contrast, the rest of the time around the middle of the month is typically less profitable for investors.

 

Due to continual monetary inflation in the fiat money system and the “survivor bias” inherent in stock market index construction, nominal stock prices are rising 67% of the time. Nevertheless the long term uptrend in nominal prices is subject to countless recurring seasonal patterns. The market as a whole on average tends to generate the bulk of its gains only at certain times.  [PT]

 

With respect to the US stock market, I also showed how the “turn-of-the-month effect”” evolved over time, when it was particularly pronounced and when it tended to wane.  Does this effect have an impact on stock markets in other countries as well? I will examine this question in this issue of Seasonal Insights.

First let us briefly recapitulate how the “turn-of-the-month effect” affects the US stock market.

 

S&P 500 Index: Gains are Mainly Generated Around the Turn of the Month

Take a look at the following chart. It shows the average pattern of the S&P 500 Index in the course of a calendar month since 1928. The horizontal axis shows the time of the month, the vertical axis the return of the seasonal index.

In other words, in the middle of the chart we see the market’s typical trend during the mid-month period, on the left hand side its trend right after the beginning of the month and on the right hand side its trend just ahead of the end of the month.

 

S&P 500 index, seasonal pattern in the course of the average month over the past 90 years. The bulk of the stock market’s gains are typically generated around the turn of the month.

 

It is quite obvious that the market’s gains are typically generated at the beginning of the month and shortly before it ends. In the remaining time period average returns were actually negative. This is the phenomenon described by the term “turn-of-the-month effect”.

Does it exist in other countries as well?

 

The 11 Largest Stock Markets Under the Magnifying Glass

In order to answer this question, I have taken a look at the popular benchmark stock indexes of the eleven countries with the largest stock market capitalization from 1970 onward, or starting from the earliest year from which continuous price data are available.

I have measured the average return of investing in these indexes in the time period from the 26th of each month to the 5th of the subsequent month, i.e., roughly over two weeks around the turn of the month. Then I compared this return with that achieved by investing in the remaining time around the middle of the month, i.e., from the 6th to the 25th of each month.

Note: these timing parameters (5th/6th and 25th/26th) were chosen because they generated the best long term results in the US stock market. It is possible (even likely) that slightly different dates would generate better results in other countries.

The following table shows the results for the major stock market indexes of all 11 countries, detailing the average returns achieved around the turn of the month and in the mid-month period.

 

The turn-of-the-month effect in selected countries. The returns generated in the turn-of-the-month period beat the mid-month period in all countries we have examined.

 

The column designated “Diff” shows the excess return of the turn-of-the-month period over the mid-month period. As a glance at this column immediately makes clear, the gains achieved by investing in the turn-of-the-month period beat those of the mid-month period in all eleven countries, in most cases by quite a significant amount to boot.

These excess returns are achieved despite the fact that the time period during which the turn-of-the-month effect occurs is actually slightly shorter than the mid-month period it is compared against (this has implications in terms of risk-adjusted returns).

 

The “Turn-of-the-Month Effect” is Even Stronger in Overseas Markets than in the US

It is quite noteworthy that in all the other countries we reviewed, the effect was even more pronounced than in the US.

The markets of four countries actually suffered losses in the mid-month period on average. These are:

 

  • France
  • Germany
  • Korea
  • Great Britain

 

In these countries it would actually have been advantageous not to have been invested at all in the time period around the middle of the month.

As the table illustrates, the strength exhibited by the stock market around the turn of the month is a global phenomenon. This is a very simple pattern that has been known for a long time. There are a great many more seasonal patterns, which can be identified with the Seasonax app on Bloomberg and/or Thomson-Reuters. Many of these patterns are still completely unknown to the broader public.

By contrast, most market participants have been aware of the “turn-of-the-month” effect for a long time. It is interesting that it continues to work despite this fact. Apparently far too few traders have adapted to this recurring phenomenon and it seems to have attracted very little arbitrage activity. It seems the simplest rules are often the best!

 

Charts by Seasonax

 

Edited by PT, chart and image captions by PT where indicated

 

Dimitri Speck specializes in pattern recognition and trading systems development. He is the founder of Seasonax, the company which created the Seasonax app for the Bloomberg and Thomson-Reuters systems. He also publishes the website www.SeasonalCharts.com, which features selected seasonal charts for interested investors free of charge. In his book The Gold Cartel (published by Palgrave Macmillan), Dimitri provides a unique perspective on the history of gold price manipulation, government intervention in markets and the vast credit excesses of recent decades. His ground-breaking work on intraday patterns in gold prices was inter alia used by financial supervisors to gather evidence on the manipulation of the now defunct gold and silver fix method in London. His Stay-C commodities trading strategy won several awards in Europe; it was the best-performing quantitative commodities fund ever listed on a German exchange. For in-depth information on the Seasonax app click here (n.b.: subscriptions through Acting Man qualify for a special discount! Details are available on request).

 

 

 

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One Response to “The “Turn of the Month Effect” Exists in 11 of 11 Countries”

  • Hans:

    Thank you, Mr Speck. This is very valuable information
    for any option trader.

    This was certainly the case with the DOW, which started
    it’s decline January the 25th and ending February the 8th.

    In that cycle, it destroyed most of the gains in our SPY call option.

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