In 6 of 10 Countries a Single Day Outperforms the Entire Week!

In the Seasonal Insights issue of 13 February 2019 I presented a study illustrating the power of intraweek effects. The article was entitled “S&P 500 Index: A Single Day Beats the Entire Week!” The result of the study: if one had been invested exclusively during a single day of the week since 2000  – namely on Tuesday – one would have outperformed a buy and hold strategy, beating the broad market.

Moreover, one would have achieved opportunity gains, as it would have been possible to invest in other profitable assets over the remaining 80% of the time.

But what is the situation on the global level? Perhaps there are intraweek profit opportunities in international markets as well.


Putting the 10 Largest Countries to the Intraweek Test

Today I want to examine whether intraweek effects can be detected in the stock markets of other countries as well, and what they actually look like.

For this purpose I have used the benchmark stock indexes of the ten largest countries in terms of market capitalization from the year 2000 onward.

The charts below show the average weekly patterns of the stock markets of all ten countries. The annualized performance of the stock markets of the respective countries since the turn of the millennium is depicted in black and that of individual days of the week in blue.

Daily changes are measured from close to close; thus the performance of e.g. Tuesday is the average return delivered from the close of trading on Monday until Tuesday’s close.


Canada: performance by days of the week, 2000 until 2/2019


Only two days of the week delivered a significant positive return


France: performance by days of the week, 2000 until 2/2019


Three days of the week outperform the overall market by themselves!


Germany: performance by days of the week, 2000 until 2/2019


All days of the week except Wednesday exhibit a positive performance.


Hong Kong: performance by days of the week, 2000 until 2/2019


Friday alone outdistances the average gain of the entire “buy and hold” period.


India: performance by days of the week, 2000 until 2/2019


India is the only country in which all weekdays exhibit a positive return


Japan: performance by days of the week, 2000 until 2/2019


Tuesday is an absolutely terrible day in Japan


Korea: performance by days of the week, 2000 until 2/2019


In nearby Korea, Monday stands out negatively


Taiwan: performance by days of the week, 2000 until 2/2019


Monday in Taiwan is the weakest individual weekday of the entire review


UK: performance by days of the week, 2000 until 2/2019


UK: Buying at the close on Wednesday and selling at the close on Friday every week would have beaten the return of the overall market by miles.

US: performance by days of the week, 2000 until 2/2019


Friday is on average the weakest day by a significant margin, while Tuesday handily beats the rest of the week.


As you can see, investors would have been able to boost their gains in all countries – partly quite substantially (with the exception of India) –  if they had been invested on certain specific, but not on all days of the week.


In These Countries One Day Outperforms the Whole Week

However, it can also be seen that in six of the ten largest stock markets there is at least one day which beats the return of the week as a whole.

Interestingly, these are often different days. In the following countries one or more days outperform the entire week:


France                – Thursday

Hong Kong         – Friday

Japan                 – Monday, Wednesday

Taiwan                – Wednesday, Thursday, Friday

UK                     – Tuesday, Thursday, Friday

US                     – Tuesday


In these six countries an investor could have beaten the market benchmark by means of simply being invested during a single day of the week.

Moreover, as the overview indicates, it’s not always the same weekday that stands out. In fact, every day of the week from Monday to Friday actually appears on the list.

Interestingly, global intraweek effects are therefore relatively independent of each other, despite the fact that these stock markets generally exhibit a strong positive correlation.

Apart from intraweek effects there are many more effects based on the calendar, such as e.g. annual seasonality, which one can analyze quickly at

Regardless of whether you are a day trader or a long-term investor, useful effects exist in all sorts of different timeframes.

PS: even individual days of the week provide profitable trading opportunities!


Charts by: Seasonax


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 , 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 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.

You can find an introduction to the Seasonax app and in-depth information on what it can do here. Furthermore, here is a complementary page on the web-based Seasonax app, which costs less and offers slightly different functionality (note: subscriptions through Acting Man qualify for special discounts – for both the Bloomberg/Reuters and the web-based versions of the app. Details are available on request – simply write a note to  with the header Seasonax!).




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