Correlation of UK and international stock markets

The following charts show the correlation of monthly returns between the FTSE All-Share index and six international indices for the period 2000-2014.



Correlation of FTSE All-Share Index and DAX [2014]

Correlation of FTSE All-Share Index and CAC40 [2014]


Correlation of FTSE All-Share Index and Nikkei 225 [2014]


Correlation of FTSE All-Share Index and Hang Seng [2014]


Correlation of FTSE All-Share Index and All Ordinaries [2014]


Correlation of FTSE All-Share Index and Bovespa [2014]


The first observation is that all the markets are positively correlated with the UK market.

The next question is how closely correlated are they?

The following table summarises the R2 values for the correlation between the FTSE All-Share Index and the six international indices; the equivalent values are also given for the previous year. The higher the R2 figure the closer the correlation (R-Squared is a measure of correlation – in effect, how close the points are to the line of best fit).

Index R2 R2 (2013)
CAC40 0.78 0.79
DAX 0.69 0.70
All Ordinaries 0.61 0.62
Hang Seng 0.48 0.49
Bovespa 0.45 0.47
Nikkei 225 0.37 0.39

By visual inspection it can be seen that in the charts of CAC40 and DAX the points are more closely distributed around the line of best fit. This is confirmed in the table where it can be seen these two markets have the highest R2 values with the FTSE All-Share (the CAC40 value of 0.78 is now higher than that of 0.76 for the S&P 500). The index with the lowest correlation with the UK market (in the sample) is the Nikkei.

The practical impact of this is that if a UK investor is looking to internationally diversify a portfolio they would do better by investing in markets at the bottom of the table (low R2) than at the top. And the good news for investors looking for diversification is that the correlation between the UK market and all the international markets in this study has fallen in the past year.

See also correlation between the US and US stock markets.

UK Stock Market Almanac cover [160 x 240]The above is an extract from the newly published UK Stock Market Almanac 2015.

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Sovereign rating downgrade effect on equity markets

What is the effect on equity markets when sovereign debt loses its AAA rating?

The following chart shows the effect on five equity markets when the related sovereign debt lost its triple-A rating.


  1. The date of the downgrade is taken as the first date that the sovereign lost its AAA rating. For example, Moodys downgraded Japan in November 1998 but Standard & Poor’s kept Japan at its highest rating of triple-A until February 2001. In this study the first date (November 1998) is used.
  2. The time period analysed is from two months before the downgrade to 12 months after. The downgrade is announced in week 9 – as indicated by the dotted line in the chart.
  3. The five indices are indexed to 100 at the end of week 9.


  1. In the short term (two months) following the downgrade all the equity markets except Japan performed strongly.
  2. After the first two months, Japan then rebounded strongly, although the French market then suffered a period of weakness.
  3. 12 months after the downgrade all equity markets were higher, with an average increase of 17.7% from the time of the downgrade.

The data is summarised in the following table-

Date of losing AAA Country Index Index change 12 mnths after downgrade(%)
Apr 1993 Canada S&P/TSX 18.5
Nov 1998 Japan Nikkei 225 23.5
Apr 2010 Spain IBEX 17.0
Aug 2011 US S&P 500 18.0
Jan 2012 France CAC40 11.6
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