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It’s been a strong year for investors so far; but could a ‘Santa Rally’ provide a final boost?

What exactly is the ‘Santa Rally’? And will December’s reputation for recurring positive returns precede it?

Published on 06 Dec 20215 minute read

Written by Jason Hollands

Despite stock market wobbles surrounding concerns over the Omicron variant of Covid-19, 2021 has shaped up to be a year of strong returns for stock market investors. Since the start of the year, global equities have returned an impressive 21.4% (1).

What is the ‘Santa Rally’?

As 2021 draws to a close, some investors will be hoping that the year has even more to give yet, with the potential for December to offer up a financial Christmas present. That’s because of December’s reputation as a strong month for stock markets - a phenomenon dubbed as the ‘Santa Rally’.

Myth busting: is December a consistently strong month for stock markets?

We have put this theory to the test, analysing 40 years of data for monthly returns on global stock markets and also the UK (using the MSCI World Index and MSCI United Kingdom Index).

Far from being a myth, we found compelling evidence to support the idea of a ‘Santa Rally’. Looking at 40 years of monthly market data, December has the highest incidence of any month in providing investors with positive returns both globally and in the UK. Global equities have delivered positive returns 80% of the time in the month of December over this period, far higher than any other month.

(Source: Bestinvest / Lipper Investment Management. Data from January 1982 – October 2021. MSCI World Index, Total Return in Sterling, dividends reinvested.)

And when it comes to the UK stock market, this success rate is even more pronounced, with December delivering positive returns 83% of the time.

(Source: Bestinvest / Lipper Investment Management. Data from January 1982 – October 2021. MSCI United Kingdom Index, Total Return in Sterling, dividends reinvested.)

When it comes to the average returns generated by the month of December, our analysis also revealed an encouraging end of year pattern. Global equities have delivered an average capital return of 1.68% in the month of December over the last forty years, rising to 1.85% when reinvested dividends are also taken into account.

(Source: Bestinvest / Lipper Investment Management. Data from January 1982 – October 2021. MSCI World Index, returns in Sterling.)

This marks December out as having the highest average returns of any month, followed by November and January. December has also provided the highest average capital returns in the UK market: 2.18% rising to 2.37% once dividends are included.

(Source: Bestinvest / Lipper Investment Management. Data from January 1982 – October 2021. MSCI United Kingdom Index, returns in Sterling.)

In contrast, our analysis has identified September as the most dangerous month on average for stock markets, both globally and in the UK, with average returns that are negative. 

What’s the theory behind the ‘Santa Rally’?

There are various theories about seasonal trends in stock markets including the theory that investors should ‘sell in May’ and return after the summer, but it does seem that the ‘Santa Rally’ really is one of the most convincing. Explanations as to why stock markets tend to do well in December include the markets getting a boost as professional fund managers position for the year ahead, investing any spare cash in their funds to ‘window dress’ their portfolios ahead of reporting periods. Another is that hedge funds who take negative bets on companies – known as ‘short positions’ - close out some of these positions before the year end, which requires them to buy shares that they have previously sold. Of course, it could just be a case of seasonal cheer and the magic of the festive season!

It is important to be aware that while December is often a strong month for the markets, there is no guarantee this will be repeated this year with jitters about the new Omicron Covid-19 variant and inflation a continuing concern. It’s easy to be swayed by short-term market movements and news but the most important thing for investors is to focus on is their longer-term goals. Whether markets go up, down or move sideways in the short term, over longer-term time periods equities have consistently beaten cash returns (2).

With meagre returns on cash savings and very low yields on bonds, it is unsurprising that equities are looked upon favourably in the current environment. In particular, the UK stock market is relatively cheap compared to other major markets at the moment, which is why there are so many bids taking place for UK companies by overseas investors who can spot a bargain.

Inspired to invest? See how Bestinvest can help

At Bestinvest you’ll find everything you need to choose and manage your own investments:


(1) Lipper Investment Management: MSCI World Index Total Return GBP from 30/12/20 to 26/11/21.

(2) Barclays Equity Gilt Study.

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