“Sell in May and go away” is probably the most widely cited stock market cliché in history. Every year a barrage of Wall Street commentaries, media stories, and investor questions flood in about the popular stock market adage. We tackle this commonly cited seasonal pattern and why some seasonal weakness could make sense in 2021. (“Sell in May and go away” began in England originally as “sell in May and go away until St. Leger’s Day.” The saying was based around the St. Leger Stakes, a popular horse race in September that marked the end of summer and a return of the big traders and market volume.)

The Worst Six Months Of The Year
“Sell in May and go away” is the seasonal stock market pattern in which the six months from May through October are historically weak for stocks, with many investors believing that it’s better to avoid the market altogether by selling in May and moving to cash during the summer months.

As [Figure 1] shows, since 1950 the S&P 500 Index has gained 1.7% on average during these six months, compared with 7.1% during the November to April period. In fact, out of all six-month combinations, the May through October period has produced the weakest—and least positive—average return.

With the S&P 500 up 87% from the March 2020 lows, we do think the potential for some seasonal weakness is high and would be perfectly normal after such a run.

What Have You Done For Me Lately?
As we head into this seasonally weak period, keep a few things in mind. First, the S&P 500 has closed higher during the month of May in seven of the past eight years—so “Sell in June” might be more appropriate. In addition, stocks appear to get a boost in May of a post-election year, as the S&P 500 is up 1.7% on average these years, with only July and November stronger.

The point is that investors shouldn’t necessarily blindly sell on May 1, but rather should be aware that volatility tends to happen in the summer and fall months. As we mentioned in our April 19, 2021 issue Peak Optimism?, we do see some signs that the bar is quite high now for further upside market catalysts. Everyone knows the reopening is happening, and everyone knows the economy is roaring back. From a contrarian point of view, this high bar could be tougher to clear as we move into the seasonally weaker summer and fall months.

Here’s the catch—and there’s always a catch: These ‘worst six months of the year’ have been quite strong lately. In fact, stocks gained eight of the past 10 years during these six months, as you can see in [Figure 2]. So, although our guard is up for some potential seasonal weakness, be aware it could be short-lived, and we’d use it as a buying opportunity.

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