Sell In May? | Weekly Market Commentary | May 6, 2019


  • The May through October period has historically been the weakest six months for equities.
  • However, in recent years the six-month stretch has seen higher equity prices.
  • This year, with stocks up significantly from the December lows, we advise more caution than previous years

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“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. This week, we tackle this commonly cited seasonal pattern, and why some seasonal weakness could make sense in 2019.


“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 1.5% on average during these six months, compared with 7% during the November to April period. In fact,out of all six-month combinations, the May through October period has produced the worst average return.

Taking things a step further, we found that stocks pull back from peak to trough an average of 11.1% during these worst six months. With the S&P 500 up 25% from the December lows, we do think the potential for a correction of that magnitude is possible.


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 six consecutive years—so “Sell in June” might be more appropriate. Not to mention these “worst six months” have been higher six of the past seven years. The point is that investors shouldn’t necessarily blindly sell May 1, but rather be aware that volatility tends to happen in the summer and fall months. For instance, last year the S&P 500 closed higher in May, June, July, August, and September, and then lost 7% in October for the worst monthly drop in nearly seven years.

Also consider the four-year presidential cycle. The previous two pre-election years saw substantial pullbacks during these worst six months. In 2011, the S&P 500 lost nearly 20% after the U.S. debt downgrade in August of that year. Then in August 2015, the Dow Jones Industrial Average had its first ever 1,000-point drop on Chinese currency and economic concerns. Considering the S&P 500 is near all-time highs and up more than 25% from the December lows, more volatility could be forthcoming. Figure 2 shows what the S&P 500 has done on average the past 20 years. It is quite clear that the majority of the gains have tended to happen early and late in the year. It is the middle part of the year when things have tended to get quite choppy.


As we noted last week, new highs have tended to resolve with above-average returns in the longer term, but a pullback near term is possible. And we have to mention the list of near-term potential worries that could produce some skittishness: a disagreement with China over trade as the finish line for a deal nears (this risk surfaced over the weekend), possible U.S. tariffs on European autos, Brexit and other structural challenges in Europe, prescribed defense spending cuts, the federal debt ceiling, and a possible late-year rate hike from the Federal Reserve.

Sometimes though, it could be as simple as a big start to a year makes stocks more susceptible to a pullback. As Figure 3 shows, the previous five times the S&P 500 was up more than 14% during the first four months of a year, we saw below average returns during the usually weak May to October period. In fact, only once did stocks rise during those six months, with substantial peak-totrough pullbacks occurring three times. With the S&P 500 up 17.5% this year as May began, history has shown that substantial gains over the next six months might be tough to come by.


We’re entering the historically worst six months of the year for stocks, but that doesn’t mean investors should simply sell and buy back in after Halloween.

Potential catalysts for a sell-off are growing, and various events have sparked large corrections in recent years. It is important to note, however, that a correction is just that — a correction. We continue to think the fundamentals support continued economic growth. Case in point: On May 2, first quarter productivity rose at the fastest year-over-year pace since 2010. Higher productivity helps to offset rising labor costs, which can help mitigate inflationary pressures and support healthy profit margins for U.S. companies — thus extending this nearly 10-year-old economic cycle.

We believe there are enough potential positive catalysts to possibly push the S&P 500 through our year-end fair value target of 3,000 this year. But it won’t be a straight line. We recommend a market weight equities allocation, as a seasonal correction is quite likely over the coming months. We would be buyers on any material weakness, as long as the fundamentals remain consistent with continued economic expansion.

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