“Markets sometimes form patterns, which work until they don’t.” – Oppenheimer

Since the market is back to all-time highs, we’ve gotten a few questions about the old investment adage, “Sell in May and Go Away.” This saying comes from the belief that the stock market generates most of its gains between November and April, and that it goes no-where or declines from May to October. The origin comes from the custom of English merchants and bankers who left London for the summer and then returned in the fall. On Wall Street, traders and portfolio managers historically took long vacations between Memorial Day and Labor Day.

To follow the adage, an investor would sell all their stocks on May 1st, sit on the sidelines or invest in bonds for six-months, and then reinvest in the stock market on November 1st. Let’s call this strategy what it really is – systematic market timing. Market timing is one of our favorite topics and is something we get asked about quite often. We discussed market timing in our January Client Question. The “Sell in May and Go Away” maxim removes the most difficult market timing decisions, when to sell out and when to buy back in. Here the decision is made for you: sell in May and buy in November.

To examine how the May to October period historically performed against the November to April time-frame, we looked at historical data of the S&P 500 going back to 1929. Over the historical time period, the November to April period did outperform May to October, suggesting that the “Sell in May and Go Away” adage has some validity.

Source: Bloomberg (2019)

Before we go and sell all our equity holdings because the calendar turned to May, we will point out three critically important items:

Does not work every year:
The “Sell and May and Go Away” strategy does not work every year. Starting at the beginning of the year, the May to October period outperformed the subsequent November to April time-frame in 38 of 91 total periods (about 42% of the time). The strategy has also not worked very well recently as May to October has had better performance in 4 of the past 7 years.

Potential Capital Gains:
An investor with a taxable account could face substantial capital gains by liquidating their equity holdings each May. Taxable investors must pay capital gains taxes on realized gains occurred in the current tax year.

Opportunity Cost:
Although November to April has historically been a stronger period, the May to October time-frame still produced positive returns on average. Given that the May to October period has generated an average return of +3.88%, the opportunity cost of selling in May and not participating in future market gains is massive. From 1928 to 2018, a Buy-and-Hold approach invested in the S&P 500 would have dramatically outperformed a “Sell in May and Go Away” strategy (selling every May, going to T-bills, and buying again in November). Over the stated time period, $1,000 invested in the Buy-and-Hold strategy would have returned $4,572,000 vs. $1,213,000 for “Sell in May and Go Away”. The vast difference in performance is due to the power of compounding.


Based on our analysis, “Sell in May and Go Away” has some validity, but we believe that just like similar market timing strategies it should not considered as a serious investment approach. Most market timing strategies suffer from short-term thinking, potentially expose investors to substantial capital gains, and do not work consistently. As we’ve stated in the past, if an investor discovered the magic formula to market timing, they would essentially be able to make an unlimited amount of money. There is no magic formula. At Winthrop Wealth Management, we are long-term investors and we do not believe in market timing. Rather, we believe the best approach is to combine a detailed financial plan with a structured, consistent, and repeatable investment process.

We consistently encourage our clients to maintain a long-term viewpoint while remaining focused on their overall goals and objectives. At Winthrop Wealth Management, financial planning works in concert with investment management. The Financial Plan, which helps clients define cash flow needs and future objectives, drives the investment management strategy. The investment management process is designed to provide well-diversified portfolios constructed with a methodology based on prudent risk management, asset allocation, and security selection. As always, please contact us if you have any updates to your personal or financial circumstances.


The economic forecasts set forth in this material may not develop as predicted and there can be no guarantee that strategies promoted will be successful.
Content in this material is for general information only and not intended to provide specific advice or recommendations for any individual.

International investing involves special risks such as currency fluctuation and political instability and may not be suitable for all investors. These risks are often heightened for investments in emerging markets.

The fast price swings in commodities and currencies will result in significant volatility in an investor’s holdings.

All indexes mentioned are unmanaged indexes which cannot be invested into directly. Unmanaged index returns do not reflect fees, expenses, or sales charges. Index performance is not indicative of the performance of any investment. Past performance is no guarantee of future results.

The Standard & Poor’s 500 Index is a capitalization weighted index of 500 stocks designed to measure performance of the broad domestic economy through changes in the aggregate market value of 500 stocks representing all major industries.

The S&P Midcap 400 Stock Index is an unmanaged index generally representative of the market for the stocks of mid-sized US companies.

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The MSCI Europe Index captures large and mid cap representation across 15 Developed Markets (DM) countries in Europe*. With 445 constituents, the index coversA approximately 85% of the free float-adjusted market capitalization across the European Developed Markets equity universe.

The MSCI Japan Index is designed to measure the performance of the large and mid cap segments of the Japanese market. With 322 constituents, the index covers approximately 85% of the free float-adjusted market capitalization in Japan.

The MSCI EM (Emerging Markets) Index is a free float-adjusted market capitalization weighted index that is designed to measure the equity market performance of the emerging market countries of the Americas, Europe, the Middle East, Africa and Asia. The MSCI EM Index consists of the following emerging market country indices: Brazil, Chile, Colombia, Mexico, Peru, Czech Republic, Egypt, Greece, Hungary, Poland, Qatar, Russia, South Africa. Turkey, United Arab Emirates, China, India, Indonesia, Korea, Malaysia, Philippines, Taiwan, and Thailand.

The Dow Jones Industrial Average is comprised of 30 stocks that are major factors in their industries and widely held by individuals and institutional investors.

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