At this point it is not a little known fact that historically the month of September has by far been the worst performing month for the stock market. Figure 1 displays the grim tale quite clearly. This chart displays the cumulative gain or loss registered by the Dow Jones Industrials Average during each calendar month starting in January 1955.
Figure 1 – Cumulative % Gain for each calendar month (January 1955-Present)
As you can see, while May, June and August also registered net losses (of -12.3%, -14.8% and -8.6%, respectively), the Dow has lost a cumulative -50.6% during the month of September. So the obvious question is “should we sell now and buy back on September 30th?” Well, not necessarily.
For the record, the month of September has seen the Dow register a gain in 5 of the last 7 years. Figure 2 displays the cumulative decline of $1,000 that was invested in the Dow only during the month of September since 1955.
Figure 2 – Cumulative Dow % Loss during September (1955-Present)
While the overall results are pretty darn dismal, the key thing to note is that it is not like the Dow is guaranteed to decline during the month of September each and every year.
September – Labor Day Period versus Rest of Month
A closer look reveals that if something good is going to happen in the stock market during September, it is far more likely to happen before mid-month. The early part of September revolves around Labor Day and as I wrote about in my book “Seasonal Stock Market Trends”, the stock market has showed a strong tendency to perform well during the three days before and the three days after market holidays.
Figure 3 displays the growth of $1,000 invested in the Dow during all pre and post Labor Day trading days that fall in the month of September (blue line) versus all other September trading days (red line).
Figure 3 – September Trading days that are within 3 trading days of Labor Day (blue line) versus all other September trading days (red line)
-The “holiday” trading days witnessed a meager cumulative gain of +10.5%.
-All other September trading days registered a cumulative loss of -55.3%,
September – A Tale of Two Time Frames
With the obvious caveat that there is no guarantee that history will hold true this time around, the fact is that the latter part of September can be a pretty brutal affair. Figure 4 displays the cumulative loss for the Dow during Trading Days #1 through 14 during September (blue line) versus Trading Days 15 through 21. As you can see, the red line has had very few big “ups” and a whole lot of “downs”.
Figure 4 – Growth of $1,000 invested in Dow during September Trading Days #1-14 (blue line) and September Trading Days 15-21 (red line)
-September Trading Days #1 through 14 have registered a cumulative loss of -17.7%.
-September Trading Days #15 through 21 have registered a cumulative loss of -40.1%.
So back to our original question – “should we sell everything now and come back at the end of September?” Well, the truth is that there is no way to know what will happen during the month of September this time around. But history strongly suggests that a bit of caution may be in order. Some choices to consider include:
-Selling some stock positions and moving the proceeds to cash.
-Selling covered calls to generate some income in case your stocks move sideways to lower.
-Buy an inverse stock index fund (to make some money if the stock market declines).
-Do nothing and hope for the best.
Hey, have a nice month!
Staff Writer and Trading Strategist
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