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Why You Should Pay Attention to the 39-Week Moving Average

Identifying powerful trends can lead to major outperformance in the stock market, and this frequently overlooked moving average is a favorite among some legends.

Magnifying Glass

Technical analysis is sometimes dismissed by investors because of its limited viability as a predictive tool. It makes sense. The only variables are price, volume and time. But knowing how much of something traded at what price in the past doesn’t offer insight into what will happen in the future.

Where the critic (unfortunately) throws the baby out with the proverbial bathwater is with trend following. By its very nature, trend following is not a predictive exercise. Its basic premise is the same as Newton’s First Law, an object will “stay in motion” absent a force applied to change that motion.

So an investor that has identified a promising trend can simplify their investing process while simultaneously benefitting from the sometimes-explosive moves of growth stocks.

Historically, trends in the stock market tend to persist. Unlike cyclical assets like commodities and cryptocurrencies, stock trends can last for months or even years, making them ideally suited for investors who embrace a trend-following approach.

One of the best tools for following stock market trends is the 39-week moving average (MA). This particular tool was one of the favorite trend lines of Cabot’s late founder, Carlton Lutts, as well as legendary mutual fund trader and newsletter writer Dick Fabian. The 39-week line closely corresponds to the popular 200-day MA used by many traders today, but the former typically provides slightly more reliable signals when using a weekly timeframe.

Describing the utility of the 39-week MA for trend investing, Lutts wrote:

“Using the trend principle, we can never be on the wrong side of the market’s long-term trend for very long. And once the new trend forces us onto the correct side of the market, the probabilities favor a continuation of the new market trend.”

Fabian, meanwhile, beat the market for many decades using the 39-week MA for timing mutual funds and the stock market. His system has proven to be consistently reliable for confirming when the broad market has established a major bottom going all the way back to 1929.

Fabian’s rule for fund timing is simple: He advocated buying an actively traded fund on a weekly close above a 39-week trend line (this rule also applies to ETFs). Additionally, his rule states that either the Dow Industrials or Dow Utilities should have also closed above their 39-week MA. His technique further advises selling when the fund’s weekly close is below the 39-week MA, and either the Industrials or Utilities have also closed under their 39-week lines.

For broad market timing, Fabian advised buying stocks whenever the Dow Industrials closes 2 percent above the lowest point of the market decline, the Dow Transports are 4 percent above the lowest point of the decline, and the Dow Utilities are 8 percent above the lowest point of the decline.

With that in mind, let’s evaluate the current market environment. According to the above-mentioned method, the stock market has registered a bottom since all three Dow averages are well above their yearly lows by the required percentages. Moreover, the Dow Industrial Average is above the 39-week MA as of mid-December.

INDU Chart

Now let’s take a more specific look at an actively traded sector fund that has just recently closed above the 39-week trend line, signifying a bullish trend reversal. Basic materials stocks are a key outperformer in this category, as the chart of the Materials Select Sector SPDR ETF (XLB) attests.

XLB Chart

While strength in the somber materials sector may not always be the best sign for the broader market, it has tended to be a good sign of long-term momentum for the sectors itself. As market statistician Jason Goepfert of SentimenTrader recently commented, “[Materials stocks] have rarely, if ever, declined in the 6-12 months following a resurgence of interest like they’ve enjoyed over the past couple of months.”

Materials sector stocks are just one way of taking advantage of the Lutts/Fabian trend-following approach involving the 39-week trend line. As the broad market recovery (presumably) expands, it will be important for trend-following investors to watch other major sectors for improving strength and profit opportunities. Using this reliable trend-tracking tool is an extremely useful—and easy—way to do this.

To learn more about technical analysis of stocks, download this free report. Or, if you’d rather trade alongside an expert momentum trader, consider a subscription to Cabot Top Ten Trader today!

For over 20 years, he has worked as a writer, analyst and editor of several market-oriented advisory services and has written several books on technical trading in the stock market, including “Channel Buster: How to Trade the Most Profitable Chart Pattern” and “The Stock Market Cycles.”