Risk Indicators - Market Breadth
The S&P 500 has retraced some of the gains from last week today, but volatility is still relatively low. On the surface, this seems encouraging. However, if we want to evaluate how strong the rally has been, an interesting study is to compare the S&P 500, which is weighted based on market capitalization, versus the S&P 500 on an equal weight index.
Right now, the S&P 500 has the most exposure to the largest companies (the winners) and the least exposure to the smallest companies (often the losers or riskier stocks) so if the biggest companies are doing very well, then the index will rise even if the smaller companies are doing poorly. This can happen when investors are rushing into stocks that are using cash reserves to conduct buybacks or are using larger firms as a defensive strategy against market volatility.
An equal weight index measures the average performance of the S&P 500 as if each stock, no matter how large, is 0.20% of the index. If the equal weight index is underperforming the regular index, then we can assume that market breadth is weak.
The last few times the S&P 500 got to a new high while the equal weight index showed weakness was January 2018, September 2018, April 2019, and July 2019. This means fewer stocks are driving the rally which makes short-term reversals more likely. As you can see in the following chart, this round of weakening breadth has existed since late February, so investors should be a little concerned.
Don’t mistake information like this for a “sell signal” instead it’s like reading the weather forecast. If there is a rising chance of precipitation, take an umbrella when you leave for the office, but don’t quit your job. In my opinion, that means traders looking at a hedge against sudden volatility once earnings start to stream in this month will likely be glad they did.
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