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The S&P 500 is becoming uncorrelated with its own members

Jason Goepfert
2020-09-03
The S&P 500 is being driven by relatively few stocks, enough so that over the past month, it is becoming uncorrelated to its own Advance/Decline Line.

The correlation between the S&P 500 index that everyone watches and its equal-weighted cousin have broken down. The two versions of the same index are moving less together than at almost any point in the past 30 years, due to the by now well-documented dominance of the very large tech stocks, and otherwise poor breadth.

The index is even becoming uncorrelated with itself. Isabelnet notes that the correlation between the S&P 500 and its own Cumulative Advance/Decline Line is breaking down. 

This is nearing the smallest-ever correlation between the index and...itself. The only other time this happened was 1999-2000.

Correlation between S&P and advance/decline line

This kind of split in the market has also caused a drop in the correlation between value and growth stocks. Going back to 1928, the two factors have never moved quite like this. Over the past month, the two actually have a negative correlation, a stunning historical anomaly.


This is an abridged version of our recent reports and notes. For immediate access with no obligation, sign up for a 30-day free trial now.

We also looked at:

  • A look what happens when the correlation between value and growth stocks breaks down
  • Corporate insiders are buying two specific sectors, while pulling back on a third
  • More than a third of Nasdaq 100 stocks are overbought
  • Finally, less the half of S&P 500 stocks are in a correction
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