Falling Correlations in the Stock Market
In 2008-09, the sell-off in stocks was deep. Nearly every company in every industry was
hit hard – regardless of credit quality or fundamentals. Coming out of 2009, stocks continued to trade
very much in lockstep with one another. Companies
with very different fundamental values were trading up or down by very similar
amounts. In other words – the market was
not rewarding strong companies more than weaker ones.
Over the past 5 years, that trend has steadily been
reversing. The CBOE Implied Correlation
Index measures the average correlation of stocks that comprise the S&P 500
against the S&P 500 Index itself. The
Implied Correlation Index has been on a year-over-year decline since 2008-09. The trend has continued this year, as
correlations have trended downward from year-end 2012 highs above 70 to current
levels in the low 50’s (see chart below).
S&P 500 Implied Correlation Index Historical Data (CBOE.com) |
Stocks are no longer moving together quite as tightly as
they have over the last 5 years.