NYSE Margin Debt Hits Another All-Time High

 | Mar 03, 2014 02:25AM ET

The New York Stock Exchange publishes end-of-month data for margin debt on the NYXdata website , where we can also find historical data back to 1959. Let's examine the numbers and study the relationship between margin debt and the market, using the S&P 500 as the surrogate for the latter.

The first chart shows the two series in real terms — adjusted for inflation to today's dollar using the Consumer Price Index as the deflator. I picked 1995 as an arbitrary start date. We were well into the Boomer Bull Market that began in 1982 and approaching the start of the Tech Bubble that shaped investor sentiment during the second half of the decade. The astonishing surge in leverage in late 1999 peaked in March 2000, the same month that the S&P 500 hit its all-time daily high, although the highest monthly close for that year was five months later in August. A similar surge began in 2006, peaking in July 2007, three months before the market peak.

The latest data puts margin debt as at an all-time high, not only in nominal terms but also in real (inflation-adjusted) dollars.


As I pointed out above, the NYSE margin debt data is a several weeks old when it is published. Thus, even though it may in theory be a leading indicator, a major shift in margin debt isn't immediately evident. Nevertheless, we see that the troughs in the monthly net credit balance preceded peaks in the monthly S&P 500 closes by six months in 2000 and four months in 2007. The most recent S&P 500 correction greater than 10% was the 19.39% selloff in 2011 from April 29th to October 3rd. Investor Credit hit a negative extreme in March 2011.

There are too few peak/trough episodes in in this overlay series to take the latest credit-balance trough as a definitive warning for U.S. equities. But we'll want to keep an eye on this metric in the months ahead.

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