NYSE Margin Debt Drifts Higher

 | Sep 24, 2014 12:26PM ET

Note from dshort: The NYSE has released new data for margin debt, now available through August. I've updated the charts in this commentary to include the latest numbers.

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.

Debt hit a trough in February 2009, a month before the March market bottom. It then began another major cycle of increase. Margin debt hit an all-time high in February of this year.

The Latest Margin Data

Unfortunately, the NYSE margin debt data is about a month old when it is published. Following its February peak, real margin declined sharply for two months, -3.9% in March -3.2% in April and was flat in May. It then jumped 5.7% in June, its largest gain in 17 months. June saw a 0.9% decline, but the August number has drifted higher, up 0.6%, and is now only is 1.9% below the February peak.