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Equal-weighting the S&P 500 vs the S&P 400

by: Lawrence Hamtil     
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Recently, S&P Dow Jones published a great article titled "Outperformance in Equal-Weight Indices," which goes into great detail about what drives the excess performance of the S&P 500 Equal-Weighted index versus its capitalization-weighted parent index.  According to S&P Dow Jones, a main driver of excess outperformance is greater exposure to big winners in equally-weighted portfolio (via SPDJ):

 

However, the utility of equal-weighting a large cap portfolio such as the S&P 500 is questioned by those who point out that the equally-weighted S&P 500 is essentially another way to have more exposure to midcaps.  To a large extent, this is true; after all, excess performance for the S&P 500 equal-weighted portfolio and the S&P 400 midcap portfolio (capitalization-weighted) have been very highly correlated (table via SPDJ):

Visually, this relationship can be seen over time by comparing excess performance for both the S&P 500 Equal-weighted index and the S&P 400 Midcap index versus the capitalization-weighted S&P 500 itself.  As can be seen in the graph below, the equal-weighted S&P 500 index outperforms when midcaps are doing well, and underperforms when megacaps are faring better:

These observations tend to confirm that, at the index level, a capitalization-weighted midcap portfolio is a good proxy for an equally-weighted large cap portfolio.  To test this a little further, we can compare them at the sector level, which also reveals a high degree of similarity between the capitalization-weighted S&P 400 Midcap sector indices and their S&P 500 equally-weighted counterparts.  However, in some cases, the results vary quite a bit:

Remarkably, the similarities are greatest in the industrial and consumer discretionary sectors.  This is surprising given the domination of these sectors by megacaps such as Boeing and Caterpillar in the industrial space, and Amazon in the consumer discretionary space.

Not surprisingly, however, is the wide gulf in performance between the two energy portfolios.  Unlike the S&P 500 equally-weighted energy portfolio, which contains around 30 well-established energy firms, the S&P 400 Midcap Energy index is composed of much smaller companies, many of which are engaged in the riskier corners of the energy space.  This dispersion between two portfolios that, in theory, should behave similarly seems to confirm what we have written previously, which is that increased exposure to the most volatile areas of an already very cyclical sector, like energy, is less likely to be beneficial as the excess performance of these particular smaller companies is mostly fleeting, since it is tied to macro variables, like the price of oil rather than intrinsic factors.   

The results in telecommunications were likely skewed by the collapse of the telecommunications bubble in the early 2000s, which destroyed the value of many mid- and small-sized telecommunications companies, leaving the value of only a handful of large companies like AT&T and Verizon somewhat intact.

In sum, well-diversified capitalization-weighted midcap portfolios can serve as decent proxies for an equally-weighted large cap portfolio, such as the S&P 500 and many of its sectors.  However, the reasons for the similar performance at the aggregate level between an equally-weighted large cap portfolio and a capitalization-weighted midcap portfolio are likely not what most investors would probably assume, and they deserve more study than they currently receive.

[Additional graphic:  Excess drawdowns for S&P 500 Equal-weight vs S&P 500 and S&P 400 Midcap vs S&P 500]



The information provided above is obtained from publicly available sources and it is believed to be reliable. However, no representation or warranty is made as to its accuracy or completeness.


Lawrence Hamtil is a fourteen-year veteran of the financial services industry, having served clients in all aspects of the business during his career, which started in 2002. In 2005, he joined Dennis Wallace of Fortune Financial Services, LLC, becoming, at the time, one of Multi-Financial Securities, Inc's youngest registered representatives. In 2008, Dennis and Lawrence made the decision to become fully independent by founding their own Registered Investment Advisory (RIA), Fortune Financial Advisors, LLC. He serves clients in the United States and Europe. His financial commentary has been referenced in Barron’s online edition.

You can connect with Lawrence on Twitter ( @lhamtil) or via email, lawrence.hamtil@fortuneadv.com. 

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