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Cap Weighted Versus Fundamental Index Funds


The equity index funds that I invest in and recommend are comprised of a “basket of stocks” that are purchased all at once in the fund.

These funds carry a proportionally larger amount of stocks of companies that have the highest market capitalization, or total value. The smaller companies in the index make up a tiny fraction.

For example, the S&P 500 holds 500 publicly traded large-cap stocks. As of June, 2019, the largest 5 companies, while representing only 1% of the total number of companies in the index, actually make up 30% of the fund. If you own the fund, nearly a third of the fluctuation in the funds value is predicated on the movement of those five huge stocks.

Some have hypothesized that weighting each company equally can lead to better returns. Could that be the case? Dr. James Dahle compares and contrasts the two.

This post was originally published on The White Coat Investor

Cap Weighted Versus Fundamental Index Funds


It has been more than 40 years since the institution of “Bogle’s Folly,” the original Vanguard 500 index fund for retail investors. The results speak for themselves as index funds have repeatedly and continuously outperformed the vast majority of the actively managed mutual funds in their asset class over the long term.

The obvious truth behind Bogle’s Cost Matters Hypothesis, along with the significantly better overall performance, has convinced both professional and personal investors of the merits of this passive investing approach.

However, since 2004 there have been a growing number of “fundamental index funds” seeking to capitalize on the popularity of more traditional index funds.


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Capitalization-Weighted Index Fund


To understand the idea behind a “fundamental index fund” you have to look under the hood to understand how a traditional index fund is designed. Traditional stock indices, and the funds that track them are composed of stocks in a “capitalization-weighted” manner.

That means that if the value of Apple makes up 2% of the value of the stock market as a whole, then 2% of the value of the stock index, along with 2% of the money in the index fund following that index, will come from the performance of Apple.

The main benefits of this approach are that it is very easy to run this type of fund, it is very inexpensive to do so, and you can essentially guarantee that investors will achieve the same return as the market they are investing in. If the stock market goes up 10%, so does the value of the investment.


Fundamental Index


A proponent of a fundamental index, however, would argue that there is a better way than market capitalization to decide how much money to invest in each stock in a fund.

For example, one method has been to invest the same amount of money into each company, so that an investor has the same amount of money invested in each company.

This would mean investing equal amounts in Apple or Microsoft, currently the largest US companies with a market cap of just over $1 Trillion, Telephone and Data Systems, Inc., the 1,000th largest company in the US (worth $3 billion), and one of the smallest in Information Services Group, Inc. (worth $110 million).

Although it might not seem smart to invest the same amount of money into two companies, one of which is 5,000 times larger than the other, the results of doing that seem promising, at least when viewed through the rearview mirror of back-tested data.

Although market capitalization could be considered a “fundamental,” for the most part these strategies involve deciding how much to invest in each stock based on book value, dividends, sales, or earnings.

This avoids some of the flaws of an “equal-weighted” approach while still avoiding the “bubble problem” of a capitalization-weighted index.

That is to say, the more overvalued a stock becomes, the more of it a capitalization-weighted index automatically owns. Proponents of a fundamental index approach claim long-term benefits (using back-tested data) of as much as 2% per year over a capitalization-weighted index fund.


The Back-Tested Data


While the back-tested data tells a compelling story, I find it far more interesting to see how fundamental index funds have done going forward. There isn’t a lot of long-term data, unfortunately, as none of these funds have been around for more than 10 years.

One of the more well-known fundamental index funds with a fairly long track record, is the PowerShares FTSE RAFI US 1000 ETF (PRF), which follows an index which contains the 1,000 largest stocks in the US weighted on multiple fundamental factors including book value, cash flow, sales, and dividends.

PRF can be reasonably compared to a cap-weighted index fund such as Vanguard’s Large Cap Index Fund (VLCAX) which tracks the 750 largest stocks in the US based on market capitalization.

Over the last five years, VLCAX has outperformed PRF by 11.12% to 8.80% per year. Over the last 10 years, PRF outperformed by 13.05% to 11.86%. per year. Rather disappointing if you were expecting to outperform by 2% a year, although 10 years is not necessarily the long term.


Fundamental Index Fund
image courtesy of Yahoo! Finance

Just a Small/Value Tilt?


Critics of fundamental indexing claim that what it really does is provide a small/value tilt. According to research done by Fama and French, the returns of a large basket of stocks can be explained primarily by the size of the companies and by how “valuey” they are.

Just like for large stocks, there are cap-weighted indexes of small stocks and value stocks. When you check the data, you can see that small and value stocks outperformed larger and growthier stocks over long timeframes, so you would expect the fundamental index fund to outperform.

Likewise, over the last five years, larger stocks and growthier stocks have outperformed their counterparts. Detailed studies of whether fundamental indexing shows any advantage over simply “tilting” your portfolio toward small and value stocks show no statistical significance.


Active Management in Disguise?


In many ways, fundamental indexing is little different from an actively managed mutual fund. Many active managers pick stocks based on fundamentals. In fact, many “quantitative” fund companies have been using computer models to pick stocks for decades, just like a fundamental index fund does.

The long-term data on active management, whether a person picks the stocks or a computer does, is quite clear. Very few mutual funds outperform their respective capitalization-weighted index over the long term, especially when adjusted for the Fama/French factors of small and value, and it is impossible to pick them in advance.

Critics say that even if you call it “fundamental indexing” or its newer term, “smart beta,” it is really just active management in disguise.


Costs Matter


Finally, studies have shown that the best predictor of future mutual fund returns is cost, not past performance. Fundamental indexing simply costs more than capitalization-weighted indexing.

The funds are not as large, and thus do not benefit as much from economies of scale. Rather than rebalancing automatically as a cap-weighted index does, a fundamental index must be rebalanced from time to time, incurring additional transaction (and tax) costs.

In addition, there is no mutually-owned mutual fund company (such as Vanguard) offering a fundamental index fund, adding the cost of corporate profit to the mix. Thus, it is no surprise that the expense ratio of even a popular and relatively low-cost fundamental index fund such as PRF is 8 times higher than a total stock market index fund at Vanguard. You cannot predict future performance, but is very easy to predict future costs.

In conclusion, while there are far worse ways to actively manage a mutual fund, fundamental index funds do not appear to be the revolution its proponents would have you believe they are.

You can get the same performance at lower cost simply by tilting a portfolio toward small and value using a cap-weighted total stock market index fund and a cap-weighted small value index fund.



Do you invest in fundamental index funds? Why or why not? Do you think it’s worth paying extra to avoid some of the issues with cap-weighted index funds? Comment below!

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4 thoughts on “Cap Weighted Versus Fundamental Index Funds”

  1. Pingback: How to Teach Teens About Investing - DrDons 'Selected News You Can Use' Media
  2. Subscribe to get more great content like this, an awesome spreadsheet, and more!
  3. People are always looking for ways to beat the market. I’m guilty of that quest too. In reality, few people or systems do. At least for any length of time. Especially after costs and taxes are included. Any systems that do work become known and then the value decreases.

    Most doctors (with limited time, interest, and financial knowledge) would be best to just buy the total market index and be done with it. Thank you Jack Bogle!

  4. There are a lot of smart sounding ways to pick stocks.
    I think you would diversify better if you balance the stocks by state of origin.
    Or by first letter of the ticker name. You would have done well if you weight towards A.

    Seriously though if your core holdings are in a diversified cap weighted low cost index you can do whatever you want with the last 10% and likely do fine.

  5. I never saw the difference between the fundamental weighted index and value tilt. If It’s really wanted to tilt, I’d probably just go with DFA funds or add a low cost small value fund to my existing portfolio.

    -Psy-FI MD


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