Alpha and Excess Return: Not Synonymous

Alpha vs Excess return

Can a fund whose alpha is positive significantly underperform the market? Yes, it can.

This is a common question we receive during our clients’ Quarterly reporting, so we felt it worth addressing this phenomena – and taking a quick look at funds that gain this distinction.

There is a common misperception that alpha means outperformance or “beating the market”. Alpha, in its simplest definition, is excess returns to a beta-adjusted market benchmark.

A fund with positive alpha but negative excess-market returns typically has beta less than 1. In a directionally upward market, such as we have experienced in the past 3 years, beta lower than 1 is penalizing, and is often the driver in a fund with positive alpha that underperforms its benchmark. A fund can be a great stock picker or selector but, because the fund has low beta, its bets in underperforming sectors can cause the manager to return less than the benchmark.

In fact, looking over the past 3 years, 31 Large Blend U.S. Equity Funds (out of 652 in the category, or less than 5%)[1] have met this criteria when measured against the S&P 500, which has returned 48.64% over the period and 14.13% annually.[2] Funds from Goldman Sachs Asset Management and GMO are included in this group.

Though underperforming, once adjusted for risk, these funds’ returns are typically more attractive for the investor looking to keep a lid on volatility. In fact, average annualized standard deviation for these 31 funds is 13.5% vs. 15.7% for the S&P 500.

And when we look a little deeper at the 10 highest alpha generators that underperformed the S&P 500 (see the table below), there are a few noteworthy patterns[3]:

  • A concentration of dividend and dividend growth funds
  • There are a high number of similar top holdings amongst the group
  • The managers take a bottom-up approach
  • Active management style

When we look at investment style, however, we note that a number of these funds have significant style biases. According to the Russell-6 Index Style Map chart below, the majority of these funds behave as if they generate a considerable portion of their returns from bets outside of Large Blend U.S. Equity. This can also be seen in the portfolio breakdown of the funds’ style portfolios shown in the right-most columns in the above table.[4] For half of the funds, market factors outside of Large U.S. Equity comprise greater than 50% of the style portfolio.

Excess return positive, alpha negative, top 10

This brings us to the broader definition of alpha – as a measure of a manager’s skill. A common problem when assessing the value a manager provides is the benchmark being used. If a fund is benchmarked to the S&P 500 but has consistently low beta and style and/or market cap bias, the S&P 500 is neither the most accurate benchmark nor the most precise measure of manager’s worth.

Taking the next step in finding a more precise benchmark for a fund requires returns-based style analysis, also referred to as performance-based factor analysis. Once we perform style analysis and then find the static style benchmark – the average weighting of exposures to various factor or style indices over time – we are able to get a much more precise read of a manager’s skill, and a better understanding of how timing and selection drive performance.

We will continue this discussion – and demonstrate how to properly perform style analysis to find a custom benchmark to better measure alpha – in a later post.

 



[1] All funds with track records greater than 3 years; Morningstar categorized as Large Blend; Morningstar data used.

[2] Given that large blend funds generally match the style profile of the S&P 500, the S&P 500 is a good benchmark to view this phenomena.

[3] MPI conducts performance-based analyses and, beyond any public information, does not claim to know or insinuate what the actual strategy, positions or holdings of the funds discussed are, nor are we commenting on the quality or merits of the strategies. This analysis is purely returns-based and does not reflect actual holdings. Deviations between our analysis and the actual holdings and/or management decisions made by funds are expected and inherent in any quantitative analysis. MPI makes no warranties or guarantees as to the accuracy of this statistical analysis, nor does it take any responsibility for investment decisions made by any parties based on this analysis.

[4] Derived from style analysis using a uniform factor map, this captures the factor composition of the funds’ style portfolios (performed with mpi Stylus). With Predicted R2, MPI’s proprietary measure of predictability, averaging over 90%, there is a high degree of credibility in this analysis.

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2 Responses to “Alpha and Excess Return: Not Synonymous”

  1. After reading this I still don’t know how a fund can have positive alpha and lose money. Can you spell it out more precisely?

    • Hi Cathy,
      The beta is as important as alpha. People often forget that alpha doesn’t live in isolation. Let’s assume that Alpha=1% and market Beta=1 for a portfolio in a single-index CAPM. If the market returned -2% the portfolio loses money despite having positive alpha. When the market performance is positive, the portfolio could lose money only if beta is negative. But the focus of this piece is more about investment risk – the risk of
      underperforming the market. Again, beta is at play here. If Alpha=1%, as in the previous example, and Beta=0.8, then if the market returns more than 5%, the
      portfolio loses to the market.

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