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Alpha in investing

All about alpha

If you are somewhat active in the field of investing and trading, you may have heard of the term ‘ alpha ‘. For example, you will find it in various financial articles or in the results of a fund manager. But what exactly does it mean? You can read all about it in the article below.

What is alpha?

The term alpha comes from the Greek letter u03b1 and can best be qualified as a gauge or a standard. It is used to indicate to what extent someone has succeeded in beating the market. In other words, it indicates how someone has performed compared to the overall market. For ‘the market’ an index is often taken that serves as a reference. The lead is always linked to a time period. Instead of the term alpha, the terms ‘abnormal return’ and the English variant ‘excess return’ are also sometimes used.

The alpha can be both negative and positive. This depends on how close the achieved results are to the price of the reference index. It is important to realize that the alpha is not only relevant when measuring investment results in the private sector. Fund managers also use it. When you know what the alpha of a fund manager is, you will be able to estimate whether this fund manager uses effective strategies.

Difference between alpha and beta

You may have noticed that in addition to the term alpha, the term beta is also used. These two terms have a different meaning, but can be applied in the same context. The term alpha only says something about the profit of a portfolio . The beta, on the other hand, is used to express the volatility compared to the market. It therefore gives an image of the risk. This is why it is sometimes called the ‘systematic market risk’. For example, if you were to come across a beta of 1.5, you could conclude that the investment product (for example a share) is 50% more volatile than the entire market.

Ranking Funds

The alpha can provide relevant insights when you have to make a choice between different investment funds . With the help of the alpha, different funds can be ranked. After analyzing the results of an investment fund, an alpha will be linked to it. The alpha is often indicated with a number. This number can be read as a percentage. For example, an alpha of +2.0 usually means that a portfolio performs 2% better than the reference. An alpha of -2.0 would mean that the portfolio performs 2% worse.

Calculating the alpha

In principle, the calculation is not very difficult. The alpha is calculated by subtracting the total profit from the reference. However, an advanced investor will say that this calculation is too simplistic and takes (too) little account of other relevant factors.

The capital asset pricing model (CAPM) was developed to provide clear insights into the performance of a portfolio. The risk-free return – the so-called ‘RoR’ – occupies an essential place in the calculation. The RoR must be subtracted from the (expected) profit. Then you must subtract the beta from this. The result is the risk premium. This is multiplied by the ‘profit’ of the market (the reference). The last step is to subtract the RoR from the result.

Alpha (CAPM) = Total Portfolio Return – RoR – Beta x (Reference Earnings – RoR)

When you have calculated the alpha, you will get a number that you can read as a percentage. Is the percentage negative? Then the portfolio is underperforming the market. In a positive case, you have managed to ‘beat’ the market. You are then performing better than the market in general. Keep in mind that the alpha can change over time. It is not a fixed figure.

alpha bij beleggen

Pros and cons of using Alpha

Like many financial metrics, using alpha has its pros and cons. Here are a few of them.

Advantages

  • Calculating alpha increases the measurability of your portfolio. You can gain concrete insight into how well you are performing compared to the overall market.
  • Alpha can be used to rank mutual funds, giving you a clear picture of a fund manager’s performance.

Disadvantages

  • The alpha is only used within the stock market. Different assets can therefore not be compared with each other. With a very diverse investment portfolio, the indicator can therefore hardly be used.
  • If you use alpha as a benchmark, you assume that it is possible to beat the market. However, this contradicts a theory called the efficient market hypothesis. This theory assumes that the market is always priced correctly and that you cannot beat the market because of this.

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