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Research by Robeco and academic researchers shows that a low-risk anomaly exists in credit markets: low-risk credit portfolios earn higher risk-adjusted returns than high-risk portfolios over a full market cycle. Robeco Conservative Credits, launched in 2012, exploits this anomaly by investing in low-risk bonds of low-risk issuers. Both the research and the live track-record show that low-risk credits realize a superior Sharpe ratio compared to the credit market index.
Conservative Credits uses a quantitative model to rank issuers in the low-risk bond universe. Our Distress Risk basket is the dominant driver of the model3 and measures company risk using balance sheet and market data. The main variable in the basket is Distance-to-Default, which is constructed in the spirit of the Merton (1974) structural credit risk model. Distance-to-Default measures a firm’s default risk using its equity market capitalization, equity volatility, and balance sheet leverage. Robeco research shows that a portfolio of low-risk companies, as identified by our Distress Risk basket, generates a similar return as the market, but with much lower volatility, resulting in a superior Sharpe ratio 4. Moreover, such portfolios generate higher Sharpe ratios than portfolios based on generic risk measures, such as credit rating.
After an extensive research project, investigating possible additions to the Distress Risk Basket, we decided to add cash flow leverage to the basket. Cash flow leverage is measured as a company’s current debt level divided by the generated cash flow over the past year. It may be interpreted as the number of years a company needs to redeem all its debt. Obviously, we prefer companies with lower leverage over companies with higher leverage. We conducted a back-test by creating quintile portfolios: the Q1 portfolio contains the 20% firms with the lowest leverage, followed by the next 20% in Q2, etcetera, until the most levered 20% in Q5. Figure 1 shows that companies with higher cash flow leverage clearly had higher volatilities. However, portfolios Q1 to Q4 earned similar returns, irrespective of their risk, while the highest-risk portfolio (Q5) even had the lowest return. This is the right behavior for the Distress Risk basket.
The cash flow leverage variable is only applicable to corporates and not to financials due to their specific accounting rules. Therefore, we also analysed various risk variables that are specific to financials. After extensive investigations, we selected the Tier-1 ratio for addition to the Distress Risk basket. The Tier-1 ratio is defined as the ratio of the core equity capital to the risk-weighted assets. We prefer higher Tier-1 ratios, since this means that more capital is available to cover losses on the loan portfolio of the bank. Figure 2 shows the risk and return of tertile portfolios constructed by ranking financials on this variable 5. Firms with the lowest Tier-1 ratio clearly had the highest risk, which was not compensated with a higher return. Once again, these results show a low-risk anomaly.
The quantitative results of our research project show that the new variables have the desired low-risk characteristics and that they have added value to the model. Additionally, we are happy with the increased breadth of the model and the added diversity of the information contained in the Distress Risk basket. This increases the quality and robustness of the low-risk screening in our model.
Due to this enhancement of the Distress Risk basket, we are confident that the Conservative Credits strategy will continue to generate attractive Sharpe ratios for our clients.