In the second article of the Indices insights series, we shed more light on the shortcomings of ESG ratings. We find that investee companies in popular thematic impact strategies often have low to mediocre ESG ratings. By contrast, we observe that the same firms perform better when assessed in terms of Robeco SDG scores.
In practice, sustainable investing is often associated with mitigating exposure to ESG risks. However, we see that our clients are increasingly shifting their focus towards impact investing. This approach enables them to avoid controversial firms that have a negative impact on the environment and society, while allocating capital to those that offer positive solutions to promoting sustainable economic growth, advancing social inclusion and safeguarding the environment. As ESG ratings are still the dominant metric used in sustainable investing, we assessed if they provide investors suitable guidance to align with positive impact, or whether there is a better alternative.
In the first ‘Indices insights’ article,1 we scrutinized the sustainability ratings of companies that are explicitly earmarked by large institutional asset owners as being harmful for society. In our analysis, we found a weak relationship between the firms that are on exclusion lists and their respective ESG ratings. On the other hand, the same precluded stocks tended to have negative Robeco SDG scores. We therefore concluded that the latter metric is more useful to investors who are focused on aligning their portfolios with positive
We have since extended our investigation to popular third-party thematic impact strategies. These are typically designed to offer investors diversified exposure to companies that are associated with positive contributions to a specific theme, such as clean energy, sustainable water or health. As such, we believe they offer us another avenue to test whether readily available ESG ratings can capture the societal impact of their underlying investments.
In our evaluation, we observed a weak relationship between the investee companies in these thematic impact strategies and their respective ESG ratings, in line with the findings outlined in our first article. And similar to the outcome in our previous assessment, we saw that there was a much stronger alignment when we used a measure based on the SDGs.
For example, Figure 1 shows that about 25% of the investee companies in our sample of popular third-party thematic impact strategies with a focus on clean energy are considered to have high ESG risk, according to Sustainalytics, while an additional 50% of the holdings receive only a neutral ESG risk rating. While the picture improves when using MSCI ESG ratings, most stocks still only have an average ESG score (BB, BBB or A) or are considered to be ESG laggards (CCC and B).
By contrast, the majority of the underlying investments (more than 80%) exhibit a positive Robeco SDG score, in line with their positive impact on clean energy. A similar trend is also visible across the other themes when we look at our sample of popular third-party thematic impact strategies with a focus on sustainable water and health.
For our analysis, we took into account the holdings in some of the largest and most popular thematic impact strategies. We focused on three well-established themes – clean energy, sustainable water and health – in the sustainable investing space that consist of strategies or ETFs with considerable track records and asset bases.
More specifically, we selected thematic impact strategies with good or excellent Morningstar sustainability ratings, i.e., ones with a score of 3, 4 or 5 using their 5-point rating scale. We then added strategies with similar investment focus areas that did not have a Morningstar sustainability rating. From this group, we only chose those that had significant assets under management (USD 350 million or higher) and a minimum four-year track record.
In total, we analyzed the holdings of 14 different strategies/ETFs, amounting to 598 unique companies. Table 1 provides an overview of these strategies/ETFs.
For each of the stocks held in these impact strategies, we analyzed their sustainability scores by referring to three data providers, namely the Robeco SDG scores based on our proprietary SDG framework, MSCI ESG ratings, and Sustainalytics ESG risk ratings. Note that these three data providers use different approaches for their scoring methodologies and that their sustainability scores are not directly comparable.
That said, the sustainability scores clearly differentiate between firms that have a negative, neutral or positive impact on society (Robeco SDG scores); companies that are deemed to be ESG laggards, average in terms of ESG, or ESG leaders (MSCI ESG rating); or businesses that have high, neutral or low ESG risks (Sustainalytics ESG risk rating).
For instance, the Robeco SDG scores and MSCI ESG ratings apply a categorical scale, ranging from -3 to +3, and from CCC to AAA respectively. The Sustainalytics ESG risk ratings assign a quantitative risk score that is used to place a company in one of five risk categories, ranging from severe to negligible. This is summarized in Table 2.
This analysis further reinforces our view that ESG ratings may not effectively capture the impact companies have on society. In our opinion, an SDG-based approach can enable investors to align their portfolios with positive impact by investing in firms that contribute positively to the SDGs and avoiding those that contribute negatively.
In the next ‘Indices insights’ article, we will look at how incorporating sustainability within the investment process of a passive strategy potentially affects its risk-return dynamics. In our investigation, we will focus specifically on carbon footprint reduction and SDG integration.
In defining sustainability, investors have a multitude of dimensions and metrics they could consider. For example:
ESG scores typically put more focus on the operations of a business, whereas SDG scores also incorporate the impact that the business' products and/or services have on society.
We see client sustainability objectives increasingly moving towards avoiding controversial businesses (values-based exclusions) and including those that provide sustainable solutions (impact investing). In the first few articles of our Indices Insights series, we will empirically show how the different sustainability metrics (negative screening/exclusions, ESG, SDG) relate to the increasingly impact-oriented client sustainability objectives.
1 Huij, J., Lansdorp, S., and Van Zanten, J., February 2022, “Indices insights: Do ESG ratings align with the values of large investors?”, Robeco article.
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