Strategy primer: sustainable improvers

Strategy primer: sustainable improvers

Quintet’s sustainable investing philosophy comprises a toolkit of approaches and dedicated assets. In this primer we deep dive into the improvers approach – arguably the most innovative sustainable investing strategy.
What you need to know  

Section 1: What are improvers?

Improver strategies seek to identify entities that are demonstrating positive momentum in addressing their environmental, social, governance (ESG) risks and opportunities. 
What is the investment thesis?

Investors using improver strategies expect improved ESG performance to correlate to, or cause, improved operational performance. By identifying momentum ahead of other investors, they believe investee entities will deliver improved cash flows and may re-rate to a higher equity multiple, or a tighter credit spread. Investors may attempt to catalyse the improvement through active ownership; engaging company management through dialogue and voting in order to improve business practices and financial performance.

How can improvers be identified?
Improver identification can be the result of ESG data such as those provided by Sustainalytics and MSCI. This approach observes a trend in ESG headline scores during a defined period of time and, while easy to implement, relies upon third-party methodology, may struggle with data latency, and may oversimplify complex sustainability issues.

Alternatively, an investor can identify improvers by assessing the change in individual material ESG topics, aiming to quantify the impact on revenue, risk and profitability. An investor may normalise these metrics by revenue or by gross fixed assets to improve comparability over time and to peers.
For example, carbon intensity is important for the electric utilities industry, as it may indicate operational efficiency and potential risks. Figure 1 illustrates changes in carbon emission intensity. 


How does one construct improver strategies?
Improver strategies can be unconstrained and constructed without reference to sector or regional weights. Alternatively, improver identification can be implemented within sectors and regional peer groups, leading to smaller benchmark deviations but with a greater number of unintuitive selections, such as an improving base metal miner.

Construction may consider where active ownership is most likely to catalyse ESG improvement. This can create factor biases such as a small capitalisation tilt, as engagement is more likely to have a material positive impact in smaller companies. 

Construction may also draw on elements of the leader strategy and combine absolute ESG improvement with relative peer-performance. For example, Goldman Sachs found that companies that had deteriorating ESG metrics and performed worse than peer average were more likely to underperform their regional sector peers  (figure 2).


Section 2: Why invest with an improver strategy?

Improver strategies have been shown to support better ESG practices and may improve investor returns.

Why are improver strategies good for people and the planet?
Improver strategies enable investors to align their investments with their preferences. By investing via an improver strategy, investors can signal the importance of good ESG practices and motivate entities to improve. Improver strategies have the most influence when combined with active ownership.

Successful company engagement often entails specific metrics, benchmarking, well-defined targets and suitable verification, and can change business practices for the benefit of people, planet and profit.

Are improver strategies good for your portfolio? 
Academic evidence suggests improver strategies are additive to risk and return. While past performance is not a reliable indicator of future returns, a seminal 2012 paper led by Cambridge University researchers with a dataset spanning more than 600 US companies between 1999 and 2009 found that successful engagement on environmental and social topics triggered a cumulative size-adjusted abnormal return of 7.1% over the subsequent 12 months . The sentiment was echoed by a study of almost 300 companies between 2005 to 2014, which found that value-at-risk was 20%lower for engaged firms compared to a control group .

Practitioner evidence supports the academic findings. A Rockefeller study covering US equities from 2010–20 concluded that top-quintile improvers outperformed bottom-quintile decliners by 3.8% on an annual basis . Goldman Sachs broadly supported the conclusion and found that companies that began in the bottom ESG quartile at the beginning of a three-year period but ended the top half, combined with top-quartile momentum, outperformed by 1.2% on an annual basis . Goldman Sachs researchers have since declared: "We find the strongest alpha signals in laggard-to-leader moves on environmental and social factors and vice versa"  (figure 3).


What portfolio characteristics do improver strategies exhibit?
Improvers are making progress on the sustainability journey and may therefore exhibit value characteristics. When engagement is utilised, improver strategies may favour smaller companies as they are more likely to respond to stakeholder input and efforts by a single investor have the potential to make a major difference (figure 4).


Are improver strategies typically active or passive?
Passive improver strategies typically use quantitative ESG scores sourced from data providers such as MSCI or Sustainalytics. This creates challenges when attempting to identify momentum ahead of other investors, as passive improver approaches based on ESG ratings incorporate a large amount of backwards-looking published data.

Improver strategies are most efficient when they are active, as identifying future and material improvements requires deep knowledge of a company’s fundamentals, processes, management and ESG practices. Active improver strategies achieve maximum impact when they incorporate active ownership. 

Figure 5 shows fund flows into active and passive engagement strategies for the last five years. Active funds have received more flows than their passive counterparts.


How can one invest in improvers?
Improvers are an investment lens applicable to both equity and bonds. Improver strategies can be benchmarked to a conventional index, such as MSCI World or Barclays Global Corporate Aggregate, or a sustainable index, such as MSCI World SRI. Investors can deploy improver strategies in their portfolios via single instrument selection or fund selection (figure 6). Improver strategies are, arguably, the most innovative sustainable investing strategy, with numerous new product launches. In 2021, Rockefeller Asset Management partnered with Bloomberg to launch a multi-factor ESG improvers index. Also in 2021, Amundi launched a new range of ESG improver funds benchmarked to conventional indices. Both launches incorporate stakeholder engagement to speed up companies’ positive change.


What are the key risks?
The risks of investing with an improver lens mirror conventional risks such as credit, duration or equity. However, there are some specific risks: For those clients who have access to My Brown Shipley you can check your portfolio valuation online. If you have any questions, please contact your usual Brown Shipley adviser.

Non-Independent Research
The information contained in this article is defined as non-independent research because it has not been prepared in accordance with the legal requirements designed to promote the independence of investment research, including any prohibition on dealing ahead of the dissemination of this information. 

How to Use this Information
This article contains general information only and is not intended to constitute financial or other professional advice or a recommendation that any recipient of this information should make any particular investment decision. Always consult a suitably qualified financial advisor on any specific financial matter or problem that you have.

Except insofar as liability under any statute cannot be excluded, neither Brown Shipley nor any employee or associate of them accepts any liability (whether arising in contract, tort, negligence or otherwise) for any error or omission in this article or for any resulting loss or damage whether direct, indirect, consequential or otherwise suffered by the recipient of this article. 

Investment Risk
Investing in stocks either directly or indirectly carries investment risk.  The value of equity based investments may go down as well as up over time due to factors such as, market volatility, interest rates, and general economic conditions.  

Information correct as at 5 April 2021

  1. Goldman Sachs. (2018). ESG Series: Momentum & Materiality – Building blocks for ESG integration. p.4.
  2. Dimson, Elroy and Karakaş, Oğuzhan and Li, Xi, Active Ownership (August 7, 2015). Review of Financial Studies (RFS), Volume 28, Issue 12, pp. 3225-3268, 2015., Fox School of Business Research Paper No. 16-009, Available at SSRN: or
  3. Hoepner, A. G., et al. (2018). ESG shareholder engagement and downside risk, p.49.
  4. Clark, C., & Lalit, H. (2020). ESG Improvers: An Alpha Enhancing Factor. Rockefeller Capital Management.
  5. Goldman Sachs. (2018). ESG Series: Momentum & Materiality – Building blocks for ESG integration. p.5.
  6. Idem, p.6.