ESG and Sustainable Investing — The Performance Evidence

Environmental, Social, and Governance (ESG) investing has grown from a niche concern of ethical investors into a mainstream fixture of institutional portfolio management. Global ESG assets under management exceeded $30 trillion at their 2022 peak. Yet the period since has also brought intense scrutiny: performance disappointments in 2022, high-profile greenwashing cases, and growing political backlash in some markets — particularly in the United States, where several states have passed legislation restricting public pension funds from applying ESG criteria.

For high-net-worth investors, the question of how to approach ESG investing requires cutting through significant marketing noise to identify what the evidence actually shows.

The ESG performance debate: what the research says

The foundational meta-analysis on ESG and performance was conducted by Friede, Busch, and Bassen (2015), reviewing over 2,000 individual studies. Their conclusion: across the aggregated evidence, around 90% of studies found a non-negative relationship between ESG factors and financial performance, with a positive relationship reported in roughly 63% of the meta-analyses reviewed and a negative one in under 10% of cases. The weight of academic evidence leans positive — but not decisively, and with important caveats.

The challenge is that "ESG performance" is not a single, stable phenomenon. The relationship between ESG scores and investment returns varies by:

• Time period: ESG funds significantly outperformed in 2019–2021, largely because ESG screens tend to exclude fossil fuels and overweight technology stocks. The tech-led bull market of that era was effectively a tailwind for ESG.
• Region: ESG has worked better in some markets (Europe, where ESG integration is more advanced) than others (the US, where the political environment is more contested).
• Factor exposure: many ESG portfolios have inadvertent factor tilts — toward quality, growth, and large-cap stocks — that explain some of their performance independently of the ESG screens themselves.

2022: the ESG stress test

The year 2022 was the most challenging period for ESG investing since the approach entered the mainstream. Energy stocks surged as oil and gas prices soared following the Russia-Ukraine war. Defence stocks rose sharply as European nations accelerated rearmament. Both sectors are excluded from the majority of ESG funds.

Many ESG-focused funds underperformed their mainstream benchmarks by 5–10% in 2022 alone. This was not a rounding error — it was a meaningful, sustained drag that reflected a genuine structural disadvantage: ESG exclusions had removed the sectors that performed best in the specific macro environment of 2022.

The honest interpretation is that ESG exclusions introduce sector bets. Excluding fossil fuels is essentially a short bet on energy. In an inflationary, geopolitically turbulent environment, this bet is a significant performance headwind. In a benign, growth-oriented environment (2010–2021), the same exclusion looked like a smart forward-looking decision.

The Governance factor: the strongest link

Within the ESG triad, the "Governance" component has the most robust and consistent academic support. Companies with strong governance structures — independent boards, transparent reporting, aligned executive incentives, strong audit functions, low related-party transaction risk — are demonstrably less likely to suffer the catastrophic governance failures (fraud, accounting scandals, regulatory penalties) that can permanently destroy shareholder value.

The list of high-profile corporate collapses driven by governance failure is long: Wirecard, Carillion, Enron, WorldCom, Theranos. In each case, strong independent governance would have constrained or exposed the problem earlier. The "G" in ESG is therefore best understood not as an ethical consideration but as a risk management discipline.

The "E" (environmental) and "S" (social) factors have weaker and more context-dependent links to financial performance. Environmental exposure to regulation, stranded asset risk, and the carbon transition is a real long-term financial risk — but the timeline for these risks to materialise financially is uncertain, which makes them difficult to price systematically.

The greenwashing problem

The mainstreaming of ESG has created powerful commercial incentives for fund managers to label their products as "sustainable" or "ESG-integrated" regardless of the rigour of their actual approach. This greenwashing is pervasive and damages investor trust.

The EU's Sustainable Finance Disclosure Regulation (SFDR), introduced in 2021, attempts to standardise ESG claims across European-domiciled funds. It creates three categories:

• Article 6: no sustainability claim; mainstream funds.
• Article 8: "promotes" environmental or social characteristics; the broadest category; often criticised for being insufficiently demanding.
• Article 9: sustainability is the primary investment objective; the most stringent category; should involve explicit ESG targets and measurement.

In practice, the distinction between Article 8 and Article 9 funds varies considerably, and regulators have been active in downgrading funds that claimed Article 9 status without sufficient substance.

The UK's Sustainability Disclosure Requirements (SDR), introduced by the FCA in 2024, create a parallel UK labelling regime with four labels: Sustainability Focus, Sustainability Improvers, Sustainability Impact, and Sustainability Mixed Goals. The intention is to provide clear, regulated labels for UK-domiciled funds.

For investors, the labelling regime is a floor, not a ceiling. Reading the fund's full ESG policy, its exclusion list, the methodology for ESG scoring, and its stewardship and voting record is essential for genuine evaluation — the headline label is a starting point, not the answer.

The Bloomberg investigation into green bonds is instructive. A significant proportion of bonds marketed as "green" were used for purposes that would qualify as ordinary business-as-usual activities, with the "green" label applied to projects the issuer would have funded regardless. The additionality — whether the green label actually caused additional environmental benefit — was frequently absent.

Practical approaches for HNW investors

Three broad approaches exist, each with different implications:

Negative screening (exclusion-only): the simplest approach. Exclude specific sectors (tobacco, weapons, fossil fuels, gambling, adult entertainment) from the portfolio. This is the oldest form of ethical investing. It introduces sector bets and may reduce the investable universe, but it is transparent and straightforward to implement. Most mainstream investment platforms offer screened portfolios or ETFs.

ESG integration: incorporating ESG data into fundamental investment analysis as a risk management tool. Not "exclude all fossil fuel companies" but "evaluate this oil company's carbon transition plan, regulatory exposure, and governance quality as part of the investment case." This approach does not necessarily reduce returns or introduce sector bets — it simply adds a risk lens. Many of the largest institutional asset managers (BlackRock, Schroders, Legal & General) claim to practise some form of ESG integration across their mainstream funds.

Impact investing: investing with the explicit intention of generating measurable positive environmental or social outcomes alongside financial returns. The purest form of the ESG mandate. Typically requires more specialist, often less liquid, investment vehicles — green infrastructure, social housing bonds, sustainability-linked loans. Appropriate for investors with genuine values-alignment objectives and the liquidity profile to accommodate less liquid assets.

For most HNW investors, a pragmatic approach combines strong governance screening across the whole portfolio (avoiding companies with clear governance red flags), modest negative screening for the most reputationally uncomfortable sectors, and a satellite allocation to genuine impact or sustainability-focused strategies if values alignment is a priority.

Compliance note

This guide is for informational purposes only and does not constitute personal financial or investment advice. Investments can fall in value as well as rise. ESG investing does not guarantee superior financial returns. ESG ratings and classifications are subjective and vary between providers. Regulatory frameworks are evolving and may change. Specific funds mentioned are cited for illustrative purposes only. Always seek qualified independent financial advice before making investment decisions.

How Global Investments can help

We work with clients across the spectrum of ESG engagement — from those seeking a purely financial approach to those with strong sustainability commitments. Our team can assess the genuine ESG credentials of existing fund holdings, identify where claimed sustainability characteristics are not matched by the underlying portfolio, and design an approach that reflects your values without unnecessarily sacrificing financial outcomes. Contact us to discuss how ESG considerations can be integrated sensibly into your investment strategy.