ESG, SRI, Impact and Ethical Investing: Definitions, Materiality and What Each Approach Promises

What you will learn

• The precise meaning of ESG integration, exclusion (ethical) investing, SRI, best-in-class and impact investing.
• The difference between financial materiality and double materiality, and why it changes what a fund measures.
• What each approach promises, what it cannot promise, and a three-question test for any "sustainable" fund.

Explanation

The word "sustainable" on a fund covers very different methods. The structure of funds and ETFs is covered in the course "ETFs, Funds & Long-Term Investing"; here we look only at what the sustainability label adds. Five approaches dominate:

ESG integration. ESG stands for Environmental, Social and Governance. In integration, the manager uses ESG data as one more input for estimating risk and return. Nothing is automatically excluded. An oil producer with good safety data can be a large holding. The promise is better risk analysis, not a cleaner portfolio.

Exclusion or ethical investing. The fund removes companies because of what they do (tobacco, weapons, gambling) or how they behave (serious norm violations). The promise is "you will not own these companies". It says nothing about whether the remaining companies are good.

SRI (Socially Responsible Investing). Historically a values-based term; today index providers such as MSCI use "SRI" for indices that combine exclusions with a best-in-class selection (keeping only the highest-rated companies in each sector). The promise is a portfolio with a higher average ESG rating than the market.

Impact investing. The fund intends to cause a measurable positive change and reports on it. In listed equities this claim is contested, which lesson 8 discusses in depth.

Financial versus double materiality

Materiality means "important enough to influence a decision". Financial materiality asks: how do sustainability issues affect the company's cash flows and value? A carbon tax that raises costs is financially material. Double materiality adds a second direction: how does the company affect people and the planet, even when this does not (yet) cost the company anything?

This distinction decides what a fund measures. Most commercial ESG ratings (lesson 2) are built mainly on financial materiality: they measure risk to the company. A fund that calls itself "ESG" and uses such ratings may hold a high emitter if that emitter manages its risks well. EU rules lean towards double materiality: the Corporate Sustainability Reporting Directive (CSRD) requires companies in scope to report both directions (the scope is being reduced by the 2025–2026 "Omnibus" simplification, so check who currently reports), and the SFDR "principal adverse impact" indicators (lesson 5) measure harm caused by investments.

What each approach promises

The three-question test

1. Which approach? Find the words "exclude", "best-in-class", "integrate" or "impact" in the prospectus or the SFDR annex, not in the marketing brochure.
2. Which materiality? Does the fund measure risk to the company (financial) or harm by the company (double)? Look for principal adverse impact indicators or carbon-footprint reporting.
3. What is measurable? A promise such as "we will not hold companies with more than 5% tobacco revenue" is testable. "We invest in a better future" is not.

Worked example

Hypothetical example: Nordwind Industrie AG is a fictional logistics company with annual revenue of €4,000 million, of which €160 million comes from distributing tobacco products to kiosks. You hold €10,000 in a fund in which Nordwind has a weight of 2.5%.

Step 1 – tobacco revenue share: €160m ÷ €4,000m = 0.04 = 4.0%.

Step 2 – how four approaches treat the company:

• Strict ethical fund (0% tolerance for tobacco distribution): excluded.
• Typical SRI index (5% revenue threshold for tobacco-related products): 4.0% < 5%, so eligible; it then still needs a good ESG rating.
• ESG integration fund: eligible; the manager would only note that tobacco distribution carries regulatory risk.

Step 3 – your exposure: 2.5% × €10,000 = €250 in Nordwind, of which the revenue-attributable tobacco part is 4.0% × €250 = €10.

Assumptions: invented weights and revenues; fees, taxes and daily weight changes ignored. The same company is "sustainable" under one approach and not under another.

Common mistake

Practice activity

On paper: a fictional chemicals company, Rheinchem SE, has revenue of €2,500 million. €75 million comes from pesticides on a common exclusion list, and it has an above-average ESG risk rating because of strong safety management. Classify how (a) a 0% exclusion fund, (b) an SRI index with a 5% threshold and a rating requirement, and (c) an ESG integration fund would treat it. Then calculate the pesticide revenue share.

Key takeaways

• Five approaches hide behind the word sustainable; each promises something different and limited.
• Financial materiality measures risk to the company; double materiality adds harm caused by the company.
• Most ESG ratings are financial-materiality tools, so "ESG" does not mean "ethical".
• Only testable rules (thresholds, named lists, reported indicators) can be checked later.

Next step

In the next lesson you will see how MSCI, Sustainalytics and ISS actually construct an ESG rating and why they often disagree about the same company.