ESG vs SRI vs Impact Investing — What's the Difference?
ESG, SRI, and impact investing compared: what each approach means, how they differ, which one is right for your career or investment strategy, and how they are converging in 2026.
ESG, SRI and Impact Investing — Overview
ESG, Socially Responsible Investing (SRI), and impact investing are three related but distinct approaches to incorporating non-financial factors into investment decisions. The terms are often used interchangeably — incorrectly. Understanding the differences matters for finance professionals, investors, and anyone building a career in sustainable finance.
Socially Responsible Investing (SRI)
SRI is the oldest of the three approaches, originating in the 1960s and 1970s through ethical and religious investment movements (e.g. excluding companies associated with alcohol, tobacco, gambling, weapons).
Core mechanism: Exclusionary screening — removing companies or entire sectors based on ethical or values-based criteria.
Limitations: Values-based exclusions can vary significantly between investors; no standardised framework; may reduce diversification.
ESG Investing
ESG investing incorporates Environmental, Social, and Governance factors into investment analysis — not necessarily based on ethics, but on materiality and risk. An ESG investor may still hold oil companies if they have strong governance and are managing their environmental transition well.
Core mechanism: ESG integration (risk-adjusted returns), best-in-class screening, or ESG-weighted portfolios.
Key difference from SRI: ESG is analytical rather than moral — it uses ESG data as an input to investment analysis to improve risk-adjusted returns, not purely to express values.
Impact Investing
Impact investing targets measurable positive social or environmental outcomes alongside financial returns. It requires intentionality (the investor intends to create impact), measurability (outcomes are tracked), and additionality (the investment creates impact that would not have happened otherwise).
Core mechanism: Directing capital into specific projects or companies to achieve defined outcomes — renewable energy projects, affordable housing, microfinance, healthcare in underserved markets.
Key difference: Impact investing explicitly measures and reports on outcomes; ESG investing focuses on risk and returns.
Comparison
| Feature | SRI | ESG | Impact Investing |
|---|---|---|---|
| Primary driver | Values/ethics | Risk/return | Intentional outcomes |
| Main mechanism | Exclusions | Integration/screening | Targeted capital allocation |
| Financial return | May sacrifice some return | Seeks market-rate returns | Concessionary to market-rate |
| Measurability | Low | Medium (ESG scores) | High (impact metrics) |
| Where common | Retail/ethical investors | Institutional investors | PE, development finance, philanthropy |
How They Are Converging
In 2026, these approaches are converging under the broader umbrella of "sustainable finance" — driven by the ISSB's IFRS S1/S2 standards, EU SFDR classifications, and growing investor demand for standardised ESG data. Finance professionals need to understand all three to work effectively in this space.
ACCA's curriculum — particularly SBR and AFM — covers the frameworks underpinning all three approaches. Explore ACCA with Learnsignal.
Further Reading
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Learnsignal Education Team
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