Impact investing and ESG investing: the difference

ESG investing and impact investing are often treated as the same thing. They are not.

ESG investing looks from the outside in. It asks how environmental, social and governance issues affect a company's risks and returns. An ESG investor may hold a well-run oil company because its ESG risks are well managed and priced.

Impact investing looks from the inside out. It starts with a social or environmental goal, such as clean water for a district or credit for women-led businesses, and invests in a way that is meant to cause that change. The investor measures the change and wants to show that its money helped make it happen.

Both are legitimate. The problem arises when an ESG fund is marketed as if it were creating impact.

Definitions

• ESG investing: using material ESG information to improve investment decisions and manage risk.
• Impact investing: the Global Impact Investing Network (GIIN) defines it as investment made with the intention to generate positive, measurable social and environmental impact alongside a financial return.

The key differences

Investor contribution and company impact

It helps to separate two questions:

1. Company impact: does the company's product or activity improve outcomes? A solar company has positive company impact.
2. Investor contribution: did this investor's money or influence make that impact bigger or more likely? Buying existing shares of the solar company from another investor adds little. Providing new capital that would not otherwise be available, taking extra risk, or pushing a company to change through engagement can add a lot.

Research by Jonathan Berk and Jules van Binsbergen found that, at current levels, ESG-driven selling of a company's shares changes its cost of capital by only about 0.44 basis points, too little to change its decisions. Their conclusion is that new capital in primary markets and active engagement are more likely to make a difference than trading existing shares.

Size of the market

• The GIIN's 2024 sizing study put global impact investing assets at about $1.571 trillion, managed by more than 3,900 organisations with known or estimated assets, and estimated growth of about 21% a year since 2019.
• In India, the CFA Society India report of March 2026 put impact investing equity at about $2.9 billion across 275 enterprises in 2023, down from about $6 billion in 2022.

Signs of impact-washing

• No stated theory of change or target outcome.
• Impact claimed from simply owning listed shares.
• Only outputs reported (money deployed), never outcomes (lives changed).
• No baseline or comparison with what would have happened anyway.
• Impact reports written by the fund itself with no independent review.