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Definition

ESG investment due diligence

ESG investment due diligence is a pre-deal review of material environmental, social and governance risks, opportunities, liabilities, controls and management capacity that could change an investment's valuation, terms, approval or ownership plan.

What is ESG investment due diligence?

ESG investment due diligence tests sustainability issues before capital is committed. The output should be an issue register that connects each finding to a source document, financial effect, deal response, owner and review date.

Why does ESG investment due diligence matter to you?

An investor may ask for permits, incident logs, energy and water records, labour claims, supplier controls, board oversight and planned corrective spending. Missing or conflicting records can change the valuation, approval conditions or ownership plan. Keslio's investment strategy development work can place those findings inside the wider investment case.

How does ESG investment due diligence work?

Set the company, sites, time period and proposed transaction first. Identify sector and country issues, then test management statements against permits, invoices, registers, contracts, site observations and interviews. Record each material risk, opportunity or liability, estimate its timing and financial effect, and state whether it changes the model, price, agreement, approval condition or post-close action plan.

What mistakes should you avoid?

  • Using one ESG score without reviewing the records beneath it.
  • Listing a risk without its source, owner, cost, deadline or deal response.
  • Treating a missing document as proof that the underlying control does not exist.
  • Leaving a material finding outside the investment memo and approval decision.

Is ESG investment due diligence the same as ESG integration?

No. Due diligence is the pre-deal investigation. ESG integration is the wider practice of using material ESG information throughout analysis and investment decisions, including after the deal.

What should you send when an investor asks for ESG due diligence?

Start with the investor's request list and answer each item against an indexed document. Add permits, incident records, calculation notes, management responses and costed corrective plans where requested. Mark what is missing or unresolved instead of filling the gap with a general ESG report. If the investor asks for a draft issue log or management action plan, separate company facts from the investor's valuation and approval decision.

Example

Suppose an investor reviews a hypothetical food and beverage processor with three plants in the Philippines. It requests 24 monthly workplace injury records from each plant, so 3 plants x 24 months = 72 records. The company supplies 68, leaving 4 missing records, all from the same plant.

The document register also shows an open machine-guarding inspection notice for that plant and no closure letter. The investor does not treat the missing records as proof of further incidents. It asks for the regulator's notice, repair invoices, current photographs, the closure filing and a downtime estimate. The investment memo keeps the issue unresolved until that evidence arrives, assigns an owner and deadline, and states whether the finding supports a price adjustment, closing condition or post-close action.

Where it comes up

PRI PC-PE ESG Factor Map general company and industry-specific target-company questionsPRI PC-PE ESG Factor Map, General company questions and Industry-specific questionsOfficial sourcePRI asset-owner due diligence of a private debt manager, question 2.2 on identifying material ESG factors and incorporating them into investment decisionsPRI Responsible Investment DDQ for Private Debt Investors, question 2.2Official sourcePRI asset-owner due diligence of a private debt manager, question 2.5 on documenting ESG due diligence in investment decision-makingPRI Responsible Investment DDQ for Private Debt Investors, question 2.5Official source

Related terms

ESG integration

ESG integration is the systematic use of financially material environmental, social and governance information in investment analysis and decisions to improve the assessment of risk and return.

Materiality

Materiality is the test a company uses to decide which sustainability topics matter enough to manage or report because they could affect its finances, reflect significant impacts on people or the environment, or both.

Climate-related transition risk

Climate-related transition risk is the financial risk that policy, legal, technology, market, or reputation changes create as economies move towards lower greenhouse gas emissions.

Physical climate risk

Physical climate risk is the potential for acute events or chronic climate shifts to damage assets, interrupt operations, disrupt supply chains, and change revenue, costs, cash flows, financing, or insurance.

Responsible Investing

Responsible investing considers environmental, social and governance information when investors allocate capital, manage holdings and use their influence to pursue stated financial objectives and, where applicable, sustainability objectives.

Sources

Last verified 2026-08-21

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ESG investment due diligence Definition | Keslio