Institutional buyers have changed the way they assess acquisition risk. Five years ago, environmental, social, and governance issues were often reviewed informally, if they were reviewed at all.
Today, ESG is a defined workstream in many institutional M&A processes, especially where private equity sponsors, strategic buyers, or regulated-sector investors are involved.
Deloitte’s 2024 ESG in M&A Trends Survey reported that 91% of respondents had high or very high confidence in their organization’s ability to evaluate an acquisition target’s ESG profile, up from 74% in 2022.
This shift is primarily driven by limited partner (LP) mandates, tightening regulatory disclosure requirements, and a growing recognition that environmental liabilities, governance failures, and social risk exposures can produce material losses.
Buyers who previously bypassed rigorous review have often inherited carbon liabilities or labor violations that were identifiable pre-close; the cost of such omissions has fundamentally changed the standard of practice.
Why ESG Has Entered the M&A Due Diligence Process
ESG has entered M&A because investors, regulators, and buyers now treat sustainability risk as part of enterprise risk. That shift is especially evident in private equity, where limited partners often expect fund managers to demonstrate how ESG factors are identified, assessed, and monitored throughout the investment lifecycle.
Several structural factors have forced ESG due diligence in M&A into the spotlight:
- LP and investor mandates. Institutional LPs increasingly require ESG assessment as a prerequisite for fund compliance with responsible investment commitments.
- Regulatory pressure. Frameworks such as the Sustainable Finance Disclosure Regulation (SFDR) in Europe and emerging SEC climate disclosure rules require buyers to understand ESG exposure in acquired assets. According to PwC’s Global M&A Trends report, ESG is now a top-tier priority for creating and preserving deal value.
- Reputational and financial risk. Post-acquisition failures attract intense public scrutiny, which can damage both the target’s and the acquirer’s brands.
- Valuation impact. Businesses with poor labor practices or high carbon intensity increasingly trade at a discount. Conversely, research from McKinsey & Company suggests that strong ESG propositions correlate with higher value creation.
- Integration complexity. Identifying issues before signing allows buyers to price or structure around remediation efforts, which are often expensive and operationally demanding post-close.
What ESG Due Diligence Actually Covers
A comprehensive, sustainable M&A due diligence process is typically divided into three distinct workstreams:
Environmental Workstream
This pillar focuses on the environmental due diligence for acquisitions. The environmental workstream focuses on the target’s direct and indirect exposure to environmental risk. For industrial, energy, manufacturing, logistics, and real estate-heavy businesses, this review can be material to valuation.
Buyers often assess:
- Scope 1, 2, and, where relevant, Scope 3 emissions
- Site contamination and remediation obligations
- Waste disposal practices and environmental permits
- Exposure to carbon pricing, regulatory phase-outs, or stranded asset risk
- Water use, raw material sourcing, and deforestation exposure in supply chains.
Social Workstream
The social workstream examines how the target manages people, workplace risks, and affected communities. This can include wage compliance, health and safety performance, union relations, employee turnover, diversity data, and employment-related claims.
For companies with complex sourcing, buyers may also review supplier labor standards. That is especially relevant where the target depends on low-cost manufacturing, agricultural inputs, logistics networks, or suppliers in higher-risk jurisdictions.
Governance Workstream
This involves a rigorous ESG risk assessment in corporate transactions. It covers board composition, executive compensation alignment, and the robustness of anti-corruption programs.
How ESG Findings Affect Deal Structure and Valuation
The findings from these workstreams directly influence the final terms of the agreement. Buyers conducting due diligence in M&A increasingly use ESG data to negotiate price adjustments or post-close remediation commitments.
Specifically, ESG factors in deal valuation help quantify carbon liabilities or contamination obligations, which may be reflected in working capital adjustments or escrow arrangements.
Governance deficiencies identified pre-close are often addressed through closing conditions, such as board restructuring or compliance upgrades.
What Sellers Should Prepare Before Going to Market
- Compiling a baseline ESG data pack. This includes emissions inventories, safety records, and governance documentation.
- Environmental liability review. Identify known contamination, missing permits, waste management issues, or remediation obligations before diligence begins.
- Governance documentation. Organize board composition, committee charters, ownership records, compliance policies, anti-bribery controls, and escalation procedures.
- Proactive remediation. Addressing known compliance gaps before diligence begins prevents larger, reactive price adjustments later.
- Supply chain transparency. For businesses with complex sourcing, documenting tier-one and tier-two supplier information is essential for buyers with ESG mandates.
- Independent assessments. Commissioning an independent ESG report can help a seller control the narrative and pre-empt buyer findings.
How PE Firms Are Integrating ESG Into the Deal Lifecycle
Private equity firms have moved toward a lifecycle approach to ESG:
- Pre-acquisition screening
- Deal teams identify ESG red flags before committing full diligence resources. High-risk sectors, unresolved compliance issues, or reputational concerns may affect the firm’s decision to proceed.
- Formal diligence
- ESG review runs alongside financial, legal, tax, and commercial workstreams. Specialist advisors may review emissions, site risks, labor practices, supply chains, or governance controls.
- Valuation and risk modeling
- ESG findings are built into the investment case. They may affect revenue assumptions, cost forecasts, capex needs, downside cases, or exit expectations.
- 100-day planning
- Post-close ESG priorities are built into the integration roadmap. This may include emissions reporting, compliance upgrades, safety improvements, supplier reviews, or governance changes.
- Hold-period monitoring and LP reporting
- PE firms track ESG metrics during ownership and report progress to LPs as part of fund-level responsible investment disclosure. This helps show how ESG risks are managed after acquisition, not only identified before closing.
Conclusion
Buyers now use ESG review to identify risk, test valuation assumptions, negotiate deal protections, and plan post-close remediation before the problem becomes more difficult to manage.
Likewise, sellers who prioritize ESG documentation move through the process faster and negotiate from a position of strength. As regulatory requirements tighten, the quality of these assessments will continue to separate disciplined market participants from those who still view sustainability as a secondary concern.
