ESG has lost much of its appeal—both as an investment strategy and as a topic of debate.
The initial boom has given way to ‘ESG fatigue,’ compounded by geopolitical tensions, economic uncertainty, the prioritisation of issues like climate protection, and mounting scepticism over greenwashing and the true sustainability of ESG-labelled investments.
Yet beneath the headlines, ESG integration in mergers and acquisitions is accelerating. Nowhere is this more evident than in Europe, where regulatory frameworks and stakeholder expectations are compelling acquirers to view ESG as integral to valuation, risk assessment, and deal execution.
ESG Moves from Optional to Defining
With the EU’s Corporate Sustainability Reporting Directive (CSRD) and new due diligence rules on the horizon, ESG is no longer a side consideration. It is forcing upper mid-sized companies into a rigid ESG corset. Reporting standards, such as the ESRS, are considered overly complex, expensive, and impractical. Many companies feel left alone.
Acquirers must evaluate not just financial performance, but also environmental impact, labor practices, and governance standards. Balance sheets alone no longer define a deal’s value. Increasingly, leadership in M&A is judged by the ability to navigate sustainability commitments, regulatory compliance, and stakeholder scrutiny.
This shift is global. European rules may set the pace, but capital flows, consumer expectations, and investor activism are exporting ESG-driven dealmaking standards worldwide.
Although a challenging topic, ESG is a valid driver of value.
Traditional due diligence once centered on market share, operational risks, and projected common benefits. However, ESG factors have become equally critical to a deal’s success. Environmental hazards such as exposure to carbon pricing, legacy pollution liabilities, or inefficient resource use can carry significant financial consequences. Social risks—from labor controversies and fragile supply chains to the threat of strikes or litigation—pose direct challenges to stability and reputation. Governance shortcomings, including weak internal controls, opaque ownership structures, or compliance failures, can quickly erode stakeholder trust and invite regulatory action.
Premium or Discount?
Far from being a cost burden, strong ESG performance increasingly commands a premium. Companies with transparent reporting, credible net-zero strategies, and resilient supply chains are attracting higher valuations. Conversely, firms with ESG controversies or governance weaknesses often see discounts—or exclusion from deal processes altogether.
The Cost of Misjudging ESG
Ignoring ESG risks is no longer a minor oversight—it can erode deal value, derail integration, and tarnish reputations. Environmental liabilities may emerge after an acquisition, while weak supply chain practices can lead to consumer backlash. The fallout is fast, visible, and costly. Executives who rely solely on traditional valuation drivers—such as EBITDA multiples, scale, or projected mutual benefits—risk losing ground. Today, sustainable growth depends on regulatory compliance and genuine stakeholder engagement, both of which are crucial to successful transactions.
Stakeholders as Dealmakers
Regulation is only part of the story. Investors, employees, customers, and communities are applying unprecedented pressure. Activist shareholders put ESG issues on ballots. This happened in 2022 to RWE (Germany) — Activist investor Enkraft filed a shareholder motion at RWE’s AGM to require the company to draft plans for spinning off its lignite brown coal business. The proposal was added to the agenda. At the vote in April 2022, ~97% of shareholders rejected it.
Major institutional investors openly prioritize ESG alignment in capital allocation. Consumers reward companies that fulfil their sustainability promises. Any acquisition perceived as undermining these commitments risks shareholder revolt, reputational damage, or customer attrition. For acquirers, ESG is no longer theoretical—it is the currency of trust and access to capital.
Integration Challenges- Two Companies – Two ESG Practices
The integration of ESG into M&A brings its own challenges:
- Cultural alignment: Bridging gaps between promised sustainability values and actual operations requires investment in governance structures, codes of conduct, and stakeholder communication, driven by the CEO and Management Team.
- Data reliability: Incomplete or inaccurate ESG disclosures obscure risk and hinder integration. Leading organizations are upgrading their ability to collect, analyze, and validate ESG data to ensure due diligence reflects verified performance, not aspiration.
These hurdles are real but manageable—and those who master them will differentiate themselves in a crowded market.