27.2.2024

Mergers and Acquisitions: ESG Due Diligence requires legal expertise

Nowadays, a successful company must have a strategic approach to sustainability work, accounting for the special characteristics of the company’s business. In the coming years, sustainability will permeate the strategy, business practices and value chains of companies, which are required to increase their efforts to mitigate their adverse environmental and human rights impacts.

A failure in sustainable transition or in meeting the stakeholders’ and investors’ expectations can have long-term consequences for the company. This means that sustainability cannot be ignored in mergers and acquisitions either. ESG due diligence reviews have become an increasingly important and critical part of M&A in recent years.

Sustainability is deemed to be one of the factors contributing to the success of modern business operations and ensuring the continuity of operations, and it is therefore strongly linked to the company’s value creation. In its most concrete form, ESG work means that practical tasks are carried out in accordance with the company’s policies and instructions. ESG due diligence reviews (ESGDD) dive into the practical aspects and maturity level of the company’s sustainability work by assessing ESG-related risks and possibilities.

There are different options for carrying out an ESGDD review. At the same time as the European regulatory framework of corporate sustainability is taking shape at a rapid pace, ESGDD reviews are becoming an essential part of the entire legal due diligence.

ESGDD requires legal expertise

In the everyday life of companies, sustainability is strongly connected with compliance, and in M&A situations the parties seek a legal point of view for handling compliance matters. The observations of a ESG due diligence review may become significant for the completion of an M&A transaction and for its terms and conditions, which means that a due diligence review increasingly adds elements to the purchase agreement and M&A insurances.

The risks observed in ESGDD are often legal questions that are related to various areas, such as environmental law, occupational safety or employment law. As the observations are associated with great financial and legal risks, going through them requires considerations by specialists who are familiar with the field and have deep legal expertise. For example, questions related to environmental permits and environmental liability require the perspective of an experienced environmental lawyer.

ESG due diligence and legal due diligence work have clear synergies because both use the same material in many respects. Even though sustainability reporting in accordance with the new directive ensures that companies report their sustainability using figures assured by auditors, ESGDD is much more than just assuring figures to be reported as it delves deeper into the company’s practical sustainability work and risk management.

Successful ESGDD supports the company’s strategy

A word of advice: even an experienced compliance expert carrying out ESG due diligence work must understand the practical sustainability work. In an ideal situation, a high-quality due diligence review strengthens understanding of ESG questions as part of other compliance work. Companies benefit most from DD that finds common points with the company’s sustainability targets and its strategy because, in addition to the usual deal breakers, a due diligence review provides information on what kinds of investments the object of purchase will require in the coming years. That is why companies should choose an ESGDD partner with extensive knowledge of M&A, sustainability as well as compliance work.

See also:

Anna Kuusniemi-Laine and Lia Heasman to expand C&S’s corporate sustainability service

Corporate sustainability will extend to value chains – four tips for implementing due diligence duty

Case law will ultimately clarify the interpretation of the new CSDD Directive

Latest references

We supported byFounders.vc as the Finnish counsel in their investment in DataCrunch Oy in a USD 64 million Series A funding round. DataCrunch provides scalable AI compute solutions from energy-efficient data centers in Iceland and Finland. byFounders.vc is the community-powered early-stage venture fund investing in globally ambitious teams connected to the Nordic and Baltic countries.
Case published 11.9.2025
We advised Springvest Oyj in organising a EUR 45 million Series A funding round for ReOrbit, a space technology company and a leading provider of software-first satellites. It’s the largest all-equity Series A round in Finland and one of the most significant deals overall in the European space and defence sector. The purpose of the funding round is to support ReOrbit’s growth. The round consisted of a private placement reserved for professional and institutional investors, which included, e.g. Icebreaker.vc, Expansion VC, 10xFounders, Inventure VC, Varma Mutual Pension Insurance Company, and Elo Mutual Pension Insurance Company, and an EUR 8 million public share offering, which was oversubscribed within 4.5 hours. Springvest is a Finland-based investment firm that connects unlisted growth companies with investors. ReOrbit builds sovereign satellites and connected systems for national security.
Case published 9.9.2025
Castrén & Snellman advised the lead investors Ten Eleven Ventures and Tesi in the EUR 275 million Series B financing round of IQM Quantum Computers, the global leader in building quantum computers. The round is largest Series B round ever in Finland and the second largest in the Nordics. In addition to the lead investors represented by C&S, the round was participated by several new and existing investors, including pension funds Elo Mutual Pension Insurance and Varma Mutual Pension Insurance, strategic investors Companies of Schwarz Group and Winbond Electronics Corporation, and sovereign wealth funds EIC and Bayern Kapital. Ten Eleven Ventures is the original cybersecurity-focused, global, and stage-agnostic investment firm. The firm identifies, invests in, and helps grow top cybersecurity companies addressing critical digital security needs, leveraging its team, network, and experience to build successful businesses. Since its founding, Ten Eleven Ventures has raised over USD 1 billion and made over 60 cybersecurity investments across various stages worldwide. Tesi (Suomen Teollisuussijoitus Oy / Finnish Industry Investment Ltd) is a state-owned investment company with an industrial policy mission focused on driving economic growth, renewal, and investments. Tesi invests on market terms both in venture capital and private equity funds, and directly in startups, scale-ups, and large industrial projects. IQM Quantum Computers, founded as a deep tech spin-off from Aalto University in 2019, specialises in developing quantum computers utilizing superconducting circuits. The company designs and produces quantum processors at its facility in Espoo, providing computing solutions and optimizations tailored to both research and industrial applications. In addition to its Finnish operations, IQM has expanded its presence to Germany, France, Italy, Japan, Poland, Spain, Singapore, South Korea, and the United States.
Case published 4.9.2025
We represented Vapaus Group, a leading provider of employee bicycle benefit services, in its cross-border acquisition of Azfalte, a French corporate bicycle solutions company. The acquisition accelerates Vapaus Group’s international expansion and strengthens its position in sustainable mobility by combining Vapaus’s digital platform and circular-economy capabilities with Azfalte’s established enterprise programs and partner network in France. The transaction advances Vapaus’s growth strategy and increases its ability to help employers meet well-being and sustainability goals in one of Europe’s most dynamic cycling markets. Vapaus Group is at the forefront of sustainable mobility services and has been a pioneer in the employee bicycle benefit sector since 2020 with a vision to become the leading bicycle benefit service in Europe. Vapaus has automated the employee bicycle process through its technology platform, covering payroll, invoicing, logistics, insurance, and financing. Azfalte, founded in 2020, is a pioneer of corporate cycling in France, optimizing financing, tailored bikes, insurance, maintenance, assistance, training, and carbon tracking for the benefit of its clients.
Case published 1.9.2025