RSM, the 6th largest global audit and consulting network, conducted the buy-side financial and tax due diligences for RSK Group, a global leader in environmental, engineering and technical services, in connection with its acquisition of ADEV Environnement, a multidisciplinary consultancy and engineering firm.

Through this transaction, RSM further strengthens its positioning as a trusted advisor in strategic acquisitions within the environmental engineering and energy-biodiversity-climate data sectors.

 

Acquisition of ADEV Environnement by RSK Group

Based in Cheshire, UK, RSK Group has acquired ADEV Environnement, which provides its expertise to a wide range of clients (EDF, ENGIE, TotalEnergies) across environmental, biodiversity, sustainable urban planning, and energy-related topics. The firm operates from two offices in the Tours area—Le Blanc (36) and Larçay (37)—and employs 20 people.

ADEV Environnement will work alongside the existing RSK France entity and will retain all employees as well as its brand name. The company will operate under the leadership of Emmanuel Costa, Managing Director of RSK France. Sébastien Illovic, former owner of ADEV, will support the transition as a consultant.

ADEV marks RSK’s 33rd acquisition over the past year, further affirming the Group’s commitment to strengthening and diversifying its portfolio. The Group plans to continue its expansion in France through this acquisition.

Alan Ryder, founder and CEO of  RSK, stated: “In response to the ongoing global demand for sustainable solutions, RSK is committed to becoming the world’s leading provider of such services, helping our clients make the progress urgently needed if we are to achieve the United Nations Sustainable Development Goals. ADEV is a valuable addition to our group, offering services that directly support these objectives.”

Emmanuel Costa, Managing Director of RSK France, emphasized: “France, one of the leading nations in the ecological transition, aims to become the first European country to decarbonize by 2050. This ambitious goal reflects a collective awareness that human activity must become more sustainable. The challenge is immense and can, in part, be met by an ecosystem of companies built on the commitment of eco-responsible individuals who work daily to protect the environment.”

“This is the driving force behind our development in France, where RSK aims—together with its partners, its international centers of innovation and operational excellence, and new investments—to provide clients with an integrated offering at every stage of their projects.”

 

The RSM team

The RSM team involved was composed of :

  • Financial due diligence : Eric Fougedoire, Charles Tiran, Maxime Pothron
  • Tax due diligence : Cécile Guyot, Déborah Kocher

RSM is the 6th largest global network of audit, consulting and accounting firms, operating in more than 120 countries and comprising over 51,000 professionals and partners.

In France, RSM is a significant player in audit, accounting, and consulting, with offices located in major regional economic centers, including Paris, Lyon-Chambéry-Grenoble, Montpellier-Nîmes, Nantes-Laval, Strasbourg-Colmar, La Réunion and Mayotte. RSM currently employs over 1,200 professionals across the country and intends to further pursue its regional growth. The Group’s multidisciplinary offering is structured around five core service lines: Audit, Accounting, Consulting, HR & Payroll, Legal & Tax Advisory.

RSM’s Corporate Finance division supports companies and their executives, investment funds, as well as investors and shareholders—both in France and internationally—in securing and optimizing their financial decisions. The team comprises 20 professionals based in Paris and across the regions, including 3 partners. RSM Corporate Finance provides services in Transaction Services, Valuation & Complex Financial Modelling, Capital Operations, and Restructuring.

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