Our companies

Monteiro, the founding company of Groupe M, is a French industrial company serving low-carbon industries. Since 1999, Monteiro has been developing mechanical engineering expertise built around a core business: high-technology welding.

The company offers its customers turnkey and unplanned project management, from the design phase through to preparation, including inspection and testing in piping, boilermaking and welding.

Since 1969, CHAUSSY, a Groupe M company, has been committed to bringing its technical know-how to high-tech industries in the fields of machining, maintenance, special-purpose machinery manufacturing and mechanical installation. Over the years, it has also developed its expertise in valves through the company Ireland Valves (IRI), as well as in vibration analysis and balancing through the company Mécavibre. CHAUSSY has equipped itself with innovative technical resources to meet the industrial challenges of tomorrow. Thanks to its optimised process, the company offers machining and mechanical engineering solutions in compliance with applicable standards.

Drawing on its know-how, the company provides its customers with the best turnkey services, from the design phase to the installation of complex equipment or parts for the most demanding sectors.

NOVA, a Groupe M company, has become a key player in engineering, inspection and testing. The company comprises 2 areas of expertise: integrated engineering consultancy and inspection/NDT.

These two areas of expertise enable it to meet the needs of its customers, particularly major industrial clients, by supporting them in their flagship projects.

The company can deploy its teams throughout France and has recognised expertise in the development of new techniques.
NOVA offers comprehensive solutions in compliance with the applicable standards, regulatory requirements and construction codes.

CTI is a company specialising in boilermaking, welded fabrication and skid or container integration.

Since it was founded in 1987, it has placed its expertise at the service of high-tech industries, offering bespoke solutions for boilermade and welded assemblies.

The company has three workshops covering a total area of 10,000 m², equipped with highly capable machinery. Its exceptional manufacturing capacity enables it to produce equipment weighing several tens of tonnes and to export these products and its expertise internationally.

Secomoc, part of Groupe M, specialises in industrial boilermaking. It works both on projects within the group and as an independent contractor for external clients.

Drawing on its expertise, Secomoc contributes to the manufacture and maintenance of large-scale metal equipment. SECOMOC, a leader in the construction and maintenance of large metal storage tanks.

Maten Équipements, a Groupe M company, specialises in the design, manufacture, installation and maintenance of industrial equipment for the most demanding sectors. Drawing on its technical expertise, it supports its customers in delivering bespoke solutions that meet the quality, safety and performance requirements specific to complex industrial environments.

Building on the complementary skills of the Groupe M entities, Maten Équipements offers a comprehensive service ranging from engineering to equipment commissioning, including manufacturing, inspections and on-site interventions. This integrated approach enables it to provide long-term support for projects in the nuclear, energy and process industries.

ECCR (Études Calculs Conception Réalisation) is the in-house engineering office of Groupe M, providing engineering, design and technical calculation services. It operates across a wide range of industrial sectors, including nuclear, petrochemicals and metallurgy, carrying out detailed studies and construction follow-up.

Thanks to its expertise, ECCR plays a key role in delivering complex projects.

Maten Métrologie, a subsidiary of Groupe M, specialises in the measurement and calibration of tanks, tankers and other industrial equipment requiring precise volume inspection.

MATEN Métrologie specialises in volume metrology and the measurement of containers (tanks, vessels, tankers, etc…) for calibration purposes.

Within the Facility Management division of Groupe M, Prose plays a strategic role in the most demanding nuclear environments. The entity brings together three complementary units: Prose FM, Prose LOG and Prose DEM.

Prose LOG specialises in industrial and nuclear logistics, while Prose DEM focuses its know-how on decommissioning activities. Prose FM, for its part, covers all site support, operations and facility life cycle management activities.

Prose’s expertise spans key areas such as radiation protection, safety, risk management, decontamination, decommissioning, radioactive waste management and access in confined environments, as well as a comprehensive multi-service cleaning offering.

DB Power, a subsidiary of Groupe M, specialises in mechanical maintenance and engineering services for the nuclear, industrial and naval sectors.

Drawing on its expertise in machining, metrology, hydrostatic testing and lifting, it handles the study, design and assembly of solutions tailored to its customers’ technical requirements. With 15 years’ experience in NPP maintenance, DB Power delivers high-precision, high-quality work both on site and in the workshop.

Part of the Facility Management division of Groupe M, Altitude TS brings recognised know-how in work at height, difficult access and operations in sensitive environments, whether industrial or nuclear. Drawing on its technical expertise and mastery of rope access, scaffolding and confined space operations, Altitude TS provides maintenance, inspection and safety services that meet the highest safety and quality requirements.

ALLIAGES has established itself as a major player in industrial maintenance and the delivery of complex installations. The company supports its customers from design through to construction, assembly and maintenance of their equipment, with an unwavering commitment to quality, safety and performance.

Its expertise is now organised around several complementary entities: Alliages Industries France and the Florange Fabrication Workshops, specialising in boilermaking, piping and industrial maintenance work; Alliages Énergie, an expert in the servicing and maintenance of rotating machinery; and Alliages SA and Alliages Industries Luxembourg, dedicated to boilermaking and piping work, industrial maintenance, as well as logistics and metal handling.

EFINOR has established itself as a major player in design, manufacturing and industrial maintenance. The company supports its customers across a wide range of sectors, including maritime, defence, energy and nuclear, with an unwavering commitment to quality, safety and performance.

Its expertise is now organised around several complementary entities:

EFINOR Chantiers Navals, specialising in the design, construction, repair and maintenance of multi-purpose vessels, as well as in supporting complex maritime projects.

EFINOR Ingénierie & Process, an expert in engineering services, technical assistance and calculations for turnkey solutions, from the design through to the commissioning of special-purpose machinery and industrial facilities.

EFINOR, the overall entity, which brings together all of the group’s capabilities to meet the most diverse industrial needs, from industrial maintenance to the manufacture of components and tanks for the energy, defence and agri-food sectors.

Lakers, a Groupe M company, supports industrial clients in delivering highly technical projects through its expertise in industrial piping, mechanical installation and high-integrity welding. The company works on complex projects in the nuclear, energy, chemical, pharmaceutical and process industries.

Drawing on the complementary skills of the Groupe M entities, Lakers offers a comprehensive service ranging from fabrication and installation to maintenance and on-site interventions. Its know-how and its high standards of quality, safety and performance make it a trusted partner for the most demanding industrial projects.