What Groupe M does

Groupe M is a privately held French industrial services group (SAS) founded in 1999 and headquartered at Saint-Paul-Trois-Châteaux, operating as an integrated ensemblier for complex mechanical and nuclear projects. The company delivers end-to-end project execution across engineering, fabrication, installation, maintenance, and facility management for industrial clients in nuclear, energy, defense, naval, chemical/petrochemical, pharmaceutical, agri-food, and research sectors. Its technical core spans high-technical welding (developed since 1999), precision machining, boiler-making (chaudronnerie), industrial valve engineering (IRI), metrology and non-destructive testing, vibratory analysis for predictive maintenance, and nuclear facility support services including decontamination, dismantling, waste treatment, and radioprotection.

The group is structured around seven divisions (Contracting, Réacteurs, Industrie & Process, Fabrication & Construction Chaudronnée, Mécanique et Robinetterie, Contrôle/Métrologie/Assistance Technique, Facility Management) and 15+ wholly-owned subsidiaries including Monteiro (the historic entity), Chaussy, CTI, NOVA, SECOMOC, ECCR, Maten Métrologie, IRI, DB Power, Prose, Altitude TS, Alliages Groupe, Efinor, and the newly acquired Lakers (UK) and DPI. Operations span more than 15 sites across France plus international locations in UAE (via Fabtech Group partnership), Cameroon, and the UK. Differentiating capabilities rest on extensive nuclear-sector certifications (ISO 19443, CEFRI-E, EDF UTO, Nouveau Nucléaire, Qualianor RP, MASE, ISO 3834-2, EN 1090-1, COFRAC ISO 17020) and a 11,000 m² flagship piping factory described as the most dimensioned in Europe.

The business model is enterprise project-based services, generating revenue through direct field sales to major industrial operators including EDF, Total Energies, ITER, Sanofi, Orano, Framatome, Naval Group, Westinghouse, Air Liquide, CEA, Michelin, Arkema, and Engie. Pricing is quote-driven and not publicly disclosed. Go-to-market is anchored on technical sales teams, long-cycle project execution, multi-year qualification relationships, and event-based brand building (industry championships, trade exhibitions such as Fabriqué en France à l'Élysée). Growth has been executed through an aggressive acquisition program (12+ deals from 2019 to 2026), complemented by geographic expansion into the Middle East, Africa, and the United Kingdom, and the launch of the Facility Management division in 2025. The company is led by Julien Monteiro (Dirigeant; Entrepreneur of the Year 2024 Auvergne-Rhône-Alpes; Choiseul 100 2026) and Annabel Vigier.

Name

Groupe M

Legal name

GROUPE M

Website

https://groupem.org

Company type

Private

Founded year

1999

Operating status

Operating

Headcount range

1,001–5,000 employees

Short description

Groupe M is a French industrial ensemblier delivering integrated engineering, fabrication, welding, machining, maintenance, and facility management services to enterprise clients in nuclear, energy, defense, naval, pharmaceutical, and chemical sectors, organized across 15+ wholly-owned subsidiaries.

Ownership category

akta.pro rank

Product category

Industrial Mechanical Engineering Services

NAICS

Industrial Machinery Manufacturing (3332), All Other Industrial Machinery Manufacturing (333248), Instruments and Related Products Manufacturing for Measuring, Displaying, and Controlling Industrial Process Variables (334513)

SIC

Special Industry Machinery (No Metalworking Machinery) (3550), General Industrial Machinery & Equipment (3560), Industrial Instruments For Measurement, Display, And Control (3823)

akta.pro primary industry

Chemical Processing Equipment (Reactors, Mixers, Agitators) (IMAHAEAA)

akta.pro secondary industry

Instrumentation & Process Control (I&C) (EDAOABAF)

Keywords

• Industrial mechanical services
• Nuclear engineering services
• Boiler-making fabrication
• Industrial piping welding
• Facility management services

Headquarters

HQ city

Saint-Paul-Trois-Châteaux

HQ country

France

HQ region

Europe

Offices16 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Infrastructure, Technology or R&D, Marketing or Sales

Revenue model

1. Industrial Project Services: Full-service industrial project delivery from engineering through fabrication, installation, and maintenance. Revenue generated through project-based contracts for complex mechanical engineering projects in nuclear, defense, energy, and process industries.
2. Site Maintenance Services: On-site and workshop maintenance services for critical mechanical equipment, rotating machines, and industrial installations.
3. Metrology and Control Services: Volume measurement, tank calibration, dimensional control, hydraulic testing, and leak testing services for industrial equipment compliance.
4. Facility Management Services: Integrated facility management for nuclear environments including cleanliness, logistics, waste management, decontamination, and radiological protection services.

Go-to-market motion2 records

Distribution channels2 records

Marketing channels4 records

Core offering

Groupe M is an integrated industrial ensemblier (industrial integrator) that delivers complex mechanical projects from engineering through fabrication, installation, and maintenance for demanding industrial environments. The company specializes in piping, high-technical welding, boiler-making (chaudronnerie), precision machining, mechanical assembly, industrial valves, non-destructive testing, metrology, vibratory analysis, and facility management. It serves the nuclear, energy, defense, naval, chemical/petrochemical, pharmaceutical, agri-food, and research sectors with clients including EDF, Total Energies, ITER, Sanofi, Orano, Framatome, Naval Group, and Air Liquide.

Product overview

Groupe M is an integrated industrial services group offering comprehensive project management for complex mechanical projects with high added value in France and internationally. The company operates through seven strategic divisions: Contracting (EPCI and nuclear new build), Réacteurs (reactor maintenance), Industrie & Process, Fabrication & Construction Chaudronnée (boiler-making), Mécanique et Robinetterie (mechanical and valves), Contrôle, Métrologie & Assistance Technique (control, metrology, and technical assistance), and Facility Management. Key products and services include specialized machining, on-site and workshop maintenance, special machines, CND/END non-destructive testing, metrology, vibration analysis, industrial valves, scaffolding/access solutions, radioprotection assistance, decontamination/dismantling, waste treatment, industrial cleaning, and nuclear logistics. The group serves critical sectors including nuclear, energy, defense, naval, chemical/petrochemical, pharmaceutical, agri-food, and research. Group entities include Monteiro (the historic company), Chaussy, Nova, CTI, SECOMOC, ECCR, Maten Métrologie, Prose, DB POWER, Altitude TS, Alliages, and Efinor, each contributing specialized expertise to the group's integrated service offering.

Differentiator

Problem solved

Functional benefit

Products and services

• Contracting (EPCI and Nuclear New Build) Full-service EPCI (Engineering, Procurement, Construction, Installation) contracting for new nuclear build projects and export markets, combining advanced engineering, strategic procurement, custom construction, and optimal installation.
• Reactor Maintenance and Operation Services Integrated engineering, fabrication, maintenance, and innovation services for the operating nuclear reactor fleet, including preventive and corrective maintenance and modifications to existing installations.
• Industrie & Process Services Industrial project and maintenance services for process industries, research, defense, and naval sectors, covering design, fabrication, installation, and maintenance of complex systems.
• Boiler-Making Fabrication and Construction Design, fabrication, installation, and repair of boiler-made equipment and pressure equipment with high added value or for complex environments, including tanks and storage facilities.
• Precision Machining (Usinage) Precision machining services for complex mechanical parts with strict tolerances, covering turning, milling, and boring operations for critical sectors including energy, nuclear, pharmaceutical, and food processing.
• On-Site and Workshop Maintenance Maintenance services combining workshop and on-site interventions for mechanical organs, both static and dynamic, delivered by qualified teams with advanced equipment.
• Non-Destructive Testing (CND/END) Complete non-destructive testing services to ensure industrial equipment integrity and compliance with strictest standards, performed in workshops and on client sites.
• Metrology Services Volume measurement and tank, cistern, and reservoir gauging services dedicated to ensuring conformity with current standards and regulations, including dimensional control, verticality, roundness measurements, and retention basin surveys.
• Technical Assistance Complete range of technical assistance services dedicated to supporting companies in their industrial projects, including method engineering, inspection, quality, and commissioning support.
• Industrial Valves (Robinetterie) Industrial valve expertise including design, installation, and maintenance for controlling industrial fluids including gaseous, liquid, cryogenic, and pressurized, serving energy, chemical, steel, and industrial gas sectors.
• Mechanical Assembly Services Mechanical assembly services from design to installation and maintenance of reliable, high-performance equipment, working closely with machining, welding, and boiler-making workshops.
• Vibration Analysis and Balancing Vibration analysis and balancing services for rotating equipment to anticipate failures, ensure machine reliability, and extend installation lifespan, delivered in workshop or on-site.
• Special Machines Custom rotating machines and equipment design, realization, and optimization services for the most complex industrial sector requirements, covering diagnostics to complete installation.
• Multi-Service Cleaning (Propreté Multiservices) Comprehensive multi-service cleaning offering for industrial, administrative, and heritage environments, including assistance, reception, heritage maintenance, locksmithing, and green space management.
• Access Equipment Setup (Scaffolding and Rope Work) Turnkey and custom scaffolding and rope work solutions for complex and constrained nuclear installation environments, ensuring worker safety and operational performance.
• Nuclear Waste Treatment Nuclear waste management services including processing, sorting, conditioning, and tracking, ensuring responsible and optimized waste management compliant with operator and regulatory standards.
• Decontamination and Dismantling Decontamination and dismantling operations for the French nuclear park, deploying recognized expertise on civil and nuclear sites, including highly activated (HA) or ALPHA controlled zones.
• Radioprotection and Safety Assistance Radioprotection, safety, and risk management assistance services for nuclear sites, providing surveillance, analysis, consulting, and operational management by specialized technicians and engineers.
• Industrial and Nuclear Logistics Industrial and nuclear logistics services for construction site support, operations, and exploitation in the most constrained industrial and nuclear environments in France and internationally.

Quantifiable outcome

• Single-source accountability reduces coordination complexity for multi-disciplinary industrial projects
• +2 more outcomes

Named customers10 records

Segments8 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

One partnership is on record.

• Fabtech GroupcoreStrategic or Co-development Partner · 1 January 2025Strategic industrial partnership established in 2025 with Fabtech Group based in the United Arab Emirates. This partnership enables Groupe M to expand into Middle East markets and pursue industrial projects in the UAE region, combining Fabtech Group's local presence with Groupe M's technical expertise in complex industrial projects.

Scale indicators4 records

Recent moves8 records

Expansion highlights6 records

Direct peers

• Assystem: French independent engineering group specialized in complex industrial and nuclear infrastructure, including engineering, project management and digital twin services. Comparable to Groupe M's NOVA engineering and ECCR design-office activities.
• Onet Technologies: French industrial-services group with a major nuclear engineering, dismantling and maintenance division serving EDF, CEA and Orano. Directly comparable to Groupe M's nuclear Contracting, Réacteurs and Facility Management activities, and a historical competitor for the same welding and boiler-making scopes.
• Altrad: European industrial services group providing scaffolding, access solutions, mechanical services and rotating-equipment maintenance to energy and process clients. Comparable to Groupe M's Altitude TS, scaffolding and rotating-machinery offerings across nuclear and process industries.
• Nuvia (Engie Solutions): Specialist nuclear-services subsidiary of Engie offering radioprotection, decommissioning, waste treatment and facility management for nuclear sites. Closely overlaps with Groupe M's Prose FM, radioprotection, decontamination/dismantling and waste-treatment divisions.
• Framatome: EDF-controlled nuclear reactor and services company providing maintenance, modification and outage support across the French fleet. Competes with Groupe M on reactor maintenance scopes, modification projects (e.g., corrosion-under-constraint programs) and EPR2 build-out work, while also being a client on some scopes.
• Endel (Engie Solutions): Industrial maintenance and mechanical-services provider for nuclear, energy, defense and naval clients. Overlaps with Groupe M's maintenance, mechanical-assembly and special-machines offerings, particularly via the Alliages Énergie and DB Power scope.

Broad incumbents

• Bouygues Construction (Nuclear / Industry): Major French construction group with a dedicated nuclear and industrial-process division (including ex-DTP terrassement). Competes with Groupe M on large industrial EPC, nuclear new-build and process-plant construction scopes.
• SPIE: Major listed French multi-technical services group with nuclear, industrial and energy divisions. While broader and more diversified than Groupe M, SPIE Nuclear overlaps directly with piping, mechanical and maintenance scopes for EDF and CEA.
• Eiffage Énergie Systèmes: Industrial-services arm of Eiffage Group providing electrical, mechanical and nuclear services. Overlaps with Groupe M's instrumentation, electrical and mechanical scopes in nuclear and process industries.
• Vinci Energies: Large French industrial-services and electrical-infrastructure group operating across nuclear, energy, defense and process industries. Competes with Groupe M on nuclear, defense and energy projects but as part of a much broader portfolio.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks7 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/groupe-m-france

Compliance12 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles3 records

Subsidiaries16 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Groupe M