Assystem
Assystem is a French publicly-listed international engineering and digital services firm serving as Europe's largest independent nuclear engineering company, delivering full-lifecycle engineering, digital twin, and project management services to nuclear operators, defence agencies, and critical infrastructure clients across 12 countries.
- Company typePublic
- Founded1965
- HeadquartersParis, France
- Headcount5,001–10,000
- GTM typeB2B
- OfferingServices
What Assystem does
Assystem S.A. is a French-headquartered international engineering and digital services company founded in 1965 (per company_history firmographics lists 1966), publicly listed on Euronext Paris under ticker ASY, and self-described as Europe's largest independent nuclear engineering company with over 60 years of experience. The company operates across 12 countries and serves three core customer verticals: nuclear operators and developers (the primary segment), defence and security organisations, and critical infrastructure operators in energy, transport, and urban development. Major customers include Sellafield, EDF, Rolls-Royce Submarines, ITER, Orano, UKAEA, and AVEVA, with revenue anchored on multi-decade government framework contracts.
The company's offering is organised into three divisions: Engineering Services (siting, licensing, system engineering, construction management, nuclear safety, compliance); Digital Services (split into Augmented Engineering covering MBSE, PLM, digital twins, BIM/CAD, IoT, data platforms and AI, cloud, and cybersecurity, plus Digital Transformation covering application development, BI/analytics, and project management digitalisation); and Project & Programme Management (PMO, PMC, consulting). Notable proprietary digital products include DeepGIS (AI-powered territorial analysis for nuclear site selection), Scan to BIM (point cloud to digital model conversion), and Advanced Work Packaging (AWP) methodology. Partnerships with AVEVA, Frazer-Nash, AtkinsRéalis, Schneider Electric, and KEPCO Technology form a broader ecosystem around major software and engineering platforms.
Assystem generates revenue primarily through professional services delivered via long-term project contracts, framework agreements, and competitive tenders with sovereign and enterprise buyers. Nine-month 2025 revenue was €484.2 million (8.7% YoY growth), with international operations up 19.7%. Recent major contract wins include a £400 million Rolls-Royce Submarines AUKUS partnership, up to £500 million from the UK GCA CPS2 framework by 2030, and the Orano 'Aval du futur' program targeting the 2040s. FY2025 net income of €6.5 million was impacted by impairment charges and Middle East exposure warnings. The company has pursued inorganic growth via acquisitions of STUP Consultants (India, 2021, €21-22M), KEOPS Automation (France, 2024), and Mactech Energy Group (Jan 2025).
Assystem firmographics
Firmographics- Name
- Assystem
- Legal name
- Assystem S.A.
- Website
- https://assystem.com
- Company type
- Public
- Founded year
- 1965
- Operating status
- Operating
- Headcount range
- 5,001–10,000 employees
- Short description
- Assystem is a French publicly-listed international engineering and digital services firm serving as Europe's largest independent nuclear engineering company, delivering full-lifecycle engineering, digital twin, and project management services to nuclear operators, defence agencies, and critical infrastructure clients across 12 countries.
- Ownership category
- akta.pro rank
Assystem industry classification
Industry- Product category
- Nuclear Engineering Services
- NAICS
- Search, Detection, Navigation, Guidance, Aeronautical, and Nautical System and Instrument Manufacturing (334511), Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services (518210)
- SIC
- Guided Missiles & Space Vehicles & Parts (3760), General Industrial Machinery & Equipment (3560)
- akta.pro primary industry
- Enterprise Architecture & Technology Roadmapping (BPAEAAAC)
Keywords
Where Assystem is headquartered
LocationHeadquarters
- HQ city
- Paris
- HQ country
- France
- HQ region
- Europe
Offices5 records
Markets served
Assystem business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure
Revenue model
- Engineering Services: Professional engineering services delivered across the full project lifecycle of nuclear and critical infrastructure programs, including design, construction management, commissioning, and decommissioning. Revenue is generated through long-term project contracts, framework agreements, and consulting engagements.
Go-to-market motion1 record
Distribution channels4 records
Marketing channels4 records
Assystem product offering
Product offeringCore offering
Assystem is an international engineering and digital services firm that delivers full-lifecycle engineering, digital, and project management services for nuclear, defence, energy transition, and other critical infrastructure projects. The company operates through three divisions — Engineering Services (siting, licensing, system engineering, construction management, nuclear safety, compliance and quality), Digital Services (Augmented Engineering plus Digital Transformation), and Project & Programme Management (PMO, PMC, consulting) — serving operators and governments across Europe, Asia, the Middle East, and beyond.
Product overview
Assystem is an international engineering and digital services company operating as a unified platform with three core divisions: Engineering Services (covering siting, licensing, system engineering, construction management, nuclear safety, and quality/compliance), Digital Services (split into Augmented Engineering — including MBSE, PLM, digital twin, BIM & CAD, IoT, data platforms and AI, cloud, and cybersecurity — and Digital Transformation covering application development, BI & analytics, and project management digitalisation), and Project & Programme Management (PMO, PMC, and consulting). Specialised AI-enabled solutions including DeepGIS and Scan to BIM are delivered as modules within the digital portfolio, supporting the full lifecycle of nuclear, defence, energy transition, and critical infrastructure projects.
Differentiator
Problem solved
Functional benefit
Brands
- IncredibleWomen: A proactive, ambitious and concrete programme that seeks to promote professional equality, structured around raising awareness, recruiting, securing the loyalty of talents and helping women develop their careers. Launched in 2010.
Products and services
- Engineering Services
Quantifiable outcome
- Over 2.5 million engineering working hours delivered on EPR programs since 2000
- +3 more outcomes
Companies that use Assystem
Customer profileNamed customers8 records
Segments3 records
Ideal customer profiles3 records
Assystem technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
AI capability5 records
Feature4 records
Assystem partnerships and signals
Strategic signalPartnerships
Nine partnerships are on record, tiered core and minor.
- UK Government Commercial Agency (GCA)coreTier 1 partner on specialist Nuclear Lot 8 of the £3.5bn Government Commercial Agency (GCA) Construction Professional Services 2 (CPS2) framework. Framework contracts potentially reaching £500 million by 2030. Provides streamlined route for Sellafield and other nuclear licensed sites to access specialist services.
- AVEVAcoreStrategic partnership targeting France, United Kingdom, and the Netherlands to serve critical infrastructure operators in energy, nuclear, defence and essential services sectors. Combines AVEVA's industrial software with Assystem's engineering and operational technology integration capabilities. The partnership builds on a relationship that included an earlier memorandum of understanding signed three years ago and prior collaboration involving Schneider Electric.
- AtkinsRéaliscorePart of the £400 million Rolls-Royce Submarines multi-year agreement alongside Frazer-Nash and Assystem, supporting nuclear propulsion, engineering, and consulting services for submarine reactor projects.
- Rolls-Royce Submarinescore£400 million multi-year partnership with Rolls-Royce Submarines to support Britain's nuclear-powered submarine programs under AUKUS. The partnership strengthens the industrial base for the UK Royal Navy's future fleet under the SSN-AUKUS program. Assystem is collaborating with Frazer-Nash and AtkinsRéalis in the UK and internationally.
- Frazer-NashcorePart of the £400 million Rolls-Royce Submarines multi-year agreement alongside AtkinsRéalis and Assystem, supporting nuclear propulsion, engineering, and consulting services for submarine reactor projects.
- OranocoreThree new engineering partnership agreements signed with Ametra, Assystem, and Vulcain at the World Nuclear Exhibition in Paris, extending Orano's 'Aval du futur' program to modernize nuclear fuel processing and recycling facilities in France. The program targets commissioning in the early 2040s.
- AmetraminorEngineering partnership under Orano's 'Aval du futur' program for nuclear fuel processing and recycling facilities.
- VulcainminorEngineering partnership under Orano's 'Aval du futur' program for nuclear fuel processing and recycling facilities.
- KEPCO Technology (Korea Electric Power Technology)minorJoint venture partnership through which KEPCO Technology has been involved in the ITER project for 10 years, contributing to design, manufacturing, project management, and workforce training. Assystem (France) and Amentum (UK) are the other joint venture partners.
Scale indicators8 records
Recent moves6 records
Expansion highlights6 records
Assystem competitors and assessment
Company assessmentDirect peers
- Amentum: A direct peer in nuclear and defence engineering services, particularly in the UK. Amentum is the other major partner (alongside Assystem and KEPCO Technology) in the ITER construction management joint venture and competes on US/UK nuclear and defence programs.
- Mott MacDonald: A direct peer in engineering consulting for nuclear, energy, and critical infrastructure, with strong UK presence. Comparable in providing lifecycle engineering, project management, and digital services to nuclear operators and government clients.
- Framatome: A direct peer in nuclear engineering services and equipment across the full reactor lifecycle (new build, fuel, services, decommissioning). Framatome is a primary competitor to Assystem on EDF programs and the wider European nuclear engineering market.
- AtkinsRéalis: A direct peer in nuclear engineering services (CANDU reactor engineering, EDF framework participation, and co-partner with Assystem on the Rolls-Royce Submarines CASP). Comparable size and service mix spanning engineering, project management, and nuclear new build across the UK, France, and North America.
Broad incumbents
- AECOM: A broad incumbent in design, engineering, and program management for nuclear, defence, and critical infrastructure. Competes with Assystem on government and enterprise engineering services contracts in the UK, Europe, and globally.
- Bechtel: A broad incumbent in large-scale nuclear EPC and infrastructure delivery, historically involved in major US and UK nuclear programs. Competes with Assystem for prime and sub-tier roles on complex nuclear new-build megaprojects.
- WSP Global: A broad incumbent professional services firm in nuclear, energy, and infrastructure engineering, with growing nuclear advisory and engineering practices in the UK and Europe post its Wood E&I acquisition. Competes on consulting and engineering mandates.
- Capgemini Engineering: A broad incumbent in digital engineering and systems integration (formerly Altran), with nuclear, aerospace, and energy digital practices. Increasingly competes with Assystem's Digital Services division on digital twin, PLM, BIM, and systems integration mandates.
- Jacobs Solutions: A broad incumbent in critical infrastructure engineering, including significant nuclear and defence work (e.g., Sellafield, AUKUS support). Competes with Assystem on large UK and US nuclear/defence frameworks as a much larger, more diversified firm.
Regional players
- Arcadis: A European-headquartered engineering and design consultancy with nuclear and energy transition practices. Comparable business model and services mix, providing design, engineering, and project management across infrastructure and energy projects in Europe.
Market position
Strengths5 records
Weaknesses4 records
Competitive moat5 records
Key risks5 records
Key highlights6 records
Customer concentration
Assystem social profiles
Digital presenceAssystem financial estimates
Financial estimateRevenue estimate
Valuation estimate
Assystem leadership team
Management profileNumber of profiles
Profiles9 records
Assystem subsidiaries and ownership
Company hierarchySubsidiaries2 records
Assystem funding detail
Funding detailFunding overview
Funding rounds1 record
Investors1 record
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Assystem M&A and investment
M&A and investmentM&A17 records
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Assystem
What does Assystem do?
Assystem is an international engineering and digital services firm that delivers full-lifecycle engineering, digital, and project management services for nuclear, defence, energy transition, and other critical infrastructure projects. The company operates through three divisions — Engineering Services (siting, licensing, system engineering, construction management, nuclear safety, compliance and quality), Digital Services (Augmented Engineering plus Digital Transformation), and Project & Programme Management (PMO, PMC, consulting) — serving operators and governments across Europe, Asia, the Middle East, and beyond.
Is Assystem a public or private company?
Assystem is a public company. It is classified as public and is currently operating.
When was Assystem founded?
Assystem was founded in 1965. It employs 5,001 to 10,000 people.
Where is Assystem based?
Assystem is headquartered in Paris, France, in the Europe region.
How does Assystem make money?
One revenue line is on record: engineering Services.
Who are Assystem's main competitors?
Direct peers on record are Amentum, Mott MacDonald, Framatome and AtkinsRéalis. Broad incumbents are AECOM, Bechtel, WSP Global, Capgemini Engineering and Jacobs Solutions. Arcadis is listed as a regional player.
Does Assystem have an API?
No public API is recorded for Assystem.
What industry is Assystem in?
Assystem's product category is Nuclear Engineering Services. Its primary akta.pro industry code is BPAEAAAC, Enterprise Architecture & Technology Roadmapping. Its NAICS code is 334511 and its SIC code is 3760.