# List of professional services firms in Normandy

Tamtam tracks 114 professional services firms headquartered in Normandy. This list ranks the 50 largest by number of employees on LinkedIn, led by Cerfrance Alliance Centre, CBRE France and CNPP. Their median headcount is 78. Half of them were founded in 1999 or later. The most common headquarters are Rouen (9), Caen (5) and Le Havre (3).

These professional services firms in Normandy include mostly mid-sized companies. The commonest activities are accounting and business consulting, alongside engineering services and IT. Many companies are headquartered in Normandy, with a few in Paris.

Among them, Cerfrance Alliance Centre provides accounting and business management support. CNPP develops risk prevention solutions including cybersecurity. Alpha Maintenance specializes in the oil and energy sector. AntemetA offers expertise in IT infrastructure, cloud computing, and cybersecurity.

🇫🇷 Normandy · 50 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Cerfrance Alliance Centre](https://www.tamtam.ai/c/cerfrance-alliance-centre) (alliancecentre.fr)<br>Provides accounting expertise and business management support to twelve thousand clients across five departments, focusing on sustainable daily performance for entrepreneurs. | Accounting | 🇫🇷 Saint Jean De La Ruelle | 790 | 2007 |
| 2 | [CBRE France](https://www.tamtam.ai/c/cbre-france) (cbre.fr)<br>Offers global corporate real estate advice and services, including sales, leasing, and management of various property types, assisting businesses with their real estate projects. | Real Estate | 🇫🇷 Paris | 685 | 1969 |
| 3 | [CNPP](https://www.tamtam.ai/c/cnpp) (cnpp.com)<br>Develops risk prevention solutions, including cybersecurity, safety, climate, occupational health, fire, explosion, and crisis management, through consulting, training, testing, inspection, certification, and publishing. | Security and Investigations | 🇫🇷 Saint Marcel | 601 | 1987 |
| 4 | [Ceacom](https://www.tamtam.ai/c/ceacom) (normandie.ceacom.fr)<br>A customer relationship management company based in Le Havre, offering advisory and service jobs, actively involved in professional insertion networks and local events | Business Consulting and Services | 🇫🇷 Le Havre | 521 | 2006 |
| 5 | [Talenz Alteis](https://www.tamtam.ai/c/talenz-alteis) (talenz.fr)<br>Independent firm providing accounting, audit, legal, social, HR, tax optimization, digital solutions, and wealth management services to business leaders. | Accounting | 🇫🇷 Caen | 400 |  |
| 6 | [CERAP](https://www.tamtam.ai/c/cerap) (cerap.fr)<br>Expert in nuclear risk prevention, supports clients with advice, studies, technical assistance for radiation protection, health, safety, and environmental concerns across various sectors. | Business Consulting and Services | 🇫🇷 Octeville | 369 | 1988 |
| 7 | [Alpha Maintenance](https://www.tamtam.ai/c/alpha-maintenance) (alpha.fr)<br>Company specializing in oil and energy sector, providing services and solutions based in Port-de-Bouc, France. | Engineering Services | 🇫🇷 Rouen | 333 | 1986 |
| 8 | [AntemetA](https://www.tamtam.ai/c/antemeta) (antemeta.fr)<br>French SME, expertise in IT infrastructure, cloud computing, and cybersecurity since 1995. They help companies transform their information systems. | IT Services and IT Consulting | 🇫🇷 Guyancourt | 310 | 1995 |
| 9 | [Voxens](https://www.tamtam.ai/c/voxens) (voxens.fr)<br>Manages multichannel call center operations for telephone marketing, focusing on customer acquisition, loyalty, retention, and reactivation for both B2B and B2C clients. | Outsourcing and Offshoring Consulting | 🇫🇷 Rouen | 227 | 2009 |
| 10 | [BHN](https://www.tamtam.ai/c/bhn) (bhn-expertise.com)<br>Seven offices in Normandy and Île-de-France providing accounting, audit, tax, social, and wealth management services to diverse businesses. | Accounting | 🇫🇷 Normandie | 198 | 2011 |
| 11 | [SOCAPS](https://www.tamtam.ai/c/socaps) (socaps.coop)<br>Global leader in technical assistance and consulting services for various industries worldwide, focusing on skills development, ecological transition, and societal innovations | Engineering Services | 🇫🇷 Rouen | 189 | 1999 |
| 12 | [DIDAXIS](https://www.tamtam.ai/c/didaxis) (didaxis.fr)<br>Leading payroll solutions provider, enabling entrepreneurship for various professions and skills, supporting 10,000 talents across 54 countries with 100,000 missions. | Business Consulting and Services | 🇫🇷 Paris | 180 | 2004 |
| 13 | [APAVE NDT (Non Destructive Testing)](https://www.tamtam.ai/c/apave-ndt-non-destructive-testing) (apave.com)<br>Specialized in non-destructive testing, inspections, and technical assistance, offering expertise in ensuring safety and quality in various industries | Business Consulting and Services | 🇫🇷 Saint-Marcel | 166 |  |
| 14 | [SOFICOM Walter France](https://www.tamtam.ai/c/soficom-walter-france) (soficom-walterfrance.com)<br>A leading independent firm in Normandy offering accounting, audit, payroll, legal, and tax services to SMEs and large corporations in various sectors | Accounting | 🇫🇷 Caen | 149 | 1968 |
| 15 | [Cerfrance Orne](https://www.tamtam.ai/c/cerfrance-orne) (orne.cerfrance.fr)<br>Cerfrance is a network of accounting and consulting experts serving 3,500 entrepreneurs across various sectors with personalized guidance for success | Accounting | 🇫🇷 Alençon | 146 | 1956 |
| 16 | [Masselin Energie](https://www.tamtam.ai/c/masselin-energie) (masselin-energie.fr)<br>Specializing in electrical and HVAC engineering, MASSELIN Energie offers innovative solutions for buildings, focusing on digitalization, energy efficiency, and sustainability | Facilities Services | 🇫🇷 Ifs | 143 | 1924 |
| 17 | [Artemys Normandie (groupe Artemys)](https://www.tamtam.ai/c/artemys-normandie-groupe-artemys) (groupeartemys.com)<br>The company offers a range of digital transformation services, with a focus on infrastructure, Cloud, BI, cybersecurity, and IT project management | IT Services and IT Consulting | 🇫🇷 Isneauville | 135 |  |
| 18 | [GH Connective \| B Corp](https://www.tamtam.ai/c/gh-connective-b-corp) (ghconnective.com)<br>This operational consulting firm assists businesses with optimization and transformation projects, covering quality, product development, supply chain, continuous improvement, and management control. | Business Consulting and Services | 🇫🇷 Le Havre | 119 | 2015 |
| 19 | [Groupe DEC, Diagnostic Expertise Conseil](https://www.tamtam.ai/c/groupe-dec-diagnostic-expertise-conseil) (groupe-dec.fr)<br>A group of specialists providing tailored solutions in Accounting, Audit, Legal, and IT services across multiple locations in France | Accounting | 🇫🇷 Mont-Saint-Aignan | 106 | 1990 |
| 20 | [Agileva](https://www.tamtam.ai/c/agileva) (agileva.fr)<br>Agileva has been serving small and medium-sized businesses for over 50 years, providing expertise in accounting and a wide range of associated services | Accounting | 🇫🇷 Caen | 106 | 1980 |
| 21 | [VIRIA](https://www.tamtam.ai/c/viria) (viria.fr)<br>Energy efficiency services for buildings, including energy management, equipment maintenance, installation, and environmental compliance solutions across various fuel types. | Environmental Services | 🇫🇷 Caen | 92 | 1963 |
| 22 | [Helpevia](https://www.tamtam.ai/c/helpevia) (helpevia.fr)<br>A team of 70 specialists supports private healthcare facilities in optimizing their purchasing processes through tailored advice and cost-effective solutions | Hospitals and Health Care | 🇫🇷 Rouen | 91 | 1980 |
| 23 | [Nextep hr](https://www.tamtam.ai/c/nextep-hr) (dominoconsulting.fr)<br>Specialized recruitment and direct approach for various companies, from small businesses to large groups, across diverse sectors for CDD, CDI, and temporary work. | Staffing and Recruiting | 🇫🇷 Rouen | 86 | 2013 |
| 24 | [GSF NEPTUNE OUEST](https://www.tamtam.ai/c/gsf-neptune-ouest) (gsf.fr)<br>A leading provider of cleanliness and associated services with a focus on human values and professionalism, operating internationally | Environmental Services | 🇫🇷 Caen | 84 | 2020 |
| 25 | [Izi Solutions Habitat, Groupe EDF](https://www.tamtam.ai/c/izi-solutions-habitat-groupe-edf) (les-eco-isolateurs.com)<br>Provides comprehensive home energy renovation services including insulation, heat pumps, and ventilation with digital simplicity and expert human support. | Construction | 🇫🇷 Évreux | 78 | 2010 |
| 26 | [Parangon Patrimoine](https://www.tamtam.ai/c/parangon-patrimoine) (parangon-patrimoine.fr)<br>Parangon Patrimoine offers personalized financial solutions to clients, focusing on tax reduction, investment profitability, and optimal financing, seeking individuals with sales skills and a desire for professional growth | Investment Management | 🇫🇷 Deauville | 67 | 2001 |
| 27 | [ELITT](https://www.tamtam.ai/c/elitt) (elitt.com)<br>A B-to-B service company specializing in secure electronic transactions, offering expertise in evaluation, consultancy, and audit for various industries | Banking | 🇫🇷 Colombelles | 66 | 2008 |
| 28 | [ATAUB Architectes](https://www.tamtam.ai/c/ataub-architectes) (ataub.fr)<br>A dynamic agency with 50+ years experience providing reliable and rigorous architectural services globally, embracing modernization while upholding core values | Architecture and Planning | 🇫🇷 Bois-Guillaume Rouen | 63 | 1966 |
| 29 | [Semafor](https://www.tamtam.ai/c/semafor) (semafor.fr)<br>A Human Wealth consultancy with over 25 years of experience, emphasizing that employees are more than just a resource for businesses | Business Consulting and Services | 🇫🇷 Rouen | 55 | 1996 |
| 30 | [IAD Informatique](https://www.tamtam.ai/c/iad-informatique) (iad-bat.com)<br>Specializing in distributing tailored IT solutions for the construction industry since 1989, including SAGE BATIGEST, SAGE COMPTABILITE, and CODIAL | Software Development | 🇫🇷 Acquigny | 55 | 1989 |
| 31 | [DESIGN BOX](https://www.tamtam.ai/c/design-box) (db-structures.com)<br>Design Box provides excellent structural design services to clients, architects, and contractors, utilizing their in-depth theoretical and practical expertise in material science | Construction | 🇫🇷 Rouen | 49 | 2009 |
| 32 | [DEVOLIS](https://www.tamtam.ai/c/devolis) (devolis.com)<br>DEVOLIS is a certified Microsoft partner offering tailored solutions for cloud migration, collaborative tools, app development, Big Data integration, and intelligent bots | IT Services and IT Consulting | 🇫🇷 Le Petit-Quevilly | 49 | 2007 |
| 33 | [NEWTON EXPERTISE](https://www.tamtam.ai/c/newton-expertise) (newtonexpertise.com)<br>NEWTON Expertise is a 40-person company based in Mont-Saint-Aignan, offering expertise in accounting, audit, legal services, and business support for all stages of company life | Accounting | 🇫🇷 Mont-Saint-Aignan | 47 | 1945 |
| 34 | [Docaposte Agility](https://www.tamtam.ai/c/docaposte-agility) (docaposte-agility.fr)<br>Consulting firm driving agile and digital transformation for businesses Specializing in productivity enhancement and change success through tailored solutions and expertise | IT Services and IT Consulting | 🇫🇷 Sotteville-lès-Rouen | 45 | 2011 |
| 35 | [TOPO ETUDES](https://www.tamtam.ai/c/topo-etudes) (topo-etudes.fr)<br>Specialized in aerial and underground energy distribution network design, topography, mapping, GIS, and non-collective sanitation system studies nationwide. | Research Services | 🇫🇷 Lisieux | 45 | 1990 |
| 36 | [REDLab](https://www.tamtam.ai/c/redlab) (redlab.io)<br>REDLab transforms raw data into valuable insights for businesses, offering tailored solutions to enhance operational efficiency, risk management, and customer experience through data analysis | IT Services and IT Consulting | 🇫🇷 Le Petit-Quevilly | 42 | 2017 |
| 37 | [AZNETWORK](https://www.tamtam.ai/c/aznetwork) (aznetwork.eu)<br>The company specializes in integrating enterprise solutions to optimize logistical flows, developing components, and providing data center services for improved security | IT Services and IT Consulting | 🇫🇷 Alençon | 41 | 1999 |
| 38 | [Actemium Le Havre Process Control](https://www.tamtam.ai/c/actemium-le-havre-process-control) (actemium.fr)<br>Specializing in project management, automation, and industrial IT solutions, we enhance efficiency for industrial partners through process expertise and custom software solutions | Automation Machinery Manufacturing | 🇫🇷 Port-Jérôme-sur-Seine | 34 | 1981 |
| 39 | [Groupe 6NAPSE](https://www.tamtam.ai/c/groupe-6napse) (6-napse.com)<br>Engineering expertise providing numerical simulation, qualification tests, material analysis, and failure expertise for industrial sectors like aeronautics, automotive, and medical device development. | Engineering Services | 🇫🇷 Val-de-Reuil | 30 |  |
| 40 | [ATELIER LD](https://www.tamtam.ai/c/atelier-ld) (atelierld.com)<br>Innovative urban planning solutions with a multidisciplinary team of engineers, landscapers, urban planners, and architects focusing on environmental quality and user benefit | Architecture and Planning | 🇫🇷 Bois-Guillaume | 30 | 2006 |
| 41 | [ACE Service](https://www.tamtam.ai/c/ace-service) (attineos.com)<br>Established in 2001, this company specializes in information systems security, with a focus on proactive monitoring and technological innovation for clients | Computer and Network Security | 🇫🇷 Rouen | 30 | 2001 |
| 42 | [FeelAgile](https://www.tamtam.ai/c/feelagile) (feelagile.com)<br>Provider of simple, reliable, and automated cybersecurity certification solutions for SMEs, TPEs, and Startups Offering global cybersecurity solutions to meet market standards | Computer and Network Security | 🇫🇷 Paris | 29 | 2007 |
| 43 | [FIDUTECH CONSEILS](https://www.tamtam.ai/c/fidutech-conseils) (fidutech-conseils.fr)<br>FIDUTECH CONSEILS supports entrepreneurs with personalized services in accounting, tax, legal, and wealth management, primarily in the Caen region and Normandy | Accounting | 🇫🇷 Fleury-sur-Orne | 28 | 1993 |
| 44 | [CAP EXPERTISE](https://www.tamtam.ai/c/cap-expertise)<br>A company located in Le Petit Quevilly offering expertise services in an unspecified field | Accounting | 🇫🇷 Le Petit-Quevilly | 28 | 2007 |
| 45 | [Cabinet BLOIS](https://www.tamtam.ai/c/cabinet-blois) (bloisaudit.fr)<br>Accounting firm with locations in Évreux, Vernon, Louviers, Le Neubourg, Etrepagny, Gaillon, Nice, and Grasse Family-owned with 65 employees focused on local economy | Accounting | 🇫🇷 Évreux | 27 |  |
| 46 | [S&you France](https://www.tamtam.ai/c/s-and-you-france) (sandyou.fr)<br>International recruitment firm specialized in expert and executive roles. Consultants provide expertise across business, technical, and support sectors, fostering trust with candidates and clients. | Staffing and Recruiting | 🇫🇷 Boulogne Billancourt | 26 | 2018 |
| 47 | [ABEXE](https://www.tamtam.ai/c/abexe) (bizouard.com)<br>An accounting firm located in Le Havre, France, specializing in providing financial services and support to businesses and individuals | Accounting | 🇫🇷 Le Havre | 26 | 2006 |
| 48 | [CDH EXTENSE](https://www.tamtam.ai/c/cdh-extense) (cdhexpertises.com)<br>Expertise, consulting, and training company specializing in agri-food, environmental, health, animal production, and agriculture risk management Trusted partner for insurance and businesses worldwide | Insurance | 🇫🇷 Bierville | 25 | 1999 |
| 49 | [Cabinet Longuemart Conseils et Associés](https://www.tamtam.ai/c/cabinet-longuemart-conseils-et-associes) (cab-longuemart.fr)<br>A team of two chartered accountants and 20 staff in downtown Rouen offer accounting, auditing, legal services, and business support | Accounting | 🇫🇷 Rouen | 25 | 1926 |
| 50 | [SFPN - Cabinet d'expertise comptable](https://www.tamtam.ai/c/sfpn-cabinet-d-expertise-comptable) (sfpn-expert-comptable-bayeux.fr)<br>SFPN is a dynamic team providing accounting, tax, legal services, and assistance with funding, budgeting, and legal structure selection for various businesses | Accounting | 🇫🇷 Bayeux | 25 | 1975 |

## How this list is built

Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 11, 2026.

## More company lists in Normandy

- [The largest companies in Normandy](https://www.tamtam.ai/l/largest-companies-normandy) (2,380)
- [Manufacturers in Normandy](https://www.tamtam.ai/l/manufacturers-normandy) (245)
- [Retail chains in Normandy](https://www.tamtam.ai/l/retail-chains-normandy) (244)
- [Companies with in-house R&D in Normandy](https://www.tamtam.ai/l/r-and-d-companies-normandy) (227)
- [Multinational companies in Normandy](https://www.tamtam.ai/l/multinational-companies-normandy) (216)
- [Public sector organisations in Normandy](https://www.tamtam.ai/l/public-sector-organisations-normandy) (166)
- [Hardware manufacturers in Normandy](https://www.tamtam.ai/l/hardware-companies-normandy) (135)
- [Family-owned companies in Normandy](https://www.tamtam.ai/l/family-owned-companies-normandy) (135)
- [Distributors and wholesalers in Normandy](https://www.tamtam.ai/l/distributors-and-wholesalers-normandy) (128)
- [Critical infrastructure operators in Normandy](https://www.tamtam.ai/l/critical-infrastructure-operators-normandy) (103)
- [Contract manufacturers in Normandy](https://www.tamtam.ai/l/contract-manufacturers-normandy) (101)
- [Education providers in Normandy](https://www.tamtam.ai/l/education-companies-normandy) (100)
- [Government Administration companies in Normandy](https://www.tamtam.ai/l/government-administration-companies-normandy) (93)
- [Construction companies in Normandy](https://www.tamtam.ai/l/construction-companies-normandy) (92)
- [Industrial Machinery Manufacturing companies in Normandy](https://www.tamtam.ai/l/industrial-machinery-manufacturing-companies-normandy) (81)
- [Healthcare providers in Normandy](https://www.tamtam.ai/l/healthcare-providers-normandy) (80)
- [Food and Beverage Manufacturing companies in Normandy](https://www.tamtam.ai/l/food-and-beverage-manufacturing-companies-normandy) (77)
- [IT services companies in Normandy](https://www.tamtam.ai/l/it-services-companies-normandy) (77)
- [Retail companies in Normandy](https://www.tamtam.ai/l/retail-companies-normandy) (75)
- [Real Estate companies in Normandy](https://www.tamtam.ai/l/real-estate-companies-normandy) (68)
- [IT Services and IT Consulting companies in Normandy](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-normandy) (65)
- [Logistics companies in Normandy](https://www.tamtam.ai/l/logistics-companies-normandy) (65)
- [Events Services companies in Normandy](https://www.tamtam.ai/l/events-services-companies-normandy) (62)
- [Software Development companies in Normandy](https://www.tamtam.ai/l/software-development-companies-normandy) (60)

## The same list elsewhere in France

- [Professional services firms in France](https://www.tamtam.ai/l/professional-services-firms-france) (6,611)
- [Professional services firms in Île-de-France](https://www.tamtam.ai/l/professional-services-firms-ile-de-france) (3,377)
- [Professional services firms in Auvergne-Rhône-Alpes](https://www.tamtam.ai/l/professional-services-firms-auvergne-rhone-alpes) (711)
- [Professional services firms in the Hauts-de-Seine department](https://www.tamtam.ai/l/professional-services-firms-hauts-de-seine) (629)
- [Professional services firms in Provence-Alpes-Côte d'Azur](https://www.tamtam.ai/l/professional-services-firms-provence-alpes-cote-dazur) (433)
- [Professional services firms in the Rhône department](https://www.tamtam.ai/l/professional-services-firms-rhone) (400)
- [Professional services firms in Occitanie](https://www.tamtam.ai/l/professional-services-firms-occitanie) (399)
- [Professional services firms in Grand Est](https://www.tamtam.ai/l/professional-services-firms-grand-est) (316)
- [Professional services firms in Nouvelle-Aquitaine](https://www.tamtam.ai/l/professional-services-firms-nouvelle-aquitaine) (308)
- [Professional services firms in Hauts-de-France](https://www.tamtam.ai/l/professional-services-firms-hauts-de-france) (260)
- [Professional services firms in Pays de la Loire](https://www.tamtam.ai/l/professional-services-firms-pays-de-la-loire) (254)
- [Professional services firms in the Bouches-du-Rhône department](https://www.tamtam.ai/l/professional-services-firms-bouches-du-rhone) (249)
- [Professional services firms in the Haute-Garonne department](https://www.tamtam.ai/l/professional-services-firms-haute-garonne) (208)
- [Professional services firms in the Nord department](https://www.tamtam.ai/l/professional-services-firms-nord) (178)
- [Professional services firms in Brittany](https://www.tamtam.ai/l/professional-services-firms-brittany) (167)
- [Professional services firms in the Loire-Atlantique department](https://www.tamtam.ai/l/professional-services-firms-loire-atlantique) (158)
- [Professional services firms in the Gironde department](https://www.tamtam.ai/l/professional-services-firms-gironde) (151)
- [Professional services firms in the Yvelines department](https://www.tamtam.ai/l/professional-services-firms-yvelines) (108)
- [Professional services firms in the Ille-et-Vilaine department](https://www.tamtam.ai/l/professional-services-firms-ille-et-vilaine) (94)
- [Professional services firms in Paris](https://www.tamtam.ai/l/professional-services-firms-paris) (2,241)
- [Professional services firms in Lyon](https://www.tamtam.ai/l/professional-services-firms-lyon) (265)
- [Professional services firms in Toulouse](https://www.tamtam.ai/l/professional-services-firms-toulouse) (139)
- [Professional services firms in Marseille](https://www.tamtam.ai/l/professional-services-firms-marseille) (123)
- [Professional services firms in Boulogne-Billancourt](https://www.tamtam.ai/l/professional-services-firms-boulogne-billancourt) (102)

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Source: https://www.tamtam.ai/l/professional-services-firms-normandy