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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).

馃嚝馃嚪 Normandy50 companiesUpdated Nov 11, 2026

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.

#CompanyIndustryHeadquarters EmployeesFounded
1
Cerfrance Alliance Centrealliancecentre.fr

Provides accounting expertise and business management support to twelve thousand clients across five departments, focusing on sustainable daily performance for entrepreneurs.

Accounting 馃嚝馃嚪 Saint Jean De La Ruelle 790 2007
2
CBRE Francecbre.fr

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 馃嚝馃嚪 Paris 685 1969
3
CNPPcnpp.com

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 馃嚝馃嚪 Saint Marcel 601 1987
4
Ceacomnormandie.ceacom.fr

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 馃嚝馃嚪 Le Havre 521 2006
5
Talenz Alteistalenz.fr

Independent firm providing accounting, audit, legal, social, HR, tax optimization, digital solutions, and wealth management services to business leaders.

Accounting 馃嚝馃嚪 Caen 400 n/a
6
CERAPcerap.fr

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 馃嚝馃嚪 Octeville 369 1988
7
Alpha Maintenancealpha.fr

Company specializing in oil and energy sector, providing services and solutions based in Port-de-Bouc, France.

Engineering Services 馃嚝馃嚪 Rouen 333 1986
8
AntemetAantemeta.fr

French SME, expertise in IT infrastructure, cloud computing, and cybersecurity since 1995. They help companies transform their information systems.

IT Services and IT Consulting 馃嚝馃嚪 Guyancourt 310 1995
9
Voxensvoxens.fr

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 馃嚝馃嚪 Rouen 227 2009
10
BHNbhn-expertise.com

Seven offices in Normandy and 脦le-de-France providing accounting, audit, tax, social, and wealth management services to diverse businesses.

Accounting 馃嚝馃嚪 Normandie 198 2011
11
SOCAPSsocaps.coop

Global leader in technical assistance and consulting services for various industries worldwide, focusing on skills development, ecological transition, and societal innovations

Engineering Services 馃嚝馃嚪 Rouen 189 1999
12
DIDAXISdidaxis.fr

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 馃嚝馃嚪 Paris 180 2004
13
APAVE NDT (Non Destructive Testing)apave.com

Specialized in non-destructive testing, inspections, and technical assistance, offering expertise in ensuring safety and quality in various industries

Business Consulting and Services 馃嚝馃嚪 Saint-Marcel 166 n/a
14
SOFICOM Walter Francesoficom-walterfrance.com

A leading independent firm in Normandy offering accounting, audit, payroll, legal, and tax services to SMEs and large corporations in various sectors

Accounting 馃嚝馃嚪 Caen 149 1968
15
Cerfrance Orneorne.cerfrance.fr

Cerfrance is a network of accounting and consulting experts serving 3,500 entrepreneurs across various sectors with personalized guidance for success

Accounting 馃嚝馃嚪 Alen莽on 146 1956
16
Masselin Energiemasselin-energie.fr

Specializing in electrical and HVAC engineering, MASSELIN Energie offers innovative solutions for buildings, focusing on digitalization, energy efficiency, and sustainability

Facilities Services 馃嚝馃嚪 Ifs 143 1924
17
Artemys Normandie (groupe Artemys)groupeartemys.com

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 馃嚝馃嚪 Isneauville 135 n/a
18
GH Connective | B Corpghconnective.com

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 馃嚝馃嚪 Le Havre 119 2015
19
Groupe DEC, Diagnostic Expertise Conseilgroupe-dec.fr

A group of specialists providing tailored solutions in Accounting, Audit, Legal, and IT services across multiple locations in France

Accounting 馃嚝馃嚪 Mont-Saint-Aignan 106 1990
20
Agilevaagileva.fr

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 馃嚝馃嚪 Caen 106 1980
21
VIRIAviria.fr

Energy efficiency services for buildings, including energy management, equipment maintenance, installation, and environmental compliance solutions across various fuel types.

Environmental Services 馃嚝馃嚪 Caen 92 1963
22
Helpeviahelpevia.fr

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 馃嚝馃嚪 Rouen 91 1980
23
Nextep hrdominoconsulting.fr

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 馃嚝馃嚪 Rouen 86 2013
24
GSF NEPTUNE OUESTgsf.fr

A leading provider of cleanliness and associated services with a focus on human values and professionalism, operating internationally

Environmental Services 馃嚝馃嚪 Caen 84 2020
25
Izi Solutions Habitat, Groupe EDFles-eco-isolateurs.com

Provides comprehensive home energy renovation services including insulation, heat pumps, and ventilation with digital simplicity and expert human support.

Construction 馃嚝馃嚪 脡vreux 78 2010

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26
Parangon Patrimoineparangon-patrimoine.fr

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 馃嚝馃嚪 Deauville 67 2001
27
ELITTelitt.com

A B-to-B service company specializing in secure electronic transactions, offering expertise in evaluation, consultancy, and audit for various industries

Banking 馃嚝馃嚪 Colombelles 66 2008
28
ATAUB Architectesataub.fr

A dynamic agency with 50+ years experience providing reliable and rigorous architectural services globally, embracing modernization while upholding core values

Architecture and Planning 馃嚝馃嚪 Bois-Guillaume Rouen 63 1966
29
Semaforsemafor.fr

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 馃嚝馃嚪 Rouen 55 1996
30
IAD Informatiqueiad-bat.com

Specializing in distributing tailored IT solutions for the construction industry since 1989, including SAGE BATIGEST, SAGE COMPTABILITE, and CODIAL

Software Development 馃嚝馃嚪 Acquigny 55 1989
31
DESIGN BOXdb-structures.com

Design Box provides excellent structural design services to clients, architects, and contractors, utilizing their in-depth theoretical and practical expertise in material science

Construction 馃嚝馃嚪 Rouen 49 2009
32
DEVOLISdevolis.com

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 馃嚝馃嚪 Le Petit-Quevilly 49 2007
33
NEWTON EXPERTISEnewtonexpertise.com

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 馃嚝馃嚪 Mont-Saint-Aignan 47 1945
34
Docaposte Agilitydocaposte-agility.fr

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 馃嚝馃嚪 Sotteville-l猫s-Rouen 45 2011
35
TOPO ETUDEStopo-etudes.fr

Specialized in aerial and underground energy distribution network design, topography, mapping, GIS, and non-collective sanitation system studies nationwide.

Research Services 馃嚝馃嚪 Lisieux 45 1990
36
REDLabredlab.io

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 馃嚝馃嚪 Le Petit-Quevilly 42 2017
37
AZNETWORKaznetwork.eu

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 馃嚝馃嚪 Alen莽on 41 1999
38
Actemium Le Havre Process Controlactemium.fr

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 馃嚝馃嚪 Port-J茅r么me-sur-Seine 34 1981
39
Groupe 6NAPSE6-napse.com

Engineering expertise providing numerical simulation, qualification tests, material analysis, and failure expertise for industrial sectors like aeronautics, automotive, and medical device development.

Engineering Services 馃嚝馃嚪 Val-de-Reuil 30 n/a
40
ATELIER LDatelierld.com

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 馃嚝馃嚪 Bois-Guillaume 30 2006
41
ACE Serviceattineos.com

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 馃嚝馃嚪 Rouen 30 2001
42
FeelAgilefeelagile.com

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 馃嚝馃嚪 Paris 29 2007
43
FIDUTECH CONSEILSfidutech-conseils.fr

FIDUTECH CONSEILS supports entrepreneurs with personalized services in accounting, tax, legal, and wealth management, primarily in the Caen region and Normandy

Accounting 馃嚝馃嚪 Fleury-sur-Orne 28 1993
44
CAP EXPERTISE

A company located in Le Petit Quevilly offering expertise services in an unspecified field

Accounting 馃嚝馃嚪 Le Petit-Quevilly 28 2007
45
Cabinet BLOISbloisaudit.fr

Accounting firm with locations in 脡vreux, Vernon, Louviers, Le Neubourg, Etrepagny, Gaillon, Nice, and Grasse Family-owned with 65 employees focused on local economy

Accounting 馃嚝馃嚪 脡vreux 27 n/a
46
S&you Francesandyou.fr

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 馃嚝馃嚪 Boulogne Billancourt 26 2018
47
ABEXEbizouard.com

An accounting firm located in Le Havre, France, specializing in providing financial services and support to businesses and individuals

Accounting 馃嚝馃嚪 Le Havre 26 2006
48
CDH EXTENSEcdhexpertises.com

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 馃嚝馃嚪 Bierville 25 1999
49
Cabinet Longuemart Conseils et Associ茅scab-longuemart.fr

A team of two chartered accountants and 20 staff in downtown Rouen offer accounting, auditing, legal services, and business support

Accounting 馃嚝馃嚪 Rouen 25 1926
50
SFPN - Cabinet d'expertise comptablesfpn-expert-comptable-bayeux.fr

SFPN is a dynamic team providing accounting, tax, legal services, and assistance with funding, budgeting, and legal structure selection for various businesses

Accounting 馃嚝馃嚪 Bayeux 25 1975

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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.

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