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26 leading consulting firms in the Seine-Maritime department

Tamtam tracks 26 consulting firms headquartered in the Seine-Maritime department. This list ranks all of them by number of employees on LinkedIn, led by SOCAPS, Artemys Normandie (groupe Artemys) and GH Connective | B Corp. Their median headcount is 27. Half of them were founded in 2007 or later. The most common headquarters are Le Havre (6), Rouen (5) and Mont-Saint-Aignan (2).

馃嚝馃嚪 Seine-Maritime26 companiesUpdated Nov 12, 2026

The consulting firms in Seine-Maritime include a mix of operational consulting, IT services, and specialized engineering. SOCAPS, the largest with 189 employees, provides technical assistance and consulting globally. Artemys Normandie focuses on digital transformation, while GH Connective assists with business optimization. Groupe DEC offers accounting, audit, and legal services, and Helpevia supports healthcare facilities in purchasing.

Most of these firms are mid-sized companies, with a significant number founded in the 2000s. There is a concentration of headquarters in Rouen, including SOCAPS, Helpevia, and Semafor, indicating a central hub for consulting activities in the department.

#CompanyIndustryHeadquarters EmployeesFounded
1
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
2
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
3
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
4
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
5
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
6
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
7
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
8
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
9
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
10
Enovea, votre partenaire logicielenovea.net

Develops digital projects like 3D configurators and ERP integration. Publishes software for real-time matching, data reconciliation, and connected object data analysis.

Software Development 馃嚝馃嚪 Mont-Saint-Aignan 42 2008
11
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
12
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
13
Caux Formatiquecauxformatique.fr

Specialized in management software, providing implementation, training, and support services for accounting, sales, payroll systems to professional clients Also offers IT maintenance

Software Development 馃嚝馃嚪 Sainte-Marie-des-Champs 27 1988

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14
DP Eventsdp-events.com

Expertise in event planning, offering strategic advice, operational management, and organizing large-scale events for various clients Visit website for more information

Events Services 馃嚝馃嚪 Sainte-Adresse 26 2008
15
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
16
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
17
SIQUAL Informatiquesiqual.fr

Specializing in web solutions and information systems management, this company serves small businesses to large industrial groups with a focus on agility and client proximity

IT Services and IT Consulting 馃嚝馃嚪 Le Petit-Quevilly 22 n/a
18
Arthur Loyd Rouenarthur-loyd-rouen.com

A national network of real estate professionals offering expertise in commercial real estate projects across France with a focus on offices, warehouses, and retail spaces

Leasing Non-residential Real Estate 馃嚝馃嚪 Saint-Martin-du-Vivier 14 n/a
19
wcomplywcomply.com

Provides specialized advisory services for cybersecurity, risk, and compliance, focusing on SAP system protection, cloud migrations, identity management, and financial license optimization.

IT Services and IT Consulting 馃嚝馃嚪 Rouen 13 2019
20
SNOPSYSsnopsys.com

A technology company specialized in implementing custom Big Data architectures for large companies and SMEs, with expertise in Business Intelligence and Data Science

IT Services and IT Consulting 馃嚝馃嚪 Le Havre 5 2013
21
ALIENCE (cabinet d'experts)alience.fr

Business consulting and accounting firm specializing in business creation assistance, tax and financial advisory, auditing services, internal control procedures, and IT consulting

Financial Services 馃嚝馃嚪 Bois-Guillaume 5 2009
22
Alternatives Consulting and Assistancealternatives-co.com

Strategic operational partner for SMEs, offering expertise in business management, operational efficiency, sales growth, and innovative solutions for continuous improvement and sustainable growth

Business Consulting and Services 馃嚝馃嚪 Le Havre 4 2018
23
3A Solutions Group3asgroup.fr

Consulting & training firm specializing in helping organizations improve performance through management solutions, serving private and public sector clients globally

Business Consulting and Services 馃嚝馃嚪 Le Havre 4 2005
24
CECOP-RH

Management consulting firm in France specializing in HR solutions Located in Bihorel, offering services for companies seeking strategic HR guidance

Business Consulting and Services 馃嚝馃嚪 Bihorel 4 n/a
25
DSP Consultingdsp-consulting.com

The company provides consulting services in various sectors including development, strategy, and logistics, as well as training, conferences, and publications

Business Consulting and Services 馃嚝馃嚪 Le Havre 1 2018
26
Cabinet Michel Simond Rouenmsimond.fr

Specializing in business transmissions, offering comprehensive support in buying/selling businesses, commercial properties, and leases Utilizes national network and local expertise for successful outcomes

Leasing Non-residential Real Estate 馃嚝馃嚪 Yvetot 1 n/a

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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 12, 2026.

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