# 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).
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.
馃嚝馃嚪 Seine-Maritime 路 26 companies 路 Updated Nov 12, 2026
| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [SOCAPS](https://www.tamtam.ai/c/socaps) (socaps.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)](https://www.tamtam.ai/c/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 | |
| 3 | [GH Connective \| B Corp](https://www.tamtam.ai/c/gh-connective-b-corp) (ghconnective.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 Conseil](https://www.tamtam.ai/c/groupe-dec-diagnostic-expertise-conseil) (groupe-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 | [Helpevia](https://www.tamtam.ai/c/helpevia) (helpevia.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 | [Semafor](https://www.tamtam.ai/c/semafor) (semafor.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 | [DEVOLIS](https://www.tamtam.ai/c/devolis) (devolis.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 Agility](https://www.tamtam.ai/c/docaposte-agility) (docaposte-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 | [REDLab](https://www.tamtam.ai/c/redlab) (redlab.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 logiciel](https://www.tamtam.ai/c/enovea-votre-partenaire-logiciel) (enovea.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 LD](https://www.tamtam.ai/c/atelier-ld) (atelierld.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 Service](https://www.tamtam.ai/c/ace-service) (attineos.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 Formatique](https://www.tamtam.ai/c/caux-formatique) (cauxformatique.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 |
| 14 | [DP Events](https://www.tamtam.ai/c/dp-events) (dp-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 | [ABEXE](https://www.tamtam.ai/c/abexe) (bizouard.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 EXTENSE](https://www.tamtam.ai/c/cdh-extense) (cdhexpertises.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 Informatique](https://www.tamtam.ai/c/siqual-informatique) (siqual.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 | |
| 18 | [Arthur Loyd Rouen](https://www.tamtam.ai/c/arthur-loyd-rouen) (arthur-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 | |
| 19 | [wcomply](https://www.tamtam.ai/c/wcomply) (wcomply.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 | [SNOPSYS](https://www.tamtam.ai/c/snopsys) (snopsys.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)](https://www.tamtam.ai/c/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 Assistance](https://www.tamtam.ai/c/alternatives-consulting-and-assistance) (alternatives-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 Group](https://www.tamtam.ai/c/3a-solutions-group) (3asgroup.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](https://www.tamtam.ai/c/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 | |
| 25 | [DSP Consulting](https://www.tamtam.ai/c/dsp-consulting) (dsp-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 Rouen](https://www.tamtam.ai/c/cabinet-michel-simond-rouen) (msimond.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 | |
## 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.
## More company lists in the Seine-Maritime department
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- [Real Estate companies in the Seine-Maritime department](https://www.tamtam.ai/l/real-estate-companies-seine-maritime) (30)
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- [Industrial Machinery Manufacturing companies in the Seine-Maritime department](https://www.tamtam.ai/l/industrial-machinery-manufacturing-companies-seine-maritime) (27)
- [Hospitals and Health Care companies in the Seine-Maritime department](https://www.tamtam.ai/l/hospitals-and-health-care-companies-seine-maritime) (25)
## The same list elsewhere in France
- [Consulting firms in France](https://www.tamtam.ai/l/consulting-firms-france) (4,251)
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- [Consulting firms in Provence-Alpes-C么te d'Azur](https://www.tamtam.ai/l/consulting-firms-provence-alpes-cote-dazur) (233)
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- [Consulting firms in Hauts-de-France](https://www.tamtam.ai/l/consulting-firms-hauts-de-france) (161)
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## The same list elsewhere
- [Consulting firms in the world](https://www.tamtam.ai/l/consulting-firms-in-the-world) (16,009)
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Source: https://www.tamtam.ai/l/consulting-firms-seine-maritime