These Nantes-based professional services firms are mainly mid-sized companies. Most were founded between the 1960s and early 2000s, indicating a mature business environment. The firms cover a range of specialized services, including IT, engineering, and environmental consulting.
For example, Experis France provides IT services and talent solutions, while GEOFIT designs geographical databases and manages natural resources. Sce Aménagement & Environnement focuses on sustainable development and urban planning. Bessé is an independent insurance brokerage company, and FÉTIS Group offers engineering products and services for various industries. IMATECH specializes in advanced technology solutions and digital transformation.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Experis Franceexperisfrance.fr
Supports DSI with innovative digital transformation projects, providing IT services and talent solutions to enhance organizational performance, addressing specific needs. |
2,207 | |||
| 2 | 1,157 | ||||
| 3 |
Sce Aménagement & Environnementsce.fr
Sustainable development firm offering urban planning, civil engineering, and environmental services globally with 45+ years of experience and 500 professionals |
625 | |||
| 4 | 610 | ||||
| 5 | 534 | ||||
| 6 |
FÉTIS Groupfetis.group
Provides engineering products and services for off-road machinery, specialized vehicles, power generation, marine power, and manufacturing industries with focus on decarbonization. |
501 | |||
| 7 | 412 | ||||
| 8 |
ALTEREAalterea.fr
An all-trade and energy engineering company specializing in renovation, construction, and energy optimization projects across various sectors for over 10 years |
318 | |||
| 9 | 224 | ||||
| 10 |
Slash Intérim
Slash Intérim is a national network of temporary recruitment agents, aiming to blend human touch with digital innovation and empower independent recruitment professionals |
203 | |||
| 11 |
COCERTOcocerto.fr
Provides comprehensive accounting, audit, payroll, legal support, and digital tools to optimize and secure business operations with personalized service. |
200 | |||
| 12 |
MECAcluster-meca.fr
A cluster of companies offering mechanical analysis expertise to ensure safety and feasibility of constructions through material behavior, design, and stress calculation |
194 | |||
| 13 |
Compaslecompas.fr
Specializing in social observation of territories, creating observatories, conducting studies, and providing training for local governments to address social realities effectively |
182 | |||
| 14 | 128 | ||||
| 15 |
ASENSILEasensile.com
ASENSILE provides personalized professional development services for individuals and businesses, helping them navigate career challenges and reach success with a human-centered approach 🚀💼 |
121 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 16 |
EXEIS Conseilexeisconseil.com
Operational consulting firm supporting organizations in mastering transformations, addressing organizational, performance, and digitization challenges across multiple industries. |
104 | |||
| 17 |
ELEPHANT Technologieselephant-technologies.fr
Offers expert human-centered tech consultancy, ensuring perfect alignment between client needs and employee skills across various IT domains from idea to production. |
69 | |||
| 18 |
ABASEgeneration-net.org
ABASE 20 is a digital services company providing a variety of digital solutions and services to clients |
67 | |||
| 19 |
Cap-visiocap-visio.com
assembly, installation, implementation of remote meeting and multi-site communication solutions for SMEs and large accounts in France |
59 | |||
| 20 |
CAPTENcapten-group.com
Offers consulting, technical assistance, and fixed-price services in IT and industry, specializing in system information and industrial project management with expert consultants. |
52 | |||
| 21 |
FIT Conseilfit-conseil.fr
FIT Conseil is a Geomatics Experts company specialized in topography, asset description, digital imaging, and land activities for development projects and asset management |
52 | |||
| 22 | 51 | ||||
| 23 |
Kolibri Consultingkolibriconsulting.com
Kolibri Consulting is a Recruitment Agency specialized in Accounting and Agro-Food industries, providing personalized support to candidates and clients throughout the hiring process |
42 | |||
| 24 |
RUBIX CONSULTINGrubix-consulting.com
Specializing in integrating SAP solutions to streamline business processes and improve efficiency |
36 | |||
| 25 |
S3d Ingénieriesol3d.com
Independent consulting firm specializing in energy recovery from waste, offering engineering, consulting, and research services for sustainable initiatives like methanization and alternative fuels |
34 | |||
| 26 |
SEIF - Zendesk Premier Partnerseif-consult.com
SEIF specializes in simplifying customer relations through expert support in implementing Zendesk tools, training, and optimizing customer experience for success |
29 | |||
| 27 |
ACII by Audensielaudensiel.com
For over 20 years, ACII by Audensiel provides professional development support with a focus on digital transformation, IT consulting, data/AI, and cybersecurity projects |
28 | |||
| 28 | 26 | ||||
| 29 | 23 | ||||
| 30 |
Agence Francecomfrancecom.fr
A specialized digital agency in the tourism sector, Francecom optimizes clients' digital visibility and performance through cross-channel strategies and innovative solutions |
23 | |||
Turn this list into pipeline
Tamtam finds the decision-makers at every company on a list like this one, with verified emails, phone numbers and the buying signals that tell you when to reach out.
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 Nantes
- The largest companies in Nantes 955
- SaaS companies in Nantes 90
- Companies with in-house R&D in Nantes 78
- Software Development companies in Nantes 71
- IT Services and IT Consulting companies in Nantes 65
- Multinational companies in Nantes 64
- IT services companies in Nantes 64
- Business Consulting and Services companies in Nantes 55
- Law Practice companies in Nantes 54
- Consulting firms in Nantes 51
- Public sector organisations in Nantes 51
- Education providers in Nantes 50
- Retail chains in Nantes 50
- Subscription businesses in Nantes 37
- Financial services firms in Nantes 33
- Real Estate companies in Nantes 33
- Recruitment and staffing agencies in Nantes 32
- Advertising Services companies in Nantes 32
- Companies with a mobile app in Nantes 31
- Higher Education companies in Nantes 29
- Technology, Information and Internet companies in Nantes 29
- Events Services companies in Nantes 28
- Critical infrastructure operators in Nantes 26
- Professional Training and Coaching companies in Nantes 25
The same list elsewhere in France
- Professional services firms in France 6,610
- Professional services firms in Île-de-France 3,377
- Professional services firms in Auvergne-Rhône-Alpes 711
- Professional services firms in the Hauts-de-Seine department 629
- Professional services firms in Provence-Alpes-Côte d'Azur 433
- Professional services firms in the Rhône department 400
- Professional services firms in Occitanie 399
- Professional services firms in Grand Est 316
- Professional services firms in Nouvelle-Aquitaine 308
- Professional services firms in Hauts-de-France 260
- Professional services firms in Pays de la Loire 253
- Professional services firms in the Bouches-du-Rhône department 249
- Professional services firms in the Haute-Garonne department 208
- Professional services firms in the Nord department 178
- Professional services firms in Brittany 167
- Professional services firms in the Loire-Atlantique department 158
- Professional services firms in the Gironde department 151
- Professional services firms in Normandy 114
- Professional services firms in the Yvelines department 108
- Professional services firms in Paris 2,241
- Professional services firms in Lyon 265
- Professional services firms in Toulouse 139
- Professional services firms in Marseille 123
- Professional services firms in Boulogne-Billancourt 102