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Top 30 professional services firms in Nantes

Tamtam tracks 83 professional services firms headquartered in Nantes. This list ranks the 30 largest by number of employees on LinkedIn, led by Experis France, 𝗚𝗘𝗢𝗙𝗜𝗧 and Sce Aménagement & Environnement. Their median headcount is 121. Half of them were founded in 2007 or later.

🇫🇷 Nantes30 companiesUpdated Nov 12, 2026

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.

#CompanyIndustryHeadquarters EmployeesFounded
1
Experis Franceexperisfrance.fr

Supports DSI with innovative digital transformation projects, providing IT services and talent solutions to enhance organizational performance, addressing specific needs.

IT Services and IT Consulting 🇫🇷 Nantes 2,207 n/a
2
𝗚𝗘𝗢𝗙𝗜𝗧geofit.fr

Designing geographical databases, securing land processes for private and development projects, producing national cartography, developing agriculture, and managing natural resources.

Space Research and Technology 🇫🇷 Nantes 1,157 1968
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

Environmental Services 🇫🇷 Nantes 625 1982
4
Bessébesse.fr

An independent insurance brokerage company with over 60 years of experience, specializing in protecting businesses and employees with innovative solutions and quality services

Insurance 🇫🇷 Nantes 610 1960
5
IMATECHima.eu

Development and integration of advanced technology solutions, software services, and digital transformation support for various industries and businesses.

Information Services 🇫🇷 Nantes 534 1999
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.

Engineering Services 🇫🇷 Nantes 501 1978
7
Edeisedeis.com

Specializing in engineering, operation, and construction solutions for the future, this company aims to become a leader in construction services and technical management

Engineering Services 🇫🇷 Nantes 412 2016
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

Construction 🇫🇷 Nantes 318 2004
9
Younupyounup.fr

This company offers IT services, supporting clients throughout the software lifecycle from requirements to production, focusing on web, DevOps, data, AI, agility, mobile, and cloud.

IT Services and IT Consulting 🇫🇷 Nantes 224 2019
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

Human Resources Services 🇫🇷 Nantes 203 2021
11
COCERTOcocerto.fr

Provides comprehensive accounting, audit, payroll, legal support, and digital tools to optimize and secure business operations with personalized service.

Accounting 🇫🇷 Nantes 200 1971
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

Business Consulting and Services 🇫🇷 Nantes 194 2006
13
Compaslecompas.fr

Specializing in social observation of territories, creating observatories, conducting studies, and providing training for local governments to address social realities effectively

Research Services 🇫🇷 Nantes 182 1996
14
kanomakanoma.fr

Experts guide clients digital transformation, from design to production, focusing on agile projects, development, product design, and organizational change.

IT Services and IT Consulting 🇫🇷 Nantes 128 2018
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 🚀💼

Professional Training and Coaching 🇫🇷 Nantes 121 n/a

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16
EXEIS Conseilexeisconseil.com

Operational consulting firm supporting organizations in mastering transformations, addressing organizational, performance, and digitization challenges across multiple industries.

Business Consulting and Services 🇫🇷 Nantes 104 2009
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.

IT Services and IT Consulting 🇫🇷 Nantes 69 2017
18
ABASEgeneration-net.org

ABASE 20 is a digital services company providing a variety of digital solutions and services to clients

IT Services and IT Consulting 🇫🇷 Nantes 67 1993
19
Cap-visiocap-visio.com

assembly, installation, implementation of remote meeting and multi-site communication solutions for SMEs and large accounts in France

IT Services and IT Consulting 🇫🇷 Nantes 59 2008
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.

Business Consulting and Services 🇫🇷 Nantes 52 2017
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

Real Estate 🇫🇷 Nantes 52 1968
22
Mosicamosica.fr

Specialized in IT strategy, architecture consulting, and tailored solutions, MOSICA helps companies transform their information systems in the digital era

IT Services and IT Consulting 🇫🇷 Nantes 51 2011
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

Staffing and Recruiting 🇫🇷 Nantes 42 2018
24
RUBIX CONSULTINGrubix-consulting.com

Specializing in integrating SAP solutions to streamline business processes and improve efficiency

IT Services and IT Consulting 🇫🇷 Nantes 36 2019
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

Environmental Services 🇫🇷 Nantes 34 2007
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

IT Services and IT Consulting 🇫🇷 Nantes 29 2018
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

IT Services and IT Consulting 🇫🇷 Nantes 28 2000
28
Seyosseyos.fr

Recruitment agency specializing in IT, Tech, and Industry. Acquiring and evaluating high-value talent, including rare profiles, experts, managers, and executives since 2014.

Staffing and Recruiting 🇫🇷 Nantes 26 2014
29
Artlexartlex.eu

Established in 2004, led by 8 associate lawyers from international law firms, providing business law services in French and English nationwide and abroad Specializing in development, reorganization, and litigation support for French and foreign companies

Law Practice 🇫🇷 Nantes 23 2004
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

Technology, Information and Internet 🇫🇷 Nantes 23 1997

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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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