# Consulting firms headquartered in the Yvelines department
Tamtam tracks 72 consulting firms headquartered in the Yvelines department. This list ranks the 30 largest by number of employees on LinkedIn, led by SOCOTEC, LGM and Konica Minolta Business Solutions France. Their median headcount is 136. Half of them were founded in 2003 or later. The most common headquarters are Versailles (12), Velizy-Villacoublay (6) and Guyancourt (3).
This selection of consulting firms in Yvelines includes both large established groups and mid-sized companies, with a strong prevalence of IT services and IT consulting. SOCOTEC provides services for the entire life cycle of built assets, while LGM specializes in technological and digital engineering consulting. Konica Minolta Business Solutions France offers digital transformation solutions, and HexaWare provides tailored IT solutions and support.
A notable pattern is the concentration of headquarters in specific towns. Versailles hosts several of these companies, including HexaWare, GROUPE LR TECHNOLOGIES, act digital EMEA - Alter Solutions, STORDATA, and SOFYNE. Guyancourt is also a significant hub, home to SOCOTEC and Egis en France.
馃嚝馃嚪 Yvelines 路 30 companies 路 Updated Nov 12, 2026
| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [SOCOTEC](https://www.tamtam.ai/c/socotec) (socotec.fr)
Provides services throughout the entire life cycle of built assets for compliance, extended lifespan, improved performance, and people鈥檚 safety in construction, infrastructure, and industry. | Environmental Services | 馃嚝馃嚪 Guyancourt | 7,326 | 1953 |
| 2 | [LGM](https://www.tamtam.ai/c/lgm-velizy-villacoublay) (lgm.group)
The company offers technological, digital, and software engineering consulting, innovative solution design, and complex electronics production, supporting critical systems and industrial performance. | Engineering Services | 馃嚝馃嚪 Velizy-Villacoublay | 1,469 | 1991 |
| 3 | [Konica Minolta Business Solutions France](https://www.tamtam.ai/c/konica-minolta-business-solutions-france) (konicaminolta.fr)
Providing digital transformation solutions including imaging, cloud storage, IT services, and healthcare solutions Specializing in printing, AI technology, and eco-friendly initiatives | IT Services and IT Consulting | 馃嚝馃嚪 Carri猫res-sur-Seine | 1,148 | 1873 |
| 4 | [HexaWare](https://www.tamtam.ai/c/hexaware) (hexaware.net)
HexaWare offers tailored IT solutions and support to ensure continuity of your computer systems and constant access to your data | IT Services and IT Consulting | 馃嚝馃嚪 Versailles | 487 | 2003 |
| 5 | [GROUPE LR TECHNOLOGIES](https://www.tamtam.ai/c/groupe-lr-technologies) (lrtechnologies.fr)
Provides human-centered engineering services, focusing on well-being, CSR, skills development, and recognition across various technology sectors like AI, cybersecurity, and critical software. | IT Services and IT Consulting | 馃嚝馃嚪 Versailles | 397 | 2014 |
| 6 | [Saphir Group](https://www.tamtam.ai/c/saphir-group) (quariq.com)
Provides Industry 4.0 solutions, industrial automation, MES/MOM, PLM, data and AI, OT security for manufacturers, from strategy to execution globally. | IT Services and IT Consulting | 馃嚝馃嚪 Montigny-le-Bretonneux | 380 | 2024 |
| 7 | [Egis en France](https://www.tamtam.ai/c/egis-en-france) (egis-group.com)
International consulting, construction engineering, and mobility services company. Designs and operates smart infrastructure and buildings addressing climate challenges for balanced and sustainable territorial development. | Civil Engineering | 馃嚝馃嚪 Guyancourt | 349 | |
| 8 | [act digital EMEA - Alter Solutions](https://www.tamtam.ai/c/act-digital-emea-alter-solutions) (actdigital.com)
AI-first multinational technology company providing customized, scalable solutions with local agility and global expertise to create business value. | IT Services and IT Consulting | 馃嚝馃嚪 Versailles | 284 | 2006 |
| 9 | [Cegedim Outsourcing](https://www.tamtam.ai/c/cegedim-outsourcing) (cegedim-outsourcing.fr)
Specializes in IT and BPO services with strong technological partnerships, providing high-level technical expertise and independent consulting. | IT Services and IT Consulting | 馃嚝馃嚪 Velizy-Villacoublay | 230 | |
| 10 | [TVH Consulting](https://www.tamtam.ai/c/tvh-consulting) (tvhconsulting.fr)
An international software company specializing in ERP solutions, systems integration, and industry-specific solutions for various verticals globally | IT Services and IT Consulting | 馃嚝馃嚪 Maisons-Laffitte | 221 | 2003 |
| 11 | [STORDATA](https://www.tamtam.ai/c/stordata) (stordata.fr)
Specializing in data management, STORDATA offers consulting, architecture, implementation, and support services, focusing on storage, backup, archiving, and virtualization solutions for clients' success | IT Services and IT Consulting | 馃嚝馃嚪 Versailles | 177 | 1988 |
| 12 | [SOFYNE](https://www.tamtam.ai/c/sofyne) (sofynetech.com)
Specialized IT services company in MES/MOM and PLM domains, providing solutions for industry challenges through Industry 40 principles and ISO27001 certification | IT Services and IT Consulting | 馃嚝馃嚪 Versailles | 174 | 2005 |
| 13 | [EXPERTIME](https://www.tamtam.ai/c/expertime) (expertime.com)
Digital performance partner focusing on user experience, offering expertise in collaborative tools, e-commerce, BI, digital communication, and more Specializing in strategy, design, and development services | IT Services and IT Consulting | 馃嚝馃嚪 Viroflay | 149 | 2003 |
| 14 | [Digital Product Simulation](https://www.tamtam.ai/c/digital-product-simulation) (dps-fr.com)
Specializes in integrating simulation and analysis into industrial product design, offering consulting, training, and software development services worldwide. | IT Services and IT Consulting | 馃嚝馃嚪 La Celle-Saint-Cloud | 149 | 1997 |
| 15 | [Euriware](https://www.tamtam.ai/c/euriware) (euriware.fr)
A digital services company with 20 years of experience in demanding sectors like energy, industry, and defense, providing consulting, integration, and support services | IT Services and IT Consulting | 馃嚝馃嚪 Guyancourt | 136 | |
| 16 | [Groupe Rouge Vif](https://www.tamtam.ai/c/groupe-rouge-vif) (grouperougevif.fr)
Advises on communication strategies, public and private territorial projects, and organizes events, focusing on human recognition and shared understanding across channels. | Advertising Services | 馃嚝馃嚪 Versailles | 114 | 1988 |
| 17 | [BETOM Ing茅nierie (BETOM Group)](https://www.tamtam.ai/c/betom-ingenierie-betom-group) (betom-ingenierie.fr)
Providing comprehensive technical engineering services including preliminary studies, design, project monitoring, and future building maintenance anticipation for clients. | Construction | 馃嚝馃嚪 Velizy-Villacoublay | 106 | |
| 18 | [Energie & Service](https://www.tamtam.ai/c/energie-and-service) (energieetservice.fr)
Specialized independent engineering firm providing HVAC consultancy, energy audits, technical project management, and contract monitoring for public and private building energy efficiency projects. | Environmental Services | 馃嚝馃嚪 Versailles | 103 | 1986 |
| 19 | [NAMIXIS](https://www.tamtam.ai/c/namixis) (namixis.net)
A consulting company specializing in optimizing building systems such as elevators, escalators, automatic doors, heating, cooling, and fire safety systems | Real Estate | 馃嚝馃嚪 Montigny-le-Bretonneux | 81 | |
| 20 | [KBU Conseil - Syst猫mes d'Information du Secteur Public](https://www.tamtam.ai/c/kbu-conseil-systemes-d-information-du-secteur-public) (kbuconseil.com)
A company founded by an experienced DSI specializing in digital transformation for local public sector, providing pragmatic consulting services to various organizations | IT Services and IT Consulting | 馃嚝馃嚪 Versailles | 71 | 2016 |
| 21 | [VAGANET](https://www.tamtam.ai/c/vaganet) (vaganet.fr)
Pioneering agile delivery company specializing in digital transformation, technical expertise, innovation, and advisory services for IT projects Great Place to Work award winner | IT Services and IT Consulting | 馃嚝馃嚪 Velizy-Villacoublay | 69 | 2014 |
| 22 | [Groupe Osmozium](https://www.tamtam.ai/c/groupe-osmozium) (osmozium.com)
Specializes in managing heterogeneous IT infrastructures and delivering tailored outsourcing solutions for large corporate clients with high-quality, reliable services. | IT Services and IT Consulting | 馃嚝馃嚪 Versailles | 59 | 2002 |
| 23 | [BETOM Group](https://www.tamtam.ai/c/betom-group) (betom-group.com)
The company offers a wide range of services in construction and urban planning, from initial design to integration of building usage, focusing on sustainability and environmental management | Construction | 馃嚝馃嚪 Velizy-Villacoublay | 56 | |
| 24 | [EURODECISION - Groupe DecideOm](https://www.tamtam.ai/c/eurodecision-groupe-decideom) (eurodecision.com)
Specializing in business analytics, EURODECISION helps teams make optimal decisions by analyzing data and offering customized solutions using mathematical algorithms and AI | Software Development | 馃嚝馃嚪 Versailles | 50 | 1987 |
| 25 | [Caplogy](https://www.tamtam.ai/c/caplogy) (caplogy.com)
Specializing in R&D, technology, scientific services, and education, the company drives innovation with expert teams to advance future technologies and provide high-level training. | IT Services and IT Consulting | 馃嚝馃嚪 Velizy-Villacoublay | 47 | 2021 |
| 26 | [MTI France SAS](https://www.tamtam.ai/c/mti-france-sas) (fr.mti.com)
Provides tailored IT solutions and services in datacentre, security, and managed services with global experience and industry best practices. | IT Services and IT Consulting | 馃嚝馃嚪 Croissy-sur-Seine | 35 | 1988 |
| 27 | [Soft Control](https://www.tamtam.ai/c/soft-control) (soft-control.fr)
This company supports industries with automation, industrial IT, and electrotechnical equipment integration, ensuring technical performance and continuous improvement for installations across various sectors. | Automation Machinery Manufacturing | 馃嚝馃嚪 Plaisir | 30 | 1996 |
| 28 | [EITA Consulting](https://www.tamtam.ai/c/eita-consulting) (eitaconsulting.fr)
Specialists in digital transformation projects, covering data, AI, cloud, cybersecurity, and various programming languages, providing agile, industrial-grade solutions to clients. | IT Services and IT Consulting | 馃嚝馃嚪 Montesson | 28 | 2017 |
| 29 | [SET-WAY](https://www.tamtam.ai/c/set-way) (set-way.com)
human-sized engineering consulting firm providing reliable, creative, and attentive support to industrial clients in complex environments for studies, design, R&D, and operational performance. | Industrial Machinery Manufacturing | 馃嚝馃嚪 Versailles | 26 | 2009 |
| 30 | [MediTech Access](https://www.tamtam.ai/c/meditech-access) (meditechaccess.com)
specialized in market access for medical devices, in vitro diagnostic devices, and other health technologies like telemedicine in Europe. | Business Consulting and Services | 馃嚝馃嚪 Versailles | 26 | 2012 |
## 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 Yvelines department
- [The largest companies in the Yvelines department](https://www.tamtam.ai/l/largest-companies-yvelines) (1,469)
- [Multinational companies in the Yvelines department](https://www.tamtam.ai/l/multinational-companies-yvelines) (226)
- [Companies with in-house R&D in the Yvelines department](https://www.tamtam.ai/l/r-and-d-companies-yvelines) (160)
- [IT services companies in the Yvelines department](https://www.tamtam.ai/l/it-services-companies-yvelines) (121)
- [IT Services and IT Consulting companies in the Yvelines department](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-yvelines) (118)
- [Manufacturers in the Yvelines department](https://www.tamtam.ai/l/manufacturers-yvelines) (109)
- [Professional services firms in the Yvelines department](https://www.tamtam.ai/l/professional-services-firms-yvelines) (108)
- [Hardware manufacturers in the Yvelines department](https://www.tamtam.ai/l/hardware-companies-yvelines) (106)
- [Distributors and wholesalers in the Yvelines department](https://www.tamtam.ai/l/distributors-and-wholesalers-yvelines) (91)
- [Retail chains in the Yvelines department](https://www.tamtam.ai/l/retail-chains-yvelines) (89)
- [Aerospace and defence companies in the Yvelines department](https://www.tamtam.ai/l/aerospace-and-defense-companies-yvelines) (65)
- [Public sector organisations in the Yvelines department](https://www.tamtam.ai/l/public-sector-organisations-yvelines) (65)
- [Software Development companies in the Yvelines department](https://www.tamtam.ai/l/software-development-companies-yvelines) (56)
- [Business Consulting and Services companies in the Yvelines department](https://www.tamtam.ai/l/business-consulting-and-services-companies-yvelines) (53)
- [Government Administration companies in the Yvelines department](https://www.tamtam.ai/l/government-administration-companies-yvelines) (51)
- [Construction companies in the Yvelines department](https://www.tamtam.ai/l/construction-companies-yvelines) (50)
- [Automotive manufacturers and suppliers in the Yvelines department](https://www.tamtam.ai/l/automotive-companies-yvelines) (49)
- [Motor Vehicle Manufacturing companies in the Yvelines department](https://www.tamtam.ai/l/motor-vehicle-manufacturing-companies-yvelines) (49)
- [SaaS companies in the Yvelines department](https://www.tamtam.ai/l/saas-companies-yvelines) (49)
- [Education providers in the Yvelines department](https://www.tamtam.ai/l/education-companies-yvelines) (46)
- [Industrial Machinery Manufacturing companies in the Yvelines department](https://www.tamtam.ai/l/industrial-machinery-manufacturing-companies-yvelines) (43)
- [Critical infrastructure operators in the Yvelines department](https://www.tamtam.ai/l/critical-infrastructure-operators-yvelines) (41)
- [Family-owned companies in the Yvelines department](https://www.tamtam.ai/l/family-owned-companies-yvelines) (36)
- [Environmental services companies in the Yvelines department](https://www.tamtam.ai/l/environmental-services-companies-yvelines) (35)
## The same list elsewhere in France
- [Consulting firms in France](https://www.tamtam.ai/l/consulting-firms-france) (4,251)
- [Consulting firms in 脦le-de-France](https://www.tamtam.ai/l/consulting-firms-ile-de-france) (2,408)
- [Consulting firms in the Hauts-de-Seine department](https://www.tamtam.ai/l/consulting-firms-hauts-de-seine) (563)
- [Consulting firms in Auvergne-Rh么ne-Alpes](https://www.tamtam.ai/l/consulting-firms-auvergne-rhone-alpes) (412)
- [Consulting firms in the Rh么ne department](https://www.tamtam.ai/l/consulting-firms-rhone) (242)
- [Consulting firms in Occitanie](https://www.tamtam.ai/l/consulting-firms-occitanie) (236)
- [Consulting firms in Provence-Alpes-C么te d'Azur](https://www.tamtam.ai/l/consulting-firms-provence-alpes-cote-dazur) (233)
- [Consulting firms in Nouvelle-Aquitaine](https://www.tamtam.ai/l/consulting-firms-nouvelle-aquitaine) (166)
- [Consulting firms in Grand Est](https://www.tamtam.ai/l/consulting-firms-grand-est) (165)
- [Consulting firms in Hauts-de-France](https://www.tamtam.ai/l/consulting-firms-hauts-de-france) (161)
- [Consulting firms in Pays de la Loire](https://www.tamtam.ai/l/consulting-firms-pays-de-la-loire) (160)
- [Consulting firms in the Haute-Garonne department](https://www.tamtam.ai/l/consulting-firms-haute-garonne) (145)
- [Consulting firms in the Bouches-du-Rh么ne department](https://www.tamtam.ai/l/consulting-firms-bouches-du-rhone) (129)
- [Consulting firms in the Nord department](https://www.tamtam.ai/l/consulting-firms-nord) (115)
- [Consulting firms in Brittany](https://www.tamtam.ai/l/consulting-firms-brittany) (99)
- [Consulting firms in the Loire-Atlantique department](https://www.tamtam.ai/l/consulting-firms-loire-atlantique) (94)
- [Consulting firms in the Gironde department](https://www.tamtam.ai/l/consulting-firms-gironde) (82)
- [Consulting firms in the Is猫re department](https://www.tamtam.ai/l/consulting-firms-isere) (57)
- [Consulting firms in Paris](https://www.tamtam.ai/l/consulting-firms-paris) (1,532)
- [Consulting firms in Lyon](https://www.tamtam.ai/l/consulting-firms-lyon) (163)
- [Consulting firms in Toulouse](https://www.tamtam.ai/l/consulting-firms-toulouse) (98)
- [Consulting firms in Boulogne-Billancourt](https://www.tamtam.ai/l/consulting-firms-boulogne-billancourt) (88)
- [Consulting firms in Levallois-Perret](https://www.tamtam.ai/l/consulting-firms-levallois-perret) (83)
- [Consulting firms in Neuilly-sur-Seine](https://www.tamtam.ai/l/consulting-firms-neuilly-sur-seine) (73)
## The same list elsewhere
- [Consulting firms in the world](https://www.tamtam.ai/l/consulting-firms-in-the-world) (16,009)
- [Consulting firms in Europe](https://www.tamtam.ai/l/consulting-firms-in-europe) (8,900)
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Source: https://www.tamtam.ai/l/consulting-firms-yvelines