# Consulting firms headquartered in the Val-de-Marne department

Tamtam tracks 57 consulting firms headquartered in the Val-de-Marne department. This list ranks the 30 largest by number of employees on LinkedIn, led by HN Services, Saretec Group and ADVANS Group. Their median headcount is 69. Half of them were founded in 1999 or later. The most common headquarters are Charenton-le-Pont (4), Cachan (3) and Saint-Mandé (3).

The Val-de-Marne department hosts a concentration of consulting firms, primarily in IT services, engineering, and environmental solutions. These companies range from established mid-sized firms to larger groups, reflecting a mature business environment. Key players include HN Services, providing IT services across various sectors; Saretec Group, specializing in insurance expertise; ADVANS Group, an engineering firm focused on electronic and software systems; and ONF International, offering forestry expertise.

A notable pattern among these firms is the strong presence of companies founded in the 1980s and 1990s, suggesting a period of significant growth and establishment for the consulting sector in the region. Many are headquartered in Charenton-le-Pont, Créteil, and Vincennes, indicating clusters of business activity within the department.

🇫🇷 Val-de-Marne · 30 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [HN Services](https://www.tamtam.ai/c/hn-services) (hn-services.com)<br>Provides IT services across banking, insurance, retail, and industry sectors, with an internal institute for professional IT training and career development. | IT Services and IT Consulting | 🇫🇷 Charenton-le-Pont | 1,476 | 1983 |
| 2 | [Saretec Group](https://www.tamtam.ai/c/saretec-group) (saretec.fr)<br>Specializing in insurance expertise and arbitration, we handle various areas such as construction, property, liability, and catastrophe response for insurers | Insurance | 🇫🇷 Créteil | 1,313 | 1977 |
| 3 | [ADVANS Group](https://www.tamtam.ai/c/advans-group) (advans-group.com)<br>Engineering firm specializing in electronic, software, and mechanical systems; handles projects or provides expertise in microelectronics, software development, data/AI, and mechanical engineering. | Engineering Services | 🇫🇷 Cachan | 1,040 | 2000 |
| 4 | [IT Link Group](https://www.tamtam.ai/c/it-link-group) (itlink.fr)<br>Innovates and optimizes connected systems, developing products and services in embedded intelligence, IoT, data, mobile apps, safety, business systems, engineering, and change management. | IT Services and IT Consulting | 🇫🇷 Le Kremlin-Bicêtre | 882 | 1986 |
| 5 | [ONF International](https://www.tamtam.ai/c/onf-international) (onfinternational.org)<br>Provides international forestry expertise, technical assistance, and training in natural forest management, climate projects, mapping, risk prevention, and biomass energy. | Environmental Services | 🇫🇷 Nogent-sur-Marne | 791 | 1997 |
| 6 | [Intalio](https://www.tamtam.ai/c/intalio) (intalio.com)<br>Accelerates business evolution with software solutions, improving speed, efficiency, and accuracy. Provides next-generation digital transformation, tackling frontier technology challenges. | Software Development | 🇫🇷 Fontenay-sous-Bois | 560 | 1990 |
| 7 | [Blue Soft](https://www.tamtam.ai/c/blue-soft) (bluesoft-group.com)<br>Blue Soft Group is a Digital Services Enterprise specializing in consulting, Cloud, agile development, UX/UI, and Microsoft solutions to optimize IT and business projects | IT Services and IT Consulting | 🇫🇷 Charenton-le-Pont | 501 | 2008 |
| 8 | [Jiliti](https://www.tamtam.ai/c/jiliti) (jiliti-group.com)<br>A trusted partner specializing in IT infrastructure management, offering agile solutions to maintain, transform, and optimize data centers for sustainable performance worldwide | IT Services and IT Consulting | 🇫🇷 Rungis | 350 |  |
| 9 | [MANERGY](https://www.tamtam.ai/c/manergy) (manergy.fr)<br>Specialized engineering and consulting firm providing innovative, sustainable solutions for energy efficiency, decarbonization, and renewable energy transitions across multiple sectors. | Environmental Services | 🇫🇷 Créteil | 343 | 1983 |
| 10 | [KLB](https://www.tamtam.ai/c/klb) (klb.com)<br>International consulting firm specializing in operational performance, supporting project definition, implementation, and monitoring across purchasing, finance, IT, and HR. | Business Consulting and Services | 🇫🇷 Vincennes | 339 | 1995 |
| 11 | [BPCE Solutions immobilières](https://www.tamtam.ai/c/bpce-solutions-immobilieres) (bpce.fr)<br>BPCE Real Estate Solutions is a leading French real estate consultancy providing a full range of services to assist property owners, professionals, financial institutions, and individuals in optimizing their assets | Real Estate | 🇫🇷 Charenton-le-Pont | 257 |  |
| 12 | [NEPSEN](https://www.tamtam.ai/c/nepsen) (nepsen.fr)<br>Consulting and engineering firm specializing in energy and ecological transition for public and private clients, focusing on sustainable and profitable projects. | Environmental Services | 🇫🇷 Vincennes | 220 | 1979 |
| 13 | [SEMOFI](https://www.tamtam.ai/c/semofi) (semofi-groupe.fr)<br>A geosciences consulting firm offering a complete range of services to optimize projects for municipalities, developers, and builders, with a focus on teamwork and personal growth | Civil Engineering | 🇫🇷 Villeneuve-le-Roi | 122 | 1997 |
| 14 | [EOL "A Dils company"](https://www.tamtam.ai/c/eol-a-dils-company) (eol.fr)<br>Specializes in corporate real estate transactions, investment advice, project management assistance, and energy innovation for logistics and industrial buildings. | Real Estate | 🇫🇷 Charenton-le-Pont | 105 | 2000 |
| 15 | [Junior Conseil Taker](https://www.tamtam.ai/c/junior-conseil-taker) (juniortaker.com)<br>Student association providing motivated and skilled students to develop IT projects for companies, bridging academic knowledge with real-world applications. | IT Services and IT Consulting | 🇫🇷 Le Kremlin-Bicêtre | 69 | 2014 |
| 16 | [AISI - Expert Cybersécurité, Infrastructure & Gouvernance](https://www.tamtam.ai/c/aisi-expert-cybersecurite-infrastructure-and-gouvernance) (aisi.fr)<br>Provides cybersecurity expertise and infrastructure solutions for SMEs, mid-caps, and local authorities, ensuring digital protection and resilience against cyber threats through active defense and expert management. | IT Services and IT Consulting | 🇫🇷 Saint-Mandé | 55 | 2010 |
| 17 | [EPF Projets](https://www.tamtam.ai/c/epf-projets) (epfprojets.com)<br>Student-led engineering consultancy providing IT development, business strategy, structural modeling, and eco-design services for entrepreneurs and large corporations seeking innovative and competitive technical solutions. | Software Development | 🇫🇷 Cachan | 47 | 2006 |
| 18 | [SIS Technologies](https://www.tamtam.ai/c/sis-technologies) (sis-t.com)<br>Provides complete solutions in the field of new technologies to ensure focus on your business and secure your operations | IT Services and IT Consulting | 🇫🇷 Arcueil | 44 | 2003 |
| 19 | [OTCI](https://www.tamtam.ai/c/otci) (otci.fr)<br>Engineering consultancy for urban development, building, and infrastructure projects, including technical design, project management, and construction economics. | Construction | 🇫🇷 Rungis | 42 | 1979 |
| 20 | [Groupe Avanista](https://www.tamtam.ai/c/groupe-avanista) (avanista.fr)<br>Avanista is a French company founded by two professionals with 30 years of IT service experience, prioritizing quality and a people-centric approach | IT Services and IT Consulting | 🇫🇷 Cachan | 40 | 2012 |
| 21 | [INCONCEPT](https://www.tamtam.ai/c/inconcept) (inconcept.eu)<br>Established in 1999, this company offers offshore engineering, subsea, and shipbuilding services with a focus on project management and solving technical challenges | Industrial Machinery Manufacturing | 🇫🇷 Bry-sur-Marne | 40 | 1999 |
| 22 | [FERCO](https://www.tamtam.ai/c/ferco) (ferco-experts.fr)<br>FERCO is an accounting firm in the Île-de-France region, providing expert advice in accounting, tax, financial, legal, and social matters to help businesses grow | Financial Services | 🇫🇷 Gentilly | 34 | 1965 |
| 23 | [ARESCOM - Société informatique](https://www.tamtam.ai/c/arescom-societe-informatique) (arescom.fr)<br>Arescom offers comprehensive IT consulting, management, security, and optimization services to over 200 clients, focusing on customer satisfaction and digital transformation solutions | IT Services and IT Consulting | 🇫🇷 Alfortville | 34 | 2007 |
| 24 | [QuantStack](https://www.tamtam.ai/c/quantstack) (quantstack.net)<br>The company specializes in developing scientific computing software including high performance C++, Python scientific stack, and interactive data visualization for web browsers | Software Development | 🇫🇷 Saint-Maur-des-Fossés | 32 | 2016 |
| 25 | [NR CONSEIL](https://www.tamtam.ai/c/nr-conseil) (nr-conseil.net)<br>Specializing in building and urban infrastructure, our company provides consulting, design, and engineering services for projects from feasibility to completion | Construction | 🇫🇷 Alfortville | 32 | 1993 |
| 26 | [Res publica - Cabinet de concertation](https://www.tamtam.ai/c/res-publica-cabinet-de-concertation) (respublica-conseil.fr)<br>Res publica specializes in engineering public participation processes for clients, helping improve decision-making and democratic functioning through method, rigor, and innovation | Business Consulting and Services | 🇫🇷 Arcueil | 30 | 2004 |
| 27 | [GT Expertise](https://www.tamtam.ai/c/gt-expertise) (gt-expertise.fr)<br>Provides accounting, tax, legal, payroll, HR, and consulting services for entrepreneurs. Focuses on client trust, transparency, and knowledge sharing in Saint-Mandé. | Financial Services | 🇫🇷 Saint-Mandé | 30 | 2015 |
| 28 | [Mentory](https://www.tamtam.ai/c/mentory) (mentory.eu)<br>Mentory is a project focused on inclusive skills acquisition in the Telecoms, Industries, and Infrastructure sectors | IT Services and IT Consulting | 🇫🇷 Saint-Mandé | 27 |  |
| 29 | [SILAMIR GROUP](https://www.tamtam.ai/c/silamir-group) (silamir.com)<br>Specializing in IT security and Mainframe recruitment for niche roles, our company focuses on human management and partnership with clients for project success | IT Services and IT Consulting | 🇫🇷 Maisons-Alfort | 26 | 1998 |
| 30 | [YLLY](https://www.tamtam.ai/c/ylly) (ylly.fr)<br>Specializing in digital transformation since 2009, we focus on creating value and measurable performance indicators, offering services in web/mobile development, change management, and continuous improvement | Business Consulting and Services | 🇫🇷 Ivry-sur-Seine | 24 | 2009 |

## 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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## The same list elsewhere in France

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## The same list elsewhere

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Source: https://www.tamtam.ai/l/consulting-firms-val-de-marne