# Professional services firms headquartered in the Seine-et-Marne department

Tamtam tracks 41 professional services firms headquartered in the Seine-et-Marne department. This list ranks the 30 largest by number of employees on LinkedIn, led by Fives Maintenance, ELCIMAÏ and Crowe Fideliance. Their median headcount is 19. Half of them were founded in 2006 or later. The most common headquarters are Serris (6), Champs-sur-Marne (4) and Fontainebleau (2).

The professional services firms in Seine-et-Marne are mostly mid-sized companies providing a range of specialized expertise. Fives Maintenance offers industrial maintenance, ELCIMAÏ specializes in building and process engineering, and Crowe Fideliance is an accounting firm with broad financial services. Upper-Link focuses on collaborative IT solutions, while Baryton integrates ERP, CRM, and BI systems.

These firms show a significant presence in IT services, engineering, and financial consulting, indicating a diverse professional landscape. Headquarters are spread across several towns in the department, including Montévrain, Melun, Fontainebleau, and Champs-sur-Marne. Many of these companies were founded between the late 1980s and early 2000s, suggesting a period of growth in specialized service provision.

🇫🇷 Seine-et-Marne · 30 companies · Updated Nov 13, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Fives Maintenance](https://www.tamtam.ai/c/fives-maintenance) (fivesgroup.com)<br>Specializing in industrial maintenance for over twenty years, offering tailored solutions to ensure high availability of production facilities with a focus on safety and environmental responsibility | Commercial and Industrial Machinery Maintenance | 🇫🇷 Montévrain | 495 | 1997 |
| 2 | [ELCIMAÏ](https://www.tamtam.ai/c/elcimai) (elcimai.com)<br>A French holding specializing in building and process engineering, logistics consulting, and IT engineering, with subsidiaries catering to various industries | Engineering Services | 🇫🇷 Melun | 378 | 1992 |
| 3 | [Crowe Fideliance](https://www.tamtam.ai/c/crowe-fideliance) (fideliance.fr)<br>Accounting firm offering audit, consulting, wealth management, legal advice, financial reporting, social management, CSR, and digital services across multiple French locations. | Financial Services | 🇫🇷 Fontainebleau | 318 | 1978 |
| 4 | [Upper-Link (Inherent Group)](https://www.tamtam.ai/c/upper-link-inherent-group) (upper-link.com)<br>With over 15 years of experience, the company specializes in collaborative solutions such as Share Point, Domino, and EMP for effective project management | IT Services and IT Consulting | 🇫🇷 Lognes | 92 | 2007 |
| 5 | [Baryton](https://www.tamtam.ai/c/baryton) (groupetenor.com)<br>Integration of ERP, CRM, and BI solutions for SMEs and mid-sized companies to optimize business management and improve productivity. | Software Development | 🇫🇷 Serris | 59 | 1986 |
| 6 | [Factory Software - AVEVA Select France](https://www.tamtam.ai/c/factory-software-aveva-select-france) (factorysoftware.fr)<br>Development of reliable, scalable industrial software supporting Industry 4.0 and Smart Cities, serving industrial clients and infrastructure operators. | IT Services and IT Consulting | 🇫🇷 Champs-sur-Marne | 42 | 1986 |
| 7 | [Assistra Conseil en Recrutement & Missions](https://www.tamtam.ai/c/assistra-conseil-en-recrutement-and-missions) (assistra.fr)<br>Provides temporary specialized staff and recruits executive and non-executive personnel, including engineers and technicians, across various sectors in EU and French-speaking Maghreb countries. | Human Resources Services | 🇫🇷 Champs-sur-Marne | 40 | 2004 |
| 8 | [Groupe Foncier de France FR](https://www.tamtam.ai/c/groupe-foncier-de-france-fr) (groupe-foncier-de-france.fr)<br>Real estate group specialized in property management, rental management, real estate transactions, investor support across France for individuals and institutions. | Real Estate | 🇫🇷 Chessy | 35 | 2018 |
| 9 | [ITESS](https://www.tamtam.ai/c/itess) (itess.fr)<br>ITESS specializes in computer engineering and IP telephony services, ensuring reliable and efficient information systems to support business growth without unnecessary constraints | IT Services and IT Consulting | 🇫🇷 Fontainebleau | 29 | 2010 |
| 10 | [Pharmaspecific](https://www.tamtam.ai/c/pharmaspecific) (pharmaspecific.com)<br>Specialized clinical research company based in Paris area Offers efficient support for clinical and epidemiological trials on national, European, and international levels, focusing on Oncology, cardiology, and Hematology | Pharmaceutical Manufacturing | 🇫🇷 Champs-sur-Marne | 28 | 2010 |
| 11 | [Ferro Ingenierie](https://www.tamtam.ai/c/ferro-ingenierie) (ferro-ingenierie.fr)<br>With over 30 years of experience, this engineering firm provides project management and technical expertise services for building and network projects nationally and internationally | Construction | 🇫🇷 Perthes | 27 | 1992 |
| 12 | [C4C Études & Expertises](https://www.tamtam.ai/c/c4c-etudes-and-expertises) (c4c-etudes-expertises.fr)<br>A technical support company specializing in asbestos and lead expertise, project management, coordination, and supervision of construction projects in the building and civil engineering sectors | Construction | 🇫🇷 Chessy | 20 | 2013 |
| 13 | [ASMACO](https://www.tamtam.ai/c/asmaco) (asmaco.fr)<br>A company specializing in recruitment and technical assistance, supporting clients with industrial projects in heavy industries worldwide | Business Consulting and Services | 🇫🇷 Serris | 20 | 2020 |
| 14 | [Cabinet Collet & Associés](https://www.tamtam.ai/c/cabinet-collet-and-associes) (cabinetcollet.net)<br>Expert accounting and auditing services, including payroll, legal, agricultural, and equestrian matters, with strong activity in construction, hospitality, medical, real estate, and associations. | Accounting | 🇫🇷 Nemours | 20 | 1945 |
| 15 | [CABINET ECB](https://www.tamtam.ai/c/cabinet-ecb) (cabinetecb.com)<br>ECB provides comprehensive expertise in accounting, tax, legal, and business advisory services to entrepreneurs, guiding them through all stages of company growth | Accounting | 🇫🇷 Serris | 19 |  |
| 16 | [PCM GEODATA (SECTEUR)](https://www.tamtam.ai/c/pcm-geodata-secteur) (pcm-ingenierie.fr)<br>PCM Geodata offers technical solutions for soil, structure, infrastructure, and network modeling through a multidisciplinary team of technicians and engineers | Engineering Services | 🇫🇷 Bussy-Saint-Georges | 16 | 1992 |
| 17 | [VisioTerra](https://www.tamtam.ai/c/visioterra) (visioterra.fr)<br>Scientific consulting for Earth Observation programs through expert support, technical studies, software development, quality control, instrument verification, and GIS cartographic product manufacturing. | Environmental Services | 🇫🇷 Champs-sur-Marne | 16 | 2004 |
| 18 | [CSM EXPERTISE](https://www.tamtam.ai/c/csm-expertise) (csmexpertise.fr)<br>CSM EXPERTISE, founded in 2000, provides comprehensive financial, tax, and social management services to business leaders, along with commissariat aux comptes missions | Accounting | 🇫🇷 Seine-Port | 13 | 2000 |
| 19 | [META Conseil SAS](https://www.tamtam.ai/c/meta-conseil-sas) (meta-conseil.com)<br>META Conseil provides high-value strategic consulting services in a variety of public funding and innovation areas, going beyond traditional frameworks to meet client expectations | Business Consulting and Services | 🇫🇷 Chessy | 11 | 2013 |
| 20 | [BBA Audit Expertise Conseils](https://www.tamtam.ai/c/bba-audit-expertise-conseils) (groupe-bba.com)<br>An accounting firm located in Paris and Chanteloup-en-Brie, providing comprehensive support to businesses throughout their lifespan | Accounting | 🇫🇷 Chanteloup-en-Brie | 10 |  |
| 21 | [GROUPE HEBERT EXPERTISES - Expert immobilier - Expertise en évaluation immobilière -France](https://www.tamtam.ai/c/groupe-hebert-expertises-expert-immobilier-expertise-en-evaluation-immobiliere) (hebertexpertises.com)<br>Specializing in real estate valuation in France, the company has formed a group to enhance its services and resources for a competitive economic environment | Financial Services | 🇫🇷 Serris | 10 |  |
| 22 | [Buy the Moon](https://www.tamtam.ai/c/buy-the-moon) (buythemoon.fr)<br>A specialized consulting firm in project purchasing for construction and IT sectors, offering services in public and private markets with a focus on procurement strategy and tools | Business Consulting and Services | 🇫🇷 Villeneuve-Saint-Denis | 10 | 2020 |
| 23 | [Jason Consulting](https://www.tamtam.ai/c/jason-consulting) (jason-consulting.fr)<br>A multicultural company specializing in managing information security, risk management processes, compliance, and creating solutions for success in dynamic environments | IT Services and IT Consulting | 🇫🇷 Chelles | 9 | 2011 |
| 24 | [COMITE CONSEILS](https://www.tamtam.ai/c/comite-conseils) (comite-conseils.com)<br>Specialized consulting firm dedicated to social and economic committees (CSE) and employee representative bodies Offering daily support in labor relations and accredited training center | Business Consulting and Services | 🇫🇷 Brie-Comte-Robert | 9 | 1996 |
| 25 | [Qualith](https://www.tamtam.ai/c/qualith) (qualith.fr)<br>A French family group dedicated to creating enlightened solutions through mastered value chains, economic efficiency, human relations, and environmental protection | International Trade and Development | 🇫🇷 Lieusaint | 9 | 2019 |
| 26 | [C-JUSTICE - Commissaires de justice (Huissiers de justice)](https://www.tamtam.ai/c/c-justice-commissaires-de-justice-huissiers-de-justice) (brie-huissier-77.fr)<br>C-JUSTICE is a team of experienced enforcement officers providing high-quality, efficient, and transparent services in the Paris region, certified with ISO 9001 | Legal Services | 🇫🇷 Brie-Comte-Robert | 9 |  |
| 27 | [Aparté Expertise & Conseil](https://www.tamtam.ai/c/aparte-expertise-and-conseil) (aparte-conseil.com)<br>Aparté aims to provide expertise and responsiveness to businesses, allowing them to focus entirely on their core activities | Accounting | 🇫🇷 Serris | 9 | 2006 |
| 28 | [Ickowicz Notaires](https://www.tamtam.ai/c/ickowicz-notaires) (ickowicz.notaires.fr)<br>Our studies located in Vaujours (93) and Le Pin (77) provide support throughout the Paris East region | Legal Services | 🇫🇷 Le Pin | 7 | 2018 |
| 29 | [Binome Experts-Comptables](https://www.tamtam.ai/c/binome-experts-comptables) (binome-experts.fr)<br>Accounting firm providing business development support to companies locally in Serris, Paris region, and internationally for nearly 20 years. | Accounting | 🇫🇷 Serris | 7 |  |
| 30 | [HARMONY COMPTA - EXPERTISE ET CONSEIL](https://www.tamtam.ai/c/harmony-compta-expertise-et-conseil)<br>A small, customer-focused firm providing comprehensive accounting, tax, social, and legal services to meet the needs of businesses | Accounting | 🇫🇷 Pontault Combault | 6 |  |

## 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 13, 2026.

## More company lists in the Seine-et-Marne department

- [The largest companies in the Seine-et-Marne department](https://www.tamtam.ai/l/largest-companies-seine-et-marne) (946)
- [Multinational companies in the Seine-et-Marne department](https://www.tamtam.ai/l/multinational-companies-seine-et-marne) (139)
- [Companies with in-house R&D in the Seine-et-Marne department](https://www.tamtam.ai/l/r-and-d-companies-seine-et-marne) (104)
- [Manufacturers in the Seine-et-Marne department](https://www.tamtam.ai/l/manufacturers-seine-et-marne) (100)
- [Hardware manufacturers in the Seine-et-Marne department](https://www.tamtam.ai/l/hardware-companies-seine-et-marne) (84)
- [Distributors and wholesalers in the Seine-et-Marne department](https://www.tamtam.ai/l/distributors-and-wholesalers-seine-et-marne) (82)
- [Retail chains in the Seine-et-Marne department](https://www.tamtam.ai/l/retail-chains-seine-et-marne) (68)
- [Construction companies in the Seine-et-Marne department](https://www.tamtam.ai/l/construction-companies-seine-et-marne) (57)
- [Public sector organisations in the Seine-et-Marne department](https://www.tamtam.ai/l/public-sector-organisations-seine-et-marne) (49)
- [Family-owned companies in the Seine-et-Marne department](https://www.tamtam.ai/l/family-owned-companies-seine-et-marne) (48)
- [Government Administration companies in the Seine-et-Marne department](https://www.tamtam.ai/l/government-administration-companies-seine-et-marne) (39)
- [Industrial Machinery Manufacturing companies in the Seine-et-Marne department](https://www.tamtam.ai/l/industrial-machinery-manufacturing-companies-seine-et-marne) (34)
- [Wholesale companies in the Seine-et-Marne department](https://www.tamtam.ai/l/wholesale-companies-seine-et-marne) (34)
- [Critical infrastructure operators in the Seine-et-Marne department](https://www.tamtam.ai/l/critical-infrastructure-operators-seine-et-marne) (33)
- [Retail companies in the Seine-et-Marne department](https://www.tamtam.ai/l/retail-companies-seine-et-marne) (33)
- [Education providers in the Seine-et-Marne department](https://www.tamtam.ai/l/education-companies-seine-et-marne) (31)
- [IT Services and IT Consulting companies in the Seine-et-Marne department](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-seine-et-marne) (31)
- [IT services companies in the Seine-et-Marne department](https://www.tamtam.ai/l/it-services-companies-seine-et-marne) (29)
- [Contract manufacturers in the Seine-et-Marne department](https://www.tamtam.ai/l/contract-manufacturers-seine-et-marne) (26)
- [Healthcare providers in the Seine-et-Marne department](https://www.tamtam.ai/l/healthcare-providers-seine-et-marne) (26)
- [Higher Education companies in the Seine-et-Marne department](https://www.tamtam.ai/l/higher-education-companies-seine-et-marne) (25)

## The same list elsewhere in France

- [Professional services firms in France](https://www.tamtam.ai/l/professional-services-firms-france) (6,610)
- [Professional services firms in Île-de-France](https://www.tamtam.ai/l/professional-services-firms-ile-de-france) (3,376)
- [Professional services firms in Auvergne-Rhône-Alpes](https://www.tamtam.ai/l/professional-services-firms-auvergne-rhone-alpes) (711)
- [Professional services firms in the Hauts-de-Seine department](https://www.tamtam.ai/l/professional-services-firms-hauts-de-seine) (629)
- [Professional services firms in Provence-Alpes-Côte d'Azur](https://www.tamtam.ai/l/professional-services-firms-provence-alpes-cote-dazur) (433)
- [Professional services firms in the Rhône department](https://www.tamtam.ai/l/professional-services-firms-rhone) (400)
- [Professional services firms in Occitanie](https://www.tamtam.ai/l/professional-services-firms-occitanie) (399)
- [Professional services firms in Grand Est](https://www.tamtam.ai/l/professional-services-firms-grand-est) (317)
- [Professional services firms in Nouvelle-Aquitaine](https://www.tamtam.ai/l/professional-services-firms-nouvelle-aquitaine) (308)
- [Professional services firms in Hauts-de-France](https://www.tamtam.ai/l/professional-services-firms-hauts-de-france) (260)
- [Professional services firms in Pays de la Loire](https://www.tamtam.ai/l/professional-services-firms-pays-de-la-loire) (253)
- [Professional services firms in the Bouches-du-Rhône department](https://www.tamtam.ai/l/professional-services-firms-bouches-du-rhone) (249)
- [Professional services firms in the Haute-Garonne department](https://www.tamtam.ai/l/professional-services-firms-haute-garonne) (208)
- [Professional services firms in the Nord department](https://www.tamtam.ai/l/professional-services-firms-nord) (178)
- [Professional services firms in Brittany](https://www.tamtam.ai/l/professional-services-firms-brittany) (167)
- [Professional services firms in the Loire-Atlantique department](https://www.tamtam.ai/l/professional-services-firms-loire-atlantique) (158)
- [Professional services firms in the Gironde department](https://www.tamtam.ai/l/professional-services-firms-gironde) (151)
- [Professional services firms in Normandy](https://www.tamtam.ai/l/professional-services-firms-normandy) (114)
- [Professional services firms in the Yvelines department](https://www.tamtam.ai/l/professional-services-firms-yvelines) (108)
- [Professional services firms in Paris](https://www.tamtam.ai/l/professional-services-firms-paris) (2,241)
- [Professional services firms in Lyon](https://www.tamtam.ai/l/professional-services-firms-lyon) (265)
- [Professional services firms in Toulouse](https://www.tamtam.ai/l/professional-services-firms-toulouse) (139)
- [Professional services firms in Marseille](https://www.tamtam.ai/l/professional-services-firms-marseille) (123)
- [Professional services firms in Boulogne-Billancourt](https://www.tamtam.ai/l/professional-services-firms-boulogne-billancourt) (102)

## The same list elsewhere

- [Professional services firms in the world](https://www.tamtam.ai/l/professional-services-firms-in-the-world) (24,737)
- [Professional services firms in Europe](https://www.tamtam.ai/l/professional-services-firms-in-europe) (13,699)

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Source: https://www.tamtam.ai/l/professional-services-firms-seine-et-marne