# Professional services firms headquartered in Neuilly-sur-Seine

Tamtam tracks 79 professional services firms headquartered in Neuilly-sur-Seine. This list ranks the 30 largest by number of employees on LinkedIn, led by Altran, Vulcain Engineering Group and PwC France. Their median headcount is 330. Half of them were founded in 2006 or later.

This selection of professional services firms in Neuilly-sur-Seine includes large consulting and IT services companies. Altran, now Capgemini Engineering, provides engineering services, while PwC France offers consulting, audit, legal, and tax expertise. Scalian focuses on digital transformation and operations performance, and Grant-Thornton France provides audit and financial advisory services.

Several companies specialize in IT services and digital transformation, such as Infotel, SFEIR, and AMEXIO. The list also features a law firm, CMS Francis Lefebvre Avocats, which offers international legal and tax advisory services. Many of these firms were founded between the mid-1980s and the late 2000s, indicating a period of growth in the professional services sector.

🇫🇷 Neuilly-sur-Seine · 30 companies · Updated Nov 13, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Altran](https://www.tamtam.ai/c/altran) (capgemini-engineering.com)<br>Altran, now Capgemini Engineering, offers engineering services Follow them on LinkedIn for updates and insights | IT Services and IT Consulting | 🇫🇷 Neuilly-sur-Seine | 11,652 |  |
| 2 | [Vulcain Engineering Group](https://www.tamtam.ai/c/vulcain-engineering-group) (vulcain-eng.com)<br>Provides engineering consulting and project solutions for energy and environmental sectors, delivering technical assistance, expertise, and project management globally. | Business Consulting and Services | 🇫🇷 Neuilly-sur-Seine | 5,234 | 2005 |
| 3 | [PwC France](https://www.tamtam.ai/c/pwc-france) (pwc.fr)<br>Offers consulting, audit, legal, and tax expertise, blending technology with multidisciplinary knowledge to accelerate sustainable business transformation for organizations. | Business Consulting and Services | 🇫🇷 Neuilly-sur-Seine | 4,109 |  |
| 4 | [Scalian](https://www.tamtam.ai/c/scalian) (scalian.com)<br>A global company founded in 1989 with 3 business lines focusing on Digital Transformation, Digital Systems, and Operations Performance across various countries | Business Consulting and Services | 🇫🇷 Neuilly-sur-Seine | 4,098 | 1989 |
| 5 | [Grant-Thornton France](https://www.tamtam.ai/c/grant-thornton-france) (grantthornton.fr)<br>Provides audit, financial advisory, operational consulting, legal and tax advice, and sustainable transformation services to French businesses. | Financial Services | 🇫🇷 Neuilly-sur-Seine | 2,342 | 1964 |
| 6 | [Infotel](https://www.tamtam.ai/c/infotel) (infotel.com)<br>Provides IT and digital transformation consulting for large enterprises, focusing on strategic design, technological expertise, and agile development, from conception to implementation. | IT Services and IT Consulting | 🇫🇷 Neuilly-sur-Seine | 1,894 | 1979 |
| 7 | [SFEIR](https://www.tamtam.ai/c/sfeir) (sfeir.com)<br>Provides expert application development across web, mobile, cloud, data, and IoT, guiding clients through digital transformation with innovative products. | IT Services and IT Consulting | 🇫🇷 Neuilly-sur-Seine | 1,083 | 1985 |
| 8 | [CMS Francis Lefebvre Avocats](https://www.tamtam.ai/c/cms-francis-lefebvre-avocats) (cms.law)<br>Provides specialized international legal and tax advisory services covering corporate, employment, and commercial law for major global corporations across diverse industrial sectors. | Law Practice | 🇫🇷 Neuilly-sur-Seine | 958 | 1925 |
| 9 | [ACT-ON GROUP](https://www.tamtam.ai/c/act-on-group) (actongroup.com)<br>Consulting and services company specializing in human resources, data, and technology to support organizational, digital, and cultural transformation projects. | Business Consulting and Services | 🇫🇷 Neuilly-sur-Seine | 593 | 2001 |
| 10 | [Hervé Schauer Consultants (HSC)](https://www.tamtam.ai/c/herve-schauer-consultants-hsc) (hs2.fr)<br>Provides information security consulting, audits, penetration tests, risk management, and training services to secure diverse infrastructures and systems. | Computer and Network Security | 🇫🇷 Neuilly-sur-Seine | 500 | 1989 |
| 11 | [AMEXIO](https://www.tamtam.ai/c/amexio) (amexiogroup.com)<br>Digital transformation partner specializing in Enterprise Content Management, Customer Communication Management, and Customer Experience Management, prioritizing human excellence for successful outcomes | IT Services and IT Consulting | 🇫🇷 Neuilly-sur-Seine | 477 | 2006 |
| 12 | [RAINBOW PARTNERS GROUP](https://www.tamtam.ai/c/rainbow-partners-group) (rainbowpartners.com)<br>Multispecialist consulting group with global presence, offering expertise in finance, industry, data, AI, blockchain, cybersecurity, and digital transformation for large clients. | Business Consulting and Services | 🇫🇷 Neuilly-sur-Seine | 445 | 2007 |
| 13 | [QUANTEAM (RAINBOW PARTNERS Group)](https://www.tamtam.ai/c/quanteam-rainbow-partners-group) (quanteam.fr)<br>Supports corporate clients across the Front-to-Back chain, in evolving their business activities and transformation projects, with business and IT competence. | IT Services and IT Consulting | 🇫🇷 Neuilly-sur-Seine | 368 | 2007 |
| 14 | [SMR](https://www.tamtam.ai/c/smr) (smr-bc.com)<br>Specialized consulting firm providing qualified talent, recruitment assistance services, and consultant placements | Business Consulting and Services | 🇫🇷 Neuilly-sur-Seine | 368 |  |
| 15 | [SOFIP](https://www.tamtam.ai/c/sofip) (sofip-sa.fr)<br>Commercial strategy development, brand promotion management, and consumer engagement services for pharmaceutical, parapharmaceutical, and cosmetic industries to optimize product distribution and sales growth. | Business Consulting and Services | 🇫🇷 Neuilly-sur-Seine | 330 | 1982 |
| 16 | [INFOGENE](https://www.tamtam.ai/c/infogene) (infogene.fr)<br>Specializes in digital solutions, business intelligence, and engineering services, including R&D support, software selection, and application maintenance for various industries. | IT Services and IT Consulting | 🇫🇷 Neuilly-sur-Seine | 327 | 2013 |
| 17 | [APGAR](https://www.tamtam.ai/c/apgar) (apgar-group.com)<br>Provides global consultancy and managed services in data management and AI, supporting diverse industries with sustainable, innovative solutions. | Business Consulting and Services | 🇫🇷 Neuilly-sur-Seine | 278 | 2013 |
| 18 | [TechSell](https://www.tamtam.ai/c/techsell) (techsell.fr)<br>Specializes in recruiting, training, and managing sales teams to enhance brand presence and shopper experience across France retail environments. | Advertising Services | 🇫🇷 Neuilly-sur-Seine | 261 | 2006 |
| 19 | [GroupeVital-France](https://www.tamtam.ai/c/groupevital-france) (groupe-vital.com)<br>The French independent IT consultancy group specializes in user support, IT production, and services spanning from Mainframe to Cloud environments nationwide | IT Services and IT Consulting | 🇫🇷 Neuilly-sur-Seine | 243 | 1998 |
| 20 | [Gravitas](https://www.tamtam.ai/c/gravitas) (linedata.com)<br>A company specializing in financial software solutions, recently acquired by Linedata Visit Linedata on Linkedin or their website for updates | IT Services and IT Consulting | 🇫🇷 Neuilly-sur-Seine | 184 | 1998 |
| 21 | [Pharmafield Groupe](https://www.tamtam.ai/c/pharmafield-groupe) (pharmafield.fr)<br>Comprehensive services optimizing healthcare industry performance through medical promotion, sales networks, outsourcing solutions, administrative management, and strategic product environment analysis. | Pharmaceutical Manufacturing | 🇫🇷 Neuilly-sur-Seine | 164 | 2013 |
| 22 | [Olifan Group](https://www.tamtam.ai/c/olifan-group) (olifangroup.com)<br>French leader in wealth management, helping individuals and leaders structure, optimize, and transfer assets. Supports with retirement, vulnerability, and investment strategies. | Financial Services | 🇫🇷 Neuilly-sur-Seine | 158 | 2014 |
| 23 | [LVMH Client Services](https://www.tamtam.ai/c/lvmh-client-services)<br>remote client relationship management, service incubator, center of expertise, strategic consulting, digital innovation, client service transformation | Retail Luxury Goods and Jewelry | 🇫🇷 Neuilly-sur-Seine | 145 | 2017 |
| 24 | [PwC Consulting - People & Organization](https://www.tamtam.ai/c/pwc-consulting-people-and-organization) (pwc.fr)<br>Specializing in consulting and audit services, the company focuses on human-centered transformation projects, integrating operational performance with human development for successful business outcomes | Business Consulting and Services | 🇫🇷 Neuilly-sur-Seine | 145 | 1970 |
| 25 | [PRICEWATERHOUSECOOPERS ADVISORY](https://www.tamtam.ai/c/pricewaterhousecoopers-advisory) (pwc.com)<br>An innovative community offering solutions through human ingenuity, technology, and products to enhance trust and achieve lasting results for organizations | Business Consulting and Services | 🇫🇷 Neuilly-sur-Seine | 136 |  |
| 26 | [KYC Consulting](https://www.tamtam.ai/c/kyc-consulting) (kyc-consulting.com)<br>Management consulting firm specializing in delivering projects for financial institutions, with a team of experienced consultants offering high-quality services and added value in a constantly changing environment | Business Consulting and Services | 🇫🇷 Neuilly-sur-Seine | 134 | 2010 |
| 27 | [Openvalue](https://www.tamtam.ai/c/openvalue) (openvalue.co)<br>Openvalue is a consulting and integration firm specializing in Data & Artificial Intelligence, offering services in Machine Learning, NLP, UX design, and application development | Professional Services | 🇫🇷 Neuilly-sur-Seine | 133 | 2014 |
| 28 | [CARBON IT](https://www.tamtam.ai/c/carbon-it) (carbon-it.fr)<br>Consulting and IT expertise in Artificial Intelligence and Software Engineering. Structuring and industrializing digital ambitions combining technical excellence, methodological rigor, and business value creation. | IT Services and IT Consulting | 🇫🇷 Neuilly-sur-Seine | 121 | 2013 |
| 29 | [BOCASAY](https://www.tamtam.ai/c/bocasay) (bocasay.com)<br>Develops web and application solutions, offering dedicated teams and fixed-price projects for digital needs, specializing in design, development, maintenance, and training. | IT Services and IT Consulting | 🇫🇷 Neuilly-sur-Seine | 110 | 2012 |
| 30 | [Pharmasys](https://www.tamtam.ai/c/pharmasys) (pharmasys.fr)<br>A consultant company specializing in customized services for healthcare industry, focusing on Engineering, Quality, Data Integrity, and GxP Compliance Offering expertise in regulatory compliance and system validation | IT Services and IT Consulting | 🇫🇷 Neuilly-sur-Seine | 90 | 2006 |

## 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 Neuilly-sur-Seine

- [The largest companies in Neuilly-sur-Seine](https://www.tamtam.ai/l/largest-companies-neuilly-sur-seine) (447)
- [Multinational companies in Neuilly-sur-Seine](https://www.tamtam.ai/l/multinational-companies-neuilly-sur-seine) (109)
- [IT services companies in Neuilly-sur-Seine](https://www.tamtam.ai/l/it-services-companies-neuilly-sur-seine) (87)
- [IT Services and IT Consulting companies in Neuilly-sur-Seine](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-neuilly-sur-seine) (76)
- [Consulting firms in Neuilly-sur-Seine](https://www.tamtam.ai/l/consulting-firms-neuilly-sur-seine) (73)
- [Business Consulting and Services companies in Neuilly-sur-Seine](https://www.tamtam.ai/l/business-consulting-and-services-companies-neuilly-sur-seine) (48)
- [Advertising Services companies in Neuilly-sur-Seine](https://www.tamtam.ai/l/advertising-services-companies-neuilly-sur-seine) (37)
- [Marketing and communications agencies in Neuilly-sur-Seine](https://www.tamtam.ai/l/marketing-agencies-neuilly-sur-seine) (33)
- [Companies with in-house R&D in Neuilly-sur-Seine](https://www.tamtam.ai/l/r-and-d-companies-neuilly-sur-seine) (31)
- [SaaS companies in Neuilly-sur-Seine](https://www.tamtam.ai/l/saas-companies-neuilly-sur-seine) (31)
- [Recruitment and staffing agencies in Neuilly-sur-Seine](https://www.tamtam.ai/l/recruitment-agencies-neuilly-sur-seine) (26)
- [Software Development companies in Neuilly-sur-Seine](https://www.tamtam.ai/l/software-development-companies-neuilly-sur-seine) (26)

## 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)

---

Source: https://www.tamtam.ai/l/professional-services-firms-neuilly-sur-seine