# 30 leading professional services firms in Lille

Tamtam tracks 54 professional services firms headquartered in Lille. This list ranks the 30 largest by number of employees on LinkedIn, led by BGE Hauts de France, ACALY Conseil en Ingénierie and Diligentia | Audit • Conseil • Expertise. Their median headcount is 30. Half of them were founded in 2011 or later.

The professional services firms in Lille listed here include a mix of established companies and younger businesses. Among the larger firms, BGE Hauts de France supports entrepreneurs with training and financing, while ACALY Conseil en Ingénierie offers technical and organizational consulting. Diligentia provides accounting and auditing services, and Citéo Médiation focuses on mediation and facilitation for societal change. Vacherand Immobilier is a family-owned real estate company.

The data shows a concentration of companies founded between 2010 and 2018, indicating a period of growth for new professional services ventures in Lille. Many of these newer firms specialize in digital transformation, IT services, and software development, such as Les-Tilleuls.coop, which designs web and mobile projects using open-source software.

🇫🇷 Lille · 30 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [BGE Hauts de France](https://www.tamtam.ai/c/bge-hauts-de-france) (bge-hautsdefrance.fr)<br>Support entrepreneurs with project preparation, training, financing, networking, and local expertise to increase chances of business success. | Professional Training and Coaching | 🇫🇷 Lille | 228 | 1979 |
| 2 | [ACALY Conseil en Ingénierie](https://www.tamtam.ai/c/acaly-conseil-en-ingenierie) (acaly.eu)<br>The company provides technical and organizational consulting services, offers work packages for project outsourcing, and focuses on research and innovation for clients' success | Business Consulting and Services | 🇫🇷 Lille | 183 | 2015 |
| 3 | [Diligentia \| Audit • Conseil • Expertise](https://www.tamtam.ai/c/diligentia-audit-conseil-expertise) (diligentia.fr)<br>An accounting and auditing firm in Northern France offering personalized support in accounting, taxation, legal, and social matters for businesses and professionals | Accounting | 🇫🇷 Lille | 133 |  |
| 4 | [Citéo Médiation](https://www.tamtam.ai/c/citeo-mediation) (citeo.org)<br>Mediation and facilitation agency assisting businesses, communities, and citizens in navigating societal change through tailored guidance promoting understanding, participation, and sustainable collective action | Civic and Social Organizations | 🇫🇷 Lille | 125 | 1998 |
| 5 | [Vacherand Immobilier](https://www.tamtam.ai/c/vacherand-immobilier) (vacherand.fr)<br>A family-owned company in the real estate sector since 1997, offering a range of services including property management, real estate transactions, and asset management | Real Estate | 🇫🇷 Lille | 125 | 1997 |
| 6 | [Les-Tilleuls.coop](https://www.tamtam.ai/c/les-tilleuls-coop) (les-tilleuls.coop)<br>Design and development of innovative web and mobile projects using open-source software, with democratic cooperative governance and profit sharing. | Software Development | 🇫🇷 Lille | 74 | 2011 |
| 7 | [OTTEO](https://www.tamtam.ai/c/otteo) (otteo.fr)<br>A consulting and engineering company offering services in product development, recruitment assistance, and professional training across various sectors Contact for more information | Business Consulting and Services | 🇫🇷 Lille | 57 | 2010 |
| 8 | [Crowe COGEFIS - Groupe Fideliance](https://www.tamtam.ai/c/crowe-cogefis-groupe-fideliance) (crowe.com)<br>COGEFIS is an independent accounting and auditing firm, part of the global network CROWE, providing specialized services to various organizations | Accounting | 🇫🇷 Lille | 42 | 1978 |
| 9 | [GenoScreen](https://www.tamtam.ai/c/genoscreen) (genoscreen.fr)<br>Innovative genomics company providing tailored solutions in healthcare, agronomy, skincare, etc through DNA analysis, sequencing, consultation, and training services | Biotechnology Research | 🇫🇷 Lille | 39 | 2001 |
| 10 | [ICSIS](https://www.tamtam.ai/c/icsis) (icsis.fr)<br>An innovative digital company specializing in digital transformation projects, offering a wide range of services such as app development, BI, and project management assistance | IT Services and IT Consulting | 🇫🇷 Lille | 37 | 2013 |
| 11 | [BeWe](https://www.tamtam.ai/c/bewe) (bewe.eu)<br>A service company specializing in guiding organizations through digital transformation with expertise in collaboration solutions, business consulting, technology integration, change management, and user adoption | IT Services and IT Consulting | 🇫🇷 Lille | 36 | 2013 |
| 12 | [ORSEU ETHIX](https://www.tamtam.ai/c/orseu-ethix) (orseu-ethix.fr)<br>Provide expertise and support to CSE representatives for economic understanding, negotiation, social policy improvement, and adapting to legislative changes. | Legal Services | 🇫🇷 Lille | 34 | 1992 |
| 13 | [OZEO Consulting](https://www.tamtam.ai/c/ozeo-consulting) (ozeo-consulting.fr)<br>OZEO Consulting is a young digital service company focusing on differentiated intellectual services with strong human values and excellence | IT Services and IT Consulting | 🇫🇷 Lille | 32 |  |
| 14 | [ZeTrace](https://www.tamtam.ai/c/zetrace) (zetrace.com)<br>A leading consultancy specializing in digital commerce transformation and sustainability for medium to large B2C and B2B organizations, offering expertise and recruitment services | Technology, Information and Internet | 🇫🇷 Lille | 31 | 2018 |
| 15 | [Dalt - Digital alternative](https://www.tamtam.ai/c/dalt-digital-alternative) (dalt.fr)<br>Custom web development, UX/UI design, digital marketing, and AI integration for businesses, delivering high-performance websites and scalable digital solutions focused on profitability. | Technology, Information and Internet | 🇫🇷 Lille | 30 | 2008 |
| 16 | [WINGEST AUDIT & EXPERTISE](https://www.tamtam.ai/c/wingest-audit-and-expertise)<br>WINGEST AUDIT & EXPERTISE is a certified accounting firm with offices in Epinay sur Seine and Lille, offering expert services | Accounting | 🇫🇷 Lille | 27 | 2015 |
| 17 | [ADHOC](https://www.tamtam.ai/c/adhoc-lille) (bilan-de-competences-lille.fr)<br>Specialists in career guidance, offering personalized support for individuals seeking reorientation through skills assessment and personalized coaching by a team of psychologists and HR consultants | Human Resources Services | 🇫🇷 Lille | 26 | 1999 |
| 18 | [L’Échappée Bière](https://www.tamtam.ai/c/l-echappee-biere) (event.echappee-biere.com)<br>A tourism and event agency specializing in beer, offering unique experiences, tours, and events focused on discovering the French and international beer culture | Events Services | 🇫🇷 Lille | 26 | 2013 |
| 19 | [ALTUS CONSEILS - GROUPE AFIGEC](https://www.tamtam.ai/c/altus-conseils-groupe-afigec) (afigec.com)<br>An accounting firm located in Lille, France, providing financial advisory services and solutions to businesses in the region | Business Consulting and Services | 🇫🇷 Lille | 25 | 2004 |
| 20 | [VIVALDI Avocats](https://www.tamtam.ai/c/vivaldi-avocats) (vivaldi-avocats.com)<br>A multi-bar law firm based in Paris and Lille specializing in Business Law with a team of 18 lawyers and legal experts They offer comprehensive legal services to a loyal clientele | Law Practice | 🇫🇷 Lille | 25 | 2001 |
| 21 | [French Payroll Services secrétariat social](https://www.tamtam.ai/c/french-payroll-services-secretariat-social) (frenchpayrollservices.fr)<br>Providing payroll services and legal advice for labor matters in France, including training Specializing in assisting international companies with French development and payroll | Business Consulting and Services | 🇫🇷 Lille | 25 |  |
| 22 | [Meedz](https://www.tamtam.ai/c/meedz) (meedz.io)<br>Meedz specializes in creating innovative digital tools to enhance client performance and competitiveness They excel in development, Devops, and data solutions | IT Services and IT Consulting | 🇫🇷 Lille | 24 | 2021 |
| 23 | [LUPISE](https://www.tamtam.ai/c/lupise) (lupise.fr)<br>The company specializes in securing organizations through cybersecurity services such as audits, training, project management, crisis management support, and secure development | IT Services and IT Consulting | 🇫🇷 Lille | 22 |  |
| 24 | [Talosi](https://www.tamtam.ai/c/talosi) (talosi.com)<br>Talosi is a new generation IT consulting company focused on personalized and transparent services, where employees feel at home They embrace a geek culture | IT Services and IT Consulting | 🇫🇷 Lille | 21 | 2021 |
| 25 | [IBM SERVICES CENTER FRANCE](https://www.tamtam.ai/c/ibm-services-center-france)<br>An IT services company in Lille, France, providing technology solutions and services to clients in the region and beyond | IT Services and IT Consulting | 🇫🇷 Lille | 21 |  |
| 26 | [Data-IT - Groupe IT & You ©️](https://www.tamtam.ai/c/data-it-groupe-it-and-you) (data-it.fr)<br>Data-IT is a high-end IT services company specialized in office and computer technologies, offering expertise and technical skills to develop and maintain clients' information systems | Computer and Network Security | 🇫🇷 Lille | 20 | 2014 |
| 27 | [Solener](https://www.tamtam.ai/c/solener) (solener.fr)<br>Solener is a sustainable building consultancy with over 30 years of experience, focusing on energy efficiency, environmental optimization, and innovative solutions | Construction | 🇫🇷 Lille | 17 | 1988 |
| 28 | [QUINTUOR](https://www.tamtam.ai/c/quintuor)<br>Specializing in business law, providing expert advice, guidance, and defense of corporate interests | Law Practice | 🇫🇷 Lille | 15 | 2014 |
| 29 | [SKILLX](https://www.tamtam.ai/c/skillx) (skillx.fr)<br>A technology company from Hauts-de-France specializing in cybersecurity and cloud services to accelerate clients' IT transition, with a liberated and trust-based approach | Computer and Network Security | 🇫🇷 Lille | 13 | 2018 |
| 30 | [Sapiologie](https://www.tamtam.ai/c/sapiologie) (sapiologie.com)<br>A sustainability consulting firm offering life cycle analysis to measure environmental, social, and ethical impacts, providing recommendations for sustainable practices | Environmental Services | 🇫🇷 Lille | 12 | 2021 |

## 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 11, 2026.

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## The same list elsewhere in France

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Source: https://www.tamtam.ai/l/professional-services-firms-lille