# 30 leading consulting firms in the Bouches-du-Rhône department

Tamtam tracks 129 consulting firms headquartered in the Bouches-du-Rhône department. This list ranks the 30 largest by number of employees on LinkedIn, led by Sonovision - Ortec Group, Klanik and Key Performance Consulting (KPC). Their median headcount is 143. Half of them were founded in 2009 or later. The most common headquarters are Aix-en-Provence (12), Marseille (12) and Venelles (2).

These are the largest consulting firms in Bouches-du-Rhône. Many are IT services and IT consulting firms, such as Klanik, which assists with digital projects, and Key Performance Consulting, which offers technology consulting. Other firms include setec international, specializing in transport infrastructure, and ECP - Project Management .INtelligence, focused on project management for industrial sectors. The firms listed are mostly mid-sized companies.

The companies are clustered in a few cities. Aix-en-Provence is home to Sonovision - Ortec Group, Key Performance Consulting, ECP, and ARKADIA Group. Marseille also has a significant presence with Klanik, iQanto, and Seres Technologies. The data shows a strong concentration of companies founded in the late 2000s and early 2010s, indicating a period of growth for the consulting sector in the region.

🇫🇷 Bouches-du-Rhône · 30 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Sonovision - Ortec Group](https://www.tamtam.ai/c/sonovision-ortec-group) (sonovisiongroup.com)<br>Experts process complex systems content, enriching products with innovative solutions throughout their lifecycle, from design to technical content and training for optimized field operations. | Engineering Services | 🇫🇷 Aix-en-Provence | 568 |  |
| 2 | [Klanik](https://www.tamtam.ai/c/klanik) (klanik.com)<br>Provides IT engineering consulting, assisting partners with digital and technological projects, leveraging expert talent across various technological verticals globally for digital transformation. | IT Services and IT Consulting | 🇫🇷 Marseille | 548 | 2011 |
| 3 | [Key Performance Consulting (KPC)](https://www.tamtam.ai/c/key-performance-consulting-kpc) (keyperformance-consulting.com)<br>Global player in upstream and integration phases for systems, offering technology consulting and services for large project integration and business process improvement. | IT Services and IT Consulting | 🇫🇷 Aix-en-Provence | 474 | 2010 |
| 4 | [setec international](https://www.tamtam.ai/c/setec-international) (inter.setec.fr)<br>Engineering consultancy specializing in transport infrastructure projects including feasibility, design, environmental studies, and project management across France and internationally. | Civil Engineering | 🇫🇷 Vitrolles | 446 |  |
| 5 | [iQanto](https://www.tamtam.ai/c/iqanto) (iqanto.net)<br>Industrial transformation through automation, robotics, AI, and cybersecurity to improve processes and deploy intelligent systems across diverse sectors for small and large enterprises. | IT Services and IT Consulting | 🇫🇷 Marseille | 349 |  |
| 6 | [ECP - Project Management .INtelligence](https://www.tamtam.ai/c/ecp-project-management-intelligence) (assystem.com)<br>Project Management Consulting Group specializing in Oil & Gas, Nuclear, Energy, Defense, Infrastructures, Chemistry, Metallurgy sectors Services include project management, cost estimation, risk management, and more | Business Consulting and Services | 🇫🇷 Aix-en-Provence | 287 |  |
| 7 | [Altereo](https://www.tamtam.ai/c/altereo) (altereo.fr)<br>An independent French company driving clients from ideas to behaviors, specializing in water engineering, public utility management, city sustainability, and geographic intelligence solutions | Environmental Services | 🇫🇷 Venelles | 229 | 1989 |
| 8 | [Seres Technologies](https://www.tamtam.ai/c/seres-technologies) (seres-technologies.com)<br>Specializes in risk management, complex systems design, and R&D, supporting industries like mobility, defense, and energy with comprehensive safety and security solutions. | Business Consulting and Services | 🇫🇷 Marseille | 220 | 2009 |
| 9 | [ARKADIA Group](https://www.tamtam.ai/c/arkadia-group) (arkadiagroup.fr)<br>ARKADIA Group is an independent engineering and services firm specializing in Energy and Aerospace/Transport sectors, offering expertise in large industrial projects worldwide | Business Consulting and Services | 🇫🇷 Aix-en-Provence | 214 | 2010 |
| 10 | [IMPAC Ingénierie (MPA Group)](https://www.tamtam.ai/c/impac-ingenierie-mpa-group) (impac-ingenierie.com)<br>Engineering consulting firm supporting major industrial sectors with project lifecycle guidance, local presence, and expert teams across France. | Engineering Services | 🇫🇷 Grans | 183 | 1988 |
| 11 | [ADNOV](https://www.tamtam.ai/c/adnov) (adnov.fr)<br>ADNOV, part of ADSN Group, specializes in providing innovative solutions for notaries including secure networks, data protection, cybersecurity, real estate, and client relations | IT Services and IT Consulting | 🇫🇷 Venelles | 171 | 2018 |
| 12 | [Ekstend Group](https://www.tamtam.ai/c/ekstend-group) (lokall.com)<br>Independent marketing group supporting brand transformation and strategy deployment with expertise in digital, branding, media, innovation, and event services. | Advertising Services | 🇫🇷 Marseille | 167 |  |
| 13 | [REACTIS Group](https://www.tamtam.ai/c/reactis-group) (reactis.fr)<br>Company helps businesses with IT projects, software development, systems maintenance, digital transformation, and application services through various flexible intervention modes. | IT Services and IT Consulting | 🇫🇷 Aix-en-Provence | 163 | 2001 |
| 14 | [JLB Expertises](https://www.tamtam.ai/c/jlb-expertises) (jlbexpertises.com)<br>A French survey company specializing in agricultural and food products in West Africa, with expertise in cocoa, coffee, rice, and cargo surveys | Maritime Transportation | 🇫🇷 Marseille | 153 | 1883 |
| 15 | [Sonergia](https://www.tamtam.ai/c/sonergia) (sonergia.fr)<br>Located in Marseille since 2009, this company supports energy suppliers in meeting government-set energy reduction goals through energy efficiency renovations for consumers | Environmental Services | 🇫🇷 Marseille | 143 | 2009 |
| 16 | [ARIAL Industries](https://www.tamtam.ai/c/arial-industries) (arial-industries.com)<br>ARIAL Industries is an engineering company specializing in mechanical, electrical/electronic, and embedded systems for clients in aerospace, nuclear, automotive, and space industries | Engineering Services | 🇫🇷 Aix-en-Provence | 141 | 2001 |
| 17 | [Team-iT](https://www.tamtam.ai/c/team-it) (team-it.fr)<br>Specialized in IT infrastructure, cybersecurity, DevOps, cloud, project management, and ITIL process management for large corporate clients. | IT Services and IT Consulting | 🇫🇷 Aix-en-Provence | 135 | 2014 |
| 18 | [C2C CONSEILS](https://www.tamtam.ai/c/c2c-conseils) (c2c-conseils.com)<br>Groupe C2C AUDIT is a multi-generational team of accounting experts with diverse skills, experience, human qualities, and technological proficiency | Accounting | 🇫🇷 Marseille | 124 | 2004 |
| 19 | [Reel IT Groupe](https://www.tamtam.ai/c/reel-it-groupe) (reelit.fr)<br>REEL IT Group, founded by digital transformation experts, offers a diverse range of solutions to drive businesses forward through digital transformation | Computer Networking Products | 🇫🇷 Aix-en-Provence | 120 | 2019 |
| 20 | [Amesys Conseil](https://www.tamtam.ai/c/amesys-conseil) (amesys-conseil.fr)<br>Consulting and industrial group specializing in Defense & aerospace, aeronautics, transportation, RF, and homeland security markets with consistent growth and profitability | IT Services and IT Consulting | 🇫🇷 Aix-en-Provence | 118 | 1979 |
| 21 | [PRINCIPIA](https://www.tamtam.ai/c/principia) (principia-group.com)<br>PRINCIPIA provides top-class engineering services, specializing in sustainable development and offering innovative, cost-effective solutions for large EPCI projects since 1981 | Engineering Services | 🇫🇷 La Ciotat | 114 | 1981 |
| 22 | [Dev-id](https://www.tamtam.ai/c/dev-id) (dev-id.fr)<br>It is a network of digital makers specializing in creating innovative digital products and training future members through an academy. | Software Development | 🇫🇷 Marseille | 109 | 2017 |
| 23 | [Netsystem](https://www.tamtam.ai/c/netsystem) (netsystem.fr)<br>Netsystem is an IT consulting company specializing in digital transformation and information systems strategy, offering services in digital trust and digital transformation across various industries | IT Services and IT Consulting | 🇫🇷 Aix-en-Provence | 100 | 2003 |
| 24 | [Stan](https://www.tamtam.ai/c/stan) (stanfrance.com)<br>A leading French territorial influence consulting firm established in 2013, connecting private companies with key stakeholders to implement projects aligned with local development goals | Public Relations and Communications Services | 🇫🇷 Marseille | 86 | 2013 |
| 25 | [thecamp](https://www.tamtam.ai/c/thecamp) (thecamp.fr)<br>Shapes a human, responsible, and sustainable world, bringing together companies, governments, territories, and individuals to tackle challenges and co-create future socio-economic models. | Events Services | 🇫🇷 Aix-en-Provence | 85 | 2017 |
| 26 | [TEREA](https://www.tamtam.ai/c/terea) (terea.net)<br>Professional environmental consulting company specializing in sustainable management of natural resources, conducting Environmental Impact Assessments, ecological inventories, and providing environmental expertise to various industries globally | Environmental Services | 🇫🇷 Marseille | 84 | 2004 |
| 27 | [Crowe Ficorec](https://www.tamtam.ai/c/crowe-ficorec) (crowe.com)<br>A global service provider offering financial accounting, audit, advisory, tax, risk consulting, and internal audit services to companies across all industries | Accounting | 🇫🇷 Marseille | 79 | 1987 |
| 28 | [AXONE](https://www.tamtam.ai/c/axone) (axonegroup.com)<br>Expertise in complex system architecture and safety, focusing on sustainable industrial optimization to balance ecology and technology for clients. | Business Consulting and Services | 🇫🇷 Meyreuil | 77 | 2016 |
| 29 | [Season](https://www.tamtam.ai/c/season) (season-ed.com)<br>Development of agile, Salesforce-based cloud software solutions for higher education institutions focusing on contact and interaction management. | IT Services and IT Consulting | 🇫🇷 Aix-en-Provence | 71 | 2018 |
| 30 | [Agence d'urbanisme de l'agglomération marseillaise (Agam)](https://www.tamtam.ai/c/agence-d-urbanisme-de-l-agglomeration-marseillaise-agam) (agam.org)<br>The urban planning agency in Marseille provides studies, data, and analysis for public policy development, promoting collaboration and coordination among stakeholders | Architecture and Planning | 🇫🇷 Marseille | 71 | 1969 |

## 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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- [Consulting firms in Nouvelle-Aquitaine](https://www.tamtam.ai/l/consulting-firms-nouvelle-aquitaine) (166)
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Source: https://www.tamtam.ai/l/consulting-firms-bouches-du-rhone