# List of professional services firms in Catalonia

Tamtam tracks 108 professional services firms headquartered in Catalonia. This list ranks the 50 largest by number of employees on LinkedIn, led by SEIDOR, Nada and Applus+ Idiada. Their median headcount is 574. Half of them were founded in 1996 or later. The most common headquarters are Barcelona (34) and Terrassa (4).

This selection of professional services firms in Catalonia features a mix of established companies and more recent ventures. Autónomo, specializing in LOPD compliance, is notably large. Other significant players include SEIDOR, an IT services and consulting firm, and Cuatrecasas, an international law firm. OCA GLOBAL provides inspection and certification services, while FI Group focuses on managing funding incentives for R&D.

The companies listed are primarily mid-sized to large organizations. A clear pattern is the concentration of headquarters in Barcelona, indicating its role as a central hub for professional services in the region. The sectors represented are diverse, ranging from legal and IT services to design, automotive engineering, and human resources.

🇪🇸 Catalonia · 50 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [SEIDOR](https://www.tamtam.ai/c/seidor) (seidor.com)<br>Helps clients transform and compete through technology and innovation, focusing on human values, sustainability, and partnering with leading tech innovators globally. | IT Services and IT Consulting | 🇪🇸 Barcelona | 8,352 |  |
| 2 | [Nada](https://www.tamtam.ai/c/nada-barcelona) (estudionada.com)<br>An interior architecture and design studio based in Barcelona and Valencia, creating honest, pure, and timeless spaces with a focus on sustainability and functionality | Design Services | 🇪🇸 Barcelona | 3,790 | 2017 |
| 3 | [Applus+ Idiada](https://www.tamtam.ai/c/applus-idiada) (applusidiada.com)<br>Global automotive partner providing design, engineering, testing, homologation, and validation services with advanced facilities and expert professionals worldwide. | Motor Vehicle Manufacturing | 🇪🇸 Santa Oliva | 3,500 | 1971 |
| 4 | [OCA GLOBAL](https://www.tamtam.ai/c/oca-global) (ocaglobal.com)<br>Inspection, quality control, certification, testing, consulting, and training services for diverse industries across multiple countries with international accreditations. | Business Consulting and Services | 🇪🇸 Sant Cugat del Vallès | 3,275 | 2010 |
| 5 | [Cuatrecasas](https://www.tamtam.ai/c/cuatrecasas) (cuatrecasas.com)<br>An international law firm with expertise in business law, serving clients across Spain, Portugal, Latin America, and beyond with a diverse team of over 1,900 professionals | Law Practice | 🇪🇸 Barcelona | 2,540 | 1917 |
| 6 | [FI Group](https://www.tamtam.ai/c/fi-group) (fi-group.us)<br>Global consulting company specializing in managing funding incentives for R&D tax reliefs and grants in 15 countries, helping companies finance innovation and secure funding | Business Consulting and Services | 🇪🇸 Santa Coloma de Cervelló | 2,510 | 2000 |
| 7 | [Profesional Idependiente](https://www.tamtam.ai/c/profesional-idependiente) (cp-barcelona.com)<br>The company offers Coaching Psychology services for individuals, Supervision for coaches and psychologist coaches, and promotes health and leadership competencies | Human Resources Services | 🇪🇸 Barcelona | 2,152 | 2005 |
| 8 | [IMAN GROUP](https://www.tamtam.ai/c/iman-group) (imancorp.es)<br>Provider of comprehensive external services including temporary work, direct recruitment, security, cleaning, reception, training, and consultancy for the food industry, nationally and internationally | Business Consulting and Services | 🇪🇸 Terrassa | 1,823 |  |
| 9 | [MAGMACULTURA, S.L.](https://www.tamtam.ai/c/magmacultura-s-l) (magmacultura.com)<br>MagmaCultura brings together experienced professionals to offer cultural management solutions that optimize resources for tourism, education, and heritage preservation | Museums, Historical Sites, and Zoos | 🇪🇸 Barcelona | 1,500 | 1992 |
| 10 | [OTRA COSA](https://www.tamtam.ai/c/otra-cosa) (gp-grup.com)<br>Specialized expert judicial cabinet providing a wide range of expert opinions and reports across various disciplines in Spain Skilled judicial experts available nationwide | Legal Services | 🇪🇸 Barcelona | 1,415 | 1996 |
| 11 | [Capitole](https://www.tamtam.ai/c/capitole) (capitole-consulting.com)<br>IT consulting company specializing in software development, testing, digital transformation, offering diverse projects, training, team building, and flexible benefits. | IT Services and IT Consulting | 🇪🇸 Barcelona | 1,248 | 2015 |
| 12 | [Grupo Constant](https://www.tamtam.ai/c/grupo-constant) (grupoconstant.com)<br>Leader in HR outsourcing, facilities, and temporary work solutions Specializing in effective, innovative services, focusing on quality, authenticity, respect, and efficiency | Human Resources Services | 🇪🇸 Barcelona | 1,041 | 1987 |
| 13 | [SDG Group España](https://www.tamtam.ai/c/sdg-group-espana) (sdggroup.com)<br>Global consulting firm specializing in Data & Analytics, transforming organizations into successful data-driven enterprises through innovative analytics expertise and solutions | Business Consulting and Services | 🇪🇸 Barcelona | 974 | 1992 |
| 14 | [ASPY Prevención](https://www.tamtam.ai/c/aspy-prevencion) (aspyprevencion.com)<br>Specializing in occupational health and safety, the company offers tailored solutions to ensure compliance and promote excellence in prevention | Business Consulting and Services | 🇪🇸 Barcelona | 885 |  |
| 15 | [Eurecat - Technology Centre](https://www.tamtam.ai/c/eurecat-technology-centre) (eurecat.org)<br>Leading technological center offering R&D, technological services, specialized training, consultancy, and industrial property exploitation for businesses of all sizes and sectors | Research Services | 🇪🇸 Cerdanyola del Vallès | 869 | 2013 |
| 16 | [Marlex](https://www.tamtam.ai/c/marlex) (marlex.net)<br>A leading professional services firm specializing in HR solutions, offering Interim, Recruiting, and Executive services with over 25 years of experience | Human Resources Services | 🇪🇸 Girona | 852 |  |
| 17 | [SYNERGIE ESPAÑA](https://www.tamtam.ai/c/synergie-espana) (synergie.es)<br>A multinational company specializing in comprehensive HR services, offering temporary work, recruitment, training, and outsourcing with a strong presence in Europe and other countries | Staffing and Recruiting | 🇪🇸 Barcelona | 813 | 1996 |
| 18 | [Between Technology](https://www.tamtam.ai/c/between-technology) (between.tech)<br>Connecting skilled professionals with innovative engineering and IT projects worldwide, providing consulting services and fostering career development opportunities. | IT Services and IT Consulting | 🇪🇸 Barcelona | 759 | 2000 |
| 19 | [Multiplica](https://www.tamtam.ai/c/multiplica) (multiplica.com)<br>Digital consulting firm specializing in creating impactful digital experiences by utilizing cutting-edge technologies and methodologies to improve business results and user connections | IT Services and IT Consulting | 🇪🇸 Barcelona | 736 | 2000 |
| 20 | [Ingenieros Emetres (Im3)](https://www.tamtam.ai/c/ingenieros-emetres-im3) (ingenieros-im3.com)<br>The company provides engineering services such as studies, design, construction management, and legalization, with a focus on multidisciplinary teams and industry trends | Business Consulting and Services | 🇪🇸 Barcelona | 672 | 1981 |
| 21 | [Forvis Mazars in Spain](https://www.tamtam.ai/c/forvis-mazars-in-spain) (forvismazars.com)<br>An international firm providing audit, consulting, legal, and tax advisory services, committed to helping clients and professionals succeed while promoting trust and responsibility | Business Consulting and Services | 🇪🇸 Barcelona | 640 |  |
| 22 | [Roman](https://www.tamtam.ai/c/roman) (romanrm.com)<br>A communication and PR agency with 30 years experience specializing in reputation management through various communication strategies in local, national, and international markets | Public Relations and Communications Services | 🇪🇸 Barcelona | 623 | 1989 |
| 23 | [TYLin in Europe + LATAM](https://www.tamtam.ai/c/tylin-in-europe-latam) (tylin.com)<br>Designs infrastructure solutions globally, connecting communities, enhancing designs, providing resilient systems, and offering sustainable solutions to client challenges. | Civil Engineering | 🇪🇸 Barcelona | 582 | 1954 |
| 24 | [Human Resources by Sede21](https://www.tamtam.ai/c/human-resources-by-sede21) (sede21.com)<br>A global company based in Barcelona, emphasizing results, service, and sensibility in delivering its products or services worldwide | Human Resources Services | 🇪🇸 Barcelona | 577 | 2005 |
| 25 | [RSM Spain](https://www.tamtam.ai/c/rsm-spain) (rsm.es)<br>Leading audit, tax, and legal advisory and consulting firm. Serves local and multinational companies, focusing on client understanding and challenges. | Professional Services | 🇪🇸 Barcelona | 574 | 1975 |
| 26 | [Diagonal Gest, SL](https://www.tamtam.ai/c/diagonal-gest-sl) (diagonalcompany.com)<br>A company founded in 1997 focusing initially on mortgage management, now a leading provider of advanced financial process outsourcing services internationally | Outsourcing and Offshoring Consulting | 🇪🇸 Barcelona | 571 |  |
| 27 | [GDE - Grupo de Desarrollo Empresarial I+D+i, S.L.](https://www.tamtam.ai/c/gde-grupo-de-desarrollo-empresarial-i-d-i-s-l) (gde7.com)<br>Specialized in providing collaboration services for R&D projects, offering technical solutions, project development, funding facilitation, and assistance with PATENT BOX applications | Research Services | 🇪🇸 Terrassa | 541 | 2003 |
| 28 | [SOCOTEC Spain](https://www.tamtam.ai/c/socotec-spain) (socotec.es)<br>Offering comprehensive engineering solutions to ensure reliability, digitization, and sustainability throughout the infrastructure lifecycle, aiming to transform the world through innovative and responsible engineering | Engineering Services | 🇪🇸 Barcelona | 481 | 2013 |
| 29 | [Leitat Technological Center](https://www.tamtam.ai/c/leitat-technological-center) (leitat.org)<br>Technology center focused on applied research, technical services, and innovation management, providing comprehensive solutions across diverse sectors including health, materials, and sustainability. | Research Services | 🇪🇸 Terrassa | 466 | 1906 |
| 30 | [Nae](https://www.tamtam.ai/c/nae) (nae.global)<br>A consulting firm specializing in business strategy and efficiency for telecom, corporations, and public entities, with a focus on customer experience innovation | Business Consulting and Services | 🇪🇸 Barcelona | 458 | 2004 |
| 31 | [Idneo](https://www.tamtam.ai/c/idneo) (idneo.com)<br>Engineering service company specializing in design, development, certification, and manufacturing of high-value products across various markets globally. | Appliances, Electrical, and Electronics Manufacturing | 🇪🇸 Mollet del Vallès | 450 | 2011 |
| 32 | [Iplan Gestión Integral](https://www.tamtam.ai/c/iplan-gestion-integral) (iplangroup-eng.com)<br>A company offering engineering services in energy, civil works, renewable energies, and environment, with a focus on integral project execution | Engineering Services | 🇪🇸 Barcelona | 443 | 2008 |
| 33 | [Broadcaster](https://www.tamtam.ai/c/broadcaster) (vpn.broadcaster.media)<br>A content agency specializing in integrated communication, storytelling, audiovisual production, and journalism to help companies convey authentic, impactful messages | Media Production | 🇪🇸 Barcelona | 438 | 1991 |
| 34 | [Amphos 21](https://www.tamtam.ai/c/amphos-21) (amphos21.com)<br>Environmental consulting and engineering company offering services in mining, nuclear, water, environment, and sustainability sectors worldwide, with expertise in hydrogeochemical modeling and R&D | Environmental Services | 🇪🇸 Barcelona | 428 | 1994 |
| 35 | [Crowe Spain](https://www.tamtam.ai/c/crowe-spain) (crowe.es)<br>Global professional services provider with presence in over 150 countries and 40,000 professionals Offers tailored solutions combining international expertise with local knowledge | Professional Services | 🇪🇸 Barcelona | 405 | 1920 |
| 36 | [IDP Ingeniería, Medio ambiente y Arquitectura](https://www.tamtam.ai/c/idp-ingenieria-medio-ambiente-y-arquitectura) (idp.es)<br>Provides global technical services in engineering, environment, architecture, and IT, using BIM for project design, organization, and management. | Civil Engineering | 🇪🇸 Sabadell | 397 | 1998 |
| 37 | [Cero](https://www.tamtam.ai/c/cero) (wearecero.com)<br>A multidisciplinary design studio in Barcelona merging design, engineering, simulation, composite, and testing for various industries, focusing on lightweight design using cutting-edge technologies | Engineering Services | 🇪🇸 Barcelona | 396 | 2010 |
| 38 | [Winche Redes Comerciales](https://www.tamtam.ai/c/winche-redes-comerciales) (winche.com)<br>Specialists in sales force outsourcing & point of sale management Increase client sales through tailored projects, product visibility improvement, cost reduction, flexibility, and expertise | Advertising Services | 🇪🇸 Barcelona | 391 | 2002 |
| 39 | [AESA](https://www.tamtam.ai/c/aesa) (aesa.net)<br>Energy engineering and consulting focused on high-efficiency solutions, specializing in cogeneration, biomass, and waste energy valorization Expert teams ensure successful project outcomes | Engineering Services | 🇪🇸 Barcelona | 387 | 1981 |
| 40 | [JG Ingenieros S.A.](https://www.tamtam.ai/c/jg-ingenieros-s-a) (jgingenieros.es)<br>An independent engineering company specializing in construction, with expertise in building and electrical/mechanical installations Offers comprehensive engineering services from concept to maintenance | Construction | 🇪🇸 Barcelona | 384 | 1970 |
| 41 | [LÁ NA FIRMA](https://www.tamtam.ai/c/la-na-firma) (lanafirma.page)<br>Consulting firm specializing in People Management and Communication Innovation Services include Employer Branding, Employee Experience, Talent Acquisition, Development, Change Management, Culture, and Marketing | Business Consulting and Services | 🇪🇸 Barcelona | 380 | 2019 |
| 42 | [Basetis](https://www.tamtam.ai/c/basetis) (basetis.com)<br>Specialists in data management, AI, design, app development, IT infrastructures, project management, video games, and legal ICT advice | IT Services and IT Consulting | 🇪🇸 Barcelona | 371 | 2009 |
| 43 | [Laboral Group](https://www.tamtam.ai/c/laboral-group) (laboralgroup.com)<br>A national company specializing in legal compliance solutions for businesses, offering tailored services in workplace safety, data protection, and food safety | Business Consulting and Services | 🇪🇸 Lleida | 358 | 2013 |
| 44 | [Conversia Consulting Group](https://www.tamtam.ai/c/conversia-consulting-group) (conversia.es)<br>Consulting and training services for SMEs and professionals focused on compliance with data protection and digital communication regulations in Spain. | Business Consulting and Services | 🇪🇸 Riudellots de la Selva | 347 | 2007 |
| 45 | [RUCKER LYPSA](https://www.tamtam.ai/c/rucker-lypsa) (edag.com)<br>A global leader in engineering for the transportation industry, specializing in automotive and commercial vehicles, offering solutions for vehicle development, production, and electrical/electronic systems | Motor Vehicle Manufacturing | 🇪🇸 Cornellà de Llobregat | 344 |  |
| 46 | [RocaJunyent](https://www.tamtam.ai/c/rocajunyent) (rocajunyent.com)<br>Provides expert legal advice in commercial, banking, financial, procedural, and tax law with a strong international reputation. | Law Practice | 🇪🇸 Barcelona | 344 | 1996 |
| 47 | [Anthesis Esp](https://www.tamtam.ai/c/anthesis-esp) (anthesisgroup.com)<br>A sustainability services company based in Barcelona, offering consulting on energy efficiency, climate change, renewable energy, sustainable building, social responsibility, and environmental services | Environmental Services | 🇪🇸 Manlleu | 322 | 1981 |
| 48 | [Telstar](https://www.tamtam.ai/c/telstar) (telstar.com)<br>Engineering, construction, and integrated process equipment provider specializing in GMP consultancy and aseptic solutions for life sciences, pharmaceutical, biotechnology, and healthcare industries worldwide. | Machinery Manufacturing | 🇪🇸 Terrassa | 321 | 1963 |
| 49 | [Quadrante Meta Engineering](https://www.tamtam.ai/c/quadrante-meta-engineering) (metaengineering.com)<br>Global provider of consulting and engineering services specializing in Transport Infrastructure Offers customized services throughout project lifecycle on 5 continents | Civil Engineering | 🇪🇸 Barcelona | 312 | 1979 |
| 50 | [TAX Economistas y Abogados](https://www.tamtam.ai/c/tax-economistas-y-abogados) (tax.es)<br>A group of 50 professionals with over 35 years of experience providing personalized tax, legal, accounting, auditing, and insurance services to businesses of all sizes | Business Consulting and Services | 🇪🇸 Figueres | 278 | 1988 |

## 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.

## More company lists in Catalonia

- [The largest companies in Catalonia](https://www.tamtam.ai/l/largest-companies-catalonia) (2,850)
- [Multinational companies in Catalonia](https://www.tamtam.ai/l/multinational-companies-catalonia) (680)
- [Retail chains in Catalonia](https://www.tamtam.ai/l/retail-chains-catalonia) (334)
- [Companies with in-house R&D in Catalonia](https://www.tamtam.ai/l/r-and-d-companies-catalonia) (324)
- [Manufacturers in Catalonia](https://www.tamtam.ai/l/manufacturers-catalonia) (309)
- [Wellness and Fitness Services companies in Catalonia](https://www.tamtam.ai/l/wellness-and-fitness-services-companies-catalonia) (232)
- [Healthcare providers in Catalonia](https://www.tamtam.ai/l/healthcare-providers-catalonia) (193)
- [Software Development companies in Catalonia](https://www.tamtam.ai/l/software-development-companies-catalonia) (174)
- [SaaS companies in Catalonia](https://www.tamtam.ai/l/saas-companies-catalonia) (167)
- [Companies with a mobile app in Catalonia](https://www.tamtam.ai/l/companies-with-mobile-app-catalonia) (161)
- [Hotel and hospitality groups in Catalonia](https://www.tamtam.ai/l/hospitality-groups-catalonia) (152)
- [Retail Apparel and Fashion companies in Catalonia](https://www.tamtam.ai/l/retail-apparel-and-fashion-companies-catalonia) (148)
- [Family-owned companies in Catalonia](https://www.tamtam.ai/l/family-owned-companies-catalonia) (148)
- [E-commerce companies in Catalonia](https://www.tamtam.ai/l/ecommerce-companies-catalonia) (140)
- [Hardware manufacturers in Catalonia](https://www.tamtam.ai/l/hardware-companies-catalonia) (130)
- [Hospitality companies in Catalonia](https://www.tamtam.ai/l/hospitality-companies-catalonia) (124)
- [Education providers in Catalonia](https://www.tamtam.ai/l/education-companies-catalonia) (121)
- [Transportation, Logistics, Supply Chain and Storage companies in Catalonia](https://www.tamtam.ai/l/transportation-logistics-supply-chain-and-storage-companies-catalonia) (120)
- [Critical infrastructure operators in Catalonia](https://www.tamtam.ai/l/critical-infrastructure-operators-catalonia) (115)
- [Distributors and wholesalers in Catalonia](https://www.tamtam.ai/l/distributors-and-wholesalers-catalonia) (110)
- [Consumer goods companies in Catalonia](https://www.tamtam.ai/l/consumer-goods-companies-catalonia) (104)
- [Food and Beverage Services companies in Catalonia](https://www.tamtam.ai/l/food-and-beverage-services-companies-catalonia) (103)
- [IT Services and IT Consulting companies in Catalonia](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-catalonia) (96)
- [IT services companies in Catalonia](https://www.tamtam.ai/l/it-services-companies-catalonia) (95)

## The same list elsewhere in Spain

- [Professional services firms in Spain](https://www.tamtam.ai/l/professional-services-firms-spain) (522)
- [Professional services firms in Community of Madrid](https://www.tamtam.ai/l/professional-services-firms-community-of-madrid) (273)
- [Professional services firms in Andalusia](https://www.tamtam.ai/l/professional-services-firms-andalusia) (29)
- [Professional services firms in Madrid](https://www.tamtam.ai/l/professional-services-firms-madrid) (227)
- [Professional services firms in Barcelona](https://www.tamtam.ai/l/professional-services-firms-barcelona) (81)

## 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) (13,698)

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