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.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
SEIDORseidor.com
Helps clients transform and compete through technology and innovation, focusing on human values, sustainability, and partnering with leading tech innovators globally. |
8,352 | |||
| 2 |
Nadaestudionada.com
An interior architecture and design studio based in Barcelona and Valencia, creating honest, pure, and timeless spaces with a focus on sustainability and functionality |
3,790 | |||
| 3 |
Applus+ Idiadaapplusidiada.com
Global automotive partner providing design, engineering, testing, homologation, and validation services with advanced facilities and expert professionals worldwide. |
3,500 | |||
| 4 |
OCA GLOBALocaglobal.com
Inspection, quality control, certification, testing, consulting, and training services for diverse industries across multiple countries with international accreditations. |
3,275 | |||
| 5 |
Cuatrecasascuatrecasas.com
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 |
2,540 | |||
| 6 |
FI Groupfi-group.us
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 |
2,510 | |||
| 7 | 
Profesional Idependientecp-barcelona.com
The company offers Coaching Psychology services for individuals, Supervision for coaches and psychologist coaches, and promotes health and leadership competencies |
2,152 | |||
| 8 |
IMAN GROUPimancorp.es
Provider of comprehensive external services including temporary work, direct recruitment, security, cleaning, reception, training, and consultancy for the food industry, nationally and internationally |
1,823 | |||
| 9 |
MAGMACULTURA, S.L.magmacultura.com
MagmaCultura brings together experienced professionals to offer cultural management solutions that optimize resources for tourism, education, and heritage preservation |
1,500 | |||
| 10 |
OTRA COSAgp-grup.com
Specialized expert judicial cabinet providing a wide range of expert opinions and reports across various disciplines in Spain Skilled judicial experts available nationwide |
1,415 | |||
| 11 |
Capitolecapitole-consulting.com
IT consulting company specializing in software development, testing, digital transformation, offering diverse projects, training, team building, and flexible benefits. |
1,248 | |||
| 12 |
Grupo Constantgrupoconstant.com
Leader in HR outsourcing, facilities, and temporary work solutions Specializing in effective, innovative services, focusing on quality, authenticity, respect, and efficiency |
1,041 | |||
| 13 |
SDG Group Españasdggroup.com
Global consulting firm specializing in Data & Analytics, transforming organizations into successful data-driven enterprises through innovative analytics expertise and solutions |
974 | |||
| 14 |
ASPY Prevenciónaspyprevencion.com
Specializing in occupational health and safety, the company offers tailored solutions to ensure compliance and promote excellence in prevention |
885 | |||
| 15 |
Eurecat - Technology Centreeurecat.org
Leading technological center offering R&D, technological services, specialized training, consultancy, and industrial property exploitation for businesses of all sizes and sectors |
869 | |||
| 16 |
Marlexmarlex.net
A leading professional services firm specializing in HR solutions, offering Interim, Recruiting, and Executive services with over 25 years of experience |
852 | |||
| 17 |
SYNERGIE ESPAÑAsynergie.es
A multinational company specializing in comprehensive HR services, offering temporary work, recruitment, training, and outsourcing with a strong presence in Europe and other countries |
813 | |||
| 18 |
Between Technologybetween.tech
Connecting skilled professionals with innovative engineering and IT projects worldwide, providing consulting services and fostering career development opportunities. |
759 | |||
| 19 |
Multiplicamultiplica.com
Digital consulting firm specializing in creating impactful digital experiences by utilizing cutting-edge technologies and methodologies to improve business results and user connections |
736 | |||
| 20 |
Ingenieros Emetres (Im3)ingenieros-im3.com
The company provides engineering services such as studies, design, construction management, and legalization, with a focus on multidisciplinary teams and industry trends |
672 | |||
| 21 |
Forvis Mazars in Spainforvismazars.com
An international firm providing audit, consulting, legal, and tax advisory services, committed to helping clients and professionals succeed while promoting trust and responsibility |
640 | |||
| 22 |
Romanromanrm.com
A communication and PR agency with 30 years experience specializing in reputation management through various communication strategies in local, national, and international markets |
623 | |||
| 23 |
TYLin in Europe + LATAMtylin.com
Designs infrastructure solutions globally, connecting communities, enhancing designs, providing resilient systems, and offering sustainable solutions to client challenges. |
582 | |||
| 24 |
Human Resources by Sede21sede21.com
A global company based in Barcelona, emphasizing results, service, and sensibility in delivering its products or services worldwide |
577 | |||
| 25 | 574 | ||||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 26 |
Diagonal Gest, SLdiagonalcompany.com
A company founded in 1997 focusing initially on mortgage management, now a leading provider of advanced financial process outsourcing services internationally |
571 | |||
| 27 |
GDE - Grupo de Desarrollo Empresarial I+D+i, S.L.gde7.com
Specialized in providing collaboration services for R&D projects, offering technical solutions, project development, funding facilitation, and assistance with PATENT BOX applications |
541 | |||
| 28 |
SOCOTEC Spainsocotec.es
Offering comprehensive engineering solutions to ensure reliability, digitization, and sustainability throughout the infrastructure lifecycle, aiming to transform the world through innovative and responsible engineering |
481 | |||
| 29 |
Leitat Technological Centerleitat.org
Technology center focused on applied research, technical services, and innovation management, providing comprehensive solutions across diverse sectors including health, materials, and sustainability. |
466 | |||
| 30 |
Naenae.global
A consulting firm specializing in business strategy and efficiency for telecom, corporations, and public entities, with a focus on customer experience innovation |
458 | |||
| 31 | 450 | ||||
| 32 |
Iplan Gestión Integraliplangroup-eng.com
A company offering engineering services in energy, civil works, renewable energies, and environment, with a focus on integral project execution |
443 | |||
| 33 |
Broadcastervpn.broadcaster.media
A content agency specializing in integrated communication, storytelling, audiovisual production, and journalism to help companies convey authentic, impactful messages |
438 | |||
| 34 |
Amphos 21amphos21.com
Environmental consulting and engineering company offering services in mining, nuclear, water, environment, and sustainability sectors worldwide, with expertise in hydrogeochemical modeling and R&D |
428 | |||
| 35 |
Crowe Spaincrowe.es
Global professional services provider with presence in over 150 countries and 40,000 professionals Offers tailored solutions combining international expertise with local knowledge |
405 | |||
| 36 |
IDP Ingeniería, Medio ambiente y Arquitecturaidp.es
Provides global technical services in engineering, environment, architecture, and IT, using BIM for project design, organization, and management. |
397 | |||
| 37 |
Cerowearecero.com
A multidisciplinary design studio in Barcelona merging design, engineering, simulation, composite, and testing for various industries, focusing on lightweight design using cutting-edge technologies |
396 | |||
| 38 |
Winche Redes Comercialeswinche.com
Specialists in sales force outsourcing & point of sale management Increase client sales through tailored projects, product visibility improvement, cost reduction, flexibility, and expertise |
391 | |||
| 39 | 387 | ||||
| 40 |
JG Ingenieros S.A.jgingenieros.es
An independent engineering company specializing in construction, with expertise in building and electrical/mechanical installations Offers comprehensive engineering services from concept to maintenance |
384 | |||
| 41 |
LÁ NA FIRMAlanafirma.page
Consulting firm specializing in People Management and Communication Innovation Services include Employer Branding, Employee Experience, Talent Acquisition, Development, Change Management, Culture, and Marketing |
380 | |||
| 42 |
Basetisbasetis.com
Specialists in data management, AI, design, app development, IT infrastructures, project management, video games, and legal ICT advice |
371 | |||
| 43 |
Laboral Grouplaboralgroup.com
A national company specializing in legal compliance solutions for businesses, offering tailored services in workplace safety, data protection, and food safety |
358 | |||
| 44 |
Conversia Consulting Groupconversia.es
Consulting and training services for SMEs and professionals focused on compliance with data protection and digital communication regulations in Spain. |
347 | |||
| 45 |
RUCKER LYPSAedag.com
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 |
344 | |||
| 46 |
RocaJunyentrocajunyent.com
Provides expert legal advice in commercial, banking, financial, procedural, and tax law with a strong international reputation. |
344 | |||
| 47 |
Anthesis Espanthesisgroup.com
A sustainability services company based in Barcelona, offering consulting on energy efficiency, climate change, renewable energy, sustainable building, social responsibility, and environmental services |
322 | |||
| 48 |
Telstartelstar.com
Engineering, construction, and integrated process equipment provider specializing in GMP consultancy and aseptic solutions for life sciences, pharmaceutical, biotechnology, and healthcare industries worldwide. |
321 | |||
| 49 |
Quadrante Meta Engineeringmetaengineering.com
Global provider of consulting and engineering services specializing in Transport Infrastructure Offers customized services throughout project lifecycle on 5 continents |
312 | |||
| 50 |
TAX Economistas y Abogadostax.es
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 |
278 | |||
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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 2,850
- Multinational companies in Catalonia 680
- Retail chains in Catalonia 334
- Companies with in-house R&D in Catalonia 324
- Manufacturers in Catalonia 309
- Wellness and Fitness Services companies in Catalonia 232
- Healthcare providers in Catalonia 193
- Software Development companies in Catalonia 174
- SaaS companies in Catalonia 167
- Companies with a mobile app in Catalonia 161
- Hotel and hospitality groups in Catalonia 152
- Retail Apparel and Fashion companies in Catalonia 148
- Family-owned companies in Catalonia 148
- E-commerce companies in Catalonia 140
- Hardware manufacturers in Catalonia 130
- Hospitality companies in Catalonia 124
- Education providers in Catalonia 121
- Transportation, Logistics, Supply Chain and Storage companies in Catalonia 120
- Critical infrastructure operators in Catalonia 115
- Distributors and wholesalers in Catalonia 110
- Consumer goods companies in Catalonia 104
- Food and Beverage Services companies in Catalonia 103
- IT Services and IT Consulting companies in Catalonia 96
- IT services companies in Catalonia 95
The same list elsewhere in Spain
- Professional services firms in Spain 522
- Professional services firms in Community of Madrid 273
- Professional services firms in Andalusia 29
- Professional services firms in Madrid 227
- Professional services firms in Barcelona 81