# The 30 largest professional services firms in Barcelona
Tamtam tracks 81 professional services firms headquartered in Barcelona. This list ranks the 30 largest by number of employees on LinkedIn, led by SEIDOR, Nada and Cuatrecasas. Their median headcount is 640. Half of them were founded in 1996 or later.
These Barcelona-based professional services firms are mostly large and mid-sized companies, with a focus on IT services, business consulting, and legal practices. For example, SEIDOR helps clients with technology and innovation, while Cuatrecasas is an international law firm. Nada specializes in interior architecture and design, and MAGMACULTURA, S.L. offers cultural management solutions. Profesional Idependiente provides coaching psychology services, and OTRA COSA offers expert judicial opinions.
A notable pattern among these companies is their specialization in various professional services, with a strong presence of IT consulting firms like Capitole and Between Technology, and human resources specialists such as Grupo Constant and SYNERGIE ESPAรA. Many of these firms were founded in the 1990s and early 2000s, indicating a period of growth in the professional services sector in Barcelona.
๐ช๐ธ Barcelona ยท 30 companies ยท Updated Nov 11, 2026
| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [SEIDOR](https://www.tamtam.ai/c/seidor) (seidor.com)
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 | ๐ช๐ธ Barcelona | 8,352 | |
| 2 | [Nada](https://www.tamtam.ai/c/nada-barcelona) (estudionada.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 | Design Services | ๐ช๐ธ Barcelona | 3,790 | 2017 |
| 3 | [Cuatrecasas](https://www.tamtam.ai/c/cuatrecasas) (cuatrecasas.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 | Law Practice | ๐ช๐ธ Barcelona | 2,540 | 1917 |
| 4 | [Profesional Idependiente](https://www.tamtam.ai/c/profesional-idependiente) (cp-barcelona.com)
The company offers Coaching Psychology services for individuals, Supervision for coaches and psychologist coaches, and promotes health and leadership competencies | Human Resources Services | ๐ช๐ธ Barcelona | 2,152 | 2005 |
| 5 | [MAGMACULTURA, S.L.](https://www.tamtam.ai/c/magmacultura-s-l) (magmacultura.com)
MagmaCultura brings together experienced professionals to offer cultural management solutions that optimize resources for tourism, education, and heritage preservation | Museums, Historical Sites, and Zoos | ๐ช๐ธ Barcelona | 1,500 | 1992 |
| 6 | [OTRA COSA](https://www.tamtam.ai/c/otra-cosa) (gp-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 | Legal Services | ๐ช๐ธ Barcelona | 1,415 | 1996 |
| 7 | [Capitole](https://www.tamtam.ai/c/capitole) (capitole-consulting.com)
IT consulting company specializing in software development, testing, digital transformation, offering diverse projects, training, team building, and flexible benefits. | IT Services and IT Consulting | ๐ช๐ธ Barcelona | 1,248 | 2015 |
| 8 | [Grupo Constant](https://www.tamtam.ai/c/grupo-constant) (grupoconstant.com)
Leader in HR outsourcing, facilities, and temporary work solutions Specializing in effective, innovative services, focusing on quality, authenticity, respect, and efficiency | Human Resources Services | ๐ช๐ธ Barcelona | 1,041 | 1987 |
| 9 | [SDG Group Espaรฑa](https://www.tamtam.ai/c/sdg-group-espana) (sdggroup.com)
Global consulting firm specializing in Data & Analytics, transforming organizations into successful data-driven enterprises through innovative analytics expertise and solutions | Business Consulting and Services | ๐ช๐ธ Barcelona | 974 | 1992 |
| 10 | [ASPY Prevenciรณn](https://www.tamtam.ai/c/aspy-prevencion) (aspyprevencion.com)
Specializing in occupational health and safety, the company offers tailored solutions to ensure compliance and promote excellence in prevention | Business Consulting and Services | ๐ช๐ธ Barcelona | 885 | |
| 11 | [SYNERGIE ESPAรA](https://www.tamtam.ai/c/synergie-espana) (synergie.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 | Staffing and Recruiting | ๐ช๐ธ Barcelona | 813 | 1996 |
| 12 | [Between Technology](https://www.tamtam.ai/c/between-technology) (between.tech)
Connecting skilled professionals with innovative engineering and IT projects worldwide, providing consulting services and fostering career development opportunities. | IT Services and IT Consulting | ๐ช๐ธ Barcelona | 759 | 2000 |
| 13 | [Multiplica](https://www.tamtam.ai/c/multiplica) (multiplica.com)
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 | ๐ช๐ธ Barcelona | 736 | 2000 |
| 14 | [Ingenieros Emetres (Im3)](https://www.tamtam.ai/c/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 | Business Consulting and Services | ๐ช๐ธ Barcelona | 672 | 1981 |
| 15 | [Forvis Mazars in Spain](https://www.tamtam.ai/c/forvis-mazars-in-spain) (forvismazars.com)
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 | ๐ช๐ธ Barcelona | 640 | |
| 16 | [Roman](https://www.tamtam.ai/c/roman) (romanrm.com)
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 | ๐ช๐ธ Barcelona | 623 | 1989 |
| 17 | [TYLin in Europe + LATAM](https://www.tamtam.ai/c/tylin-in-europe-latam) (tylin.com)
Designs infrastructure solutions globally, connecting communities, enhancing designs, providing resilient systems, and offering sustainable solutions to client challenges. | Civil Engineering | ๐ช๐ธ Barcelona | 582 | 1954 |
| 18 | [Human Resources by Sede21](https://www.tamtam.ai/c/human-resources-by-sede21) (sede21.com)
A global company based in Barcelona, emphasizing results, service, and sensibility in delivering its products or services worldwide | Human Resources Services | ๐ช๐ธ Barcelona | 577 | 2005 |
| 19 | [RSM Spain](https://www.tamtam.ai/c/rsm-spain) (rsm.es)
Leading audit, tax, and legal advisory and consulting firm. Serves local and multinational companies, focusing on client understanding and challenges. | Professional Services | ๐ช๐ธ Barcelona | 574 | 1975 |
| 20 | [Diagonal Gest, SL](https://www.tamtam.ai/c/diagonal-gest-sl) (diagonalcompany.com)
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 | ๐ช๐ธ Barcelona | 571 | |
| 21 | [SOCOTEC Spain](https://www.tamtam.ai/c/socotec-spain) (socotec.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 | Engineering Services | ๐ช๐ธ Barcelona | 481 | 2013 |
| 22 | [Nae](https://www.tamtam.ai/c/nae) (nae.global)
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 | ๐ช๐ธ Barcelona | 458 | 2004 |
| 23 | [Iplan Gestiรณn Integral](https://www.tamtam.ai/c/iplan-gestion-integral) (iplangroup-eng.com)
A company offering engineering services in energy, civil works, renewable energies, and environment, with a focus on integral project execution | Engineering Services | ๐ช๐ธ Barcelona | 443 | 2008 |
| 24 | [Broadcaster](https://www.tamtam.ai/c/broadcaster) (vpn.broadcaster.media)
A content agency specializing in integrated communication, storytelling, audiovisual production, and journalism to help companies convey authentic, impactful messages | Media Production | ๐ช๐ธ Barcelona | 438 | 1991 |
| 25 | [Amphos 21](https://www.tamtam.ai/c/amphos-21) (amphos21.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 | Environmental Services | ๐ช๐ธ Barcelona | 428 | 1994 |
| 26 | [Crowe Spain](https://www.tamtam.ai/c/crowe-spain) (crowe.es)
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 | ๐ช๐ธ Barcelona | 405 | 1920 |
| 27 | [Cero](https://www.tamtam.ai/c/cero) (wearecero.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 | Engineering Services | ๐ช๐ธ Barcelona | 396 | 2010 |
| 28 | [Winche Redes Comerciales](https://www.tamtam.ai/c/winche-redes-comerciales) (winche.com)
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 | ๐ช๐ธ Barcelona | 391 | 2002 |
| 29 | [AESA](https://www.tamtam.ai/c/aesa) (aesa.net)
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 | ๐ช๐ธ Barcelona | 387 | 1981 |
| 30 | [JG Ingenieros S.A.](https://www.tamtam.ai/c/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 | Construction | ๐ช๐ธ Barcelona | 384 | 1970 |
## 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.
## More company lists in Barcelona
- [The largest companies in Barcelona](https://www.tamtam.ai/l/largest-companies-barcelona) (1,548)
- [Multinational companies in Barcelona](https://www.tamtam.ai/l/multinational-companies-barcelona) (363)
- [Retail chains in Barcelona](https://www.tamtam.ai/l/retail-chains-barcelona) (174)
- [SaaS companies in Barcelona](https://www.tamtam.ai/l/saas-companies-barcelona) (139)
- [Software Development companies in Barcelona](https://www.tamtam.ai/l/software-development-companies-barcelona) (130)
- [Wellness and Fitness Services companies in Barcelona](https://www.tamtam.ai/l/wellness-and-fitness-services-companies-barcelona) (127)
- [Companies with in-house R&D in Barcelona](https://www.tamtam.ai/l/r-and-d-companies-barcelona) (122)
- [Companies with a mobile app in Barcelona](https://www.tamtam.ai/l/companies-with-mobile-app-barcelona) (107)
- [Healthcare providers in Barcelona](https://www.tamtam.ai/l/healthcare-providers-barcelona) (100)
- [Hotel and hospitality groups in Barcelona](https://www.tamtam.ai/l/hospitality-groups-barcelona) (87)
- [Retail Apparel and Fashion companies in Barcelona](https://www.tamtam.ai/l/retail-apparel-and-fashion-companies-barcelona) (79)
- [Manufacturers in Barcelona](https://www.tamtam.ai/l/manufacturers-barcelona) (79)
- [Education providers in Barcelona](https://www.tamtam.ai/l/education-companies-barcelona) (76)
- [Hospitality companies in Barcelona](https://www.tamtam.ai/l/hospitality-companies-barcelona) (76)
- [E-commerce companies in Barcelona](https://www.tamtam.ai/l/ecommerce-companies-barcelona) (70)
- [Critical infrastructure operators in Barcelona](https://www.tamtam.ai/l/critical-infrastructure-operators-barcelona) (65)
- [Financial services firms in Barcelona](https://www.tamtam.ai/l/financial-services-firms-barcelona) (64)
- [IT Services and IT Consulting companies in Barcelona](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-barcelona) (63)
- [Consulting firms in Barcelona](https://www.tamtam.ai/l/consulting-firms-barcelona) (62)
- [Entertainment Providers companies in Barcelona](https://www.tamtam.ai/l/entertainment-providers-companies-barcelona) (55)
- [IT services companies in Barcelona](https://www.tamtam.ai/l/it-services-companies-barcelona) (55)
- [Subscription businesses in Barcelona](https://www.tamtam.ai/l/subscription-businesses-barcelona) (55)
- [Financial Services companies in Barcelona](https://www.tamtam.ai/l/financial-services-companies-barcelona) (50)
- [Transportation, Logistics, Supply Chain and Storage companies in Barcelona](https://www.tamtam.ai/l/transportation-logistics-supply-chain-and-storage-companies-barcelona) (48)
## 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 Catalonia](https://www.tamtam.ai/l/professional-services-firms-catalonia) (108)
- [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)
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Source: https://www.tamtam.ai/l/professional-services-firms-barcelona