# List of professional services firms in Spain

Tamtam tracks 522 professional services firms headquartered in Spain. This list ranks the 100 largest by number of employees on LinkedIn, led by Freelance, Autónomo and Minsait. Their median headcount is 1,701. Half of them were founded in 1992 or later. The most common headquarters are Madrid (47), Barcelona (10) and Seville (5).

These Spanish professional services firms are predominantly large organizations, many with a global presence, specializing in IT, business consulting, and engineering. Freelance offers expert consultancy for technological product development, while Minsait is a global IT consultant. Applus+ provides testing, inspection, and certification services, and Tecnicas Reunidas specializes in engineering and construction of industrial facilities.

A significant number of these firms, including NTT DATA Europe & Latam, Applus+, Tecnicas Reunidas, Grupo Tragsa, and Accenture España, are headquartered in Madrid, indicating a concentration of large professional services operations in the capital city.

🇪🇸 Spain · 100 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Freelance](https://www.tamtam.ai/c/freelance) (ondira.com)<br>Specializing in guiding the development, funding, and market launch of technological products through expert consultancy services | Business Consulting and Services | 🇪🇸 Seville | 108,120 | 2017 |
| 2 | [Autónomo](https://www.tamtam.ai/c/autonomo-badalona) (x)<br>Specializing in LOPD compliance, auditing, AGPDE registration, drafting security documents, and customizing clauses in contracts for companies | Legal Services | 🇪🇸 Badalona | 66,296 |  |
| 3 | [Minsait](https://www.tamtam.ai/c/minsait) (minsait.com)<br>A leading Spanish technological consultant operating globally, leveraging cloud, security, payments, and innovative technology to drive business and societal impact #MoreMinsait | IT Services and IT Consulting | 🇪🇸 Alcobendas | 45,000 | 2016 |
| 4 | [NTT DATA Europe & Latam](https://www.tamtam.ai/c/ntt-data-europe-and-latam) (nttdata.com)<br>Global IT services provider transforming clients through consulting, solutions, and managed services to enable a confident move into the digital future | IT Services and IT Consulting | 🇪🇸 Madrid | 31,932 |  |
| 5 | [Applus+](https://www.tamtam.ai/c/applus) (applus.com)<br>A global leader in testing, inspection, and certification services, providing innovative solutions for asset integrity, regulatory compliance, and environmental performance | Business Consulting and Services | 🇪🇸 Madrid | 20,046 |  |
| 6 | [Tecnicas Reunidas](https://www.tamtam.ai/c/tecnicas-reunidas) (tecnicasreunidas.es)<br>An international general contractor specializing in engineering and construction of industrial facilities in oil & gas, refining, power generation, infrastructures, and energy transition | Engineering Services | 🇪🇸 Madrid | 12,368 | 1960 |
| 7 | [Grupo Tragsa](https://www.tamtam.ai/c/grupo-tragsa) (tragsa.es)<br>Provides engineering, technical assistance, and execution of projects for public administrations in agriculture, environment, and rural development sectors. | Environmental Services | 🇪🇸 Madrid | 12,239 | 1977 |
| 8 | [Law firm](https://www.tamtam.ai/c/law-firm) (xx)<br>Specializes in aviation-related contracts focusing on civil aircraft engine maintenance and worldwide engine leasing services for clients. | Law Practice | 🇪🇸 | 12,081 |  |
| 9 | [Ayesa](https://www.tamtam.ai/c/ayesa) (ayesa.com)<br>Global provider of technology and engineering services with expertise in digital solutions, infrastructure design, and supervision for private and public sectors worldwide | Business Consulting and Services | 🇪🇸 Seville | 11,405 | 1966 |
| 10 | [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 |  |
| 11 | [ILUNION](https://www.tamtam.ai/c/ilunion) (ilunion.com)<br>A group of companies focused on creating a more accessible world, reinventing themselves daily to compete and move forward | Business Consulting and Services | 🇪🇸 Madrid | 8,198 | 2014 |
| 12 | [Externa](https://www.tamtam.ai/c/externa-a-coruna) (grupoexterna.es)<br>A provider of comprehensive outsourcing services, specializing in efficient resource management and tailored solutions to enhance productivity and cost savings for clients | Human Resources Services | 🇪🇸 A Coruña | 7,000 | 2006 |
| 13 | [Tragsatec](https://www.tamtam.ai/c/tragsatec) (tragsa.es)<br>Tragsatec offers engineering and technical assistance in various fields including environmental, agricultural, fisheries, infrastructures, and information technologies, focusing on innovation and quality services | Environmental Services | 🇪🇸 | 6,560 | 1989 |
| 14 | [Accenture España](https://www.tamtam.ai/c/accenture-espana) (accenture.com)<br>A global professional services company helping businesses and governments with digital transformation, cloud technology, data analytics, and industry expertise to drive tangible outcomes | Business Consulting and Services | 🇪🇸 Madrid | 6,208 |  |
| 15 | [INECO](https://www.tamtam.ai/c/ineco) (ineco.com)<br>A leading engineering and consulting firm in sustainable mobility and digital transformation, with a global presence and a focus on innovation | Civil Engineering | 🇪🇸 Madrid | 5,743 | 1968 |
| 16 | [despacho de abogados](https://www.tamtam.ai/c/despacho-de-abogados-salamanca) (titular)<br>Specializing in criminal, family, and civil law services | Legal Services | 🇪🇸 Salamanca | 5,728 |  |
| 17 | [KPMG España](https://www.tamtam.ai/c/kpmg-espana) (kpmg.com)<br>Professional services firm providing audit, tax, legal, financial, and business advisory with global expertise and local market knowledge. | Professional Services | 🇪🇸 Madrid | 5,523 |  |
| 18 | [IDOM Consulting, Engineering, Architecture](https://www.tamtam.ai/c/idom-consulting-engineering-architecture) (idom.com)<br>A multinational consulting, engineering, and architecture firm offering personalized client services, delivering independent, impartial global projects with a diverse, engaged workforce | Engineering Services | 🇪🇸 Bilbao | 5,424 | 1957 |
| 19 | [Sener](https://www.tamtam.ai/c/sener) (group.sener)<br>Responds to demanding challenges with innovative, efficient solutions, advancing society across aerospace, defense, energy, mobility, data centers, and digital sectors for 70 years. | Engineering Services | 🇪🇸 Getxo | 4,878 | 1956 |
| 20 | [Management Solutions](https://www.tamtam.ai/c/management-solutions) (managementsolutions.com)<br>Providing consulting services in strategy, organization, risk management, and technology for financial, energy, and telecommunications sectors worldwide. | Business Consulting and Services | 🇪🇸 Madrid | 4,798 | 2002 |
| 21 | [Quirónprevención](https://www.tamtam.ai/c/quironprevencion) (quironprevencion.com)<br>Providing occupational risk prevention services, promoting workplace safety, and caring for employee health across multiple countries and industries. | Business Consulting and Services | 🇪🇸 Madrid | 4,503 | 2017 |
| 22 | [VASS](https://www.tamtam.ai/c/vass) (vasscompany.com)<br>Global technology company specializing in intelligent digital transformation, integrating technology, data, and AI to help organizations achieve sustainable competitive advantages across various sectors. | IT Services and IT Consulting | 🇪🇸 Alcobendas | 4,482 |  |
| 23 | [Babel](https://www.tamtam.ai/c/babel) (babelgroup.com)<br>International team providing specialized technology solutions and consulting to help major clients overcome digital business challenges effectively. | IT Services and IT Consulting | 🇪🇸 Las Rozas de Madrid | 4,333 | 2003 |
| 24 | [Randstad España](https://www.tamtam.ai/c/randstad-espana) (randstad.es)<br>Leading provider of human resources solutions in Spain, offering recruitment, training, temporary staffing, and workforce consulting services. | Human Resources Services | 🇪🇸 Madrid | 4,014 |  |
| 25 | [Marktel Global Services SA](https://www.tamtam.ai/c/marktel-global-services-sa) (marktel.es)<br>A group specializing in BPO, Contact Center, and Technology Outsourcing services, providing global solutions with high levels of specialization | Professional Services | 🇪🇸 Madrid | 4,000 | 2000 |
| 26 | [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 |
| 27 | [PwC España](https://www.tamtam.ai/c/pwc-espana) (pwc.es)<br>Provides audit, tax, legal, consulting, and transaction services across Spain, helping businesses navigate change and build trust. | Business Consulting and Services | 🇪🇸 Madrid | 3,761 | 1929 |
| 28 | [Oesia](https://www.tamtam.ai/c/oesia) (grupooesia.com)<br>Oesía is a multinational technology consultancy firm with divisions in ICT and security/defense, specializing in projects for clients worldwide Their innovative solutions and services drive value and growth | IT Services and IT Consulting | 🇪🇸 Rivas | 3,697 | 1976 |
| 29 | [hiberus](https://www.tamtam.ai/c/hiberus) (hiberus.com)<br>This company provides technology consulting and digital transformation services, offering specialized solutions across various sectors with a large professional team globally. | IT Services and IT Consulting | 🇪🇸 Zaragoza | 3,616 | 2011 |
| 30 | [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 |
| 31 | [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 |
| 32 | [Plexus Tech](https://www.tamtam.ai/c/plexus-tech) (plexus.es)<br>A technology company specializing in various sectors, offering 360º services with a focus on innovation to enhance people's lives | IT Services and IT Consulting | 🇪🇸 Santiago de Compostela | 3,154 | 2000 |
| 33 | [Garrigues](https://www.tamtam.ai/c/garrigues) (garrigues.com)<br>An international team of legal and tax experts providing top-quality services with commitment to ethics and innovation, helping businesses in various countries | Legal Services | 🇪🇸 Madrid | 2,990 | 1941 |
| 34 | [VITALY](https://www.tamtam.ai/c/vitaly) (vitaly.es)<br>A company formed by the merger of Cualtis and Grupo Preving, specializing in occupational health and risk prevention services tailored to each company's needs | Business Consulting and Services | 🇪🇸 Badajoz | 2,923 | 1988 |
| 35 | [TYPSA](https://www.tamtam.ai/c/typsa) (typsa.com)<br>A group of consulting engineering firms specializing in civil engineering, architecture, building technology, energy, and environmental projects worldwide since 1966 | Engineering Services | 🇪🇸 San Sebastián de los Reyes | 2,755 | 1966 |
| 36 | [Servinform](https://www.tamtam.ai/c/servinform) (servinform.es)<br>Providing customized technology solutions including RPA and AI to optimize resources, reduce time, and increase benefits across multiple industries. | IT Services and IT Consulting | 🇪🇸 Madrid | 2,718 | 1977 |
| 37 | [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 |
| 38 | [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 |
| 39 | [Avanta Prevención](https://www.tamtam.ai/c/avanta-prevencion) (avantaprevencion.com)<br>Valora Prevención de Avanta Salud offers a prevention service for businesses, focusing on improving worker health, reducing risks, and ensuring legal compliance | Business Consulting and Services | 🇪🇸 Quart de Poblet | 2,500 |  |
| 40 | [knowmad mood](https://www.tamtam.ai/c/knowmad-mood) (knowmadmood.com)<br>A leading digital transformation company focused on innovation, sustainability, and talent development Committed to adding value, creativity, and technology expertise | IT Services and IT Consulting | 🇪🇸 Las Rozas | 2,306 | 1994 |
| 41 | [Estudio de Arquitectura](https://www.tamtam.ai/c/estudio-de-arquitectura) (gabaldonarquitecto.es)<br>A Sevilla-based company since 1994, specializing in residential, commercial, and industrial building projects with a focus on customized architecture and energy efficiency | Architecture and Planning | 🇪🇸 Seville | 2,258 | 1994 |
| 42 | [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 |
| 43 | [Ibermática](https://www.tamtam.ai/c/ibermatica) (ayesa.com)<br>A leading Spanish IT services company offering consulting, infrastructure services, system integration, outsourcing, and ERP solutions across multiple industries | IT Services and IT Consulting | 🇪🇸 Donostia-San Sebastian | 2,144 | 1973 |
| 44 | [Applus+ Europe](https://www.tamtam.ai/c/applus-europe) (applus.com)<br>A global leader in testing, inspection, and certification services, offering innovative solutions for asset management, compliance inspections, and technical support | Business Consulting and Services | 🇪🇸 Madrid | 1,963 | 1981 |
| 45 | [COMINTON, Marketing internacional y comercio exterior.](https://www.tamtam.ai/c/cominton-marketing-internacional-y-comercio-exterior) (cominton.es)<br>International consultancy specializing in foreign trade, online marketing, social media, and networking Official ICEX consultant providing training in international marketing and communication | International Trade and Development | 🇪🇸 Zaragoza | 1,863 | 2004 |
| 46 | [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 |  |
| 47 | [Entelgy](https://www.tamtam.ai/c/entelgy) (entelgy.com)<br>A global consultancy that accelerates business transformation through innovative technological solutions, helping clients adapt and thrive in a constantly changing world | IT Services and IT Consulting | 🇪🇸 Madrid | 1,796 |  |
| 48 | [STRATESYS](https://www.tamtam.ai/c/stratesys) (stratesys-ts.com)<br>Multinational company specializing in leading technology platforms, development of new applications, and digital solutions across various industries in Europe and America | IT Services and IT Consulting | 🇪🇸 Madrid (Headquarters) | 1,740 | 1997 |
| 49 | [ISDEFE](https://www.tamtam.ai/c/isdefe) (isdefe.es)<br>Provides innovative, reliable, sustainable solutions to government challenges, offering consulting, engineering services, and managing aerospace complexes for defense and administration. | Engineering Services | 🇪🇸 Madrid | 1,732 | 1985 |
| 50 | [NWorld Advisory, Tech & Operations](https://www.tamtam.ai/c/nworld-advisory-tech-and-operations) (n.world)<br>A group of specialized companies offering services in various stages of the value chain: Nfq, Nter, and Nforce | Business Consulting and Services | 🇪🇸 Madrid | 1,701 |  |
| 51 | [Safeguard Global Staff Leasing Spain](https://www.tamtam.ai/c/safeguard-global-staff-leasing-spain) (safeguardglobal.com)<br>A global company providing Direct Hire and Temporary Staffing services in over 170 countries with a dedicated team of over 2000 professionals | Staffing and Recruiting | 🇪🇸 Madrid | 1,700 | 2008 |
| 52 | [LLYC](https://www.tamtam.ai/c/llyc) (llyc.global)<br>A creative partner specializing in marketing and corporate affairs to enhance and protect businesses through boldness, innovation, and influence | Public Relations and Communications Services | 🇪🇸 Madrid | 1,649 | 1995 |
| 53 | [Applus+ Oil and Gas](https://www.tamtam.ai/c/applus-oil-and-gas) (applus.com)<br>A global leader in testing, inspection, and certification services, focusing on enhancing quality, safety, and environmental performance across various industries | Business Consulting and Services | 🇪🇸 Madrid | 1,583 | 1937 |
| 54 | [IZERTIS](https://www.tamtam.ai/c/izertis) (izertis.com)<br>Provider of information and communication technology solutions, assisting clients in achieving business goals through long-term partnerships for technological platform development | IT Services and IT Consulting | 🇪🇸 Gijón | 1,511 | 1996 |
| 55 | [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 |
| 56 | [GRUPO V3](https://www.tamtam.ai/c/grupo-v3) (v3data.com.br)<br>V3 Capital specializes in Transformational Management, improving business execution through impactful actions and the V3 Capital Platform, transforming individuals and optimizing potential | Professional Services | 🇪🇸 Vitória | 1,500 | 2020 |
| 57 | [SENASA](https://www.tamtam.ai/c/senasa) (senasa.es)<br>Specialized in training and consultancy for air navigation and security, focusing on aviation professionals and technical assistance to civil aviation authorities | Airlines and Aviation | 🇪🇸 Madrid | 1,463 | 1991 |
| 58 | [THE CT ENGINEERING GROUP](https://www.tamtam.ai/c/the-ct-engineering-group) (ctengineeringgroup.com)<br>An international engineering company offering services from design to manufacturing engineering, R&D projects, and after-sales support in various sectors worldwide | IT Services and IT Consulting | 🇪🇸 Getafe | 1,453 | 1988 |
| 59 | [SATEC](https://www.tamtam.ai/c/satec-pozuelo-de-alarcon) (satec.es)<br>A global system integrator specializing in IT consulting, BPO services, industry 40 solutions, and turnkey software projects since 1988 | IT Services and IT Consulting | 🇪🇸 Pozuelo de Alarcón | 1,426 | 1988 |
| 60 | [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 |
| 61 | [Nfq Advisory, Solutions, Outsourcing](https://www.tamtam.ai/c/nfq-advisory-solutions-outsourcing) (nfq.es)<br>Consulting firm specializing in banking, insurance, capital markets with advisory, software solutions, and outsourcing services for financial institutions. | Business Consulting and Services | 🇪🇸 Madrid | 1,393 | 2010 |
| 62 | [Cresa Iberia](https://www.tamtam.ai/c/cresa-iberia) (cresa.com)<br>Real estate consultancy offering comprehensive customer service throughout their transformation process, focusing beyond just the physical space | Real Estate | 🇪🇸 Madrid | 1,373 |  |
| 63 | [Best Relations](https://www.tamtam.ai/c/best-relations) (agencia.best)<br>A PR and social media consulting firm founded in 1998, specializing in strategic thinking for content creation, audience targeting, and marketing goals across various industries | Public Relations and Communications Services | 🇪🇸 Madrid | 1,316 | 1998 |
| 64 | [AENOR](https://www.tamtam.ai/c/aenor) (aenor.com)<br>A global company specializing in Testing, Inspection, and Certification services to help organizations overcome competitiveness gaps and build trust through training and information services | International Trade and Development | 🇪🇸 Madrid | 1,295 | 1986 |
| 65 | [Sngular](https://www.tamtam.ai/c/sngular) (sngular.com)<br>A next-generation technology partner delivering innovative solutions with deep expertise, a global network of innovators, and a focus on sustainability | IT Services and IT Consulting | 🇪🇸 Madrid | 1,285 | 2014 |
| 66 | [TÜV Rheinland Europe](https://www.tamtam.ai/c/tuv-rheinland-europe) (tuv.com)<br>Ensures quality, safety, and efficiency through testing, certifying products, plants, processes, and management systems, alongside qualifying specialists and training individuals for companies globally. | Public Safety | 🇪🇸 Madrid | 1,268 |  |
| 67 | [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 |
| 68 | [Teknei](https://www.tamtam.ai/c/teknei) (teknei.com)<br>A leading technology services and consulting firm specializing in innovative digital solutions, business automation, cybersecurity, and infrastructure modernization, with a focus on fostering innovation and collaboration among its team | IT Services and IT Consulting | 🇪🇸 Bilbao | 1,242 | 2010 |
| 69 | [ManpowerGroup Spain](https://www.tamtam.ai/c/manpowergroup-spain) (manpowergroup.es)<br>Global leader in innovative talent strategy solutions, offering services in recruitment, assessment, training, career development, outsourcing, and consulting to drive business and individual success | Human Resources Services | 🇪🇸 Madrid | 1,224 | 1988 |
| 70 | [Uría Menéndez](https://www.tamtam.ai/c/uria-menendez) (uria.com)<br>International law firm with nearly 600 lawyers across 11 offices, specializing in Iberian and Latin American markets, collaborating globally. | Legal Services | 🇪🇸 Madrid | 1,213 | 1947 |
| 71 | [AUREN](https://www.tamtam.ai/c/auren) (auren.com)<br>Auren is a Spanish firm specializing in advanced audit, advisory, and consulting services to improve company management through innovation, quality, and professional ethics | Business Consulting and Services | 🇪🇸 Madrid | 1,165 |  |
| 72 | [EAG (Empresarios Agrupados - GHESA)](https://www.tamtam.ai/c/eag-empresarios-agrupados-ghesa) (empresariosagrupados.es)<br>A leading European engineering group with expertise in complex projects, operating internationally with a large workforce and significant turnover | Engineering Services | 🇪🇸 Madrid | 1,161 | 1963 |
| 73 | [Eptisa](https://www.tamtam.ai/c/eptisa) (eptisa.com)<br>A multinational company specializing in engineering, consultancy, information technologies, and social development with a focus on sustainable solutions and client satisfaction | Engineering Services | 🇪🇸 Madrid | 1,155 | 1956 |
| 74 | [Empleado Informado](https://www.tamtam.ai/c/empleado-informado) (instagram.com)<br>A blog providing information on labor law, offering quick access on Instagram Consult with their lawyers for private advice on labor issues | Information Services | 🇪🇸 Madrid | 1,136 |  |
| 75 | [JUNGLE](https://www.tamtam.ai/c/jungle-madrid) (wejungle.com)<br>An ecosystem of creative companies specializing in transforming businesses using creativity across strategy, design, advertising, digital production, and more | Business Consulting and Services | 🇪🇸 Madrid | 1,116 | 2019 |
| 76 | [EULEN Flexiplán](https://www.tamtam.ai/c/eulen-flexiplan) (flexiplan.eulen.com)<br>With over 45 years of experience, the company offers recruitment, selection, and placement services for professionals, utilizing innovative HR technologies like E-recluitment and E-contracting | Human Resources Services | 🇪🇸 Madrid | 1,109 |  |
| 77 | [ICP](https://www.tamtam.ai/c/icp-meco) (icp.es)<br>Leading logistics company in Spain offering tailored solutions for various industries, equipped with advanced technology for efficient supply chain management and e-commerce integration | Transportation, Logistics, Supply Chain and Storage | 🇪🇸 Meco | 1,093 | 1997 |
| 78 | [CEMOSA](https://www.tamtam.ai/c/cemosa) (cemosa.es)<br>Specialized engineering and quality control services in construction, promoting knowledge, innovation, and technology for over 45 years Offering services in multiple areas like engineering, geotechnics, and certification | Civil Engineering | 🇪🇸 Málaga | 1,092 | 1972 |
| 79 | [GHENOVA](https://www.tamtam.ai/c/ghenova) (ghenova.com)<br>International engineering company offering multidisciplinary services in naval, defense, energy, digital transformation, and infrastructures with over 30 years of experience and 900 employees worldwide | Design Services | 🇪🇸 Seville | 1,072 | 2006 |
| 80 | [Seprotec Multilingual Solutions](https://www.tamtam.ai/c/seprotec-multilingual-solutions) (seprotec.com)<br>Provides translation, localization, interpretation, and intellectual property management services in 220 languages with global 24/7 support centers. | Translation and Localization | 🇪🇸 Las Rozas | 1,067 | 1989 |
| 81 | [LKS NEXT](https://www.tamtam.ai/c/lks-next) (lksnext.com)<br>The company provides comprehensive business consulting services with a focus on technology, finance, and legal support, working closely with clients for transformative and successful outcomes | IT Services and IT Consulting | 🇪🇸 Mondragon - Arrasate | 1,062 | 1991 |
| 82 | [profesional por cuenta propia \| freelance \| autónomo](https://www.tamtam.ai/c/profesional-por-cuenta-propia-freelance-autonomo) (oscar-web.eu)<br>Specializing in drafting services for architecture, topography, public works, and engineering Over 15 years of experience in project drafting and collaboration with other professionals | Architecture & Planning | 🇪🇸 Alfara del Patriarca | 1,054 |  |
| 83 | [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 |
| 84 | [Bluetab, an IBM Company](https://www.tamtam.ai/c/bluetab-an-ibm-company) (bluetab.net)<br>Support organizations in EMEA and America with data readiness, scalable data preparation, and GenAI implementation for data-driven culture. | IT Services and IT Consulting | 🇪🇸 Madrid | 1,036 | 2006 |
| 85 | [Apave Spain (antes Eurocontrol)](https://www.tamtam.ai/c/apave-spain-antes-eurocontrol) (eurocontrol.apave.com)<br>EUROCONTROL provides a wide range of quality control and engineering services for industrial materials, equipment, and plants, including civil engineering projects | Engineering Services | 🇪🇸 Madrid | 1,030 | 1973 |
| 86 | [BDO Spain](https://www.tamtam.ai/c/bdo-spain) (bdo.es)<br>Global professional services firm providing audit, legal, advisory, and outsourcing tailored to diverse clients across industries and countries. | Business Consulting and Services | 🇪🇸 Madrid | 1,003 |  |
| 87 | [RDT ENGINEERS](https://www.tamtam.ai/c/rdt-engineers) (rdt.com)<br>Development of advanced technological engineering and IT solutions providing clients competitive advantages with agility, flexibility, and sustainable innovation worldwide. | IT Services and IT Consulting | 🇪🇸 Derio | 985 | 2006 |
| 88 | [CHINA](https://www.tamtam.ai/c/china) (llyc.global)<br>It is an advertising agency founded in 2010, focusing on solving client problems rather than just managing accounts for advertisers. | Advertising Services | 🇪🇸 Madrid | 978 | 2010 |
| 89 | [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 |
| 90 | [BBVA Asset Management en España](https://www.tamtam.ai/c/bbva-asset-management-en-espana) (bbvaassetmanagement.com)<br>A global asset management unit specializing in investment funds and pension management, known for innovation, excellence, and regional expertise | Investment Management | 🇪🇸 Madrid | 953 | 1985 |
| 91 | [ECIJA](https://www.tamtam.ai/c/ecija) (ecija.com)<br>A top-ranked law firm in Spain, ECIJA offers full-service legal assistance in Corporate, M&A, Commercial, TMT, labor, litigation, tax, and more across multiple countries | Legal Services | 🇪🇸 Madrid | 928 | 1997 |
| 92 | [PKF Attest](https://www.tamtam.ai/c/pkf-attest) (pkf-attest.es)<br>A leading professional services firm in Spain, part of PKF International Network, with over 600 professionals and 11 offices across the country | Business Consulting and Services | 🇪🇸 Bilbao | 904 | 1990 |
| 93 | [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 |  |
| 94 | [Grant Thornton España](https://www.tamtam.ai/c/grant-thornton-espana) (grantthornton.es)<br>Leading global professional services provider, specializing in Audit, Business Consulting, Technology & Innovation, Tax, Legal, Financial, Labor, and Outsourcing services. | Business Consulting and Services | 🇪🇸 Madrid | 880 | 1984 |
| 95 | [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 |
| 96 | [The Cocktail](https://www.tamtam.ai/c/the-cocktail)<br>The Cocktail is a consultancy specializing in digital transformation projects, offering strategy development, design, technology, data analysis, and international solutions within WPP group | Business Consulting and Services | 🇪🇸 Madrid | 864 |  |
| 97 | [Cualtis](https://www.tamtam.ai/c/cualtis) (cualtis.com)<br>A prevention service accredited in four specialties nationwide, offering health, workplace environment, and productivity improvement solutions with various certifications and a digital management platform | Government Administration | 🇪🇸 Madrid | 853 | 2014 |
| 98 | [INERCO](https://www.tamtam.ai/c/inerco) (inerco.com)<br>Provider of comprehensive services and advanced technologies for sustainable industrial development, specializing in emissions reduction, energy efficiency, renewables, and environmental consulting globally | Engineering Services | 🇪🇸 Seville | 852 | 1984 |
| 99 | [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 |  |
| 100 | [Pérez-Llorca](https://www.tamtam.ai/c/perez-llorca) (perezllorca.com)<br>A leading law firm in Spain, providing quality legal advice to national and international clients across various jurisdictions, with offices in major global cities | Legal Services | 🇪🇸 Madrid | 825 | 1983 |

## 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 Spain

- [The largest companies in Spain](https://www.tamtam.ai/l/largest-companies-spain) (10,893)
- [Multinational companies in Spain](https://www.tamtam.ai/l/multinational-companies-spain) (2,706)
- [Retail chains in Spain](https://www.tamtam.ai/l/retail-chains-spain) (1,251)
- [Manufacturers in Spain](https://www.tamtam.ai/l/manufacturers-spain) (1,080)
- [Companies with in-house R&D in Spain](https://www.tamtam.ai/l/r-and-d-companies-spain) (1,067)
- [Wellness and Fitness Services companies in Spain](https://www.tamtam.ai/l/wellness-and-fitness-services-companies-spain) (879)
- [Healthcare providers in Spain](https://www.tamtam.ai/l/healthcare-providers-spain) (711)
- [Companies with a mobile app in Spain](https://www.tamtam.ai/l/companies-with-mobile-app-spain) (561)
- [Hotel and hospitality groups in Spain](https://www.tamtam.ai/l/hospitality-groups-spain) (539)
- [Family-owned companies in Spain](https://www.tamtam.ai/l/family-owned-companies-spain) (531)
- [Software Development companies in Spain](https://www.tamtam.ai/l/software-development-companies-spain) (530)
- [Critical infrastructure operators in Spain](https://www.tamtam.ai/l/critical-infrastructure-operators-spain) (517)
- [IT services companies in Spain](https://www.tamtam.ai/l/it-services-companies-spain) (484)
- [Financial services firms in Spain](https://www.tamtam.ai/l/financial-services-firms-spain) (482)
- [Food and Beverage Services companies in Spain](https://www.tamtam.ai/l/food-and-beverage-services-companies-spain) (462)
- [SaaS companies in Spain](https://www.tamtam.ai/l/saas-companies-spain) (445)
- [Retail Apparel and Fashion companies in Spain](https://www.tamtam.ai/l/retail-apparel-and-fashion-companies-spain) (439)
- [IT Services and IT Consulting companies in Spain](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-spain) (437)
- [Hospitality companies in Spain](https://www.tamtam.ai/l/hospitality-companies-spain) (435)
- [Consulting firms in Spain](https://www.tamtam.ai/l/consulting-firms-spain) (420)
- [E-commerce companies in Spain](https://www.tamtam.ai/l/ecommerce-companies-spain) (416)
- [Food and beverage companies in Spain](https://www.tamtam.ai/l/food-and-beverage-companies-spain) (416)
- [Hardware manufacturers in Spain](https://www.tamtam.ai/l/hardware-companies-spain) (415)
- [Transportation, Logistics, Supply Chain and Storage companies in Spain](https://www.tamtam.ai/l/transportation-logistics-supply-chain-and-storage-companies-spain) (397)

## The same list elsewhere in Spain

- [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)
- [Professional services firms in Barcelona](https://www.tamtam.ai/l/professional-services-firms-barcelona) (81)

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