The largest professional services firms in Madrid include global IT, consulting, and engineering companies. NTT DATA Europe & Latam offers IT services, Applus+ specializes in testing and inspection, and Tecnicas Reunidas is an international contractor for industrial facilities. Other notable firms are Grupo Tragsa, providing environmental services, and ILUNION, focused on accessibility solutions.
A common thread among these companies is their headquarters in Madrid, indicating a concentration of professional services within the city. Many of these firms, such as KPMG España and PwC España, offer a broad spectrum of advisory services, from audit and tax to business consulting, serving a diverse clientele across various sectors.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
NTT DATA Europe & Latamnttdata.com
Global IT services provider transforming clients through consulting, solutions, and managed services to enable a confident move into the digital future |
31,932 | |||
| 2 |
Applus+applus.com
A global leader in testing, inspection, and certification services, providing innovative solutions for asset integrity, regulatory compliance, and environmental performance |
20,046 | |||
| 3 |
Tecnicas Reunidastecnicasreunidas.es
An international general contractor specializing in engineering and construction of industrial facilities in oil & gas, refining, power generation, infrastructures, and energy transition |
12,368 | |||
| 4 |
Grupo Tragsatragsa.es
Provides engineering, technical assistance, and execution of projects for public administrations in agriculture, environment, and rural development sectors. |
12,239 | |||
| 5 |
ILUNIONilunion.com
A group of companies focused on creating a more accessible world, reinventing themselves daily to compete and move forward |
8,198 | |||
| 6 |
Accenture Españaaccenture.com
A global professional services company helping businesses and governments with digital transformation, cloud technology, data analytics, and industry expertise to drive tangible outcomes |
6,208 | |||
| 7 | 5,743 | ||||
| 8 |
KPMG Españakpmg.com
Professional services firm providing audit, tax, legal, financial, and business advisory with global expertise and local market knowledge. |
5,523 | |||
| 9 |
Management Solutionsmanagementsolutions.com
Providing consulting services in strategy, organization, risk management, and technology for financial, energy, and telecommunications sectors worldwide. |
4,798 | |||
| 10 |
Quirónprevenciónquironprevencion.com
Providing occupational risk prevention services, promoting workplace safety, and caring for employee health across multiple countries and industries. |
4,503 | |||
| 11 |
Randstad Españarandstad.es
Leading provider of human resources solutions in Spain, offering recruitment, training, temporary staffing, and workforce consulting services. |
4,014 | |||
| 12 |
Marktel Global Services SAmarktel.es
A group specializing in BPO, Contact Center, and Technology Outsourcing services, providing global solutions with high levels of specialization |
4,000 | |||
| 13 |
PwC Españapwc.es
Provides audit, tax, legal, consulting, and transaction services across Spain, helping businesses navigate change and build trust. |
3,761 | |||
| 14 |
Garriguesgarrigues.com
An international team of legal and tax experts providing top-quality services with commitment to ethics and innovation, helping businesses in various countries |
2,990 | |||
| 15 |
Servinformservinform.es
Providing customized technology solutions including RPA and AI to optimize resources, reduce time, and increase benefits across multiple industries. |
2,718 | |||
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. | |||||
| 16 |
Applus+ Europeapplus.com
A global leader in testing, inspection, and certification services, offering innovative solutions for asset management, compliance inspections, and technical support |
1,963 | |||
| 17 |
Entelgyentelgy.com
A global consultancy that accelerates business transformation through innovative technological solutions, helping clients adapt and thrive in a constantly changing world |
1,796 | |||
| 18 | 1,732 | ||||
| 19 |
NWorld Advisory, Tech & Operationsn.world
A group of specialized companies offering services in various stages of the value chain: Nfq, Nter, and Nforce |
1,701 | |||
| 20 |
Safeguard Global Staff Leasing Spainsafeguardglobal.com
A global company providing Direct Hire and Temporary Staffing services in over 170 countries with a dedicated team of over 2000 professionals |
1,700 | |||
| 21 |
LLYCllyc.global
A creative partner specializing in marketing and corporate affairs to enhance and protect businesses through boldness, innovation, and influence |
1,649 | |||
| 22 |
Applus+ Oil and Gasapplus.com
A global leader in testing, inspection, and certification services, focusing on enhancing quality, safety, and environmental performance across various industries |
1,583 | |||
| 23 | 1,463 | ||||
| 24 |
Nfq Advisory, Solutions, Outsourcingnfq.es
Consulting firm specializing in banking, insurance, capital markets with advisory, software solutions, and outsourcing services for financial institutions. |
1,393 | |||
| 25 |
Cresa Iberiacresa.com
Real estate consultancy offering comprehensive customer service throughout their transformation process, focusing beyond just the physical space |
1,373 | |||
| 26 |
Best Relationsagencia.best
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 |
1,316 | |||
| 27 | 1,295 | ||||
| 28 |
Sngularsngular.com
A next-generation technology partner delivering innovative solutions with deep expertise, a global network of innovators, and a focus on sustainability |
1,285 | |||
| 29 |
TÜV Rheinland Europetuv.com
Ensures quality, safety, and efficiency through testing, certifying products, plants, processes, and management systems, alongside qualifying specialists and training individuals for companies globally. |
1,268 | |||
| 30 |
ManpowerGroup Spainmanpowergroup.es
Global leader in innovative talent strategy solutions, offering services in recruitment, assessment, training, career development, outsourcing, and consulting to drive business and individual success |
1,224 | |||
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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 11, 2026.
More company lists in Madrid
- The largest companies in Madrid 2,650
- Multinational companies in Madrid 815
- Retail chains in Madrid 259
- Financial services firms in Madrid 231
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- Critical infrastructure operators in Madrid 169
- Healthcare providers in Madrid 161
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- Consulting firms in Madrid 157
- IT services companies in Madrid 155
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- IT Services and IT Consulting companies in Madrid 138
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- SaaS companies in Madrid 113
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- Corporate groups and holding companies in Madrid 89
- Business Consulting and Services companies in Madrid 80
- Marketing and communications agencies in Madrid 79