Company lists · Data refreshed September 2026
Top 25 Professional outsourcing services based in Spain
RevenueBase identified 717 professional outsourcing services headquartered in Spain as of September 2026 and tracks 15,300 professional contacts across them, including 808 with verified work emails. Madrid is the largest hub.
This list covers professional outsourcing services headquartered in Spain, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 21, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest professional outsourcing services based in Spain
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 3,716 contacts → | ||||
Indirect evidence “is a tech company specialized in providing, and for.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 2 | 1,447 contacts → | ||||
Indirect evidence “Grupo Marktel es un grupo empresarial que ofrece soluciones globales a sus clientes en el ámbito de la externalziación de servicios con el máximo nivel de especialización en las…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 3 | 1,007 contacts → | ||||
Partial evidence “Specialized services in order to provide to other companies outsourcing for activities, improving its performance and cost.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 4 | 850 contacts → | ||||
Indirect evidence “Nos especializamos en la externalización de servicios a entidades financieras y nos reinventamos continuamente en un mercado cada vez más competitivo para lograr lo más…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 5 | 805 contacts → | ||||
Partial evidence “Grupo Constant es una organización líder en soluciones de outsourcing, facilities y ETT, con más de 30 años de experiencia en el área de Recursos Humanos.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 6 | 460 contacts → | ||||
Partial evidence “Staff Global Group is a group specialised in comprehensive staff outsourcing services.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 7 | 418 contacts → | ||||
Indirect evidence “Tessi IBERIA nace en 1.997 y aunque en el inicio se centra en la gestión hipotecaria, ya desde sus orígenes nace con unos valores fundamentales, que todavía hoy perviven, y…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 8 | 305 contacts → | ||||
Partial evidence “The SELLBYTEL Group is one of the worldwide leading outsourcing specialists and part of Webhelp.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 9 | 233 contacts → | ||||
Indirect evidence “TAX Economistas y Abogados es un grupo con 50 asesorías de empresa, con más de 35 años de experiencia en el sector y 300 profesionales.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 10 | 192 contacts → | ||||
Partial evidence “Bukit BPO es una compañía internacional dedicada al negocio del Business Process Outsourcing y que actúa como partner tecnológico y operacional para clientes de todo el mundo.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 11 | 169 contacts → | ||||
Indirect evidence “Grupo Arelance es una consultora tecnológica especializada en el desarrollo y puesta en marcha de soluciones integrales y Soporte a Proyectos en el ámbito de las Tecnologías de la…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 12 | 143 contacts → | ||||
Indirect evidence “Dabo Consulting es un grupo empresarial que nace con el objetivo de ofrecer servicios profesionales para asesorías; de esta forma, nos podríamos convertir en su único proveedor de…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 13 | 116 contacts → | ||||
Partial evidence “Servicios Reunidos, nace en 1994 con la misión de ayudar a los clientes en la implantación de sus estrategias de negocio mediante el outsourcing.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 14 | 111 contacts → | ||||
Partial evidence “Empresa dedicada al outsourcing de servicios de alta calidad.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 15 | 56 contacts → | ||||
Indirect evidence “Somos una firma multidisciplinar, con más de 35 años de experiencia, especializados en la gestión y externalización de procesos de negocio financieros, recursos humanos, gestión…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 16 | 54 contacts → | ||||
Partial evidence “Rosclar is a professional consultancy formed by lawyers and economists, with expertise in the management of payroll, accounting, tax and trade law.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 17 | 53 contacts → | ||||
Partial evidence “Ribas Àlvarez Assessors i Consultors posa al vostre servei l'equip de professionals en diferents àmbits de l'administració, gestió i consultoria de l'empresa, fundacions…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 18 | 49 contacts → | ||||
Partial evidence “Since 1998, Acero Estudio offers to the market multiple professional services related mainly to the construction sector.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 19 | 48 contacts → | ||||
Indirect evidence “Sincro es una consultora especializada en compliance laboral & dirección estratégica de personas y en asesoramiento fiscal y contable que presta servicios estratégicos tanto a…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 20 | 48 contacts → | ||||
Indirect evidence “ElAyudante offers Executive Assistance and Consulting services with different profiles.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 21 | 44 contacts → | ||||
Indirect evidence “Arnal somos un grupo de empresas dedicadas al sector de los Servicios Profesionales que trabaja por todo el territorio nacional mediante una amplia red de oficinas y delegaciones…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 22 | 42 contacts → | ||||
Indirect evidence “Nos dedicamos a la externalización de procesos de negocio y estamos especializados en los relacionados con la atención y gestión del cliente.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 23 | 40 contacts → | ||||
Indirect evidence “CONSTRUIMOS CLIENTES Proporcionamos soluciones de externalización a medida para empresas que necesitan agilidad, flexibilidad y resultados.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 24 | 39 contacts → | ||||
Indirect evidence “Proporcionamos soluciones a la creciente necesidad de empresas que buscan mejorar sus relaciones con sus clientes a través de un servicio avanzado, profesionalizado y multicanal…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 25 | 38 contacts → | ||||
Indirect evidence “Fundada en 1990.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
RevenueBase Smart Search
RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: professional outsourcing services. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.
- Strong evidence
- The company's own public description of its business names professional outsourcing services.
- Partial evidence
- Its own public description names part of professional outsourcing services, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name professional outsourcing services. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.
RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.
Showing 25 of 717 professional outsourcing services based in Spain
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Professional outsourcing services based in Spain at a glance
As of Sep 21, 2026Companies by employee count
Email recency for this list is measured worldwide rather than for Spain, so it is reported there. Company counts and contact totals on this page are exact for Spain, over 717 companies.
How this list was built
Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among professional outsourcing services, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
- What qualifies
- Companies headquartered in Spain whose own description of what they do matches “professional outsourcing services”. Matching reads each company's description, not its industry code or its name.
- RevenueBase Smart Search
- RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names professional outsourcing services), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
- What we exclude
- Companies whose own description does not clearly place them among professional outsourcing services, and records with no verified work email. Companies headquartered outside Spain are excluded even when they keep an office there.
- Match quality
- In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every listed company carries at least one verified work email, 808 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 21, 2026. Lists refresh periodically as the graph is re-checked.
- Corrections
- Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.
Professional outsourcing services by metro
- Professional outsourcing services in Madrid162
- Professional outsourcing services in Barcelona93
Frequently asked
What is RevenueBase Smart Search?
RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names professional outsourcing services, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.
How many professional outsourcing services are there based in Spain?
RevenueBase identified 717 professional outsourcing services headquartered in Spain as of September 2026, matched on each company's own description of what it does rather than its industry code.
What is the largest company on this list?
GSS Global Sales Solutions, headquartered in Madrid, tops this list with the largest team on record.
Which city has the most professional outsourcing services?
Madrid leads with 162 headquartered companies, followed by Barcelona (93) and Valencia (20).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 808 verified decision-maker contacts tracked across these 717 companies.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 21, 2026.
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About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.
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