Company lists · Data refreshed September 2026

Top 25 SEO services companies based in Spain

Name: SEO services companies based in Spain
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 790 companies tracked

RevenueBase identified 790 SEO services companies headquartered in Spain as of September 2026 and tracks 2,979 professional contacts across them, including 414 with verified work emails. Madrid is the largest hub.

This list covers SEO services companies 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 19, 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.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 19, 2026 86% judged on-target in blind review

790Companies

2,979Contacts tracked

414Verified emails

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The 25 largest SEO services companies based in Spain

Ranked by team size

Top 25 of 790 SEO services companies based in Spain, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to SEO services companies: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Bigseo	Strong evidence	Barcelona, SpainHQ checked Sep 19, 2026	51-200	108 contacts →
	Strong evidence “En nuestra agencia SEO en Barcelona somos unos apasionados del posicionamiento web.” Source: RevenueBase Database · checked Sep 19, 2026
2	Royal Comunicación	Indirect evidence	Madrid, SpainHQ checked Sep 19, 2026	51-200	85 contacts →
	Indirect evidence “Royal Comunicación es una empresa dedicada al Marketing online teniendo como fin principal optimizar y rentabilizar los recursos de las empresas en la red.” Source: RevenueBase Database · checked Sep 19, 2026
3	agenciaseo.eu	Indirect evidence	Valencia, SpainHQ checked Sep 19, 2026	11-50	38 contacts →
	Indirect evidence “Esta empresa se creó para dar respuesta a una necesidad cada vez más demandada: el posicionamiento web.” Source: RevenueBase Database · checked Sep 19, 2026
4	Keyweo	Indirect evidence	Barcelona, SpainHQ checked Sep 19, 2026	11-50	38 contacts →
	Indirect evidence “Keyweo is a digital marketing agency founded in 2018 and based in Barcelona.” Source: RevenueBase Database · checked Sep 19, 2026
5	Acceseo	Indirect evidence	Alcoy, SpainHQ checked Sep 19, 2026	11-50	31 contacts →
	Indirect evidence “de páginas web accesibles.” Source: RevenueBase Database · checked Sep 19, 2026
6	Human Level Communications	Indirect evidence	Sant Joan D'alacant, SpainHQ checked Sep 19, 2026	11-50	31 contacts →
	Indirect evidence “Since 2001, we've been boosting the online discoverability of leading international companies and media outlets.” Source: RevenueBase Database · checked Sep 19, 2026
7	boluda.com	Strong evidence	Mataró, SpainHQ checked Sep 19, 2026	1-10	25 contacts →
	Strong evidence “Joan Boluda, Consultor de Marketing OnlineEspecializado en Posicionamiento Natural (SEO), Pago Por Clic (PPC), Redes Sociales (SMO) y Email Marketing.Si tienes claro tu plan de…” Source: RevenueBase Database · checked Sep 19, 2026
8	Convertix	Strong evidence	Madrid, SpainHQ checked Sep 19, 2026	11-50	23 contacts →
	Strong evidence “Convertix is an International SEO & Performance Marketing Agency with offices in Madrid and Milan serving clients in 20+ markets and 10+ languages.” Source: RevenueBase Database · checked Sep 19, 2026
9	Nubeseo	Strong evidence	Marbella, SpainHQ checked Sep 19, 2026	11-50	22 contacts →
	Strong evidence “Posicionamiento Web SEO, Marketing Online y diseño de páginas web en Marbella.” Source: RevenueBase Database · checked Sep 19, 2026
10	Liten Lemon	Indirect evidence	Madrid, SpainHQ checked Sep 19, 2026	1-10	21 contacts →
	Indirect evidence “Liten Lemon es una agencia de marketing digital ubicada en Madrid, España.” Source: RevenueBase Database · checked Sep 19, 2026
11	Sembi Comunicación	Strong evidence	Bilbao, SpainHQ checked Sep 19, 2026	1-10	20 contacts →
	Strong evidence “Sembi Communication is a Digital Marketing Agency experts in SEO (Search Engine Optimization),(Search Engine Marketing), Media Digital Content, Web Design, Community Manager &…” Source: RevenueBase Database · checked Sep 19, 2026
12	Yoseo Marketing	Indirect evidence	Madrid, SpainHQ checked Sep 19, 2026	11-50	19 contacts →
	Indirect evidence “En YoSEOMarketing, somos la agencia líder en transformación digital, especializada en posicionamiento y resultados sostenibles.” Source: RevenueBase Database · checked Sep 19, 2026
13	Ecoeureka	Strong evidence	Madrid, SpainHQ checked Sep 19, 2026	11-50	17 contacts →
	Strong evidence “Agencia de Marketing Digital \| Hacemos SEO, SEM, Diseño Web, Redes Sociales, Vídeo Marketing, Email Marketing y Mantenimiento de Sistemas.” Source: RevenueBase Database · checked Sep 19, 2026
14	Positio Marketing Online Agencia SEO Y SEM	Strong evidence	Llanera, SpainHQ checked Sep 19, 2026	11-50	16 contacts →
	Strong evidence “Positio, agencia de marketing de contenidos especializada en posicionamiento SEO y SEM-PPC, analítica web, Social Media y blogging.” Source: RevenueBase Database · checked Sep 19, 2026
15	SEO Coaching	Strong evidence	Barcelona, SpainHQ checked Sep 19, 2026	11-50	15 contacts →
	Strong evidence “Seocoaching es una empresa especializada en posicionamiento web con resultados comprobados y servicios SEO garantizados.” Source: RevenueBase Database · checked Sep 19, 2026
16	Agencia Egos Marketing	Strong evidence	Gijón, SpainHQ checked Sep 19, 2026	11-50	15 contacts →
	Strong evidence “Agencia de Marketing Online, Posicionamiento SEO, Local SEO, SEM, Gestión de Redes Sociales, Diseño Gráfico, Diseño Web y e-Commerce.” Source: RevenueBase Database · checked Sep 19, 2026
17	Socialonce Marketing&internet	Strong evidence	Zaragoza, SpainHQ checked Sep 19, 2026	11-50	15 contacts →
	Strong evidence “Somos un equipo de profesionales, técnicos en informática, programadores de software, diseñadores web y técnicos en posicionamiento SEO y marketing Online con amplia experiencia…” Source: RevenueBase Database · checked Sep 19, 2026
18	Novaigrup	Indirect evidence	Las Franquesas Del Vallés, SpainHQ checked Sep 19, 2026	11-50	14 contacts →
	Indirect evidence “Novaigrup, agencia de ingeniería web y marketing en Internet.” Source: RevenueBase Database · checked Sep 19, 2026
19	The Last Dock	Strong evidence	Bilbao, SpainHQ checked Sep 19, 2026	11-50	14 contacts →
	Strong evidence “Somos una agencia de Marketing Digital Somos especialistas en Posicionamiento Web (SEO) Somos especialistas en Diseño Web Somos especialistas en Publicidad en Google Adwords Somos…” Source: RevenueBase Database · checked Sep 19, 2026
20	Estudio34	Indirect evidence	Barcelona, SpainHQ checked Sep 19, 2026	11-50	13 contacts →
	Indirect evidence “Estudio34 is an online marketing agency based in Barcelona (Spain) that provides digital marketing services to businesses that either need to improve their online visibility or…” Source: RevenueBase Database · checked Sep 19, 2026
21	Localmetric Agencia DE SEO Local	Strong evidence	Madrid, SpainHQ checked Sep 19, 2026	1-10	13 contacts →
	Strong evidence “Localmetric es una agencia de marketing digital experta en SEO Local.” Source: RevenueBase Database · checked Sep 19, 2026
22	Optimanova Solutions	Indirect evidence	Puerto De La Cruz, SpainHQ checked Sep 19, 2026	11-50	13 contacts →
	Indirect evidence “In Optimanova we understand Web Optimisation as a way to take the best advantage from your website.” Source: RevenueBase Database · checked Sep 19, 2026
23	Grouber Marketing	Indirect evidence	Madrid, SpainHQ checked Sep 19, 2026	11-50	12 contacts →
	Indirect evidence “En Grouber Marketing, te ayudamos con una estrategia específica para tu negocio.” Source: RevenueBase Database · checked Sep 19, 2026
24	Softalian	Strong evidence	Valencia, SpainHQ checked Sep 19, 2026	1-10	11 contacts →
	Strong evidence “Softalian es una agencia de SEO y de marketing online.” Source: RevenueBase Database · checked Sep 19, 2026
25	Fast Digital Group	Indirect evidence	Barcelona, SpainHQ checked Sep 19, 2026	1-10	11 contacts →
	Indirect evidence “Fast Digital WS es una agencia de Marketing Online especializada en el diseño y gestión de estrategias de marketing online, creación de webs corporativas y consultoría.” Source: RevenueBase Database · checked Sep 19, 2026

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: SEO services companies. 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 SEO services companies.
Partial evidence: Its own public description names part of SEO services companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name SEO services companies. 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 790 SEO services companies based in Spain

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SEO services companies based in Spain at a glance

As of Sep 19, 2026

13.9%Verified-email coverage

3.8Average contacts per company

1-10Median size (employees)

18.1%Largest-city concentration · Madrid

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

697

11-50

51-200

501-1,000

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 790 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 SEO services companies, 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 “SEO services companies”. 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 SEO services companies), 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 SEO services companies, 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, 414 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 19, 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.

SEO services companies by metro

SEO services companies in Madrid143
SEO services companies in Barcelona95
SEO services companies in Valencia38

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 SEO services companies, 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 SEO services companies are there based in Spain?

RevenueBase identified 790 SEO services companies 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?

Bigseo, headquartered in Barcelona, tops this list with the largest team on record.

Which city has the most SEO services companies?

Madrid leads with 143 headquartered companies, followed by Barcelona (95) and Valencia (38).

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 414 verified decision-maker contacts tracked across these 790 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 19, 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.