Company lists · Data refreshed September 2026

Top 25 SEO for international companies based in Spain

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

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 289 companies tracked

RevenueBase identified 289 SEO for international companies headquartered in Spain as of September 2026 and tracks 1,190 professional contacts across them, including 224 with verified work emails. Madrid is the largest hub.

This list covers SEO for international 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 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.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 21, 2026 86% judged on-target in blind review

289Companies

1,190Contacts tracked

224Verified emails

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The 25 largest SEO for international companies based in Spain

Ranked by team size

Top 25 of 289 SEO for international companies based in Spain, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to SEO for international 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	Partial evidence	Barcelona, SpainHQ checked Sep 21, 2026	51-200	108 contacts →
	Partial evidence “En nuestra agencia SEO en Barcelona somos unos apasionados del posicionamiento web.” Source: RevenueBase Database · checked Sep 21, 2026
2	Interamplify	Indirect evidence	Alhama De Murcia, SpainHQ checked Sep 21, 2026	51-200	71 contacts →
	Indirect evidence “Since 2012, at Interamplify, we have become strategic partners for brands and companies seeking to expand digitally on a global scale.” Source: RevenueBase Database · checked Sep 21, 2026
3	agenciaseo.eu	Indirect evidence	Valencia, SpainHQ checked Sep 21, 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 21, 2026
4	Keyweo	Indirect evidence	Barcelona, SpainHQ checked Sep 21, 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 21, 2026
5	Human Level Communications	Partial evidence	Sant Joan D'alacant, SpainHQ checked Sep 21, 2026	11-50	31 contacts →
	Partial evidence “Since 2001, we've been boosting the online discoverability of leading international companies and media outlets.” Source: RevenueBase Database · checked Sep 21, 2026
6	Convertix	Strong evidence	Madrid, SpainHQ checked Sep 21, 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 21, 2026
7	Nubeseo	Partial evidence	Marbella, SpainHQ checked Sep 21, 2026	11-50	22 contacts →
	Partial evidence “Posicionamiento Web SEO, Marketing Online y diseño de páginas web en Marbella.” Source: RevenueBase Database · checked Sep 21, 2026
8	Sembi Comunicación	Partial evidence	Bilbao, SpainHQ checked Sep 21, 2026	1-10	20 contacts →
	Partial 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 21, 2026
9	Èmfasi Comunicació Digital	Indirect evidence	Sabadell, SpainHQ checked Sep 21, 2026	11-50	15 contacts →
	Indirect evidence “Services of Digital Strategy, Online Marketing and Development of websites and applications in web environment and mobile applications.” Source: RevenueBase Database · checked Sep 21, 2026
10	SEO Coaching	Partial evidence	Barcelona, SpainHQ checked Sep 21, 2026	11-50	15 contacts →
	Partial evidence “Seocoaching es una empresa especializada en posicionamiento web con resultados comprobados y servicios SEO garantizados.” Source: RevenueBase Database · checked Sep 21, 2026
11	Novaigrup	Indirect evidence	Las Franquesas Del Vallés, SpainHQ checked Sep 21, 2026	11-50	14 contacts →
	Indirect evidence “Novaigrup, agencia de ingeniería web y marketing en Internet.” Source: RevenueBase Database · checked Sep 21, 2026
12	Estudio34	Indirect evidence	Barcelona, SpainHQ checked Sep 21, 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 21, 2026
13	Optimanova Solutions	Indirect evidence	Puerto De La Cruz, SpainHQ checked Sep 21, 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 21, 2026
14	Agencia Seoclic	Indirect evidence	Murcia, SpainHQ checked Sep 21, 2026	1-10	11 contacts →
	Indirect evidence “AGENCIA SEOCLIC Somos una Agencia especializada en posicionamiento online, y que cubrimos diferentes servicios relacionados con el Marketing Digital.” Source: RevenueBase Database · checked Sep 21, 2026
15	Dobleseo	Partial evidence	Vilablareix, SpainHQ checked Sep 21, 2026	1-10	10 contacts →
	Partial evidence “De la mà d’Eva Olivares i Xevi Sañé neix la primera agència 100% SEO a Girona.” Source: RevenueBase Database · checked Sep 21, 2026
16	Suma Y Sube	Partial evidence	Valencia, SpainHQ checked Sep 21, 2026	1-10	10 contacts →
	Partial evidence “Agencia especializada en el mundo del marketing online: SEO, CRO y Analítica Web.” Source: RevenueBase Database · checked Sep 21, 2026
17	Lacomunicación	Partial evidence	Quart De Poblet, SpainHQ checked Sep 21, 2026	11-50	9 contacts →
	Partial evidence “Lacomunicación es una agencia de Marketing Digital en Valencia pionera en la consultoría SEO y el marketing digital, servicios que llevamos prestando desde 2004.” Source: RevenueBase Database · checked Sep 21, 2026
18	Seoleverage	Strong evidence	Madrid, SpainHQ checked Sep 21, 2026	11-50	9 contacts →
	Strong evidence “SEOLeverage is an International e-commerce SEO agency with over 20 years of SEO experience.” Source: RevenueBase Database · checked Sep 21, 2026
19	TU Posicionamiento WEB	Indirect evidence	Madrid, SpainHQ checked Sep 21, 2026	11-50	9 contacts →
	Indirect evidence “Tu Posicionamiento Web: Empresa de Posicionamiento web ubicada en Madrid con una amplia experiencia en Marketing online.” Source: RevenueBase Database · checked Sep 21, 2026
20	Santaconcha Digital Performance	Indirect evidence	Granollers, SpainHQ checked Sep 21, 2026	11-50	8 contacts →
	Indirect evidence “Somos el Equipo A, un grupo de especialistas apasionados por el desarrollo web y el marketing digital, entrenados para llevar tu presencia digital a otro nivel y obsesionados con…” Source: RevenueBase Database · checked Sep 21, 2026
21	Jf-Digital Agencia DE Marketing Digital	Partial evidence	Barcelona, SpainHQ checked Sep 21, 2026	1-10	7 contacts →
	Partial evidence “En nuestra Agencia de Marketing Digital, diseñamos e implementamos la estrategia de posicionamiento SEO en buscadores que tu sitio Web o eCommerce necesita para poder mejorar su…” Source: RevenueBase Database · checked Sep 21, 2026
22	Interactiva	Partial evidence	Torrelavega, SpainHQ checked Sep 21, 2026	1-10	7 contacts →
	Partial evidence “Interactivaclic es una agencia ubicada en Cantabria dedicada al marketing online, somos especialistas en posicionamiento en buscadores (search engine optimization - SEO)…” Source: RevenueBase Database · checked Sep 21, 2026
23	Helloseosem	Indirect evidence	Valencia, SpainHQ checked Sep 21, 2026	1-10	7 contacts →
	Indirect evidence “En helloseosem evolucionamos tu negocio para la nueva era digital.” Source: RevenueBase Database · checked Sep 21, 2026
24	Display None Studio	Partial evidence	Valencia/valència, SpainHQ checked Sep 21, 2026	1-10	7 contacts →
	Partial evidence “Si lo que te gusta es el SEO, también le damos caña, toda web que sale de nuestro horno lleva el sello FAST AS A SHARK.” Source: RevenueBase Database · checked Sep 21, 2026
25	Posittion	Partial evidence	Madrid, SpainHQ checked Sep 21, 2026	1-10	6 contacts →
	Partial evidence “We are an Exclusive SEO Agency with presence in Argentina and Spain, working for the main markets of Latin America and Europe.” Source: RevenueBase Database · checked Sep 21, 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 for international 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 for international companies.
Partial evidence: Its own public description names part of SEO for international companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name SEO for international 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 289 SEO for international companies based in Spain

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SEO for international companies based in Spain at a glance

As of Sep 21, 2026

18.8%Verified-email coverage

4.1Average contacts per company

1-10Median size (employees)

14.9%Largest-city concentration · Madrid

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

250

11-50

51-200

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 289 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 for international 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 for international 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 for international 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 for international 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, 224 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.

SEO for international companies by metro

SEO for international companies in Madrid43
SEO for international companies in Barcelona42

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 for international 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 for international companies are there based in Spain?

RevenueBase identified 289 SEO for international 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 for international companies?

Madrid leads with 43 headquartered companies, followed by Barcelona (42) and Valencia (17).

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 224 verified decision-maker contacts tracked across these 289 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.