Company lists · Data refreshed September 2026

Top 25 International SEO agencies based in Spain

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

Compiled by the RevenueBase Data Team Data refreshed Sep 4, 2026 337 companies tracked

RevenueBase identified 337 international SEO agencies headquartered in Spain as of September 2026 and tracks 1,571 professional contacts across them, including 280 with verified work emails and 53 with mobile numbers. Madrid is the largest hub.

This list covers international SEO agencies 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, how directly it supports the match, and when it was last checked. Data refreshed September 4, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 Match evidence on every row Refreshed Sep 4, 2026 86% judged on-target in blind review

337Companies

1,571Contacts tracked

280Verified emails

53Mobile numbers

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The 25 largest international SEO agencies based in Spain

Ranked by team size

Top 25 of 337 international SEO agencies based in Spain, ranked by team size, largest first. Data refreshed Sep 4, 2026. Evidence rates how directly each company's own description names international SEO agencies: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#	Company	Headquarters	Employees	Contacts
1	BigseoPartial evidence	Barcelona, SpainHQ checked Sep 4, 2026	51-200	110
	“En nuestra agencia SEO en Barcelona somos unos apasionados del posicionamiento web.” Source: company website · checked Sep 4, 2026
2	Súmate Marketing OnlineIndirect evidence	Villamayor De Armuna, SpainHQ checked Sep 4, 2026	51-200	80
	“SÚMATE es una agencia de marketing online orientada a resultados medibles.” Source: company website · checked Sep 4, 2026
3	internet.republicaIndirect evidence	Madrid, SpainHQ checked Sep 4, 2026	51-200	73
	“25 years of experience in Digital Marketing, Search Engines, Social Media, Performance, e-Commerce, Media, Content… Our ™ approach (enhanced by AI) integrates Content, Media and…” Source: company website · checked Sep 4, 2026
4	InteramplifyIndirect evidence	Alhama De Murcia, SpainHQ checked Sep 4, 2026	51-200	73
	“Since 2012, at Interamplify, we have become strategic partners for brands and companies seeking to expand digitally on a global scale.” Source: company website · checked Sep 4, 2026
5	KeyweoIndirect evidence	Barcelona, SpainHQ checked Sep 4, 2026	11-50	39
	“Keyweo is a digital marketing agency founded in 2018 and based in Barcelona.” Source: company website · checked Sep 4, 2026
6	agenciaseo.euIndirect evidence	Valencia, SpainHQ checked Sep 4, 2026	11-50	37
	“Esta empresa se creó para dar respuesta a una necesidad cada vez más demandada: el posicionamiento web.” Source: company website · checked Sep 4, 2026
7	Human Level CommunicationsPartial evidence	Dalacant, SpainHQ checked Sep 4, 2026	11-50	30
	“Since 2001, we've been boosting the online discoverability of leading international companies and media outlets.” Source: company website · checked Sep 4, 2026
8	ConvertixStrong evidence	Madrid, SpainHQ checked Sep 4, 2026	11-50	23
	“Convertix is an International SEO & Performance Marketing Agency with offices in Madrid and Milan serving clients in 20+ markets and 10+ languages.” Source: company website · checked Sep 4, 2026
9	MarketingpublicidadIndirect evidence	Sevilla, SpainHQ checked Sep 4, 2026	11-50	18
	“TúEstásOn Somos una agencia de publicidad y marketing online especializada en Internet.” Source: company website · checked Sep 4, 2026
10	Èmfasi Comunicació DigitalIndirect evidence	Sabadell, SpainHQ checked Sep 4, 2026	11-50	16
	“Services of Digital Strategy, Online Marketing and Development of websites and applications in web environment and mobile applications.” Source: company website · checked Sep 4, 2026
11	ALL AroundPartial evidence	Oviedo, SpainHQ checked Sep 4, 2026	11-50	15
	“An independent, international online marking agency.” Source: company website · checked Sep 4, 2026
12	SEO CoachingPartial evidence	Barcelona, SpainHQ checked Sep 4, 2026	11-50	15
	“Seocoaching es una empresa especializada en posicionamiento web con resultados comprobados y servicios SEO garantizados.” Source: company website · checked Sep 4, 2026
13	Agencia Egos MarketingPartial evidence	Gijón, SpainHQ checked Sep 4, 2026	11-50	14
	“Agencia de Marketing Online, Posicionamiento SEO, Local SEO, SEM, Gestión de Redes Sociales, Diseño Gráfico, Diseño Web y e-Commerce.” Source: company website · checked Sep 4, 2026
14	Estudio34Indirect evidence	Barcelona, SpainHQ checked Sep 4, 2026	11-50	13
	“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: company website · checked Sep 4, 2026
15	Optimanova SolutionsIndirect evidence	Puerto De La Cruz, SpainHQ checked Sep 4, 2026	11-50	12
	“In Optimanova we understand Web Optimisation as a way to take the best advantage from your website.” Source: company website · checked Sep 4, 2026
16	Palo SecoIndirect evidence	Barcelona, SpainHQ checked Sep 4, 2026	11-50	12
	“With roots and inspiration in Barcelona's iconic Pueblo Seco, Palo Seco is a digital marketing agency that empowers businesses like yours to achieve their online goals.” Source: company website · checked Sep 4, 2026
17	DobleseoPartial evidence	Vilablareix, SpainHQ checked Sep 4, 2026	1-10	10
	“De la mà d’Eva Olivares i Xevi Sañé neix la primera agència 100% SEO a Girona.” Source: company website · checked Sep 4, 2026
18	Agencia SeoclicIndirect evidence	Murcia, SpainHQ checked Sep 4, 2026	1-10	10
	“AGENCIA SEOCLIC Somos una Agencia especializada en posicionamiento online, y que cubrimos diferentes servicios relacionados con el Marketing Digital.” Source: company website · checked Sep 4, 2026
19	LacomunicaciónPartial evidence	Quart De Poblet, SpainHQ checked Sep 4, 2026	11-50	9
	“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: company website · checked Sep 4, 2026
20	SeoleverageStrong evidence	Madrid, SpainHQ checked Sep 4, 2026	11-50	9
	“SEOLeverage is an International e-commerce SEO agency with over 20 years of SEO experience.” Source: company website · checked Sep 4, 2026
21	Adrenalina Marketing OnlinePartial evidence	Barcelona, SpainHQ checked Sep 4, 2026	11-50	8
	“En Adrenalina tenemos la firme convicción, de que formar y cohesionar un equipo experto en Seo y Marketing Online, debe ser el principal objetivo de nuestra empresa.” Source: company website · checked Sep 4, 2026
22	PosittionPartial evidence	Madrid, SpainHQ checked Sep 4, 2026	1-10	7
	“We are an Exclusive SEO Agency with presence in Argentina and Spain, working for the main markets of Latin America and Europe.” Source: company website · checked Sep 4, 2026
23	Estudio 27Partial evidence	Oviedo, SpainHQ checked Sep 4, 2026	1-10	7
	“Agencia de marketing digital 360º con expertos en diseño web y posicionamiento SEO y SEM ubicada en Oviedo, Asturias desde el 2015.” Source: company website · checked Sep 4, 2026
24	Display None StudioPartial evidence	SpainHQ checked Sep 4, 2026	1-10	7
	“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: company website · checked Sep 4, 2026
25	InteractivaPartial evidence	Torrelavega, SpainHQ checked Sep 4, 2026	1-10	7
	“Interactivaclic es una agencia ubicada en Cantabria dedicada al marketing online, somos especialistas en posicionamiento en buscadores (search engine optimization - SEO)…” Source: company website · checked Sep 4, 2026

Showing 25 of 337 international SEO agencies based in Spain

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International SEO agencies based in Spain at a glance

As of Sep 4, 2026

1-10Median size (employees)

MadridLargest hub · 61 HQs

53Contacts with mobile numbers

Sep 4, 2026Data refreshed

Companies by employee count

1-10

273

11-50

51-200

Verified emails by last verification

0–30

31–60

61–90

124

90–180

131

180+

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 international SEO agencies, so some rows will be adjacent to the category rather than pure plays. The description and evidence 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 SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in Spain whose own description of what they do matches “international SEO agencies”. Matching reads each company's description, not its industry code or its name.
What we exclude: Companies whose own description does not clearly place them among international SEO agencies, 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 an evidence 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, 280 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 4, 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.

International SEO agencies by metro

International SEO agencies in Madrid61
International SEO agencies in Barcelona53

Frequently asked

How many international SEO agencies are there based in Spain?

RevenueBase identified 337 international SEO agencies 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 international SEO agencies?

Madrid leads with 61 headquartered companies, followed by Barcelona (53) and Valencia (18).

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 280 verified decision-maker contacts tracked across these 337 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 4, 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 SmartSearch, 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.