Company lists · Data refreshed September 2026

Top 25 International SEO companies based in Spain

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

Compiled by the RevenueBase Data Team Data refreshed Sep 4, 2026 199 companies tracked

RevenueBase identified 199 international SEO companies headquartered in Spain as of September 2026 and tracks 1,088 professional contacts across them, including 179 with verified work emails and 36 with mobile numbers. Madrid is the largest hub.

This list covers international SEO 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, 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

199Companies

1,088Contacts tracked

179Verified emails

36Mobile numbers

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The 25 largest international SEO companies based in Spain

Ranked by team size

Top 25 of 199 international SEO companies 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 companies: 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	ATLSPartial evidence	Barcelona, SpainHQ checked Sep 4, 2026	51-200	86
	“ATLS is the strategic partner that drives business expansion into international markets, combining advanced technology, content localization, and multilingual digital marketing.” Source: company website · checked Sep 4, 2026
3	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
4	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
5	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
6	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
7	Liten LemonIndirect evidence	Madrid, SpainHQ checked Sep 4, 2026	1-10	21
	“Liten Lemon es una agencia de marketing digital ubicada en Madrid, España.” Source: company website · checked Sep 4, 2026
8	Sembi ComunicaciónPartial evidence	Bilbao, SpainHQ checked Sep 4, 2026	1-10	20
	“Sembi Communication is a Digital Marketing Agency experts in SEO (Search Engine Optimization),(Search Engine Marketing), Media Digital Content, Web Design, Community Manager &…” Source: company website · checked Sep 4, 2026
9	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
10	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
11	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
12	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
13	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
14	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
15	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
16	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
17	HelloseosemIndirect evidence	Valencia, SpainHQ checked Sep 4, 2026	1-10	7
	“En helloseosem evolucionamos tu negocio para la nueva era digital.” Source: company website · checked Sep 4, 2026
18	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
19	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
20	AM ConsultoresPartial evidence	Barcelona, SpainHQ checked Sep 4, 2026	1-10	6
	“Trabajar únicamente centrado en el SEO en los últimos 20 años, en todo tipo de proyectos y sectores, me ha permitido adquirir EXPERIENCIA (si, en mayúsculas) y un pensamiento…” Source: company website · checked Sep 4, 2026
21	Jf-Digital Agencia DE Marketing DigitalPartial evidence	Barcelona, SpainHQ checked Sep 4, 2026	1-10	6
	“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: company website · checked Sep 4, 2026
22	DavilacIndirect evidence	Madrid, SpainHQ checked Sep 4, 2026	1-10	3
	“Davilac es una agencia especializada en Marketing en Internet desde 2004, que apuesta por la especialización y la investigación como principal rasgo diferencial.” Source: company website · checked Sep 4, 2026
23	SeqmentaPartial evidence	Vic, SpainHQ checked Sep 4, 2026	1-10	3
	“estratègies digitals · seo · sem · social ·” Source: company website · checked Sep 4, 2026
24	SEO FiableIndirect evidence	Sant Adria De Besos, SpainHQ checked Sep 4, 2026	1-10	3
	“Te inquieta ser invisible para tus clientes?” Source: company website · checked Sep 4, 2026
25	ClickcrowsIndirect evidence	Barcelona, SpainHQ checked Sep 4, 2026	1-10	3
	“At ClickCrows, we're not just passionate about helping businesses thrive in the digital world, we’re obsessed with it!” Source: company website · checked Sep 4, 2026

Showing 25 of 199 international SEO companies based in Spain

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International SEO companies based in Spain at a glance

As of Sep 4, 2026

1-10Median size (employees)

MadridLargest hub · 42 HQs

36Contacts with mobile numbers

Sep 4, 2026Data refreshed

Companies by employee count

1-10

163

11-50

51-200

Verified emails by last verification

0–30

31–60

61–90

90–180

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 companies, 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 companies”. 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 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 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, 179 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 companies by metro

International SEO companies in Madrid42
International SEO companies in Barcelona28

Frequently asked

How many international SEO companies are there based in Spain?

RevenueBase identified 199 international SEO 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 international SEO companies?

Madrid leads with 42 headquartered companies, followed by Barcelona (28) and Valencia (8).

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 179 verified decision-maker contacts tracked across these 199 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.