Company lists · Data verified August 2026

Top 25 B2B SEO agencies based in Spain

Name: B2B SEO agencies based in Spain
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 603 companies tracked

There are 603 B2B SEO agencies headquartered in Spain (RevenueBase, August 2026). RevenueBase tracks 2,395 professional contacts across them, including 353 with verified work emails and 75 with mobile numbers. Madrid is the largest hub.

This list covers B2B SEO agencies headquartered in Spain, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Data current as of August 28, 2026.

603Companies

2,395Contacts tracked

353Verified emails

75Mobile numbers

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The 25 largest B2B SEO agencies based in Spain

Ranked by team size

Top 25 of 603 B2B SEO agencies based in Spain, ranked by team size, largest first. Data verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	Bigseo	Barcelona	51-200	110	17
2	internet.republica	Madrid	51-200	73	32
3	Connext Marketing Y Ventas B2B	Chirivella	11-50	41	9
4	Keyweo	Barcelona	11-50	39	10
5	agenciaseo.eu	Valencia	11-50	37	12
6	Visibilidadon	Girona	11-50	26	20
7	Multiplicalia	Seville	11-50	24	1
8	Nubeseo	Marbella	11-50	22	13
9	Connection H2h Human 2 Human	Madrid	11-50	19	7
10	Loading Corp	Terrassa	11-50	17	4
11	Backlinks Global	Spain	11-50	17	3
12	Positio Marketing Online Agencia SEO Y SEM	Llanera	11-50	15	4
13	Nothingad Consultoría DE Marketing B2B	Barcelona	11-50	15	3
14	SEO Coaching	Barcelona	11-50	15	2
15	Baobab Marketing	Ibi	11-50	15	1
16	Estudio34	Barcelona	11-50	13	7
17	ADI Revolution	Bilbao	11-50	13	1
18	Optimanova Solutions	Puerto De La Cruz	11-50	12	6
19	Grouber Marketing	Ciudad Real	11-50	12	2
20	Mr. Landon The Agency Partner	n/a	11-50	10	4
21	Lacomunicación	Quart De Poblet	11-50	9	8
22	Adverbis Spain	Alicante	11-50	9	1
23	Rex4media	Pollensa	11-50	8	6
24	Adrenalina Marketing Online	Barcelona	11-50	8	3
25	Orchid BOX	Barcelona	11-50	8	2

Showing 25 of 603 B2B SEO agencies based in Spain

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B2B SEO agencies based in Spain at a glance

As of Aug 28, 2026

1-10Median size (employees)

MadridLargest hub · 115 HQs

75Contacts with mobile numbers

8Emails re-verified in last 30 days

Companies by employee count

1-10

512

11-50

51-200

201-500

B2B SEO agencies by metro

Metro	Companies
B2B SEO agencies in Madrid	115
B2B SEO agencies in Barcelona	76
B2B SEO agencies in Valencia	31
B2B SEO agencies in Alicante	15
B2B SEO agencies in Malaga	14
B2B SEO agencies in Sevilla	12
B2B SEO agencies in Bilbao	11

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “B2B SEO agencies”, with match quality audited by blind human judging, and headquartered in Spain.
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: Contact records re-verify on a rolling cadence; 8 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

How many B2B SEO agencies are there based in Spain?

There are 603 B2B SEO agencies headquartered in Spain as of August 2026 (RevenueBase).

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 B2B SEO agencies?

Madrid leads with 115 headquartered companies, followed by Barcelona (76) and Valencia (31).

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 353 verified decision-maker contacts tracked across these 603 companies.

How current is this list?

The list is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 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, the same data that powers RevenueBase's B2B data products and the free research portal.