Company lists · Data verified August 2026

Top 25 Defense cybersecurity companies based in Spain

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

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 209 companies tracked

There are 209 defense cybersecurity companies headquartered in Spain (RevenueBase, August 2026). RevenueBase tracks 4,051 professional contacts across them, including 779 with verified work emails and 40 with mobile numbers. Madrid is the largest hub.

This list covers defense cybersecurity companies 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.

209Companies

4,051Contacts tracked

779Verified emails

40Mobile numbers

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The 25 largest defense cybersecurity companies based in Spain

Ranked by team size

Top 25 of 209 defense cybersecurity companies 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	SIA Group	Alcobendas	1,001-5,000	704	31
2	Advens	Barcelona	501-1,000	588	314
3	Alhambra IT	Madrid	201-500	228	26
4	S21sec	Madrid	201-500	192	36
5	A3sec	Madrid	51-200	122	24
6	Tarlogic	n/a	51-200	122	21
7	A2secure	Madrid	51-200	115	24
8	Integración Tecnológica Empresarial, S.L	Mostoles Mostoles	51-200	113	16
9	Innotec Security	Madrid	501-1,000	105	14
10	Hispasec	Malaga	51-200	68	11
11	Neverhack Spain	Barcelona	51-200	65	13
12	Bedisruptive	Madrid	51-200	54	26
13	3digits	Palma De Mallorca	51-200	50	13
14	Atalanta Cybersecurity & Digital	Madrid	51-200	49	11
15	Gestinet Internet Informàtica	Valencia	51-200	48	12
16	Ackcent Cybersecurity	n/a	51-200	48	12
17	Derten	Vitoria-Gasteiz	11-50	48	8
18	Lazarus Technology	San Sebastian De Los Reyes	51-200	43	12
19	Cyberpeace	Sant Cugat Del Valles	51-200	41	8
20	Zepo Intelligence	Madrid	11-50	39	3
21	Apolo Cybersecurity	Barcelona	11-50	37	5
22	Serval Networks	Alcobendas	51-200	28	3
23	Jakincode	Vitoria-Gasteiz	11-50	26	3
24	ITRES	Murcia	11-50	25	3
25	Hard2bit Cybersecurity	Leganes	11-50	21	2

Showing 25 of 209 defense cybersecurity companies based in Spain

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Defense cybersecurity companies based in Spain at a glance

As of Aug 28, 2026

1-10Median size (employees)

MadridLargest hub · 60 HQs

40Contacts with mobile numbers

1Emails re-verified in last 30 days

Companies by employee count

1-10

114

11-50

51-200

201-500

501-1,000

1,001-5,000

Defense cybersecurity companies by metro

Metro	Companies
Defense cybersecurity companies in Madrid	60
Defense cybersecurity companies in Barcelona	30
Defense cybersecurity companies in Malaga	12
Defense cybersecurity companies in Murcia	6
Defense cybersecurity companies in Valencia	5
Defense cybersecurity companies in San Sebastian De Los Reyes	3
Defense cybersecurity companies in Palma	3

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 “defense cybersecurity companies”, 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; 1 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 defense cybersecurity companies are there based in Spain?

There are 209 defense cybersecurity companies headquartered in Spain as of August 2026 (RevenueBase).

What is the largest company on this list?

SIA Group, headquartered in Alcobendas, tops this list with the largest team on record.

Which city has the most defense cybersecurity companies?

Madrid leads with 60 headquartered companies, followed by Barcelona (30) and Malaga (12).

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 779 verified decision-maker contacts tracked across these 209 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.