Company lists · Data refreshed August 2026

Top 25 Api security companies based in Spain

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

Compiled by the RevenueBase Data Team Data refreshed Aug 31, 2026 98 companies tracked

RevenueBase identified 98 api security companies headquartered in Spain as of August 2026 and tracks 1,678 professional contacts across them, including 299 with verified work emails and 65 with mobile numbers. Madrid is the largest hub.

This list covers api security 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 August 31, 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 RevenueBase Smart Search rating on every row Refreshed Aug 31, 2026 86% judged on-target in blind review

98Companies

1,678Contacts tracked

299Verified emails

65Mobile numbers

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The 25 largest api security companies based in Spain

Ranked by team size

Top 25 of 98 api security companies based in Spain, ranked by team size, largest first. Data refreshed Aug 31, 2026. RevenueBase Smart Search rates how each company's information relates to api security 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	S21sec	Partial evidence	Madrid, Spain	201-500	192 contacts →
	Partial evidence “S21Sec, Cyber Solutions by Thales, is a leading European Cybersecurity pure-player, with more than 400 security experts and an Iberian SOC.” Source: RevenueBase Database · checked Aug 31, 2026
2	Attackiq	Partial evidence	Barcelona, Spain	51-200	158 contacts →
	Partial evidence “AttackIQ® is trusted by top organizations worldwide to validate security controls in real time.” Source: RevenueBase Database · checked Aug 31, 2026
3	A3sec	Indirect evidence	Madrid, Spain	51-200	122 contacts →
	Indirect evidence “Empresa de Ciberseguridad soportada en Datos.” Source: RevenueBase Database · checked Aug 31, 2026
4	Tarlogic	Indirect evidence	Spain	51-200	122 contacts →
	Indirect evidence “Tarlogic is an international company that specializes in cyber intelligence and cybersecurity.” Source: RevenueBase Database · checked Aug 31, 2026
5	A2secure	Indirect evidence	Madrid, Spain	51-200	115 contacts →
	Indirect evidence “A2SECURE is a global cybersecurity expert based in Spain, founded in 2009 with private capital and now established as a leading MSSP provider.” Source: RevenueBase Database · checked Aug 31, 2026
6	Innotec Security	Indirect evidence	Madrid, Spain	501-1,000	105 contacts →
	Indirect evidence “Si andas por aquí, significa que te dedicas a la ciberseguridad, que te gustaría trabajar con nosotros o quizá que necesitas que te ayudemos con alguno de nuestros servicios.” Source: RevenueBase Database · checked Aug 31, 2026
7	Hispasec	Indirect evidence	Malaga, Spain	51-200	68 contacts →
	Indirect evidence “Hispasec juega un papel fundamental en la historia de la ciberseguridad en España desde que nacimos hace 25 años.” Source: RevenueBase Database · checked Aug 31, 2026
8	Neverhack Spain	Indirect evidence	Barcelona, Spain	51-200	65 contacts →
	Indirect evidence “As of 2024, Innovery, a leading group in the Italian and European market with a wide range of solutions and services in the field of cybersecurity, has joined Neverhack.” Source: RevenueBase Database · checked Aug 31, 2026
9	Jtsec Beyond IT Security	Indirect evidence	Granada, Spain	11-50	63 contacts →
	Indirect evidence “We are a cybersecurity company providing consulting and evaluation services under different evaluation methodologies such as LINCE, Common Criteria, FIPS 140-3, PCI-PTS, PCI-CPoC…” Source: RevenueBase Database · checked Aug 31, 2026
10	Ackcent Cybersecurity	Indirect evidence	Spain	51-200	48 contacts →
	Indirect evidence “At Ackcent, we focus exclusively on cybersecurity and on delivering outcomes our clients can measure.” Source: RevenueBase Database · checked Aug 31, 2026
11	Lazarus Technology	Indirect evidence	San Sebastian De Los Reyes, Spain	51-200	43 contacts →
	Indirect evidence “Somos una empresa especializada en ciberseguridad, que acompaña, protege y asesora al cliente en todo su ciclo de vida digital a través de 3 grandes fases: 1.” Source: RevenueBase Database · checked Aug 31, 2026
12	Zepo Intelligence	Indirect evidence	Madrid, Spain	11-50	39 contacts →
	Indirect evidence “The average cost of a data breach to your business can range from to $1.24 million.” Source: RevenueBase Database · checked Aug 31, 2026
13	Apolo Cybersecurity	Indirect evidence	Barcelona, Spain	11-50	37 contacts →
	Indirect evidence “Somos expertos en ciberseguridad impulsada por IA.” Source: RevenueBase Database · checked Aug 31, 2026
14	Optimumtic	Indirect evidence	Barcelona, Spain	11-50	29 contacts →
	Indirect evidence “OptimumTIC es una empresa especialista en CiberSeguridad creada en 2009, dedicada a ofrecer servicios transversales y plataformas gestionadas de los mejores soluciones y equipo…” Source: RevenueBase Database · checked Aug 31, 2026
15	Tecnek Ciberseguridad	Indirect evidence	Madrid, Spain	11-50	20 contacts →
	Indirect evidence “Expertos en seguridad de la información con amplia experiencia en el sector ubicados en Madrid.” Source: RevenueBase Database · checked Aug 31, 2026
16	Hack By Security	Indirect evidence	Valencia, Spain	11-50	18 contacts →
	Indirect evidence “Somos un equipo con más de 20 años de experiencia especializado en servicios de Ciberseguridad y Ethical Hacking.” Source: RevenueBase Database · checked Aug 31, 2026
17	Ciberso	Indirect evidence	Madrid, Spain	1,001-5,000	14 contacts →
	Indirect evidence “Ciberso nace para responder a los desafíos de seguridad que la digitalización acelerada y los nuevos modelos de negocio traen consigo sobre aplicaciones, infraestructuras, datos y…” Source: RevenueBase Database · checked Aug 31, 2026
18	Cross Mind Technology	Indirect evidence	San Sebastian De Los Reyes, Spain	11-50	13 contacts →
	Indirect evidence “At Cross Mind, we understand that every company has unique cybersecurity needs.” Source: RevenueBase Database · checked Aug 31, 2026
19	Alpine Security	Partial evidence	Madrid, Spain	1-10	11 contacts →
	Partial evidence “We are a passionate group of security experts with wide experience in Incident Response, Cybersecurity, Infrastructure, Industrial Security and Red Team- We combine our efforts…” Source: RevenueBase Database · checked Aug 31, 2026
20	ZEROD	Partial evidence	Barcelona, Spain	11-50	11 contacts →
	Partial evidence “Premium Security Testing & Compliance.” Source: RevenueBase Database · checked Aug 31, 2026
21	CYBER	Indirect evidence	Barcelona, Spain	11-50	9 contacts →
	Indirect evidence “cyber & is a company specializing in cybersecurity and digital resilience services, designed to protect business growth in complex environments.” Source: RevenueBase Database · checked Aug 31, 2026
22	Synergial Cybersecurity	Indirect evidence	Olesa De Montserrat, Spain	11-50	8 contacts →
	Indirect evidence “Synergial s’especialitza a oferir solucions avançades de ciberseguretat per protegir les empreses davant d’una àmplia varietat d’amenaces digitals.” Source: RevenueBase Database · checked Aug 31, 2026
23	Cibinar	Indirect evidence	Murcia, Spain	11-50	8 contacts →
	Indirect evidence “Somos una consultora tecnológica especializada en ciberseguridad e inteligencia artificial.” Source: RevenueBase Database · checked Aug 31, 2026
24	Cibersare	Indirect evidence	Barakaldo, Spain	1-10	8 contacts →
	Indirect evidence “Bienvenidos a Cibersare, una empresa de ciberseguridad especializada en PYMES.” Source: RevenueBase Database · checked Aug 31, 2026
25	Blackdogs	Indirect evidence	Barcelona, Spain	1-10	8 contacts →
	Indirect evidence “Somos una Startup tecnológica dedicada a la ciberseguridad y a la creación de soluciones integrales y personalizadas.” Source: RevenueBase Database · checked Aug 31, 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: api security 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 api security companies.
Partial evidence: Its own public description names part of api security companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name api security 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 98 api security companies based in Spain

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Api security companies based in Spain at a glance

As of Aug 31, 2026

17.8%Verified-email coverage

3.9%Mobile-number coverage

17.1Average contacts per company

1-10Median size (employees)

32.7%Largest-city concentration · Madrid

Aug 31, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

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 api security 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 “api security 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 api security 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 api security 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, 299 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 August 31, 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.

Api security companies by metro

Api security companies in Madrid32

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 api security 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 api security companies are there based in Spain?

RevenueBase identified 98 api security companies headquartered in Spain as of August 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?

S21sec, headquartered in Madrid, tops this list with the largest team on record.

Which city has the most api security companies?

Madrid leads with 32 headquartered companies, followed by Barcelona (18) and Malaga (6).

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 299 verified decision-maker contacts tracked across these 98 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on August 31, 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.