Company lists · Data verified August 2026

Top 10 Api security companies based in Madrid, Spain

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

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 32 companies tracked

There are 32 api security companies headquartered in Madrid, Spain (RevenueBase, August 2026). RevenueBase tracks 668 professional contacts across them, including 113 with verified work emails and 8 with mobile numbers. Madrid is the largest hub.

This list covers api security companies headquartered in Madrid, 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.

32Companies

668Contacts tracked

113Verified emails

8Mobile numbers

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The 10 largest api security companies based in Madrid, Spain

Ranked by team size

Top 10 of 32 api security companies based in Madrid, 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	S21sec	Madrid	201-500	192	36
2	A3sec	Madrid	51-200	122	24
3	A2secure	Madrid	51-200	115	24
4	Innotec Security	Madrid	501-1,000	105	14
5	Zepo Intelligence	Madrid	11-50	39	3
6	Tecnek Ciberseguridad	Madrid	11-50	20	3
7	Ciberso	Madrid	1,001-5,000	14	1
8	Alpine Security	Madrid	1-10	11	5
9	AO Data Cloud	Madrid	11-50	4	1
10	Havenio	Madrid	1-10	2	2

Showing 10 of 32 api security companies based in Madrid, Spain

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Api security companies based in Madrid, Spain at a glance

As of Aug 28, 2026

1-10Median size (employees)

MadridLargest hub · 32 HQs

8Contacts with mobile numbers

0Emails re-verified in last 30 days

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

Api security companies by metro in Spain

Metro	Companies
Api security companies in Madrid	32
Api security companies in Barcelona	18
Api security companies in Malaga	6
Api security companies in Murcia	3
Api security companies in Valencia	2
Api security companies in San Sebastian De Los Reyes	2
Api security companies in Pozuelo De Alarcon	1

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 “api security companies”, with match quality audited by blind human judging, and headquartered in Madrid, 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; 0 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 api security companies are there based in Madrid, Spain?

There are 32 api security companies headquartered in Madrid, Spain as of August 2026 (RevenueBase).

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 113 verified decision-maker contacts tracked across these 32 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.