Company lists · Data refreshed September 2026

Top 25 Telecommunications security services worldwide

RevenueBase identified 5,902 telecommunications security services worldwide as of September 2026 and tracks 90,919 professional contacts across them, including 26,708 with verified work emails. The United States is the largest market and Sao Paulo the largest hub.

This list covers telecommunications security services worldwide, 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 September 29, 2026. Country and city lists for telecommunications security services follow the table.

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 HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 29, 2026 86% judged on-target in blind review
5,902Companies
90,919Contacts tracked
26,708Verified emails
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The 25 largest telecommunications security services worldwide

Ranked by team size
Top 25 of 5,902 telecommunications security services worldwide, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to telecommunications security services: 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.
#CompanyRevenueBase Smart SearchHeadquartersEmployeesContacts
1Indirect evidenceSunnyvale, CA, United StatesHQ checked Sep 29, 202610001+14,289 contacts →

Indirect evidence

“Fortinet makes possible a digital world that we can always trust through its mission to protect people, devices, and data everywhere.”

Source: RevenueBase Database · checked Sep 29, 2026
2Partial evidenceChandler, AZ, United StatesHQ checked Sep 29, 20261,001-5,0004,248 contacts →

Partial evidence

“VIAVI Solutions (NASDAQ: VIAV) is a global leader in both network and service enablement and optical security performance products and solutions.”

Source: RevenueBase Database · checked Sep 29, 2026
3Partial evidenceArlington, VA, United StatesHQ checked Sep 29, 20261,001-5,0002,933 contacts →

Partial evidence

“GTT is a leading networking and security as a service provider for multinational organizations, simply and securely connecting people and machines to data and applications –…”

Source: RevenueBase Database · checked Sep 29, 2026
4Indirect evidence92707 Colombes, GermanyHQ checked Sep 29, 20261,001-5,0002,811 contacts →

Indirect evidence

“Alcatel-Lucent Enterprise provides secure networking and communication solutions which enable organizations and industries to accelerate their operational efficiencies and…”

Source: RevenueBase Database · checked Sep 29, 2026
5Indirect evidenceCiudad De Mexico, MexicoHQ checked Sep 29, 20261,001-5,0001,041 contacts →

Indirect evidence

“A lo largo de 30 años, hemos incursionado y evolucionado en distintas áreas atendiendo en el continente americano a clientes privados, corporativos y sector gobierno.”

Source: RevenueBase Database · checked Sep 29, 2026
6Indirect evidenceHoofddorp, NetherlandsHQ checked Sep 29, 20261,001-5,0001,026 contacts →

Indirect evidence

“Irdeto, a CANAL+ company, is the world leader in digital platform cybersecurity, empowering businesses to innovate for a secure, connected future.”

Source: RevenueBase Database · checked Sep 29, 2026
7Indirect evidenceHod-hasharon, IsraelHQ checked Sep 29, 2026501-1,000856 contacts →

Indirect evidence

“Allot Ltd.(NASDAQ: ALLT, TASE: ALLT) is a provider of leading innovative converged cybersecurity solutions and network intelligence for service providers and enterprises…”

Source: RevenueBase Database · checked Sep 29, 2026
8Indirect evidenceStockholm, SwedenHQ checked Sep 29, 2026501-1,000638 contacts →

Indirect evidence

“Enea is a global specialist in advanced telecom and cybersecurity software, with a vision to make the world’s communications safer and more efficient.”

Source: RevenueBase Database · checked Sep 29, 2026
9Indirect evidenceEssen, GermanyHQ checked Sep 29, 20261,001-5,000623 contacts →

Indirect evidence

“secunet – We are the Guardians of Europe's Digital Freedom.”

Source: RevenueBase Database · checked Sep 29, 2026
10Indirect evidenceHelsinki, FinlandHQ checked Sep 29, 202651-200593 contacts →

Indirect evidence

“We are a European cybersecurity company that helps businesses secure critical data and communications between systems, automated applications, and people with defensive…”

Source: RevenueBase Database · checked Sep 29, 2026
11Indirect evidenceParis, ItalyHQ checked Sep 29, 2026501-1,000586 contacts →

Indirect evidence

“Advens is a European, independent and outstanding leader in cybersecurity.”

Source: RevenueBase Database · checked Sep 29, 2026
12Indirect evidencePortsmouth, NH, United StatesHQ checked Sep 29, 2026501-1,000470 contacts →

Indirect evidence

“We free IT leaders to do what matters.”

Source: RevenueBase Database · checked Sep 29, 2026
13Partial evidenceRed Bank, NJ, United StatesHQ checked Sep 29, 20261,001-5,000416 contacts →

Partial evidence

“United Security Inc.(USI) provides personalized security solutions enhanced by advanced technology and cyber services.”

Source: RevenueBase Database · checked Sep 29, 2026
14Indirect evidenceJakarta, IndonesiaHQ checked Sep 29, 2026201-500388 contacts →

Indirect evidence

“ITSEC Asia is a leading cybersecurity company in Indonesia, listed on the Indonesian Stock Exchange (“CYBR”), with over 400 employees across five countries.”

Source: RevenueBase Database · checked Sep 29, 2026
15Indirect evidenceBochum, GermanyHQ checked Sep 29, 2026501-1,000386 contacts →

Indirect evidence

“Progress is our motivation because we are convinced that it will lead us to a successful future – independent of industries, companies and social classes.”

Source: RevenueBase Database · checked Sep 29, 2026
16Strong evidenceRiyadh, Saudi ArabiaHQ checked Sep 29, 2026201-500358 contacts →

Strong evidence

“National Company of Telecommunications and Information Security (NTIS) is a leading Saudi company in the field of research and development, production, support and…”

Source: RevenueBase Database · checked Sep 29, 2026
17Indirect evidenceLima, PeruHQ checked Sep 29, 2026201-500349 contacts →

Indirect evidence

“Somos la compañía del Grupo Telefónica pionera en seguridad tecnológica integral.”

Source: RevenueBase Database · checked Sep 29, 2026
18Indirect evidenceMiramar, FL, United StatesHQ checked Sep 29, 2026201-500345 contacts →

Indirect evidence

“Claro, a subsidiary of América Móvil, is a global integrator with over 20 years of experience and your partner for managing secure-by-design cybersecurity and information…”

Source: RevenueBase Database · checked Sep 29, 2026
19Partial evidenceDublin 12, IrelandHQ checked Sep 29, 2026201-500335 contacts →

Partial evidence

“We deliver fully managed security, networking, cloud and communications services designed to drive enterprise.”

Source: RevenueBase Database · checked Sep 29, 2026
20Partial evidenceSantiago, ChileHQ checked Sep 29, 2026201-500317 contacts →

Partial evidence

“Novared is a leading Security Services Provider founded in 1995.”

Source: RevenueBase Database · checked Sep 29, 2026
21Partial evidenceBellevue, WA, United StatesHQ checked Sep 29, 202651-200273 contacts →

Partial evidence

“Network Computing Architects, Inc.(NCA) is a rapidly growing, quality-driven technology provider of services and telecommunication products for businesses of all sizes.”

Source: RevenueBase Database · checked Sep 29, 2026
22Partial evidenceWettingen, SwitzerlandHQ checked Sep 29, 2026501-1,000269 contacts →

Partial evidence

“As a leading IT security enterprise, the SITS Group stands for end-to-end security.”

Source: RevenueBase Database · checked Sep 29, 2026
23Indirect evidenceUnited StatesHQ checked Sep 29, 2026501-1,000249 contacts →

Indirect evidence

“KATIM is a leader in the development of innovative secure communication products and solutions for governments and businesses.”

Source: RevenueBase Database · checked Sep 29, 2026
24Indirect evidenceSectorul 1, RomaniaHQ checked Sep 29, 2026201-500247 contacts →

Indirect evidence

“Since 2003, we have consulted and implemented complete solutions for any business.”

Source: RevenueBase Database · checked Sep 29, 2026
25Indirect evidenceCovina, CA, United StatesHQ checked Sep 29, 2026201-500239 contacts →

Indirect evidence

“CUJO AI® is the global leader of cutting-edge cybersecurity and network intelligence solutions that enable network operators globally to improve the digital life protection of…”

Source: RevenueBase Database · checked Sep 29, 2026

Showing 25 of 5,902 telecommunications security services worldwide

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Telecommunications security services worldwide at a glance

As of Sep 29, 2026
29.4%Verified-email coverage
15.4Average contacts per company
11-50Median size (employees)
1.3%Largest-city concentration · Sao Paulo
Sep 29, 2026Page data refreshed

Companies by employee count

1-10
2,865
11-50
2,139
51-200
601
201-500
143
501-1,000
55
1,001-5,000
41
5,001-10,000
8
10001+
8

Email recency is reported on each country list linked below.

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 telecommunications security services, 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.
Coverage
Every country. Country and city lists for telecommunications security services are linked below.
What qualifies
Companies worldwide whose own description of what they do matches “telecommunications security services”. 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 telecommunications security services), 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 telecommunications security services, and records with no verified work email.
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, 26,708 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 29, 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.

Telecommunications security services by location

30 lists · largest first

Every Telecommunications security services list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

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 telecommunications security services, 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 telecommunications security services are there worldwide?

RevenueBase identified 5,902 telecommunications security services worldwide 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?

Fortinet, headquartered in Sunnyvale, tops this list with the largest team on record.

Which country has the most telecommunications security services?

The United States leads with 1,012 companies, followed by Brazil (447) and India (272). Every telecommunications security services list by country and city is linked on this page.

Which city has the most telecommunications security services?

Sao Paulo leads with 77 headquartered companies, followed by London (61) and Rio De Janeiro (46).

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 26,708 verified decision-maker contacts tracked across these 5,902 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 29, 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.