Company lists · Data refreshed September 2026

Top 25 Telecommunications cybersecurity firms worldwide

Name: Telecommunications cybersecurity firms worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 12,085 companies tracked

RevenueBase identified 12,085 telecommunications cybersecurity firms worldwide as of September 2026 and tracks 218,226 professional contacts across them, including 74,520 with verified work emails. The United States is the largest market and London the largest hub.

This list covers telecommunications cybersecurity firms 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 cybersecurity firms 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

12,085Companies

218,226Contacts tracked

74,520Verified emails

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The 25 largest telecommunications cybersecurity firms worldwide

Ranked by team size

Top 25 of 12,085 telecommunications cybersecurity firms worldwide, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to telecommunications cybersecurity firms: 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	Palo Alto Networks	Partial evidence	Santa Clara, CA, United StatesHQ checked Sep 29, 2026	10001+	18,431 contacts →
	Partial evidence “Palo Alto Networks, the global cybersecurity leader, is shaping the cloud-centric future with technology that is transforming the way people and organizations operate.” Source: RevenueBase Database · checked Sep 29, 2026
2	Fortinet	Indirect evidence	Sunnyvale, CA, United StatesHQ checked Sep 29, 2026	10001+	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
3	Symantec	Partial evidence	San Jose, CA, United StatesHQ checked Sep 29, 2026	10001+	11,169 contacts →
	Partial evidence “Your backstage pass to the most epic cybersecurity solutions on the market for Endpoint, Network, Data and Cloud security.” Source: RevenueBase Database · checked Sep 29, 2026
4	Sophos	Partial evidence	Abingdon, United KingdomHQ checked Sep 29, 2026	5,001-10,000	4,925 contacts →
	Partial evidence “Sophos is a cybersecurity leader defending organizations globally with an AI-driven platform and expert-led services.” Source: RevenueBase Database · checked Sep 29, 2026
5	Orange Cyberdefense	Partial evidence	Nanterre, FranceHQ checked Sep 29, 2026	1,001-5,000	3,673 contacts →
	Partial evidence “Orange Cyberdefense is the expert cybersecurity business unit of the Orange Group.” Source: RevenueBase Database · checked Sep 29, 2026
6	Trellix	Partial evidence	Plano, TX, United StatesHQ checked Sep 29, 2026	1,001-5,000	3,447 contacts →
	Partial evidence “Trellix is a global cybersecurity company delivering intelligence-led cyber resilience for security-conscious organizations at any stage of their journey.” Source: RevenueBase Database · checked Sep 29, 2026
7	Alcatel-Lucent Enterprise	Indirect evidence	92707 Colombes, GermanyHQ checked Sep 29, 2026	1,001-5,000	2,811 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
8	Bitdefender	Partial evidence	Bucuresti, RomaniaHQ checked Sep 29, 2026	1,001-5,000	2,172 contacts →
	Partial evidence “Bitdefender is a cybersecurity leader delivering best-in-class threat prevention, detection, and response solutions worldwide.” Source: RevenueBase Database · checked Sep 29, 2026
9	Quick Heal	Indirect evidence	Pune, IndiaHQ checked Sep 29, 2026	1,001-5,000	1,510 contacts →
	Indirect evidence “Quick Heal Technologies Limited is one of the leading providers of IT Security and Data Protection Solutions with a strong footprint in India and an evolving global presence.” Source: RevenueBase Database · checked Sep 29, 2026
10	Thales Cybersecurity Products	Partial evidence	Austin, TX, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,252 contacts →
	Partial evidence “Thales is a global leader in cybersecurity, helping the most trusted organizations in the world protect their most critical applications, data, and identities anywhere at scale.” Source: RevenueBase Database · checked Sep 29, 2026
11	Guidepoint Security	Partial evidence	Reston, VA, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,232 contacts →
	Partial evidence “GuidePoint Security provides trusted cybersecurity expertise, solutions, and services that help organizations make informed decisions and minimize risk.” Source: RevenueBase Database · checked Sep 29, 2026
12	Imperva	Indirect evidence	Austin, TX, United StatesHQ checked Sep 29, 2026	10001+	1,217 contacts →
	Indirect evidence “On Dec.” Source: RevenueBase Database · checked Sep 29, 2026
13	Irdeto	Partial evidence	Hoofddorp, NetherlandsHQ checked Sep 29, 2026	1,001-5,000	1,026 contacts →
	Partial 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
14	Puntonet S.A	Indirect evidence	Quito, EcuadorHQ checked Sep 29, 2026	1,001-5,000	882 contacts →
	Indirect evidence “Puntonet, una de las empresas líderes en telecomunicaciones y con mayor crecimiento en Ecuador, cuenta con una sólida infraestructura, procesos seguros y un alto sentido humano.” Source: RevenueBase Database · checked Sep 29, 2026
15	Trustwave, A Levelblue Company	Partial evidence	Chicago, IL, United StatesHQ checked Sep 29, 2026	501-1,000	874 contacts →
	Partial evidence “Trustwave, a LevelBlue Company, is a globally recognized cybersecurity leader that reduces cyber risk and fortifies organizations against disruptive and damaging cyber threats.” Source: RevenueBase Database · checked Sep 29, 2026
16	ALLOT	Partial evidence	Hod-hasharon, IsraelHQ checked Sep 29, 2026	501-1,000	856 contacts →
	Partial 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
17	Application Specialist Kompany ASK	Indirect evidence	Lansing, MI, United StatesHQ checked Sep 29, 2026	n/a	785 contacts →
	Indirect evidence “ASK is now Convergence Networks!” Source: RevenueBase Database · checked Sep 29, 2026
18	SISA	Partial evidence	Bengaluru, IndiaHQ checked Sep 29, 2026	201-500	743 contacts →
	Partial evidence “SISA is a global forensics-driven cybersecurity solutions company, trusted by leading organizations for securing their businesses with robust preventive, detective, and corrective…” Source: RevenueBase Database · checked Sep 29, 2026
19	S2grupo	Partial evidence	Valencia, SpainHQ checked Sep 29, 2026	501-1,000	683 contacts →
	Partial evidence “We are a European company specialising in cybersecurity, cyberintelligence and cyberdefence, with more than 20 years of experience protecting critical infrastructures and…” Source: RevenueBase Database · checked Sep 29, 2026
20	I-Tracing	Partial evidence	Courbevoie, FranceHQ checked Sep 29, 2026	1,001-5,000	639 contacts →
	Partial evidence “I-TRACING, pure player and cybersecurity service provider leader in France, supports over 600 clients around the world in managing their cyber risks, from anticipating threats to…” Source: RevenueBase Database · checked Sep 29, 2026
21	Enea AB	Partial evidence	Stockholm, SwedenHQ checked Sep 29, 2026	501-1,000	638 contacts →
	Partial 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
22	Everfox	Indirect evidence	Herndon, United StatesHQ checked Sep 29, 2026	1,001-5,000	636 contacts →
	Indirect evidence “Everfox delivers trusted connectivity to protect the world's most critical environments, safeguarding the sensitive information behind decision advantage.” Source: RevenueBase Database · checked Sep 29, 2026
23	Help Ag, An E& Enterprise Company	Partial evidence	Dubai, United Arab EmiratesHQ checked Sep 29, 2026	501-1,000	634 contacts →
	Partial evidence “Help AG, the cybersecurity arm of e & company, provides leading enterprise businesses and governments across the Middle East with strategic consultancy combined with tailored…” Source: RevenueBase Database · checked Sep 29, 2026
24	Telos Corporation	Indirect evidence	Ashburn, VA, United StatesHQ checked Sep 29, 2026	501-1,000	629 contacts →
	Indirect evidence “Telos Corporation (NASDAQ: TLS) empowers and protects the world’s most security-conscious organizations with efficient, adaptable, and secure solutions that safeguard people…” Source: RevenueBase Database · checked Sep 29, 2026
25	Secunet Security Networks AG	Indirect evidence	Essen, GermanyHQ checked Sep 29, 2026	1,001-5,000	623 contacts →
	Indirect evidence “secunet – We are the Guardians of Europe's Digital Freedom.” Source: RevenueBase Database · checked Sep 29, 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: telecommunications cybersecurity firms. 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 telecommunications cybersecurity firms.
Partial evidence: Its own public description names part of telecommunications cybersecurity firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name telecommunications cybersecurity firms. 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 12,085 telecommunications cybersecurity firms worldwide

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Telecommunications cybersecurity firms worldwide at a glance

As of Sep 29, 2026

34.1%Verified-email coverage

18.1Average contacts per company

1-10Median size (employees)

2.2%Largest-city concentration · London

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

6,429

11-50

4,130

51-200

1,068

201-500

260

501-1,000

1,001-5,000

5,001-10,000

10001+

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 cybersecurity firms, 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 cybersecurity firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “telecommunications cybersecurity firms”. 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 cybersecurity firms), 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 cybersecurity firms, 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, 74,520 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 cybersecurity firms by location

91 lists · largest first

Every Telecommunications cybersecurity firms 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 cybersecurity firms, 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 cybersecurity firms are there worldwide?

RevenueBase identified 12,085 telecommunications cybersecurity firms 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?

Palo Alto Networks, headquartered in Santa Clara, tops this list with the largest team on record.

Which country has the most telecommunications cybersecurity firms?

The United States leads with 2,600 companies, followed by India (1,004) and the United Kingdom (694). Every telecommunications cybersecurity firms list by country and city is linked on this page.

Which city has the most telecommunications cybersecurity firms?

London leads with 260 headquartered companies, followed by Sao Paulo (133) and Dubai (127).

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 74,520 verified decision-maker contacts tracked across these 12,085 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.