Company lists · Data refreshed November 2026

Top 25 Ciso services worldwide

Name: Ciso services worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Nov 6, 2026 55,292 companies tracked

RevenueBase identified 55,292 company matches for ciso services worldwide as of November 2026 and tracks 839,603 professional contacts across them, including 237,601 with verified work emails. The United States is the largest market and London the largest hub.

This list covers company matches for ciso services worldwide, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed November 6, 2026. Country and city lists for ciso services follow the table.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 SmartSearch · Exact Recorded Nov 6, 2026 How this list was built

55,292Companies

839,603Contacts tracked

237,601Verified emails

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The 25 largest ciso services worldwide

Ranked by team size

Top 25 of 55,292 company matches for ciso services worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Nov 6, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	DXC Technology	Exact match	Ashburn, VA, United StatesHQ recorded Nov 6, 2026	10001+	86,844 contacts →
	Exact match “DXC Technology helps global companies run their mission-critical systems and operations while modernizing IT, optimizing data architectures, and ensuring security and scalability…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
2	Private Sector	Exact match	United StatesHQ recorded Nov 6, 2026	n/a	13,149 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
3	ELM Company	Exact match	Riyadh, Saudi ArabiaHQ recorded Nov 6, 2026	1,001-5,000	7,577 contacts →
	Exact match “Elm is the leading provider of innovative secure services & solutions to both public and private sectors in Saudi Arabia.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
4	Sify Technologies Limited	Exact match	Chennai, IndiaHQ recorded Nov 6, 2026	1,001-5,000	7,202 contacts →
	Exact match “A Fortune India 500 company, Sify Technologies is India’s most comprehensive ICT service & solution provider.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
5	CMS IT Services	Exact match	Bangalore, IndiaHQ recorded Nov 6, 2026	5,001-10,000	4,449 contacts →
	Exact match “CMS IT is a leading India-focused, tier-1 preferred IT provider with a legacy of four decades.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
6	Automated Systems H.K. Limited	Exact match	Shatin, Hong KongHQ recorded Nov 6, 2026	1,001-5,000	4,273 contacts →
	Exact match “Established in 1973, ASL (HKEX: 771) accelerates the success of leading organizations by building a bridge connecting innovative technology to the business environment.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
7	NRI Group	Exact match	Chiyoda-ku, NY, JapanHQ recorded Nov 6, 2026	10001+	3,248 contacts →
	Exact match “We align our goals with our clients’ goals – a true partnership that ensures shared success.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
8	Grupo GR	Exact match	São Paulo, BrazilHQ recorded Nov 6, 2026	10001+	3,132 contacts →
	Exact match “Fundado em 1992, o GRUPO GR se consolidou no mercado por sua qualidade e seriedade na implantação e operação de soluções de segurança e serviços para diversos tipos de clientes.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
9	GTT	Exact match	Arlington, VA, United StatesHQ recorded Nov 6, 2026	1,001-5,000	3,071 contacts →
	Exact match “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 –…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
10	Mitra Integrasi Informatika, PT	Exact match	Jakarta, IndonesiaHQ recorded Nov 6, 2026	1,001-5,000	2,734 contacts →
	Exact match “Mitra Integrasi Informatika (“MII”), established in 1996 as a subsidiary of the publicly listed PT Metrodata Electronics, Tbk.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
11	NIL LTD	Exact match	Ljubljana, SloveniaHQ recorded Nov 6, 2026	n/a	2,639 contacts →
	Exact match “NIL is a globally recognized provider of advanced data center, network, cloud, cyber security solutions as well as services for business and industry environments, state…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
12	OPTIV	Exact match	Leawood, KS, United StatesHQ recorded Nov 6, 2026	1,001-5,000	2,171 contacts →
	Exact match “Optiv is the cyber advisory and solutions leader, delivering strategic and technical expertise to nearly companies across every major industry.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
13	Alten Spain	Exact match	Madrid, SpainHQ recorded Nov 6, 2026	1,001-5,000	2,106 contacts →
	Exact match “ALTEN es una multinacional europea especializada en proporcionar servicios de consultoría, tecnologías de la información y servicios de ingeniería a las principales compañías del…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
14	Eplus INC	Exact match	Herndon, VA, United StatesHQ recorded Nov 6, 2026	1,001-5,000	1,901 contacts →
	Exact match “ePlus is a customer-first, services-led, results-driven and trusted industry leader that helps organizations secure, modernize, optimize, and scale every aspect of their IT…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
15	Precision Infomatic M Private Limited	Exact match	Chennai, IndiaHQ recorded Nov 6, 2026	1,001-5,000	1,900 contacts →
	Exact match “Established in 1996, Precision provides IT Infrastructure Management Services, Biometric, IoT, Cloud and IT System Integration solutions.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
16	Inspira Enterprise	Exact match	Mumbai, IndiaHQ recorded Nov 6, 2026	1,001-5,000	1,859 contacts →
	Exact match “Inspira Enterprise is a global Cybersecurity & Data Analytics & AI services provider with a presence in North America, ASEAN, Middle East, India, and Africa regions.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
17	TAO Digital Solutions	Exact match	Santa Clara, CA, United StatesHQ recorded Nov 6, 2026	1,001-5,000	1,768 contacts →
	Exact match “TAO Digital Solutions empowers businesses to excel with innovative technological capabilities and forward-thinking strategies.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
18	Writer Information	Exact match	Mumbai, IndiaHQ recorded Nov 6, 2026	5,001-10,000	1,720 contacts →
	Exact match “Writer Information, a business division of Writer Corporation is a premier information solutions and services provider.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
19	CMS	Exact match	Meudon La Foret, FranceHQ recorded Nov 6, 2026	n/a	1,569 contacts →
	Exact match “Société d'infogérance” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
20	Site سايت	Exact match	Al Nakheel, Saudi ArabiaHQ recorded Nov 6, 2026	501-1,000	1,514 contacts →
	Exact match “We are established for enriching local content in designing, developing, and operating secure digital computing environments through Saudi talents, by fulfilling our role as a…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
21	AEVEN	Exact match	Ballerup, DenmarkHQ recorded Nov 6, 2026	1,001-5,000	1,482 contacts →
	Exact match “We’re here to provide digital infrastructure that helps companies and institutions steer a straight course.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
22	Trace3	Exact match	Irvine, MI, United StatesHQ recorded Nov 6, 2026	1,001-5,000	1,431 contacts →
	Exact match “Trace3 delivers business transformation.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
23	SCC France	Exact match	Nanterre, FranceHQ recorded Nov 6, 2026	1,001-5,000	1,414 contacts →
	Exact match “SCC France unleashes the potential of IT for global businesses, as one of Europe’s largest independent IT groups.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
24	Thales Cybersecurity Products	Exact match	Austin, TX, United StatesHQ recorded Nov 6, 2026	1,001-5,000	1,413 contacts →
	Exact match “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.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
25	SMX	Exact match	Hollywood, MA, United StatesHQ recorded Nov 6, 2026	1,001-5,000	1,402 contacts →
	Exact match “SMX is a global technology and advanced engineering provider specializing in Cloud Solutions, C5ISR, and Advanced Engineering / IT.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “ciso services”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 55,292 ciso services worldwide

See the full list, filter by size, metro and specialty, and access 237,601 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Ciso services worldwide at a glance

As of Nov 6, 2026

28.3%Verified-email coverage

15.2Average contacts per company

1-10Median size (employees)

1.8%Largest-city concentration · London

Nov 6, 2026Page data refreshed

Companies by employee count

1-10

31,266

11-50

17,471

51-200

4,491

201-500

983

501-1,000

333

1,001-5,000

275

5,001-10,000

10001+

Email recency is reported on each country list linked below.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
Coverage: Every country. Country and city lists for ciso services are linked below.
What qualifies: Company records worldwide whose business descriptions match “ciso services” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 237,601 professional contacts with verified work emails across the full matched dataset. 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 November 6, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Ciso services by location

315 lists · largest first

Every Ciso 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 SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “ciso services”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many ciso services are there worldwide?

RevenueBase identified 55,292 company matches for ciso services worldwide as of November 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

DXC Technology tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which country has the most ciso services?

The United States leads with 12,146 companies, followed by India (3,645) and the United Kingdom (3,097). Every ciso services list by country and city is linked on this page.

Which city has the most ciso services?

London leads with 975 company records, followed by Sao Paulo (663) and Paris (455).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 237,601 professional contacts with verified work emails tracked across these 55,292 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on November 6, 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 SmartSearch, 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.