Company lists · Data refreshed September 2026

Top 18 Managed cybersecurity companies based in San Jose, United States

Name: Managed cybersecurity companies based in San Jose, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 34 companies tracked

RevenueBase identified 34 company matches for managed cybersecurity companies associated with San Jose, United States as of September 2026 and tracks 14,198 professional contacts across them, including 2,661 with verified work emails. Across the United States, New York is the largest hub for this category (199 companies); San Jose has 34.

This list covers company matches for managed cybersecurity companies associated with San Jose, United States, 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 September 21, 2026.

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 Sep 21, 2026 How this list was built

34Companies

14,198Contacts tracked

2,661Verified emails

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The 18 largest managed cybersecurity companies based in San Jose, United States

Ranked by team size

Top 18 of 34 company matches for managed cybersecurity companies based in San Jose, United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 21, 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	Symantec	Exact match	San Jose, CA, United StatesHQ recorded Sep 21, 2026	10001+	11,169 contacts →
	Exact match “Your backstage pass to the most epic cybersecurity solutions on the market for Endpoint, Network, Data and Cloud security.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
2	Forescout Technologies INC	Exact match	San Jose, CA, United StatesHQ recorded Sep 21, 2026	1,001-5,000	1,181 contacts →
	Exact match “As AI-driven vulnerability and exploitation accelerate attack velocity to machine speed, Forescout is a foundational cyber defense layer that allows organizations to segment and…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
3	Netenrich	Exact match	San Jose, CA, United StatesHQ recorded Sep 21, 2026	501-1,000	889 contacts →
	Exact match “Netenrich is redefining security operations by shifting the focus from "efficiency"(speed) to "efficacy"(comprehensive coverage).” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
4	Vectra AI	Exact match	San Jose, CA, United StatesHQ recorded Sep 21, 2026	501-1,000	651 contacts →
	Exact match “Vectra AI is the cybersecurity AI leader in protecting modern networks from modern attacks.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
5	Secqureone	Exact match	San Jose, CA, United StatesHQ recorded Sep 21, 2026	51-200	43 contacts →
	Exact match “SecqureOne (SQ1) is a Silicon Valley based end-to-end cyber security and compliance solution provider serving businesses globally over the last 17 years.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
6	Truadvantage	Exact match	San Jose, CA, United StatesHQ recorded Sep 21, 2026	11-50	34 contacts →
	Exact match “TruAdvantage is a Bay Area-based, award-winning IT firm that specializes in managed IT, managed Cybersecurity, managed Compliance and Cloud solutions.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
7	Firewalla INC	Exact match	San Jose, CA, United StatesHQ recorded Sep 21, 2026	11-50	23 contacts →
	Exact match “Firewalla is dedicated to making accessible cybersecurity solutions that are simple, affordable, and powerful.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
8	Reblaze Part Of Link11	Exact match	San Jose, CA, United StatesHQ recorded Sep 21, 2026	51-200	19 contacts →
	Exact match “Link11 and Reblaze have united to provide comprehensive, enterprise-grade cybersecurity solutions, making the Internet safer for businesses of all sizes.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
9	Genians	Exact match	San Jose, CA, United StatesHQ recorded Sep 21, 2026	51-200	12 contacts →
	Exact match “Genians delivers measurable cybersecurity through NAC, EDR, and Universal ZTNA, turning visibility into verified trust and compliance.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
10	ITQUE	Exact match	San Jose, CA, United StatesHQ recorded Sep 21, 2026	11-50	11 contacts →
	Exact match “ITque is a leading Managed IT Security & Services Provider specializing in network and data security.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
11	Cygne Noir Cyber	Exact match	San Jose, CA, United StatesHQ recorded Sep 21, 2026	11-50	11 contacts →
	Exact match “At Cygne Noir Cyber, we believe that security and intelligence go hand in hand.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
12	Cloud 1 Solutions, INC	Exact match	San Jose, CA, United StatesHQ recorded Sep 21, 2026	51-200	10 contacts →
	Exact match “Cloud 1 Solutions provides Managed IT and Security Services for your organization.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
13	Esudo Technology Solutions	Exact match	San Jose, CA, United StatesHQ recorded Sep 21, 2026	1-10	7 contacts →
	Exact match “Businesses of every size, in every industry, are increasingly dependent on technology.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
14	Securenomics	Exact match	San Jose, CA, United StatesHQ recorded Sep 21, 2026	11-50	5 contacts →
	Exact match “Securenomics is a distributor of Netskope, Cisco Security, Cato Networks and Cyberhaven Security services, empowering channel partners to offer customers the security they need to…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
15	Guarded Cyber	Exact match	San Jose, CA, United StatesHQ recorded Sep 21, 2026	1-10	5 contacts →
	Exact match “Guarded Cyber is a Veteran Owned Managed Cybersecurity Services Provider that offers more than just technical expertise; we provide peace of mind.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
16	Infoguard Cyber Security	Exact match	San Jose, CA, United StatesHQ recorded Sep 21, 2026	11-50	4 contacts →
	Exact match “WHAT WE DO We Provide a Comprehensive CYBER SECURITY SOLUTIONS AND CONSULTING SERVICES that Protect organizations information assets against a range of cyber threats & Mitigate…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
17	Cyber Gardener	Exact match	San Jose, CA, United StatesHQ recorded Sep 21, 2026	1-10	2 contacts →
	Exact match “We are a cybersecurity consulting company focused on CMMC, CYBER INSURANCE, and HIPAA assessment company.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
18	Doyengc-Apon	Exact match	San Jose, CA, United StatesHQ recorded Sep 21, 2026	1-10	2 contacts →
	Exact match “Digital Transformation is all about making Company competent enough so that it can en-cash all the digital Moments that come while doing Business.” Recorded in the RevenueBase company graph · Sep 21, 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 “managed cybersecurity companies”. 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 18 of 34 managed cybersecurity companies based in San Jose, United States

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Managed cybersecurity companies based in San Jose, United States at a glance

As of Sep 21, 2026

18.7%Verified-email coverage

417.6Average contacts per company

11-50Median size (employees)

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

10001+

Email recency for this list is measured across the whole United States list rather than for San Jose, so it is reported there. Company counts and contact totals on this page are exact for San Jose, over 34 companies.

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.
What qualifies: Company records associated with San Jose, United States whose business descriptions match “managed cybersecurity companies” 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. Where headquarters information is recorded, preview rows are also filtered to this page’s location. 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 2,661 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 September 21, 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.

Managed cybersecurity companies by metro in the United States

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 “managed cybersecurity companies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many managed cybersecurity companies are there based in San Jose, United States?

RevenueBase identified 34 company matches for managed cybersecurity companies associated with San Jose, United States as of September 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?

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

Which city in the United States has the most managed cybersecurity companies?

New York leads the United States with 199 company records, followed by Houston (117) and Miami (108). San Jose has 34.

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 2,661 professional contacts with verified work emails tracked across these 34 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 September 21, 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.