Company lists · Data refreshed November 2026

Top 22 Enterprise security services based in San Francisco, United States

Name: Enterprise security services based in San Francisco, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Nov 5, 2026 63 companies tracked

RevenueBase identified 63 company matches for enterprise security services associated with San Francisco, United States as of November 2026 and tracks 772 professional contacts across them, including 156 with verified work emails. Across the United States, New York is the largest hub for this category (232 companies); San Francisco has 63.

This list covers company matches for enterprise security services associated with San Francisco, 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 November 5, 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 Nov 5, 2026 How this list was built

63Companies

772Contacts tracked

156Verified emails

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The 22 largest enterprise security services based in San Francisco, United States

Ranked by team size

Top 22 of 63 company matches for enterprise security services based in San Francisco, United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Nov 5, 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	Jones IT	Exact match	San Francisco, CA, United StatesHQ recorded Nov 5, 2026	51-200	92 contacts →
	Exact match “At Jones IT, we believe IT should make your life easier- not more complicated.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
2	Steele CSS	Exact match	San Francisco, CA, United StatesHQ recorded Nov 5, 2026	201-500	68 contacts →
	Exact match “STEELE Corporate Security Services is a global risk management firm that provides executive security, workplace stability, incident management, 24/ crisis response & GPS…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
3	Monarch	Exact match	San Francisco, CA, United StatesHQ recorded Nov 5, 2026	11-50	62 contacts →
	Exact match “At Monarch, we help organizations create safer, smarter environments through cutting-edge security technology.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
4	Global Secure 3	Exact match	San Francisco, CA, United StatesHQ recorded Nov 5, 2026	51-200	37 contacts →
	Exact match “Global Secure 3 (GS3) is an international firm that provides risk management and investigation services to corporate and public sector organizations.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
5	Rescor Group	Exact match	San Francisco, CA, United StatesHQ recorded Nov 5, 2026	51-200	34 contacts →
	Exact match “Rescor Group is a veteran-owned, Bay Area-based boutique security firm specializing in full-scope concierge executive protection.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
6	Bannerman Security	Exact match	San Francisco, CA, United StatesHQ recorded Nov 5, 2026	201-500	32 contacts →
	Exact match “Everyone deserves to feel safe.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
7	Treeline Security	Exact match	San Francisco, CA, United StatesHQ recorded Nov 5, 2026	51-200	31 contacts →
	Exact match “Treeline Security combines the personal touch of a small, client-focused team, with the extensive reach and resources of a large network.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
8	Sentant	Exact match	San Francisco, CA, United StatesHQ recorded Nov 5, 2026	11-50	26 contacts →
	Exact match “Sentant is a next-generation cybersecurity & IT services firm with a team of experienced technology professionals.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
9	Microbiz Security Company	Exact match	San Francisco, CA, United StatesHQ recorded Nov 5, 2026	11-50	17 contacts →
	Exact match “We specialize in the Design, Installation, and Service of access control, intrusion detection, video surveillance, alarm monitoring, building management software, internet of…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
10	909cyber	Exact match	San Francisco, CA, United StatesHQ recorded Nov 5, 2026	1-10	9 contacts →
	Exact match “Fraud doesn’t break in.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
11	Critical Synthesis Security	Exact match	San Francisco, CA, United StatesHQ recorded Nov 5, 2026	1-10	9 contacts →
	Exact match “The fundamental goal of CSS is to be an outstanding security organization dedicated to serving the Clients of CSS and the Public’s Safety, through its Officers, with effectiveness…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
12	ZAUN	Exact match	San Francisco, CA, United StatesHQ recorded Nov 5, 2026	11-50	7 contacts →
	Exact match “AI is spreading uncontrollably across your organization.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
13	Humanize, INC	Exact match	San Francisco, CA, United StatesHQ recorded Nov 5, 2026	11-50	6 contacts →
	Exact match “Humanize is an innovative and data-conscious company that transforms cybersecurity weaknesses to human readable quantified risks for C-Suite.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
14	Startup Defense	Exact match	San Francisco, CA, United StatesHQ recorded Nov 5, 2026	11-50	5 contacts →
	Exact match “Enterprise Cybersecurity Made Simple” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
15	Itasc Solutions	Exact match	San Francisco, CA, United StatesHQ recorded Nov 5, 2026	11-50	3 contacts →
	Exact match “Our core values are to strive for excellence, act with integrity, and bring the best results to your business.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
16	Tether Security	Exact match	San Francisco, CA, United StatesHQ recorded Nov 5, 2026	11-50	2 contacts →
	Exact match “Founded in 2005 as EXO5, Tether provides computer tracking and lockdown services for enterprise customers.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
17	Pacific Resilience Group	Exact match	San Francisco, CA, United StatesHQ recorded Nov 5, 2026	1-10	2 contacts →
	Exact match “Leveraging decades of experience in public and private sector security management, Pacific Resilience Group delivers industry-leading expertise in insider risk, workplace violence…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
18	Securecrowd	Exact match	San Francisco, CA, United StatesHQ recorded Nov 5, 2026	1-10	1 contacts →
	Exact match “SecureCrowd is a global managed cybersecurity service provider dedicated to protecting businesses from digital threats.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
19	Fusion Security Solutions INC	Exact match	San Francisco, CA, United StatesHQ recorded Nov 5, 2026	1-10	1 contacts →
	Exact match “Fusion Security Solutions provides expert knowledge and methods, while delivering effective, efficient, and consistent security and managed services solutions for your business.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
20	D3 Networks	Exact match	San Francisco, CA, United StatesHQ recorded Nov 5, 2026	1-10	1 contacts →
	Exact match “D3 Networks specializes in meeting the information technology and cybersecurity needs of firms in the financial industry.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
21	Emerose Advisory Services	Exact match	San Francisco, CA, United StatesHQ recorded Nov 5, 2026	1-10	1 contacts →
	Exact match “Emerose is an independent consulting practice providing security consulting services to enterprise and startup customers alike.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
22	EMX Insight	Exact match	San Francisco, CA, United StatesHQ recorded Nov 5, 2026	1-10	1 contacts →
	Exact match “Professional services consulting in enterprise network security, collaboration, AI, application development, and IT training across multiple industries and government sectors.” Recorded in the RevenueBase company graph · Nov 5, 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 “enterprise security 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 22 of 63 enterprise security services based in San Francisco, United States

See the full list, filter by size, metro and specialty, and access 156 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Enterprise security services based in San Francisco, United States at a glance

As of Nov 5, 2026

20.2%Verified-email coverage

12.3Average contacts per company

11-50Median size (employees)

Nov 5, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

1,001-5,000

Email recency for this list is measured across the whole United States list rather than for San Francisco, so it is reported there. Company counts and contact totals on this page are exact for San Francisco, over 63 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 Francisco, United States whose business descriptions match “enterprise security 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. 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 156 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 5, 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.

Enterprise security services 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 “enterprise security services”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many enterprise security services are there based in San Francisco, United States?

RevenueBase identified 63 company matches for enterprise security services associated with San Francisco, United States 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?

Jones IT 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 enterprise security services?

New York leads the United States with 232 company records, followed by Houston (184) and Los Angeles (143). San Francisco has 63.

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 156 professional contacts with verified work emails tracked across these 63 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 5, 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.