Company lists · Data refreshed September 2026

Top 24 Business cybersecurity services based in San Francisco, United States

Name: Business cybersecurity 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 Sep 21, 2026 62 companies tracked

RevenueBase identified 62 business cybersecurity services headquartered in San Francisco, United States as of September 2026 and tracks 616 professional contacts across them, including 359 with verified work emails. New York is the largest hub.

This list covers business cybersecurity services headquartered in San Francisco, United States, 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 21, 2026.

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 21, 2026 86% judged on-target in blind review

62Companies

616Contacts tracked

359Verified emails

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The 24 largest business cybersecurity services based in San Francisco, United States

Ranked by team size

Top 24 of 62 business cybersecurity services based in San Francisco, United States, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to business cybersecurity 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.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Nozomi Networks	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 21, 2026	201-500	375 contacts →
	Indirect evidence “We protect the world’s critical infrastructure from cyber threats.” Source: RevenueBase Database · checked Sep 21, 2026
2	Seworks	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 21, 2026	11-50	27 contacts →
	Indirect evidence “We specialize in Web Application and API penetration Testing, Cyber Threat Intelligence, and Detecting Account Takeovers (ATOs) from attackers.” Source: RevenueBase Database · checked Sep 21, 2026
3	Sentant	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 21, 2026	11-50	24 contacts →
	Strong evidence “Sentant is a next-generation cybersecurity & IT services firm with a team of experienced technology professionals.” Source: RevenueBase Database · checked Sep 21, 2026
4	Centarus	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 21, 2026	11-50	22 contacts →
	Strong evidence “Centarus is dedicated to providing dependable Managed IT & Cybersecurity support to firms that want to increase efficiency & stay secure.” Source: RevenueBase Database · checked Sep 21, 2026
5	Ysecurity	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 21, 2026	11-50	14 contacts →
	Strong evidence “We are a team of cybersecurity operators from Silicon Valley.” Source: RevenueBase Database · checked Sep 21, 2026
6	Securisea	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 21, 2026	11-50	10 contacts →
	Indirect evidence “At Securisea, we are trusted and proven experts in compliance and security.” Source: RevenueBase Database · checked Sep 21, 2026
7	Humanize, INC	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 21, 2026	11-50	6 contacts →
	Strong evidence “Humanize is an innovative and data-conscious company that transforms cybersecurity weaknesses to human readable quantified risks for C-Suite.” Source: RevenueBase Database · checked Sep 21, 2026
8	Startup Defense	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 21, 2026	11-50	5 contacts →
	Strong evidence “Enterprise Cybersecurity Made Simple” Source: RevenueBase Database · checked Sep 21, 2026
9	909cyber	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 21, 2026	1-10	5 contacts →
	Indirect evidence “Fraud doesn’t break in.” Source: RevenueBase Database · checked Sep 21, 2026
10	Dogpatch Solutions INC	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 21, 2026	1-10	4 contacts →
	Strong evidence “Dogpatch Solutions is a leading IT consulting firm that specializes in cybersecurity assessments, migrations, networking and cloud computing solutions.” Source: RevenueBase Database · checked Sep 21, 2026
11	BH Tech Connection, LLC	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 21, 2026	1-10	4 contacts →
	Indirect evidence “We protect small businesses and individuals from ransomware, data loss, and other threats, starting from a dollar a day.” Source: RevenueBase Database · checked Sep 21, 2026
12	Usdn INC	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 21, 2026	11-50	4 contacts →
	Indirect evidence “Security Operations Center • Litigation Support • Forensic Lab Email: usdnlab@usdn.net Global Toll Free: 866.930.4312 Non-Emergency: PGP Key: usdnlab@usdn.net -BEGIN PGP PUBLIC…” Source: RevenueBase Database · checked Sep 21, 2026
13	Xivx Risk & Threat Intelligence	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 21, 2026	1-10	4 contacts →
	Strong evidence “At XIVX Risk & Threat Intelligence, we help groups minimize risk, understand threats, and achieve compliance the right way: through functional and effective cybersecurity.” Source: RevenueBase Database · checked Sep 21, 2026
14	Tekleap	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 21, 2026	11-50	3 contacts →
	Indirect evidence “With over two decades of experience in sensitive data management across hundreds of clients and installations, we at TekLeap understand the inherent weaknesses and threats in…” Source: RevenueBase Database · checked Sep 21, 2026
15	Servadus	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 21, 2026	1-10	3 contacts →
	Strong evidence “Cybersecurity by Design, we help organizations with their cybersecurity and compliance programs through management and sustainability, consulting, and assessing.” Source: RevenueBase Database · checked Sep 21, 2026
16	Securenexa	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 21, 2026	1-10	3 contacts →
	Strong evidence “SecureNexa is a global cybersecurity partner for small and mid-sized businesses.” Source: RevenueBase Database · checked Sep 21, 2026
17	Socialproof Security	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 21, 2026	1-10	2 contacts →
	Indirect evidence “Defend against cyber criminals with engaging security awareness and social engineering prevention videos, training, talks and penetration testing.” Source: RevenueBase Database · checked Sep 21, 2026
18	Cobaltix Compliance	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 21, 2026	1-10	2 contacts →
	Indirect evidence “Cobaltix Compliance provides risk assessments, creates policies and procedures, conducts vulnerability assessments and penetration testing, and performs vendor due diligence…” Source: RevenueBase Database · checked Sep 21, 2026
19	Rubica, INC	Indirect evidence	San Francisco, United StatesHQ checked Sep 21, 2026	11-50	1 contacts →
	Indirect evidence “Rubica exists to protect the "digital rights” of individuals and to empower people to take control of their security and privacy – and ultimately reduce the incidence of…” Source: RevenueBase Database · checked Sep 21, 2026
20	Fusion Security Solutions INC	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 21, 2026	1-10	1 contacts →
	Indirect evidence “Fusion Security Solutions provides expert knowledge and methods, while delivering effective, efficient, and consistent security and managed services solutions for your business.” Source: RevenueBase Database · checked Sep 21, 2026
21	Badgereyesecurity	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 21, 2026	1-10	1 contacts →
	Indirect evidence “We are mainly focused on providing managed security services as well as consultancy on security architecture.” Source: RevenueBase Database · checked Sep 21, 2026
22	D3 Networks	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 21, 2026	1-10	1 contacts →
	Strong evidence “D3 Networks specializes in meeting the information technology and cybersecurity needs of firms in the financial industry.” Source: RevenueBase Database · checked Sep 21, 2026
23	Securityinfinity	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 21, 2026	1-10	1 contacts →
	Indirect evidence “Secure your website in 10 minutes.” Source: RevenueBase Database · checked Sep 21, 2026
24	Posturity	Strong evidence	San Francisco, United StatesHQ checked Sep 21, 2026	1-10	1 contacts →
	Strong evidence “Posturity’s managed cybersecurity technology governance service optimizes the spend, protection, compliance, and manageability of your stack.” Source: RevenueBase Database · checked Sep 21, 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: business cybersecurity services. 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 business cybersecurity services.
Partial evidence: Its own public description names part of business cybersecurity services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name business cybersecurity services. 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 24 of 62 business cybersecurity services based in San Francisco, United States

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Business cybersecurity services based in San Francisco, United States at a glance

As of Sep 21, 2026

58.3%Verified-email coverage

9.9Average contacts per company

1-10Median size (employees)

274.2%Largest-city concentration · New York

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

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 62 companies.

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 business cybersecurity 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.
What qualifies: Companies headquartered in San Francisco, United States whose own description of what they do matches “business cybersecurity 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 business cybersecurity 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 business cybersecurity services, and records with no verified work email. Companies headquartered outside San Francisco are excluded even when they keep an office there.
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, 359 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 21, 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.

Business cybersecurity services by metro in the United States

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 business cybersecurity 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 business cybersecurity services are there based in San Francisco, United States?

RevenueBase identified 62 business cybersecurity services headquartered in San Francisco, United States 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?

Nozomi Networks, headquartered in San Francisco, tops this list with the largest team on record.

Which city has the most business cybersecurity services?

New York leads with 170 headquartered companies, followed by Atlanta (101) and Houston (100).

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 359 verified decision-maker contacts tracked across these 62 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 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 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.