Company lists · Data refreshed September 2026

Top 25 Professional cybersecurity services based in San Francisco, United States

Name: Professional 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 95 companies tracked

RevenueBase identified 95 company matches for professional cybersecurity services associated with San Francisco, United States as of September 2026 and tracks 4,955 professional contacts across them, including 874 with verified work emails. Across the United States, New York is the largest hub for this category (208 companies); San Francisco has 95.

This list covers company matches for professional cybersecurity 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 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

95Companies

4,955Contacts tracked

874Verified emails

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The 25 largest professional cybersecurity services based in San Francisco, United States

Ranked by team size

Top 25 of 95 company matches for professional cybersecurity services based in San Francisco, 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	Bugcrowd	Exact match	San Francisco, CA, United StatesHQ recorded Sep 21, 2026	n/a	3,649 contacts →
	Exact match “We are a crowdsourced security company that safeguards organizations' assets from sophisticated threat actors before they can strike-by uniting our customers with trusted hackers…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
2	Nozomi Networks	Exact match	San Francisco, CA, United StatesHQ recorded Sep 21, 2026	201-500	375 contacts →
	Exact match “We protect the world’s critical infrastructure from cyber threats.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
3	Cobalt	Exact match	San Francisco, CA, United StatesHQ recorded Sep 21, 2026	201-500	350 contacts →
	Exact match “Cobalt is the pioneer in pentesting as a service and a leader in offensive security services.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
4	Jones IT	Exact match	San Francisco, CA, United StatesHQ recorded Sep 21, 2026	51-200	82 contacts →
	Exact match “At Jones IT, we believe IT should make your life easier- not more complicated.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
5	Practical Devsecops	Exact match	San Francisco, CA, United StatesHQ recorded Sep 21, 2026	11-50	40 contacts →
	Exact match “Practical DevSecOps is a global cybersecurity education company specializing in hands-on DevSecOps, AI Security, and Application Security training and certifications.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
6	PCS Technology	Exact match	San Francisco, CA, United StatesHQ recorded Sep 21, 2026	11-50	36 contacts →
	Exact match “At PCS Technology, we know how important it is for nonprofits to trust that their systems are secure and well-managed.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
7	Dataway	Exact match	San Francisco, CA, United StatesHQ recorded Sep 21, 2026	11-50	28 contacts →
	Exact match “Dataway, Inc.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
8	Seworks	Exact match	San Francisco, CA, United StatesHQ recorded Sep 21, 2026	11-50	27 contacts →
	Exact match “We specialize in Web Application and API penetration Testing, Cyber Threat Intelligence, and Detecting Account Takeovers (ATOs) from attackers.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
9	Sentant	Exact match	San Francisco, CA, United StatesHQ recorded Sep 21, 2026	11-50	24 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 · Sep 21, 2026 · View company records in RevenueBase
10	Centarus	Exact match	San Francisco, CA, United StatesHQ recorded Sep 21, 2026	11-50	22 contacts →
	Exact match “Centarus is dedicated to providing dependable Managed IT & Cybersecurity support to firms that want to increase efficiency & stay secure.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
11	Code RED Partners	Exact match	San Francisco, CA, United StatesHQ recorded Sep 21, 2026	1-10	20 contacts →
	Exact match “Code Red specializes in cyber security staffing.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
12	Epiccyber	Exact match	San Francisco, CA, United StatesHQ recorded Sep 21, 2026	11-50	14 contacts →
	Exact match “EpicCyber: Empowering Your Business with Zscaler, Crowd strike, and Okta Cybersecurity Solutions” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
13	Ysecurity	Exact match	San Francisco, CA, United StatesHQ recorded Sep 21, 2026	11-50	14 contacts →
	Exact match “We are a team of cybersecurity operators from Silicon Valley.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
14	Securisea	Exact match	San Francisco, CA, United StatesHQ recorded Sep 21, 2026	11-50	10 contacts →
	Exact match “At Securisea, we are trusted and proven experts in compliance and security.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
15	Circle Security	Exact match	San Francisco, CA, United StatesHQ recorded Sep 21, 2026	1-10	9 contacts →
	Exact match “In the AI era, passwords and traditional MFA are no longer enough.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
16	Metabase Q	Exact match	San Francisco, United StatesHQ recorded Sep 21, 2026	51-200	9 contacts →
	Exact match “Metabase Q offers an end-to-end platform that enables businesses to manage, measure and mature their cybersecurity.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
17	Humanize, INC	Exact match	San Francisco, CA, United StatesHQ recorded Sep 21, 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 · Sep 21, 2026 · View company records in RevenueBase
18	Harmony Intelligence	Exact match	San Francisco, United StatesHQ recorded Sep 21, 2026	1-10	5 contacts →
	Exact match “We make it easy to catch critical vulnerabilities in your web app or API so you don't wake up to a bad breach.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
19	Startup Defense	Exact match	San Francisco, CA, United StatesHQ recorded Sep 21, 2026	11-50	5 contacts →
	Exact match “Enterprise Cybersecurity Made Simple” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
20	909cyber	Exact match	San Francisco, CA, United StatesHQ recorded Sep 21, 2026	1-10	5 contacts →
	Exact match “Fraud doesn’t break in.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
21	Dogpatch Solutions INC	Exact match	San Francisco, CA, United StatesHQ recorded Sep 21, 2026	1-10	4 contacts →
	Exact match “Dogpatch Solutions is a leading IT consulting firm that specializes in cybersecurity assessments, migrations, networking and cloud computing solutions.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
22	BH Tech Connection, LLC	Exact match	San Francisco, CA, United StatesHQ recorded Sep 21, 2026	1-10	4 contacts →
	Exact match “We protect small businesses and individuals from ransomware, data loss, and other threats, starting from a dollar a day.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
23	Usdn INC	Exact match	San Francisco, CA, United StatesHQ recorded Sep 21, 2026	11-50	4 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
24	Xivx Risk & Threat Intelligence	Exact match	San Francisco, CA, United StatesHQ recorded Sep 21, 2026	1-10	4 contacts →
	Exact match “At XIVX Risk & Threat Intelligence, we help groups minimize risk, understand threats, and achieve compliance the right way: through functional and effective cybersecurity.” Recorded in the RevenueBase company graph · Sep 21, 2026 · View company records in RevenueBase
25	Tekleap	Exact match	San Francisco, CA, United StatesHQ recorded Sep 21, 2026	11-50	3 contacts →
	Exact match “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…” 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 “professional cybersecurity 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 95 professional cybersecurity services based in San Francisco, United States

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

As of Sep 21, 2026

17.6%Verified-email coverage

52.2Average contacts per company

1-10Median size (employees)

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 95 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 “professional cybersecurity 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 874 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.

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

How many professional cybersecurity services are there based in San Francisco, United States?

RevenueBase identified 95 company matches for professional cybersecurity services associated with San Francisco, 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?

Bugcrowd 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 professional cybersecurity services?

New York leads the United States with 208 company records, followed by Atlanta (125) and Austin (122). San Francisco has 95.

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 874 professional contacts with verified work emails tracked across these 95 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.