Company lists · Data refreshed September 2026

Top 25 Cybersecurity services and solutions based in San Francisco, United States

Name: Cybersecurity services and solutions 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 24, 2026 173 companies tracked

RevenueBase identified 173 cybersecurity services and solutions headquartered in San Francisco, United States as of September 2026 and tracks 13,713 professional contacts across them, including 2,824 with verified work emails. New York is the largest hub.

This list covers cybersecurity services and solutions 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 24, 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 24, 2026 86% judged on-target in blind review

173Companies

13,713Contacts tracked

2,824Verified emails

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

Ranked by team size

Top 25 of 173 cybersecurity services and solutions based in San Francisco, United States, ranked by team size, largest first. Data refreshed Sep 24, 2026. RevenueBase Smart Search rates how each company's information relates to cybersecurity services and solutions: 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	Hackerone	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 24, 2026	n/a	6,058 contacts →
	Partial evidence “HackerOne is a global leader in Continuous Threat Exposure Management (CTEM) and the only solution provider that pairs the simultaneous trust of the Fortune 500 and the world's…” Source: RevenueBase Database · checked Sep 24, 2026
2	Bugcrowd	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 24, 2026	n/a	3,649 contacts →
	Indirect evidence “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…” Source: RevenueBase Database · checked Sep 24, 2026
3	Coalition, INC	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 24, 2026	501-1,000	724 contacts →
	Indirect evidence “Coalition is the world's first Active Insurance provider designed to help prevent digital risk before it strikes.” Source: RevenueBase Database · checked Sep 24, 2026
4	Nozomi Networks	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 24, 2026	201-500	375 contacts →
	Indirect evidence “We protect the world’s critical infrastructure from cyber threats.” Source: RevenueBase Database · checked Sep 24, 2026
5	horizon3.ai	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 24, 2026	201-500	364 contacts →
	Partial evidence “Horizon3.ai answers the two most important questions in cybersecurity: If someone tried to compromise us, would we hold up?” Source: RevenueBase Database · checked Sep 24, 2026
6	At-Bay	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 24, 2026	201-500	348 contacts →
	Indirect evidence “At-Bay is the world’s first InsurSec provider designed from the ground up to help businesses tackle cyber risk head on.” Source: RevenueBase Database · checked Sep 24, 2026
7	Securitypal AI	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 24, 2026	201-500	263 contacts →
	Partial evidence “SecurityPal is a Cybersecurity Assurance Management Platform that blends AI-powered automation with expert oversight to help organizations accelerate trust, reduce friction, and…” Source: RevenueBase Database · checked Sep 24, 2026
8	Vehere	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 24, 2026	201-500	211 contacts →
	Indirect evidence “Vehere is an AI cyber defense company operating at the intersection of national security and enterprise security.” Source: RevenueBase Database · checked Sep 24, 2026
9	TAC Security	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 24, 2026	51-200	208 contacts →
	Partial evidence “TAC Security (NSE: TAC) TAC Security, a leading publicly listed global cybersecurity company specializing in vulnerability management, today serves clients across 100 countries…” Source: RevenueBase Database · checked Sep 24, 2026
10	Jones IT	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 24, 2026	51-200	82 contacts →
	Indirect evidence “At Jones IT, we believe IT should make your life easier- not more complicated.” Source: RevenueBase Database · checked Sep 24, 2026
11	Bastille	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 24, 2026	51-200	66 contacts →
	Partial evidence “Bastille is the leader in Wireless Airspace Cybersecurity.” Source: RevenueBase Database · checked Sep 24, 2026
12	Mondoo	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 24, 2026	51-200	55 contacts →
	Indirect evidence “Mondoo's Agentic Managed Vulnerability Service, a combination of local expert security professionals and a proven AI-native platform, delivers the outcomes security professionals…” Source: RevenueBase Database · checked Sep 24, 2026
13	Cloudmark	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 24, 2026	51-200	53 contacts →
	Indirect evidence “Cloudmark was acquired by Proofpoint.” Source: RevenueBase Database · checked Sep 24, 2026
14	Escape	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 24, 2026	11-50	43 contacts →
	Indirect evidence “Escape automates the full offensive security lifecycle, multiplying the impact of every security engineer tenfold.” Source: RevenueBase Database · checked Sep 24, 2026
15	Practical Devsecops	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 24, 2026	11-50	40 contacts →
	Partial evidence “Practical DevSecOps is a global cybersecurity education company specializing in hands-on DevSecOps, AI Security, and Application Security training and certifications.” Source: RevenueBase Database · checked Sep 24, 2026
16	PCS Technology	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 24, 2026	11-50	36 contacts →
	Indirect evidence “At PCS Technology, we know how important it is for nonprofits to trust that their systems are secure and well-managed.” Source: RevenueBase Database · checked Sep 24, 2026
17	akto.io	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 24, 2026	11-50	33 contacts →
	Indirect evidence “Akto is the fastest growing AI Security platform for your teams to secure AI agents, MCPs, LLMs, Agent skills, gen AI apps in your organization.” Source: RevenueBase Database · checked Sep 24, 2026
18	Strongestlayer	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 24, 2026	51-200	30 contacts →
	Indirect evidence “Enhanced security in minutes and get immediately unparalleled protection.” Source: RevenueBase Database · checked Sep 24, 2026
19	Upfort	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 24, 2026	11-50	29 contacts →
	Indirect evidence “Upfort is a leading platform for cyber security and insurance that provides holistic protection from evolving cyber threats.” Source: RevenueBase Database · checked Sep 24, 2026
20	Dataway	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 24, 2026	11-50	28 contacts →
	Indirect evidence “Dataway, Inc.” Source: RevenueBase Database · checked Sep 24, 2026
21	Seworks	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 24, 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 24, 2026
22	Actifile	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 24, 2026	11-50	25 contacts →
	Indirect evidence “Actifile helps organizations automate their Data Discovery, Monitoring and Protection needs, addressing external data threats (like ransomware), insider threats (like shadow IT)…” Source: RevenueBase Database · checked Sep 24, 2026
23	Atomus	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 24, 2026	11-50	24 contacts →
	Indirect evidence “A technology driven Managed Security Service Provider purpose built for Aerospace and Defense.” Source: RevenueBase Database · checked Sep 24, 2026
24	Sentant	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 24, 2026	11-50	24 contacts →
	Partial evidence “Sentant is a next-generation cybersecurity & IT services firm with a team of experienced technology professionals.” Source: RevenueBase Database · checked Sep 24, 2026
25	Centarus	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 24, 2026	11-50	22 contacts →
	Partial 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 24, 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: cybersecurity services and solutions. 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 cybersecurity services and solutions.
Partial evidence: Its own public description names part of cybersecurity services and solutions, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name cybersecurity services and solutions. 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 25 of 173 cybersecurity services and solutions based in San Francisco, United States

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Cybersecurity services and solutions based in San Francisco, United States at a glance

As of Sep 24, 2026

20.6%Verified-email coverage

79.3Average contacts per company

11-50Median size (employees)

264.2%Largest-city concentration · New York

Sep 24, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

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 173 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 cybersecurity services and solutions, 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 “cybersecurity services and solutions”. 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 cybersecurity services and solutions), 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 cybersecurity services and solutions, 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, 2,824 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 24, 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.

Cybersecurity services and solutions 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 cybersecurity services and solutions, 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 cybersecurity services and solutions are there based in San Francisco, United States?

RevenueBase identified 173 cybersecurity services and solutions 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?

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

Which city has the most cybersecurity services and solutions?

New York leads with 457 headquartered companies, followed by Houston (271) and Washington (235).

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 2,824 verified decision-maker contacts tracked across these 173 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 24, 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.