Company lists · Data refreshed September 2026

Top 25 Cybersecurity firms based in San Francisco, United States

Name: Cybersecurity firms 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 10, 2026 183 companies tracked

RevenueBase identified 183 cybersecurity firms headquartered in San Francisco, United States as of September 2026 and tracks 7,590 professional contacts across them, including 2,491 with verified work emails and 1,512 with mobile numbers. New York is the largest hub.

This list covers cybersecurity firms 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 10, 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 10, 2026 86% judged on-target in blind review

183Companies

7,590Contacts tracked

2,491Verified emails

1,512Mobile numbers

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The 25 largest cybersecurity firms based in San Francisco, United States

Ranked by team size

Top 25 of 183 cybersecurity firms based in San Francisco, United States, ranked by team size, largest first. Data refreshed Sep 10, 2026. RevenueBase Smart Search rates how each company's information relates to cybersecurity firms: 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	Bugcrowd	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 10, 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 10, 2026
2	Coalition, INC	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 10, 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 10, 2026
3	Nozomi Networks	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 10, 2026	201-500	375 contacts →
	Indirect evidence “We protect the world’s critical infrastructure from cyber threats.” Source: RevenueBase Database · checked Sep 10, 2026
4	horizon3.ai	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 10, 2026	201-500	364 contacts →
	Strong 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 10, 2026
5	At-Bay	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 10, 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 10, 2026
6	Securitypal AI	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 10, 2026	201-500	263 contacts →
	Strong 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 10, 2026
7	Vehere	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 10, 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 10, 2026
8	TAC Security	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 10, 2026	51-200	208 contacts →
	Strong 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 10, 2026
9	Cybercube	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 10, 2026	51-200	124 contacts →
	Indirect evidence “CyberCube is delivering the world’s leading cyber risk modeling and analytics.” Source: RevenueBase Database · checked Sep 10, 2026
10	Socket	Strong evidence	San Francisco, United StatesHQ checked Sep 10, 2026	51-200	80 contacts →
	Strong evidence “Socket is a cybersecurity platform that protects companies from software supply chain attacks.” Source: RevenueBase Database · checked Sep 10, 2026
11	Bastille	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 10, 2026	51-200	66 contacts →
	Strong evidence “Bastille is the leader in Wireless Airspace Cybersecurity.” Source: RevenueBase Database · checked Sep 10, 2026
12	Cloudmark	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 10, 2026	51-200	53 contacts →
	Indirect evidence “Cloudmark was acquired by Proofpoint.” Source: RevenueBase Database · checked Sep 10, 2026
13	Nightdragon	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 10, 2026	11-50	46 contacts →
	Strong evidence “NightDragon is an investment and advisory firm focused on investing in growth and late-stage companies within the cybersecurity, safety, security, and privacy industry.” Source: RevenueBase Database · checked Sep 10, 2026
14	Escape	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 10, 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 10, 2026
15	Practical Devsecops	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 10, 2026	11-50	40 contacts →
	Strong 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 10, 2026
16	akto.io	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 10, 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 10, 2026
17	Strongestlayer	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 10, 2026	51-200	30 contacts →
	Indirect evidence “Enhanced security in minutes and get immediately unparalleled protection.” Source: RevenueBase Database · checked Sep 10, 2026
18	Upfort	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 10, 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 10, 2026
19	Dataway	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 10, 2026	11-50	28 contacts →
	Indirect evidence “Dataway, Inc.” Source: RevenueBase Database · checked Sep 10, 2026
20	Seworks	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 10, 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 10, 2026
21	Symmetry Systems	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 10, 2026	11-50	26 contacts →
	Indirect evidence “Symmetry is the Data+AI Security Company.” Source: RevenueBase Database · checked Sep 10, 2026
22	Actifile	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 10, 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 10, 2026
23	Atomus	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 10, 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 10, 2026
24	Sentant	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 10, 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 10, 2026
25	Doyensec	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 10, 2026	11-50	23 contacts →
	Indirect evidence “Doyensec is an independent security research and development company focused on vulnerability discovery and remediation.” Source: RevenueBase Database · checked Sep 10, 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 firms. 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 firms.
Partial evidence: Its own public description names part of cybersecurity firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name cybersecurity firms. 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 183 cybersecurity firms based in San Francisco, United States

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Cybersecurity firms based in San Francisco, United States at a glance

As of Sep 10, 2026

32.8%Verified-email coverage

19.9%Mobile-number coverage

41.5Average contacts per company

11-50Median size (employees)

178.1%Largest-city concentration · New York

Sep 10, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

10001+

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 12.0d

2,2840–30

19931–60

061–90

390–180

5180+

Company record updated

Median 54.0d

00–30

4,41431–60

1,85661–90

81790–180

503180+

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 firms, 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 firms”. 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 firms), 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 firms, 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, 2,491 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 10, 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 firms 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 firms, 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 firms are there based in San Francisco, United States?

RevenueBase identified 183 cybersecurity firms 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?

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

Which city has the most cybersecurity firms?

New York leads with 326 headquartered companies, followed by Washington (184) and Austin (181).

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 2,491 verified decision-maker contacts tracked across these 183 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 10, 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.