Company lists · Data refreshed September 2026

Top 25 Cybersecurity startups based in San Francisco, United States

Name: Cybersecurity startups 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 136 companies tracked

RevenueBase identified 136 cybersecurity startups headquartered in San Francisco, United States as of September 2026 and tracks 6,798 professional contacts across them, including 2,078 with verified work emails and 1,218 with mobile numbers. New York is the largest hub.

This list covers cybersecurity startups 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

136Companies

6,798Contacts tracked

2,078Verified emails

1,218Mobile numbers

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

Ranked by team size

Top 25 of 136 cybersecurity startups 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 startups: 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	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 10, 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 10, 2026
5	Securitypal AI	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 10, 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 10, 2026
6	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
7	TAC Security	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 10, 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 10, 2026
8	Socket	Partial evidence	San Francisco, United StatesHQ checked Sep 10, 2026	51-200	80 contacts →
	Partial evidence “Socket is a cybersecurity platform that protects companies from software supply chain attacks.” Source: RevenueBase Database · checked Sep 10, 2026
9	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
10	Nightdragon	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 10, 2026	11-50	46 contacts →
	Partial 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
11	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
12	Practical Devsecops	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 10, 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 10, 2026
13	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
14	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
15	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
16	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
17	Sentant	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 10, 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 10, 2026
18	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
19	Blackfog	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 10, 2026	11-50	22 contacts →
	Partial evidence “BlackFog is a global leader in AI-based cybersecurity and the pioneer of anti data exfiltration (ADX) technology.” Source: RevenueBase Database · checked Sep 10, 2026
20	Code RED Partners	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 10, 2026	1-10	20 contacts →
	Indirect evidence “Code Red specializes in cyber security staffing.” Source: RevenueBase Database · checked Sep 10, 2026
21	Shield Capital	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 10, 2026	1-10	20 contacts →
	Partial evidence “Shield Capital is a team of veteran investors, founders and national security leaders who are helping founders build frontier solutions in cybersecurity, artificial intelligence…” Source: RevenueBase Database · checked Sep 10, 2026
22	Operant AI	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 10, 2026	11-50	16 contacts →
	Partial evidence “Operant AI is an industry-defining cybersecurity leader at the forefront of securing AI & MCP.” Source: RevenueBase Database · checked Sep 10, 2026
23	Epiccyber	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 10, 2026	11-50	14 contacts →
	Partial evidence “EpicCyber: Empowering Your Business with Zscaler, Crowd strike, and Okta Cybersecurity Solutions” Source: RevenueBase Database · checked Sep 10, 2026
24	Ysecurity	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 10, 2026	11-50	14 contacts →
	Partial evidence “We are a team of cybersecurity operators from Silicon Valley.” Source: RevenueBase Database · checked Sep 10, 2026
25	overe.io	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 10, 2026	11-50	11 contacts →
	Partial evidence “Overe's SaaS Security platform provides businesses with a comprehensive but easy-to-use Cybersecurity service.” 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 startups. 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 startups.
Partial evidence: Its own public description names part of cybersecurity startups, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name cybersecurity startups. 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 136 cybersecurity startups based in San Francisco, United States

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

As of Sep 10, 2026

30.6%Verified-email coverage

17.9%Mobile-number coverage

50.0Average contacts per company

11-50Median size (employees)

167.6%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

Freshness & accuracy

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

Email last verified

Median 12.0d

1,9010–30

17331–60

061–90

290–180

2180+

Company record updated

Median 54.0d

00–30

3,94431–60

1,63761–90

75990–180

458180+

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 startups, 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 startups”. 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 startups), 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 startups, 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, 2,078 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 startups by metro in the United States

Cybersecurity startups in New York228
Cybersecurity startups in San Francisco128
Cybersecurity startups in Austin122
Cybersecurity startups in Washington109
Cybersecurity startups in Atlanta108
Cybersecurity startups in Miami104
Cybersecurity startups in Houston103

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 startups, 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 startups are there based in San Francisco, United States?

RevenueBase identified 136 cybersecurity startups 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 startups?

New York leads with 228 headquartered companies, followed by San Francisco (128) and Austin (122).

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 2,078 verified decision-maker contacts tracked across these 136 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.