Company lists · Data refreshed September 2026

Top 25 Cybersecurity businesses based in San Diego, United States

Name: Cybersecurity businesses based in San Diego, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 129 companies tracked

RevenueBase identified 129 cybersecurity businesses headquartered in San Diego, United States as of September 2026 and tracks 1,735 professional contacts across them, including 724 with verified work emails. New York is the largest hub.

This list covers cybersecurity businesses headquartered in San Diego, 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

129Companies

1,735Contacts tracked

724Verified emails

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The 25 largest cybersecurity businesses based in San Diego, United States

Ranked by team size

Top 25 of 129 cybersecurity businesses based in San Diego, United States, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to cybersecurity businesses: 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	Cybereason, A Levelblue Company	Strong evidence	San Diego, CA, United StatesHQ checked Sep 21, 2026	1,001-5,000	574 contacts →
	Strong evidence “Cybereason, a LevelBlue company, is a global cybersecurity leader delivering advanced endpoint detection and response (EDR) and industry recognized consulting services to support…” Source: RevenueBase Database · checked Sep 21, 2026
2	Ausgar Technologies INC	Strong evidence	San Diego, CA, United StatesHQ checked Sep 21, 2026	51-200	148 contacts →
	Strong evidence “AUSGAR is a company of smart, innovative technical team members who can out-think problems faced by our customers in the cybersecurity, experimentation and engineering services…” Source: RevenueBase Database · checked Sep 21, 2026
3	Forward Slope, INC	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 21, 2026	51-200	108 contacts →
	Indirect evidence “Forward Slope is now part of Lyntris.” Source: RevenueBase Database · checked Sep 21, 2026
4	NTH Generation Computing	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 21, 2026	51-200	89 contacts →
	Indirect evidence “Since 1991, Nth Generation has provided industry leading, consultative IT services, encompassing a suite of IT and security solutions.” Source: RevenueBase Database · checked Sep 21, 2026
5	Sentek Global	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 21, 2026	51-200	81 contacts →
	Indirect evidence “Sentek Global is the firm of choice for spearheading and supporting government and commercial IT programs.” Source: RevenueBase Database · checked Sep 21, 2026
6	Templar Shield	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 21, 2026	51-200	49 contacts →
	Indirect evidence “Templar Shield is a specialized risk, security, identity and AI governance advisory firm helping organizations operate with confidence in an increasingly automated, AI-driven…” Source: RevenueBase Database · checked Sep 21, 2026
7	Triden Group	Strong evidence	San Diego, CA, United StatesHQ checked Sep 21, 2026	11-50	46 contacts →
	Strong evidence “Providing the Most Innovative and Intelligent Defense Available With the growth and evolution of cyber threats, cybersecurity has been thrust into the forefront of modern…” Source: RevenueBase Database · checked Sep 21, 2026
8	Infracore	Strong evidence	San Diego, CA, United StatesHQ checked Sep 21, 2026	51-200	40 contacts →
	Strong evidence “Infracore is a best-in-class Cybersecurity and IT Support Services firm.” Source: RevenueBase Database · checked Sep 21, 2026
9	Trustthink	Strong evidence	San Diego, CA, United StatesHQ checked Sep 21, 2026	11-50	27 contacts →
	Strong evidence “Founded in 2018, TrustThink provides cybersecurity engineering and system-of-systems assurance for complex, connected products and platforms.” Source: RevenueBase Database · checked Sep 21, 2026
10	ISC Group, LLC	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 21, 2026	11-50	23 contacts →
	Indirect evidence “At ISC, we provide comprehensive IT solutions tailored to the diverse needs of modern businesses.” Source: RevenueBase Database · checked Sep 21, 2026
11	Compuone	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 21, 2026	11-50	22 contacts →
	Indirect evidence “We are now serving IT needs in the greater Chicago area!” Source: RevenueBase Database · checked Sep 21, 2026
12	Polyswarm	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 21, 2026	51-200	20 contacts →
	Indirect evidence “PolySwarm is a crowdsourced threat intelligence marketplace that provides a more effective way to detect, analyze and respond to the latest threats, the ones more likely to go…” Source: RevenueBase Database · checked Sep 21, 2026
13	Garantir Cybersecurity	Strong evidence	San Diego, CA, United StatesHQ checked Sep 21, 2026	11-50	14 contacts →
	Strong evidence “Garantir is a cybersecurity company that provides advanced cryptographic solutions to the enterprise.” Source: RevenueBase Database · checked Sep 21, 2026
14	Taranet	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 21, 2026	1-10	14 contacts →
	Indirect evidence “Cyber Security Risk Management Taranet provides SME support to identify, mitigate, and manage cyber security risks.” Source: RevenueBase Database · checked Sep 21, 2026
15	Gryphon Online Safety, INC	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 21, 2026	11-50	13 contacts →
	Indirect evidence “San Diego startup that's revolutionizing home and small business network protection with AI powered cyber-security platform.” Source: RevenueBase Database · checked Sep 21, 2026
16	Holocom, INC	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 21, 2026	11-50	13 contacts →
	Indirect evidence “Holocom is the leading solutions provider of Protective Distribution Systems (PDS) for classified networks such as SIPRNet, JWICS, and other networks transmitting highly sensitive…” Source: RevenueBase Database · checked Sep 21, 2026
17	Integrated Planet, INC	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 21, 2026	11-50	12 contacts →
	Indirect evidence “INTEGRATED PLANET INC is an information technology and services company based out of 10755 SCRIPPS POWAY PKWY, SAN DIEGO, California, United States.” Source: RevenueBase Database · checked Sep 21, 2026
18	Cybercatch	Strong evidence	San Diego, CA, United StatesHQ checked Sep 21, 2026	11-50	11 contacts →
	Strong evidence “CyberCatch provides an innovative cybersecurity Software-as-a-Service (SaaS) platform designed for SMBs.” Source: RevenueBase Database · checked Sep 21, 2026
19	Morado	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 21, 2026	11-50	10 contacts →
	Indirect evidence “There is more cyber threat intelligence available today than ever before, but the challenge is knowing what is actionable and having the tools to act on it.” Source: RevenueBase Database · checked Sep 21, 2026
20	Cyberdoc	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 21, 2026	1-10	9 contacts →
	Indirect evidence “Founded in 1995 in San Diego, CyberDoc delivers exceptional on-site and remote IT support tailored to the needs of small businesses.” Source: RevenueBase Database · checked Sep 21, 2026
21	Tbdcyber	Strong evidence	San Diego, CA, United StatesHQ checked Sep 21, 2026	11-50	9 contacts →
	Strong evidence “TBDCyber is a cybersecurity company focused on strategy, assessments, and program build services.” Source: RevenueBase Database · checked Sep 21, 2026
22	Trustfour Technologies	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 21, 2026	11-50	9 contacts →
	Indirect evidence “TrustFour is a pioneer in workload and non-human identity security, providing innovative solutions for compliance, remediation, post quantum resiliency, and advanced threat…” Source: RevenueBase Database · checked Sep 21, 2026
23	Xonicwave	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 21, 2026	11-50	8 contacts →
	Indirect evidence “Xonicwave specializes in delivering premier IT Managed Services and Solutions in Southern California.” Source: RevenueBase Database · checked Sep 21, 2026
24	Meijun	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 21, 2026	1-10	8 contacts →
	Indirect evidence “Meijun is a technology solutions provider that specializes in creating tailored, innovative technology solutions to help businesses achieve their objectives.” Source: RevenueBase Database · checked Sep 21, 2026
25	Network Titan	Strong evidence	San Diego, CA, United StatesHQ checked Sep 21, 2026	11-50	7 contacts →
	Strong evidence “Network Titan provides Managed and Co-Managed IT Support and Cybersecurity Services delivering expert, rapid response complete IT Support, Networking, Server, Cloud Solutions…” 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: cybersecurity businesses. 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 businesses.
Partial evidence: Its own public description names part of cybersecurity businesses, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name cybersecurity businesses. 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 129 cybersecurity businesses based in San Diego, United States

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Cybersecurity businesses based in San Diego, United States at a glance

As of Sep 21, 2026

41.7%Verified-email coverage

13.4Average contacts per company

1-10Median size (employees)

312.4%Largest-city concentration · New York

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

1,001-5,000

Email recency for this list is measured across the whole United States list rather than for San Diego, so it is reported there. Company counts and contact totals on this page are exact for San Diego, over 129 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 businesses, 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 Diego, United States whose own description of what they do matches “cybersecurity businesses”. 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 businesses), 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 businesses, and records with no verified work email. Companies headquartered outside San Diego 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, 724 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.

Cybersecurity businesses 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 businesses, 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 businesses are there based in San Diego, United States?

RevenueBase identified 129 cybersecurity businesses headquartered in San Diego, 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?

Cybereason, A Levelblue Company, headquartered in San Diego, tops this list with the largest team on record.

Which city has the most cybersecurity businesses?

New York leads with 403 headquartered companies, followed by Austin (207) and Washington (203).

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 724 verified decision-maker contacts tracked across these 129 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.