Company lists · Data refreshed September 2026

Top 25 Cybersecurity businesses based in Seattle, United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 78 companies tracked

RevenueBase identified 78 cybersecurity businesses headquartered in Seattle, United States as of September 2026 and tracks 2,441 professional contacts across them, including 1,413 with verified work emails. New York is the largest hub.

This list covers cybersecurity businesses headquartered in Seattle, 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

78Companies

2,441Contacts tracked

1,413Verified emails

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The 25 largest cybersecurity businesses based in Seattle, United States

Ranked by team size

Top 25 of 78 cybersecurity businesses based in Seattle, 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	Watchguard Technologies	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,059 contacts →
	Indirect evidence “WatchGuard® Technologies, Inc.” Source: RevenueBase Database · checked Sep 21, 2026
2	Absolute Security	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 21, 2026	501-1,000	794 contacts →
	Indirect evidence “Absolute Security is partnered with more than 28 of the world’s leading endpoint device manufacturers, embedded in the firmware of 600 million devices, trusted by global…” Source: RevenueBase Database · checked Sep 21, 2026
3	Ioactive, INC	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 21, 2026	51-200	107 contacts →
	Indirect evidence “IOActive is a trusted partner for Global enterprises, providing research-fueled security services across all industries.” Source: RevenueBase Database · checked Sep 21, 2026
4	Dropzone AI	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 21, 2026	51-200	54 contacts →
	Indirect evidence “Dropzone AI weaponizes LLMs for cyber defenders, delivering the Agentic SOC: AI agents that collaborate 24/7 to beat attackers at scale.” Source: RevenueBase Database · checked Sep 21, 2026
5	Mirai Security	Strong evidence	Seattle, WA, United StatesHQ checked Sep 21, 2026	11-50	27 contacts →
	Strong evidence “We are a cybersecurity company specializing in governance, risk management and compliance, Cloud Security, and Application Security.” Source: RevenueBase Database · checked Sep 21, 2026
6	Defiant	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 21, 2026	11-50	24 contacts →
	Indirect evidence “Defiant is the industry leader in website security.” Source: RevenueBase Database · checked Sep 21, 2026
7	Dynamic Computing	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 21, 2026	11-50	24 contacts →
	Indirect evidence “Dynamic Computing helps companies and organizations in Seattle and across the Puget Sound region achieve their goals through technology.” Source: RevenueBase Database · checked Sep 21, 2026
8	Sentry Computing	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 21, 2026	11-50	22 contacts →
	Indirect evidence “Sentry Computing builds smart IT solutions that keep your day-to-day operations running smoothly.” Source: RevenueBase Database · checked Sep 21, 2026
9	DSE	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 21, 2026	11-50	22 contacts →
	Indirect evidence “DSE is a boutique security firm with a focus on Active Directory.” Source: RevenueBase Database · checked Sep 21, 2026
10	Swat Systems	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 21, 2026	11-50	20 contacts →
	Indirect evidence “SWAT Systems is now Convergence Networks!” Source: RevenueBase Database · checked Sep 21, 2026
11	LAW & Forensics, Digital Forensics And Legal Engineering For Complex Matters	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 21, 2026	11-50	15 contacts →
	Indirect evidence “Law & Forensics is a global legal engineering firm, serving clients in all 50 states and more than 25 countries, with solutions for Cyber Security, Cyber Warfare, eDiscovery…” Source: RevenueBase Database · checked Sep 21, 2026
12	Phishcloud INC	Strong evidence	Seattle, WA, United StatesHQ checked Sep 21, 2026	1-10	13 contacts →
	Strong evidence “PhishCloud's OT/IT Cyber Fusion Strategies unify industrial and enterprise cybersecurity into a centralized, operationally-aware capability.” Source: RevenueBase Database · checked Sep 21, 2026
13	Forge Technology Advisors	Strong evidence	Seattle, WA, United StatesHQ checked Sep 21, 2026	11-50	7 contacts →
	Strong evidence “Forge Technology Advisors provides a customized suite of IT and Telecommunications consulting services-including Cybersecurity, SASE, UCaaS, CCaaS, and Networking-tailored to meet…” Source: RevenueBase Database · checked Sep 21, 2026
14	Vivid Technical Consulting LLC	Strong evidence	Seattle, WA, United StatesHQ checked Sep 21, 2026	1-10	7 contacts →
	Strong evidence “Vivid Technical Consulting makes cybersecurity compliance achievable for every contractor in the defense industrial base.” Source: RevenueBase Database · checked Sep 21, 2026
15	Protect AI	Strong evidence	Seattle, WA, United StatesHQ checked Sep 21, 2026	11-50	6 contacts →
	Strong evidence “Protect AI is a cybersecurity company focused on AI & ML systems.” Source: RevenueBase Database · checked Sep 21, 2026
16	Bigfilter	Strong evidence	Seattle, WA, United StatesHQ checked Sep 21, 2026	1-10	5 contacts →
	Strong evidence “Generative AI has shifted the cybersecurity landscape, reducing the time it takes to create hyper-convincing phishing and fraud by 200x.” Source: RevenueBase Database · checked Sep 21, 2026
17	Security Research Group	Strong evidence	Seattle, WA, United StatesHQ checked Sep 21, 2026	1-10	5 contacts →
	Strong evidence “Security Research Group provides military-grade cybersecurity solutions, specializing in threat detection, compliance, incident response, and custom cyber strategies to protect…” Source: RevenueBase Database · checked Sep 21, 2026
18	Digital Seattle, INC	Strong evidence	Seattle, WA, United StatesHQ checked Sep 21, 2026	51-200	5 contacts →
	Strong evidence “Intelligent Technical Solutions is your trusted business partner for all your Cybersecurity, Managed and Co-managed IT support, Risk & Compliance, Data Analytics, and Consulting…” Source: RevenueBase Database · checked Sep 21, 2026
19	Alpha Level	Strong evidence	Seattle, WA, United StatesHQ checked Sep 21, 2026	1-10	5 contacts →
	Strong evidence “Alpha Level is a next-generation cybersecurity company transforming how Security Operations Centers (SOCs) detect and respond to threats.” Source: RevenueBase Database · checked Sep 21, 2026
20	Fitted Tech	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 21, 2026	1-10	4 contacts →
	Indirect evidence “Fitted Tech is a local, family-run technology solutions company based in North Bend, Washington.” Source: RevenueBase Database · checked Sep 21, 2026
21	Vertiance	Strong evidence	Seattle, United StatesHQ checked Sep 21, 2026	1-10	4 contacts →
	Strong evidence “Trusted IT support, strategy, and cybersecurity for small businesses.” Source: RevenueBase Database · checked Sep 21, 2026
22	Proportional	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 21, 2026	1-10	4 contacts →
	Indirect evidence “Proportional provides a range of services to safeguard the communications, data and privacy of key individuals and their closest confidants.” Source: RevenueBase Database · checked Sep 21, 2026
23	Aishield INC	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 21, 2026	1-10	3 contacts →
	Indirect evidence “aiShield is dedicated to protecting seniors from the growing threat of cybercrime using advanced AI technology.” Source: RevenueBase Database · checked Sep 21, 2026
24	Kahu Group	Strong evidence	Seattle, WA, United StatesHQ checked Sep 21, 2026	1-10	3 contacts →
	Strong evidence “We are a boutique cybersecurity firm dedicated to meticulous foundations, straightforward processes, and going beyond best practices.” Source: RevenueBase Database · checked Sep 21, 2026
25	Crystal Peak Security	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 21, 2026	1-10	3 contacts →
	Indirect evidence “A small, surgical team of security specialists with deep expertise in embedded systems, IoT, and connected hardware.” 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 78 cybersecurity businesses based in Seattle, United States

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Cybersecurity businesses based in Seattle, United States at a glance

As of Sep 21, 2026

57.9%Verified-email coverage

31.3Average contacts per company

1-10Median size (employees)

516.7%Largest-city concentration · New York

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

501-1,000

1,001-5,000

Email recency for this list is measured across the whole United States list rather than for Seattle, so it is reported there. Company counts and contact totals on this page are exact for Seattle, over 78 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 Seattle, 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 Seattle 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, 1,413 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 Seattle, United States?

RevenueBase identified 78 cybersecurity businesses headquartered in Seattle, 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?

Watchguard Technologies, headquartered in Seattle, 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 1,413 verified decision-maker contacts tracked across these 78 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.