Company lists · Data refreshed September 2026

Top 25 Cybersecurity agencies based in Boston, United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 58 companies tracked

RevenueBase identified 58 cybersecurity agencies headquartered in Boston, United States as of September 2026 and tracks 4,227 professional contacts across them, including 1,820 with verified work emails. New York is the largest hub.

This list covers cybersecurity agencies headquartered in Boston, 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

58Companies

4,227Contacts tracked

1,820Verified emails

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The 25 largest cybersecurity agencies based in Boston, United States

Ranked by team size

Top 25 of 58 cybersecurity agencies based in Boston, 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 agencies: 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	Rapid7	Strong evidence	Boston, MA, United StatesHQ checked Sep 21, 2026	1,001-5,000	2,822 contacts →
	Strong evidence “Rapid7, Inc.(NASDAQ: RPD) is a global leader in AI-powered managed cybersecurity operations, trusted to advance organizations’ cyber resilience.” Source: RevenueBase Database · checked Sep 21, 2026
2	Bitsight	Indirect evidence	Boston, MA, United StatesHQ checked Sep 21, 2026	501-1,000	752 contacts →
	Indirect evidence “Bitsight is the global leader in cyber risk intelligence, leveraging advanced AI to empower organizations with precise insights derived from the industry’s most extensive external…” Source: RevenueBase Database · checked Sep 21, 2026
3	Cynet Security	Strong evidence	Boston, MA, United StatesHQ checked Sep 21, 2026	201-500	309 contacts →
	Strong evidence “Cynet’s unified, AI-powered cybersecurity platform brings together a full suite of security capabilities in a single, simple solution, backed by 24x7 SOC support.” Source: RevenueBase Database · checked Sep 21, 2026
4	Abusix, INC	Indirect evidence	Boston, MA, United StatesHQ checked Sep 21, 2026	11-50	31 contacts →
	Indirect evidence “At Abusix, we empower businesses, ISPs, and email service providers with cutting-edge security solutions to safeguard digital infrastructure.” Source: RevenueBase Database · checked Sep 21, 2026
5	Bradford Networks	Indirect evidence	Boston, MA, United StatesHQ checked Sep 21, 2026	51-200	22 contacts →
	Indirect evidence “Bradford Networks, a Fortinet Company, provides complete visibility into all network endpoints, enhance access control, & take security to the network edge.” Source: RevenueBase Database · checked Sep 21, 2026
6	Freeze	Strong evidence	Boston, MA, United StatesHQ checked Sep 21, 2026	11-50	22 contacts →
	Strong evidence “Freeze is the premium cybersecurity and privacy solution trusted by leading organizations to mitigate risks such as social engineering, phishing, financial fraud, hacks, attacks…” Source: RevenueBase Database · checked Sep 21, 2026
7	Colossus Technologies Group	Strong evidence	Boston, MA, United StatesHQ checked Sep 21, 2026	1-10	18 contacts →
	Strong evidence “At Colossus Technologies Group, we provide top-tier cybersecurity and digital trust staffing, IT consulting, and project management solutions, including privacy, security, and GRC…” Source: RevenueBase Database · checked Sep 21, 2026
8	Acelium	Strong evidence	Boston, United StatesHQ checked Sep 21, 2026	51-200	14 contacts →
	Strong evidence “Is a cybersecurity engineering company that delivers live operational and executive oversight of IT infrastructure and cybersecurity posture to enterprise customers globally.” Source: RevenueBase Database · checked Sep 21, 2026
9	Proinf	Strong evidence	Boston, MA, United StatesHQ checked Sep 21, 2026	51-200	14 contacts →
	Strong evidence “Proinf is a complete suite of Cybersecurity and Professional Services Provider.” Source: RevenueBase Database · checked Sep 21, 2026
10	EOS Systems	Indirect evidence	Boston, MA, United StatesHQ checked Sep 21, 2026	11-50	13 contacts →
	Indirect evidence “Eos Systems, a leader in cyber security and technology delivery services, has been helping clients solve complex technology challenges for over 25 years.” Source: RevenueBase Database · checked Sep 21, 2026
11	247 Group, LC	Indirect evidence	Boston, MA, United StatesHQ checked Sep 21, 2026	1-10	12 contacts →
	Indirect evidence “Security advice to Federal Government, small and large businesses - Business development & consulting - DoD related Internet of Things (IoT) consulting - Military program…” Source: RevenueBase Database · checked Sep 21, 2026
12	Vault America	Indirect evidence	Boston, MA, United StatesHQ checked Sep 21, 2026	1-10	7 contacts →
	Indirect evidence “Since 2004, Vault America has safeguarded customers’ data and their businesses with automated and scalable, industry compliant cyber and data security services, aligned under our…” Source: RevenueBase Database · checked Sep 21, 2026
13	FYEO	Strong evidence	Boston, MA, United StatesHQ checked Sep 21, 2026	11-50	6 contacts →
	Strong evidence “FYEO is a leading cybersecurity company that utilizes the power of AI and decentralized technologies to secure individuals and enterprises from cyber threats.” Source: RevenueBase Database · checked Sep 21, 2026
14	Medware Cyber	Strong evidence	Boston, MA, United StatesHQ checked Sep 21, 2026	1-10	6 contacts →
	Strong evidence “Medical Device Cybersecurity play a crucial role in the healthcare ecosystem.” Source: RevenueBase Database · checked Sep 21, 2026
15	Seralys	Strong evidence	Boston, United StatesHQ checked Sep 21, 2026	1-10	5 contacts →
	Strong evidence “Seralys is a boutique cybersecurity firm founded in 2012.” Source: RevenueBase Database · checked Sep 21, 2026
16	Securityweek	Strong evidence	Boston, MA, United StatesHQ checked Sep 21, 2026	11-50	5 contacts →
	Strong evidence “SecurityWeek is at the forefront of cybersecurity news and stands as a pivotal and highly influential publication with a mission to help cybersecurity professionals defend their…” Source: RevenueBase Database · checked Sep 21, 2026
17	Hybridvalley	Indirect evidence	Boston, MA, United StatesHQ checked Sep 21, 2026	51-200	4 contacts →
	Indirect evidence “HybridValley is your technology consulting partner in all areas of information technology.” Source: RevenueBase Database · checked Sep 21, 2026
18	Infersight LLC	Indirect evidence	Boston, MA, United StatesHQ checked Sep 21, 2026	11-50	4 contacts →
	Indirect evidence “InferSight is one of the top trusted cyber security solutions partners in the industry.” Source: RevenueBase Database · checked Sep 21, 2026
19	Salt Cybersecurity	Strong evidence	Boston, MA, United StatesHQ checked Sep 21, 2026	11-50	4 contacts →
	Strong evidence “The SaltCISO Solution AN ESSENTIAL ALL-IN-ONE CYBERSECURITY SOLUTION Salt Cybersecurity sifted through the multitude of security products and services, determined what was most…” Source: RevenueBase Database · checked Sep 21, 2026
20	Spherium Consulting Group	Strong evidence	Boston, MA, United StatesHQ checked Sep 21, 2026	1-10	4 contacts →
	Strong evidence “Empowering organizations to secure their cloud, data, and identities with tailored protection and strategic expertise, we specialize in modern cybersecurity for Microsoft 365 and…” Source: RevenueBase Database · checked Sep 21, 2026
21	Kaliber Data Security	Indirect evidence	Boston, MA, United StatesHQ checked Sep 21, 2026	1-10	4 contacts →
	Indirect evidence “Kaliber helps companies Improve their cyber posture, reduce risk and improve AI security awareness.” Source: RevenueBase Database · checked Sep 21, 2026
22	Cisomate	Indirect evidence	Boston, United StatesHQ checked Sep 21, 2026	1-10	3 contacts →
	Indirect evidence “The expertise of a CISO fully integrated into an end-to-end automated processes technology solution.” Source: RevenueBase Database · checked Sep 21, 2026
23	Arsenal Cyber Force	Strong evidence	Boston, MA, United StatesHQ checked Sep 21, 2026	1-10	2 contacts →
	Strong evidence “At Arsenal we are dedicated to delivering premier cybersecurity solutions, safeguarding our clients' digital landscapes.” Source: RevenueBase Database · checked Sep 21, 2026
24	Quantumstrike	Strong evidence	Boston, MA, United StatesHQ checked Sep 21, 2026	201-500	1 contacts →
	Strong evidence “A global interdisciplinary analytics-driven and human-focused cybersecurity company which delivers innovative security solutions that ensure companies do what they do best -…” Source: RevenueBase Database · checked Sep 21, 2026
25	Santsec	Strong evidence	Boston, MA, United StatesHQ checked Sep 21, 2026	1-10	1 contacts →
	Strong evidence “Santsec's approach to cybersecurity leverages a blend of real-world experience and cutting-edge technology.” 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 agencies. 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 agencies.
Partial evidence: Its own public description names part of cybersecurity agencies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name cybersecurity agencies. 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 58 cybersecurity agencies based in Boston, United States

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Cybersecurity agencies based in Boston, United States at a glance

As of Sep 21, 2026

43.1%Verified-email coverage

72.9Average contacts per company

1-10Median size (employees)

336.2%Largest-city concentration · New York

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

10001+

Email recency for this list is measured across the whole United States list rather than for Boston, so it is reported there. Company counts and contact totals on this page are exact for Boston, over 58 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 agencies, 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 Boston, United States whose own description of what they do matches “cybersecurity agencies”. 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 agencies), 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 agencies, and records with no verified work email. Companies headquartered outside Boston 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, 1,820 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 agencies 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 agencies, 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 agencies are there based in Boston, United States?

RevenueBase identified 58 cybersecurity agencies headquartered in Boston, 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?

Rapid7, headquartered in Boston, tops this list with the largest team on record.

Which city has the most cybersecurity agencies?

New York leads with 195 headquartered companies, followed by Washington (146) and Atlanta (114).

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 1,820 verified decision-maker contacts tracked across these 58 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.