Company lists · Data refreshed September 2026

Top 25 Cybersecurity startups based in Boston, United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 14, 2026 61 companies tracked

RevenueBase identified 61 cybersecurity startups headquartered in Boston, United States as of September 2026 and tracks 3,914 professional contacts across them, including 1,871 with verified work emails. New York is the largest hub.

This list covers cybersecurity startups 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 14, 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 14, 2026 86% judged on-target in blind review

61Companies

3,914Contacts tracked

1,871Verified emails

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The 25 largest cybersecurity startups based in Boston, United States

Ranked by team size

Top 25 of 61 cybersecurity startups based in Boston, United States, ranked by team size, largest first. Data refreshed Sep 14, 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	Rapid7	Partial evidence	Boston, MA, United StatesHQ checked Sep 14, 2026	1,001-5,000	2,822 contacts →
	Partial 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 14, 2026
2	Onapsis	Partial evidence	Boston, MA, United StatesHQ checked Sep 14, 2026	201-500	338 contacts →
	Partial evidence “Onapsis is the global leader in SAP cybersecurity and compliance, trusted by the world’s leading organizations to securely accelerate their SAP cloud digital transformations with…” Source: RevenueBase Database · checked Sep 14, 2026
3	Cynet Security	Partial evidence	Boston, MA, United StatesHQ checked Sep 14, 2026	201-500	309 contacts →
	Partial 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 14, 2026
4	EIQ Networks	Indirect evidence	Boston, MA, United StatesHQ checked Sep 14, 2026	51-200	57 contacts →
	Indirect evidence “EiQ, a pioneer in hybrid security as a service, is transforming how mid-market organizations build enterprise-class security programs.” Source: RevenueBase Database · checked Sep 14, 2026
5	Abusix, INC	Indirect evidence	Boston, MA, United StatesHQ checked Sep 14, 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 14, 2026
6	Bradford Networks	Indirect evidence	Boston, MA, United StatesHQ checked Sep 14, 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 14, 2026
7	Freeze	Partial evidence	Boston, MA, United StatesHQ checked Sep 14, 2026	11-50	22 contacts →
	Partial 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 14, 2026
8	Tech Superpowers, An IT Solutions Company	Indirect evidence	Boston, MA, United StatesHQ checked Sep 14, 2026	11-50	21 contacts →
	Indirect evidence “We help our clients do great things.” Source: RevenueBase Database · checked Sep 14, 2026
9	Tausight	Partial evidence	Boston, MA, United StatesHQ checked Sep 14, 2026	11-50	21 contacts →
	Partial evidence “Protecting patient healthcare information is the #1 cybersecurity objective within the $3 trillion U.S.” Source: RevenueBase Database · checked Sep 14, 2026
10	Colossus Technologies Group	Partial evidence	Boston, MA, United StatesHQ checked Sep 14, 2026	1-10	18 contacts →
	Partial 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 14, 2026
11	Acelium	Partial evidence	Boston, United StatesHQ checked Sep 14, 2026	51-200	14 contacts →
	Partial 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 14, 2026
12	Proinf	Partial evidence	Boston, MA, United StatesHQ checked Sep 14, 2026	51-200	14 contacts →
	Partial evidence “Proinf is a complete suite of Cybersecurity and Professional Services Provider.” Source: RevenueBase Database · checked Sep 14, 2026
13	EOS Systems	Indirect evidence	Boston, MA, United StatesHQ checked Sep 14, 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 14, 2026
14	Full Armor Corporation	Indirect evidence	Boston, MA, United StatesHQ checked Sep 14, 2026	11-50	13 contacts →
	Indirect evidence “Full Armor Corporation is a leader in Cyber Security and in System & Group Policy Management.” Source: RevenueBase Database · checked Sep 14, 2026
15	FYEO	Partial evidence	Boston, MA, United StatesHQ checked Sep 14, 2026	11-50	6 contacts →
	Partial 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 14, 2026
16	Seralys	Partial evidence	Boston, United StatesHQ checked Sep 14, 2026	1-10	5 contacts →
	Partial evidence “Seralys is a boutique cybersecurity firm founded in 2012.” Source: RevenueBase Database · checked Sep 14, 2026
17	Hybridvalley	Indirect evidence	Boston, MA, United StatesHQ checked Sep 14, 2026	51-200	4 contacts →
	Indirect evidence “HybridValley is your technology consulting partner in all areas of information technology.” Source: RevenueBase Database · checked Sep 14, 2026
18	Buckley Technology Group, LLC	Indirect evidence	Boston, MA, United StatesHQ checked Sep 14, 2026	1-10	4 contacts →
	Indirect evidence “Since its inception in Buckley Technology Group (BTG) has been a leading provider of financial industry solutions - offering superior consulting, implementation, and support…” Source: RevenueBase Database · checked Sep 14, 2026
19	Infersight LLC	Indirect evidence	Boston, MA, United StatesHQ checked Sep 14, 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 14, 2026
20	Salt Cybersecurity	Partial evidence	Boston, MA, United StatesHQ checked Sep 14, 2026	11-50	4 contacts →
	Partial 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 14, 2026
21	Spherium Consulting Group	Partial evidence	Boston, MA, United StatesHQ checked Sep 14, 2026	1-10	4 contacts →
	Partial 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 14, 2026
22	Reverb Advisors	Indirect evidence	Boston, MA, United StatesHQ checked Sep 14, 2026	1-10	3 contacts →
	Indirect evidence “Reverb Advisors is an advisory firm that helps cyber security and data science companies achieve their entrepreneurial goals.” Source: RevenueBase Database · checked Sep 14, 2026
23	Cisomate	Indirect evidence	Boston, United StatesHQ checked Sep 14, 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 14, 2026
24	Arsenal Cyber Force	Partial evidence	Boston, MA, United StatesHQ checked Sep 14, 2026	1-10	2 contacts →
	Partial evidence “At Arsenal we are dedicated to delivering premier cybersecurity solutions, safeguarding our clients' digital landscapes.” Source: RevenueBase Database · checked Sep 14, 2026
25	Proassess	Partial evidence	Boston, MA, United StatesHQ checked Sep 14, 2026	1-10	2 contacts →
	Partial evidence “ProAssess is an easy-to-use cybersecurity risk management solution designed for small and mid-sized firms in all industries.” Source: RevenueBase Database · checked Sep 14, 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 61 cybersecurity startups based in Boston, United States

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Cybersecurity startups based in Boston, United States at a glance

As of Sep 14, 2026

47.8%Verified-email coverage

64.2Average contacts per company

11-50Median size (employees)

363.9%Largest-city concentration · New York

Sep 14, 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 61 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 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 Boston, 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 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, 1,871 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 14, 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

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 Boston, United States?

RevenueBase identified 61 cybersecurity startups 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 startups?

New York leads with 222 headquartered companies, followed by San Francisco (136) and Austin (129).

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 1,871 verified decision-maker contacts tracked across these 61 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 14, 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.