Company lists · Data refreshed September 2026

Top 23 Managed security service providers based in Boston, United States

RevenueBase identified 51 managed security service providers headquartered in Boston, United States as of September 2026 and tracks 5,001 professional contacts across them, including 2,083 with verified work emails. New York is the largest hub.

This list covers managed security service providers 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, how directly it supports the match, and when it was last checked. Data refreshed September 5, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 Match evidence on every row Refreshed Sep 5, 2026 86% judged on-target in blind review
51Companies
5,001Contacts tracked
2,083Verified emails
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The 23 largest managed security service providers based in Boston, United States

Ranked by team size
Top 23 of 51 managed security service providers based in Boston, United States, ranked by team size, largest first. Data refreshed Sep 5, 2026. Evidence rates how directly each company's own description names managed security service providers: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#CompanyHeadquartersEmployeesContacts
1
Rapid7Partial evidence
Boston, MA, United StatesHQ checked Sep 5, 20261,001-5,0002,822

“Rapid7, Inc.(NASDAQ: RPD) is a global leader in AI-powered managed cybersecurity operations, trusted to advance organizations’ cyber resilience.”

Source: company website · checked Sep 5, 2026
2
BitsightIndirect evidence
Boston, MA, United StatesHQ checked Sep 5, 2026501-1,000752

“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: company website · checked Sep 5, 2026
3
ContinuumIndirect evidence
Boston, MA, United StatesHQ checked Sep 5, 20261,001-5,000387

“Continuum, a ConnectWise company, is the proactive platform for what’s next.”

Source: company website · checked Sep 5, 2026
4
IANSPartial evidence
Boston, MA, United StatesHQ checked Sep 5, 202651-200327

“For the security practitioner caught between rapidly evolving threats and demanding executives, IANS Research is a clear-headed resource for decision-making and articulating risk.”

Source: company website · checked Sep 5, 2026
5
Cynet SecurityPartial evidence
Boston, MA, United StatesHQ checked Sep 5, 2026201-500309

“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: company website · checked Sep 5, 2026
6
EIQ NetworksPartial evidence
Boston, MA, United StatesHQ checked Sep 5, 202651-20057

“EiQ, a pioneer in hybrid security as a service, is transforming how mid-market organizations build enterprise-class security programs.”

Source: company website · checked Sep 5, 2026
7
TracelayIndirect evidence
Boston, MA, United StatesHQ checked Sep 5, 202611-5051

“Founded by elite cybersecurity entrepreneurs in collaboration with partners with expertise in the intelligence community, Tracelay brings together global expertise and…”

Source: company website · checked Sep 5, 2026
8
Abusix, INCPartial evidence
Boston, MA, United StatesHQ checked Sep 5, 202611-5031

“At Abusix, we empower businesses, ISPs, and email service providers with cutting-edge security solutions to safeguard digital infrastructure.”

Source: company website · checked Sep 5, 2026
9
FreezeIndirect evidence
Boston, MA, United StatesHQ checked Sep 5, 202611-5022

“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: company website · checked Sep 5, 2026
10Boston, MA, United StatesHQ checked Sep 5, 20261-1018

“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: company website · checked Sep 5, 2026
11
AceliumIndirect evidence
Boston, United StatesHQ checked Sep 5, 202651-20014

“Is a cybersecurity engineering company that delivers live operational and executive oversight of IT infrastructure and cybersecurity posture to enterprise customers globally.”

Source: company website · checked Sep 5, 2026
12
ProinfIndirect evidence
Boston, MA, United StatesHQ checked Sep 5, 202651-20014

“Proinf is a complete suite of Cybersecurity and Professional Services Provider.”

Source: company website · checked Sep 5, 2026
13
EOS SystemsPartial evidence
Boston, MA, United StatesHQ checked Sep 5, 202611-5013

“Eos Systems, a leader in cyber security and technology delivery services, has been helping clients solve complex technology challenges for over 25 years.”

Source: company website · checked Sep 5, 2026
14
Vault AmericaPartial evidence
Boston, MA, United StatesHQ checked Sep 5, 20261-107

“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: company website · checked Sep 5, 2026
15
RedsenseIndirect evidence
Boston, MA, United StatesHQ checked Sep 5, 202611-506

“RedSense provides industry-leading intelligence services, adversary space interaction & monitoring, net flow monitoring and interpretation, and the development of custom threat…”

Source: company website · checked Sep 5, 2026
16
SeralysIndirect evidence
Boston, United StatesHQ checked Sep 5, 20261-105

“Seralys is a boutique cybersecurity firm founded in 2012.”

Source: company website · checked Sep 5, 2026
17
HybridvalleyIndirect evidence
Boston, MA, United StatesHQ checked Sep 5, 202651-2004

“HybridValley is your technology consulting partner in all areas of information technology.”

Source: company website · checked Sep 5, 2026
18
Salt CybersecurityPartial evidence
Boston, MA, United StatesHQ checked Sep 5, 202611-504

“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: company website · checked Sep 5, 2026
19
Infersight LLCPartial evidence
Boston, MA, United StatesHQ checked Sep 5, 202611-504

“InferSight is one of the top trusted cyber security solutions partners in the industry.”

Source: company website · checked Sep 5, 2026
20
Spherium Consulting GroupIndirect evidence
Boston, MA, United StatesHQ checked Sep 5, 20261-104

“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: company website · checked Sep 5, 2026
21
Arsenal Cyber ForceIndirect evidence
Boston, MA, United StatesHQ checked Sep 5, 20261-102

“At Arsenal we are dedicated to delivering premier cybersecurity solutions, safeguarding our clients' digital landscapes.”

Source: company website · checked Sep 5, 2026
22
QuantumstrikePartial evidence
Boston, MA, United StatesHQ checked Sep 5, 2026201-5001

“A global interdisciplinary analytics-driven and human-focused cybersecurity company which delivers innovative security solutions that ensure companies do what they do best -…”

Source: company website · checked Sep 5, 2026
23
SantsecIndirect evidence
Boston, MA, United StatesHQ checked Sep 5, 20261-101

“Santsec's approach to cybersecurity leverages a blend of real-world experience and cutting-edge technology.”

Source: company website · checked Sep 5, 2026

Showing 23 of 51 managed security service providers based in Boston, United States

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Managed security service providers based in Boston, United States at a glance

As of Sep 5, 2026
11-50Median size (employees)
New YorkLargest hub · 200 HQs
Contacts with mobile numbers
Sep 5, 2026Data refreshed

Companies by employee count

1-10
23
11-50
15
51-200
6
201-500
2
501-1,000
2
1,001-5,000
2
10001+
1

Email recency for this list is measured across the whole United States list rather than this city, so it is reported there. Company counts and contact totals on this page are exact for Boston, over 51 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 managed security service providers, so some rows will be adjacent to the category rather than pure plays. The description and evidence 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 SmartSearch, 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 “managed security service providers”. Matching reads each company's description, not its industry code or its name.
What we exclude
Companies whose own description does not clearly place them among managed security service providers, 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 an evidence 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, 2,083 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 5, 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.

Managed security service providers by metro in the United States

Frequently asked

How many managed security service providers are there based in Boston, United States?

RevenueBase identified 51 managed security service providers 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 managed security service providers?

New York leads with 200 headquartered companies, followed by Houston (120) and Austin (117).

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 2,083 verified decision-maker contacts tracked across these 51 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 5, 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 SmartSearch, 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.