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.
The 23 largest managed security service providers based in Boston, United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | Rapid7Partial evidence | 2,822 | |||
“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, 2026Thanks. The Data Team will review it. | |||||
| 2 | 752 | ||||
“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, 2026Thanks. The Data Team will review it. | |||||
| 3 | 387 | ||||
“Continuum, a ConnectWise company, is the proactive platform for what’s next.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 4 | 327 | ||||
“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, 2026Thanks. The Data Team will review it. | |||||
| 5 | 309 | ||||
“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, 2026Thanks. The Data Team will review it. | |||||
| 6 | 57 | ||||
“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, 2026Thanks. The Data Team will review it. | |||||
| 7 | TracelayIndirect evidence | 51 | |||
“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, 2026Thanks. The Data Team will review it. | |||||
| 8 | 31 | ||||
“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, 2026Thanks. The Data Team will review it. | |||||
| 9 | 22 | ||||
“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, 2026Thanks. The Data Team will review it. | |||||
| 10 | 18 | ||||
“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, 2026Thanks. The Data Team will review it. | |||||
| 11 | 14 | ||||
“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, 2026Thanks. The Data Team will review it. | |||||
| 12 | ProinfIndirect evidence | 14 | |||
“Proinf is a complete suite of Cybersecurity and Professional Services Provider.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 13 | 13 | ||||
“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, 2026Thanks. The Data Team will review it. | |||||
| 14 | Vault AmericaPartial evidence | 7 | |||
“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, 2026Thanks. The Data Team will review it. | |||||
| 15 | RedsenseIndirect evidence | 6 | |||
“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, 2026Thanks. The Data Team will review it. | |||||
| 16 | SeralysIndirect evidence | 5 | |||
“Seralys is a boutique cybersecurity firm founded in 2012.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 17 | 4 | ||||
“HybridValley is your technology consulting partner in all areas of information technology.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 18 | 4 | ||||
“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, 2026Thanks. The Data Team will review it. | |||||
| 19 | 4 | ||||
“InferSight is one of the top trusted cyber security solutions partners in the industry.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 20 | Spherium Consulting GroupIndirect evidence | 4 | |||
“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, 2026Thanks. The Data Team will review it. | |||||
| 21 | 2 | ||||
“At Arsenal we are dedicated to delivering premier cybersecurity solutions, safeguarding our clients' digital landscapes.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 22 | 1 | ||||
“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, 2026Thanks. The Data Team will review it. | |||||
| 23 | 1 | ||||
“Santsec's approach to cybersecurity leverages a blend of real-world experience and cutting-edge technology.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
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, 2026Companies by employee count
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
- Managed security service providers in New York200
- Managed security service providers in Houston120
- Managed security service providers in Austin117
- Managed security service providers in Atlanta114
- Managed security service providers in Washington107
- Managed security service providers in Miami106
- Managed security service providers in Chicago100
- Managed security service providers in Dallas100
- Managed security service providers in Tampa94
- Managed security service providers in San Francisco86
- Managed security service providers in Charlotte61
- Managed security service providers in Los Angeles60
- Managed security service providers in Columbia56
- Managed security service providers in Arlington54
- Managed security service providers in San Diego53
- Managed security service providers in Denver52
- Managed security service providers in Orlando52
- Managed security service providers in Boston51
- Managed security service providers in Las Vegas51
- Managed security service providers in San Antonio48
- Managed security service providers in Phoenix47
- Managed security service providers in Seattle39
- Managed security service providers in Reston38
- Managed security service providers in Wilmington38
- Managed security service providers in Alexandria37
- Managed security service providers in Irvine36
- Managed security service providers in Mclean36
- Managed security service providers in Sheridan36
- Managed security service providers in Fairfax34
- Managed security service providers in Raleigh33
- Managed security service providers in Huntsville32
- Managed security service providers in Portland32
- Managed security service providers in San Jose31
- Managed security service providers in Baltimore30
- Managed security service providers in Pittsburgh30
- Managed security service providers in Scottsdale30
- Managed security service providers in Plano29
- Managed security service providers in Fort Lauderdale28
- Managed security service providers in Colorado Springs27
- Managed security service providers in Ashburn26
- Managed security service providers in Dover26
- Managed security service providers in Richmond25
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.
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