Company lists · Data refreshed September 2026

Top 25 Managed security services companies based in New York, United States

Name: Managed security services companies based in New York, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 5, 2026 103 companies tracked

RevenueBase identified 103 managed security services companies headquartered in New York, United States as of September 2026 and tracks 3,182 professional contacts across them, including 1,140 with verified work emails. New York is the largest hub.

This list covers managed security services companies headquartered in New York, 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

103Companies

3,182Contacts tracked

1,140Verified emails

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The 25 largest managed security services companies based in New York, United States

Ranked by team size

Top 25 of 103 managed security services companies based in New York, 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 services companies: 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.
#	Company	Headquarters	Employees	Contacts
1	BluevoyantIndirect evidence	New York, NY, United StatesHQ checked Sep 5, 2026	501-1,000	683
	“BlueVoyant’s Cyber Defense Platform (CDP) integrates MDR, TPRM, and DRP into a seamless, scalable solution.” Source: company website · checked Sep 5, 2026
2	DGA SecurityPartial evidence	New York, NY, United StatesHQ checked Sep 5, 2026	201-500	206
	“Since 1969, thousands of businesses across the country have entrusted their protection to DGA Security.” Source: company website · checked Sep 5, 2026
3	Stroz Friedberg, A Levelblue CompanyStrong evidence	New York, NY, United StatesHQ checked Sep 5, 2026	501-1,000	206
	“Stroz Friedberg is now LevelBlue, the world's largest pure-play Managed Security Services Provider (MSSP).” Source: company website · checked Sep 5, 2026
4	AGIOPartial evidence	New York, NY, United StatesHQ checked Sep 5, 2026	201-500	200
	“Agio is a hybrid cybersecurity and managed IT organization that combines predictive intelligence with human brilliance to empower clients with next-generation cyber protection and…” Source: company website · checked Sep 5, 2026
5	Harbor ITIndirect evidence	New York, NY, United StatesHQ checked Sep 5, 2026	201-500	163
	“Harbor IT helps organizations secure, operate, and scale through integrated IT, cybersecurity, AI, and cloud services.” Source: company website · checked Sep 5, 2026
6	SilversealPartial evidence	New York, NY, United StatesHQ checked Sep 5, 2026	501-1,000	159
	“Silverseal is a comprehensive security solutions firm with worldwide affiliations that can provide global security services in a highly professional manner.” Source: company website · checked Sep 5, 2026
7	Excel Security CorporationPartial evidence	New York, NY, United StatesHQ checked Sep 5, 2026	501-1,000	120
	“Excel Security Corp.” Source: company website · checked Sep 5, 2026
8	Gmsc SecurityPartial evidence	New York, United StatesHQ checked Sep 5, 2026	501-1,000	82
	“For over 30 years GMSC has been securing high profile buildings and offices across New York and Chicago.” Source: company website · checked Sep 5, 2026
9	NopalcyberPartial evidence	New York, NY, United StatesHQ checked Sep 5, 2026	51-200	76
	“NopalCyber makes cybersecurity manageable, affordable, reliable, and powerful for companies that need to be resilient and compliant.” Source: company website · checked Sep 5, 2026
10	Black Birch GroupIndirect evidence	New York, NY, United StatesHQ checked Sep 5, 2026	51-200	65
	“Black Birch Group is a premier IT concierge and service provider, dedicated to delivering a comprehensive range of specialized solutions designed to meet the diverse needs of your…” Source: company website · checked Sep 5, 2026
11	A&h Security ServicesPartial evidence	New York, NY, United StatesHQ checked Sep 5, 2026	1,001-5,000	60
	“A&H Security Services, is a certified NYC MBE security services provider who makes a difference in our community.” Source: company website · checked Sep 5, 2026
12	BIG Idea TechnologyPartial evidence	New York, NY, United StatesHQ checked Sep 5, 2026	11-50	57
	“Big Idea Technology manages IT for small businesses headquartered in the New York City metropolitan area.” Source: company website · checked Sep 5, 2026
13	Port53Strong evidence	New York, NY, United StatesHQ checked Sep 5, 2026	51-200	55
	“Port53 Technologies is The Global Leader in Cisco-Based Managed Security Operations, helping organizations modernize and secure their digital environments through advanced…” Source: company website · checked Sep 5, 2026
14	Ciphertechs A Cybermaxx CompanyIndirect evidence	New York, United StatesHQ checked Sep 5, 2026	51-200	28
	“CipherTechs is now part of CyberMaxx, a tech-enabled cybersecurity service provider.” Source: company website · checked Sep 5, 2026
15	RiverstrongPartial evidence	New York, United StatesHQ checked Sep 5, 2026	11-50	25
	“Riverstrong - your trusted partner in IT and cybersecurity managed services.” Source: company website · checked Sep 5, 2026
16	NEW York Security Solutions INCPartial evidence	New York, NY, United StatesHQ checked Sep 5, 2026	11-50	20
	“Future-Ready Security for Today’s Decision-Makers.” Source: company website · checked Sep 5, 2026
17	Cohere Cyber SecureStrong evidence	New York, NY, United StatesHQ checked Sep 5, 2026	51-200	17
	“Cohere offers managed security and IT infrastructure services all under one roof.” Source: company website · checked Sep 5, 2026
18	Xperteks Computer Consultancy, INCIndirect evidence	New York, NY, United StatesHQ checked Sep 5, 2026	11-50	12
	Source: company website · checked Sep 5, 2026
19	CyberconvoyIndirect evidence	New York, United StatesHQ checked Sep 5, 2026	11-50	12
	“We’re the nemesis of evil hackers attempting to take control of your system so they can extort money.” Source: company website · checked Sep 5, 2026
20	Silent BreachIndirect evidence	New York, NY, United StatesHQ checked Sep 5, 2026	11-50	12
	“At Silent Breach, we think like a hacker and defend like a pro.” Source: company website · checked Sep 5, 2026
21	Analytica42Partial evidence	New York, NY, United StatesHQ checked Sep 5, 2026	11-50	11
	“Analytica42 isn’t just a service provider; we’re a trusted partner in your security operations.” Source: company website · checked Sep 5, 2026
22	SorbisPartial evidence	New York, NY, United StatesHQ checked Sep 5, 2026	11-50	9
	“Sorbis is a next-generation Managed Service Provider (MSP) helping hospitality and professional service firms modernize their IT, reduce costs, and stay secure.” Source: company website · checked Sep 5, 2026
23	BastionxIndirect evidence	New York, NY, United StatesHQ checked Sep 5, 2026	11-50	9
	“At BastionX, we revolutionize how businesses harness technology.” Source: company website · checked Sep 5, 2026
24	EMC IT SolutionsPartial evidence	New York, NY, United StatesHQ checked Sep 5, 2026	1-10	9
	“EMC IT Solutions is a Managed IT Services provider based in New York City, delivering secure, reliable, and scalable technology solutions to businesses nationwide.” Source: company website · checked Sep 5, 2026
25	White Hack LabsPartial evidence	New York, NY, United StatesHQ checked Sep 5, 2026	1-10	9
	“Our primary business is the digital security of your assets.” Source: company website · checked Sep 5, 2026

Showing 25 of 103 managed security services companies based in New York, United States

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Managed security services companies based in New York, United States at a glance

As of Sep 5, 2026

11-50Median size (employees)

New YorkLargest hub · 103 HQs

Contacts with mobile numbers

Sep 5, 2026Data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

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 New York, over 103 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 services companies, 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 New York, United States whose own description of what they do matches “managed security services companies”. 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 services companies, and records with no verified work email. Companies headquartered outside New York 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, 1,140 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 services companies by metro in the United States

Frequently asked

How many managed security services companies are there based in New York, United States?

RevenueBase identified 103 managed security services companies headquartered in New York, 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?

Bluevoyant, headquartered in New York, tops this list with the largest team on record.

Which city has the most managed security services companies?

New York leads with 103 headquartered companies, followed by Houston (85) and Miami (81).

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 1,140 verified decision-maker contacts tracked across these 103 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.