Company lists · Data refreshed September 2026

Top 25 Enterprise security services based in New York, United States

RevenueBase identified 107 enterprise security services headquartered in New York, United States as of September 2026 and tracks 3,038 professional contacts across them, including 898 with verified work emails. New York is the largest hub.

This list covers enterprise security services 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, 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
107Companies
3,038Contacts tracked
898Verified emails
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The 25 largest enterprise security services based in New York, United States

Ranked by team size
Top 25 of 107 enterprise security services based in New York, United States, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to enterprise security services: 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.
#CompanyRevenueBase Smart SearchHeadquartersEmployeesContacts
1Indirect evidenceNew York, NY, United StatesHQ checked Sep 21, 202610001+571 contacts →

Indirect evidence

“Allied Universal Enhanced Protection Services delivers unrivaled threat mitigation expertise for government and business entities worldwide.”

Source: RevenueBase Database · checked Sep 21, 2026
2Indirect evidenceNew York, NY, United StatesHQ checked Sep 21, 2026201-500268 contacts →

Indirect evidence

“We stand at the forefront of leadership, insight, and guidance in a world marked by complexity and uncertainty.”

Source: RevenueBase Database · checked Sep 21, 2026
3Indirect evidenceNew York, NY, United StatesHQ checked Sep 21, 2026201-500265 contacts →

Indirect evidence

“Flashpoint is the leader in threat data and intelligence.”

Source: RevenueBase Database · checked Sep 21, 2026
4Indirect evidenceNew York, NY, United StatesHQ checked Sep 21, 2026201-500163 contacts →

Indirect evidence

“Harbor IT helps organizations secure, operate, and scale through integrated IT, cybersecurity, AI, and cloud services.”

Source: RevenueBase Database · checked Sep 21, 2026
5Partial evidenceNew York, NY, United StatesHQ checked Sep 21, 2026501-1,000159 contacts →

Partial evidence

“Silverseal is a comprehensive security solutions firm with worldwide affiliations that can provide global security services in a highly professional manner.”

Source: RevenueBase Database · checked Sep 21, 2026
6Indirect evidenceNew York, NY, United StatesHQ checked Sep 21, 202651-200125 contacts →

Indirect evidence

“Modern businesses run on millions of machine‑to‑machine connections: Autonomous AI Agents orchestrating work, CI/CD service accounts, SaaS OAuth apps, and API keys that keep data…”

Source: RevenueBase Database · checked Sep 21, 2026
7Partial evidenceNew York, NY, United StatesHQ checked Sep 21, 2026501-1,000120 contacts →

Partial evidence

“Excel Security Corp.”

Source: RevenueBase Database · checked Sep 21, 2026
8Indirect evidenceNew York, NY, United StatesHQ checked Sep 21, 202651-200104 contacts →

Indirect evidence

“We empower organizations with resilient, self-healing capabilities that prevent and neutralize even the most advanced cyber threats.”

Source: RevenueBase Database · checked Sep 21, 2026
9Indirect evidenceNew York, NY, United StatesHQ checked Sep 21, 202651-20076 contacts →

Indirect evidence

“NopalCyber makes cybersecurity manageable, affordable, reliable, and powerful for companies that need to be resilient and compliant.”

Source: RevenueBase Database · checked Sep 21, 2026
10Partial evidenceNew York, NY, United StatesHQ checked Sep 21, 2026201-50070 contacts →

Partial evidence

“At GLOBAL OPS, we specialize in creating and implementing tailored security solutions that cater to the unique needs of our diverse clientele.”

Source: RevenueBase Database · checked Sep 21, 2026
11Indirect evidenceNew York, NY, United StatesHQ checked Sep 21, 202651-20065 contacts →

Indirect evidence

“RevelSI is a global cybersecurity, AI, software, and infrastructure services organization.”

Source: RevenueBase Database · checked Sep 21, 2026
12Indirect evidenceNew York, NY, United StatesHQ checked Sep 21, 202651-20063 contacts →

Indirect evidence

“Effective risk management requires a holistic process.”

Source: RevenueBase Database · checked Sep 21, 2026
13Partial evidenceNew York, NY, United StatesHQ checked Sep 21, 20261,001-5,00060 contacts →

Partial evidence

“A&H Security Services, is a certified NYC MBE security services provider who makes a difference in our community.”

Source: RevenueBase Database · checked Sep 21, 2026
14Partial evidenceNew York, NY, United StatesHQ checked Sep 21, 202651-20055 contacts →

Partial evidence

“Port53 Technologies is The Global Leader in Cisco-Based Managed Security Operations, helping organizations modernize and secure their digital environments through advanced…”

Source: RevenueBase Database · checked Sep 21, 2026
15Partial evidenceNew York, NY, United StatesHQ checked Sep 21, 202651-20034 contacts →

Partial evidence

“Established in 2001, Zecurion has emerged as a worldwide authority in IT security solutions, safeguarding the interests of more than corporate clients spanning across 70+…”

Source: RevenueBase Database · checked Sep 21, 2026
16Partial evidenceNew York, NY, United StatesHQ checked Sep 21, 202611-5024 contacts →

Partial evidence

“We make it easy to deploy, configure, and manage key security tools like cross platform device management (MDM), endpoint detection and response (EDR), and more.”

Source: RevenueBase Database · checked Sep 21, 2026
17Indirect evidenceNew York, NY, United StatesHQ checked Sep 21, 202651-20023 contacts →

Indirect evidence

“Illusive was acquired by Proofpoint.”

Source: RevenueBase Database · checked Sep 21, 2026
18Partial evidenceNew York, NY, United StatesHQ checked Sep 21, 202611-5023 contacts →

Partial evidence

“Target Security Systems, LLC is New York City’s leading provider of cutting edge, high security solutions customized for today’s business and private sectors.”

Source: RevenueBase Database · checked Sep 21, 2026
19Indirect evidenceNew York, NY, United StatesHQ checked Sep 21, 202651-20021 contacts →

Indirect evidence

“Gotham Digital Science (GDS) was acquired in 2016 by Stroz Friedberg, an Aon company.”

Source: RevenueBase Database · checked Sep 21, 2026
20Partial evidenceNew York, NY, United StatesHQ checked Sep 21, 202611-5020 contacts →

Partial evidence

“Future-Ready Security for Today’s Decision-Makers.”

Source: RevenueBase Database · checked Sep 21, 2026
21Partial evidenceNew York, NY, United StatesHQ checked Sep 21, 202611-5018 contacts →

Partial evidence

“We help busy organizations provide maximum security with simple but sophisticated solutions which enable them to have everything under control.”

Source: RevenueBase Database · checked Sep 21, 2026
22Partial evidenceNew York, NY, United StatesHQ checked Sep 21, 202651-20017 contacts →

Partial evidence

“Cohere offers managed security and IT infrastructure services all under one roof.”

Source: RevenueBase Database · checked Sep 21, 2026
23Partial evidenceNew York, NY, United StatesHQ checked Sep 21, 202611-5016 contacts →

Partial evidence

“Unit 221B is a threat disruption company delivering actionable threat intelligence and cybersecurity solutions that enable enterprises, law enforcement, and government agencies to…”

Source: RevenueBase Database · checked Sep 21, 2026
24Partial evidenceNew York, United StatesHQ checked Sep 21, 20261-1013 contacts →

Partial evidence

“At SightWatch Security, we deliver proactive and trusted security solutions-from perimeter assessments to camera installation and real-time 24/7 monitoring.”

Source: RevenueBase Database · checked Sep 21, 2026
25Indirect evidenceNew York, United StatesHQ checked Sep 21, 202611-5012 contacts →

Indirect evidence

“We’re the nemesis of evil hackers attempting to take control of your system so they can extort money.”

Source: RevenueBase Database · checked Sep 21, 2026

Showing 25 of 107 enterprise security services based in New York, United States

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

As of Sep 21, 2026
29.6%Verified-email coverage
28.4Average contacts per company
11-50Median size (employees)
100.0%Largest-city concentration · New York
Sep 21, 2026Page data refreshed

Companies by employee count

1-10
36
11-50
36
51-200
19
201-500
8
501-1,000
4
1,001-5,000
3
10001+
1

Email recency for this list is measured across the whole United States list rather than for New York, so it is reported there. Company counts and contact totals on this page are exact for New York, over 107 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 enterprise security services, 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 New York, United States whose own description of what they do matches “enterprise security services”. 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 enterprise security services), 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 enterprise security services, 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 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, 898 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.

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 enterprise security services, 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 enterprise security services are there based in New York, United States?

RevenueBase identified 107 enterprise security services 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?

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

Which city has the most enterprise security services?

New York leads with 107 headquartered companies, followed by Houston (81) and Austin (61).

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 898 verified decision-maker contacts tracked across these 107 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.