Company lists · Data refreshed September 2026

Top 24 Security monitoring services based in New York, United States

RevenueBase identified 116 security monitoring services headquartered in New York, United States as of September 2026 and tracks 3,257 professional contacts across them, including 1,193 with verified work emails. New York is the largest hub.

This list covers security monitoring 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, how directly it supports the match, and when it was last checked. Data refreshed September 6, 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 6, 2026 86% judged on-target in blind review
116Companies
3,257Contacts tracked
1,193Verified emails
Explore all 116 companies → Free signup · no credit card · 500 free credits

The 24 largest security monitoring services based in New York, United States

Ranked by team size
Top 24 of 116 security monitoring services based in New York, United States, ranked by team size, largest first. Data refreshed Sep 6, 2026. Evidence rates how directly each company's own description names security monitoring services: 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
BluevoyantIndirect evidence
New York, NY, United StatesHQ checked Sep 6, 2026501-1,000683

“BlueVoyant’s Cyber Defense Platform (CDP) integrates MDR, TPRM, and DRP into a seamless, scalable solution.”

Source: company website · checked Sep 6, 2026
2
MSA SecurityIndirect evidence
New York, NY, United StatesHQ checked Sep 6, 202610001+571

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

Source: company website · checked Sep 6, 2026
3
FlashpointIndirect evidence
New York, NY, United StatesHQ checked Sep 6, 2026201-500265

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

Source: company website · checked Sep 6, 2026
4
DGA SecurityPartial evidence
New York, NY, United StatesHQ checked Sep 6, 2026201-500206

“Since 1969, thousands of businesses across the country have entrusted their protection to DGA Security.”

Source: company website · checked Sep 6, 2026
5
AGIOIndirect evidence
New York, NY, United StatesHQ checked Sep 6, 2026201-500200

“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 6, 2026
6New York, NY, United StatesHQ checked Sep 6, 2026501-1,000120

“Excel Security Corp.”

Source: company website · checked Sep 6, 2026
7
Gmsc SecurityPartial evidence
New York, United StatesHQ checked Sep 6, 2026501-1,00082

“For over 30 years GMSC has been securing high profile buildings and offices across New York and Chicago.”

Source: company website · checked Sep 6, 2026
8
Security USA INCPartial evidence
New York, NY, United StatesHQ checked Sep 6, 20261,001-5,00082

Security USA®, Inc.”

Source: company website · checked Sep 6, 2026
9
NopalcyberIndirect evidence
New York, NY, United StatesHQ checked Sep 6, 202651-20076

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

Source: company website · checked Sep 6, 2026
10
ADR SecurityPartial evidence
New York, NY, United StatesHQ checked Sep 6, 202611-5072

“ADR Security is the leading provider of electronic and physical security services to some of New York's largest residential real estate portfolios.”

Source: company website · checked Sep 6, 2026
11
Port53Partial evidence
New York, NY, United StatesHQ checked Sep 6, 202651-20055

“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 6, 2026
12
OHZ Remote GuardingIndirect evidence
New York, NY, United StatesHQ checked Sep 6, 202651-20036

“OHZ is America’s way to secure and save.”

Source: company website · checked Sep 6, 2026
13
Monitex SecurityPartial evidence
New York, NY, United StatesHQ checked Sep 6, 202651-20035

“Your property secured 24/7 Our services: Construction Site Monitoring: Use real time, Live video surveillance to Prevent property damage, equipment theft, and injury liability…”

Source: company website · checked Sep 6, 2026
14New York, United StatesHQ checked Sep 6, 202651-20028

“CipherTechs is now part of CyberMaxx, a tech-enabled cybersecurity service provider.”

Source: company website · checked Sep 6, 2026
15
Target Security SystemsPartial evidence
New York, NY, United StatesHQ checked Sep 6, 202611-5023

“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: company website · checked Sep 6, 2026
16
ACA AponixIndirect evidence
New York, NY, United StatesHQ checked Sep 6, 2026201-50019

“ACA Aponix, a division of ACA Group, provides cybersecurity and technology risk assessments, vendor and M&A diligence services, network testing, and advisory services.”

Source: company website · checked Sep 6, 2026
17
Vertex Security SystemsPartial evidence
New York, NY, United StatesHQ checked Sep 6, 202611-5018

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

Source: company website · checked Sep 6, 2026
18
Cohere Cyber SecurePartial evidence
New York, NY, United StatesHQ checked Sep 6, 202651-20017

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

Source: company website · checked Sep 6, 2026
19New York, NY, United StatesHQ checked Sep 6, 2026201-50017

“IntSights delivers best-in-class, cloud-native external threat detection to further extend Rapid7’s industry-leading security operations platform, providing customers with…”

Source: company website · checked Sep 6, 2026
20
Unit 221bIndirect evidence
New York, NY, United StatesHQ checked Sep 6, 202611-5016

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

Source: company website · checked Sep 6, 2026
21
Sight Watch SecurityStrong evidence
New York, United StatesHQ checked Sep 6, 20261-1013

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

Source: company website · checked Sep 6, 2026
22
CyberconvoyIndirect evidence
New York, United StatesHQ checked Sep 6, 202611-5012

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

Source: company website · checked Sep 6, 2026
23
Silent BreachIndirect evidence
New York, NY, United StatesHQ checked Sep 6, 202611-5012

“At Silent Breach, we think like a hacker and defend like a pro.”

Source: company website · checked Sep 6, 2026
24
Analytica42Partial evidence
New York, NY, United StatesHQ checked Sep 6, 202611-5011

“Analytica42 isn’t just a service provider; we’re a trusted partner in your security operations.”

Source: company website · checked Sep 6, 2026

Showing 24 of 116 security monitoring services based in New York, United States

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Security monitoring services based in New York, United States at a glance

As of Sep 6, 2026
11-50Median size (employees)
New YorkLargest hub · 116 HQs
Contacts with mobile numbers
Sep 6, 2026Data refreshed

Companies by employee count

1-10
39
11-50
39
51-200
20
201-500
9
501-1,000
5
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 New York, over 116 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 security monitoring services, 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 “security monitoring services”. 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 security monitoring 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 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, 1,193 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 6, 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

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

RevenueBase identified 116 security monitoring 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?

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

Which city has the most security monitoring services?

New York leads with 116 headquartered companies, followed by Miami (82) and Houston (79).

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 1,193 verified decision-maker contacts tracked across these 116 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 6, 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.