Company lists · Data refreshed September 2026

Top 24 Workplace security companies based in New York, United States

RevenueBase identified 131 workplace security companies headquartered in New York, United States as of September 2026 and tracks 5,054 professional contacts across them, including 408 with verified work emails. New York is the largest hub.

This list covers workplace security 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, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 14, 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 14, 2026 86% judged on-target in blind review
131Companies
5,054Contacts tracked
408Verified emails
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The 24 largest workplace security companies based in New York, United States

Ranked by team size
Top 24 of 131 workplace security companies based in New York, United States, ranked by team size, largest first. Data refreshed Sep 14, 2026. RevenueBase Smart Search rates how each company's information relates to workplace security companies: 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
1Partial evidenceNew York, NY, United StatesHQ checked Sep 14, 202610001+1,375 contacts →

Partial evidence

“Guardsmark, LLC provides security services.”

Source: RevenueBase Database · checked Sep 14, 2026
2Partial evidenceNew York, NY, United StatesHQ checked Sep 14, 2026501-1,000519 contacts →

Partial evidence

“Mulligan is a Manhattan-based provider of the finest security and fire safety professionals available.”

Source: RevenueBase Database · checked Sep 14, 2026
3Partial evidenceNew York, NY, United StatesHQ checked Sep 14, 2026501-1,000315 contacts →

Partial evidence

“Harvard Protection Services is one of the nation’s premier security firms.”

Source: RevenueBase Database · checked Sep 14, 2026
4Partial evidenceNew York, NY, United StatesHQ checked Sep 14, 2026201-500206 contacts →

Partial evidence

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

Source: RevenueBase Database · checked Sep 14, 2026
5Partial evidenceNew York, NY, United StatesHQ checked Sep 14, 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 14, 2026
6Partial evidenceNew York, NY, United StatesHQ checked Sep 14, 2026201-500129 contacts →

Partial evidence

“Founded in 1975, CSS Security, Inc.”

Source: RevenueBase Database · checked Sep 14, 2026
7Partial evidenceNew York, NY, United StatesHQ checked Sep 14, 2026501-1,000120 contacts →

Partial evidence

“Excel Security Corp.”

Source: RevenueBase Database · checked Sep 14, 2026
8Partial evidenceNew York, NY, United StatesHQ checked Sep 14, 202651-200110 contacts →

Partial evidence

“Allstar Security & Consulting is a full service, licensed, bonded and insured security services company.”

Source: RevenueBase Database · checked Sep 14, 2026
9Partial evidenceNew York, NY, United StatesHQ checked Sep 14, 2026201-500103 contacts →

Partial evidence

“Narrow Security provides Fire Guard Services and Security Guard Services across the US.”

Source: RevenueBase Database · checked Sep 14, 2026
10Partial evidenceNew York, United StatesHQ checked Sep 14, 2026501-1,00082 contacts →

Partial evidence

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

Source: RevenueBase Database · checked Sep 14, 2026
11Partial evidenceNew York, NY, United StatesHQ checked Sep 14, 20261,001-5,00082 contacts →

Partial evidence

Security USA®, Inc.”

Source: RevenueBase Database · checked Sep 14, 2026
12Partial evidenceNew York, NY, United StatesHQ checked Sep 14, 202611-5072 contacts →

Partial evidence

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

Source: RevenueBase Database · checked Sep 14, 2026
13Partial evidenceNew York, NY, United StatesHQ checked Sep 14, 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 14, 2026
14Partial evidenceNew York, NY, United StatesHQ checked Sep 14, 2026201-50068 contacts →

Partial evidence

“At CITY SAFE PARTNERS SECURITY, we create solutions and put systems in place to ensure that people and businesses are secure.”

Source: RevenueBase Database · checked Sep 14, 2026
15Partial evidenceNew York, NY, United StatesHQ checked Sep 14, 20261,001-5,00068 contacts →

Partial evidence

“We are among the few private security guard companies offering security guard services nationwide.”

Source: RevenueBase Database · checked Sep 14, 2026
16Partial evidenceNew York, NY, United StatesHQ checked Sep 14, 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 14, 2026
17Partial evidenceNew York, NY, United StatesHQ checked Sep 14, 2026201-50051 contacts →

Partial evidence

“CITADEL SECURITY AGENCY has been at the forefront of private security in New York City since 1981.”

Source: RevenueBase Database · checked Sep 14, 2026
18Indirect evidenceNew York, NY, United StatesHQ checked Sep 14, 202651-20036 contacts →

Indirect evidence

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

Source: RevenueBase Database · checked Sep 14, 2026
19Partial evidenceNew York, NY, United StatesHQ checked Sep 14, 202651-20036 contacts →

Partial evidence

SECURITY.”

Source: RevenueBase Database · checked Sep 14, 2026
20Indirect evidenceNew York, NY, United StatesHQ checked Sep 14, 202651-20035 contacts →

Indirect evidence

“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: RevenueBase Database · checked Sep 14, 2026
21Indirect evidenceNew York, NY, United StatesHQ checked Sep 14, 20261,001-5,00035 contacts →

Indirect evidence

“Quality Protection Services & Quality Building Services are certified Women Owned Business Enterprises.”

Source: RevenueBase Database · checked Sep 14, 2026
22Indirect evidenceNew York, NY, United StatesHQ checked Sep 14, 202651-20034 contacts →

Indirect evidence

“JC Protection wants to ensure peace of mind to our clients by providing the highest level of protection for their enterprise, their assets and the safety of their personnel.”

Source: RevenueBase Database · checked Sep 14, 2026
23Partial evidenceNew York, NY, United StatesHQ checked Sep 14, 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 14, 2026
24Partial evidenceNew York, NY, United StatesHQ checked Sep 14, 202611-5022 contacts →

Partial evidence

“Allstar Security provides high quality, professional security guard services to the nightlife, hospitality, retail and special event industries.”

Source: RevenueBase Database · checked Sep 14, 2026

Showing 24 of 131 workplace security companies based in New York, United States

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

As of Sep 14, 2026
8.1%Verified-email coverage
38.6Average contacts per company
11-50Median size (employees)
100.0%Largest-city concentration · New York
Sep 14, 2026Page data refreshed

Companies by employee count

1-10
29
11-50
48
51-200
25
201-500
14
501-1,000
8
1,001-5,000
5
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 131 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 workplace security companies, 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 “workplace security companies”. 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 workplace security companies), 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 workplace security 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 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, 408 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 14, 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 workplace security companies, 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 workplace security companies are there based in New York, United States?

RevenueBase identified 131 workplace security 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?

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

Which city has the most workplace security companies?

New York leads with 131 headquartered companies, followed by Los Angeles (119) and Houston (109).

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 408 verified decision-maker contacts tracked across these 131 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 14, 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.