Company lists · Data refreshed September 2026

Top 25 Security consulting firms based in New York, United States

RevenueBase identified 189 security consulting firms headquartered in New York, United States as of September 2026 and tracks 4,961 professional contacts across them, including 1,050 with verified work emails. New York is the largest hub.

This list covers security consulting firms 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
189Companies
4,961Contacts tracked
1,050Verified emails
Explore all 189 companies → Free signup · no credit card · 500 free credits

The 25 largest security consulting firms based in New York, United States

Ranked by team size
Top 25 of 189 security consulting firms 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 consulting firms: 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
GuardsmarkPartial evidence
New York, NY, United StatesHQ checked Sep 6, 202610001+1,375

“Guardsmark, LLC provides security services.”

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
K2 IntegrityIndirect evidence
New York, NY, United StatesHQ checked Sep 6, 2026201-500311

“K2 Integrity is a global risk management company dedicated to helping organizations across both the public and private sectors protect their assets, reputation, and operations and…”

Source: company website · checked Sep 6, 2026
4
Guidepost SolutionsIndirect evidence
New York, NY, United StatesHQ checked Sep 6, 2026201-500268

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

Source: company website · checked Sep 6, 2026
5
T&m Usa, LLCPartial evidence
New York, NY, United StatesHQ checked Sep 6, 2026201-500216

“T&M USA provides seamlessly integrated executive protection, investigative and consulting services.”

Source: company website · checked Sep 6, 2026
6
Harbor ITIndirect evidence
New York, NY, United StatesHQ checked Sep 6, 2026201-500163

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

Source: company website · checked Sep 6, 2026
7
SilversealPartial evidence
New York, NY, United StatesHQ checked Sep 6, 2026501-1,000159

“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 6, 2026
8New York, NY, United StatesHQ checked Sep 6, 2026501-1,000120

“Excel Security Corp.”

Source: company website · checked Sep 6, 2026
9
AJ Squared SecurityPartial evidence
New York, NY, United StatesHQ checked Sep 6, 2026201-50082

“AJ Squared Security, Inc.(AJ2), is a privately owned security organization founded in May 2003 and incorporated in November 2003.”

Source: company website · checked Sep 6, 2026
10
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
11
Torchstone GlobalPartial evidence
New York, NY, United StatesHQ checked Sep 6, 202651-20077

“TorchStone is a discreet risk mitigation and security advisory firm serving the unique needs of the world’s leading organizations and individuals.”

Source: company website · checked Sep 6, 2026
12
Global OPSPartial evidence
New York, NY, United StatesHQ checked Sep 6, 2026201-50070

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

Source: company website · checked Sep 6, 2026
13
HubspireIndirect evidence
New York, NY, United StatesHQ checked Sep 6, 202611-5069

“HubSpire is an innovative team of management consultants, app developers, designers and digital transformation experts.”

Source: company website · checked Sep 6, 2026
14
City Safe PartnersPartial evidence
New York, NY, United StatesHQ checked Sep 6, 2026201-50068

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

Source: company website · checked Sep 6, 2026
15
Insite Risk ManagementIndirect evidence
New York, NY, United StatesHQ checked Sep 6, 202651-20063

“Effective risk management requires a holistic process.”

Source: company website · checked Sep 6, 2026
16
A&h Security ServicesPartial evidence
New York, NY, United StatesHQ checked Sep 6, 20261,001-5,00060

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

Source: company website · checked Sep 6, 2026
17
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
18
Vista InfosecPartial evidence
New York, NY, United StatesHQ checked Sep 6, 202651-20032

“VISTA InfoSec is a vendor-neutral company providing Risk Compliance and Information Security Advisory Services to organizations for the past 20 years (established in 2004).”

Source: company website · checked Sep 6, 2026
19New 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
20
SI Global PartnersStrong evidence
New York, NY, United StatesHQ checked Sep 6, 202611-5022

“SI Global Partners is an independent global investigation and security consulting firm founded in 2021.”

Source: company website · checked Sep 6, 2026
21
TAG InfosphereIndirect evidence
New York, NY, United StatesHQ checked Sep 6, 202611-5022

“TAG serves the cybersecurity community, primarily with enterprise, vendors, and venture capital.”

Source: company website · checked Sep 6, 2026
22New York, NY, United StatesHQ checked Sep 6, 202651-20021

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

Source: company website · checked Sep 6, 2026
23New York, NY, United StatesHQ checked Sep 6, 202611-5020

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

Source: company website · checked Sep 6, 2026
24
Global Data Risk LLCPartial evidence
New York, NY, United StatesHQ checked Sep 6, 202651-20020

“Founded in 2022 and headquartered in the historic financial core of New York, Global Data Risk LLC (GDR) is an independent investigative consulting firm focused on risk in the…”

Source: company website · checked Sep 6, 2026
25
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

Showing 25 of 189 security consulting firms based in New York, United States

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Security consulting firms based in New York, United States at a glance

As of Sep 6, 2026
11-50Median size (employees)
New YorkLargest hub · 189 HQs
Contacts with mobile numbers
Sep 6, 2026Data refreshed

Companies by employee count

1-10
75
11-50
58
51-200
30
201-500
15
501-1,000
5
1,001-5,000
4
10001+
2

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 189 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 consulting firms, 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 consulting firms”. 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 consulting firms, 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, 1,050 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.

Security consulting firms by metro in the United States

Frequently asked

How many security consulting firms are there based in New York, United States?

RevenueBase identified 189 security consulting firms 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 security consulting firms?

New York leads with 189 headquartered companies, followed by Washington (139) and Houston (124).

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 1,050 verified decision-maker contacts tracked across these 189 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.