Company lists · Data refreshed September 2026

Top 24 Security consulting companies based in New York, United States

Name: Security consulting 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 6, 2026 131 companies tracked

RevenueBase identified 131 security consulting companies headquartered in New York, United States as of September 2026 and tracks 4,236 professional contacts across them, including 894 with verified work emails. New York is the largest hub.

This list covers security consulting 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 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

131Companies

4,236Contacts tracked

894Verified emails

Explore all 131 companies → Free signup · no credit card · 500 free credits

The 24 largest security consulting companies based in New York, United States

Ranked by team size

Top 24 of 131 security consulting companies 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 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	GuardsmarkPartial evidence	New York, NY, United StatesHQ checked Sep 6, 2026	10001+	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, 2026	10001+	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, 2026	201-500	311
	“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, 2026	201-500	268
	“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, 2026	201-500	216
	“T&M USA provides seamlessly integrated executive protection, investigative and consulting services.” Source: company website · checked Sep 6, 2026
6	SilversealPartial evidence	New York, NY, United StatesHQ checked Sep 6, 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 6, 2026
7	Excel Security CorporationPartial evidence	New York, NY, United StatesHQ checked Sep 6, 2026	501-1,000	120
	“Excel Security Corp.” Source: company website · checked Sep 6, 2026
8	Gmsc SecurityPartial evidence	New York, United StatesHQ checked Sep 6, 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 6, 2026
9	Torchstone GlobalPartial evidence	New York, NY, United StatesHQ checked Sep 6, 2026	51-200	77
	“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
10	Global OPSPartial evidence	New York, NY, United StatesHQ checked Sep 6, 2026	201-500	70
	“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
11	Insite Risk ManagementIndirect evidence	New York, NY, United StatesHQ checked Sep 6, 2026	51-200	63
	“Effective risk management requires a holistic process.” Source: company website · checked Sep 6, 2026
12	Port53Partial evidence	New York, NY, United StatesHQ checked Sep 6, 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 6, 2026
13	OSECPartial evidence	New York, NY, United StatesHQ checked Sep 6, 2026	11-50	38
	“We're the security consultants Fortune 500s call when they're in real trouble, the ones who find what others miss, who speak CEO and CISO fluently.” Source: company website · checked Sep 6, 2026
14	Ciphertechs A Cybermaxx CompanyIndirect evidence	New York, United StatesHQ checked Sep 6, 2026	51-200	28
	“CipherTechs is now part of CyberMaxx, a tech-enabled cybersecurity service provider.” Source: company website · checked Sep 6, 2026
15	Gotham Digital Science, A Stroz Friedberg CompanyIndirect evidence	New York, NY, United StatesHQ checked Sep 6, 2026	51-200	21
	“Gotham Digital Science (GDS) was acquired in 2016 by Stroz Friedberg, an Aon company.” Source: company website · checked Sep 6, 2026
16	Global Data Risk LLCPartial evidence	New York, NY, United StatesHQ checked Sep 6, 2026	51-200	20
	“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
17	ACA AponixIndirect evidence	New York, NY, United StatesHQ checked Sep 6, 2026	201-500	19
	“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
18	Ddcues LLCPartial evidence	New York, United StatesHQ checked Sep 6, 2026	51-200	18
	“DDCues is a national risk management firm committed to protecting people, securing infrastructure, and defending the Nation.” Source: company website · checked Sep 6, 2026
19	Narrowgate Security AgencyPartial evidence	New York, United StatesHQ checked Sep 6, 2026	1,001-5,000	18
	“We provide analysis and design of Physical Security Systems (PSS) of high risk facilities and critical infrastructure.” Source: company website · checked Sep 6, 2026
20	SpherenyPartial evidence	New York, NY, United StatesHQ checked Sep 6, 2026	11-50	14
	“SphereNY is made up of seasoned professionals who have a passion for the Construction Industry and Security Awareness programs for all sectors.” Source: company website · checked Sep 6, 2026
21	Ia-Tech CenterPartial evidence	New York, NY, United StatesHQ checked Sep 6, 2026	11-50	14
	“IA-TechCenter is a leading IT- Consulting firm composed of experts specializing in Program, and Project Management Services.” Source: company website · checked Sep 6, 2026
22	RGS Global AdvisorsIndirect evidence	New York, NY, United StatesHQ checked Sep 6, 2026	11-50	11
	“Top notch services at reasonable cost RGS Global Advisors has a wealth of internal audit, FDICIA and SOX testing, remediation, consultancy, BSA/AML/OFAC, IT/IS/Cybersecurity &…” Source: company website · checked Sep 6, 2026
23	International Crisis Management Group IcmgPartial evidence	New York, NY, United StatesHQ checked Sep 6, 2026	11-50	10
	“ICMG delivers strategic security and risk management solutions grounded in cross-sector collaboration and a deep understanding of global security challenges.” Source: company website · checked Sep 6, 2026
24	Roundtable Solutions SecurityIndirect evidence	New York, NY, United StatesHQ checked Sep 6, 2026	51-200	10
	“Founded in New York City in 1991, Roundtable Solutions has developed a reputation for providing clients with exceptional service, commensurate with risk, and therefore the perfect…” Source: company website · checked Sep 6, 2026

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

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 894 reachable decision-makers.

Free signup · no credit card

See all 131 companies

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

As of Sep 6, 2026

11-50Median size (employees)

New YorkLargest hub · 131 HQs

Contacts with mobile numbers

Sep 6, 2026Data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

10001+

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 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 security consulting 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 “security consulting 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 security consulting 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, 894 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 companies by metro in the United States

Frequently asked

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

RevenueBase identified 131 security consulting 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 security consulting companies?

New York leads with 131 headquartered companies, followed by Houston (93) and Atlanta (89).

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 894 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 6, 2026.

Ready to reach these companies? Verified emails and direct dials for all 131 security consulting companies based in New York, United States. Start with a free account, no credit card.

Get the full list

Related lists

Security consulting companies by geography

Browse the directory

Browse: Companies home · Security consulting companies in United States · All United States lists · All Security consulting companies lists · New lists

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.