Company lists · Data refreshed September 2026

Top 25 Cybersecurity specialists based in New York, United States

Name: Cybersecurity specialists 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 21, 2026 125 companies tracked

RevenueBase identified 125 cybersecurity specialists headquartered in New York, United States as of September 2026 and tracks 2,954 professional contacts across them, including 994 with verified work emails. New York is the largest hub.

This list covers cybersecurity specialists 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

125Companies

2,954Contacts tracked

994Verified emails

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The 25 largest cybersecurity specialists based in New York, United States

Ranked by team size

Top 25 of 125 cybersecurity specialists 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 cybersecurity specialists: 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.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Offsec	Partial evidence	New York, NY, United StatesHQ checked Sep 21, 2026	201-500	879 contacts →
	Partial evidence “Empowering the world to fight cyber threats with indispensable cybersecurity skills and resources.” Source: RevenueBase Database · checked Sep 21, 2026
2	Bluevoyant	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 2026	501-1,000	683 contacts →
	Indirect evidence “BlueVoyant’s Cyber Defense Platform (CDP) integrates MDR, TPRM, and DRP into a seamless, scalable solution.” Source: RevenueBase Database · checked Sep 21, 2026
3	AGIO	Partial evidence	New York, NY, United StatesHQ checked Sep 21, 2026	201-500	200 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 21, 2026
4	Harbor IT	Partial evidence	New York, NY, United StatesHQ checked Sep 21, 2026	201-500	163 contacts →
	Partial evidence “Harbor IT helps organizations secure, operate, and scale through integrated IT, cybersecurity, AI, and cloud services.” Source: RevenueBase Database · checked Sep 21, 2026
5	Morphisec	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 2026	51-200	104 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
6	Nopalcyber	Partial evidence	New York, NY, United StatesHQ checked Sep 21, 2026	51-200	76 contacts →
	Partial 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
7	Eretmis INC	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 2026	n/a	66 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 21, 2026
8	Revelsi	Partial evidence	New York, NY, United StatesHQ checked Sep 21, 2026	51-200	65 contacts →
	Partial evidence “RevelSI is a global cybersecurity, AI, software, and infrastructure services organization.” Source: RevenueBase Database · checked Sep 21, 2026
9	Altourage	Partial evidence	New York, NY, United StatesHQ checked Sep 21, 2026	51-200	58 contacts →
	Partial evidence “Altourage is a New York City-based managed IT and cybersecurity provider built for organizations that operate in high-stakes, fast-moving environments.” Source: RevenueBase Database · checked Sep 21, 2026
10	Nsknox	Partial evidence	New York, NY, United StatesHQ checked Sep 21, 2026	11-50	57 contacts →
	Partial evidence “nsKnox is a cybersecurity company focused on Corporate Payment Security, founded and led by Alon Cohen, Founder & former CEO of CyberArk (NASDAQ: CYBR).” Source: RevenueBase Database · checked Sep 21, 2026
11	Port53	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 2026	51-200	55 contacts →
	Indirect 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
12	Proven Data	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 2026	11-50	38 contacts →
	Indirect evidence “Founded in 2011, Proven Data has consistently evolved to meet the growing needs of our clients.” Source: RevenueBase Database · checked Sep 21, 2026
13	Ciphertechs A Cybermaxx Company	Partial evidence	New York, United StatesHQ checked Sep 21, 2026	51-200	28 contacts →
	Partial evidence “CipherTechs is now part of CyberMaxx, a tech-enabled cybersecurity service provider.” Source: RevenueBase Database · checked Sep 21, 2026
14	ACA Aponix	Partial evidence	New York, NY, United StatesHQ checked Sep 21, 2026	201-500	19 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 21, 2026
15	Unit 221b	Partial evidence	New York, NY, United StatesHQ checked Sep 21, 2026	11-50	16 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
16	Lifars, LLC	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 2026	11-50	16 contacts →
	Indirect evidence “LIFARS, a SecurityScorecard Company is a global leader in Incident Response, Digital Forensics, Ransomware Mitigation, and Cyber Resiliency services.” Source: RevenueBase Database · checked Sep 21, 2026
17	Aphinia	Partial evidence	New York, United StatesHQ checked Sep 21, 2026	201-500	13 contacts →
	Partial evidence “Aphinia is a private community of 1,500+ CISOs and other senior cybersecurity executives, coming together to learn from each other, to help each other and to keep their…” Source: RevenueBase Database · checked Sep 21, 2026
18	Cyberconvoy	Indirect evidence	New York, United StatesHQ checked Sep 21, 2026	11-50	12 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
19	Silent Breach	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 2026	11-50	12 contacts →
	Indirect evidence “At Silent Breach, we think like a hacker and defend like a pro.” Source: RevenueBase Database · checked Sep 21, 2026
20	Analytica42	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 2026	11-50	11 contacts →
	Indirect evidence “Analytica42 isn’t just a service provider; we’re a trusted partner in your security operations.” Source: RevenueBase Database · checked Sep 21, 2026
21	Techgardens	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 2026	11-50	9 contacts →
	Indirect evidence “Techgardens is a systems integrator founded in 2009 and based in New York.” Source: RevenueBase Database · checked Sep 21, 2026
22	White Hack Labs	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 2026	1-10	9 contacts →
	Indirect evidence “Our primary business is the digital security of your assets.” Source: RevenueBase Database · checked Sep 21, 2026
23	Resonance Security	Partial evidence	New York, NY, United StatesHQ checked Sep 21, 2026	11-50	9 contacts →
	Partial evidence “Resonance Security offers full spectrum cybersecurity aggregation software for institutions and individuals that makes protecting against any cybersecurity threat effortless no…” Source: RevenueBase Database · checked Sep 21, 2026
24	Seaglass Technology, LLC	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 2026	11-50	8 contacts →
	Indirect evidence “At SeaGlass Technology we specialize using our proprietary methodology and processes developed from our VCISO team and experienced tech teams approach to managing Hedge Funds IT &…” Source: RevenueBase Database · checked Sep 21, 2026
25	Sayfer Cyber Security	Indirect evidence	New York, United StatesHQ checked Sep 21, 2026	11-50	8 contacts →
	Indirect evidence “Sayfer, where people and technology meet to overcome web3 and blockchain challenges.” Source: RevenueBase Database · checked Sep 21, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: cybersecurity specialists. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names cybersecurity specialists.
Partial evidence: Its own public description names part of cybersecurity specialists, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name cybersecurity specialists. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 125 cybersecurity specialists based in New York, United States

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Cybersecurity specialists based in New York, United States at a glance

As of Sep 21, 2026

33.6%Verified-email coverage

23.6Average 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

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 for New York, so it is reported there. Company counts and contact totals on this page are exact for New York, over 125 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 cybersecurity specialists, 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 “cybersecurity specialists”. 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 cybersecurity specialists), 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 cybersecurity specialists, 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, 994 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.

Cybersecurity specialists by metro in the United States

Cybersecurity specialists in New York125
Cybersecurity specialists in Houston83
Cybersecurity specialists in Atlanta81
Cybersecurity specialists in Washington80
Cybersecurity specialists in Dallas75
Cybersecurity specialists in Austin73
Cybersecurity specialists in Miami73
Cybersecurity specialists in Chicago67
Cybersecurity specialists in Tampa57
Cybersecurity specialists in San Francisco50
Cybersecurity specialists in Columbia47
Cybersecurity specialists in San Antonio43
Cybersecurity specialists in Los Angeles42
Cybersecurity specialists in San Diego39
Cybersecurity specialists in Arlington38
Cybersecurity specialists in Boston37
Cybersecurity specialists in Charlotte36
Cybersecurity specialists in Baltimore34
Cybersecurity specialists in Denver34
Cybersecurity specialists in Las Vegas32
Cybersecurity specialists in Orlando30
Cybersecurity specialists in Phoenix30
Cybersecurity specialists in Reston30
Cybersecurity specialists in Sheridan30
Cybersecurity specialists in Plano29
Cybersecurity specialists in Huntsville27
Cybersecurity specialists in Alexandria26
Cybersecurity specialists in Mclean26
Cybersecurity specialists in Fairfax25
Cybersecurity specialists in Seattle25

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 cybersecurity specialists, 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 cybersecurity specialists are there based in New York, United States?

RevenueBase identified 125 cybersecurity specialists 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?

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

Which city has the most cybersecurity specialists?

New York leads with 125 headquartered companies, followed by Houston (83) and Atlanta (81).

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 994 verified decision-maker contacts tracked across these 125 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.