Company lists · Data refreshed September 2026

Top 25 Cybersecurity software developers based in the United States

Name: Cybersecurity software developers based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 715 companies tracked

RevenueBase identified 715 cybersecurity software developers headquartered in the United States as of September 2026 and tracks 55,362 professional contacts across them, including 24,820 with verified work emails. New York is the largest hub.

This list covers cybersecurity software developers headquartered in the 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 28, 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 28, 2026 86% judged on-target in blind review

715Companies

55,362Contacts tracked

24,820Verified emails

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The 25 largest cybersecurity software developers based in the United States

Ranked by team size

Top 25 of 715 cybersecurity software developers based in the United States, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to cybersecurity software developers: 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	Palo Alto Networks	Partial evidence	Santa Clara, CA, United StatesHQ checked Sep 28, 2026	10001+	18,431 contacts →
	Partial evidence “Palo Alto Networks, the global cybersecurity leader, is shaping the cloud-centric future with technology that is transforming the way people and organizations operate.” Source: RevenueBase Database · checked Sep 28, 2026
2	Fortinet	Indirect evidence	Sunnyvale, CA, United StatesHQ checked Sep 28, 2026	10001+	14,289 contacts →
	Indirect evidence “Fortinet makes possible a digital world that we can always trust through its mission to protect people, devices, and data everywhere.” Source: RevenueBase Database · checked Sep 28, 2026
3	Symantec	Partial evidence	San Jose, CA, United StatesHQ checked Sep 28, 2026	10001+	11,169 contacts →
	Partial evidence “Your backstage pass to the most epic cybersecurity solutions on the market for Endpoint, Network, Data and Cloud security.” Source: RevenueBase Database · checked Sep 28, 2026
4	Malwarebytes	Indirect evidence	Santa Clara, CA, United StatesHQ checked Sep 28, 2026	501-1,000	604 contacts →
	Indirect evidence “Malwarebytes is reimagining security to safeguard devices, data, and people, no matter their location, lifestyle or means.” Source: RevenueBase Database · checked Sep 28, 2026
5	Guidance Software	Indirect evidence	Pasadena, CA, United StatesHQ checked Sep 28, 2026	501-1,000	492 contacts →
	Indirect evidence “Guidance (NASDAQ: GUID) exists to turn chaos and the unknown into order and the known-so that companies and their customers can go about their daily lives as usual without worry…” Source: RevenueBase Database · checked Sep 28, 2026
6	Novacoast	Strong evidence	Wichita, KS, United StatesHQ checked Sep 28, 2026	201-500	369 contacts →
	Strong evidence “Novacoast is an international cybersecurity company specializing in IT services and software development.” Source: RevenueBase Database · checked Sep 28, 2026
7	horizon3.ai	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 28, 2026	201-500	364 contacts →
	Partial evidence “Horizon3.ai answers the two most important questions in cybersecurity: If someone tried to compromise us, would we hold up?” Source: RevenueBase Database · checked Sep 28, 2026
8	Reversinglabs	Partial evidence	Cambridge, MA, United StatesHQ checked Sep 28, 2026	201-500	340 contacts →
	Partial evidence “ReversingLabs is the trusted name in file and software security.” Source: RevenueBase Database · checked Sep 28, 2026
9	ONTIC	Indirect evidence	Austin, TX, United StatesHQ checked Sep 28, 2026	201-500	317 contacts →
	Indirect evidence “At Ontic, you’ll join a team driven by collaboration, innovation, and a shared sense of purpose.” Source: RevenueBase Database · checked Sep 28, 2026
10	Millennium Corporation	Partial evidence	Arlington, VA, United StatesHQ checked Sep 28, 2026	201-500	265 contacts →
	Partial evidence “For nearly two decades, Millennium Corporation has been operating on the leading edge of cybersecurity.” Source: RevenueBase Database · checked Sep 28, 2026
11	Loginsoft	Partial evidence	Chantilly, VA, United StatesHQ checked Sep 28, 2026	201-500	220 contacts →
	Partial evidence “For over 20 years, leading companies in Telecom, Cybersecurity, Healthcare, Banking, New Media, and more have come to rely on Loginsoft as a trusted resource for technology talent.” Source: RevenueBase Database · checked Sep 28, 2026
12	Webroot	Indirect evidence	Broomfield, CO, United StatesHQ checked Sep 28, 2026	501-1,000	199 contacts →
	Indirect evidence “Webroot, an OpenText company, was the first to harness the cloud and artificial intelligence to stop zero-day threats in real time.” Source: RevenueBase Database · checked Sep 28, 2026
13	Eset North America	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 28, 2026	51-200	180 contacts →
	Indirect evidence “For more than 30 years we have been here helping to watch over and protect progress.” Source: RevenueBase Database · checked Sep 28, 2026
14	Assured Information Security AIS	Indirect evidence	Rome, NY, United StatesHQ checked Sep 28, 2026	201-500	173 contacts →
	Indirect evidence “Our roots trace directly to cyber and information security and our well documented contributions are proof.” Source: RevenueBase Database · checked Sep 28, 2026
15	Stratascale	Partial evidence	Charlotte, NC, United StatesHQ checked Sep 28, 2026	201-500	171 contacts →
	Partial evidence “Stratascale is a premier services company proudly operating as the cybersecurity division of SHI.” Source: RevenueBase Database · checked Sep 28, 2026
16	Fidelis Security	Indirect evidence	Riverside, CA, United StatesHQ checked Sep 28, 2026	51-200	147 contacts →
	Indirect evidence “Fidelis Security® is the industry innovator in proactive cyber defense, safeguarding modern IT for global enterprises with proactive XDR and CNAPP platforms.” Source: RevenueBase Database · checked Sep 28, 2026
17	Ishpi Information Technologies, Inc. Ishpi	Indirect evidence	Suffolk, VA, United StatesHQ checked Sep 28, 2026	201-500	127 contacts →
	Indirect evidence “ISHPI works in concert with other defenders of the Homeland to fortify national preparedness, agility, strength and advantage in the cyber domain – a readiness state we refer to…” Source: RevenueBase Database · checked Sep 28, 2026
18	Sealing Technologies, A Parsons Company	Partial evidence	Columbia, MD, United StatesHQ checked Sep 28, 2026	51-200	119 contacts →
	Partial evidence “SealingTech, a Parsons Company, rapidly delivers innovative, agile cybersecurity solutions that modernize, protect, and defend the networks and systems of the federal government…” Source: RevenueBase Database · checked Sep 28, 2026
19	Kudu Dynamics LLC	Indirect evidence	Chantilly, VA, United StatesHQ checked Sep 28, 2026	51-200	113 contacts →
	Indirect evidence “Those who play with the devil's toys will be brought by degrees to wield his sword.~ R.” Source: RevenueBase Database · checked Sep 28, 2026
20	Adapt Forward	Partial evidence	North Charleston, SC, United StatesHQ checked Sep 28, 2026	51-200	113 contacts →
	Partial evidence “Adapt Forward helps government agencies outpace adversaries through proven Cybersecurity Service Provider (CSSP) operations, mission-focused innovation, and a people first culture…” Source: RevenueBase Database · checked Sep 28, 2026
21	Shorepoint INC	Partial evidence	Washington, DC, United StatesHQ checked Sep 28, 2026	n/a	106 contacts →
	Partial evidence “ShorePoint recognizes that cybersecurity is the challenge of our generation.” Source: RevenueBase Database · checked Sep 28, 2026
22	Foresite Cybersecurity	Indirect evidence	Overland Park, KS, United StatesHQ checked Sep 28, 2026	51-200	101 contacts →
	Indirect evidence “As the world becomes more connected, our lives and businesses are more vulnerable.” Source: RevenueBase Database · checked Sep 28, 2026
23	Drawbridge	Strong evidence	Palm Beach Gardens, FL, United StatesHQ checked Sep 28, 2026	51-200	100 contacts →
	Strong evidence “Drawbridge is a premier provider of cybersecurity software and solutions to the alternative investment and wealth management industry.” Source: RevenueBase Database · checked Sep 28, 2026
24	Hunter Strategy	Strong evidence	Pompano Beach, DC, United StatesHQ checked Sep 28, 2026	51-200	100 contacts →
	Strong evidence “Cybersecurity and software engineering SMEs that help Government and Commercial customers build secure scalable solutions.” Source: RevenueBase Database · checked Sep 28, 2026
25	Defy Security	Partial evidence	Canonsburg, PA, United StatesHQ checked Sep 28, 2026	51-200	89 contacts →
	Partial evidence “Defy Security was founded in 2017 with one primary goal: to change the cybersecurity buying experience by delivering value and service that is unmatched.” Source: RevenueBase Database · checked Sep 28, 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 software developers. 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 software developers.
Partial evidence: Its own public description names part of cybersecurity software developers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name cybersecurity software developers. 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 715 cybersecurity software developers based in the United States

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Cybersecurity software developers based in the United States at a glance

As of Sep 28, 2026

44.8%Verified-email coverage

77.4Average contacts per company

11-50Median size (employees)

2.7%Largest-city concentration · New York

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

348

11-50

239

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 715 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 software developers, 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 the United States whose own description of what they do matches “cybersecurity software developers”. 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 software developers), 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 software developers, and records with no verified work email. Companies headquartered outside United States 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, 24,820 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 28, 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 cybersecurity software developers, 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 software developers are there based in the United States?

RevenueBase identified 715 cybersecurity software developers headquartered in the 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?

Palo Alto Networks, headquartered in Santa Clara, tops this list with the largest team on record.

Which city has the most cybersecurity software developers?

New York leads with 19 headquartered companies, followed by San Francisco (18) and Washington (17).

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 24,820 verified decision-maker contacts tracked across these 715 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 28, 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.