Company lists · Data refreshed August 2026

Top 25 Cloud email security companies based in the United States

Name: Cloud email security companies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Aug 31, 2026 458 companies tracked

RevenueBase identified 458 cloud email security companies headquartered in the United States as of August 2026 and tracks 46,328 professional contacts across them, including 21,709 with verified work emails and 12,264 with mobile numbers. New York is the largest hub.

This list covers cloud email security companies 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 August 31, 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 RevenueBase Smart Search rating on every row Refreshed Aug 31, 2026 86% judged on-target in blind review

458Companies

46,328Contacts tracked

21,709Verified emails

12,264Mobile numbers

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The 25 largest cloud email security companies based in the United States

Ranked by team size

Top 25 of 458 cloud email security companies based in the United States, ranked by team size, largest first. Data refreshed Aug 31, 2026. RevenueBase Smart Search rates how each company's information relates to cloud email 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.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Symantec	Strong evidence	San Jose, CA, United States	10001+	11,179 contacts →
	Strong evidence “Your backstage pass to the most epic cybersecurity solutions on the market for Endpoint, Network, Data and Cloud security.” Source: RevenueBase Database · checked Aug 31, 2026
2	Crowdstrike	Strong evidence	Remote, United States	5,001-10,000	10,059 contacts →
	Strong evidence “CrowdStrike (Nasdaq: CRWD), a global cybersecurity leader, has redefined modern security with the world’s most advanced cloud-native platform for protecting critical areas of…” Source: RevenueBase Database · checked Aug 31, 2026
3	Rubrik	Partial evidence	Reston, VA, United States	1,001-5,000	4,381 contacts →
	Partial evidence “Rubrik (NYSE: RBRK), the Security and AI company, operates at the intersection of data protection, cyber resilience and enterprise AI acceleration.” Source: RevenueBase Database · checked Aug 31, 2026
4	Qualys	Strong evidence	Foster City, CA, United States	1,001-5,000	3,042 contacts →
	Strong evidence “Qualys, Inc.(NASDAQ: QLYS) is a leading provider of disruptive cloud-based security, compliance and IT solutions with more than subscription customers worldwide, including a…” Source: RevenueBase Database · checked Aug 31, 2026
5	Netskope	Strong evidence	Santa Clara, CA, United States	1,001-5,000	3,025 contacts →
	Strong evidence “Netskope (NASDAQ: NTSK), a leader in modern security and networking for the cloud and AI era, addresses the needs of both security and networking teams by providing optimized…” Source: RevenueBase Database · checked Aug 31, 2026
6	WIZ	Partial evidence	West New York, NY, United States	1,001-5,000	2,528 contacts →
	Partial evidence “Wiz, now part of Google Cloud, protects everything you build and run.” Source: RevenueBase Database · checked Aug 31, 2026
7	Barracuda	Indirect evidence	Alpharetta, GA, United States	1,001-5,000	2,108 contacts →
	Indirect evidence “Barracuda is a leading global cybersecurity company providing complete protection against complex threats for all size business.” Source: RevenueBase Database · checked Aug 31, 2026
8	Skyhigh Security	Strong evidence	San Jose, CA, United States	501-1,000	647 contacts →
	Strong evidence “Skyhigh Security protects organizations with cloud-native security solutions that are both data-aware and simple to use.” Source: RevenueBase Database · checked Aug 31, 2026
9	Nsfocus	Partial evidence	Santa Clara, CA, United States	1,001-5,000	284 contacts →
	Partial evidence “NSFOCUS is an iconic internet and application security company with over 20 years of proven industry experience.” Source: RevenueBase Database · checked Aug 31, 2026
10	Sublime Security	Strong evidence	Washington, DC, United States	201-500	237 contacts →
	Strong evidence “Sublime is the new standard for email security.” Source: RevenueBase Database · checked Aug 31, 2026
11	Netdata Cybersecurity	Indirect evidence	Miami, FL, United States	201-500	209 contacts →
	Indirect evidence “Netdata is a leading global cybersecurity services partner with more than 200 certified engineers and over 1,500 certifications, widely recognized as a partner of Palo Alto…” Source: RevenueBase Database · checked Aug 31, 2026
12	ZIX	Strong evidence	Dallas, TX, United States	501-1,000	200 contacts →
	Strong evidence “Zix, an OpenText company, is a leader in email security and helps organizations overcome their greatest digital transformation challenges by providing a secure, modern workplace.” Source: RevenueBase Database · checked Aug 31, 2026
13	Ironscales	Strong evidence	Atlanta, GA, United States	51-200	165 contacts →
	Strong evidence “IRONSCALES is the leader in AI-powered email security protecting over global organizations from advanced phishing threats.” Source: RevenueBase Database · checked Aug 31, 2026
14	Easydmarc	Partial evidence	Dover, DE, United States	51-200	127 contacts →
	Partial evidence “EasyDMARC is your one-stop platform that secures your email domain infrastructure and boosts email deliverability for your peace of mind.” Source: RevenueBase Database · checked Aug 31, 2026
15	OTAVA	Partial evidence	Indianapolis, IN, United States	51-200	115 contacts →
	Partial evidence “OTAVA is your secure & compliant multi-cloud expert.” Source: RevenueBase Database · checked Aug 31, 2026
16	Appriver	Strong evidence	Atlanta, GA, United States	201-500	114 contacts →
	Strong evidence “AppRiver, an OpenText company, company, is a channel-first provider of cloud-enabled security and productivity services, with a 4,500-strong reseller community that protects…” Source: RevenueBase Database · checked Aug 31, 2026
17	Valimail	Partial evidence	Denver, CO, United States	51-200	108 contacts →
	Partial evidence “Valimail, now a DigiCert company, is the industry leader in redefining email authentication for the zero-trust era.” Source: RevenueBase Database · checked Aug 31, 2026
18	Visory	Partial evidence	Swanzey, NH, United States	51-200	101 contacts →
	Partial evidence “Visory provides secure, cloud-powered IT and cybersecurity solutions for regulated industries, including wealth management, accounting and construction.” Source: RevenueBase Database · checked Aug 31, 2026
19	spin.ai	Partial evidence	Palo Alto, CA, United States	51-200	101 contacts →
	Partial evidence “Spin.AI is a leading SaaS security company dedicated to protecting mission-critical SaaS applications data, including Google Workspace, Microsoft 365, Salesforce, Slack, Jira and…” Source: RevenueBase Database · checked Aug 31, 2026
20	Material Security	Strong evidence	San Francisco, CA, United States	51-200	87 contacts →
	Strong evidence “Material Security is an automated detection and response toolkit for Google Workspace and Microsoft 365, combining email security, data security, identity protection, and…” Source: RevenueBase Database · checked Aug 31, 2026
21	Eshare	Indirect evidence	Waltham, MA, United States	51-200	85 contacts →
	Indirect evidence “Trust at Scale.” Source: RevenueBase Database · checked Aug 31, 2026
22	Cycl Powered By Bugsec	Strong evidence	Wilmington, DE, United States	51-200	72 contacts →
	Strong evidence “At CYCL, we merge cloud security experts with AI-based behavioral detection to form our Cloud Native Managed CDR solution.” Source: RevenueBase Database · checked Aug 31, 2026
23	Privafy	Indirect evidence	Burlington, MA, United States	51-200	66 contacts →
	Indirect evidence “About Privafy We are redefining how to protect Data-in-Motion.” Source: RevenueBase Database · checked Aug 31, 2026
24	Paubox	Strong evidence	San Francisco, CA, United States	51-200	63 contacts →
	Strong evidence “Paubox is a leader in HIPAA compliant email security for healthcare.” Source: RevenueBase Database · checked Aug 31, 2026
25	Cyber Security Cloud	Strong evidence	Los Angeles, CA, United States	201-500	60 contacts →
	Strong evidence “Cyber Security Cloud makes cloud security easy with intelligent web protection at the edge.” Source: RevenueBase Database · checked Aug 31, 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: cloud email security companies. 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 cloud email security companies.
Partial evidence: Its own public description names part of cloud email security companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name cloud email security companies. 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 458 cloud email security companies based in the United States

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Cloud email security companies based in the United States at a glance

As of Aug 31, 2026

46.9%Verified-email coverage

26.5%Mobile-number coverage

101.2Average contacts per company

11-50Median size (employees)

4.8%Largest-city concentration · New York

Aug 31, 2026Page data refreshed

Companies by employee count

1-10

187

11-50

170

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

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 cloud email 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 the United States whose own description of what they do matches “cloud email 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 cloud email 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 cloud email security companies, 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, 21,709 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 August 31, 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 cloud email 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 cloud email security companies are there based in the United States?

RevenueBase identified 458 cloud email security companies headquartered in the United States as of August 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?

Symantec, headquartered in San Jose, tops this list with the largest team on record.

Which city has the most cloud email security companies?

New York leads with 22 headquartered companies, followed by San Francisco (22) and Atlanta (12).

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 21,709 verified decision-maker contacts tracked across these 458 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on August 31, 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.