Company lists · Data verified 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 Verified Aug 28, 2026 458 companies tracked

There are 458 cloud email security companies headquartered in the United States (RevenueBase, August 2026). RevenueBase 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. Data current as of August 28, 2026.

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 verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	Symantec	San Jose, CA	10001+	11,179	876
2	Crowdstrike	Remote	5,001-10,000	10,059	7,290
3	Rubrik	Reston, VA	1,001-5,000	4,381	2,545
4	Qualys	Foster City, CA	1,001-5,000	3,042	2,121
5	Netskope	Santa Clara, CA	1,001-5,000	3,025	1,996
6	WIZ	West New York, NY	1,001-5,000	2,528	1,647
7	Barracuda	Alpharetta, GA	1,001-5,000	2,108	1,463
8	Skyhigh Security	San Jose, CA	501-1,000	647	313
9	Nsfocus	Santa Clara, CA	1,001-5,000	284	23
10	Sublime Security	Washington, DC	201-500	237	50
11	Netdata Cybersecurity	Miami, FL	201-500	209	78
12	ZIX	Dallas, TX	501-1,000	200	64
13	Ironscales	Atlanta, GA	51-200	165	97
14	Easydmarc	Dover, DE	51-200	127	66
15	OTAVA	Indianapolis, IN	51-200	115	94
16	Appriver	Atlanta, GA	201-500	114	86
17	Valimail	Denver, CO	51-200	108	64
18	Visory	Swanzey, NH	51-200	101	54
19	spin.ai	Palo Alto, CA	51-200	101	47
20	Material Security	San Francisco, CA	51-200	87	52
21	Eshare	Waltham, MA	51-200	85	43
22	Cycl Powered By Bugsec	Wilmington, DE	51-200	72	37
23	Privafy	Burlington, MA	51-200	66	31
24	Paubox	San Francisco, CA	51-200	63	29
25	Cyber Security Cloud	Los Angeles, CA	201-500	60	7

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 28, 2026

11-50Median size (employees)

New YorkLargest hub · 22 HQs

12,264Contacts with mobile numbers

109Emails re-verified in last 30 days

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+

Cloud email security companies by metro

Metro	Companies
Cloud email security companies in New York	22
Cloud email security companies in San Francisco	22
Cloud email security companies in Atlanta	12
Cloud email security companies in Miami	11
Cloud email security companies in Dallas	8
Cloud email security companies in Boston	8
Cloud email security companies in Washington	8
Cloud email security companies in Los Angeles	8

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “cloud email security companies”, with match quality audited by blind human judging, and headquartered in the United States.
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: Contact records re-verify on a rolling cadence; 109 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

How many cloud email security companies are there based in the United States?

There are 458 cloud email security companies headquartered in the United States as of August 2026 (RevenueBase).

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 is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 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, the same data that powers RevenueBase's B2B data products and the free research portal.