Company lists · Data verified August 2026

Top 25 Cybersecurity energy sector companies based in the United States

Name: Cybersecurity energy sector 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 717 companies tracked

There are 717 cybersecurity energy sector companies headquartered in the United States (RevenueBase, August 2026). RevenueBase tracks 9,849 professional contacts across them, including 4,202 with verified work emails and 3,823 with mobile numbers. Houston is the largest hub.

This list covers cybersecurity energy sector 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.

717Companies

9,849Contacts tracked

4,202Verified emails

3,823Mobile numbers

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The 25 largest cybersecurity energy sector companies based in the United States

Ranked by team size

Top 25 of 717 cybersecurity energy sector 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	Guidepoint Security	Tampa, FL	1,001-5,000	1,234	809
2	Dragos, INC	Houston, TX	501-1,000	544	382
3	Securityhq	New York, NY	501-1,000	492	279
4	Mnemonic	Redwood City, CA	201-500	345	9
5	Amsys Innovative Solutions	Houston, TX	201-500	311	123
6	Lumifi	Scottsdale, AZ	51-200	247	92
7	Netdata Cybersecurity	Miami, FL	201-500	209	78
8	Deepseas	n/a	201-500	185	132
9	Nuharbor Security	Boston, MA	51-200	149	91
10	SOLIS	Austin, TX	51-200	137	79
11	Ciso Global	Scottsdale, AZ	201-500	134	85
12	Helpsystems	Eden Prairie, MN	1,001-5,000	132	27
13	Adapt Forward	North Charleston, SC	51-200	130	36
14	Directdefense	Denver, CO	51-200	112	87
15	Everline	Houston, TX	201-500	101	74
16	Accessit Group	King Of Prussia, PA	51-200	92	57
17	Techguard Security	Ofallon, IL	51-200	81	22
18	Cyberclan	Las Vegas, NV	51-200	78	35
19	Vertek Corporation	Burlington, VT	51-200	76	49
20	Delviom, LLC	Ashburn, VA	51-200	64	19
21	Apollo Information Systems	Dallas, TX	51-200	63	40
22	Blackhawk Technology Group	Larose, LA	51-200	57	1
23	Def-Logix, INC	San Antonio, TX	51-200	56	16
24	Secure Traces	Alpharetta, GA	51-200	53	6
25	Guard 1 Services	Houston, TX	51-200	53	6

Showing 25 of 717 cybersecurity energy sector companies based in the United States

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Cybersecurity energy sector companies based in the United States at a glance

As of Aug 28, 2026

1-10Median size (employees)

HoustonLargest hub · 26 HQs

3,823Contacts with mobile numbers

7Emails re-verified in last 30 days

Companies by employee count

1-10

365

11-50

244

51-200

201-500

501-1,000

1,001-5,000

Cybersecurity energy sector companies by metro

Metro	Companies
Cybersecurity energy sector companies in Houston	26
Cybersecurity energy sector companies in Dallas	18
Cybersecurity energy sector companies in New York	15
Cybersecurity energy sector companies in Austin	14
Cybersecurity energy sector companies in Washington	12
Cybersecurity energy sector companies in Charlotte	12
Cybersecurity energy sector companies in Miami	12

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 “cybersecurity energy sector 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; 7 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 cybersecurity energy sector companies are there based in the United States?

There are 717 cybersecurity energy sector companies headquartered in the United States as of August 2026 (RevenueBase).

What is the largest company on this list?

Guidepoint Security, headquartered in Tampa, tops this list with the largest team on record.

Which city has the most cybersecurity energy sector companies?

Houston leads with 26 headquartered companies, followed by Dallas (18) and New York (15).

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 4,202 verified decision-maker contacts tracked across these 717 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.