Company lists · Data verified August 2026

Top 25 Cybersecurity incident response firms based in the United States

Name: Cybersecurity incident response firms 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 3,028 companies tracked

There are 3,028 cybersecurity incident response firms headquartered in the United States (RevenueBase, August 2026). RevenueBase tracks 56,170 professional contacts across them, including 24,356 with verified work emails and 19,070 with mobile numbers. New York is the largest hub.

This list covers cybersecurity incident response firms 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.

3,028Companies

56,170Contacts tracked

24,356Verified emails

19,070Mobile numbers

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The 25 largest cybersecurity incident response firms based in the United States

Ranked by team size

Top 25 of 3,028 cybersecurity incident response firms 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	Commvault	Tinton Falls, NJ	1,001-5,000	4,050	2,207
2	Trellix	Plano, TX	1,001-5,000	3,490	1,633
3	OPTIV	Chantilly, VA	1,001-5,000	2,206	1,422
4	Bitdefender	Fort Lauderdale, FL	1,001-5,000	2,141	1,230
5	Reliaquest	Sandy, UT	1,001-5,000	1,252	980
6	Guidepoint Security	Tampa, FL	1,001-5,000	1,234	809
7	Brosnan Risk Consultants	Newhall, CA	5,001-10,000	1,047	188
8	Bitsight	Raleigh, NC	501-1,000	753	158
9	Coalition, INC	San Francisco, CA	501-1,000	719	562
10	Telos Corporation	Las Vegas, NV	501-1,000	636	230
11	Vikingcloud	Chicago, IL	1,001-5,000	618	436
12	Levelblue	Dallas, TX	1,001-5,000	582	372
13	Ultraviolet Cyber	Phoenix, AZ	501-1,000	517	258
14	Securityhq	New York, NY	501-1,000	492	279
15	Alertmedia	Austin, TX	201-500	489	326
16	ARETE	New York, NY	201-500	462	301
17	Palo Alto Networks Unit 42	Santa Clara, CA	5,001-10,000	438	306
18	Kudelski Security	Irving, TX	201-500	404	201
19	RED Canary, A Zscaler Company	Denver, CO	201-500	402	270
20	Mnemonic	Redwood City, CA	201-500	345	9
21	Security Risk Advisors	Philadelphia, PA	201-500	311	216
22	Cipher A Prosegur Company	Miami, FL	201-500	294	70
23	Critical Start	Plano, TX	201-500	292	159
24	Silversky	Mount Laurel, NJ	201-500	291	121
25	Deepwatch	Tampa, FL	201-500	279	140

Showing 25 of 3,028 cybersecurity incident response firms based in the United States

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Cybersecurity incident response firms based in the United States at a glance

As of Aug 28, 2026

1-10Median size (employees)

New YorkLargest hub · 96 HQs

19,070Contacts with mobile numbers

46Emails re-verified in last 30 days

Companies by employee count

1-10

1,683

11-50

930

51-200

300

201-500

501-1,000

1,001-5,000

5,001-10,000

Cybersecurity incident response firms by metro

Metro	Companies
Cybersecurity incident response firms in New York	96
Cybersecurity incident response firms in Washington	68
Cybersecurity incident response firms in Atlanta	59
Cybersecurity incident response firms in Austin	58
Cybersecurity incident response firms in Dallas	53
Cybersecurity incident response firms in Chicago	52
Cybersecurity incident response firms in Miami	52

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 incident response firms”, 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; 46 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 incident response firms are there based in the United States?

There are 3,028 cybersecurity incident response firms headquartered in the United States as of August 2026 (RevenueBase).

What is the largest company on this list?

Commvault, headquartered in Tinton Falls, tops this list with the largest team on record.

Which city has the most cybersecurity incident response firms?

New York leads with 96 headquartered companies, followed by Washington (68) and Atlanta (59).

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 24,356 verified decision-maker contacts tracked across these 3,028 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.