List of Cybersecurity Companies in the USA

Name: List of Cybersecurity Companies in the USA
Creator: CompanyData

Last updated 21 October 2026

There are 3,426 cybersecurity companies in the USA, one in every 18,643 US companies. Most of them are small: seven in ten have one to four people, and only 132 firms employ 50 people or more. One in twenty cybersecurity firms is based in New York, Houston, Atlanta, San Francisco and San Antonio. Below you find the largest cybersecurity firms in the USA, the cities where they cluster, how many started this year and which are the oldest. The full list with addresses, phone numbers and email is in our US company database or through the Company Data API.

3,426 companies indexed · Data counted on 21 October 2026

Companies3,4261 in18,643 US companiesCities833Largest cityNew York 63Sole traders0.8%Employees1-4 (69%)Revenue$100-500K (41%)Email75%Phone99%Website98%

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A live view of all 3,426 cybersecurity firms, sorted by revenue. Narrow it by region, city, employee size, revenue, legal form or founding year, or search a firm by name.

Optiv Parent INC.Optiv Parent INC.

	Company Name	Country	City	Address 1	State/Province	Postal Code	Website	Founding Year	Yearly Revenue in U.S. Dollars	Employees Total	Business Legal Type - Description	Number of Companies in Group	Company Registration Number
1	Optiv Parent INC.	USA	Denver	1144 15th St Ste 2900	Denver	80202	*****.com	2017	$2,909,196,046	2,500	Corporation	24	N/A
2	Zscaler, INC.	USA	San Jose	120 Holger Way	Santa Clara	95134-1376	*****.com	2007	$2,673,115,000	7,923	Corporation	39	DB173759
3	Verisign, INC.	USA	Reston	12061 Bluemont Way	Fairfax County	20190-5684	*****.com	1995	$1,656,600,000	928	Corporation	62	2497886
4	Sentinelone, INC.	USA	Mountain View	444 Castro St Ste 400	San Bernardino	94041-2053	*****.com	2013	$1,001,278,000	2,900	Corporation	23	5278570
5	Tenable Holdings, INC.	USA	Columbia	6100 Merriweather Dr	Howard	21044-3486	*****.com	2002	$999,405,000	1,995	Corporation	29	5856897
6	Proofpoint Holdings, LP	USA	Sunnyvale	925 W Maude Ave	Santa Clara	94085-2802	*****.com	2021	$602,072,871	3,375	Partnership of unknown type	84	5834669
7	New Era Technology, INC.	USA	West Chester	901 S Bolmar St Bldg 1	Chester	19382-4550	*****.com	1990	$591,442,299	6,700	Corporation	45	5358742
8	Thales Dis USA, INC.	USA	Austin	9442 N Capital of Texas Hwy Bldg 2	Travis	78759-7262	*****.com	1990	$502,079,808	884	Corporation	605	2221542
9	Thrive Operations, LLC	USA	Foxborough (foxboro)	25 Forbes Blvd Unit 3	Norfolk	02035-2873	*****.com	2016	$488,723,522	1,085	Corporation	26	6223390
10	Optiv Security INC.	USA	Denver	1144 15th St Ste 2900	Denver	80202	*****.com	2016	$445,694,597	1,880	Corporation	24	5341023
11	Proofpoint, INC.	USA	Sunnyvale	925 W Maude Ave	Santa Clara	94085-2802	*****.com	2002	$424,701,607	3,375	Corporation	84	3540718
12	Secureworks CORP.	USA	Atlanta	1 Concourse Pkwy Ste 500	Fulton	30328-5346	*****.com	2025	$365,879,000	1,516	Corporation	72	5887364
13	Blueally Technology Solutions, LLC	USA	Atlanta	3475 Piedmont Rd Ne Ste 900	Fulton	30305-2990	*****.com	2013	$264,119,572	454	Corporation	9	3101143
14	Zerofox Holdings, INC.	USA	Baltimore	1834 S Charles St	Baltimore City	21230-4826	*****.com	2024	$233,300,000	927	Corporation	12	6449347
15	Accessit Group, LLC	USA	King of Prussia	20106 Valley Forge Cir	Montgomery	19406-1112	*****.com	2001	$190,000,000	80	Corporation	812	0002983771
16	Guidepoint Security LLC	USA	Reston	1900 Reston Metro Plz Ste 701	Fairfax County	20190-5953	*****.com	2011	$179,218,264	151	Corporation	3	S3821867
17	Trend Micro Incorporated	USA	Irving	225 E John Carpenter Fwy Ste 1500	Dallas	75062	*****.com	1988	$170,764,784	630	Corporation	60	1919248
18	Vectra AI, INC.	USA	San Jose	550 S Winchester Blvd Ste 200	Santa Clara	95128-2579	*****.com	2010	$150,040,000	740	Corporation	5	N/A
19	Opswat INC.	USA	Tampa	615 Channelside Dr Ste 201	Hillsborough	33602-5407	*****.com	2002	$145,254,818	1,100	Corporation	13	5344534
20	Tenable, INC.	USA	Columbia	6100 Merriweather Dr Fl 12	Howard	21044-3486	*****.com	2002	$137,562,209	625	Corporation	29	3569085
21	Trustwave Holdings, INC.	USA	Chicago	70 W Madison St Ste 600	Cook	60602-4210	*****.com	2025	$136,491,598	1,070	Corporation	51	3939737
22	Thales Defense & Security, INC.	USA	Clarksburg	22605 Gateway Center Dr	Montgomery	20871-2001	*****.com	2001	$133,147,644	400	Corporation	605	0613102
23	Center For Internet Security, INC.	USA	East Greenbush	31 Tech Valley Dr	Rensselaer	12061	*****.org	2000	$126,259,286	181	Corporation	2	D06058812
24	Myriad360, LLC	USA	New York	199 Water St	New York	10038-3526	*****.com	2002	$119,880,114	43	Corporation	18	2845237
25	Arete Advisors, LLC	USA	Boca Raton	4800 T Rex Ave	Palm Beach	33431-4447	*****.com	2016	$100,000,000	450	Corporation	N/A	L16000176873

Showing 25 of 3,426 companies

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Cybersecurity firms in New York

New York has 63 cybersecurity companies and cybersecurity firms, <0.1% of all 732,093 New York companies and 60% above the national share. Half New York firms have fewer than five people; 5 have 50 or more. 0 new firms were entered in 2026, 2 date from before 1990.

Size

1-4 staff: 29 · 47%
5-9: 9 · 15%
10-19: 12 · 19%
20-49: 7 · 11%
50+: 5 · 8%

Legal form

Sole traders: 1 · 2%
Partnerships: 0 · 0%
Corporations and LLCs: 53 · 84%
Other or none: 9 · 14%

Of the US total: 1.8%
Of all New York companies: <0.1%
Against the national share: 1.6×

New

Entered 2026 so far: 0
Entered 2025: 0
Of USA's 2026 entries: 0.0%

Old

Before 1990: 2 · 3%
1990 or later: 61 · 97%
Of USA's pre-1990 firms: 4.9%

Reachable

Email: 37 · 59%
Phone: 62 · 98%
Website: 60 · 95%

Revenue (USD)

Under $100K: 7 · 12%
$100K-$500K: 21 · 36%
$500K-$1M: 10 · 17%
$1M and more: 20 · 34%

Largest

1405
2110
3108
460
550

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Where in the USA?

New York has the most cybersecurity companies in the USA (63), ahead of Houston (32), Atlanta (27), San Francisco (26) and San Antonio (25). Together the five hold one in twenty of them.

Cities by number of firms

833 US cities have at least one cybersecurity firm; 40 have ten or more; 482 have exactly one. Click a city to set the lens.

How many cybersecurity companies are there in the USA?

Cybersecurity companies and cybersecurity firms in the USA

3,426

21 October 2026

There are 3,426 cybersecurity companies and cybersecurity firms in the USA in our data (21 October 2026). That is one in every 18,643 US companies. About one new firm is entered in the register every working day this year (207 so far in 2026).

Structure

Single-site firms: 3,048 89%
Head offices: 235
Branch offices: 143

Classification

Our platform counts them on the CompanyData industry label 113215.

2,919 of the 3,426 are corporations and LLCs (85%); 27 are sole traders. They come from the state business registers and our US register data, through the Company Data API.

Largest cybersecurity firms in the USA

The biggest firms by staff and by revenue, the largest in New York. Click a name for the record.

Zscaler is the largest cybersecurity firm in the USA by headcount. 132 firms employ 50 people or more; 59 employ 100 or more.

1San Jose7,923 staff
2West Chester6,700 staff
3Sunnyvale3,375 staff
4Mountain View2,900 staff
5Columbia1,995 staff
6Denver1,880 staff
7Austin1,600 staff
8Tampa1,200 staff
9Tampa1,100 staff
10Foxborough1,085 staff

By employee size · 3,301 firms with a known headcount

Employees	Firms	%
1-4	2,276	69%
5-9	384	12%
10-19	262	8%
20-49	247	7%
50-99	73	2%
100-199	31	0.9%
200-499	21	0.6%
500-999	4	0.1%
1,000+	3	<0.1%

69% have 1 to 4 people; 247 have 20 to 49; 132 have 50 or more.

By yearly revenue (USD)

Revenue	Firms	%
< $100K	1,020	32%
$100K-$500K	1,286	41%
$500K-$1M	230	7%
$1M-$5M	398	13%
$5M-$10M	99	3%
$10M-$50M	92	3%
$50M-$100M	10	0.3%
$100M-$500M	17	0.5%
$500M+	8	0.3%

41% between $100,000 and $500,000; 398 between $1M and $5M; 226 above $5M.

Firm sizes in the USA

Of the 3,301 US cybersecurity firms with a known headcount, 2,276 (69%) have one to four people, 384 have five to nine, 509 have ten to 49 and 132 have 50 or more. Most firms turn over between $100,000 and $500,000 a year (1,286, 41%).

EU size bands · the grey line shows all US companies

Micro under 102,660 81%
Small 10 to 49509 15%
Medium 50 to 249125 4%
Large 250+7 0.2%

Grey line: the share among all US companies (96% have under ten staff).

226

firms turn over more than $5 million a year; 127 more than $10 million.

207

firms were entered in 2026.

The oldest firms in the USA

Our data holds 0 US cybersecurity firms from before 1900, 1 from before 1950 and 41 from before 1990.

1917
1. El Paso
1953
1. Worcester
1956
1. San Leandro
1964
1. Honolulu
1966
1. Stuart
1967
1. Westborough

Fewer than five firms date from before 1950, so the timeline starts with the oldest firms before 1990.

Older than you

Live tool

Move the slider to a year. Two live counts, scoped to this industry.

1990

US cybersecurity firms date from before 1990

were entered in 1990

Sole traders or corporations: how they are organised

One in 127 US cybersecurity firms work as sole traders, against 5% of all US companies. Nine in ten are corporations and LLCs.

Sole traders270.8%
Partnerships210.6%
Corporations and LLCs2,91985%
No form on record or other45913%

Single-site: 89%
Head offices: 235
Branches: 143

All US companies: 5% sole traders, 1% partnerships, 68% corporations and LLCs.

How reachable are they?

Cybersecurity firms are easier to reach than the average US company: 99% list a phone number and 98% a website.

Email2,583 75%
Phone3,394 99%
Website3,358 98%

Grey line: all US companies (email 15%, phone 42%, website 24%).

The full list with these fields is in our US company database.

How they compare

Next to related industries

There are 224 technology companies for every cybersecurity firm in the USA.

Industry	Firms	Website	1-4 staff
Technology Companies	768,947	28%	84%
Software Companies	430,966	25%	84%
IT Consultants	257,527	29%	85%
Security Companies	77,446	28%	84%
ISPs	4,034	95%	53%
Cybersecurity Companies	3,426	98%	66%

In other countries

The USA has more cybersecurity firms than the UK or India.

Country	Firms	Per 1,000 cos.
The USA	3,426	0.1
The UK	1,802	0.2
India	1,429	0.0

More countries →

Free sample: cybersecurity firms in North America

Newcomers in the USA in 2026

207 cybersecurity firms were entered in the US register so far in 2026, about one per working day, after 362 in 2025. The USA as a whole saw 2,970,531 new companies in 2026, so this industry takes <0.1% of the inflow.

2272022
3442023
3722024
3622025
2072026 so far

206 of this year's 207 are corporations and LLCs.

The biggest newcomers of 2026

The year is the register entry; an established firm that changes legal form appears as new.

1Canonsburg100 staff
2Victor65 staff
3Greenwood Village51 staff
4Mooresville35 staff
5Centerville20 staff

Frequently asked questions

How many cybersecurity companies are there in the USA?

There are 3,426 cybersecurity companies and cybersecurity firms in the USA in our data, counted on 21 October 2026. That is one in every 18,643 US companies.

Which is the largest cybersecurity firm in the USA?

Zscaler in San Jose, with 7,923 staff. By revenue Optiv Parent in Denver leads with $2.9 billion a year.

Which US city has the most cybersecurity companies?

New York, with 63, ahead of Houston (32), Atlanta (27), San Francisco (26) and San Antonio (25).

How many cybersecurity firms are there in New York?

63, which is <0.1% of all 732,093 New York companies and 60% above the national share.

How big is a typical cybersecurity firm?

Small. 69% of the 3,301 firms with a known headcount have one to four people; 132 have 50 or more. Most turn over between $100,000 and $500,000 a year.

Are US cybersecurity companies sole traders or companies?

One in 127 (27) are sole traders, 0.6% are partnerships and 85% (2,919) are corporations and LLCs.

How many cybersecurity firms started in 2026?

207 were entered in the US register so far in 2026, after 362 in 2025. 206 of them are corporations and LLCs.

What is the oldest cybersecurity firm in the USA?

Brown and Company in El Paso, 1917, followed by Sidechannel in Worcester (1953) and Key Source International in San Leandro (1956). 0 firms date from before 1900.

Which industry code covers cybersecurity companies?

Our platform counts them on the CompanyData industry label 113215.

Can I download the full list?

Yes. All 3,426 firms with address, phone, email, legal form, employees, revenue and founding year, as Excel, CSV or through the API.

Discover more: related industries, by city, in other countries

The lists closest to this one. Every industry and city in the USA is on the USA page.

Administrative and support

Companies in US cities

Europe

Cybersecurity Companies in the UK

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