List of Cybersecurity Companies in the UK

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

Last updated 21 October 2026

There are 1,802 cybersecurity companies in the UK, one in every 4,903 UK companies. Most of them are small: four in five have one to four people, and only 68 firms employ 50 people or more. Four in five of all cybersecurity firms are based in London, South East, North West, East of England and West Midlands. Below you find the largest cybersecurity firms in the UK, the regions 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 UK company database or through the Companies House API.

1,802 companies indexed · Data counted on 21 October 2026

Companies1,8021 in4,903 UK companiesRegions12Largest regionLondon 1,027Sole traders1%Employees1-4 (80%)Revenue< $100K (53%)Email41%Phone71%Website96%

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A live view of all 1,802 cybersecurity firms, sorted by revenue. Narrow it by region, city, employee size, revenue, legal form or founding year, or search a firm by name.

Sophos LIMITEDSophos LIMITED

	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	Sophos LIMITED	Unitedkingdom	Abingdon	The Pentagon	Oxfordshire	OX14 3YP	sophos.*****	1987	$837,561,748	622	Corporation	71	02096520
2	Exclusive Networks LIMITED	Unitedkingdom	Alton	Alresford House	Hampshire	GU34 2QJ	exclusive-networks.*****	1994	$775,678,297	383	Corporation	88	02900798
3	Sophos Group LIMITED	Unitedkingdom	Canary Wharf	C/o Csc Cls UK Ltd	London	E14 5HU	sophos.*****	2015	$640,676,458	2,933	Corporation	71	09608658
4	Ncc Group PLC	Unitedkingdom	Spinningfields	Xyz Building, 2 Hardman Boulevard	Manchester, Greater Manchester	M3 3AQ	nccgroup.*****	1999	$322,422,068	2,140	Corporation	48	04627044
5	Ncc Group Security Services LIMITED	Unitedkingdom	Spinningfields	Xyz Building	Manchester, Greater Manchester	M3 3AQ	nccgroup.*****	1999	$171,334,466	650	Corporation	48	04474600
6	Cloudflare LIMITED	Unitedkingdom	Balham	6th Floor	London	SE1 7PB	cloudflare.*****	2013	$160,267,337	512	Corporation	21	08778322
7	Proofpoint LIMITED	Unitedkingdom	Caversham Heights	100 Brook Drive	Reading	RG2 6UJ	proofpoint.*****	2004	$115,710,424	520	Corporation	84	05087111
8	Lrqa LIMITED	Unitedkingdom	Marston Green	1 Trinity Park	Solihull, West Midlands	B37 7ES	lrqa.*****	1985	$107,977,350	852	Corporation	97	01879370
9	Ignition Technology LTD	Unitedkingdom	Farnborough	Cody Technology Park	Hampshire	GU14 0LX	ignition-technology.*****	2015	$102,814,739	53	Corporation	88	09380523
10	Sectigo LIMITED	Unitedkingdom	Finsbury	Exmouth House	London	EC1R 0JH	sectigo.*****	2000	$97,123,000	225	Corporation	19	04058690
11	Orange Cyberdefense UK LIMITED	Unitedkingdom	Barming	Securedata House	Kent	ME16 9NT	orangecyberdefense.*****	2002	$94,930,588	191	Corporation	2	04365896
12	Ncc Group Corporate LIMITED	Unitedkingdom	Spinningfields	Xyz Building	Manchester, Greater Manchester	M3 3AQ	nccgroup.*****	2021	$87,997,123	261	Corporation	48	13247138
13	Entrust Security UK LIMITED	Unitedkingdom	Cambridge	1 Station Square	Cambridgeshire	CB1 2GA	entrust.*****	2018	$85,014,582	175	Corporation	60	11673268
14	Otp Holdings LTD	Unitedkingdom	Great Boughton	The Steam Mill	Cheshire West and Chester	CH3 5AN	cyberiam.*****	2024	$73,212,331	1,072	Corporation	4	15802080
15	Nomios UK&I LIMITED	Unitedkingdom	Chineham	2 Elmwood	Hampshire	RG24 8WG	nomios.*****	2006	$66,515,319	75	Corporation	110	05787755
16	Integrity360 LIMITED	Unitedkingdom	Monument-aldgate-fenchurch Street-tower Hill	11 Ironmonger Lane	London	EC2V 8EY	integrity360.*****	1998	$60,969,393	184	Corporation	21	03538529
17	Trend Micro (UK) LIMITED	Unitedkingdom	Holborn-strand-covent Garden	Podium Level (east) 2 Kingdom Street	London	W2 6BD	trendmicro.*****	1999	$56,982,761	138	Corporation	56	03698292
18	Mass Consultants LIMITED	Unitedkingdom	Saint Neots	Enterprise House	Cambridgeshire	PE19 6BN	mass.*****	1983	$56,717,670	308	Corporation	26	01705804
19	Qualys LIMITED	Unitedkingdom	Caversham Heights	100 Brook Drive Green Park	Reading	RG2 6UJ	qualys.*****	2015	$55,427,774	46	Corporation	21	04069874
20	Kocho Holdings LIMITED	Unitedkingdom	Cardiff	4th Floor	Cardiff	CF10 3FD	kocho.*****	2012	$54,676,674	260	Corporation	16	08279426
21	Kocho Group Holdings LIMITED	Unitedkingdom	Cardiff	4th Floor	Cardiff	CF10 3FD	kocho.*****	2021	$54,676,674	260	Corporation	16	13168305
22	Saepio Solutions LIMITED	Unitedkingdom	Halton	Hensel Electric Ltd	Buckinghamshire	HP12 3FU	saepio.*****	2016	$51,520,298	69	Corporation	6	10343084
23	Secureworks Europe LIMITED	Unitedkingdom	Abingdon	The Pentagon	Oxfordshire	OX14 3YP	secureworks.*****	2015	$49,886,130	88	Corporation	71	09546890
24	Bridewell Group Holdings LIMITED	Unitedkingdom	Reading	Thames Tower	Reading	RG1 1LX	bridewell.*****	2021	$48,870,103	268	Corporation	9	13256464
25	Iproov LIMITED	Unitedkingdom	Queen'S Park	14, Bank Chambers	London	SW1Y 6HR	iproov.*****	2011	$45,707,548	195	Corporation	4	07866563

Showing 25 of 1,109 companies

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Where in the UK?

London has the most cybersecurity companies in the UK (1,027), ahead of South East (173), North West (104), East of England (95) and West Midlands (84). Together the five hold four in five of them.

Regions by number of firms

12 UK regions have at least one cybersecurity firm; 11 have ten or more; 0 have exactly one. Click a region to set the lens.

How many cybersecurity companies are there in the UK?

Cybersecurity companies and cybersecurity firms in the UK

1,802

21 October 2026

There are 1,802 cybersecurity companies and cybersecurity firms in the UK in our data (21 October 2026). That is one in every 4,903 UK companies. About 4 new firms are entered in the register every week this year (148 so far in 2026).

Structure

Single-site firms: 1,658 92%
Head offices: 130
Branch offices: 14

Classification

Our platform counts them on the CompanyData industry label 113215.

1,656 of the 1,802 are Ltd and PLC (92%); 24 are sole traders. They come from Companies House and our UK register data, through the Companies House API.

Firm sizes in the UK

Of the 1,713 UK cybersecurity firms with a known headcount, 1,364 (80%) have one to four people, 104 have five to nine, 177 have ten to 49 and 68 have 50 or more. Most firms turn over under $100,000 a year (904, 53%).

EU size bands · the grey line shows all UK companies

Micro under 101,468 86%
Small 10 to 49177 10%
Medium 50 to 24963 4%
Large 250+5 0.3%

Grey line: the share among all UK companies (93% have under ten staff).

137

firms turn over more than $5 million a year; 91 more than $10 million.

148

firms were entered in 2026.

Cybersecurity firms in London

London has 1,027 cybersecurity companies and cybersecurity firms, <0.1% of all 1,945,804 London companies and 159% above the national share. Nine in ten London firms have fewer than five people; 20 have 50 or more. 131 new firms were entered in 2026, 4 date from before 1990.

Size

1-4 staff: 898 · 89%
5-9: 37 · 4%
10-19: 28 · 3%
20-49: 23 · 2%
50+: 20 · 2%

Legal form

Sole traders: 3 · 0.3%
Partnerships: 10 · 1.0%
Ltd and PLC: 1,003 · 98%
Other or none: 11 · 1%

Of the UK total: 57.0%
Of all London companies: <0.1%
Against the national share: 2.6×

New

Entered 2026 so far: 131
Entered 2025: 180
Of UK's 2026 entries: 88.5%

Old

Before 1990: 4 · 0.4%
1990 or later: 1,023 · 100%
Of UK's pre-1990 firms: 26.7%

Reachable

Email: 436 · 42%
Phone: 613 · 60%
Website: 1,013 · 99%

Revenue (USD)

Under $100K: 675 · 67%
$100K-$500K: 218 · 22%
$500K-$1M: 25 · 2%
$1M and more: 88 · 9%

Largest

1512
2448
3225
4180
5155

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Largest cybersecurity firms in the UK

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

Otp Holdings is the largest cybersecurity firm in the UK by headcount. 68 firms employ 50 people or more; 25 employ 100 or more.

1Cheshire West and Chester1,072 staff
2Solihull852 staff
3Manchester650 staff
4Oxfordshire622 staff
5London512 staff
6London448 staff
7Hampshire383 staff
8City of Edinburgh336 staff
9Cambridgeshire308 staff
10Reading254 staff

By employee size · 1,713 firms with a known headcount

Employees	Firms	%
1-4	1,364	80%
5-9	104	6%
10-19	89	5%
20-49	88	5%
50-99	43	3%
100-199	13	0.8%
200-499	7	0.4%
500-999	5	0.3%
1,000+	0	0%

80% have 1 to 4 people; 88 have 20 to 49; 68 have 50 or more.

By yearly revenue (USD)

Revenue	Firms	%
< $100K	904	53%
$100K-$500K	461	27%
$500K-$1M	75	4%
$1M-$5M	135	8%
$5M-$10M	46	3%
$10M-$50M	67	4%
$50M-$100M	15	0.9%
$100M-$500M	6	0.4%
$500M+	3	0.2%

53% under $100,000; 135 between $1M and $5M; 137 above $5M.

Sole traders or Ltd: how they are organised

One in seventy-five UK cybersecurity firms work as sole traders, against 7% of all UK companies. Nine in ten are Ltd and PLC.

Sole traders241%
Partnerships (partnerships and LLPs)664%
Ltd and PLC1,65692%
No form on record or other563%

Single-site: 92%
Head offices: 130
Branches: 14

All UK companies: 7% sole traders, 3% partnerships, 62% Ltd and PLC.

The oldest firms in the UK

Our data holds 0 UK cybersecurity firms from before 1900, 1 from before 1950 and 15 from before 1990.

1901
1. Hampshire
1967
1. Gloucestershire
1977
1. Kent
1982
1. The Scottish Borders
1983
1. Cambridgeshire
1984
1. Bridgend

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

UK cybersecurity firms date from before 1990

were entered in 1990

How reachable are they?

Cybersecurity firms are easier to reach than the average UK company: 71% list a phone number and 96% a website.

Email739 41%
Phone1,281 71%
Website1,729 96%

Grey line: all UK companies (email 15%, phone 30%, website 30%).

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

How they compare

Next to related industries

There are 187 technology companies for every cybersecurity firm in the UK.

Industry	Firms	Website	1-4 staff
Technology Companies	337,085	24%	92%
Software Companies	103,426	26%	90%
Video Games Companies	7,137	13%	94%
Website Designers	6,597	96%	87%
Security Companies	6,584	41%	84%
Cybersecurity Companies	1,802	96%	76%

In other countries

Only the USA has more cybersecurity firms than the UK.

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 Europe

Newcomers in the UK in 2026

148 cybersecurity firms were entered in the UK register so far in 2026, about 4 a week, after 212 in 2025. The UK as a whole saw 534,395 new companies in 2026, so this industry takes <0.1% of the inflow.

952022
1372023
1632024
2122025
1482026 so far

146 of this year's 148 are Ltd and PLC.

The biggest newcomers of 2026

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

1Gloucestershire32 staff
2London7 staff
3Hampshire7 staff
4Oxfordshire6 staff
5London3 staff

Frequently asked questions

How many cybersecurity companies are there in the UK?

There are 1,802 cybersecurity companies and cybersecurity firms in the UK in our data, counted on 21 October 2026. That is one in every 4,903 UK companies.

Which is the largest cybersecurity firm in the UK?

Otp Holdings in Cheshire West and Chester, with 1,072 staff. By revenue Sophos in Oxfordshire leads with $837.6 million a year.

Which UK region has the most cybersecurity companies?

London, with 1,027, ahead of South East (173), North West (104), East of England (95) and West Midlands (84).

How many cybersecurity firms are there in London?

1,027, which is <0.1% of all 1,945,804 London companies and 159% above the national share.

How big is a typical cybersecurity firm?

Small. 80% of the 1,713 firms with a known headcount have one to four people; 68 have 50 or more. Most turn over under $100,000 a year.

Are UK cybersecurity companies sole traders or companies?

One in seventy-five (24) are sole traders, 4% are partnerships and 92% (1,656) are Ltd and PLC.

How many cybersecurity firms started in 2026?

148 were entered in the UK register so far in 2026, after 212 in 2025. 146 of them are Ltd and PLC.

What is the oldest cybersecurity firm in the UK?

Gradian Systems in Hampshire, 1901, followed by Cristie Data in Gloucestershire (1967) and Transflo Instruments in Kent (1977). 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 1,802 firms with address, phone, email, legal form, employees, revenue and founding year, as Excel, CSV or through the API.

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

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

In the UK

Companies in UK cities

Americas

Cybersecurity Companies in the USA

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