61 UK it & security software companies are actively bought by businesses tracked on Cledara, led by Intruder (0.05% market share). Rankings reflect real purchasing data — what companies actually pay for — not analyst estimates. Updated monthly. Data as of 27 July 2026, 19:31 UTC.
Most popular UK it & security software companies
#
Product
Category
Founded
Employees
Funding
12-mo rank
1
Intruder
IT & Security
2,015
51-200 employees
Under $1M
-60
2
OnSecurity
IT & Security
2,018
51-200 employees
$5M - $10M
-930
3
Onfido
IT & Security
2,012
501-1,000 employees
$100M - $250M
4
PortSwigger
IT & Security
2,008
51-200 employees
+110
5
CyberSmart
IT & Security
2,016
51-200 employees
$10M - $25M
-377
6
Red Sift
IT & Security
1,001-5,000 employees
-143
7
Approov
IT & Security
2,001
11-50 employees
$5M - $10M
-23
8
Cloud 66
IT & Security
2,011
11-50 employees
$1M - $5M
-112
9
StatusCake
IT & Security
2,012
2-10 employees
+54
10
Bespin Labs
IT & Security
2,010
51-200 employees
+315
11
ScreenCloud
IT & Security
2,015
51-200 employees
+3
12
RotaCloud
IT & Security
2,013
51-200 employees
-147
13
Yoti
IT & Security
2,014
201-500 employees
$25M - $50M
+187
14
Zadarma
IT & Security
2,006
51-200 employees
-25
15
OSINT Industries
IT & Security
2,023
11-50 employees
16
Virtual Landline
IT & Security
1,996
11-50 employees
-656
17
Soho66
IT & Security
2,007
11-50 employees
-74
18
Total AV
IT & Security
2,016
51-200 employees
$1M - $5M
-411
19
Hack The Box
IT & Security
2,017
201-500 employees
$50M - $100M
20
Symprex
IT & Security
1,999
11-50 employees
21
Usecure
IT & Security
2,016
11-50 employees
22
Quackr.io
IT & Security
2,019
2-10 employees
23
RealVNC
IT & Security
2,002
51-200 employees
24
CCleaner
IT & Security
2,004
Self-employed
25
Egress
IT & Security
2,007
201-500 employees
$25M - $50M
26
TTNC
IT & Security
2,004
11-50 employees
27
Press Loft
IT & Security
2,006
11-50 employees
28
mSpy
IT & Security
2,003
51-200 employees
29
Fixed.net
IT & Security
2,018
11-50 employees
30
CloudM
IT & Security
2,008
201-500 employees
31
Virtually There
IT & Security
2,011
11-50 employees
32
Quatrix
IT & Security
2,006
501-1,000 employees
33
Sophos
IT & Security
1,985
5,001-10,000 employees
$50M - $100M
34
Academia
IT & Security
2,003
51-200 employees
35
Server Density
IT & Security
2,009
11-50 employees
$1M - $5M
36
CultureAI
IT & Security
2,015
11-50 employees
$10M - $25M
37
Prism Infosec
IT & Security
2,006
51-200 employees
38
Defense.com
IT & Security
2,023
51-200 employees
39
Setyl
IT & Security
2,020
11-50 employees
40
DataPlicitiy
IT & Security
2,008
51-200 employees
41
Doordeck
IT & Security
2,015
2-10 employees
42
AppCheck NG
IT & Security
51-200 employees
43
Babble
IT & Security
2,001
201-500 employees
$5M - $10M
44
Jigsaw24
IT & Security
1,992
201-500 employees
45
SOAX
IT & Security
2,019
51-200 employees
46
IPXO
IT & Security
2,021
51-200 employees
$1M - $5M
47
Qloaked
IT & Security
48
Trusted Proxies
IT & Security
2,010
2-10 employees
49
PrivateProxy
IT & Security
2,017
11-50 employees
50
Regery
IT & Security
11-50 employees
Showing the top 50 of 61 companies. The interactive page loads the full ranking, and the complete list is available as <a href="/api/export/startups/united-kingdom/it-and-security.csv">CSV</a> or <a href="/api/export/startups/united-kingdom/it-and-security.json">JSON</a>.
IT & Security Software subcategories in United Kingdom
Other companies in United Kingdom
Intruder — Intruder is a platform that offers continuous vulnerability management and attack surface monitoring, making it easy for
PortSwigger — PortSwigger products help to secure the web and speed up software delivery.
Red Sift — Red Sift is a cloud-based solution for configuring and managing DMARC, DKIM, and SPF protocols to protect against phishi
Zadarma — Zadarma is a telecommunications service that provides VoIP, virtual phone numbers across various countries, and PBX syst
OSINT Industries — OSINT Industries provides a platform that supports open-source intelligence by enabling searches through over 200 websit
Soho66 — Soho66 is a cloud-based business phone system provider offering virtual landlines, mobile and fax numbers, and a range o
Hack The Box — Hack The Box is a cloud-based platform offering over 1,200 hands-on cybersecurity labs and training scenarios for corpor
Symprex — Symprex is a platform that centralises the management of email signatures, disclaimers, mailbox permissions, and automat
Usecure — Usecure is a platform that helps organizations manage and improve employee cybersecurity awareness. Using automation, it
CCleaner — CCleaner is a utility platform designed for Windows, macOS, and Android operating systems. Developed by Piriform, it ser
TTNC — TTNC provides cloud-based telecommunications services including virtual phone numbers, VoIP, SMS, call tracking, fax, an
Fixed.net — Fixed.net is a WordPress and WooCommerce maintenance agency operating globally from offices in London, Sofia, and Bali.
CloudM — CloudM is a software company offering solutions for data migration, backup, automation, and archiving for Google Workspa
Quatrix — Quatrix is a managed cloud file transfer solution that automates secure file sharing, supports files of any size, and en
CultureAI — CultureAI is a Risk Management Platform . The platform is designed to help organisations take a data-driven approach to
Prism Infosec — PrismInfosec is a platform that provides cybersecurity services and solutions, including penetration testing, cybersecur
Setyl — Setyl is a cloud-based IT management platform that centralizes asset tracking, license management, and compliance monito
AppCheck NG — AppCheck provides a cloud-based vulnerability scanning platform that identifies security vulnerabilities across websites
Jigsaw24
Regery
Europe Registry
Cyber Vigilance
Cable Monkey
Krystal
Air Landline
This Can Happen
NetNerd
Network & VPN companies in United Kingdom
Babble — Babble Cloud provides cloud communications and IT services for businesses. The company offers products and services rela
SOAX
IPXO
Trusted Proxies
PrivateProxy
Lycamobile
Plusnet
Ping Technology Labs
Primed Proxies
Infrastructure companies in United Kingdom
Cloud 66 — Cloud 66 provides ops tools for developers to build, deliver, deploy, and manage any applications on any cloud or server
StatusCake — StatusCake is a platform that provides uptime monitoring, page speed monitoring, and more. The product offers a suite of
ScreenCloud — Screencloud is a digital signage software platform that allows users to effortlessly create, manage, and display content
RotaCloud — RotaCloud is software for managing staff schedules, attendance, and HR processes. It enables organizations to plan shift
Virtual Landline — Virtual Landline is a service offering virtual phone numbers and VoIP solutions, allowing users to make and receive call
Press Loft — Press Loft is a PR-focused platform that hosts digital press offices featuring high-resolution images, releases, and tre
Virtually There — Virtually There is a platform that offers virtual office services, including business addresses and mail handling, as we
Server Density — Server Density provides cloud-based infrastructure monitoring and server monitoring solutions to help businesses monitor
Identity & Access (IAM) companies in United Kingdom
Onfido — Onfido provides a digital identity verification solution that helps businesses confirm the identities of their customers
Approov — Approov is a mobile security platform that ensures only authorized mobile apps, running on unaltered devices, can access
Bespin Labs — Bespin Labs offers Google Workspace management solutions, enhancing user lifecycle management and data administration fo
Yoti — Yoti is a platform that allows individuals to securely share personal information with businesses and organizations.
Quackr.io — Quackr.io is a platform that enables users to access temporary phone numbers for receiving SMS messages. The platform pr
Doordeck — Doordeck is an access control aggregator. As a SaaS solution Doordeck enables NFC keyless entry for any access control s
Endpoint Security companies in United Kingdom
Total AV — TotalAV is an antivirus program offering malware detection and a range of security features. It offers real-time malware
mSpy — mSpy is a monitoring application that enables users to track activities on smartphones and computers. It allows monitor
Sophos — Sophos is a provider of comprehensive endpoint security solutions, including malware detection, exploit protection, and
Rising UK it & security software companies
OSINT Industries and Yoti show the strongest rank gains over the last 90 days.
OSINT Industries is the fastest-rising UK it & security software product this quarter.
The oldest is Sophos (founded 1985); the newest, OSINT Industries (2023).
Disclosed funding is led by Onfido ($100M - $250M); 15 of 61 have disclosed a round.
How United Kingdom compares globally
the United Kingdom accounts for 26.4% of the it & security software products tracked globally on Cledara (61 of 231).
The top UK product, Intruder, ranks #27 worldwide in the category.
Frequently asked questions
Who are the biggest UK it & security software companies?
Intruder, OnSecurity and Onfido lead the UK it & security software market in 2026, ranked by real adoption among companies on Cledara. Last updated 27 July 2026, 19:31 UTC.
How big is the UK it & security software market?
Within Cledara's dataset of real company purchases, 61 UK it & security software products are in active paid use, led by Intruder. This measures actual adoption — it is not a revenue TAM estimate.
Which UK it & security software companies are growing fastest?
OSINT Industries and Yoti show the strongest rank gains over the last 90 days among UK products in the category.
Where does this data come from?
From anonymized, aggregated purchasing data across companies that manage their software with Cledara — real payments, not surveys or web traffic. Updated monthly.