Company lists · Data refreshed September 2026

Top 25 Homeland security contractors based in London, United Kingdom

Name: Homeland security contractors based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 197 companies tracked

RevenueBase identified 197 homeland security contractors headquartered in London, United Kingdom as of September 2026 and tracks 1,781 professional contacts across them, including 185 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers homeland security contractors headquartered in London, United Kingdom, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 28, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 28, 2026 86% judged on-target in blind review

197Companies

1,781Contacts tracked

185Verified emails

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The 25 largest homeland security contractors based in London, United Kingdom

Ranked by team size

Top 25 of 197 homeland security contractors based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to homeland security contractors: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Ward Security	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	1,001-5,000	419 contacts →
	Partial evidence “Ward is an award winning, privately owned business, providing bespoke risk and security solutions including protective security personnel, explosive search dogs, narcotic search…” Source: RevenueBase Database · checked Sep 28, 2026
2	Servoca Secure Solutions Limited	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	85 contacts →
	Partial evidence “At Servoca Secure Solutions, we take great pride in delivering a multi-service security business; offering a range of complementary products and services to both the public and…” Source: RevenueBase Database · checked Sep 28, 2026
3	Black Diamond Security	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	201-500	58 contacts →
	Partial evidence “Black Diamond Security - Safeguarding Your World.” Source: RevenueBase Database · checked Sep 28, 2026
4	Frankton Group LTD	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	48 contacts →
	Indirect evidence “In today’s complex threat environment, businesses, individuals, and organisations require trusted partners to provide the ultimate assurance that their assets are well protected.” Source: RevenueBase Database · checked Sep 28, 2026
5	Ak9 Security And FM Solutions LTD	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	501-1,000	43 contacts →
	Partial evidence “AK9 Security and FM Solutions offers comprehensive security solutions for businesses, governmental organizations, and residential areas.” Source: RevenueBase Database · checked Sep 28, 2026
6	Pathway Risk Management	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	40 contacts →
	Partial evidence “Pathway Risk Management delivers risk-led security and resilience solutions to organisations across the UK and internationally.” Source: RevenueBase Database · checked Sep 28, 2026
7	Othrys	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	33 contacts →
	Indirect evidence “Othrys is a global strategic and risk advisory firm founded in 2016.” Source: RevenueBase Database · checked Sep 28, 2026
8	Priavo Security	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	28 contacts →
	Partial evidence “Priavo Security Group is an established provider of comprehensive security risk management, dedicated to safeguarding individuals, information, assets, and reputation through…” Source: RevenueBase Database · checked Sep 28, 2026
9	Kiris Group	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	22 contacts →
	Partial evidence “Our Chartered Security Professionals seamlessly integrate discreet and effective security into lifestyles and organisations.” Source: RevenueBase Database · checked Sep 28, 2026
10	Anotherday	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	21 contacts →
	Partial evidence “AnotherDay is a new kind of defence & security consulting firm established to bring the power of effective intelligence and strategy to the challenge of safeguarding individuals…” Source: RevenueBase Database · checked Sep 28, 2026
11	Optimal Risk Group LTD	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	20 contacts →
	Indirect evidence “We optimise opportunities for our clients by managing their Risk & Resilience.” Source: RevenueBase Database · checked Sep 28, 2026
12	ALMA	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	18 contacts →
	Indirect evidence “Your Partner Delivering Risk-Proof Success: UK-Based Expertise, Delivering Global Risk Management.” Source: RevenueBase Database · checked Sep 28, 2026
13	Line Security Services LTD	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	17 contacts →
	Partial evidence “As a security services provider, protecting people and assets is our top priority.” Source: RevenueBase Database · checked Sep 28, 2026
14	Subrosa Group LTD	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	15 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 28, 2026
15	Excellentia Global	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	15 contacts →
	Partial evidence “Excellentia was established in 2006 to deliver specialist security and risk management solutions to clients in the United Kingdom.” Source: RevenueBase Database · checked Sep 28, 2026
16	Barham Protection Services BPS LTD	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	8 contacts →
	Partial evidence “Barham Protection Services (BPS Group) Ltd is a private limited company offering bespoke, professional, and discreet security services, providing former Crown servants and…” Source: RevenueBase Database · checked Sep 28, 2026
17	Alliance Risk Management Solutions LTD	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	7 contacts →
	Partial evidence “ALLIANCE RISK MANAGEMENT SOLUTIONS LTD is a Security and Investigations company located in 2 Eaton Gate, London, LONDON, United Kingdom.” Source: RevenueBase Database · checked Sep 28, 2026
18	Valkyrie GB Limited	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	6 contacts →
	Partial evidence “At Valkyrie, our mission is rooted in a commitment to safeguarding our clients with the highest standards of security and discretion.” Source: RevenueBase Database · checked Sep 28, 2026
19	Fourone Associates LTD	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	6 contacts →
	Partial evidence “FourOne Associates is an independent privately owned security company based in London, United Kingdom but with the capability to operate worldwide.” Source: RevenueBase Database · checked Sep 28, 2026
20	White Coast Security	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	5 contacts →
	Partial evidence “We Empower Organizations Worldwide with Cutting-Edge Security Solutions.” Source: RevenueBase Database · checked Sep 28, 2026
21	King Safety And Security LTD KSS	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	4 contacts →
	Partial evidence “King Safety and Security Ltd (KSS) is a leading specialist risk consultancy founded in 2014.” Source: RevenueBase Database · checked Sep 28, 2026
22	JMS Risk Solutions	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	4 contacts →
	Indirect evidence “JMS Risk Solutions is a specialised international consultancy dedicated to protecting complex organisations and their most critical assets, including people, property…” Source: RevenueBase Database · checked Sep 28, 2026
23	T-Risk	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	4 contacts →
	Indirect evidence “We HELP clients and travelers to identify potential physical risks to their business or travels and create and implement the most effective solutions.” Source: RevenueBase Database · checked Sep 28, 2026
24	state21.ltd	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	3 contacts →
	Partial evidence “Established in 2015, State 21 Ltd is a Security & Resilience management company delivering Expert Training, Specialist Consultancy and Tailored solutions in: Security Emergency…” Source: RevenueBase Database · checked Sep 28, 2026
25	Just Protect IT Limited	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	2 contacts →
	Partial evidence “We have experience in the realization of physical protection of the people(personal security) as well as preciousness in place or transport, and we have often been the bearers of…” Source: RevenueBase Database · checked Sep 28, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: homeland security contractors. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names homeland security contractors.
Partial evidence: Its own public description names part of homeland security contractors, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name homeland security contractors. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 197 homeland security contractors based in London, United Kingdom

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Homeland security contractors based in London, United Kingdom at a glance

As of Sep 28, 2026

10.4%Verified-email coverage

9.0Average contacts per company

1-10Median size (employees)

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

103

11-50

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured across the whole United Kingdom list rather than for London, so it is reported there. Company counts and contact totals on this page are exact for London, over 197 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among homeland security contractors, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in London, United Kingdom whose own description of what they do matches “homeland security contractors”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names homeland security contractors), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among homeland security contractors, and records with no verified work email. Companies headquartered outside London are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
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: Every listed company carries at least one verified work email, 185 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 28, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names homeland security contractors, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many homeland security contractors are there based in London, United Kingdom?

RevenueBase identified 197 homeland security contractors headquartered in London, United Kingdom as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Ward Security, headquartered in London, tops this list with the largest team on record.

Which city in the United Kingdom has the most homeland security contractors?

London leads the United Kingdom with 197 headquartered companies, followed by Reading (9) and Birmingham (8).

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 185 verified decision-maker contacts tracked across these 197 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 28, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 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 with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.