Company lists · Data refreshed September 2026

Top 24 Oil and gas security companies based in London, United Kingdom

Name: Oil and gas security companies based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 14, 2026 300 companies tracked

RevenueBase identified 300 oil and gas security companies headquartered in London, United Kingdom as of September 2026 and tracks 83,894 professional contacts across them, including 695 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers oil and gas security companies 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 14, 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 14, 2026 86% judged on-target in blind review

300Companies

83,894Contacts tracked

695Verified emails

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The 24 largest oil and gas security companies based in London, United Kingdom

Ranked by team size

Top 24 of 300 oil and gas security companies based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 14, 2026. RevenueBase Smart Search rates how each company's information relates to oil and gas security companies: 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	G4s	Partial evidence	London, United KingdomHQ checked Sep 14, 2026	10001+	79,699 contacts →
	Partial evidence “G4S is a leading security and facility services company that provides proactive security services and cutting-edge smart technology to deliver tailored, integrated security…” Source: RevenueBase Database · checked Sep 14, 2026
2	CIS Security Limited	Partial evidence	London, United KingdomHQ checked Sep 14, 2026	1,001-5,000	919 contacts →
	Partial evidence “CIS Security is an independent security company equipped to help customers to solve the complex challenges in today’s digital, connected and regulated business world.” Source: RevenueBase Database · checked Sep 14, 2026
3	Ward Security	Partial evidence	London, United KingdomHQ checked Sep 14, 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 14, 2026
4	The Keyholding Company	Partial evidence	London, United KingdomHQ checked Sep 14, 2026	51-200	137 contacts →
	Partial evidence “The Keyholding Company are a tech-enabled mobile security services company, specialising in alarm response, mobile patrols, locks and unlocks, emergency and temporary guarding…” Source: RevenueBase Database · checked Sep 14, 2026
5	Hobark International Limited	Indirect evidence	London, United KingdomHQ checked Sep 14, 2026	201-500	113 contacts →
	Indirect evidence “Hobark International Limited (HIL) is an Integrated Services Company whose subsidiaries: DrillPet International Limited (DIL), Uniterm Nigeria Limited (UNL), UltiProc Nigeria…” Source: RevenueBase Database · checked Sep 14, 2026
6	Servoca Secure Solutions Limited	Partial evidence	London, United KingdomHQ checked Sep 14, 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 14, 2026
7	Lead Element Security Group	Partial evidence	London, United KingdomHQ checked Sep 14, 2026	51-200	75 contacts →
	Partial evidence “We are Veteran Owned, Veteran Operated Security company based in London (HQ), with operation nationwide.” Source: RevenueBase Database · checked Sep 14, 2026
8	KK Security & FM LTD	Partial evidence	London, United KingdomHQ checked Sep 14, 2026	201-500	71 contacts →
	Partial evidence “KK Security was established in 2014 with the goal of keeping people safe.” Source: RevenueBase Database · checked Sep 14, 2026
9	Saladin Security	Partial evidence	London, United KingdomHQ checked Sep 14, 2026	51-200	64 contacts →
	Partial evidence “Saladin is a security services and risk management company, operating mainly in complex and unstable regions of the world.” Source: RevenueBase Database · checked Sep 14, 2026
10	City Security Services Part Of City Group Security	Partial evidence	London, United KingdomHQ checked Sep 14, 2026	201-500	64 contacts →
	Partial evidence “City Security Services (CSS) have more than 25 years’ experience within the corporate security, public sector, education and social housing markets delivering manned guarding…” Source: RevenueBase Database · checked Sep 14, 2026
11	Black Diamond Security	Partial evidence	London, United KingdomHQ checked Sep 14, 2026	201-500	58 contacts →
	Partial evidence “Black Diamond Security - Safeguarding Your World.” Source: RevenueBase Database · checked Sep 14, 2026
12	UK Protection LTD	Partial evidence	London, United KingdomHQ checked Sep 14, 2026	201-500	45 contacts →
	Partial evidence “UK Protection is widely recognised as the premier supplier of security solutions to the Corporate, Jewellery and Luxury Retail industries across the UK.” Source: RevenueBase Database · checked Sep 14, 2026
13	Ak9 Security And FM Solutions LTD	Partial evidence	London, United KingdomHQ checked Sep 14, 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 14, 2026
14	BML Group	Partial evidence	London, United KingdomHQ checked Sep 14, 2026	11-50	37 contacts →
	Partial evidence “Founded in 2015, BML Group is one of the UK's leading Security & Facilities Management providers, delivering tailored solutions that enhance operational efficiency and safety.” Source: RevenueBase Database · checked Sep 14, 2026
15	Team Fusion LTD	Partial evidence	London, United KingdomHQ checked Sep 14, 2026	11-50	34 contacts →
	Partial evidence “Our elite teams offer bespoke, integrated security solutions that adapt and react to the evolving threat landscape.” Source: RevenueBase Database · checked Sep 14, 2026
16	Capstar	Partial evidence	London, United KingdomHQ checked Sep 14, 2026	51-200	30 contacts →
	Partial evidence “Capstar provides technology-enabled threat, risk and security services to private and corporate clients.” Source: RevenueBase Database · checked Sep 14, 2026
17	Priavo Security	Partial evidence	London, United KingdomHQ checked Sep 14, 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 14, 2026
18	The Portmarnock Group	Partial evidence	London, United KingdomHQ checked Sep 14, 2026	51-200	19 contacts →
	Partial evidence “The Portmarnock Group was built from years of experience, hard work and a genuine passion for doing security differently.” Source: RevenueBase Database · checked Sep 14, 2026
19	Line Security Services LTD	Partial evidence	London, United KingdomHQ checked Sep 14, 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 14, 2026
20	SSG Support Services Group LTD	Partial evidence	London, United KingdomHQ checked Sep 14, 2026	201-500	16 contacts →
	Partial evidence “SSG Support Services Group LTD is specialists in provision of Manned guarding Security Services, Door Supervision, Security Guarding, Out of Hours Support, Concierge, Front of…” Source: RevenueBase Database · checked Sep 14, 2026
21	Integrated Visual Protection Limited	Partial evidence	London, United KingdomHQ checked Sep 14, 2026	51-200	16 contacts →
	Partial evidence “Integrated Visual Protection Limited (IVP) is a privately owned Company, which has been established since 2002, providing all types of Fire and Security Services to a variety of…” Source: RevenueBase Database · checked Sep 14, 2026
22	Inline Risk Solutions LTD	Partial evidence	London, United KingdomHQ checked Sep 14, 2026	51-200	14 contacts →
	Partial evidence “Looking for security?” Source: RevenueBase Database · checked Sep 14, 2026
23	Amity Group INC Amity Security	Indirect evidence	London, United KingdomHQ checked Sep 14, 2026	51-200	14 contacts →
	Indirect evidence “The definition of Amity is peaceful and friendly, as such we aim to live up to our name.” Source: RevenueBase Database · checked Sep 14, 2026
24	Harris Security Services LTD	Partial evidence	London, United KingdomHQ checked Sep 14, 2026	51-200	13 contacts →
	Partial evidence “Harris Security Services was established with a clear and defined vision; to offer our clients an outstanding and unrivaled personalised service.” Source: RevenueBase Database · checked Sep 14, 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: oil and gas security companies. 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 oil and gas security companies.
Partial evidence: Its own public description names part of oil and gas security companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name oil and gas security companies. 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 24 of 300 oil and gas security companies based in London, United Kingdom

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Oil and gas security companies based in London, United Kingdom at a glance

As of Sep 14, 2026

0.8%Verified-email coverage

279.6Average contacts per company

11-50Median size (employees)

Sep 14, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

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 300 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 oil and gas security companies, 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 “oil and gas security companies”. 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 oil and gas security companies), 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 oil and gas security companies, 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, 695 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 14, 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 oil and gas security companies, 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 oil and gas security companies are there based in London, United Kingdom?

RevenueBase identified 300 oil and gas security companies 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?

G4s, headquartered in London, tops this list with the largest team on record.

Which city in the United Kingdom has the most oil and gas security companies?

London leads the United Kingdom with 300 headquartered companies, followed by Birmingham (29) and Manchester (27).

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 695 verified decision-maker contacts tracked across these 300 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 14, 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.