Company lists · Data refreshed September 2026

Top 25 Maritime systems integration companies based in the United Kingdom

Name: Maritime systems integration companies based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 384 companies tracked

RevenueBase identified 384 maritime systems integration companies headquartered in the United Kingdom as of September 2026 and tracks 10,554 professional contacts across them, including 2,794 with verified work emails. London is the largest hub.

This list covers maritime systems integration companies headquartered in the 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

384Companies

10,554Contacts tracked

2,794Verified emails

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The 25 largest maritime systems integration companies based in the United Kingdom

Ranked by team size

Top 25 of 384 maritime systems integration companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to maritime systems integration 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	Ultra Electronics Group	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	5,001-10,000	840 contacts →
	Indirect evidence “Ultra Electronics” Source: RevenueBase Database · checked Sep 28, 2026
2	SDSD	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	n/a	681 contacts →
	Partial evidence “SDSD - Supporting Maritime Professionals since 1983 Software innovation to the Maritime industry for more than 30 years.” Source: RevenueBase Database · checked Sep 28, 2026
3	Ambrey	Strong evidence	Hereford, United KingdomHQ checked Sep 28, 2026	51-200	435 contacts →
	Strong evidence “Always On"- We are at the heart of a diverse and interdependent global maritime eco-system.” Source: RevenueBase Database · checked Sep 28, 2026
4	Systems Engineering & Assessment LTD	Strong evidence	Beckington, United KingdomHQ checked Sep 28, 2026	201-500	392 contacts →
	Strong evidence “For over 60 years, SEA has delivered research, development, manufacturing, training, and support of complex maritime systems to the Royal Navy, international partners, and…” Source: RevenueBase Database · checked Sep 28, 2026
5	Oneocean	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	201-500	295 contacts →
	Partial evidence “Welcome to OneOcean: the ocean’s digital ecosystem and trusted partner for maritime businesses worldwide.” Source: RevenueBase Database · checked Sep 28, 2026
6	Sperry Marine	Partial evidence	New Malden, United KingdomHQ checked Sep 28, 2026	201-500	279 contacts →
	Partial evidence “Sperry Marine provides the commercial and defence maritime industry with Navigation Solutions that excel in efficiency, reliability and safety.” Source: RevenueBase Database · checked Sep 28, 2026
7	Apcl A&p Group Limited	Indirect evidence	Hebburn, United KingdomHQ checked Sep 28, 2026	501-1,000	240 contacts →
	Indirect evidence “A&P, part of the APCL Group, is a global marine engineering business which operates six dry docks across two strategic locations in the UK and delivers engineering excellence to…” Source: RevenueBase Database · checked Sep 28, 2026
8	Mactaggart Scott	Indirect evidence	Loanhead, United KingdomHQ checked Sep 28, 2026	201-500	210 contacts →
	Indirect evidence “A Scottish engineering company founded in 1898, MacTaggart Scott supports the Naval Defence and Marine market.” Source: RevenueBase Database · checked Sep 28, 2026
9	James Fisher Fendercare	Partial evidence	Norwich, United KingdomHQ checked Sep 28, 2026	1,001-5,000	204 contacts →
	Partial evidence “Shaping the future of maritime.” Source: RevenueBase Database · checked Sep 28, 2026
10	Nsslglobal	Indirect evidence	Redhill, United KingdomHQ checked Sep 28, 2026	201-500	187 contacts →
	Indirect evidence “NSSLGIobaI is a leading independent provider of satellite communications and IT solutions to marine, offshore and land-based users with innovation and customer service at the core…” Source: RevenueBase Database · checked Sep 28, 2026
11	Pole Star Global	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	183 contacts →
	Partial evidence “Pole Star Global is a maritime intelligence and technology solutions company, focusing on reducing risk and optimising trade efficiency.” Source: RevenueBase Database · checked Sep 28, 2026
12	Chess Dynamics	Partial evidence	Horsham, United KingdomHQ checked Sep 28, 2026	201-500	176 contacts →
	Partial evidence “Defence Leaders around the world work with Chess for market-leading, reliable defence systems.” Source: RevenueBase Database · checked Sep 28, 2026
13	Ninety Percent Of Everything 90poe	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	161 contacts →
	Partial evidence “Creating clarity, control and confidence for modern maritime operations with OpenOcean STUDIO.” Source: RevenueBase Database · checked Sep 28, 2026
14	Seatec	Indirect evidence	Glasgow, United KingdomHQ checked Sep 28, 2026	201-500	155 contacts →
	Indirect evidence “SeaTec provides a comprehensive range of services and products to meet the needs of the shipping, offshore and defence industries.” Source: RevenueBase Database · checked Sep 28, 2026
15	Orca AI	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	132 contacts →
	Partial evidence “Founded in 2018 by a team of Navy veterans, Orca AI, a maritime tech startup, empowers shipping companies to enhance their operational safety, efficiency, and sustainability…” Source: RevenueBase Database · checked Sep 28, 2026
16	SRT Marine Systems PLC	Strong evidence	Midsomer Norton, United KingdomHQ checked Sep 28, 2026	51-200	129 contacts →
	Strong evidence “SRT Marine Systems PLC is a global leader and innovator in maritime surveillance, intelligence, navigation safety and situational awareness.” Source: RevenueBase Database · checked Sep 28, 2026
17	Spectec	Partial evidence	Manchester, United KingdomHQ checked Sep 28, 2026	51-200	113 contacts →
	Partial evidence “SpecTec is a market-leading maritime technology company specialising in asset management software.” Source: RevenueBase Database · checked Sep 28, 2026
18	Viking Maritime Group	Partial evidence	Dover, United KingdomHQ checked Sep 28, 2026	51-200	111 contacts →
	Partial evidence “VIKING MARITIME GROUP is a British company with over 35 years experience, and is made up of the following 3 businesses: VIKING CREW - The leading Cruise, Superyacht, Specialist…” Source: RevenueBase Database · checked Sep 28, 2026
19	GAC UK	Indirect evidence	Grangemouth, United KingdomHQ checked Sep 28, 2026	201-500	97 contacts →
	Indirect evidence “GAC UK employs a team of over 350 specialists spread across 25+ branches throughout the UK, Ireland and Gibraltar.” Source: RevenueBase Database · checked Sep 28, 2026
20	Houlder Limited	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	91 contacts →
	Indirect evidence “Sea.” Source: RevenueBase Database · checked Sep 28, 2026
21	SMS Group Ship Repair Marine Interiors Marine Engineering SC Sqep	Indirect evidence	Southampton, United KingdomHQ checked Sep 28, 2026	51-200	89 contacts →
	Indirect evidence “Southampton Marine Services Ltd was established in 2004 and specialises in ship / work boat building, vessel repair and marine engineering; we trade in four markets - Commercial…” Source: RevenueBase Database · checked Sep 28, 2026
22	Seebyte	Strong evidence	Edinburgh, United KingdomHQ checked Sep 28, 2026	51-200	81 contacts →
	Strong evidence “SeeByte provides clients in the global maritime industry with the most advanced software solutions to enhance the capabilities of their uncrewed systems.” Source: RevenueBase Database · checked Sep 28, 2026
23	Ulysses Systems	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	78 contacts →
	Partial evidence “Ulysses Systems is a leading marine industry provider of enterprise software.” Source: RevenueBase Database · checked Sep 28, 2026
24	Cms2	Partial evidence	Portsmouth, United KingdomHQ checked Sep 28, 2026	201-500	76 contacts →
	Partial evidence “CMS2 has over 60-years’ experience of designing, developing, manufacturing and supporting atmosphere management and life support systems for submarines and other critical…” Source: RevenueBase Database · checked Sep 28, 2026
25	Kraken Technology Group	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	76 contacts →
	Partial evidence “High-performance dual-use composite littoral platforms for defence and commercial application in the maritime industry.” 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: maritime systems integration 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 maritime systems integration companies.
Partial evidence: Its own public description names part of maritime systems integration companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name maritime systems integration 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 25 of 384 maritime systems integration companies based in the United Kingdom

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Maritime systems integration companies based in the United Kingdom at a glance

As of Sep 28, 2026

26.5%Verified-email coverage

27.5Average contacts per company

1-10Median size (employees)

14.3%Largest-city concentration · London

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

205

11-50

112

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 384 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 maritime systems integration 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 the United Kingdom whose own description of what they do matches “maritime systems integration 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 maritime systems integration 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 maritime systems integration companies, and records with no verified work email. Companies headquartered outside United Kingdom 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, 2,794 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.

Maritime systems integration companies by metro

Maritime systems integration companies in London55

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 maritime systems integration 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 maritime systems integration companies are there based in the United Kingdom?

RevenueBase identified 384 maritime systems integration companies headquartered in the 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?

Ultra Electronics Group, headquartered in London, tops this list with the largest team on record.

Which city has the most maritime systems integration companies?

London leads with 55 headquartered companies, followed by Southampton (22) and Bristol (13).

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 2,794 verified decision-maker contacts tracked across these 384 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.