These are maritime transportation companies in the United Kingdom, ranging from large groups to mid-sized firms. They cover a broad spectrum of activities within the sector, including ship management, classification, brokering, and specialized services. Many of these companies are headquartered in London, indicating a concentration of maritime expertise in the capital.
V.Group is a partner in maritime activities, while Lloyd's Register provides engineering and technology services for critical infrastructures. Zodiac Maritime manages a diverse fleet of carriers, and Clarksons offers global maritime services including shipbroking and finance. Survitec Group Ltd. specializes in survival technology, and Princess Yachts designs luxury yachts. A notable pattern is the presence of several long-established companies, with many founded in the 19th century.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 | 5,889 | ||||
| 2 |
Lloyd's Registerlr.org
Provides professional engineering and technology services to improve safety and performance of critical infrastructures worldwide, supporting engineering research and education. |
5,881 | |||
| 3 |
Zodiac Maritimezodiac-maritime.com
A global ship operating company headquartered in London, managing a diverse fleet of bulk carriers, tankers, container ships, and car carriers with over 6,500 crew members |
2,257 | |||
| 4 |
Clarksonsclarksons.com
Global maritime services company offering shipbroking, research, finance, digital tools, port services, and green advisory services for smarter, sustainable shipping solutions |
1,991 | |||
| 5 |
Merchant Navy
Global maritime industry employing professional seafarers on commercial vessels to facilitate international trade across the world |
1,869 | |||
| 6 |
Survitec Group Ltd.survitecgroup.com
Global leader in survival technology providing liferafts, marine evacuation systems, offshore PPE, and critical safety solutions worldwide. |
1,425 | |||
| 7 |
Princess Yachtsprincessyachts.com
Design and manufacture luxury yachts with skilled craftsmanship, focusing on detailed perfection to deliver exceptional boating experiences. |
1,132 | |||
| 8 |
Maritime and Coastguard Agencylinktr.ee
This organization implements maritime safety policies in the UK, provides search and rescue services, inspects ships, certifies seafarers, and responds to pollution incidents |
1,056 | |||
| 9 |
CalMac Ferries Limitedcalmac.co.uk
An award-winning ferry operator serving 30 island destinations along the west coast of Scotland, carrying 5 million passengers annually |
798 | |||
| 10 |
Northern Marine Manning Services Ltdnmms.co.uk
A leading provider of high quality marine and offshore personnel, offering crew management services with a focus on safety and quality |
758 | |||
| 11 |
Northern Marine Groupnmg-stena.com
Providing reliable ship management and marine services with a focus on safety, quality, and efficient operation of diverse fleets worldwide. |
713 | |||
| 12 |
PD Portspdports.co.uk
Operate major UK ports and logistics centers, manage vessel traffic, support apprenticeships, and maintain supply chain efficiency across key locations. |
676 | |||
| 13 |
SSYssyglobal.com
140 years of experience as a trusted independent broking partner, shaping the industry with 500 experts globally, committed to moving maritime forward |
672 | |||
| 14 |
Braemarbraemar.com
Specializing in investment, chartering, and risk management advice for the shipping and energy industries, Braemar offers integrated services for sustainable returns |
598 | |||
| 15 |
LOCloc-group.com
Global consultancy with specialists worldwide offering expertise in shipping, renewables, oil & gas, and marine sectors for urgent and complex challenges |
534 | |||
| 16 |
HM Coastguardgov.uk
Responsible for initiating and coordinating all maritime search and rescue operations within the UK Maritime Search and Rescue Region |
531 | |||
| 17 |
Trinity Housetrinityhouse.co.uk
A maritime charity dedicated to safeguarding shipping and seafarers, providing education, support, and aids to navigation services for mariners' safety and welfare |
517 | |||
| 18 |
Norbulk Shippingnorbulkshipping.com
Ship management company established in 1982, serving ship owner clients worldwide with ISO certification, quality management systems, and proactive approach to industry |
506 | |||
| 19 |
Ambassador Cruise Lineambassadorcruiseline.com
A new British cruise line focused on authentic, sustainable experiences, with friendly, diverse staff creating a community at sea for guests |
438 | |||
| 20 |
Port of London Authoritypla.co.uk
A trust port operating along the River Thames, prioritizing safety, environmental protection, and promoting trade and travel for current and future stakeholders |
434 | |||
| 21 |
Briggs Marinebriggsmarine.com
A leading provider of marine and environmental services with 50 years of experience, specializing in port operations, subsea support, and vessel chartering Operations worldwide |
424 | |||
| 22 |
Navigator Gasnavigatorgas.com
A leading shipping company with the world's largest fleet of liquefied gas carriers, providing international transportation and distribution of LPG, petrochemical gases, and ammonia |
408 | |||
| 23 |
James Fisher and Sons plcjames-fisher.com
A leading provider of specialist services to marine, oil & gas, and high assurance industries worldwide, delivering solutions to technical challenges |
400 | |||
| 24 |
James Fisher Subtechjames-fisher.com
Specializing in marine support for construction, O&M, and decommissioning projects in oil & gas, civil, and marine industries worldwide |
398 | |||
| 25 |
S5 Agency World Ltds5agencyworld.com
Global shipping agency offering comprehensive services to charterers, ship managers, owners/operators worldwide with a focus on detail, transparency, and efficiency |
392 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 26 |
Global Ports Holdingglobalportsholding.com
One of the world's largest cruise port operators, managing numerous ports globally for both cruise and commercial purposes, serving millions of passengers annually |
365 | |||
| 27 |
OneOceanoneocean.com
provides a comprehensive digital platform integrating people, data, and workflows to enhance maritime operations, performance, and sustainability worldwide. |
357 | |||
| 28 |
Sperry Marinesperrymarine.com
Sperry Marine offers advanced navigation solutions for commercial and defense maritime industries, ensuring efficiency, reliability, and safety worldwide with over 100 years of expertise |
353 | |||
| 29 |
Institute of Marine Engineering, Science & Technology (IMarEST)imarest.org
Global membership organization for marine professionals, offering recognition and resources to sustainably manage and develop marine resources for humanity's benefit |
329 | |||
| 30 |
The Nautical Institutenautinst.org
International body promoting professionalism, best practices, and safety in maritime Offers services, accreditation for training schemes, and discounts on specialist maritime books for members |
326 | |||
| 31 |
Wightlink | Isle of Wight Ferrieswightlink.co.uk
A leading domestic ferry operator linking the Isle of Wight to the mainland, providing easy, frequent service for residents and holidaymakers |
325 | |||
| 32 |
Port of Doverportofdover.com
The company operates Europe's busiest ferry port, handling up to 拢122 billion of trade annually, supporting jobs, and undertaking major projects for port enhancement |
311 | |||
| 33 |
Howe Robinson Partnershowerobinson.com
A global shipbroking group providing comprehensive services in tanker, containership, dry bulk, LNG, and offshore markets, with over 330 employees worldwide |
300 | |||
| 34 |
Merchant Navyfleetship.com
A marine services company providing officer recruitment and manning services with locations in Mumbai and Lucknow, India |
225 | |||
| 35 |
W K Webster and Co Ltdwkwebster.com
With a legacy dating back to 1861, this company offers top-notch marine and transit claims consultancy services worldwide, focusing on quality and innovation |
185 | |||
| 36 |
Clyde Marine Training Ltdclydemarinetraining.com
Clyde Marine Training prepares and supports aspiring Merchant Navy Officers through comprehensive training programs, partnerships with industry leaders, and various support services |
183 | |||
| 37 |
Royal Institution of Naval Architectsrina.org.uk
International society for naval architects involved in ship design, construction, and repair worldwide Organizes conferences, training courses, and publishes technical journals for the maritime industry |
182 | |||
| 38 |
NYK Group Europe Ltdnykeurope.com
A global transportation company operating a large fleet of ocean vessels, planes, and trucks, with diverse shipping services and worldwide presence |
173 | |||
| 39 |
Spot Shipspot-ship.com
technology platform offering chartering solutions to increase profitability and reduce administrative workload for shipbroking businesses |
168 | |||
| 40 |
Orca AIorca-ai.io
Orca AI utilizes AI and computer vision to enhance navigation safety for merchant ships, providing real-time data and insights for better decision-making |
168 | |||
| 41 |
Hull Blyth Grouphull-blyth.com
A British-owned ship agency with 170 years experience in West Africa, offering a wide range of services in various sectors Proud member of Multiport Ship Agencies Network |
166 | |||
| 42 |
Northern Lighthouse Boardnlb.org.uk
This organization is the General Lighthouse Authority for Scotland and the Isle of Man, providing safety services to mariners through lighthouses and navigation aids |
164 | |||
| 43 |
E.A. Gibson Shipbrokersgibsons.co.uk
International Shipbroking House offering premium services for various shipping markets including Tanker, Dry Cargo, Offshore, Gas, and Sale & Purchase Also provides consultancy and research services |
164 | |||
| 44 |
MDL Marinas Ltdmdlmarinas.co.uk
Specialists in marina development and operations with over 40 years of experience, offering comprehensive in-house resources and expertise internationally |
163 | |||
| 45 |
Artemis Technologies Ltdartemistechnologies.co.uk
A global leader in advanced maritime design and technology, leveraging expertise from diverse industries to provide innovative solutions and products |
163 | |||
| 46 |
INTERCARGOintercargo.org
Representing dry cargo shipowners by providing a forum for discussing regulatory challenges, safety, environmental concerns, and promoting free and fair competition in the industry |
158 | |||
| 47 |
Lewmarlewmar.com
Global supplier of yacht equipment, including glass, roofing systems, winches, anchoring, thrusters, hatches, and portlights for boat builders worldwide Prioritizes innovation, reliability, and customer service |
153 | |||
| 48 | 150 | ||||
| 49 |
Njord Offshore Ltd.njordoffshore.com
The company operates crew transfer vessels tailored for offshore windfarms, offering services beyond typical vessels, all classed to DNV standards |
149 | |||
| 50 |
Clyde Marine Recruitmentclyderecruit.com
A leading provider of marine recruitment and crew management services worldwide Specializing in recruiting deck officers, engineers, ratings, and marine personnel |
146 | |||
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How this list is built
Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 15, 2026.
More company lists in the United Kingdom
- The largest companies in the United Kingdom 36,548
- Multinational companies in the United Kingdom 7,458
- Financial services firms in the United Kingdom 3,711
- Financial Services companies in the United Kingdom 3,696
- Retail chains in the United Kingdom 3,289
- Professional services firms in the United Kingdom 2,706
- Software Development companies in the United Kingdom 2,600
- Manufacturers in the United Kingdom 2,159
- Companies with in-house R&D in the United Kingdom 1,930
- IT Services and IT Consulting companies in the United Kingdom 1,722
- Retail companies in the United Kingdom 1,596
- IT services companies in the United Kingdom 1,583
- Hotel and hospitality groups in the United Kingdom 1,461
- Companies with a mobile app in the United Kingdom 1,411
- Consulting firms in the United Kingdom 1,298
- E-commerce companies in the United Kingdom 1,246
- Hardware manufacturers in the United Kingdom 1,239
- Family-owned companies in the United Kingdom 1,224
- Hospitality companies in the United Kingdom 1,204
- Critical infrastructure operators in the United Kingdom 1,195
- Wellness and Fitness Services companies in the United Kingdom 1,151
- Retail Apparel and Fashion companies in the United Kingdom 1,085
- Subscription businesses in the United Kingdom 1,077
- Distributors and wholesalers in the United Kingdom 1,061