This selection of multinational companies in Northern Ireland highlights a mix of well-established institutions and technology-focused firms. Queen's University Belfast and Ulster University are prominent higher education providers, while Almac Group and Norbrook Laboratories are key players in pharmaceutical manufacturing. Kainos, FD Technologies, and EOS IT Solutions represent the strong IT services sector, contributing to a diverse economic landscape.
A notable pattern among these companies is the presence of several older, large organizations alongside younger technology companies. For instance, GRAHAM Group, founded in 1778, and McLaughlin & Harvey Ltd, established in 1853, are long-standing construction firms. In contrast, FinTrU, founded in 2013, specializes in financial services with a technology emphasis, showcasing a blend of traditional industries and modern innovation.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Queen's University Belfastqub.ac.uk
A renowned university with over 150 years of academic excellence, offering a wide range of degree programs and a strong research focus |
7,278 | |||
| 2 |
Ulster Universityulster.ac.uk
A multi-campus university in Northern Ireland, focused on research, teaching, employability, and industry collaboration to support student success and career readiness |
5,911 | |||
| 3 |
Almac Groupalmacgroup.com
Providing drug development, biomarker discovery, clinical trial supply, analytical services, and commercial manufacturing solutions for pharmaceutical and biotech companies worldwide. |
4,888 | |||
| 4 |
Kainoskainos.com
Utilizing technology to solve customer problems, Kainos transforms businesses and improves lives through Digital Services and the Workday Practice globally |
3,317 | |||
| 5 |
FD Technologiesfdtechnologies.com
A data-driven group that offers technology, services in capital markets, and predictive marketing solutions to drive organizations forward globally |
2,025 | |||
| 6 |
GRAHAM Groupgraham.co.uk
Specializes in delivering construction and development projects across the UK and Ireland, encompassing building, civil engineering, interior fit out, facilities management, and investment projects. |
1,933 | |||
| 7 |
EOS IT Solutionseosits.com
A family-run global technology company providing IT support services, innovative solutions, and international deployment for industry leaders in various domains worldwide |
1,733 | |||
| 8 |
Norbrook Laboratories ltdnorbrook.com
A global provider of veterinary pharmaceuticals for farm and companion animals, investing in manufacturing, laboratories, IT infrastructure, and offering diverse career opportunities |
1,069 | |||
| 9 |
FinTrUfintru.com
Specializing in KYC, Compliance, Risk, and Legal services, this company creates technology-based Client Lifecycle Management solutions for global financial institutions from various locations worldwide |
1,032 | |||
| 10 |
Liberty ITliberty-it.co.uk
A technology company backed by global giant Liberty Mutual Insurance, specializing in problem-solving, innovation, and customer interactions with a focus on employee well-being |
835 | |||
| 11 |
McLaughlin & Harvey Ltdmclh.co.uk
Construction, civil engineering, and fit-out projects and facilities management services for public and private clients across diverse sectors throughout the UK and Ireland. |
557 | |||
| 12 |
CDE Groupcdegroup.com
Leading company specializing in innovative materials washing equipment and services, delivering professional client experiences with award-winning management. |
536 | |||
| 13 |
Everwayeverway.com
Focus on unlocking and maximizing individual potential through personal development, empowerment, and growth strategies for every person. |
457 | |||
| 14 |
Totalmobile Ltdtotalmobile.com
Field service management organization providing technology to improve work and the lives of mobile workers, offering integrated solutions for operational excellence and ROI |
429 | |||
| 15 |
Westland Horticulture Ltdgardenhealth.com
Leading UK horticultural company offering innovative gardening products, wild bird care brands, and creative solutions to common gardening problems |
428 | |||
| 16 |
Dale Farm Ltddalefarm.com
Farmer-owned dairy cooperative producing award-winning dairy products from local milk for retail, foodservice, and export markets, with a focus on innovation and sustainability |
415 | |||
| 17 |
Brett Martin Ltdbrettmartin.com
Global supplier of specialist plastic products including plastic sheets, rooflight systems, and plumbing/drainage systems for construction, fabrication, print, and display sectors worldwide |
414 | |||
| 18 |
Eakin Healthcareeakinhealthcare.com
Family-owned healthcare company providing medical devices for ostomy, wound, respiratory, and surgical needs globally, including manufacturing and distribution services in multiple countries |
409 | |||
| 19 |
Omexom UKomexom.co.uk
Specializing in electricity generation, transmission, distribution, and substation design and construction to support the energy transition for clients in the UK and Ireland |
394 | |||
| 20 |
FG Wilsonfgwilson.com
Global supplier of diesel generator sets, with wide range of products from 68 to over 2,500 kVA, installed in over 150 countries, supported by dealer network worldwide |
376 | |||
| 21 |
Camlin Groupcamlingroup.com
A provider of innovative monitoring products and services improving safety, efficiency, resilience, and sustainability of electricity and rail networks |
366 | |||
| 22 |
PwC | Operate
A provider of operational and managed services solutions for clients, focusing on regulatory, risk, and compliance issues with expertise in technology |
357 | |||
| 23 |
Alternative Heat Ltdalternativeheat.co.uk
A market leader in offsite fabrication for MEP solutions, offering high-quality products through experienced design engineers and skilled trades personnel |
330 | |||
| 24 |
MJM Marinemjm-group.com
A global marine outfitting company based in Northern Ireland, specializing in crafting high-spec, bespoke spaces for leading cruise liner brands worldwide |
320 | |||
| 25 |
Kane Groupkanegroup.co.uk
Designing, developing, and delivering building-service solutions across the UK and Ireland with a focus on quality, health, and safety. |
302 | |||
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 |
Cubis Systemscubis-systems.com
Manufacture lightweight, high-strength composite plastic systems for underground infrastructure including access chambers, cable protection, and sealing accessories. |
244 | |||
| 27 |
AROUND NOON.aroundnoon.com
An award-winning food manufacturer specializing in food-to-go, serving blue-chip clients across various sectors with high-quality products delivered daily |
243 | |||
| 28 |
Haldane Fisher NIhaldane-fisher.com
Leading independent supplier to construction industry in UK and Ireland, offering building materials, plumbing products, home improvement items, and engineered timber solutions |
235 | |||
| 29 |
DV8fashiondv8fashion.com
A popular UK and Ireland-based fashion retailer with over 50 stores and an online platform offering a wide range of clothing and footwear brands since 1994 |
228 | |||
| 30 |
Mannokmannokbuild.com
Manufacturing premium building materials including thermal blocks, cement, roof tiles, insulation and precast concrete while providing technical support and sustainable construction solutions. |
203 | |||
| 31 |
STATSportslinktr.ee
A leading sports technology company developing wearable monitoring devices for athletes worldwide, used by elite teams in various sports |
193 | |||
| 32 |
Grant Thornton (NI) LLPgrantthorntonni.com
A growing professional services firm offering innovative solutions to business challenges with a focus on long-term relationships and core values |
190 | |||
| 33 |
Murdock Builders Merchantsmurdockbuildersmerchants.com
Supplier of building materials and timber with multiple branches across Ireland, supporting home and garden construction and renovation projects. |
188 | |||
| 34 |
Ulster Carpetsulstercarpets.com
Leading carpet manufacturer designing high-tech, prestigious carpets for discerning clients worldwide Headquarters in Northern Ireland with global sales offices and design studios |
184 | |||
| 35 |
H & J Martin Limitedhjmartin.co.uk
A construction company with over 175 years of experience, specializing in asset management, construction, and fit out services within Ireland |
183 | |||
| 36 |
Lowe Rental - Refrigeration and Catering Specialistslowerental.com
Supplier of energy-efficient refrigeration, catering equipment, cold rooms, and temporary kitchens with worldwide delivery, installation, and maintenance services. |
181 | |||
| 37 |
Lagan Specialist Holdingslaganscg.com
Undertakes specialist contracting activities including Aviation & Infrastructure, Piling, Operations and Maintenance, Facilities Management, Fit Out, civil engineering, and building projects globally. |
175 | |||
| 38 |
Ryobi Aluminium Casting (UK) Ltdryobi.co.uk
Manufacturer of high-quality aluminium automotive components, part of the Ryobi Group, aiming to be the top die casting company in Europe |
158 | |||
| 39 |
Egis in Irelandegis-group.com
Leading consulting engineers in Ireland providing high quality and innovative designs in civil, environmental, structural, and transportation sectors, now part of Egis Group |
152 | |||
| 40 |
Uformuform.co.uk
A leading manufacturer and distributor of doors and accessories for the kitchen, bedroom, and furniture trade in the UK and Ireland |
144 | |||
| 41 |
Belfast International Airportbelfastairport.com
Northern Ireland's principal airport serving over 70 domestic and international destinations, with a range of customer airlines, cargo services, and car parks |
132 | |||
| 42 |
Cooneen Groupcooneengroup.com
Group of companies designing and supplying character nightwear, military clothing, body armour, and workwear with strong global supply chains. |
129 | |||
| 43 |
Elite Electronic Systems Ltdelite.tech
Leading provider of Sub-Contract Electronic Manufacturing Services for various industries, adhering to quality standards, with state-of-the-art equipment and flexible scheduling |
117 | |||
| 44 |
Prestige Underwritingprestigeunderwriting.co.uk
A trusted MGA since 1997, specializing in creating bespoke standard and non-standard insurance products for brokers through partnership and innovation |
116 | |||
| 45 |
Crust & Crumbcrust-crumb.com
Leading Irish manufacturer of a wide range of dough-based products, specializing in private-label pizza bases, topped pizzas, garlic breads, wraps, and flatbreads |
114 | |||
| 46 |
MiFinitymifinity.com
A global payments provider offering cost-effective and secure payment solutions for online gaming, travel, Forex, and eCommerce sectors worldwide |
113 | |||
| 47 |
Fern Softwarefernsoftware.com
A global provider of banking software for inclusive financial institutions, offering solutions for improved operations, product development, and community support |
110 | |||
| 48 |
JP Corryjpcorry.com
A leading builders' merchant in Northern Ireland, offering a wide range of building materials, washroom solutions, and expert advice to trade and DIY customers |
109 | |||
| 49 |
DELI LITES IRELANDdelilites.com
A company specializing in human resources services and solutions, with a focus on recruitment, training, and development for businesses Contact: humanresources@delilitescom |
102 | |||
| 50 |
Copius Groupcopiusgroup.com
Provides comprehensive electrical, mechanical, and construction services for offshore and onshore projects, focusing on power, renewables, oil & gas, and critical infrastructure globally. |
96 | |||
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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 12, 2026.
More company lists in Northern Ireland
- The largest companies in Northern Ireland 354
- Manufacturers in Northern Ireland 48
- Retail chains in Northern Ireland 40
- Software Development companies in Northern Ireland 30
- Companies with in-house R&D in Northern Ireland 28
- Retail companies in Northern Ireland 27
- Family-owned companies in Northern Ireland 27
- Financial services firms in Northern Ireland 26
- Construction companies in Northern Ireland 26
- Food and Beverage Manufacturing companies in Northern Ireland 25
The same list elsewhere in United Kingdom
- Multinational companies in the United Kingdom 7,458
- Multinational companies in Scotland 248
- Multinational companies in Wales 69
- Multinational companies in London 3,652
- Multinational companies in Manchester 163
- Multinational companies in Birmingham 78
- Multinational companies in Glasgow 69
- Multinational companies in Cambridge 67
- Multinational companies in Leeds 67
- Multinational companies in Edinburgh 55
- Multinational companies in Milton Keynes 53
- Multinational companies in Reading 42
- Multinational companies in Bristol 41
- Multinational companies in Aberdeen 39
- Multinational companies in Oxford 37
- Multinational companies in Belfast 35
- Multinational companies in Nottingham 34
- Multinational companies in Coventry 30
- Multinational companies in Leicester 29
- Multinational companies in Newcastle upon Tyne 27
- Multinational companies in Watford 27
- Multinational companies in Liverpool 26
- Multinational companies in Sheffield 26