These Welsh companies are engaged in in-house research and development, predominantly in manufacturing, higher education, and healthcare. Notable examples include Swansea University, a research-led institution with over 5,600 employees, and Prifysgol Cymru Y Drindod Dewi Sant, a dual-sector university. In manufacturing, IQE specializes in semiconductor wafers, while General Dynamics UK Limited focuses on defence solutions. Randox is a significant player in health diagnostics.
The list reveals a concentration of companies involved in advanced technology and specialized manufacturing. Medical equipment and biotechnology are well-represented, with firms like Flexicare Global and BBI Solutions. Several companies, such as Nuaire in clean air technology and Bisley in workplace furniture, demonstrate a long history, having been founded before the turn of the millennium.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Swansea University / Prifysgol Abertaweswansea.ac.uk
Research-led university offering excellent teaching, producing globally recognized research, and contributing to economic growth and community wellbeing. |
5,646 | |||
| 2 |
Prifysgol Cymru Y Drindod Dewi Sant / University of Wales Trinity Saint Daviduwtsd.ac.uk
A prestigious university in Wales, offering a dual-sector approach to education with a focus on benefiting learners, employers, and communities |
1,960 | |||
| 3 |
Randoxrandox.com
An international health diagnostics company offering a range of products including Biochip Array Technology, clinical chemistry analyzers, reagents, software, and biosciences portfolio |
1,100 | |||
| 4 |
Teledyne Qioptiqteledyne-ade.com
Designs and manufactures photonic products and solutions for various industries, including medical, aerospace, and research, with expertise from multiple integrated companies |
660 | |||
| 5 | 420 | ||||
| 6 |
General Dynamics UK Limitedgeneraldynamics.uk.com
A leading UK defence supplier with expertise in C4I communication solutions, armored fighting vehicles, tactical communications systems, and avionic systems for military aircraft |
417 | |||
| 7 |
BBI Solutionsbbisolutions.com
Global experts in immunoassay development & manufacturing, offering an extensive portfolio of diagnostic products to enhance quality of life |
335 | |||
| 8 |
Nuairenuaire.co.uk
A market-leading business specializing in clean air technology, designing and manufacturing efficient fans and ventilation systems since 1966 |
305 | |||
| 9 |
Oscar Mayer Group UKoscarmayer.co.uk
Making and developing retailer label prepared foods for top UK grocery retailers, committed to outstanding quality, value, and service for customers. |
291 | |||
| 10 |
Orangeboxorangebox.com
Specializing in furniture solutions for modern workplaces and hospitality settings, this company delivers global clients research-led designs tailored to their needs |
237 | |||
| 11 |
Flexicare Globalflexicare.com
A global provider of innovative medical devices with over 40 years of experience, supporting clinicians to enhance patient outcomes worldwide |
222 | |||
| 12 |
Bisleythebisleygroup.com
Design and manufacture innovative storage products tailored to meet the evolving needs of modern workplaces with extensive experience. |
205 | |||
| 13 |
Huntleigh Healthcarehuntleigh-diagnostics.com
A leading global provider of innovative medical equipment for healthcare professionals, specializing in vascular care, fetal monitoring, and patient monitoring solutions |
193 | |||
| 14 |
Siderise Groupsiderise.com
A company providing innovative insulation solutions for fire and acoustic applications internationally, with trusted products used in construction, building services, and other industries |
186 | |||
| 15 |
UnitBirwelcounitbirwelco.com
Design, manufacture, and maintenance of thermal equipment including flare systems, fired heaters, and heat exchangers for oil, gas, power, and pharmaceutical industries. |
149 | |||
| 16 |
What's Cooking? _UK (Prev. KK Fine Foods Ltd)kkfinefoods.com
An innovative and sustainable food manufacturer offering high-quality protein and vegetarian meal solutions for both food service and retail sectors |
121 | |||
| 17 |
HBI EuroCapshbieurocaps.com
EuroCaps is a contract manufacturer of softgel capsules and nutritional gummies for the supplement market, offering services from concept to finished goods |
114 | |||
| 18 |
CatSci Ltdcatsci.com
Innovative drug development partner offering services from candidate selection to product launch, utilizing critical technologies for safer, greener, and cost-effective therapeutics |
99 | |||
| 19 |
IrvinGQ庐irvingq.com
A leading manufacturer providing aerial delivery systems, naval decoy solutions, parachutes, and search & rescue equipment with over 100 years of industry experience |
86 | |||
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. | |||||
| 20 |
Penn Pharma, a PCI companypennpharm.co.uk
A leading pharmaceutical services company offering integrated drug development, clinical trial supply, manufacturing, and packaging services to the global healthcare industry |
77 | |||
| 21 |
Space Forgespaceforge.com
Global company leading the clean industrial revolution by harnessing space to develop reusable satellites for manufacturing super materials in space |
75 | |||
| 22 |
BCB International Ltdbcbin.com
A company developing innovative products to help armed forces, aid workers, and adventurers operate and survive in harsh environments, saving lives through innovation |
62 | |||
| 23 |
Wild Creations Ltdwild-creations.co.uk
Specializing in bespoke installations for Theme Parks, TV & Film, and Theatre, the company creates eye-catching displays for major events and clients, ensuring quality at every step |
54 | |||
| 24 |
Mypinpadmypinpad.com
A UK-based B2B SaaS company enabling secure mobile transactions globally, with bank-grade technology, partner collaborations, and focus on financial inclusion |
52 | |||
| 25 |
Axium Process Ltdaxiumprocess.com
An engineering house specializing in custom solutions for filtration systems, stainless steel fabrication, and hygienic design across diverse industries |
50 | |||
| 26 |
Porvair Sciences Ltdporvairsciences.com
Global manufacturer of consumables, porous plastics, and instruments for life science and analytical labs Providing high quality products for improved analysis and productivity |
46 | |||
| 27 |
Zip-Clip Limitedzip-clip.com
Manufacturer of suspension and bracing systems for HVAC, Electrical, Signage, and Seismic needs, offering innovative, high-quality products for safety and ease of use |
38 | |||
| 28 |
VCA Technologyvcatechnology.com
VCA analytics provides data analytics for businesses and organizations to understand people's behavior, enhance security, and reduce false alarms Deployed globally |
34 | |||
| 29 |
Marine Power Systems Ltd (MPS)marinepowersystems.co.uk
This company specializes in developing modular floating platforms for industrial scale offshore wind projects, enabling rapid deployment and harnessing ocean power |
33 | |||
| 30 |
ISCAiscaguard.com
Manufacturer of preservatives and additives for cosmetics, textiles, coatings, and aerospace industries with ISO accreditation, offering technical support and global distribution |
27 | |||
| 31 |
Bon Bon Buddies Ltdbonbonbuddies.com
A leading licensed brand novelty confectionery group in Europe, offering a wide range of character and distributor brand confectionery products |
26 | |||
| 32 |
SmallSparksmallspark.space
Specializing in efficient spacecraft design and payload integration processes to streamline operations and maximize the performance of space missions |
22 | |||
| 33 |
FAUN Trackway Limitedfauntrackway.co.uk
A company with over 75 years of experience in providing high-quality aluminum engineering solutions, including ground stabilisation trackways for military and civilian markets |
20 | |||
| 34 |
Prima Foods UK Ltdprimafoods.co.uk
A South Wales-based manufacturer of bakery mixes, home baking products, and meal components with a focus on innovation, sustainability, and gluten-free products |
13 | |||
| 35 |
Thalia Design Automationthalia-da.com
Venture-funded technology business providing analog/mixed signal design solutions for IC manufacturers and IP companies, with facilities in UK, India, and Germany |
13 | |||
| 36 |
Richards and Appleby Ltdrichardsandappleby.co.uk
A UK-based manufacturer of cosmetics and toiletries, offering a full range of beauty and personal care products with global distribution through various channels |
13 | |||
| 37 |
Corilla Plastics Group Ltdcorillaplastics.co.uk
A UK based rotational plastics company with 40 years of experience, offering custom plastic products with strict quality control and exceptional customer service |
11 | |||
| 38 |
RAVENOL UKravenol-direct.uk
Specializing in high-performance lubricants for Motorsport, R&D department creates innovative products exceeding manufacturer requirements, improving engine performance and efficiency worldwide |
4 | |||
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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 12, 2026.
More company lists in Wales
- The largest companies in Wales 570
- Manufacturers in Wales 74
- Multinational companies in Wales 69
- Retail chains in Wales 50
- Family-owned companies in Wales 36
- Financial services firms in Wales 35
- Financial Services companies in Wales 35
- Hardware manufacturers in Wales 32
- Food and Beverage Manufacturing companies in Wales 29
- SaaS companies in Wales 29
- Retail companies in Wales 28
- Public sector organisations in Wales 28
- Contract manufacturers in Wales 26
- Food and beverage companies in Wales 26
- Hotel and hospitality groups in Wales 26
The same list elsewhere in United Kingdom
- Companies with in-house R&D in the United Kingdom 1,930
- Companies with in-house R&D in England 1,703
- Companies with in-house R&D in Scotland 94
- Companies with in-house R&D in Northern Ireland 28
- Companies with in-house R&D in London 477
- Companies with in-house R&D in Cambridge 56
- Companies with in-house R&D in Oxford 39
- Companies with in-house R&D in Manchester 34
- Companies with in-house R&D in Nottingham 27