The companies with in-house R&D in Dublin are mostly large firms, with a notable presence in manufacturing, particularly pharmaceuticals and packaging, and in healthcare. For example, Eaton specializes in intelligent power management, Smurfit Westrock provides paper-based packaging solutions, ICON plc accelerates drug and device development, and Allergan discovers and delivers innovative medicines in various therapeutic areas.
A significant pattern among these companies is their global reach, with many operating across multiple countries. Another observation is the strong representation of companies in the pharmaceutical and biotechnology sectors, such as Jazz Pharmaceuticals, which focuses on innovative medicines for serious diseases, and Mallinckrodt Pharmaceuticals, specializing in specialty pharmaceuticals.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 | 51,011 | ||||
| 2 |
Smurfit Westrocksmurfitwestrock.com
Global provider of innovative paper-based packaging solutions with extensive operations, mills, and a large workforce across multiple countries. |
50,141 | |||
| 3 |
Smurfit Kappasmurfitwestrock.com
A global provider of sustainable paper-based packaging solutions, offering innovative products and expertise to drive success for customers worldwide |
48,000 | |||
| 4 |
ICON plciconplc.com
A global company founded in Ireland in 1990, specializing in accelerating the development of drugs and devices to save lives and improve quality of life |
35,001 | |||
| 5 |
Weatherfordweatherford.com
A global energy services company with 17,000 team members in 75 countries, providing solutions for the challenges of the energy industry |
29,301 | |||
| 6 |
Allerganabbvie.com
The company discovers and delivers innovative medicines in various therapeutic areas including immunology, oncology, neuroscience, eye care, and more |
9,833 | |||
| 7 |
Allegionallegion.com
Global leader in seamless access solutions for homes, businesses, schools, and institutions, specializing in securing people and assets around the door |
7,123 | |||
| 8 |
Perrigo Company plcperrigo.com
European Consumer Self-Care market top player, U.S. store brand over-the-counter and infant formula provider, offering trusted health and wellness solutions. |
5,088 | |||
| 9 |
Jazz Pharmaceuticalsjazzpharma.com
Global biopharmaceutical company focused on developing innovative medicines for serious diseases with limited treatment options to improve patient lives. |
3,643 | |||
| 10 |
Mallinckrodt Pharmaceuticalsmnk.com
Specializing in specialty pharmaceuticals, we develop, manufacture, and distribute innovative treatments for underserved patient populations across various medical fields |
3,400 | |||
| 11 |
St James's Hospital Dublinlinkin.bio
An academic teaching hospital delivering health treatment, care, and diagnosis while prioritizing education, research, and collaboration with a focus on quality and accountability |
2,788 | |||
| 12 | 2,720 | ||||
| 13 |
Alkermesalkermes.com
A neuroscience-focused company developing innovative medicines for psychiatric and neurological disorders, with a strong focus on patient well-being and community support |
2,397 | |||
| 14 |
St. Vincent's University Hospitalstvincents.ie
A leading academic teaching hospital providing acute, chronic, and emergency care across 50 medical specialties with international accreditation and pioneering patient care approaches |
2,000 | |||
| 15 |
MSD Irelandmsd-ireland.com
A leading biopharmaceutical company dedicated to inventing life-saving medicines and vaccines for challenging diseases, with a focus on research and improving health worldwide |
1,697 | |||
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. | |||||
| 16 |
Kepak Groupkepak.com
Irish-based meat processor with multiple facilities, producing fresh and value-added meat products for international foodservice and retail markets. |
1,409 | |||
| 17 |
FINEOSfineos.com
Leading provider of core systems for life, accident, and health insurers globally, offering end-to-end SaaS products for quote to claim administration, digital engagement, and analytics |
838 | |||
| 18 |
Devexpertsdevexperts.com
Devexperts specializes in developing complex software solutions for the Capital Markets industry, including trading platforms, market data products, and consulting services |
786 | |||
| 19 |
Fenergofenergo.com
Develops SaaS financial technology solutions for client lifecycle management, regulatory compliance, risk monitoring, operational efficiency, and digital transformation in financial institutions. |
695 | |||
| 20 |
APCapprocess.com
This company helps biopharma companies accelerate drug development with breakthrough science, lightning-fast process development, and radical collaboration to deliver for patients faster |
648 | |||
| 21 |
Vital Healthcaredccvital.com
A healthcare company specializing in sales, marketing, and distribution of pharmaceuticals, medical, surgical, and lab products with a focus on improving patient care |
571 | |||
| 22 |
Irish Blood Transfusion Servicegiveblood.ie
This organization supplies blood and blood products to hospitals in Ireland, while also encouraging individuals to become blood donors Visit their website for more information |
444 | |||
| 23 |
Lanas Healthcare Technology Ltdlanas.com
A healthcare technology company with over 25 products and services empowering 15 million professionals worldwide to provide exceptional patient care |
408 | |||
| 24 |
St. Patrick's Mental Health Servicesstpatricks.ie
Innovative mental health provider with deep roots in history, dedicated to offering quality care, promoting awareness, and safeguarding the rights of those with mental illness |
377 | |||
| 25 |
Openetlinkedin.com
A leading software and services provider to communications companies, specializing in digital and 5G business support systems for transformation and growth |
339 | |||
| 26 |
Felix Pharmaceuticals Pvt. Ltd.felixvet.com
A company specializing in pharmaceutical generics for veterinary medicine, with an HPRA approved facility in India and corporate offices in Ireland and India |
312 | |||
| 27 |
Trulifetrulife.com
An internationally-managed group creating and marketing niche medical devices in areas such as Pressurecare, Orthopaedics, Prosthetics, Breastcare, Seating Solutions, and Walking Aids |
289 | |||
| 28 | 249 | ||||
| 29 |
Ecocem Globalecocemglobal.com
Development and manufacturing of innovative cement technology reducing carbon emissions by 50%, enabling sustainable construction and industry decarbonization. |
196 | |||
| 30 |
CameraMaticscameramatics.com
Provides comprehensive solutions including 360-degree cameras and AI for collision avoidance, ensuring vehicle and team protection. Also offers a hardware-free employee mobility solution for travel expense and emissions tracking. |
139 | |||
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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 11, 2026.
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