# 50 leading companies with in-house R&D in Ireland

Tamtam tracks 120 companies with in-house R&D headquartered in Ireland. This list ranks the 50 largest by number of employees on LinkedIn, led by Johnson Controls, Eaton and Smurfit Westrock. Their median headcount is 1,697. Half of them were founded in 1987 or later. The most common headquarters are Dublin (21), Cork (3) and Galway (2).

This selection of large companies with in-house R&D in Ireland includes several global players in manufacturing and services. Among them are Johnson Controls, a leader in smart building solutions, and Eaton, which focuses on intelligent power management. Also present are Smurfit Westrock and Smurfit Kappa, both major providers of paper-based packaging, and TE Connectivity, specializing in connectivity and sensor solutions. ICON plc is highlighted for its role in accelerating drug development.

A notable characteristic of these companies is their diverse industry representation, ranging from industrial machinery and electrical manufacturing to biotechnology research and food and beverage services. The data indicates a concentration of headquarters in Dublin, with Cork, Galway, Naas, Dundalk, and Kilkenny also hosting significant operations. Most of these companies are large, well-established firms with substantial employee bases.

🇮🇪 Ireland · 50 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Johnson Controls](https://www.tamtam.ai/c/johnson-controls) (johnsoncontrols.com)<br>Global leader in transforming environments through smart, healthy, and sustainable buildings Offering innovative digital solutions for various industries worldwide | Industrial Machinery Manufacturing | 🇮🇪 Cork | 67,718 |  |
| 2 | [Eaton](https://www.tamtam.ai/c/eaton) (eaton.com)<br>Intelligent power management provider working towards a sustainable future by helping customers manage power, transition to renewable energy, and solve power management challenges globally | Appliances, Electrical, and Electronics Manufacturing | 🇮🇪 Dublin | 51,011 |  |
| 3 | [Smurfit Westrock](https://www.tamtam.ai/c/smurfit-westrock) (smurfitwestrock.com)<br>Global provider of innovative paper-based packaging solutions with extensive operations, mills, and a large workforce across multiple countries. | Packaging and Containers Manufacturing | 🇮🇪 Dublin | 50,141 |  |
| 4 | [Smurfit Kappa](https://www.tamtam.ai/c/smurfit-kappa) (smurfitwestrock.com)<br>A global provider of sustainable paper-based packaging solutions, offering innovative products and expertise to drive success for customers worldwide | Packaging and Containers Manufacturing | 🇮🇪 Dublin | 48,000 |  |
| 5 | [TE Connectivity](https://www.tamtam.ai/c/te-connectivity) (te.com)<br>A global leader in industrial technology manufacturing, specializing in connectivity and sensor solutions for various industries to create a safer, sustainable, and connected future | Appliances, Electrical, and Electronics Manufacturing | 🇮🇪 Galway | 41,478 |  |
| 6 | [ICON plc](https://www.tamtam.ai/c/icon-plc) (iconplc.com)<br>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 | Biotechnology Research | 🇮🇪 Dublin | 35,001 |  |
| 7 | [Weatherford](https://www.tamtam.ai/c/weatherford) (weatherford.com)<br>A global energy services company with 17,000 team members in 75 countries, providing solutions for the challenges of the energy industry | Oil and Gas | 🇮🇪 Dublin | 29,301 | 1987 |
| 8 | [Kerry](https://www.tamtam.ai/c/kerry) (kerry.com)<br>Provides taste and nutrition solutions to food, beverage, and pharma brands, supporting product innovation and consumer satisfaction worldwide. | Food and Beverage Services | 🇮🇪 Naas | 16,755 |  |
| 9 | [Cimpress](https://www.tamtam.ai/c/cimpress) (cimpress.com)<br>Cimpress plc invests in mass-customization businesses, providing personalized products to meet individual customer needs with near mass production efficiency | Technology, Information and Internet | 🇮🇪 Dundalk | 12,460 | 1995 |
| 10 | [Allergan](https://www.tamtam.ai/c/allergan) (abbvie.com)<br>The company discovers and delivers innovative medicines in various therapeutic areas including immunology, oncology, neuroscience, eye care, and more | Pharmaceutical Manufacturing | 🇮🇪 Dublin | 9,833 |  |
| 11 | [University College Cork](https://www.tamtam.ai/c/university-college-cork) (ucc.ie)<br>Established in 1845 as a part of Queen's University, now a founding member of National University of Ireland Offers higher education with rich heritage | Higher Education | 🇮🇪 Cork | 7,328 | 1845 |
| 12 | [Allegion](https://www.tamtam.ai/c/allegion-dublin) (allegion.com)<br>Global leader in seamless access solutions for homes, businesses, schools, and institutions, specializing in securing people and assets around the door | Appliances, Electrical, and Electronics Manufacturing | 🇮🇪 Dublin | 7,123 |  |
| 13 | [Perrigo Company plc](https://www.tamtam.ai/c/perrigo-company-plc) (perrigo.com)<br>European Consumer Self-Care market top player, U.S. store brand over-the-counter and infant formula provider, offering trusted health and wellness solutions. | Manufacturing | 🇮🇪 Dublin | 5,088 |  |
| 14 | [Glanbia](https://www.tamtam.ai/c/glanbia) (glanbia.com)<br>A global nutrition company creating better products, sustainable practices, and high-quality nutrition to help people live full, healthy lives | Food and Beverage Services | 🇮🇪 Kilkenny | 4,176 | 1997 |
| 15 | [Jazz Pharmaceuticals](https://www.tamtam.ai/c/jazz-pharmaceuticals) (jazzpharma.com)<br>Global biopharmaceutical company focused on developing innovative medicines for serious diseases with limited treatment options to improve patient lives. | Pharmaceutical Manufacturing | 🇮🇪 Dublin | 3,643 | 2003 |
| 16 | [Mallinckrodt Pharmaceuticals](https://www.tamtam.ai/c/mallinckrodt-pharmaceuticals) (mnk.com)<br>Specializing in specialty pharmaceuticals, we develop, manufacture, and distribute innovative treatments for underserved patient populations across various medical fields | Pharmaceutical Manufacturing | 🇮🇪 Dublin | 3,400 | 1867 |
| 17 | [Tyco SimplexGrinnell](https://www.tamtam.ai/c/tyco-simplexgrinnell) (tycosimplexgrinnell.com)<br>A global leader in fire protection, security, HVAC, building controls, and energy storage, delivering customized solutions to meet customers' needs | Security and Investigations | 🇮🇪 Cork | 3,232 |  |
| 18 | [Atlantic Technological University](https://www.tamtam.ai/c/atlantic-technological-university) (atu.ie)<br>A new Technological University in the West and North-West of Ireland, offering programs across multiple campuses and embracing innovation for the future | Higher Education | 🇮🇪 Donegal | 2,966 |  |
| 19 | [Kingspan Group](https://www.tamtam.ai/c/kingspan-group) (kingspan.com)<br>Global leader in high-performance insulation and building envelope solutions for construction, aiming to improve building performance and create a sustainable future | Wholesale Building Materials | 🇮🇪 Kingscourt | 2,910 | 1965 |
| 20 | [St James's Hospital Dublin](https://www.tamtam.ai/c/st-james-s-hospital-dublin) (linkin.bio)<br>An academic teaching hospital delivering health treatment, care, and diagnosis while prioritizing education, research, and collaboration with a focus on quality and accountability | Hospitals and Health Care | 🇮🇪 Dublin | 2,788 |  |
| 21 | [Horizon](https://www.tamtam.ai/c/horizon-dublin) (amgen.com)<br>Merged into Amgen and currently maintains an inactive social media presence without monitoring or active updates following the completed corporate acquisition. | Biotechnology Research | 🇮🇪 Dublin | 2,720 | 2008 |
| 22 | [Alkermes](https://www.tamtam.ai/c/alkermes) (alkermes.com)<br>A neuroscience-focused company developing innovative medicines for psychiatric and neurological disorders, with a strong focus on patient well-being and community support | Biotechnology Research | 🇮🇪 Dublin | 2,397 | 1987 |
| 23 | [St. Vincent's University Hospital](https://www.tamtam.ai/c/st-vincent-s-university-hospital) (stvincents.ie)<br>A leading academic teaching hospital providing acute, chronic, and emergency care across 50 medical specialties with international accreditation and pioneering patient care approaches | Hospitals and Health Care | 🇮🇪 Dublin | 2,000 | 1834 |
| 24 | [Teagasc](https://www.tamtam.ai/c/teagasc) (teagasc.ie)<br>This organization provides research, advisory, and training services to the agriculture and food industry, as well as rural communities in Ireland | Research Services | 🇮🇪 Carlow | 1,760 | 1988 |
| 25 | [MSD Ireland](https://www.tamtam.ai/c/msd-ireland) (msd-ireland.com)<br>A leading biopharmaceutical company dedicated to inventing life-saving medicines and vaccines for challenging diseases, with a focus on research and improving health worldwide | Pharmaceutical Manufacturing | 🇮🇪 Dublin | 1,697 |  |
| 26 | [Kepak Group](https://www.tamtam.ai/c/kepak-group) (kepak.com)<br>Irish-based meat processor with multiple facilities, producing fresh and value-added meat products for international foodservice and retail markets. | Food and Beverage Manufacturing | 🇮🇪 Dublin | 1,409 | 1981 |
| 27 | [IPL](https://www.tamtam.ai/c/ipl-640430) (iplschoeller.com)<br>A top packaging provider offering sustainable solutions for various industries including food, consumer, agriculture, logistics, and the environment | Plastics Manufacturing | 🇮🇪 Dublin 2 | 1,208 | 2005 |
| 28 | [AMCS Group](https://www.tamtam.ai/c/amcs-group) (amcsgroup.com)<br>Global leader in integrated software and vehicle technology for environmental, waste, recycling, and EHSQ industries, improving efficiency, margins, and customer service | Environmental Services | 🇮🇪 Ballysimon | 1,165 | 2003 |
| 29 | [Tirlán](https://www.tamtam.ai/c/tirlan) (tirlan.com)<br>A world-class food and nutrition business with a diverse portfolio of products for consumer, agri, and international markets, focusing on sustainability and innovation | Food and Beverage Services | 🇮🇪 Kilkenny | 1,095 |  |
| 30 | [Anord Mardix](https://www.tamtam.ai/c/anord-mardix) (anordmardix.com)<br>Global leader in critical power distribution and protection, offering bespoke solutions and innovative products Part of a $24B diversified manufacturer | Appliances, Electrical, and Electronics Manufacturing | 🇮🇪 Dundalk | 1,074 |  |
| 31 | [Technological University of the Shannon](https://www.tamtam.ai/c/technological-university-of-the-shannon) (tus.ie)<br>Higher education institution with six campuses across Ireland, providing diverse academic programs and vibrant student experiences to over 14,000 students. | Higher Education | 🇮🇪 Ireland | 1,020 | 2021 |
| 32 | [Maynooth University](https://www.tamtam.ai/c/maynooth-university-maynooth) (maynoothuniversity.ie)<br>A research-intensive university in Ireland focused on commercialization, enterprise, and social responsibility Offers modern facilities for collaborative research and business incubation | Research Services | 🇮🇪 Maynooth | 1,007 | 1795 |
| 33 | [FINEOS](https://www.tamtam.ai/c/fineos) (fineos.com)<br>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 | Software Development | 🇮🇪 Dublin | 838 | 1993 |
| 34 | [Creganna Medical](https://www.tamtam.ai/c/creganna-medical) (te.com)<br>A global leader in designing and manufacturing access & delivery devices for minimally invasive medical therapies with a reputation for industry innovation and quality | Medical Equipment Manufacturing | 🇮🇪 Galway | 790 | 1980 |
| 35 | [Devexperts](https://www.tamtam.ai/c/devexperts) (devexperts.com)<br>Devexperts specializes in developing complex software solutions for the Capital Markets industry, including trading platforms, market data products, and consulting services | Software Development | 🇮🇪 Dublin | 786 | 2002 |
| 36 | [Wrightbus](https://www.tamtam.ai/c/wrightbus) (wrightbus.com)<br>A family-run business manufacturing iconic electric buses, leading the way in zero-emission transportation with innovative solutions and environmental awareness | Motor Vehicle Manufacturing | 🇮🇪 Ballymena | 785 | 1946 |
| 37 | [Moog Controls Corporation (Philippine Branch)](https://www.tamtam.ai/c/moog-controls-corporation-philippine-branch) (moog.com)<br>A worldwide designer and integrator of precision motion control products and systems for various industries, with a strong focus on culture and integrity | Aviation and Aerospace Component Manufacturing | 🇮🇪 Baguio City | 779 | 1984 |
| 38 | [Aerogen](https://www.tamtam.ai/c/aerogen) (aerogen.com)<br>Aerogen innovates aerosol drug delivery to improve respiratory care, patient outcomes, and healthcare provider efficiency, focusing on safety and effectiveness | Medical Equipment Manufacturing | 🇮🇪 Lower Dangan | 698 | 1997 |
| 39 | [Fenergo](https://www.tamtam.ai/c/fenergo) (fenergo.com)<br>Develops SaaS financial technology solutions for client lifecycle management, regulatory compliance, risk monitoring, operational efficiency, and digital transformation in financial institutions. | Financial Services | 🇮🇪 Dublin | 695 |  |
| 40 | [Limerick Institute of Technology](https://www.tamtam.ai/c/limerick-institute-of-technology) (lit.ie)<br>Offers higher education across five campuses and a learning center, providing courses from certificate to PhD levels, including craft apprenticeships and adult education. | Higher Education | 🇮🇪 Limerick | 694 |  |
| 41 | [Glen Dimplex](https://www.tamtam.ai/c/glen-dimplex) (glendimplex.com)<br>Manufacturing heating, ventilation, flame, precision cooling, and consumer appliances with innovative solutions to improve everyday life and energy efficiency. | Appliances, Electrical, and Electronics Manufacturing | 🇮🇪 Cloghran | 664 |  |
| 42 | [Bimeda](https://www.tamtam.ai/c/bimeda) (bimeda.com)<br>An international veterinary pharmaceutical company with manufacturing facilities in multiple countries, offering high-quality products worldwide and focused on customer satisfaction | Veterinary | 🇮🇪 Tallaght | 661 | 1960 |
| 43 | [APC](https://www.tamtam.ai/c/apc-dublin) (approcess.com)<br>This company helps biopharma companies accelerate drug development with breakthrough science, lightning-fast process development, and radical collaboration to deliver for patients faster | Pharmaceutical Manufacturing | 🇮🇪 Dublin | 648 | 2011 |
| 44 | [Mary Immaculate College, Ireland](https://www.tamtam.ai/c/mary-immaculate-college-ireland) (mic.ul.ie)<br>An established university-level college providing education in liberal arts, early childhood care, and professional development programs with state-of-the-art facilities in Limerick | Higher Education | 🇮🇪 Limerick | 647 | 1898 |
| 45 | [Technological University of the Shannon, Athlone Campus](https://www.tamtam.ai/c/technological-university-of-the-shannon-athlone-campus) (tus.ie)<br>Ireland's new technological university with 14,000+ students on six campuses, offering vibrant student experiences in Athlone, Limerick, Thurles, Clonmel, and Ennis | Higher Education | 🇮🇪 Athlone | 617 |  |
| 46 | [Vital Healthcare](https://www.tamtam.ai/c/vital-healthcare) (dccvital.com)<br>A healthcare company specializing in sales, marketing, and distribution of pharmaceuticals, medical, surgical, and lab products with a focus on improving patient care | Hospitals and Health Care | 🇮🇪 Dublin | 571 | 1829 |
| 47 | [Chanelle Pharma](https://www.tamtam.ai/c/chanelle-pharma) (chanellepharma.com)<br>Ireland’s largest manufacturer of generic pharmaceuticals for human and animal health, with a global presence and ambitious plans for growth | Pharmaceutical Manufacturing | 🇮🇪 Loughrea | 559 | 1985 |
| 48 | [Mergon Group](https://www.tamtam.ai/c/mergon-group) (mergon.com)<br>Manufacturer of high-quality plastic components for automotive, medical, and industrial products, serving global brands with innovative design and sustainable solutions | Plastics Manufacturing | 🇮🇪 Castlepollard | 533 | 1981 |
| 49 | [Nearform](https://www.tamtam.ai/c/nearform) (nearform.com)<br>A team of engineers, designers, and strategists building digital capabilities and solutions for enterprises, modernizing organizations with innovative platforms and systems | IT Services and IT Consulting | 🇮🇪 Waterford | 497 | 2011 |
| 50 | [Munster Joinery](https://www.tamtam.ai/c/munster-joinery) (munsterjoinery.ie)<br>Large manufacturer of energy efficient windows and doors in Europe, with operations in Ireland, Northern Ireland, and the UK serving international markets | Construction | 🇮🇪 Ballydesmond | 452 | 1973 |

## 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 Ireland

- [The largest companies in Ireland](https://www.tamtam.ai/l/largest-companies-ireland) (1,769)
- [Multinational companies in Ireland](https://www.tamtam.ai/l/multinational-companies-ireland) (564)
- [SaaS companies in Ireland](https://www.tamtam.ai/l/saas-companies-ireland) (203)
- [Software Development companies in Ireland](https://www.tamtam.ai/l/software-development-companies-ireland) (176)
- [Retail chains in Ireland](https://www.tamtam.ai/l/retail-chains-ireland) (166)
- [Financial services firms in Ireland](https://www.tamtam.ai/l/financial-services-firms-ireland) (143)
- [Financial Services companies in Ireland](https://www.tamtam.ai/l/financial-services-companies-ireland) (143)
- [Professional services firms in Ireland](https://www.tamtam.ai/l/professional-services-firms-ireland) (126)
- [Manufacturers in Ireland](https://www.tamtam.ai/l/manufacturers-ireland) (125)
- [Critical infrastructure operators in Ireland](https://www.tamtam.ai/l/critical-infrastructure-operators-ireland) (118)
- [Companies with a mobile app in Ireland](https://www.tamtam.ai/l/companies-with-mobile-app-ireland) (99)
- [Public sector organisations in Ireland](https://www.tamtam.ai/l/public-sector-organisations-ireland) (88)
- [Retail companies in Ireland](https://www.tamtam.ai/l/retail-companies-ireland) (84)
- [Education providers in Ireland](https://www.tamtam.ai/l/education-companies-ireland) (83)
- [IT Services and IT Consulting companies in Ireland](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-ireland) (83)
- [IT services companies in Ireland](https://www.tamtam.ai/l/it-services-companies-ireland) (77)
- [Construction companies in Ireland](https://www.tamtam.ai/l/construction-companies-ireland) (70)
- [Healthcare providers in Ireland](https://www.tamtam.ai/l/healthcare-providers-ireland) (69)
- [Consulting firms in Ireland](https://www.tamtam.ai/l/consulting-firms-ireland) (65)
- [Family-owned companies in Ireland](https://www.tamtam.ai/l/family-owned-companies-ireland) (64)
- [Distributors and wholesalers in Ireland](https://www.tamtam.ai/l/distributors-and-wholesalers-ireland) (63)
- [Subscription businesses in Ireland](https://www.tamtam.ai/l/subscription-businesses-ireland) (62)
- [Hardware manufacturers in Ireland](https://www.tamtam.ai/l/hardware-companies-ireland) (61)
- [Government Administration companies in Ireland](https://www.tamtam.ai/l/government-administration-companies-ireland) (57)

## The same list elsewhere in Ireland

- [Companies with in-house R&D in Dublin](https://www.tamtam.ai/l/r-and-d-companies-dublin) (43)

## The same list elsewhere

- [Companies with in-house R&D in the world](https://www.tamtam.ai/l/r-and-d-companies-in-the-world) (34,346)
- [Companies with in-house R&D in Europe](https://www.tamtam.ai/l/r-and-d-companies-in-europe) (20,169)

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Source: https://www.tamtam.ai/l/r-and-d-companies-ireland