This list covers publicly traded companies based in Ireland, primarily featuring large multinational groups. Sectors represented include business consulting with Accenture, industrial technology with TE Connectivity, and packaging solutions from Smurfit Kappa and Smurfit Westrock. Other significant firms are Johnson Controls, a global leader in smart building solutions, and Eaton, which focuses on intelligent power management.
A notable pattern among these companies is their global reach, with many headquartered in Dublin but operating extensively across international markets. This indicates a strong presence of Irish-based entities with worldwide operations, particularly in industrial manufacturing, technology, and professional services.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Accentureaccenture.com
It provides professional services to businesses and governments, focusing on digital transformation, operational optimization, and enhancing citizen services globally. |
687,682 | |||
| 2 |
Johnson Controlsjohnsoncontrols.com
Global leader in transforming environments through smart, healthy, and sustainable buildings Offering innovative digital solutions for various industries worldwide |
67,718 | |||
| 3 | 51,011 | ||||
| 4 |
Smurfit Westrocksmurfitwestrock.com
Global provider of innovative paper-based packaging solutions with extensive operations, mills, and a large workforce across multiple countries. |
50,141 | |||
| 5 |
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 | |||
| 6 |
TE Connectivityte.com
A global leader in industrial technology manufacturing, specializing in connectivity and sensor solutions for various industries to create a safer, sustainable, and connected future |
41,478 | |||
| 7 |
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 | |||
| 8 |
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 | |||
| 9 |
Ryanair - Europe's Favourite Airlineryanair.com
Europe's largest airline group, offering over 3,000 daily flights to 225 airports, with a plan to carry 225m+ guests annually |
21,217 | |||
| 10 | 16,755 | ||||
| 11 |
Cimpresscimpress.com
Cimpress plc invests in mass-customization businesses, providing personalized products to meet individual customer needs with near mass production efficiency |
12,460 | |||
| 12 |
Flutter Entertainmentflutter.com
Global provider of sports betting, gaming, and entertainment, serving over 18 million customers worldwide through leading consumer brands Vision to be global online leader |
7,681 | |||
| 13 | 7,256 | ||||
| 14 |
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 | |||
| 15 |
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 | |||
| 16 |
Glanbiaglanbia.com
A global nutrition company creating better products, sustainable practices, and high-quality nutrition to help people live full, healthy lives |
4,176 | |||
| 17 |
Flutter Internationalcareers.flutterinternational.com
Global sports betting, gaming, and entertainment provider with innovative brands focused on championing play, empowerment, and teamwork for millions of customers worldwide |
4,076 | |||
| 18 |
DCC plcdccenergy.com
A global group providing solutions in energy, healthcare, and technology sectors through diverse businesses across 22 countries, driving long-term value creation |
3,820 | |||
| 19 |
Jazz Pharmaceuticalsjazzpharma.com
Global biopharmaceutical company focused on developing innovative medicines for serious diseases with limited treatment options to improve patient lives. |
3,643 | |||
| 20 | 3,251 | ||||
| 21 |
Kingspan Groupkingspan.com
Global leader in high-performance insulation and building envelope solutions for construction, aiming to improve building performance and create a sustainable future |
2,910 | |||
| 22 |
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 | |||
| 23 |
Origin Enterprises Plcoriginenterprises.com
Provides technically-led agricultural solutions promoting sustainable land use, empowering customers across multiple countries to maximize land potential. |
1,956 | |||
| 24 |
Dole plcdoleplc.com
The company grows, sources, packs, markets, and distributes fresh produce globally, focusing on quality, sustainability, and healthy eating from farm to fork. |
1,306 | |||
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| 25 |
Dalata Hotel Groupdalatahotelgroup.com
Bringing hospitality to hotels worldwide, Dalata focuses on caring for guests through unique experiences at their 53 locations in Ireland, UK, Germany, and the Netherlands |
1,020 | |||
| 26 |
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 | |||
| 27 |
Uniphar Groupuniphar.ie
Diversified healthcare services company operating in Ireland, UK, Europe, USA, and APAC, providing a wide range of healthcare-related activities |
825 | |||
| 28 |
Moog Controls Corporation (Philippine Branch)moog.com
A worldwide designer and integrator of precision motion control products and systems for various industries, with a strong focus on culture and integrity |
779 | |||
| 29 |
AerCapaercap.com
Global aviation leasing leader with a strong order book, serving 300+ customers worldwide with fleet solutions Listed on NYSE, headquartered in Dublin |
739 | |||
| 30 |
Cairncairnhomes.com
Focused on creating sustainable communities that support individuals in thriving Embracing the #BuiltForGood ethos to drive positive change |
581 | |||
| 31 |
Gambling.com Groupgrandstand.com
A multi-award-winning digital marketing company focused on the online gambling industry, operating websites in multiple languages across 15 markets Publicly traded on Nasdaq |
510 | |||
| 32 |
Hostelworld Grouphostelworld.com
A social network-powered OTA in the hostelling sector, connecting travelers through social features and aiming to help them find people to hang out with |
474 | |||
| 33 |
Glenveagh Properties plcglenveagh.ie
Leading Irish homebuilder focused on delivering sustainable, high-quality homes in diverse communities through innovation, integration, and a commitment to customer satisfaction |
420 | |||
| 34 |
Grafton Group plcgraftonplc.com
An international distributor of building materials with leading positions in UK, Ireland, and the Netherlands, also manufacturing dry mortar and operating DIY retail stores |
384 | |||
| 35 |
Trinity Biotechtrinitybiotech.com
Specializing in diagnostic test kits and equipment, we prioritize quality and efficacy to provide reliable diagnosis, aiming for an inclusive workplace with varied roles |
381 | |||
| 36 |
Global Paymentsglobalpaymentsinc.com
Global Payments provides scalable, technology-driven payment solutions tailored to businesses of all sizes, enabling growth, expansion, and seamless transactions worldwide |
361 | |||
| 37 |
Diaceutics PLCdiaceutics.com
Provider of a diagnostic commercialization platform for precision medicine, facilitating access to tailored treatments through a global network of laboratories |
210 | |||
| 38 |
Connolly Motor Groupconnollys.ie
A family-run automotive group with 14 dealerships in west Ireland, offering new and used vehicles from top brands, car buying services, and exceptional customer care |
141 | |||
| 39 |
ResMed Sensor Technologiesresmed.com
Global leader in developing, manufacturing, and marketing medical products for respiratory disorders, specifically focusing on sleep-disordered breathing, to improve lives and raise awareness |
121 | |||
| 40 |
Ciratacirata.com
Specializes in migrating Hadoop data lakes to cloud platforms, enabling AI and analytics with flexibility, efficiency, and risk reduction. |
71 | |||
| 41 |
grenke Irelandgrenke.ie
The company provides fast, simple, and personalized financial solutions to businesses, offering leasing, invoice finance, and tailored options for various industries and start-ups |
57 | |||
| 42 |
Cybertekcybertek.ie
An ICT and Business Services provider offering friendly, efficient solutions including technology training, internet security, e-commerce solutions, and corporate image management |
23 | |||
| 43 |
Accenture PLCaccenture.com
A global management consulting and professional services firm offering strategy, digital, technology, and operations services to clients worldwide |
17 | |||
| 44 |
bxp softwarebxpsoftware.com
It provides tailored web-based software solutions including CRM, Contact Centre Management, eLearning, and Quality Assurance for various industries. |
8 | |||
| 45 |
Malin Corporation plcmalinplc.com
An investment company focused on supporting innovative life sciences companies to bring transformative outcomes for patients and value for shareholders |
6 | |||
| 46 |
TONA Commercial Interiors Ltd.tona.ie
A leading office fit out and design company in Ireland, specializing in project management to create functional workspaces tailored to clients' needs |
5 | |||
| 47 |
Business Talkbusinesstalk.ie
Specialized PR agency in Ireland focused on Financial Services sector Services include media relations, messaging, and editorial support to enhance clients' media presence |
5 | |||
| 48 |
IM TECH Industrial Manufacturing Technologies Ltdimtech.ie
Specializing in subcontract manufacturing of prototypes, special tooling, jigs, fixtures, and CNC batch production of precision components with quality assurance and high-tech machinery |
3 | |||
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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 Ireland
- The largest companies in Ireland 1,769
- Multinational companies in Ireland 564
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- Software Development companies in Ireland 176
- Retail chains in Ireland 166
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- Professional services firms in Ireland 126
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