Top companies in Ireland

EMEA HQ for many US tech giants and a growing native ecosystem.

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Ranked by current headcount across companies headquartered in Ireland. Refreshed daily.

1
Accenture· Dublin 2, County Dublin, Ireland
Accenture helps the world’s leading enterprises reinvent by building their digital core and unleashing the power of AI to create value at speed for organizations across industries. Our strategy is to be the reinvention partner of choice for our clients and lead in the safe, widespread adoption of AI, and to be the most client-focused, AI-enabled, great place to work in the world. We bring together the talent of our approximately 786,000 people with proprietary assets and platforms, deep process and industry expertise, and leading ecosystem relationships to deliver end-to-end solutions and measurable outcomes at scale. Through our Reinvention Services, we offer broad expertise across Cybersecurity, Digital Core, Finance, Industry and Enterprise, Song, Supply Chain and Engineering, and Talent, with advanced capabilities in AI and Data, Industry and Process, and Technology. We serve approximately 9,000 clients and generated approximately $70 billion in FY25 revenue. Visit us at accenture.com.This LinkedIn company page is moderated. When engaging with Accenture, we encourage everyone to:- Use common courtesy and be respectful of others.- Create your own original content and avoid content that you know to be fraudulent.- Never repost someone else's copyrighted work, unless you have permission.- Never post personal, identifying, or confidential information.We reserve the right to delete comments or posts we deem to be:- Profane, obscene, inappropriate, offensive, abusive material.- Spam, repeated comments and commercial messages and personal advertisements.- Discriminatory or that contain hateful speech of any kind regarding age, gender, race, religion, nationality, sexual orientation, gender identity or disability.- Threats; personal attacks; abusive, defamatory, derogatory, or inflammatory language; or stalking or harassment of any individual, entity or organization.- False, inaccurate, libelous, or otherwise misleading in any way.
- Grant
- 696.6k employees
- Founded 1989
2
Johnson Controls· Cork, County Cork, Ireland
Johnson Controls is a global leader in thermal management, mission-critical building systems, energy efficiency and decarbonization. We help our customers use energy more productively, reduce carbon emissions and operate with the precision and resilience required in rapidly expanding industries such as data centers, healthcare, pharmaceuticals, advanced manufacturing and higher education.For more than 140 years, Johnson Controls has been delivering performance where it really matters. Backed by advanced technology, lifecycle services and an industry-leading field organization, we elevate customer performance, turning goals into real-world results and helping move society forward.Visit johnsoncontrols.com for more information.
- Post-IPO debt
- 60.3k employees
3
Eaton· Dublin 4, County Dublin, Ireland
Eaton is an intelligent power management company dedicated to improving the quality of life and protecting the environment for people everywhere. We are guided by our commitment to do business right, to operate sustainably and to help our customers manage power ─ today and well into the future. By capitalizing on the global growth trends of electrification and digitalization, we’re accelerating the planet’s transition to renewable energy and helping to solve the world’s most urgent power management challenges.Eaton is an Equal Opportunity Employer. Eaton is committed to ensuring equal employment opportunities for all job applicants and employees. Employment decisions are based upon job-related reasons regardless of an applicant's race, color, religion, sex, sexual orientation, gender identity, age, national origin, disability, marital status, genetic information, protected veteran status, or any other status protected by law.
- Post-IPO debt
- 51.8k employees
- Founded 1911
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4
Smurfit Westrock· Dublin, County Dublin, Ireland
Smurfit Westrock is a leading global paper and packaging solutions partner. With more than 97,000 employees operating across 500+ packaging and other facilities as well as 57 mills across 40 countries, we offer an unrivaled product portfolio and global expertise to deliver innovative solutions for a sustainable future.
- Post-IPO debt
- 50.4k employees
- Founded 1934
5
Primark· Dublin 12, County Dublin, Ireland
Primark was founded on a mission that everyone deserves to look and feel good – without paying more. We stand for great value without compromise, offering affordable fashion and everyday essentials that are made to last. Founded in Ireland in 1969, Primark is now an international fashion retailer with more than 470 stores across 18 countries in Europe, the US and the Middle East, employing more than 80,000 colleagues. Millions of shoppers trust Primark every week for everything from everyday essentials like t-shirts and socks, to the latest fashion trends – all at unbeatable prices.Primark is built on a belief and passion for physical stores – helping to bring high streets and retail centres to life and creating joyful, social experiences. The company is focused on driving positive change by giving clothing a longer life, protecting life on the planet and supporting the livelihoods of the people who make Primark clothes. More information can be found at https://corporate.primark.com/en-gb
- 46.7k employees
- Founded 1969

6
TE Connectivity· Galway, County Galway, Ireland
TE Connectivity plc (NYSE: TEL) is a global industrial technology leader creating a safer, sustainable, productive and connected future. As a trusted innovation partner, our broad range of connectivity and sensor solutions enable the distribution of power, signal and data to advance next-generation transportation, energy networks, automated factories, data centers enabling artificial intelligence and more. Our more than 90,000 employees, including 10,000 engineers, work alongside customers in approximately 130 countries. In a world that is racing ahead, TE ensures that EVERY CONNECTION COUNTS.
- Post-IPO debt
- 41.9k employees
- Founded 1941
7
ICON plc· Greater Dublin
Since our foundation in Dublin, Ireland in 1990, our mission has been to help our clients to accelerate the development of drugs and devices that save lives and improve quality of life. We do this by delivering best in class information, solutions and performance, with an unyielding focus on quality at all times.We offer a full range of consulting, development and commercialisation services from a global network of offices in 53 countries. We focus our innovation on the factors that are critical to our clients – reducing time to market, reducing cost, and increasing quality – and our global team of experts has extensive experience in a broad range of therapeutic areas.
- Post-IPO debt
- 35.2k employees
- Founded 1990
8
Health Service Executive· Dublin 4, County Dublin, Ireland
Our purpose is to provide safe, high quality health and personal social services to the population of Ireland. Our vision is a healthier Ireland with a high quality health service valued by all. Our Workforce The health service is the largest employer in the state with over 110,000 whole time equivalents (WTEs) (not including home helps) employed. Over 70,000 are employed directly by the HSE with the remaining 40,000 employedby voluntary hospitals and agencies. Our vision for healthcare is to put people at the heart of everything we do – we are committed to delivering high quality safe healthcare to our service users, communities and the wider population. Our staff are at the core of the delivery of healthcare services, working within and across all care settings in communities, hospitals and healthcare offices.
- 34.7k employees
- Founded 2005
9
Weatherford· Dublin, County Dublin, Ireland
Weatherford International plc (Nasdaq: WFRD) is a leading global energy services company. Operating in approximately 75 countries, the Company answers the challenges of the energy industry with its global talent network of approximately 17,000 team members and approximately 350 operating locations, including manufacturing, research and development, service, and training facilities.
- Grant
- 29.4k employees
- Founded 1987
10
Ryanair - Europe's Favourite Airline· Dublin, County Dublin, Ireland
Ryanair Holdings plc, Europe’s largest airline group, is the parent company of Ryanair DAC, Lauda, Buzz and Ryanair UK.Carrying 160m+ guests p.a. on over 3,000 daily flights to/from 225 airports. Plan to carry 225m+ guests p.a. by 2026. Unfortunately, we are unable to answer customer service queries through LinkedIn. Please contact our customer service department through our website:http://www.ryanair.com/ie/questions/contacting-customer-service/ alternatively you can contact us through Twitter @askRyanair or on facebook.com/Ryanair
- Post-IPO debt
- 21.4k employees
- Founded 1985

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Find engineers and operators at companies in Ireland

Ireland is one of the densest markets for technology talent in the world. The list above ranks the largest companies headquartered in Ireland by current headcount, drawn from public LinkedIn and Crunchbase records. With 6,286 matching companies in Refolk’s index, the depth of engineers, designers, product managers, and founders is broad across stages and industries.

Hiring in Ireland usually means hiring out of these companies. The biggest names anchor the talent pool - every senior engineer in Ireland likely has at least one of them on their resume - and the fast-growing ones generate the most movement.

Refolk lets you reach into this pool with plain English. Ask for “senior backend engineers in Ireland who’ve shipped at scale” or “founders in Ireland who left in the last year” and Refolk returns a ranked shortlist with the evidence behind each match.

How this list is built

Refolk pulled the largest companies headquartered in Ireland from public LinkedIn and Crunchbase records, ranked them by current employee count, and kept those with at least 25 employees. The list refreshes once a day.

Last refreshed: Wed, 05 Aug 2026 15:18:13 GMT

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How is this ranking built?

The list draws on the public company graph - headcount and growth signals, funding history, and recency. The criteria chips at the top show exactly which filters produced it, and the methodology section explains the ranking.

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