Ireland's "largest companies" list looks different from most countries' because of its 12.5% corporate tax rate and business-friendly legal framework, which has made Dublin (and a few other Irish cities) the legal domicile of choice for dozens of large multinationals — most of which do the bulk of their actual manufacturing, R&D, or trading elsewhere. As a result, this ranking is dominated by US-founded companies that have "re-domiciled" to Ireland (a process often called a tax inversion), alongside a smaller number of genuinely Irish-founded businesses like Ryanair, CRH, Kerry Group, and the two main domestic banks. Figures below are the latest reported revenue (fiscal year 2025 or trailing twelve months as of mid-2026), in US dollars.
Top 25 companies in Ireland by Sales in 2025
1. Accenture
Accenture, headquartered in Dublin, is one of the world's largest IT consulting and professional services firms, helping clients with technology strategy, systems integration, and increasingly, AI implementation. Revenue for the latest fiscal year was approximately $72.1 billion, generated by a global workforce of more than 770,000 people — only a small fraction of whom are actually based in Ireland, since Accenture's Dublin address is primarily a legal and tax domicile rather than an operational center.
Revenue for FY2025 – approximately $72.1 billion.
2. PDD Holdings
PDD Holdings, the parent company of Chinese e-commerce platform Pinduoduo and the international discount marketplace Temu, shifted its legal domicile from Shanghai to Dublin in 2023. Revenue is approximately $61.8 billion, though — much like Accenture — virtually all of PDD's actual operations, staff, and customers are in China and the international markets Temu serves, not in Ireland itself. The company has continued to expand Temu aggressively across Europe, the Americas, and Southeast Asia.
Revenue for FY2025 – approximately $61.8 billion.
3. CRH
CRH, headquartered in Dublin, is a genuinely Irish-founded building materials group (formed in 1970 through the merger of Cement Roadstone and Roadstone) that has grown into one of the world's largest suppliers of cement, aggregates, and construction materials, with the bulk of its business now in North America. Revenue is approximately $38.1 billion, with a global workforce of more than 75,000 spread across roughly 3,600 operating locations.
Revenue for FY2025 – approximately $38.1 billion.
4. Medtronic
Medtronic, which moved its legal and executive headquarters to Ireland in 2015 following its acquisition of Dublin-based Covidien, is the world's largest medical device company, making products for cardiac care, neuroscience, diabetes, and surgical procedures. Revenue for the trailing twelve months is approximately $35.5 billion, with more than 90,000 employees worldwide; most of Medtronic's day-to-day operations remain centered in Minneapolis, Minnesota.
Revenue for FY2025 – approximately $35.5 billion.
5. Smurfit Westrock
Smurfit Westrock, headquartered in Dublin, is a global packaging giant formed by the 2024 merger of Ireland's Smurfit Kappa (whose roots trace back to 1934) with the US paper and packaging group WestRock. Revenue is approximately $31.2 billion, making it one of the largest paper-based packaging companies in the world, with substantial manufacturing operations across Europe and the Americas.
Revenue for FY2025 – approximately $31.2 billion.
6. Eaton
Eaton, headquartered in Dublin, is a diversified power management company producing electrical, hydraulic, and aerospace components, benefiting in recent years from strong demand tied to data-center power infrastructure and electrification. Revenue is approximately $28.5 billion, with a global workforce of around 92,000-98,000 employees, though its main operational base remains in the United States.
Revenue for FY2025 – approximately $28.5 billion.
7. DCC
DCC plc, headquartered in Dublin, is a genuinely Irish-founded diversified sales, marketing, and distribution group with major operations in energy (fuel distribution), healthcare, and technology products. Revenue for the latest fiscal year (ending March) is approximately $26.2 billion, reflecting continued growth in its energy distribution arm despite volatile wholesale fuel prices.
Revenue for FY2025 – approximately $26.2 billion.
8. Johnson Controls
Johnson Controls, with its Irish registered office in Cork, is a global building technology and industrial group producing HVAC systems, fire and security equipment, and building automation products, following its 2016 merger with Tyco International. Revenue is approximately $24.4 billion, with the vast majority of its operations, R&D, and leadership based in the United States.
Revenue for FY2025 – approximately $24.4 billion.
9. Trane Technologies
Trane Technologies, headquartered in Swords, County Dublin, is a global climate control company making heating, ventilation, and air conditioning systems and refrigerated transport equipment under the Trane and Thermo King brands. Revenue is approximately $21.6 billion, with demand supported by data-center cooling needs and the broader push toward energy-efficient building systems.
Revenue for FY2025 – approximately $21.6 billion.
10. Aptiv
Aptiv, headquartered in Dublin, is a global automotive technology company producing electrical architecture, sensors, and software for vehicle safety and connectivity, spun out of the former Delphi Automotive. Revenue is approximately $19-20 billion, though the figure has shifted following the 2023 spin-off of its traditional powertrain business (now Phinia) to sharpen its focus on advanced safety and software-defined vehicle technology.
Revenue for FY2025 – approximately $19-20 billion.
11. TE Connectivity
TE Connectivity, headquartered in Galway, is a global manufacturer of connectors and sensors used across the automotive, industrial, data-center, and telecommunications sectors. Revenue for fiscal year 2025 reached a record $17.3 billion, up sharply from the prior year, driven largely by strong demand tied to AI data-center infrastructure and continued growth in its industrial segment.
Revenue for FY2025 – approximately $17.3 billion.
12. Aon
Aon, whose parent company redomiciled from the UK to Ireland in 2020 (while keeping its main operational office in London), is a leading global professional services firm specializing in insurance brokerage, reinsurance, and human capital consulting. Revenue is approximately $17.5 billion, with roughly 50,000 employees across more than 120 countries, following its 2021 acquisition attempt of Willis Towers Watson (itself also Irish-domiciled) that was ultimately terminated on antitrust grounds.
Revenue for FY2025 – approximately $17.5 billion.
13. Flutter Entertainment
Flutter Entertainment, headquartered in Dublin, is the world's largest online sports betting and iGaming operator, owning brands including FanDuel, Paddy Power, Betfair, and PokerStars. Revenue for fiscal year 2025 reached $16.4 billion, up more than 16% year-over-year, with the US market (led by FanDuel) now the company's single largest and fastest-growing region.
Revenue for FY2025 – approximately $16.4 billion.
14. Ryanair
Ryanair, headquartered in Swords, County Dublin, is Europe's largest low-cost airline by passenger numbers, operating a large fleet of Boeing 737s across an extensive short-haul network. Revenue is approximately $16.0 billion, with the airline continuing to expand capacity while managing ongoing aircraft delivery delays from Boeing.
Revenue for FY2025 – approximately $16.0 billion.
15. Seagate Technology
Seagate Technology, headquartered in Dublin, is a major manufacturer of hard disk drives and data storage solutions, serving cloud providers, enterprises, and consumer electronics makers. Revenue has climbed to roughly $9-10 billion, benefiting from a sharp rebound in demand for high-capacity storage tied to AI and cloud data-center buildouts.
Revenue for FY2025 – approximately $9-10 billion.
16. AerCap Holdings
AerCap, headquartered in Dublin, is the world's largest aircraft leasing company, owning and managing a fleet of more than 1,800 aircraft, along with helicopters and engines, leased to airlines worldwide. Revenue is approximately $8.3 billion, supported by continued strong demand for leased aircraft as airlines work through their own delivery backlogs with manufacturers.
Revenue for FY2025 – approximately $8.3 billion.
17. ICON plc
ICON, headquartered in Dublin, is one of the world's largest clinical research organizations (CROs), running clinical trials on behalf of pharmaceutical and biotech companies developing new drugs and therapies. Revenue is approximately $8.2 billion, with a workforce of more than 40,000 across dozens of countries, following its major 2021 acquisition of PRA Health Sciences.
Revenue for FY2025 – approximately $8.2 billion.
18. Kingspan Group
Kingspan, headquartered in Kingscourt, County Cavan, is a genuinely Irish-founded building materials company specializing in high-performance insulation, roofing, and building envelope products used to improve energy efficiency in construction. Revenue is approximately $8.8 billion, with continued growth driven by tightening building energy codes across Europe and North America.
Revenue for FY2025 – approximately $8.8 billion.
19. Kerry Group
Kerry Group, headquartered in Tralee, County Kerry, is a genuinely Irish-founded food and beverage ingredients company, supplying flavors, functional ingredients, and nutritional solutions to food manufacturers worldwide. Revenue is approximately $8.5 billion, with Kerry Co-operative Creameries remaining one of the company's largest shareholders, reflecting its farming heritage.
Revenue for FY2025 – approximately $8.5 billion.
20. Experian
Experian, headquartered in Dublin, is a global credit reporting and data analytics company providing credit scores, fraud detection, and consumer data services to lenders and businesses across more than 30 countries. Revenue is approximately $7.7 billion, with the United States remaining its single largest market by far.
Revenue for FY2025 – approximately $7.7 billion.
21. STERIS
STERIS, headquartered in Dublin, provides sterilization and infection prevention products and services to hospitals, medical device makers, and pharmaceutical companies worldwide. Revenue is approximately $5.6 billion, with demand supported by ongoing hospital infection-control spending and outsourced sterilization services for medical device manufacturers.
Revenue for FY2025 – approximately $5.6 billion.
22. AIB Group
AIB Group, headquartered in Dublin, is one of Ireland's two dominant domestic retail and commercial banks, having returned to full private ownership in 2025 following the Irish government's full exit from the stake it took during the 2008-2011 banking crisis bailout. Total income is approximately $4.9 billion, with the bank continuing to benefit from a relatively high interest rate environment supporting net interest margins.
Revenue for FY2025 – approximately $4.9 billion.
23. Bank of Ireland Group
Bank of Ireland, headquartered in Dublin, is Ireland's other major domestic bank, offering retail banking, business banking, and wealth management services primarily in Ireland and the UK. Total income is approximately $4.3 billion, with the bank continuing a multi-year push into digital banking and cost efficiency following its own crisis-era restructuring.
Revenue for FY2025 – approximately $4.3 billion.
24. Allegion
Allegion, headquartered in Dublin, is a global security products company making locks, access control systems, and door hardware under brands including Schlage and Von Duprin, spun off from Ingersoll Rand in 2013. Revenue is approximately $3.9 billion, with continued growth in electronic and connected access-control products.
Revenue for FY2025 – approximately $3.9 billion.
25. James Hardie Industries
James Hardie, headquartered in Dublin, is a global leader in fiber cement siding and building materials, best known in North America for its Hardie Board exterior cladding products. Revenue is approximately $3.9 billion, with the US new-construction and renovation markets remaining its primary growth driver.
Revenue for FY2025 – approximately $3.9 billion.
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