Discover the top 10 biggest companies in Ireland by revenue in 2025, including Accenture, CRH (Cement Roadstone Holding), Medtronic, and more. Find out their industries, revenue, and stock symbols.
1. Accenture
Industry: technology
Revenue (FY2025): $69,700 Million (Accenture FY2025 results)
Stock symbol: ACN
Accenture is a multinational professional services company headquartered in Dublin, Ireland, founded in 1989. It operates in more than 120 countries worldwide, providing a wide range of services including consulting, technology, and outsourcing. Accenture’s main activities involve helping clients improve their performance and create sustainable value through innovative solutions. The company offers various products and services in areas such as strategy, digital, technology, and operations. In 2024-2025, Accenture has significantly expanded its AI and cloud services, supporting enterprises in digital transformation and sustainability initiatives. While Accenture does not have specific brands, it is known for its expertise in delivering high-quality and transformative solutions to its clients.
2. Cement Roadstone Holding
Industry: construction
Revenue (FY2025): $37,400 Million (CRH Q4 & FY2025 results)
Stock symbol: CRH
Cement Roadstone Holding is headquartered in Dublin, Ireland and was founded in 1949. It operates in multiple countries, with a presence in over 30 countries worldwide. The company’s main activities revolve around the production and distribution of cement and roadstone materials. They offer a wide range of products and services related to construction materials, including various brands such as CRH Cement and CRH Roadstone. In 2025, CRH has expanded its investment in sustainable construction technologies and infrastructure projects across Europe and North America.
3. Medtronic
Industry: healthcare
Revenue (FY2025): $33,500 Million (Medtronic FY2025 results)
Stock symbol: MDT
Medtronic, founded in 1949, is headquartered in Dublin, Ireland. It operates in more than 150 countries worldwide, making it a global leader in medical technology. Medtronic specializes in the development and manufacturing of medical devices and therapies, focusing on areas such as cardiac and vascular health, diabetes management, neurological disorders, and surgical technologies. Some of its well-known brands include the MiniMed insulin pump, the Micra pacemaker, and the StealthStation surgical navigation system. In 2025, Medtronic has accelerated its investment in digital health solutions and remote monitoring devices to meet growing global healthcare demands.
4. Johnson Controls
Industry: industrial
Revenue (FY2025): $23,600 Million (Johnson Controls FY2025 results)
Stock symbol: JCI
Johnson Controls is headquartered in Milwaukee, Wisconsin and was founded in 1885. It operates in multiple countries, with a presence in over 150 countries worldwide. The company is primarily engaged in providing technology solutions and services for buildings, including HVAC systems, energy management, and security solutions. Johnson Controls also manufactures automotive batteries and provides automotive seating and interior systems. Some of its well-known brands include YORK, Tyco, and Power Solutions. In 2025, Johnson Controls has expanded its portfolio in smart buildings and sustainability solutions, focusing on decarbonization and energy efficiency.
5. Eaton
Industry: industrial
Revenue (FY2025): $27,400 Million (Eaton FY2025 results)
Stock symbol: ETN
Eaton is a multinational company with its headquarters in Dublin, Ireland. It was founded in 1911. The company operates in more than 175 countries worldwide. Eaton specializes in power management solutions, electrical components, and systems for various industries. They offer a wide range of products and services, including electrical distribution, circuit protection, power quality, and energy management. Eaton is known for its brands such as Cutler-Hammer, Moeller, and Powerware. In 2025, Eaton continues to lead in energy transition technologies, with increased investments in grid modernization and e-mobility infrastructure.
6. Aptiv
Industry: automotive
Revenue (FY2025): $20,400 Million (Aptiv FY2025 results)
Stock symbol: APTV
Aptiv is headquartered in Dublin, Ireland and was founded in 1994. It operates in over 45 countries worldwide. The company specializes in designing and manufacturing advanced technology solutions for the automotive industry. Their main activities include developing software, electrical systems, and autonomous driving technologies. Aptiv offers a wide range of products and services such as vehicle connectivity, safety systems, and electrical architecture. They are known for their brands like Delphi Technologies and Signal & Power Solutions. In 2025, Aptiv is a key supplier for electric vehicle manufacturers and has expanded its partnerships in mobility software platforms.
7. Trane Technologies
Industry: industrial goods
Revenue (FY2025): $21,300 Million (Trane Technologies FY2025 results)
Stock symbol: TT
Trane Technologies, headquartered in Dublin, Ireland, was founded in 1885. It operates in over 100 countries worldwide. The company specializes in providing heating, ventilation, and air conditioning (HVAC) systems and services. Trane Technologies offers a wide range of products and solutions for residential, commercial, and industrial applications. Some of its well-known brands include Trane, Thermo King, and American Standard. In 2025, Trane Technologies has advanced its leadership in climate innovation, focusing on sustainable cooling and heating solutions.
8. Adient
Industry: automotive
Revenue (FY2025): $14,530 Million (Adient FY2025 results)
Stock symbol: ADNT
Adient is a multinational company with its headquarters in Plymouth, Michigan, United States. It was founded in 2016. The company operates in numerous countries worldwide, with a presence in over 30 countries. Adient specializes in automotive seating and interiors, providing innovative products and services to the automotive industry. They are known for their brands such as Adient, Recaro, and CNI. In 2025, Adient has expanded its footprint in electric vehicle seating solutions and lightweight materials for next-generation vehicles.
9. Seagate Technology
Industry: technology
Revenue (FY2025): $9,100 Million (Seagate FY2025 results)
Stock symbol: STX
Seagate Technology is headquartered in Cupertino, California and was founded in 1979. It operates in multiple countries, with a presence in over 40 countries worldwide. The company is primarily engaged in the design, manufacturing, and distribution of data storage solutions, including hard disk drives, solid-state drives, and storage systems. Seagate Technology is known for its reliable and high-performance storage products and services, catering to both consumer and enterprise markets. In 2025, Seagate has focused on developing high-capacity storage for AI and cloud infrastructure.
10. Ryanair
Industry: transportation
Revenue (FY2025/26, year ended March 2026): €15,540 Million (Ryanair FY2025/26 results)
Stock symbol: RYAAY
Ryanair is an Irish low-cost airline headquartered in Dublin, Ireland. It was founded in 1984. The company operates in multiple countries, with operations in over 40 countries worldwide. Ryanair’s main activities include providing scheduled passenger services on short-haul flights. They offer a range of products and services, including flight bookings, in-flight meals, and baggage services. Ryanair is known for its no-frills approach and has become one of Europe’s largest and most successful low-cost carriers. In 2025, Ryanair has increased its fleet size and expanded its network, focusing on sustainability initiatives and digital customer services.
The combined revenue of the nine US-dollar-reporting companies on this list totals approximately $256,930 Million for FY2025, with Ryanair reporting €15,540 Million for its year ended March 2026.
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Last updated: June 19, 2026
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