1. Accenture

Accenture is a global professional services company, providing a broad range of services in strategy, consulting, digital, technology and operations. The company began operating in Ireland since 1969 and is part of a global network spanning 120 countries and more than 3...

2. CRH

CRH plc is an international building materials group. The group was formed through a merger in 1970 of two leading Irish public companies, Cement Limited (established in 1936) and Roadstone Limited (1949). It is headquartered in Dublin.

3. Microsoft

Microsoft Ireland Operations Ltd is a subsidiary of the software giant Microsoft which sells, distributes and markets software globally from Dublin. Microsoft, the world’s biggest software company, established an Irish manufacturing facility in 1985 and now employs ...

4. DCC

The DCC group provides sales, marketing, distribution and business support services and operates across five divisions: Energy, SerCom (which encompasses IT and entertainment products) Healthcare, Environmental and Food and Beverage.

5. Google

Google Ireland is the Europe, Middle East and Africa (EMEA) headquarters for Google and provides technical, sales and operations support to customers in over 50 countries.

6. Smurfit Kappa

Smurfit Kappa is one of the leading producers of paper-based packaging in the world. Its products include containerboard, solid board, corrugated and solid board packaging, graphic board and sack paper. The group's headquarters are in Clonskeagh in Dublin 4 and i...

7. Musgrave

Founded in Cork in the 1870s by Thomas and Stuart Musgrave, Musgrave is one of Ireland's oldest privately-owned companies. It is still controlled by members of the Musgrave family. The owner of the Supervalu, Centra and Daybreak franchise chains, it acquired Superquinn ...

8. Oracle

The principal activity of Oracle EMEA Ltd is the manufacture and sale of computer software in the European market, together with the provision of associated translation, finance and marketing services. Oracle Corporation, incorporated in 2005, is an enterprise softw...

9. Ryanair

Every year Ryanair carries over 113 million passengers connecting 200 destinations in 33 countries on a fleet of 350 Boeing 737 aircraft based at 84 different European airports. With a further 350 Boeing 737s on order, Ryanair plans to lower fares and grow traffic to ov...

10. Boston Scientific

Founded in 1979 Boston Scientific is now one of the world’s largest medical device companies. Focusing on less invasive medicine, it operates within four primary business divisions: Cardiology, Rhythm and Vascular; Endoscopy; Urology & Women's Health, and Neuropathi...

11. Kingston

Kingston Technology International Ltd is a manufacturer of memory products such as USB drives. It markets over 2000 memory products and supports more than 6000 systems. It is a privately owned company with headquarters based in Fountain Valley, California and with s...

12. Tesco

Tesco's reach in Ireland includes convenience stores, supermarkets and superstores across Ireland selling fresh food, groceries and household products, as well as clothing, books, hardware, electrical goods etc in larger stores. Services offered include Tesco Mobile, Te...

13. Topaz

Topaz energy was formed in 2008 by Ion Equity following the merger of the former Shell and Statoil forecourt networks. It operates about 330 petrol stations across the country and accounts for about a quarter of the market. In December 2015 the group announced it was...

14. Total Produce

Total Produce grows, sources, imports, packages, distributes and markets over 200 lines of fresh fruits, vegetables and flowers. A spin off of Fyffes, the company is made up of the former general produce and distribution division of the company, and was included in Dubl...

15. Glanbia

Glanbia plc is an international nutritional solutions and cheese group which has its headquarters in Ireland. It has four segments; Dairy Ireland, US Cheese & Global Nutritionals, Joint Ventures and Associates and Other Business. The group has manufacturing and processi...

16. Grafton

The Grafton Group plc is a builders merchanting, DIY retailing and mortar manufacturing markets in Britain and Ireland. In Ireland it trades under the brands Woodie’s DIY , Heiton Buckley, Chadwicks and MacNaughton Blair. These businesses turnover €2 billion from 600 lo...

17. CMC

CMC distributes and markets coal products which is mined at Cerrejón, Colombia. It has an office in Dublin where it employs 31 people. Europe is the largest single market for CMC and it also sells to central and south america, the US and Asia. It is owned in equal par...

18. Diageo

Diageo was created in 1997 through the merger of Grand Metropolitan and Guinness, creating a global food and drinks conglomerate. Diageo has a number of production facilities throughout Ireland, producing brands such as Guinness at St. James’s Gate Brewery, Baileys ...

19. Intel Ireland

Intel Ireland's Leixlip campus began operations in 1989. Since then, the multinational microchip manufacturer has invested over €6 billion in developing this base. It employs over 5,000 people at its Irish subsidiary.

20. UDG Healthcare

UDG Healthcare plc is a provider of outsourced commercialisation solutions to healthcare companies operating across four areas of expertise. The company announced plans to buy the healthcare communications business of KnowledgePoint360 for €105 million in February 20...