1. Medtronic plc

Medical device group Medtronic became one of Ireland’s largest companies when it began trading on the New York Stock Exchange in January 2015. Following Medtronic Inc’s $49.9 billion acquisition of Dublin-domiciled surgical supplies group Covidien, the Minneapolis-ba...

2. 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 ...

3. CRH

CRH plc is an international building materials group. It employs approximately 76,000 people at 3,600 operating locations in 36 countries. The group was formed through a merger in 1970 of two leading Irish public companies, Cement Limited (established in 1936) and Ro...

4. 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.

5. 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.

6. Ingersoll-Rand

Ingersoll-Rand Irish Holdings operates as a subsidiary of Ingersoll-Rand Plc. The industrial techology firm makes climate control systems.

7. Actavis

In 2013 Actavis acquired Warner Chilcott, creating an $11 billion specialty pharmaceutical company with over $3 billion in pro forma sales. The combination capitalises on the complementary specialty pharmaceuticals strengths and market positions of the two organisations...

8. Dell Ireland

Since 1984, Dell has been an end-to-end computing solutions company. With more than 100,000 team members across the globe, Dell serves customers ranging from the world's largest businesses and public-sector organisations, to small and medium businesses, and individual c...

9. Paddy Power Betfair

Betting and gaming group Paddy Power is a global plc headquartered in Ireland. In 2015 it merged with UK group Betfair to form a €10 billion gambling business with operations in Ireland, Europe, Australia and the US.

10. 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...

11. 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...

12. Pfizer Global Supply

Pfizer is a research-based pharmaceutical multinational. The company was one of the first pharmaceutical companies to locate in Ireland (1969). The Irish operations manufacture some of Pfizer’s best-selling and newest medicines including Viagra (urology), Sutent (oncolo...

13. Apple Ireland

Apple designs and creates iPods and iTunes, Mac laptops and desktop computers, the OS X operating system, and the iPhone. The company first established operations in Ireland in 1980. It currently employs approximately 5,000 people in Cork.

14. Kerry Group

Kerry Group today provides food, food ingredients and flavours to the Irish and UK markets. Since the commissioning of its first dairy and ingredients plant in Listowel, Co Kerry in 1972, the company has grown to achieve current annualised sales of approximately €5.8 bi...

15. Ryanair

Ryanair is one of the largest airlines in Europe. Founded by the Ryan family in the mid-1980s, it operates more than 1,600 daily flights from 72 bases, connecting 194 destinations in 30 countries and operating a fleet of more than 300 new Boeing 737-800 aircraft.

16. 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...

17. Facebook

Founded in 2004, Facebook is a social utility that connects people with friends and others who work, study and live around them. People use Facebook to stay connected with friends and family, to discover what’s going on in the world, and to share and express what matter...

18. 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 ...

19. Peninsula Petroleum

Peninsula Petroleum Ltd is a physical bunker and lubricant supplier at the ports of Gibraltar, Ceuta, Canary Islands and Panama and is active as a worldwide trader with annual sales in excess of 6,000,000 metric tonnes. As part of the Gibunco Group, it also provides ...

20. Sandisk

Sandisk provides various flash memory storage, the data storage technology included in memory sticks, smartphones, tablets and mp3 players. The company claims that approximately 250,000 retail outlets offer SanDisk products to consumers globally and ships more than two ...