1. 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. The company is based in Cork and currently employs about 6,000 people . CEO of Apple ...

2. 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.

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. 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...

5. 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.

6. Medtronic plc

The medical device company Medtronic-Covidien became the largest Ireland-based company when it began trading on the New York Stock Exchange in 2015. Following Medtronic Inc’s $49.9 billion acquisition of Dublin-domiciled surgical supplies group Covidien, the Minneapol...

7. Johnson Controls

Headquartered in Cork, Johnson Controls is a global diversified technology and multi industrial leader serving a wide range of customers in more than 150 countries.

8. DCC

DCC is an international sales, marketing and support services group, supplying essential products and services used by millions of people every day across energy, healthcare and technology. It employs some 13,700 people across 20 countries and operates across four div...

9. Eaton Corp

Eaton is a power management company that provides energy-efficient solutions that help its customers effectively manage electrical, hydraulic and mechanical power more efficiently, safely and sustainably. Eaton has approximately 97,000 employees worldwide and sells prod...

10. Allergan Inc

In May 2020, Allergan was acquired by pharma giant Abbvie in a deal worth €58 billion. Allergan had previously been acquired by Actavis in 2015, but that business continued to be known as Allergan and was headquartered in Dublin. Allergan Pharmaceuticals Ireland, ...

11. Abbvie

Abbvie is a pharmaceutical company that discovers, develops, and markets both biopharmaceuticals and small molecule drugs. It originated in 2013 as a spin-off of Abbott Laboratories. AbbVie Ireland operates two separate plants in Sligo employing more than 200 staff. ...

12. MSD

MSD Ireland is one of the country’s leading healthcare companies, having first established here over 50 years ago. MSD, known as Merck & Co. Inc., Kenilworth, NJ, USA in the US and Canada, has operations in more than 140 countries and employs over 2,700 people in Irela...

13. 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...

14. Trane Technologies

Formerly Ingersoll-Rand, Trane Technologies was formed in early 2020 when part of the business separated and combined with Gardner Denver (which now trades as Ingersoll Rand Inc). Trane is listed on the NYSE. The industrial techology firm makes climate control system...

15. 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...

16. Pfizer

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...

17. 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...

18. 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...

19. 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...

20. 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...