1. Eaton Corp

Eaton is a power management company with 2015 sales of $20.9 billion. Eaton 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...

2. 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...

3. 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...

4. Ingersoll-Rand

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

5. Greencore

Greencore Group is an international manufacturer of convenience foods. The convenience foods division provides a wide range of chilled, frozen and ambient foods to major retail, manufacturing and foodservice customers in the UK and Ireland, as well as many in Contin...

6. Glen Dimplex

Glen Dimplex is the world's largest manufacturer of electrical heating, and also holds significant global market positions in domestic appliances, cooling, ventilation, and renewable energy solutions. Glen Dimplex Ireland is responsible for the design, manufacture and i...

7. 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 over 5,000 people as a result of a...

8. Bard Shannon

Dublin-based Bard Shannon is a subsidiary of US-owned healthcare provider CR Bard. Bard Shannon acts as a holding company for its subsidiaries which are engaged in the manufacturing and distribution of healthcare products. It has been located in Ireland since 1981.

9. Bombardier Aerospace

Bombardier Aerospace in Belfast specialises in major aircraft structures including fuselages, wings, engine nacelles and flight control surfaces in metal and advanced composites. The Canadian aerospace group employ about 5,000 people in Northern Ireland, and also produ...

10. Rehab

The Rehab Group, which in Ireland incorporates National Learning Network, RehabCare and Rehab Enterprises, is a not-for-profit organisation the mission of which is to "work towards a world where every person has the opportunity to achieve their potential". The peopl...

11. IPL Plastics

IPL Plastics plc is a sustainable packaging solutions provider primarily in the food and consumer, agricultural, logistics and environmental end-markets operating from multiple production facilities in Canada, the U.S., the U.K., Ireland, China and Mexico. IPL Plastics ...

12. Sandleford

Sandleford Limited supplies bicycle components to the bicycle industry, both in the bicycle manufacturing market and the after sales market.

13. 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 2,100 employees in Ir...

14. PCH International

PCH International (Amekab Ltd) provides customised supply chain management solutions for consumer products with a focus on consumer electronic brands. It was founded in 1996 and has its headquarters in Cork. Operational headquarters are in Shenzhen, China. It cov...

15. Bord na Mona

Bord Na Móna is an integrated utility service provider encompassing electricity, heating, resource recovery, water, growing media and related services. It is headquartered in Newbridge, Co Kildare and employs over 2,000 people.

16. GSK

Headquartered in the UK, GSK is a global organisation with offices in over 100 countries and major research centres in the UK, USA, Spain, Belgium and China. The company produces medicines that treat major disease areas such as asthma, anti-virals, infections, mental...

17. Doosan

DHEL is the Irish-based subsidiary of the Doosan Infrastructure group which is headquarted in Seoul, Korea. The group produces construction equipment which it ships to customers around the world. It has production facilities in Swords, Co Dublin.

18. Caterpillar Northern Ireland

Founded in 1966, Caterpillar (NI) Limited is Europe's largest diesel generating set manufacturer. The company houses eight Caterpillar divisions across four sites in Northern Ireland and has global manufacturing facilities in Brazil, China, India and the USA. The compa...

19. Sisk Group

SISK Group is a fith generation family business primarily known for the construction division John Sisk and Son which operates in Ireland, the UK, Poland and the Middle East. It has grown from a small local builder founded in Cork more than 150 years ago to an intern...

20. Northstone

Northstone (NI) Limited is a leading construction materials producer, utility chamber manufacturer and building and civil engineering contractor in Northern Ireland. The company has locations across Northern Ireland as well as in Co. Roscommon and in the UK. Northston...