1. 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...

2. Penneys

Penneys, which is operated by Primark, is a discount clothing retailer with 38 stores in Ireland. It is a subsidiary of Associated British Foods.

3. 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 ...

4. Dunnes Stores Ireland

A combination of food, textiles and homewares all under one roof makes Dunnes Stores unique amongst Irish retail companies. In total there are 156 stores in the group, including five in Spain and Scotland and six in England.

5. 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...

6. Circle K Ireland Energy Group Limited

Circle K Ireland Energy Group was formed in 2008 by Ion Equity following the merger of the former Shell and Statoil forecourt networks. In December 2015 the group announced it was being sold to Canadian retail giant Alimentation Couche-Tard.

7. 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...

8. 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.

9. Applegreen

Motorway service station operator Petrogas is the company behind the Applegreen service stations. Applegreen is part of a consortium that holds a public-private partnership (PPP) contract with the National Roads Authority (NRA) to build and operate six motorway service ...

10. Bwg Group

BWG Group is an Irish retail and wholesale distribution company operating in the Republic of Ireland and the United Kingdom. The group includes several business divisions: BWG Foods – Retail, Wholesale and Wines & Spirits; BWG Property (Triode Newhill), Appleby Westward...

11. Lidl

Lidl is a discount supermarket chain founded in Germany. The company has 143 stores in the Republic of Ireland and 38 stores in Northern Ireland. Lidl currently employees over 4,400 people across the island of Ireland.

12. Aldi

Aldi is a German-owned discount supermarket chain and it opened its first supermarket in Ireland in 1999. The company does not disclose its sales or profits in Ireland. It has over 10,000 stores worldwide.

13. Amazon Data Services

Amazon has two main corporate entites in Ireland - Amazon Data Services Ireland Limited, which provides technological support for Amazon's websites, and Amazon CS Ireland Ltd (ACSIL) , based in Cork which provides customer service support. Together, they employed 1,700...

14. Boylesports

Boylesports is Ireland's largest independent bookmaker with 206 stores. Boylesports, which was established in 1982, offers online betting and odds on all of the top sporting events, with comprehensive coverage of horse racing, football, rugby, golf, tennis, cricket, gr...

15. Henderson Group

Family-owned Henderson Group are the owners of the Spar, Eurospar, Vivo and Vivoxtra franchises in Northern Ireland and have been distributing food and grocery-related products to the convenience retail sector for over 100 years. The Henderson Group consists of four in...

16. Volkswagen Group Ireland

The Volkswagen Group, which is headquartered in Wolfsburg, Germany is a car manufacturer. The group operates 94 production plants in 18 European countries and a further eight countries in the Americas, Asia and Africa. Volkswagen Group Ireland imports, markets and ...

17. Lissan Coal Company

LCC Ltd is a solid fuel importer & distributor, handling and delivering domestic and industrial coal at all levels of the supply chain. The company whose headquarters are based in Cookstown has become a nation wide retailer & distributor of domestic & industrial soli...

18. Smyths

Smyths Toys is a provider of children's entertainment products with 69 stores throughout the UK and Ireland: 41 in Britain, 22 in the Republic and six in Northern Ireland. The company sells everything from nursery products to preschool, toys for all ages as well as bike...

19. Maxol

McMullan Bros is the family-owned company behind the fuel wholesaler and retailer Maxol. Maxol has a network of 218 service stations and 22 authorised oil distributors. It employs an estimated 1,200 people.

20. Marks and Spencer

Marks & Spencer has 17 stores in the Republic of Ireland and employs 2,800 staff. There are 26 Irish suppliers on the Island of Ireland including Lir Chocolates, Keeling's, Glenpatrick, Wexford Creamery, Finnebrogue and the Carlow Brewing Company. M&S Ireland was winn...