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

2. 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.

3. 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...

4. HP Ireland

Hewlett Packard in Ireland runs nine different businesses with over 4,000 employees in the areas of manufacturing, research and development, customer software support, marketing, and sales and services. The main site for HP in Ireland is located in Leixlip, Co Kildare, ...

5. Accenture

Accenture is a global professional services company, providing a broad range of services and solutions in strategy, consulting, digital, technology and operations. The company has been operating in Ireland since 1969 and is part of a global network spanning 120 countrie...

6. Eircom

Eir (previously known as eircom) is the principal provider of fixed-line telecommunications services in Ireland with approximately 2.6 million fixed-line telephone access channels in service. The company's mobile division includes Meteor and emobile. In March 2016, Eir...

7. IBM

IBM is a provider of advanced information technology, products, services and business consulting expertise. IBM in Ireland is made up of a diverse workforce of over 3,000 employees working across a broad range of businesses and locations including: IBM Ireland, which...

8. Skillsoft

Skillsoft provides cloud-based learning solutions for customers worldwide, who range from global enterprises, government and education customers to mid-sized and small businesses.

9. Mentor Graphics

Mentor Graphics (Holdings) Ltd is part of the US group Mentor Graphics Corporation (MGC). MGC specialises in the research, development and manufacture of software products and services, and the distribution of software products throughout the world. Its Irish base is...

10. Allstate NI

Allstate Northern Ireland provides high quality software development services and business solutions in support of parent company The Allstate Corporation, which is America’s largest publically help personal lines, property and casualty insurer. Allstate NI was establ...

11. Abtran

Abtran is one of the largest indigenous business process outsourcer (BPO) in the Irish market. It provides customer management solutions to the public and private sectors.

12. First Derivatives

First Derivatives is a leading provider of products and consulting services to the capital markets industry. Incorporated in 1996, First Derivatives is a publicly-held company, trading on the London Stock Exchange and Irish Stock Exchange. The company is head-quartere...

13. G4S Secure Solutions

G4S Secure Solutions is the security division of G4S, the UK listed company which has a presence in Ireland. G4S Secure Solutions operates in five broad areas of business - guarding services, security & Fire systems, monitoring & response, support services and cash ...

14. 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...

15. Pramerica

Pramerica Systems Ireland Limited is a software development and contact centre subsidiary of U.S.-based Prudential Financial Inc. (NYSE: Pru), a financial services group with approximately $1 trillion in assets under management as of December 31, 2014. The parent firm h...

16. Bentley Software

Bentley provides architects, engineers, geospatial professionals, constructors, and owner-operators with comprehensive software solutions for sustaining infrastructure.

17. 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 ...

18. Arvato Digital Services

Arvato Digital Services, formerly Sonopress, provides a comprehensive range of services and solutions to its business partners in the IT/high-tech, games, video, and audio sectors. It is a provider of integrated solutions that include every step of the value chain, ...

19. Ericsson

Ericsson is a Swedish telecommunications giant which provides technology and services to the mobile phone industry. Ericsson Ireland makes telecommunications equipment and related software and training products. It also provides professional services to other Ericsson...

20. Arvato

Arvato Finance Services Limited, trading as Arvato Financial Solutions, is an Irish division of global business outsourcing company, Arvato. In Ireland, it employs over 1,300 people across more than four locations, with over 68,000 employees worldwide working in over ...