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. 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. Linkedin

Founded in 2003, LinkedIn is the business-oriented social networking site, which connects the world’s professionals and strengthens their network. LinkedIn has had an office in Dublin for five years. Linked in has more than 400 million members in over 200 countries and...

5. Maxim Integrated Products

Maxim Integrated Products makes integrated analog and mixed-signal semiconductors. The company supplied a broad range of linear and mixed signal integrated products, commonly referred to as analog circuits. In May 2010, the company opened its offices in Clonskeagh, D...

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. Vodafone

Vodafone Group is one of the world’s largest telecommunications companies and provides a range of services including voice, messaging, data and fixed communications. Vodafone Group has mobile operations in 21 countries and partners with mobile networks in 48 more. As of...

8. Sky Ireland

Sky is an entertainment company and serves 21 million customers across five countries. Sky Ireland is based in Dublin and provides customers with digital television channels and broadband facilities.

9. Three Ireland

Three is one of Ireland’s leading mobile operators with 36.8 per cent market share and 2.6 million customers (as of March 2021). Three’s network has 99 per cent 4G coverage and is built for data; carrying over 60 per cent of all mobile data on the network. Three lau...

10. Avaya International

Avaya provides business communications systems. The company provides unified communications, contact centres, data solutions and related services both directly and through its channel partners to businesses and organisations around the world.

11. Commscope

Commscope EMea Ltd is a subsidiary of the global cable provider Commscope. The company makes physical cables connecting telephones, work stations, local area networks (lan's) and other communication devices. in January 2011 Commscope was purchased by the Carlylse Grou...

12. Virgin Media

Virgin Media offers TV, broadband and phone services to business and residential customers in Ireland. Branded as UPC in Ireland until October 2015, Virgin Media is owned by Liberty Global, Inc. an international cable operator, which bought the broader Virgin Media ...

13. BT

BT is Ireland’s second largest fixed line communications and IT services company whose business in the State consists of two main parts, wholesaling services to other communications companies and retailing to major businesses and government. It wholesales services t...

14. RTE

RTE is the State owned Public Service Broadcaster. It is a non-profit making organisation which receives some of its income from Television Licence fees. RTE provides free-to-air television, radio and online services. RTE television operates two free-to-air televisio...

15. Orange Business Services

Equant Network Services International Limited is a trading company of Orange Business Services (OBS) in Ireland. It provides data processing and clearing services to the OBS group which is a global IT and communications services provider. It also provides telec...

16. M/A-COM Technology Solutions

M/A-COM Technology Solutions Holdings, Inc. is a supplier of high performance analog RF, microwave, millimeterwave and photonic semiconductor products that enable next-generation Internet and modern battlefield applications. M/A-COM Tech is headquartered in Lowell, Ma...

17. KN Circet

KN Circet is an infrastructure and utilities services provider operating in Ireland, UK and internationally. Its areas of expertise span civil engineering, telecoms, construction, wireless technologies, rail infrastructure and home energy services. Its Irish office is l...

18. VCE

VCE, formed by Cisco and EMC with investments from VMware and Intel, offers converged cloud infrastructure systems.

19. Fónua

Fónua is involved in the distribution and repair of mobile phones and mobile phone accessories. It has an annual turnover exceeding €240 million and its customers include blue chip multi-national telecommunication companies such as Vodafone, O2 and Meteor as well as...

20. Zynga

Zynga Inc is a provider of social game services with more than 240 million monthly active users playing its games, which include CityVille, Zynga Poker, Draw Something, Hidden Chronicles, FarmVille, CastleVille and Mafia Wars. Zynga's games are available on a number o...