1. 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.

2. 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...

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. 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...

5. 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...

6. Vodafone

Vodafone is communications operator with 2.4 million customers. It first entered the Irish market in May 2001, having acquired Eircell. Vodafone Ireland is part of Vodafone Group, one of the world's largest mobile communications companies by revenue.

7. 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.

8. Three Ireland

Three entered the Irish mobile phone and broadband market in 2005 and today is Ireland’s second largest mobile operator with two million customers (as of December 2015). It operates 2G, 3G and 4G networks and has to date invested nearly €2 billion in Ireland. It bou...

9. 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...

10. VCE

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

11. 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 ...

12. 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...

13. 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...

14. Independent News & Media (INM)

Independent News & Media (INM) is a newspaper and media group across the island of Ireland. INM has market-leading newspaper positions in Ireland and Northern Ireland, with a strong and growing digital presence. INM is the largest newspaper contract printer and whole...

15. Fónua

Fónua is invovled in the distribution and repair of mobile phones and mobile phone accessories. It has an annual turnover exceeding €300 million and its customers include blue chip multi-national telecommunication companies such as Vodafone, O2 and Meteor as well as...

16. Sky Ireland

Sky is Europe’s leading 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. Sky Ireland launched premium feature Sky Q this year...

17. 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...

18. 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...

19. 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...

20. 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...