Top companies in Ireland

EMEA HQ for many US tech giants and a growing native ecosystem.

Ranked by current headcount across companies headquartered in Ireland. Refreshed daily.

1
Accenture· Dublin 2, County Dublin, Ireland
- Grant
- 668.6k employees
- Founded 1989
2
Johnson Controls· Cork, County Cork, Ireland
- Post-IPO debt
- 59.7k employees
3
Eaton· Dublin 4, County Dublin, Ireland
- Post-IPO debt
- 49.9k employees
- Founded 1911
4
Smurfit Westrock· Dublin, County Dublin, Ireland
- Post-IPO debt
- 49.1k employees
- Founded 1934
5
Primark· Dublin 12, County Dublin, Ireland
- 46.8k employees
- Founded 1969
6
TE Connectivity· Galway, County Galway, Ireland
- Post-IPO debt
- 40.9k employees
- Founded 1941
7
ICON plc· Greater Dublin
- Post-IPO debt
- 34.6k employees
- Founded 1990
8
Health Service Executive· Dublin 4, County Dublin, Ireland
- 34.2k employees
- Founded 2005
9
Weatherford· Dublin, County Dublin, Ireland
- Post-IPO debt
- 29.3k employees
- Founded 1987
10
Ryanair - Europe's Favourite Airline· Dublin, County Dublin, Ireland
- Post-IPO debt
- 20.9k employees
- Founded 1985
11
Kerry· Naas, County Kildare, Ireland
- 16.6k employees
- Founded 1972
12
Smurfit Kappa· Dublin 4, County Dublin, Ireland
- 12.5k employees
- Founded 1934
13
Cimpress· Dundalk, County Louth, Ireland
- 12.4k employees
- Founded 1995
14
Tyco· Cork, County Cork, Ireland
- 12k employees
- Founded 1960
15
Keywords Studios· Dublin, County Dublin, Ireland
- Post-IPO equity
- 11.6k employees
- Founded 1998
16
Bank of Ireland· Dublin 4, County Dublin, Ireland
- Post-IPO debt
- 11.2k employees
17
AIB· Dublin, County Dublin, Ireland
- post ipo secondary
- 11k employees
- Founded 1966
18
Department of Education and Youth· Dublin 1, County Dublin, Ireland
- 10.8k employees
19
Allergan
- 10.1k employees
- Founded 1948
20
University College Dublin· Dublin 12, County Dublin, Ireland
- Grant
- 8.5k employees
21
Trinity College Dublin· Dublin 12, County Dublin, Ireland
- Grant
- 7.3k employees
22
University College Cork· Cork, County Cork, Ireland
- Grant
- 7.2k employees
23
CRH· Dublin, County Dublin, Ireland
- 7.2k employees
24
Dunnes Stores· Dublin, County Dublin, Ireland
- 7.1k employees
- Founded 1944
25
Allegion· Dublin 7, County Dublin, Ireland
- Post-IPO debt
- 6.8k employees
- Founded 2013

Find engineers and operators at companies in Ireland

Ireland is one of the densest markets for technology talent in the world. The list above ranks the largest companies headquartered in Ireland by current headcount, drawn from public LinkedIn and Crunchbase records. With 6,106 matching companies in our index, the depth of engineers, designers, product managers, and founders is broad across stages and industries.

Hiring in Ireland usually means hiring out of these companies. The biggest names anchor the talent pool — every senior engineer in Ireland likely has at least one of them on their resume — and the fast-growing ones generate the most movement.

Refolk lets you reach into this pool with plain English. Ask for “senior backend engineers in Irelandwho’ve shipped at scale” or “founders in Irelandwho left in the last year” and Refolk returns a ranked shortlist with the evidence behind each match.

How this list is built

Refolk pulled the largest companies headquartered in Ireland from public LinkedIn and Crunchbase records, ranked them by current employee count, and kept those with at least 25 employees. The list refreshes once a day.

Last refreshed: Thu, 07 May 2026 06:56:35 GMT

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