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Ireland— IE

Company data in Ireland, by industry

Browse Ireland company directories across 56 industries — 396,994 businesses in the InfobelPRO database, registry-sourced from CRO and enriched with firmographics, location, financials and group structure.

396,994
Registered companies
APPLE OPERATIONS INTERNATIONAL LIMITED
Largest company
Other business support service activities n.e.c.
Largest sector
24th
in Europe by count

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Comparing vendors? Read Best B2B data providers in Ireland.

Rankings

Largest companies in Ireland

By revenue, one row per corporate group — reported (actual) revenue, updated September 2026.

#Company (group)IndustryHQRevenue (USD)
1APPLE OPERATIONS INTERNATIONAL LIMITEDManufacture of computers and peripheral equipmentCork$235.3B
2MICROSOFT IRELAND INVESTMENTS UNLIMITED COMPANYSoftware publishingDublin$93.1B
3GOOGLE EUROPE, MIDDLE EAST AND AFRICA UNLIMITED COMPANYOther information technology and computer service activitiesDublin 4$91.6B
4FACEBOOK INTERNATIONAL OPERATIONS LIMITEDOther information technology and computer service activitiesDublin 4$90.2B
5PSE KINSALE ENERGY LIMITEDSupport activities for petroleum and natural gas extractionCork$71B
6ACCENTURE PUBLIC LIMITED COMPANYOther information technology and computer service activitiesDublin$69.7B
7CRH PUBLIC LIMITED COMPANYManufacture of bricks, tiles and construction products, in baked clayRathfarnham$35.6B
8MEDTRONIC PUBLIC LIMITED COMPANYOther human health activitiesGalway$33.5B
9LINDE PUBLIC LIMITED COMPANYManufacture of industrial gasesDublin$33B
10NUTRICIA INFANT NUTRITION LIMITEDManufacture of other food products n.e.c.Dublin$29B
11PFIZER SERVICE COMPANY IRELAND UNLIMITED COMPANYSecurity and commodity contracts brokerageDublin$27.9B
12EATON CORPORATION PUBLIC LIMITED COMPANYSecurity and commodity contracts brokerageDublin$24.9B
13DCC PUBLIC LIMITED COMPANYFinancial leasingFoxrock$22.8B
14TRANE TECHNOLOGIES PUBLIC LIMITED COMPANYManufacture of instruments and appliances for measuring, testing and navigationSwords$19.8B
15Southern Health BoardGeneral medical practice activitiesCork$19.8B

Top 15 of 25 · DIAGEO PLC, WPP EMERALD LIMITED, RYANAIR HOLDINGS PUBLIC LIMITED COMPANY, TE CONNECTIVITY PUBLIC LIMITED COMPANY, FLUTTER ENTERTAINMENT PUBLIC LIMITED COMPANY, DIAGEO IRELAND HOLDINGS UNLIMITED COMPANY, AON PUBLIC LIMITED COMPANY, DELL PRODUCTS UNLIMITED COMPANY, WPP PLC, ADIENT PUBLIC LIMITED COMPANY follow. Methodology →

APPLE OPERATIONS INTERNATIONAL LIMITED leads by reported revenue at $235.3B, the largest of 25 ranked corporate groups.

Coverage

Companies by industry

The B2B industries we cover, ranked by number of companies. Each links to the full directory.

Construction companies
41,383
Retail companies
28,433
Consulting companies
20,554
Real estate companies
19,679
Distribution & wholesale
17,933

+ 51 more industries below ↓

Construction companies is the most populated sector we cover, with 41,383 companies — 10% of Ireland's 396,994 registered.

Distribution

Company size & revenue

By number of employees

1–4
284,331
5–9
48,437
10–19
27,615
20–49
17,431
50–99
5,398
100–199
2,786
200–499
1,599
500–999
565
1000+
600

The 1–4 band is shown with a broken bar — it is ~6× the next band; the smaller bands are scaled against each other so they stay readable. 12,435 companies have no disclosed headcount (excluded).

Around 73% of companies with disclosed headcount employ fewer than five people, so the market skews heavily toward micro-enterprises.

By revenue (local currency)

1–100K
264,961
100K-499K
87,852
500K-999K
9,972
1M-4.99M
12,112
5M-9.99M
2,678
10M-49.99M
6,553
50M-99.99M
1,248
100M-499.99M
1,172
500M-999.99M
217
1B+
337

14,095 companies have no disclosed revenue (excluded from the chart).

The most common disclosed-revenue band is 1–100K, covering 68% of companies with reported revenue.

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Geography

Where Irish companies are based

Distribution by region.

Dublin
154,943
Cork
43,226
Galway
18,720
Kildare
15,773
Limerick
14,047

Dublin holds the largest regional share, with 48% of companies that have a disclosed region.

Group linkage

Corporate structure in Ireland

How much of the market is part of a corporate group vs independent.

42%

Part of a corporate group

59%

Independent

42% of companies belong to a corporate group; the remaining 59% operate independently.

Corporate groups

Largest corporate groups in Ireland

Irish-headquartered groups ranked by total group entities worldwide — a measure of corporate reach.

#GroupGroup entities (worldwide)
1LINDE PUBLIC LIMITED COMPANY4,099
2CRH PUBLIC LIMITED COMPANY3,160
3JOHNSON CONTROLS INTERNATIONAL PUBLIC LIMITED COMPANY2,577
4AON PUBLIC LIMITED COMPANY1,813
5ACCENTURE PUBLIC LIMITED COMPANY1,732
6EATON CORPORATION PUBLIC LIMITED COMPANY1,193
7TRANE TECHNOLOGIES PUBLIC LIMITED COMPANY1,002
8DCC PUBLIC LIMITED COMPANY949
9WILLIS TOWERS WATSON PUBLIC LIMITED COMPANY781
10WEATHERFORD INTERNATIONAL PUBLIC LIMITED COMPANY728

Group entities = total members of the corporate family worldwide, for groups whose ultimate parent is in Ireland.

LINDE PUBLIC LIMITED COMPANY is the largest corporate group headquartered in Ireland, with 4,099 entities worldwide.

Foreign ownership

Foreign-owned vs domestic

Among Ireland's larger companies, the share ultimately controlled from abroad — and the leading countries of ownership.

63%

Foreign-owned

37%

Irish-owned

Leading countries of ownership

United States of America
33.9%
England
17%
Netherlands
6.9%
Luxemburg
6.9%
France
5.7%

Shares calculated on the largest companies by revenue with ownership data available, not an absolute national figure.

United States of America is the leading country of foreign ownership, at 33.9%.

FAQ

Ireland company data — frequently asked questions

There are 396,994 registered companies in Ireland across all sectors, from sole traders to large enterprises.
By reported revenue, APPLE OPERATIONS INTERNATIONAL LIMITED is the largest company in Ireland, followed by MICROSOFT IRELAND INVESTMENTS UNLIMITED COMPANY and GOOGLE EUROPE, MIDDLE EAST AND AFRICA UNLIMITED COMPANY.
Other business support service activities n.e.c., Activities of holding companies, Business and other management consultancy activities have the most registered companies.
You can request a free sample or access the full Ireland database, filtered by industry, size, region and revenue, via InfobelPRO.
Sourced from the Infobel DaaS database. The largest-companies ranking is consolidated at corporate-group level (one row per group) and shows reported (actual) revenue in USD; modeled figures are excluded. Distributions cover all registered companies. Industry directories use a NACE-based B2B taxonomy. Last updated September 2026.

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