Ireland

Top 86 largest Irish Companies by Market Cap

This is the list of the largest public listed companies from Ireland by market capitalization with links to their reference stock, sector and industry.

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Top Companies from Ireland as of Jul. 01, 2025

Rank Company Market Cap (USD) Country Sector Industry
1 Accenture plc $189.83 B Ireland Irish Technology Irish Information Technology Services
2 Eaton Corporation plc $140.16 B Ireland Irish Industrials Irish Specialty Industrial Machinery
3 Medtronic plc $113.25 B Ireland Irish Healthcare Irish Medical Devices
4 Trane Technologies plc $96.50 B Ireland Irish Industrials Irish Specialty Industrial Machinery
5 Aon Plc $76.61 B Ireland Irish Financials Irish Insurance Brokers
6 Johnson Controls International plc $69.14 B Ireland Irish Industrials Irish Engineering & Construction
7 CRH plc $64.19 B Ireland Irish Basic Materials Irish Building Materials
8 Experian plc $47.42 B Ireland Irish Industrials Irish Consulting Services
9 Seagate Technology plc $32.24 B Ireland Irish Technology Irish Computer Hardware
10 Flutter Entertainment plc $31.25 B

(Jan. 1, 2024)

 Ireland Irish Consumer Discretionary Irish Gambling
11 Horizon Therapeutics Public Limited Company $26.63 B

(Jan. 1, 2025)

 Ireland Irish Healthcare Irish Drug Manufacturers—General
12 STERIS plc $23.44 B Ireland Irish Healthcare Irish Medical Instruments & Supplies
13 AerCap Holdings N.V. $20.86 B Ireland Irish Industrials Irish Airports & Air Services
14 Ryanair Holdings plc $18.18 B

(Dec. 1, 2021)

 Ireland Irish Industrials Irish Airlines
15 Kerry Group plc $17.85 B Ireland Irish Consumer Staples Irish Packaged Foods
16 AIB Group plc $17.25 B Ireland Irish Financials Irish Banks—Regional
17 Aptiv PLC $15.72 B Ireland Irish Consumer Discretionary Irish Auto Parts
18 Kingspan Group plc $15.52 B Ireland Irish Industrials Irish Building Products & Equipment
19 Bank of Ireland Group plc $13.91 B Ireland Irish Financials Irish Banks—Regional
20 James Hardie Industries plc $13.46 B

(July 1, 2024)

 Ireland Irish Basic Materials Irish Building Materials
21 Allegion plc $12.74 B Ireland Irish Industrials Irish Security & Protection Services
22 ICON Public Limited Company $11.99 B Ireland Irish Healthcare Irish Diagnostics & Research
23 Smurfit Kappa Group plc $11.62 B

(July 1, 2024)

 Ireland Irish Consumer Discretionary Irish Packaging & Containers
24 Jazz Pharmaceuticals plc $6.62 B Ireland Irish Healthcare Irish Biotechnology
25 DCC plc $6.56 B Ireland Irish Energy Irish Oil & Gas Refining & Marketing
26 Alkermes plc $4.76 B Ireland Irish Healthcare Irish Biotechnology
27 Glanbia plc $3.82 B Ireland Irish Consumer Staples Irish Packaged Foods
28 UDG Healthcare plc $3.77 B

(Aug. 1, 2021)

 Ireland Irish Healthcare Irish Medical Care Facilities
29 Perrigo Company plc $3.74 B Ireland Irish Healthcare Irish Drug Manufacturers—Specialty & Generic
30 Grafton Group plc $2.66 B Ireland Irish Industrials Irish Building Products & Equipment

Top Companies from Ireland as of Jul. 01, 2025

1. Accenture

Company Profile: Accenture plc
Market Cap (USD): $189.83 B
Country: Ireland
Sector: Irish Technology
Industry: Irish Information Technology Services

2. Eaton Corporation plc

Company Profile: Eaton Corporation plc
Market Cap (USD): $140.16 B
Country: Ireland
Sector: Irish Industrials
Industry: Irish Specialty Industrial Machinery

3. Medtronic

Company Profile: Medtronic plc
Market Cap (USD): $113.25 B
Country: Ireland
Sector: Irish Healthcare
Industry: Irish Medical Devices

4. Trane Technologies plc

Company Profile: Trane Technologies plc
Market Cap (USD): $96.50 B
Country: Ireland
Sector: Irish Industrials
Industry: Irish Specialty Industrial Machinery

5. Aon Plc

Company Profile: Aon Plc
Market Cap (USD): $76.61 B
Country: Ireland
Sector: Irish Financials
Industry: Irish Insurance Brokers

6. Johnson Controls International plc

Company Profile: Johnson Controls International plc
Market Cap (USD): $69.14 B
Country: Ireland
Sector: Irish Industrials
Industry: Irish Engineering & Construction

7. CRH plc

Company Profile: CRH plc
Market Cap (USD): $64.19 B
Country: Ireland
Sector: Irish Basic Materials
Industry: Irish Building Materials

8. Experian plc

Company Profile: Experian plc
Market Cap (USD): $47.42 B
Country: Ireland
Sector: Irish Industrials
Industry: Irish Consulting Services

9. Seagate Technology plc

Company Profile: Seagate Technology plc
Market Cap (USD): $32.24 B
Country: Ireland
Sector: Irish Technology
Industry: Irish Computer Hardware

10. Flutter Entertainment plc

Company Profile: Flutter Entertainment plc
Market Cap (USD): $31.25 B (Jan. 1, 2024)
Country: Ireland
Sector: Irish Consumer Discretionary
Industry: Irish Gambling

11. Horizon Therapeutics Public Limited Company

Company Profile: Horizon Therapeutics Public Limited Company
Market Cap (USD): $26.63 B (Jan. 1, 2025)
Country: Ireland
Sector: Irish Healthcare
Industry: Irish Drug Manufacturers—General

12. STERIS plc

Company Profile: STERIS plc
Market Cap (USD): $23.44 B
Country: Ireland
Sector: Irish Healthcare
Industry: Irish Medical Instruments & Supplies

13. AerCap Holdings N.V.

Company Profile: AerCap Holdings N.V.
Market Cap (USD): $20.86 B
Country: Ireland
Sector: Irish Industrials
Industry: Irish Airports & Air Services

14. Ryanair Holdings plc

Company Profile: Ryanair Holdings plc
Market Cap (USD): $18.18 B (Dec. 1, 2021)
Country: Ireland
Sector: Irish Industrials
Industry: Irish Airlines

15. Kerry Group plc

Company Profile: Kerry Group plc
Market Cap (USD): $17.85 B
Country: Ireland
Sector: Irish Consumer Staples
Industry: Irish Packaged Foods

16. AIB Group plc

Company Profile: AIB Group plc
Market Cap (USD): $17.25 B
Country: Ireland
Sector: Irish Financials
Industry: Irish Banks—Regional

17. Aptiv PLC

Company Profile: Aptiv PLC
Market Cap (USD): $15.72 B
Country: Ireland
Sector: Irish Consumer Discretionary
Industry: Irish Auto Parts

18. Kingspan Group plc

Company Profile: Kingspan Group plc
Market Cap (USD): $15.52 B
Country: Ireland
Sector: Irish Industrials
Industry: Irish Building Products & Equipment

19. Bank of Ireland Group plc

Company Profile: Bank of Ireland Group plc
Market Cap (USD): $13.91 B
Country: Ireland
Sector: Irish Financials
Industry: Irish Banks—Regional

20. James Hardie Industries plc

Company Profile: James Hardie Industries plc
Market Cap (USD): $13.46 B (July 1, 2024)
Country: Ireland
Sector: Irish Basic Materials
Industry: Irish Building Materials

21. Allegion plc

Company Profile: Allegion plc
Market Cap (USD): $12.74 B
Country: Ireland
Sector: Irish Industrials
Industry: Irish Security & Protection Services

22. ICON Public Limited Company

Company Profile: ICON Public Limited Company
Market Cap (USD): $11.99 B
Country: Ireland
Sector: Irish Healthcare
Industry: Irish Diagnostics & Research

23. Smurfit Kappa Group plc

Company Profile: Smurfit Kappa Group plc
Market Cap (USD): $11.62 B (July 1, 2024)
Country: Ireland
Sector: Irish Consumer Discretionary
Industry: Irish Packaging & Containers

24. Jazz Pharmaceuticals plc

Company Profile: Jazz Pharmaceuticals plc
Market Cap (USD): $6.62 B
Country: Ireland
Sector: Irish Healthcare
Industry: Irish Biotechnology

25. DCC plc

Company Profile: DCC plc
Market Cap (USD): $6.56 B
Country: Ireland
Sector: Irish Energy
Industry: Irish Oil & Gas Refining & Marketing

26. Alkermes plc

Company Profile: Alkermes plc
Market Cap (USD): $4.76 B
Country: Ireland
Sector: Irish Healthcare
Industry: Irish Biotechnology

27. Glanbia plc

Company Profile: Glanbia plc
Market Cap (USD): $3.82 B
Country: Ireland
Sector: Irish Consumer Staples
Industry: Irish Packaged Foods

28. UDG Healthcare plc

Company Profile: UDG Healthcare plc
Market Cap (USD): $3.77 B (Aug. 1, 2021)
Country: Ireland
Sector: Irish Healthcare
Industry: Irish Medical Care Facilities

29. Perrigo Company plc

Company Profile: Perrigo Company plc
Market Cap (USD): $3.74 B
Country: Ireland
Sector: Irish Healthcare
Industry: Irish Drug Manufacturers—Specialty & Generic

30. Grafton Group plc

Company Profile: Grafton Group plc
Market Cap (USD): $2.66 B
Country: Ireland
Sector: Irish Industrials
Industry: Irish Building Products & Equipment

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