| # | Company | Employees |
|---|---|---|
| 1 | 4,937 | |
| 2 |
Aer Lingusaerlingus.com
National airline of Ireland operating modern fleet, connecting UK, Europe, North America via Dublin and Shannon airports with US Pre-Clearance. |
3,884 |
| 3 |
DCC plcdccenergy.com
A global group providing solutions in energy, healthcare, and technology sectors through diverse businesses across 22 countries, driving long-term value creation |
3,820 |
| 4 |
Beaumont Hospitalbeaumont.ie
A leading teaching hospital associated with RCSI Hospital Group, serving as a designated cancer and regional treatment center with strong academic links |
3,349 |
| 5 | 3,251 | |
| 6 |
An Postanpost.com
Provides postal, communication, retail, and financial services across Ireland with a large national network and over 10,000 employees. |
3,117 |
| 7 |
Zurich Insurance plczurich.com
Insurance provider with operations in Ireland and nine other European countries, part of a global network with over 55,000 employees worldwide |
2,910 |
| 8 |
St James's Hospital Dublinlinkin.bio
An academic teaching hospital delivering health treatment, care, and diagnosis while prioritizing education, research, and collaboration with a focus on quality and accountability |
2,788 |
| 9 |
Uisce Éireann Irish Waterwater.ie
National water utility ensuring secure, safe, and sustainable water services in Ireland by delivering quality drinking water and treating wastewater responsibly |
2,229 |
| 10 |
Mater Misericordiae University Hospitalmater.ie
Charitable hospital delivering specialized tertiary healthcare including heart surgery, transplants, spinal injuries, and national isolation services in North Dublin and Ireland. |
2,218 |
| 11 |
Iarnród Éireann Irish Railirishrail.ie
The national railway system operator in Ireland, providing intercity, commuter, and freight services within the Republic of Ireland and to Belfast |
2,157 |
| 12 |
St. Vincent's University Hospitalstvincents.ie
A leading academic teaching hospital providing acute, chronic, and emergency care across 50 medical specialties with international accreditation and pioneering patient care approaches |
2,000 |
| 13 |
Central Bank of Irelandcentralbank.ie
Safeguarding monetary and financial stability, ensuring financial system benefits consumers and economy, maintaining independence and public trust. |
1,983 |
| 14 |
Irish Lifeirishlife.ie
Leading Irish life, investment, and pension company offering innovative products with strong customer service and global expertise backing. |
1,966 |
| 15 |
Tallaght University Hospitaltuh.ie
One of Ireland's largest acute teaching hospitals providing adult, psychiatric, and age-related healthcare, specializing in urology, dialysis, robotic surgery, and trauma services |
1,943 |
| 16 |
Three Irelandthree.ie
Leading mobile telecommunications provider in Ireland, offering connected life through products, service, and extensive 4G and 5G network coverage. |
1,513 |
| 17 |
Mater Private Networkmaterprivate.ie
Advanced healthcare provider offering specialized services including Heart and Vascular, Spine, Cancer, Surgery, and Robotic-assisted Surgery, with a focus on patient-centered care and innovation |
1,471 |
| 18 |
Children’s Health Ireland (CHI)childrenshealthireland.ie
A leading children's hospital in Ireland with over 280 beds and 39 specialties, offering educational opportunities, support for career development, and various employee benefits |
1,430 |
| 19 |
Elavon Europeelavon.co.uk
A leading payments provider offering tailored solutions across Europe and the USA, with a focus on reliability, global connectivity, and customer service excellence |
1,241 |
| 20 |
St Vincent's Private Hospitalsvph.ie
Ireland's largest private hospital offering a wide range of specialist medical and surgical services, including cancer care, cardiology, and various other specialties |
1,137 |
| 21 |
Dublin Bus (Bus Átha Cliath)dublinbus.ie
Leading public transport provider in Ireland with a fleet of over 1000 buses operating on 125 routes, employing 3,600 people from 71 countries |
1,126 |
| 22 |
ESB Networksesbnetworks.ie
A subsidiary of ESB Group in Republic of Ireland operating and maintaining electricity distribution system, facilitating competitive market, and investing in network development |
1,113 |
| 23 | 992 | |
| 24 |
FBD Insurancefbd.ie
Providing insurance services to consumers, farmers, and businesses across Ireland with a strong local presence and customer support. |
919 |
| 25 |
Bus Éireannbuseireann.ie
A major provider of bus transportation services in Ireland, offering a wide range of inter-urban, city, commuter, school, and local bus services |
910 |
| 26 |
New Ireland Assurancenewireland.ie
Leading life and pensions company in Ireland providing insurance, investment, and retirement solutions to individuals and businesses through financial brokers and advisors |
784 |
| 27 |
The National Maternity Hospitalnmh.ie
A leading provider of maternity, gynecological, and reproductive care, offering high-quality treatment, research, education, and a supportive environment for women and families |
749 |
| 28 |
Virgin Media Irelandvirginmedia.ie
Leading cable and broadcast business in Ireland, providing award-winning broadband, TV, mobile, and home phone services Also, offering connectivity solutions for businesses and public sector |
703 |
| 29 |
Bord Gáis Energybordgaisenergy.ie
Bord Gáis Energy offers innovative energy services and solutions in Ireland, focusing on benefiting and serving over 750,000 customers since 1976 |
594 |
| 30 |
Rotunda Hospitalrotunda.ie
A leading voluntary provider of maternity, neonatal, and gynaecology care in Ireland, delivering innovative and safe services for over 274 years |
574 |
| 31 |
AXA Irelandaxa.ie
A leading insurance company in Ireland offering a wide range of insurance products to protect homes, cars, businesses, and farms Part of AXA Group |
489 |
| 32 |
Dublin Airportlinktr.ee
A major international airport located in Dublin, Ireland, serving as the primary entry point for millions of passengers annually Part of the daa Group |
484 |
| 33 |
Irish Blood Transfusion Servicegiveblood.ie
This organization supplies blood and blood products to hospitals in Ireland, while also encouraging individuals to become blood donors Visit their website for more information |
444 |
| 34 |
Allianz Irelandallianz.ie
Providing diverse insurance products including car, home, pet, SME, and commercial insurance to over 500,000 customers across Ireland. |
426 |
| 35 |
Transdev Irelandtransdevireland.ie
A leading public transport operator in Europe, providing high quality local transport services including tram, metro, train, bus, and coach networks |
157 |
| 36 |
NBC Global Finance Limited – Dublinnbcgf.ie
A European subsidiary of a Canadian bank, facilitating growth, diversification, and financial services in Europe for the parent company and its subsidiaries |
97 |
| 37 |
Greenval Insurance DACgreenval-insurance.com
An Irish insurance company specializing in fleet motor insurance, operating in multiple EU countries, offering liability and damage cover for Arval Group's fleet business |
46 |
| 38 |
BBPM Life dacbbpmlife.com
An Irish company provides Class III life insurance products across the EU under the freedom of services regime, tailored to customer needs |
36 |
| 39 |
Applegreen Fast Chargeapplegreenfastcharge.com
A fast-paced startup focusing on EV charging for long-range travel, driving innovation in the electric vehicle industry |
36 |
| 40 |
Irish Continental Group PLCicg.ie
Leading maritime transport group in Ireland transporting passengers, cars, roll-on roll-off freight, and container lift-on lift-off freight between Ireland, UK, and Continental Europe Operates container terminals in Dublin and Belfast |
32 |
| 41 |
Irish Ferries Freightirishferriesfreight.com
Leading ferry operator connecting Republic of Ireland, Britain, and France, offering RoRo services for passengers, vehicles, freight, inclusive holidays, with a modern fleet and high-quality travel experiences |
19 |
| 42 |
Greencoat Renewables PLCgreencoat-renewables.com
Invests in euro-denominated renewable energy infrastructure assets, focusing on large secondary markets in continental Europe to aggregate operating generation assets. |
4 |
| 43 |
EVO Payments Irelandevopayments.co.uk
The company specializes in payment processing services, offering international solutions for debit and credit card acceptance, transaction processing, and innovative payment solutions |
4 |
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How this list is built
Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Oct 24, 2026.
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