These are large multinational companies with significant operations in Ireland, spanning a diverse range of sectors from industrial manufacturing to retail and technology. Accenture provides professional services globally, while Johnson Controls leads in smart building solutions. Eaton specializes in intelligent power management, and Smurfit Westrock is a global provider of paper-based packaging. Primark is an international fashion retailer, and Ryanair is Europe's largest airline group.
Dublin emerges as a prominent hub, with many of these large employers headquartered there. This concentration indicates a strong presence of global corporate operations and services within the capital, alongside specialized manufacturing in other regions like Cork and Galway.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Accentureaccenture.com
It provides professional services to businesses and governments, focusing on digital transformation, operational optimization, and enhancing citizen services globally. |
687,682 | |||
| 2 |
Johnson Controlsjohnsoncontrols.com
Global leader in transforming environments through smart, healthy, and sustainable buildings Offering innovative digital solutions for various industries worldwide |
67,718 | |||
| 3 | 51,011 | ||||
| 4 |
Smurfit Westrocksmurfitwestrock.com
Global provider of innovative paper-based packaging solutions with extensive operations, mills, and a large workforce across multiple countries. |
50,141 | |||
| 5 |
Smurfit Kappasmurfitwestrock.com
A global provider of sustainable paper-based packaging solutions, offering innovative products and expertise to drive success for customers worldwide |
48,000 | |||
| 6 |
Primarkprimark.com
International fashion retailer, over 470 stores, offering affordable fashion and everyday essentials at unbeatable prices for everyone. |
45,876 | |||
| 7 |
TE Connectivityte.com
A global leader in industrial technology manufacturing, specializing in connectivity and sensor solutions for various industries to create a safer, sustainable, and connected future |
41,478 | |||
| 8 |
Musgravemusgravegroup.com
Leading food retail, wholesale, and foodservice provider in Ireland with 19 market-leading brands, supporting thousands of family businesses and jobs. |
41,000 | |||
| 9 |
ICON plciconplc.com
A global company founded in Ireland in 1990, specializing in accelerating the development of drugs and devices to save lives and improve quality of life |
35,001 | |||
| 10 |
Weatherfordweatherford.com
A global energy services company with 17,000 team members in 75 countries, providing solutions for the challenges of the energy industry |
29,301 | |||
| 11 |
Ryanair - Europe's Favourite Airlineryanair.com
Europe's largest airline group, offering over 3,000 daily flights to 225 airports, with a plan to carry 225m+ guests annually |
21,217 | |||
| 12 | 16,755 | ||||
| 13 |
Cimpresscimpress.com
Cimpress plc invests in mass-customization businesses, providing personalized products to meet individual customer needs with near mass production efficiency |
12,460 | |||
| 14 |
Keywords Studioskeywordsstudios.com
A leading creative services provider for the global video games industry, offering end-to-end solutions and support across all aspects of game development |
11,828 | |||
| 15 |
Allerganabbvie.com
The company discovers and delivers innovative medicines in various therapeutic areas including immunology, oncology, neuroscience, eye care, and more |
9,833 | |||
| 16 |
University College Dublinucd.ie
Research-intensive university offering undergraduate, masters, PhD education, fostering innovation, global engagement, and diverse academic disciplines across multiple campuses. |
8,585 | |||
| 17 |
Flutter Entertainmentflutter.com
Global provider of sports betting, gaming, and entertainment, serving over 18 million customers worldwide through leading consumer brands Vision to be global online leader |
7,681 | |||
| 18 |
ICON Strategic Solutionsiconplc.com
Global leader in Functional Service Provision services, offering cost-saving FSP models and clinical expertise to improve business performance Providing industry insights and job opportunities |
7,496 | |||
| 19 |
Trinity College Dublintcd.ie
Leading Irish university offering world-class education and research, recognized globally for academic excellence and high international rankings. |
7,268 | |||
| 20 | 7,256 | ||||
| 21 |
Allegionallegion.com
Global leader in seamless access solutions for homes, businesses, schools, and institutions, specializing in securing people and assets around the door |
7,123 | |||
| 22 |
Descon Engineering Limiteddescon.com
An integrated engineering services and manufacturing company operating in Pakistan and the Middle East, delivering client-specific solutions for Energy, Infrastructure, and Process industries |
6,444 | |||
| 23 |
Perrigo Company plcperrigo.com
European Consumer Self-Care market top player, U.S. store brand over-the-counter and infant formula provider, offering trusted health and wellness solutions. |
5,088 | |||
| 24 | 4,937 | ||||
| 25 |
University of Galwayuniversityofgalway.ie
Irish research-led academic institution providing high-quality teaching and excellence in research while fostering strong community outreach and support for the Irish language. |
4,759 | |||
| 26 | 4,748 | ||||
| 27 |
PM Grouppmgroup-global.com
Specializes in designing, constructing, and commissioning high-tech facilities for pharma, food, data centers, medical technology, manufacturing, and energy sectors globally. |
4,477 | |||
| 28 |
Glanbiaglanbia.com
A global nutrition company creating better products, sustainable practices, and high-quality nutrition to help people live full, healthy lives |
4,176 | |||
| 29 |
Flutter Internationalcareers.flutterinternational.com
Global sports betting, gaming, and entertainment provider with innovative brands focused on championing play, empowerment, and teamwork for millions of customers worldwide |
4,076 | |||
| 30 |
Version 1version1.com
IT services and solutions provider trusted by global brands, offering independent advice to navigate the evolving IT landscape and drive customer success |
3,944 | |||
| 31 |
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 | |||
| 32 |
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 | |||
| 33 |
Jazz Pharmaceuticalsjazzpharma.com
Global biopharmaceutical company focused on developing innovative medicines for serious diseases with limited treatment options to improve patient lives. |
3,643 | |||
| 34 |
Mallinckrodt Pharmaceuticalsmnk.com
Specializing in specialty pharmaceuticals, we develop, manufacture, and distribute innovative treatments for underserved patient populations across various medical fields |
3,400 | |||
| 35 |
Concern Worldwideconcern.net
International humanitarian organization working with poorest communities to improve lives and influence policies reducing extreme poverty globally. |
3,327 | |||
| 36 |
Tyco SimplexGrinnelltycosimplexgrinnell.com
A global leader in fire protection, security, HVAC, building controls, and energy storage, delivering customized solutions to meet customers' needs |
3,232 | |||
| 37 | 3,179 | ||||
| 38 |
Jones Engineeringjoneseng.com
Multi-disciplined engineering contracting company providing a complete range of engineering and building services installations globally, working with multi-nationals and delivering projects safely |
3,019 | |||
| 39 |
KPMG Irelandkpmg.ie
A leading provider of audit, tax, and advisory services for domestic and international clients across all sectors, specializing in driving value and navigating change |
2,978 | |||
| 40 |
Digital Marketing Institutedigitalmarketinginstitute.com
This company offers online digital marketing courses aligned with industry needs, providing skills, industry insights, and a supportive community for professionals |
2,912 | |||
| 41 |
Kingspan Groupkingspan.com
Global leader in high-performance insulation and building envelope solutions for construction, aiming to improve building performance and create a sustainable future |
2,910 | |||
| 42 |
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 | |||
| 43 |
Mercurymercuryeng.com
Design and manage complex engineering and construction projects for leading corporations, delivering innovative solutions that connect communities and businesses. |
2,864 | |||
| 44 |
Planetweareplanet.com
The company provides software, payment, and technology solutions for the Hospitality and Retail sectors globally, focusing on innovative digital commerce platforms |
2,825 | |||
| 45 |
Smyths Toys Superstoressmythstoys.com
Retailer specializing in a wide range of children's toys, video games, baby products, and outdoor play items across multiple stores. |
2,806 | |||
| 46 |
Lidl Irelandlidl.ie
Retail grocery chain offering high-quality products at low prices, operating numerous stores across Ireland and Northern Ireland with a large workforce. |
2,706 | |||
| 47 |
IPL Schoelleriplschoeller.com
Design and manufacture smart, reusable circular packaging solutions supporting efficient, scalable, and sustainable supply chains across multiple industries worldwide. |
2,704 | |||
| 48 |
Paddy Powercareers.flutteruki.com
International sports betting and gaming operator with leading brands in the UK, Ireland, Australia, and the USA, offering online and mobile services to millions of customers worldwide |
2,668 | |||
| 49 |
John Sisk & Son Ltdsisk.com
Innovative engineering and construction company with extensive operations across Ireland, UK, and Europe, providing comprehensive construction services since 1859. |
2,593 | |||
| 50 |
Applegreenapplegreenstores.com
Roadside hospitality convenience retailer with inviting spaces, quality amenities, EV charging, trusted brands, own food and coffee brands, focusing on guest experience. |
2,576 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 51 |
Marcus Evans Groupmarcusevans.com
A global leader in business intelligence, offering diverse portfolios including summits, conferences, professional training, and market intelligence to help clients achieve strategic goals |
2,543 | |||
| 52 |
PwC Irelandpwc.ie
Global network providing assurance, advisory, and tax services with a commitment to quality and building trust in society. |
2,502 | |||
| 53 |
Alkermesalkermes.com
A neuroscience-focused company developing innovative medicines for psychiatric and neurological disorders, with a strong focus on patient well-being and community support |
2,397 | |||
| 54 | 2,343 | ||||
| 55 |
S&W Irelandswgroup.com
Providing expert tax, accountancy, assurance, and advisory services to support Irish and international businesses through growth, risks, and exits. |
2,293 | |||
| 56 |
Iarnr贸d 脡ireann 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 | |||
| 57 |
PokerStarscareers.flutterinternational.com
Leading global poker platform committed to quality entertainment Empowering team members to bring pace, responsibility, and team spirit to create unique experiences worldwide |
2,046 | |||
| 58 |
Covalencovalensolutions.com
A trusted partner providing agile outsourcing solutions to Fortune 500 companies, offering multilingual services in customer experience, operations, and trust & safety |
2,030 | |||
| 59 |
Origin Enterprises Plcoriginenterprises.com
Provides technically-led agricultural solutions promoting sustainable land use, empowering customers across multiple countries to maximize land potential. |
1,956 | |||
| 60 |
Linesightlinesight.com
Provides professional consultancy, management support, and strategic advice to the global construction industry from concept to completion across diverse sectors worldwide. |
1,931 | |||
| 61 |
Tesco Irelandtescoireland.ie
Large Irish retailer. Serves customers and communities. Supports local suppliers. Provides diverse career opportunities across retail, head office, and distribution centers. |
1,905 | |||
| 62 |
GOAL Globalgoalglobal.org
Specializing in emergency response, health, nutrition, food security, and livelihoods, we support vulnerable communities in crises, poverty, and exclusion |
1,860 | |||
| 63 |
BrowserStackbrowserstack.com
Provides instant access to thousands of real devices and browsers for functional, visual, and performance testing through AI-powered cloud infrastructure and tools. |
1,797 | |||
| 64 |
Aldi Irelandaldirecruitment.ie
Established in 1913, this global retailer operates over 6,500 stores worldwide, including in Ireland, the UK, Europe, Australia, China, and the USA |
1,771 | |||
| 65 | 1,768 | ||||
| 66 |
Circet IRE & UKcircet.ie
Industry-leading company providing fully managed services to the Telecommunications, Transport Infrastructure, and Power Sectors in Ireland, UK, and internationally since 1975 |
1,753 | |||
| 67 |
MSD Irelandmsd-ireland.com
A leading biopharmaceutical company dedicated to inventing life-saving medicines and vaccines for challenging diseases, with a focus on research and improving health worldwide |
1,697 | |||
| 68 |
Kirby Group Engineeringkirbygroup.com
A leading Mechanical and Electrical engineering contractor offering HV/MV design & build services, off-site manufacturing, and expertise in Data Centres, Life Sciences, and more |
1,683 | |||
| 69 |
Creditsafecreditsafe.com
A global provider of business credit reports and information, empowering companies with data to make informed decisions and drive growth |
1,670 | |||
| 70 |
Waystonewaystone.com
Global provider of governance, administration, risk, and compliance services supporting institutional investors and asset managers in managing investment structures. |
1,610 | |||
| 71 |
Playrixplayrix.com
A top mobile game company with 120 million monthly players, attributing its success to a talented global team prioritizing people over ideas |
1,599 | |||
| 72 |
Deloitte Irelanddeloitte.com
Global professional services network delivering solutions and insights to address complex business challenges, with leadership capabilities, experience, and collaboration with clients |
1,594 | |||
| 73 | 1,477 | ||||
| 74 |
Enterprise Irelandenterprise-ireland.com
Supporting Irish enterprises in international markets through development, growth, innovation, and export sales to drive employment and economic growth |
1,475 | |||
| 75 |
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 | |||
| 76 | 1,460 | ||||
| 77 |
Morgan McKinleymorganmckinley.com
Global talent services expert providing recruitment, executive search, and talent acquisition solutions across multiple professional disciplines worldwide. |
1,430 | |||
| 78 |
H&MV Engineeringhmvengineering.com
Global provider of specialist design, engineering, and construction services for data centers, substations, renewables, manufacturing, & pharmaceuticals with a focus on safety and sustainability |
1,427 | |||
| 79 |
Independent Contractorcodertal.com
Codertal connects big IT companies with top-tier IT contractors, offering on-demand services, software development, recruitment assistance, and cost-effective staffing solutions |
1,410 | |||
| 80 |
Kepak Groupkepak.com
Irish-based meat processor with multiple facilities, producing fresh and value-added meat products for international foodservice and retail markets. |
1,409 | |||
| 81 | 1,396 | ||||
| 82 |
Glanbia Performance Nutrition (GPN)glanbia.com
A global nutrition company focused on inspiring people to achieve performance, healthy lifestyle, and weight management goals through various leading brands |
1,354 | |||
| 83 |
Department of Foreign Affairs and Trade, Irelandireland.ie
This company represents Ireland's interests internationally, promotes investment and tourism, provides consular services to citizens abroad, and supports Irish communities worldwide |
1,341 | |||
| 84 |
Designer Groupdesignergrp.com
International provider of innovative electrical and mechanical services, sustainable energy solutions, and industrial solutions, with a focus on safety, quality, and sustainability |
1,335 | |||
| 85 |
Leonardo Hotels UK & Irelandleonardohotels.co.uk
A rapidly expanding hotel chain with over 150 hotels in 13 countries, offering comfortable accommodation for business and leisure guests with excellent amenities |
1,335 | |||
| 86 |
Dole plcdoleplc.com
The company grows, sources, packs, markets, and distributes fresh produce globally, focusing on quality, sustainability, and healthy eating from farm to fork. |
1,306 | |||
| 87 |
ABP Food Groupabpfoodgroup.com
Largest beef processor in Ireland and UK with renewable energy, pet food, and protein divisions employing over 14,000 people. |
1,300 | |||
| 88 | 1,278 | ||||
| 89 |
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 | |||
| 90 |
IPLiplschoeller.com
A top packaging provider offering sustainable solutions for various industries including food, consumer, agriculture, logistics, and the environment |
1,208 | |||
| 91 |
BOYLE Sportscareers.boylesports.com
A leading independent bookmaker offering betting and gaming services in Ireland, UK, and international markets, with over 375 shops and 2,700 employees globally Proud sponsors of various sports events |
1,199 | |||
| 92 |
Actavoactavo.com
An international strategic operations partner with diverse services, delivering excellence through rigorous quality standards, safety performance, and customer experience |
1,175 | |||
| 93 |
AMCS Groupamcsgroup.com
Global leader in integrated software and vehicle technology for environmental, waste, recycling, and EHSQ industries, improving efficiency, margins, and customer service |
1,165 | |||
| 94 |
Matheson LLPmatheson.com
A global legal services provider with expertise in various practice areas, serving internationally focused companies and financial institutions operating in Ireland |
1,139 | |||
| 95 |
JJ Rhatigan & Companyjjrhatigan.com
A leading general building contractor in Ireland and London, specializing in high-quality, sustainable construction projects for various sectors including commercial, residential, healthcare, and more |
1,114 | |||
| 96 | 1,100 | ||||
| 97 |
Tirl谩ntirlan.com
A world-class food and nutrition business with a diverse portfolio of products for consumer, agri, and international markets, focusing on sustainability and innovation |
1,095 | |||
| 98 |
Suir Engineeringsuireng.com
A company with 40 years of international expertise in electrical, mechanical, and high voltage services, specializing in various sectors across Europe |
1,078 | |||
| 99 |
Anord Mardixanordmardix.com
Global leader in critical power distribution and protection, offering bespoke solutions and innovative products Part of a $24B diversified manufacturer |
1,074 | |||
| 100 |
Ivy Technologyivytech.com
Global provider of electronics repair and service for tech, med-tech, and telecom companies with innovative, efficient, and trustworthy solutions. |
1,067 | |||
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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 Nov 11, 2026.
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