By Business & Finance Business & Finance’s 2026 Top 100 Index celebrates the leading companies operating in Ireland, highlighting the businesses driving growth, innovation and economic impact across the country.
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daa
Headquartered at Dublin Airport, daa is a global airport management and travel retail group with operations in 13 countries.
In Ireland, the company owns and operates the nation’s two largest airports, Dublin and Cork. Internationally, daa holds airport investments in Germany and Cyprus, while its consultancy arm, daa International, manages major airport operations in Saudi Arabia, including Jeddah and Red Sea International.
The Group’s global travel retail subsidiary, ARI, spans 13 countries across Europe, North America, the Middle East, India and Asia-Pacific.
Driven by a core purpose to connect Ireland with the world, daa’s vision is to be an airport industry leader.
Dalata Hotel Group
Founded in 2007, Dalata Hotel Group rapidly scaled during the 2008 financial crisis to become Ireland’s largest hotel operator.
Following a highly successful decade as a publicly traded company after its 2014 IPO, Dalata was acquired by a Scandinavian consortium, taking the company private.
Today, Dalata operates 56 hotels with over 12,000 rooms across Ireland, the UK, Germany and the Netherlands.
The group’s portfolio is primarily anchored by its two leading four-star brands, Clayton Hotels and Maldron Hotels, as it continues its strategic expansion into mainland Europe.
Dale Farm
As Northern Ireland’s largest farmer-owned dairy cooperative, Dale Farm comprises over 1,300 UK dairy farmers supplying products to both domestic and over 40 international export markets.
The cooperative recently delivered record financial results, with group turnover reaching £722.4 million and operating profits climbing to £37.7 million.
Demonstrating sustained commercial growth, Dale Farm has expanded its footprint through a completed £70 million investment in its automated cheddar processing facility in County Tyrone, significantly boosting output capacity and driving the business toward its sustainability goals.
Dawn Farms
Founded in 1985, family-owned Dawn Farms is the largest B2B specialist supplier of cooked meat, plant protein and fermented sausage ingredients outside the US.
As Europe’s leading multi-species cooked protein provider, the company offers a comprehensive range of toppings and ingredients designed for the global pizza, sandwich and prepared meal sectors.
Catering to shifting consumer trends with a growing selection of plant-based and alternative proteins, Dawn Farms exports to more than 50 international markets, serving global food brands from state-of-the-art manufacturing hubs in Ireland, the UK and Germany.
Dawn Meats
Founded in 1980, Dawn Meats is a family-owned global food business with an annual turnover exceeding €4.75 billion.
Operating across 13 countries with a team of 12,000 employees, the company directly sources grass-fed cattle and lamb from 30,000 family farms across Ireland and the UK.
Dawn Meats is a highly decorated industry leader in sustainability and corporate social responsibility, boasting multi-award-winning credentials from Bord Bia, the Green Food & Beverage Awards and a landmark Business Working Responsibly (BWR) accreditation across its entire Irish footprint.
DCC
Headquartered in Dublin, DCC plc is a leading international group transitioning to a pure-play focus on the energy sector under a major strategic reorganisation to become DCC Energy plc.
Listed on the London Stock Exchange and a constituent of the FTSE 100, the group is an international leader in multi-energy sales and distribution across Europe and the US, providing liquid gas, solar, and renewable solutions to millions of commercial, industrial, and domestic customers.
For the financial year ended 31 March 2026, DCC generated revenues of £15.4 billion and an adjusted operating profit of £634 million, reflecting its streamlined commercial focus on driving the global energy transition.
Diaceutics
Established in 2005, Diaceutics plc is a leading data analytics and commercialisation platform provider listed on the London Stock Exchange’s AIM market.
The company is a pioneer in precision medicine, working with 18 of the top 20 global pharmaceutical firms to streamline diagnostic testing and maximise patient access to targeted therapies.
At the heart of its business is DXRX – The Diagnostic Network®, an AI-powered commercialisation platform that integrates real-world diagnostic testing data from a global network of laboratories.
Driven by a three-year compound annual growth rate (CAGR) of 25%, Diaceutics delivers over £38.4 million in annual revenue with a robust, multi-year order book, positioning the self-funded company as the premier end-to-end partner for global precision medicine launches.
Ding
Founded in 2006, Ding is the world’s leading international mobile top-up platform, created with a mission to bridge the digital divide and keep people securely connected.
Users have successfully sent over half a billion top-ups globally via the Ding app, Ding.com, a vast network of 600,000+ retail outlets and an expanding B2B API partner network. Delivering a top-up every second, Ding connects users to 750+ operators across more than 160 countries.
Headquartered in Dublin, Ireland, the company employs a diverse global workforce supported by a strategic network of international regional offices.
Dole plc
Dole plc is a global leader in the production, marketing and distribution of fresh produce.
Driven by an iconic brand trusted worldwide, the company offers a comprehensive portfolio of over 300 fresh fruit and vegetable product lines.
Dole operates an advanced, vertically integrated supply chain that spans 30 countries, incorporates over 250 facilities and utilises approximately 32,000 employees globally.
By maintaining direct control from farm to store, Dole ensures the reliable delivery of high-quality, nutritious food while driving sustainable, long-term value for its global stakeholders.
E+I Engineering
Operating as part of global critical infrastructure leader Vertiv (NYSE: VRT), Vertiv E&I Engineering is the largest electrical switchgear and power distribution manufacturer in the UK and Ireland.
Backed by four decades of industry experience, the company specialises in custom, in-house integrated power solutions tailored to complex, large-scale client projects.
Vertiv E&I Engineering places a strong emphasis on technical excellence, utilising a highly qualified global team of Chartered Engineers across manufacturing facilities on three continents: Europe, North America and Asia.
From design to installation, the company delivers premium technical services, robust project management and dedicated lifecycle customer support.
eir
As the principal provider of fixed-line and mobile telecommunications services in Ireland, eir supports approximately 2 million customers across the country.
The company operates Ireland’s most extensive telecommunications network in both capacity and geographic reach, delivering an advanced suite of voice, data, broadband, and TV services to residential, small business, enterprise, and government sectors.
eir’s mobile division operates under the consumer-facing eir and GoMo brands, while its wholesale arm, open eir, remains the largest wholesale operator in Ireland. Reflecting consistent commercial growth, the group generated a reported revenue of €1.35 billion and an adjusted EBITDA of €640 million.
Energia
Energia Group is a leading all-island integrated energy business specialising in Renewables, Flexible Generation and Customer Solutions. Following its landmark €2.5 billion acquisition by Ardian, the group continues to power the green transition, supplying 17% of Ireland’s total electricity and 20% of its wind energy.
Through its dual retail brands, Energia and Power NI, the company delivers electricity and gas to 800,000 customers. Powered by over 800 employees, an expanding network of 16 wind farms and two modern gas-fired stations, Energia Group remains a benchmark for sustainable energy distribution, proudly holding Ireland’s Business Working Responsibly accreditation.
Ergo
Headquartered in Dublin, Ergo (a Presidio company) is the largest IT services and managed services provider in Ireland.
Founded in 1993 as a small, eight-person print components specialist, the company has evolved over more than 30 years into a premier digital transformation partner for the region’s largest enterprises.
Now backed by Presidio’s global scale, Ergo leverages leading-edge technologies across cloud computing, cybersecurity, data, and AI to drive enterprise productivity and profitability.
Recognised widely for its vendor elite accreditations, including holding the title of Microsoft Partner of the Year, Ergo combines agile IT resourcing with deep technical expertise to keep clients competitive in a shifting technological landscape.
ESB
Established in 1927, the Electricity Supply Board (ESB) is Ireland’s leading commercial semi-state energy utility.
Having evolved from its historical monopoly roots into a top competitor in the deregulated all-island market, ESB operates across the entire electricity lifecycle, spanning generation, transmission, distribution and supply.
The Group employs nearly 10,000 people and manages a regulated asset base of approximately €15 billion.
Globally recognised for its infrastructure footprint, ESB commands a 24% share of the all-island generation market, while its infrastructure division maintains grid connections for 2.4 million customers.
Through its retail arm, Electric Ireland, the group delivers power solutions to over 1.2 million accounts, anchoring its forward-facing strategy in a commitment to reach net-zero carbon emissions by 2040.
FD Technologies
Headquartered in Newry, County Down, FD Technologies plc is a pure-play technology group focused entirely on its high-growth data and AI software division, KX.
Following the strategic divestment of its legacy consulting arm (First Derivative) to EPAM Systems, the company streamlined its corporate structure to focus strictly on enterprise software.
Driven by its ultra-fast kdb+ database technology, KX provides real-time operational intelligence and generative AI infrastructure to global financial institutions, manufacturing giants, and energy sectors.
Fenergo
Founded in Dublin in 2009, Fenergo is a global leader in cloud-native Client Lifecycle Management (CLM) and Know Your Customer (KYC) digital solutions.
The company provides a comprehensive software suite that enables over 100 major financial institutions to automate regulatory compliance workflows, streamline onboarding and deliver seamless customer experiences.
In 2021, Fenergo achieved unicorn status following a landmark acquisition by private equity firms Astorg and Bridgepoint. Supported by a global team of over 850 experts operating across 15 international hubs, Fenergo continues to pioneer the RegTech sector by heavily investing in its core SaaS framework and deploying advanced, generative AI-driven compliance agents to accelerate business growth safely.
Fexco
Headquartered in Killorglin, Co. Kerry, Fexco is one of Ireland’s most successful indigenous multinationals, leveraging more than 40 years of expertise in financial services, fintech and managed business solutions.
As an independent, privately owned entity, Fexco has scaled its global footprint to operate across 60 countries, supported by a diverse workforce of over 3,600 people worldwide.
The group is an international leader in transaction processing, managing over €46 billion in annual volume through more than 60 acquiring bank partners and a network of 570,000+ merchant partners.
Committed to sustainable innovation and regional development, Fexco actively reinvests in its local and international communities while delivering world-class payment and FX infrastructure.
Flutter Entertainment
Flutter Entertainment plc (NYSE: FLUT) is the global powerhouse in online sports betting, iGaming and entertainment.
Formed by the 2016 merger of Paddy Power and Betfair, the group has successfully transitioned its primary listing to the New York Stock Exchange to capture the rapidly growing North American market, where its flagship FanDuel brand holds the number-one sportsbook position.
Backed by a diverse portfolio of international brands, Flutter serves 15.9 million monthly players and generates an annual revenue of $16.38 billion.
Supported by strong operational cash flow, Flutter continues to maximise shareholder value, underscored by a comprehensive $5 billion multi-year share buyback program.
Gas Networks Ireland
Headquartered in Cork, Gas Networks Ireland is the commercial semi-state body responsible for operating and maintaining Ireland’s 14,758 km national gas transmission and distribution system.
The network safely delivers energy to more than 720,000 domestic, commercial and industrial customers, uniquely powering over 41% of the country’s total electricity generation.
Under its “Pathway to a Net Zero Carbon Network,” the utility is actively transitioning its infrastructure to transport 100% renewable gases, such as biomethane and green hydrogen, with the goal of full decarbonization by 2045.
Accelerating this green transition, Gas Networks Ireland invested over €188 million in network infrastructure and successfully integrated 61 GWh of biomethane into the system. The company also operates Aurora Telecom, a premier national dark fibre network.
Glanbia
Glanbia plc is a global powerhouse in the nutritionals industry, delivering B2B ingredient solutions and flagship consumer sports nutrition brands.
Operating via its core Health & Nutrition and Dairy Nutrition divisions, the company has transitioned from its traditional dairy roots into an international food-tech innovator.
Glanbia is the world’s largest supplier of whey-based ingredients and the leading producer of American-style cheddar cheese.
Supported by a direct corporate presence in 21 countries and an annual group revenue of $3.9 billion, Glanbia leverages an advanced global supply chain to provide functional, data-backed nutrition solutions to the world’s premier food and beverage brands.
Glen Dimplex
Headquartered in Dublin, Glen Dimplex is a leading, privately owned international manufacturing and technology solutions group.
Backed by over 50 years of engineering heritage, the company connects more than 8,000 people across an international footprint spanning 20 countries. The business specialises in low-carbon electric solutions across four key divisions: Heating & Ventilation, Precision Cooling, Flame and Consumer Appliances.
Its largest division, Heating & Ventilation, delivers market-leading intelligent heating, cooling and ventilation infrastructure for the commercial and residential sectors under flagship brands like Dimplex.
Strategically focused on climate action, Glen Dimplex leverages its global distribution networks to accelerate the electrification of heat and enable a sustainable, energy-efficient world.
Grafton Group
Headquartered in Dublin and listed on the London Stock Exchange as a FTSE 250 constituent, Grafton Group plc is a leading international building materials distributor and DIY retailer.
The Group operates a diversified European footprint across four primary geographic segments: the Island of Ireland, Great Britain, Northern Europe (the Netherlands and Finland) and Iberia (Spain).
Trading from approximately 470 branches with a global workforce of 10,000 colleagues, Grafton generates £2.52 billion in annual revenue.
By driving the growth of trusted, market-leading regional brands, including Chadwicks, Selco, Woodie’s and Salvador Escoda, Grafton pairs deep localised expertise with the financial strength and structural resilience of a major multinational.
Greencoat Renewables
Headquartered in Dublin, Greencoat Renewables PLC is a leading sector-focused investor in euro-denominated renewable energy infrastructure.
The company commands a total installed capacity of 1.4 GW across a diversified portfolio of 36 wind, solar and storage assets spanning five stable European markets: Ireland, Germany, France, Spain and Sweden. Initially launched on Euronext Growth Dublin and the London Stock Exchange’s AIM market in July 2017, the firm expanded its investor reach with a secondary listing on the Johannesburg Stock Exchange (JSE).
The company is managed by Schroders Greencoat LLP, a premier global specialist in energy transition infrastructure.
Central to the group’s corporate strategy is a balanced capital allocation framework that enables the transition to a net-zero carbon economy while generating reliable, inflation-protected returns.
This commercial growth directly funds local environmental initiatives, contributing millions toward community and social projects in its operational regions.
Greencore
Headquartered in Dublin, Ireland, Greencore Group plc is a FTSE 250 leader and a premier international manufacturer of convenience and fresh prepared foods.
Following its landmark £1.2 billion acquisition of Bakkavor Group plc, the combined organisation has transformed into a global industry powerhouse, generating approximately £4 billion in revenue and employing a workforce of around 28,000 people.
Greencore is the primary supplier to all major UK supermarkets, convenience outlets, discounters and coffee shops, holding dominant market shares across food-to-go categories, such as sandwiches, salads and sushi, as well as chilled ready meals, soups and sauces.
Backed by a vast network of state-of-the-art manufacturing hubs across the UK and the United States, the group pairs advanced culinary innovation with high-precision logistics to seamlessly execute thousands of direct-to-store fresh food deliveries every day.
ICON Plc
ICON plc is a global clinical research organisation that provides outsourced development and commercialisation services to the pharmaceutical, biotechnology and medical device industries.
Founded in Dublin in 1990, ICON has grown through both organic expansion and acquisitions to operate across multiple regions worldwide, supporting clinical development programs for life sciences companies.
The company is publicly listed and has a significant presence in North America, Europe and other international markets.
