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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Fin
Intercom develops Fin, an AI Customer Agent that helps companies deliver customer experiences across support, sales and commerce.
Fin is used by over 30,000 companies and resolves more than 2 million conversations each week. The product is part of Intercom’s AI-focused platform, which has been rebuilt around autonomous customer service capabilities since the company’s founding in 2011.
Intercom is founder-led and employs over 1,400 people across six global offices.
Inver Energy
Inver Energy is an Irish fuel importation and distribution company headquartered in Cork. The company supplies and distributes fuels across Ireland and operates fuel storage and logistics infrastructure, including facilities at key energy terminals.
Founded in 1983, Inver Energy was acquired in 2017 by Greenergy and continues to operate under its existing brand within the broader Greenergy group. The company focuses on fuel importation, storage and distribution services for the Irish market.
Johnson Controls
Johnson Controls is a global company that develops and provides building technology and solutions for commercial, industrial and institutional facilities.
The company focuses on building systems such as heating, ventilation, air conditioning (HVAC), fire safety and security, as well as related services aimed at improving building efficiency and operational performance.
Johnson Controls serves sectors including healthcare, education, data centres and manufacturing, supporting the operation and management of complex building environments.
Kainos
Kainos is a UK-headquartered digital technology company that provides software development and digital transformation services to public, healthcare and commercial organisations.
The company delivers services across cloud platforms, application development, data solutions, and automation, supporting clients in the design, build and maintenance of digital systems.
Kainos is a long-standing partner of Workday, supporting customers in implementing, extending and maintaining Workday enterprise software systems. The company operates internationally across Europe and the Americas and employs several thousand people.
Keelings
Keelings is a family-owned Irish fresh produce company founded in 1926. The business is involved in growing, sourcing, packing and distributing fresh fruit and vegetables for retail and foodservice customers.
Keelings operates across Ireland and international markets, with activities spanning the fresh produce supply chain including farming, importation and distribution. The company employs staff across multiple locations and business functions related to fresh produce operations.
Caroline Keeling has served as Chief Executive Officer since 2012, leading the company’s development in the fresh produce sector under its “Better Food Better World” purpose.
Kepak
Kepak Group is an Irish meat processing company with operations in Ireland and the United Kingdom. The company supplies beef, lamb and other meat products to retail, foodservice and manufacturing customers.
Kepak operates multiple processing facilities across Ireland and the UK and works with livestock producers to source and process meat products for domestic and international markets. The company has expanded its branded and value-added product offering in selected international markets, including the United States.
Kepak is a family-owned business with origins in the Irish meat trade and continues to operate across a range of meat processing and food supply chain activities.
Kerry Group
Kerry Group is a global taste and nutrition company founded in 1972 in Listowel, County Kerry, Ireland. The company has evolved from its origins in dairy processing into a multinational supplier of food ingredients, flavours and nutrition solutions.
Kerry Group is publicly listed and operates in markets across Europe, the Americas, Asia-Pacific and other international regions. The company develops and supplies ingredient solutions and technologies used in food, beverage and pharmaceutical applications, with a global manufacturing and R&D footprint.
Keywords Studios
Keywords Studios is an international provider of technical and creative services to the video games industry. The company supports game developers and publishers with services spanning game development support, art production, testing, localisation and audio services across the full development lifecycle.
Founded in Dublin, Keywords Studios grew significantly through expansion and acquisitions and was listed on the London Stock Exchange in 2013. The company operates a global network of studios across multiple countries, employing thousands of staff worldwide.
Lakeland Dairies
Lakeland Dairies is a dairy co-operative headquartered in County Cavan, Ireland. The co-operative collects milk from approximately 3,200 farm family shareholders across multiple counties in Ireland and Northern Ireland.
It is one of the largest dairy processors on the island of Ireland and the largest in Northern Ireland, operating several processing facilities across Ireland. The co-operative processes milk into a range of dairy products and exports to markets worldwide, including Europe, North America, Asia and other international regions.
Lakeland Dairies operates as an international dairy business with sales and distribution activities in Ireland, the United Kingdom and the United States.
Layden Group
Layden Group is an Irish family-owned property investment and development company founded in 1978 by Joseph P. Layden. The group is involved in the ownership, development and management of commercial and mixed-use properties.
The company’s portfolio includes leased commercial spaces occupied by a range of business tenants, including small and medium-sized enterprises, across Ireland. It continues to operate as a privately owned property group with long-term investments in the Irish real estate sector.
LetsGetChecked
LetsGetChecked is a healthcare diagnostics company founded in 2015 that provides at-home testing services, virtual clinical consultations, and related healthcare support services.
The company operates a vertically integrated model that coordinates sample collection, laboratory analysis, clinical review and prescription fulfilment through partner networks. Its services enable consumers to access diagnostic testing for a range of health conditions without visiting traditional clinical settings.
LetsGetChecked is co-headquartered in Dublin and New York and operates in markets including the United States, the United Kingdom and parts of Europe.
Mainstream Renewable Power
Mainstream Renewable Power is a global renewable energy developer focused on the development and delivery of utility-scale wind and solar projects across multiple international markets, including Europe, Latin America, Africa and Asia-Pacific.
The company develops onshore and offshore wind as well as solar energy projects and has an international development pipeline spanning multiple gigawatts of capacity. The company continues to operate as a project developer focused on advancing renewable energy assets toward construction and operation across global markets.
Maxol
Maxol Group is a family-owned Irish forecourt retail company founded in 1920. The company operates a network of service stations across Ireland and Northern Ireland, providing fuel, convenience retail and related services.
Maxol is active in fuel distribution and forecourt retail, including convenience food offerings and ancillary services at its service station locations. The group operates through company-owned and independently operated sites and employs staff across its retail and support operations.
The business continues to evolve its forecourt model in response to changes in fuel, mobility and retail trends.
Mercury Engineering
Mercury Engineering is an Irish-based European engineering and construction company founded in 1972. The company delivers complex building and infrastructure projects for multinational clients, with a focus on sectors such as data centres, life sciences and advanced manufacturing.
Mercury employs approximately 2,000 people and operates across multiple European markets. The company rebranded in 2019 and continues to specialise in the delivery of large-scale engineering and construction projects for global customers.
Meta Ireland
Meta Platforms is a global technology company that develops digital platforms and services focused on social networking, messaging, and immersive technologies.
The company operates several major products, including Facebook, Instagram and WhatsApp, which together serve billions of users worldwide. Meta also develops technologies in areas such as virtual and augmented reality through its Reality Labs division.
Meta’s platforms are primarily supported by advertising and are used by individuals, creators, and businesses for communication, content sharing, and digital engagement at global scale.
Moy Park
Moy Park is a poultry producer headquartered in Craigavon, Northern Ireland, and one of the largest food manufacturing companies in the region. Founded in 1943, the company produces and supplies poultry products across the UK and European markets.
Moy Park operates as part of Pilgrim’s Pride following its acquisition in 2017 and is now part of Pilgrim’s European operations while continuing to operate under the Moy Park brand.
The company employs several thousand people across production and processing facilities in Northern Ireland and other UK locations, and remains a significant contributor to the regional agri-food sector.
Musgrave
Musgrave Group is an Irish family-owned food retail, wholesale and distribution company founded in 1876. Headquartered in Cork, the group supplies food products and operates retail and wholesale services across Ireland and other markets.
Over its history, Musgrave has expanded from its origins as a grocery business into a large-scale retail and supply chain operator, working with independent retailers and managing retail brands across the food sector. The company remains privately owned and continues to operate across retail, wholesale and foodservice channels.
National Broadband Ireland
National Broadband Ireland is the company responsible for delivering the Irish Government’s National Broadband Plan, a national project to provide high-speed fibre broadband to rural areas of Ireland. The company designs, builds and operates a wholesale fibre network intended to support long-term broadband connectivity across underserved regions.
The network operates on an open-access model, allowing multiple internet service providers to offer services over the infrastructure once deployment is completed in each area.
National Broadband Ireland was established by Granahan McCourt, which has experience investing in telecommunications and infrastructure projects internationally.
Nearform
NearForm is a software engineering company founded in 2011 in Tramore, Ireland. The company designs and builds digital products, platforms and data solutions for public and private sector clients, with a strong focus on open-source technologies and cloud-native architectures.
NearForm operates internationally and delivers software engineering services to organisations across Europe and the Americas. The company was backed by investment from Columbia Capital in 2020, supporting its continued expansion.
Its work spans product development, platform engineering, and data-driven solutions, supporting clients in building and scaling digital services.
Norbrook
Norbrook Laboratories is a family-owned veterinary pharmaceutical company founded in 1969 and headquartered in Newry, Northern Ireland. The company develops and manufactures veterinary medicines for livestock and companion animals, including antibiotics and anti-inflammatory products used in cattle, horses, swine and pets. Norbrook supplies veterinary pharmaceuticals to more than 100 countries worldwide and maintains a broad portfolio of licensed products.
The company continues to operate as a privately owned business with a focus on expanding its product range in both production animal and companion animal healthcare markets.
NTR plc
NTR plc is an Irish infrastructure investment and asset management company with long-standing experience in renewable energy and infrastructure investment.
The company has invested in and developed wind and solar energy projects across Europe and the United States, with a portfolio that has included several gigawatts of wind capacity and several hundred megawatts of solar capacity through associated investments.
Since 2015, NTR has focused on managing renewable energy investments on behalf of third-party investors through dedicated funds, concentrating on the acquisition and management of operating renewable energy assets.
OHM Group
OHM Group is an Irish private company established in 1972. The group is involved in the importation, distribution and retail of motor vehicles and industrial equipment in Ireland.
Its activities include the distribution of passenger cars, commercial vehicles, buses, materials handling equipment and power generation products. Through its Spirit Motor Group business, OHM Group also operates motor retail dealerships across Ireland.
The group operates from multiple locations in Dublin and Cork and provides services to a broad range of commercial, industrial and private customers.
Openet
Openet was a software provider for communications service providers, founded in 1999 in Dublin, Ireland by Joe Hogan and Declan Conway. The company specialised in business support systems (BSS) for telecommunications operators, focusing on real-time charging, policy management and network monetisation solutions.
In 2020, Openet was acquired by Amdocs and its technologies were integrated into Amdocs’ broader communications software portfolio. Openet’s solutions have been used by major global telecommunications operators to support network transformation, including the transition to 4G and 5G services.
Origin Enterprises
Origin Enterprises plc is an international agronomy and agri-services group providing agronomic advice, crop inputs and digital solutions to the agricultural sector. The company supports farmers and land managers across agriculture, amenity, landscaping and environmental services.
Origin operates across multiple international markets, including Ireland, the United Kingdom, Poland, Romania, Ukraine and Brazil. The group is listed on Euronext Growth (Dublin) and AIM (London), and focuses on delivering agronomy services and inputs supported by data, research and field-based expertise.
