| 3D Homes Limited | Construction | 2020 |
| A Mckeown & Sons Limited | Wholesale & retail | 2008 |
| A Woods Transport Ltd | Transport & logistics | 2023 |
| AA & KA Holdings Limited | Real estate | 2021 |
| AA Sellers Limited | Wholesale & retail | 2025 |
| Acceleration Properties Limited | Financial services | 2001 |
| Access Automation Services Ltd | Manufacturing | 2023 |
| AGP Catering Limited | Hospitality | 2024 |
| Aldwych Limited | Extraterritorial | 2013 |
| ALL Things Furniture Limited | Manufacturing | 2011 |
| Amanda Barr Limited | Other services | 2025 |
| Ambleside Property Services Ltd | Real estate | 2012 |
| AMJ Accountancy Limited | Professional & scientific | 2013 |
| Amrc Ltd | Agriculture & fishing | 2018 |
| Ancora Church | Other services | 2023 |
| Andco Properties Ltd | Real estate | 2015 |
| Anfield Transport Limited | Transport & logistics | 2007 |
| Annaghmore Machinery Sales Ltd | Wholesale & retail | 2020 |
| Annakeera Horticultural Services Ltd | Agriculture & fishing | 2016 |
| AP Signs Print and Display Limited | Professional & scientific | 2019 |
| Apache Pizza Catering Ltd | Hospitality | 2023 |
| Apex Sports N. I. Ltd | Hospitality | 2026 |
| Arches Investments Ltd | Real estate | 2022 |
| Ardban Belfast Limited | Extraterritorial | 2013 |
| Aretech Ventures Ltd. | Construction | 2021 |
| Arkle Enterprises Ltd | Information & communication | 2005 |
| Armagh Banbridge Craigavon Skip Hire Ltd | Water & waste | 2015 |
| Armagh Distillery Ltd | Manufacturing | 2021 |
| Armagh Self Storage Ltd | Extraterritorial | 2021 |
| Asbestos Waste Disposal Ltd | Construction | 2012 |
| Axoren Ventures Ltd | Wholesale & retail | 2025 |
| B & P Mcmahon Bros Ltd | Construction | 2014 |
| Bakers WEE Buns Ltd | Manufacturing | 2011 |
| Balkan Meal Ltd | Hospitality | 2025 |
| Ballinteggart Events Company Ltd | Administrative & support | 2022 |
| Ballyboe Ltd | Real estate | 2025 |
| Ballymoran Farm Ltd | Agriculture & fishing | 2020 |
| Ballynamoney View Management Co Ltd | Households | 2024 |
| Bann Mobility Limited | Wholesale & retail | 2012 |
| Bassetts (Wolseley) Limited | Wholesale & retail | 2022 |
| Bcmw Holdings Ltd | Professional & scientific | 2014 |
| Belmont Freight Ltd | Professional & scientific | 2022 |
| Bengal Tandoori Indian Limited | Hospitality | 2013 |
| Bernard Properties (Newry) Limited | Construction | 2020 |
| BH Technical Services (Europe) Ltd | Wholesale & retail | 2018 |
| Blacks Competitions Ltd | Arts & recreation | 2026 |
| Blossom Adhd Limited | Health & social care | 2021 |
| Bluestone Holdings (N.I) Ltd | Financial services | 2021 |
| Bluestone Properties (N.I) Ltd | Real estate | 2021 |
| BMS System Solutions (NI) Limited | Professional & scientific | 2023 |
| Boreal Limited | Construction | 1993 |
| Box Developments Ltd | Construction | 2021 |
| Boyce Precision Engineering (Holdings) Ltd | Manufacturing | 2020 |
| Boyle Properties 1 Limited | Real estate | 2022 |
| Brae Enterprises Ltd | Health & social care | 2024 |
| Breagh Recruitment Ltd | Administrative & support | 2019 |
| Breagh View Properties Ltd | Real estate | 2018 |
| Bridge Counselling Craigavon CIC | Health & social care | 2021 |
| BSG Catering Limited | Hospitality | 2024 |
| Build Ready Kernan Ltd | Construction | 2023 |
| Burkes of Cornascriebe Limited | Extraterritorial | 1999 |
| Burr Timber Ltd | Manufacturing | 2023 |
| Business Contact Solutions Limited | Administrative & support | 2011 |
| C&Js Animal Park Ltd | Arts & recreation | 2016 |
| C&P Motors Ltd | Wholesale & retail | 2021 |
| C.C. & D. Properties Ltd | Construction | 2001 |
| Cado Limited | Extraterritorial | 1995 |
| Cafe Zulu Limited | Hospitality | 2023 |
| Calvert Developments Ltd | Construction | 2020 |
| Cameron Contracts Ireland Limited | Water & waste | 2014 |
| Carleton Chambers 2023 Limited | Financial services | 2012 |
| Carn Court Property Limited | Professional & scientific | 2014 |
| Carnmore Properties Ltd | Construction | 2018 |
| Cecil a. Haffey & SON Limited | Manufacturing | 2007 |
| Charlestown Retail Ltd | Wholesale & retail | 2021 |
| Cheb Limited | Wholesale & retail | 2022 |
| Chenross | Professional & scientific | 2022 |
| Chiron Medical Innovations Ltd | Professional & scientific | 2025 |
| Chris Boyle Holdings Limited | Real estate | 2023 |
| Cido (Management) Limited | Information & communication | 1987 |
| CJS Equipment Ltd | Wholesale & retail | 2025 |
| Clearpath SEO Ltd | Professional & scientific | 2026 |
| Clendinning Management Limited | Real estate | 2009 |
| Clive Richardson (International) Limited | Professional & scientific | 2003 |
| Clive Richardson Limited | Administrative & support | 1977 |
| Comiskey Engineering Limited | Wholesale & retail | 2020 |
| Connect Housing Group Limited | Construction | 2020 |
| Construction LMS Training Ltd | Education | 2011 |
| Convenient Car Parks Limited | Administrative & support | 1995 |
| Corcrain Shop Ltd | Wholesale & retail | 2023 |
| Cornerstone Rentals Ltd | Real estate | 2021 |
| County Armagh Vintage Vehicle Club Limited | Arts & recreation | 1987 |
| COX Contracts Ltd | Construction | 2007 |
| CR Holdings N.I Ltd | Financial services | 2025 |
| Craigavon Industrial Development Organisation | Information & communication | 1984 |
| Craigavon Plastics Limited | Manufacturing | 1979 |
| Craigmore Belfast Ltd | Wholesale & retail | 2017 |
| Craigmore Property Ltd | Construction | 2021 |
| Craigmoreonline Ltd | Wholesale & retail | 2016 |
| Cranvale Capital Limited | Real estate | 2020 |