| 0401 Limited | Real estate | 2021 |
| 0679 Limited | Professional & scientific | 2025 |
| 15CR Properties Limited | Real estate | 2018 |
| 19.8 Limited | Real estate | 2025 |
| 22 Bricks Limited | Hospitality | 2020 |
| 22TAPS Ltd | Hospitality | 2023 |
| 2306 Limited | Professional & scientific | 2025 |
| 3 6 and 9 Holdings Limited | Real estate | 2025 |
| 3D Commercials Limited | Wholesale & retail | 2021 |
| 49 Sydney Street Limited | Households | 2010 |
| 4R Future Holdings Limited | Administrative & support | 2022 |
| 5 Olives Limited | Real estate | 2025 |
| 50/50 Architectural Services Limited | Professional & scientific | 2008 |
| 53MARKETING Limited | Information & communication | 2023 |
| 5SCORE Ltd | Wholesale & retail | 2022 |
| 64-66 Spencer Road Management Company Ltd | Households | 2022 |
| 7 Strand Road Limited | Construction | 2018 |
| 7070 Property Holdings Ltd | Financial services | 2022 |
| 7I Architects Ltd | Professional & scientific | 2023 |
| 8668 Ltd | Hospitality | 2018 |
| 8H Limited | Real estate | 2002 |
| 8H Solutions Limited | Professional & scientific | 2005 |
| 95/97 Spencer Road Management Company Limited | Households | 2003 |
| 999 Competitions Limited | Arts & recreation | 2025 |
| A & M Coaches (NI) Limited | Transport & logistics | 2023 |
| A a Miller & SON Ltd | Construction | 2005 |
| A Aesthetics North Coast Limited | Health & social care | 2023 |
| A Aesthetics Training Academy Limited | Health & social care | 2023 |
| A Daly Ltd | Construction | 2003 |
| A J Norrby 2 Limited | Hospitality | 2024 |
| A J Norrby Ltd | Hospitality | 2018 |
| A M Donnell Limited | Real estate | 2023 |
| A&A Foods Limited | Hospitality | 2025 |
| A&R Power Limited | Energy | 2013 |
| A-Star Brickwork Ltd | Construction | 2024 |
| A. Doherty Plant Hire Limited | Administrative & support | 2023 |
| A.D. Canning Joinery Ltd | Manufacturing | 2011 |
| A.E. Mccandless (Shirt Makers) Limited | Financial services | 2000 |
| A.M.K Wind Ltd | Construction | 2025 |
| A1 Coach Travel Ltd | Transport & logistics | 2003 |
| A1 Construction Plant & Machinery Training Centre Limited | Construction | 2015 |
| A1 Fire Stop Ltd | Wholesale & retail | 2018 |
| AAS Bhjk Ltd | Wholesale & retail | 2024 |
| AB Motors (NI) Limited | Wholesale & retail | 2012 |
| AB Paul Ltd | Professional & scientific | 2024 |
| AB48 Ltd | Hospitality | 2024 |
| Abercorn Developments & Leisure (1990) Limited | Households | 1990 |
| Aberderry Limited | Manufacturing | 2019 |
| Aberfoyle Band B Ltd | Households | 2020 |
| Ablina Limited | Financial services | 2023 |
| AC Property Direct Ltd | Real estate | 2025 |
| Acam (Derry) Ltd | Hospitality | 2019 |
| Ace Home Centre Limited | Wholesale & retail | 2000 |
| ACL Ireland Ltd | Manufacturing | 2022 |
| ACR Energy Solutions Limited | Construction | 2012 |
| ACS Controls Ltd | Manufacturing | 2014 |
| Actionsense Ltd. | Professional & scientific | 2012 |
| Adairs Waterside Ltd | Wholesale & retail | 1999 |
| Admac (NI) Limited | Manufacturing | 2004 |
| Adminanswers NI Ltd | Administrative & support | 2020 |
| Adms Limited | Professional & scientific | 2005 |
| Adria Hosiery Limited | Manufacturing | 2024 |
| ADS Atom Ltd | Information & communication | 2025 |
| Advie Eaja Ltd | Wholesale & retail | 2024 |
| AE Contracts Ltd | Construction | 2024 |
| Aecc Project Consultancy Ltd | Professional & scientific | 2020 |
| Aeroblue Software Limited | Information & communication | 2017 |
| Aerofixtures Solutions Limited | Professional & scientific | 2020 |
| AFD Investments NI Ltd | Real estate | 2024 |
| Affinity for YOU Ltd | Extraterritorial | 2020 |
| Agdtyid Zjede Ltd | Wholesale & retail | 2024 |
| AGH Productions Ltd | Arts & recreation | 2017 |
| AGI Engineering UK Limited | Construction | 2025 |
| Agile Insurtech Partners Ltd | Administrative & support | 2025 |
| AGK Ventures Limited | Real estate | 2025 |
| AGM International Ltd | Wholesale & retail | 2017 |
| AGM Supplies Ltd | Wholesale & retail | 2024 |
| Agora Branding Limited | Information & communication | 2020 |
| Agrii Holdings (UK) Limited | Professional & scientific | 2010 |
| Agslt Facilities Management Ltd | Real estate | 2014 |
| AIC Events Ltd | Administrative & support | 2025 |
| Aiend Dcvh Ltd | Wholesale & retail | 2024 |
| Aileach View 5 Properties Ltd | Households | 2017 |
| Airport Runner Ltd | Extraterritorial | 2025 |
| Aiteall Property Ltd | Real estate | 2023 |
| AJ Haulage & Plant Hire Limited | Manufacturing | 2023 |
| Ajma Bar & Grill Ltd | Hospitality | 2025 |
| AK Solutions N.I. Limited | Information & communication | 2025 |
| Akira Contracts Ltd | Administrative & support | 2021 |
| AL Falah Trading Ltd | Wholesale & retail | 2026 |
| Albert George Bespoke Limited | Manufacturing | 2023 |
| Alberta Investments Ltd | Real estate | 2014 |
| Alchemist Investments Unlimited N.I. | Other services | 2018 |
| Alder Heights Limited | Financial services | 2023 |
| Aletheia Cyber Limited | Information & communication | 2025 |
| Alexander Gourley Ltd | Real estate | 1994 |
| Alfagov Ltd | Information & communication | 2025 |
| Aligned B2B Marketing Ltd | Professional & scientific | 2018 |
| Aligned Sales Company Ltd | Professional & scientific | 2025 |
| ALL Floors F S Ltd | Construction | 2019 |