| (N.I) Australian Labradoodles Ltd | Agriculture & fishing | 2024 |
| 360 Events Ltd | Administrative & support | 2022 |
| 42 KM Limited | Financial services | 2018 |
| 4TIFY Security Consultant Ltd | Administrative & support | 2024 |
| 5 Star Equine Sales Ltd | Wholesale & retail | 2025 |
| 89 Eglinton Street Management Limited | Households | 2022 |
| A Liminal Space Ltd | Education | 2014 |
| A Smart Move Ltd | Transport & logistics | 2024 |
| A.Knox Consulting Ltd | Professional & scientific | 2026 |
| A1 Coachworks Ltd | Manufacturing | 2000 |
| A1 Taillifts Ltd | Manufacturing | 2000 |
| Abercorn Finance Ltd | Professional & scientific | 2024 |
| Abetta Properties Ltd | Real estate | 2016 |
| Abode Trading Ltd | Wholesale & retail | 2016 |
| Acreback Road Energy Limited | Energy | 2025 |
| ACS Venture Group Ltd | Financial services | 2025 |
| Adje Properties Limited | Real estate | 2023 |
| Affidea NI Limited | Health & social care | 2023 |
| Alan Hines Refrigeration Ltd. | Manufacturing | 2015 |
| Alan Reid Financial Services (NI) Limited | Financial services | 2004 |
| Alana Creations Ltd | Wholesale & retail | 2014 |
| Alanbrooke Developments Ltd | Real estate | 2014 |
| Alexander John Holdings Limited | Real estate | 2022 |
| Alexomas Properties Limited | Real estate | 2026 |
| ALI Currie Interiors Limited | Real estate | 2016 |
| ALL About Birth CIC | Education | 2024 |
| Alpha Holdings (N.I.) Limited | Financial services | 2019 |
| Amcc PM Ltd | Construction | 2026 |
| Aprillo Developments Limited | Real estate | 2006 |
| Arclyte Ltd | Professional & scientific | 2025 |
| ARF Electrical Ltd | Construction | 2019 |
| Armstrong Taylor Limited | Construction | 1999 |
| Articulate Language Services Ltd | Professional & scientific | 2024 |
| Artifinney Farms Limited | Agriculture & fishing | 2023 |
| Ashia & Co Ltd | Hospitality | 2025 |
| Athol Thomson Sports Podiatry Limited | Health & social care | 2023 |
| Attitude Fitness Limited | Arts & recreation | 2026 |
| Avodah Renewable Energies Ltd | Energy | 2013 |
| Away Fulfilment Limited | Transport & logistics | 2026 |
| B & R Annett Limited | Construction | 2018 |
| Bake & BAG Ltd | Manufacturing | 2023 |
| Ballyclare Developments Limited | Real estate | 2015 |
| Ballygowan Consultant Services Ltd | Other services | 2026 |
| Ballynahinch & District Motor Club Limited | Arts & recreation | 1996 |
| Ballyward Enterprises Ltd | Hospitality | 2024 |
| BD Subco Limited | Construction | 2024 |
| BDS Contracts (N.I.) Ltd | Construction | 2013 |
| BDS Property (N.I.) Ltd | Real estate | 2013 |
| Beechhill Property Ltd | Real estate | 2021 |
| Beefalo Limited | Hospitality | 2015 |
| Beesmartmedia Ltd | Professional & scientific | 2019 |
| Belfast Civic Trust Limited | Other services | 2010 |
| Belfast Storm Ltd | Arts & recreation | 2016 |
| Bell S L Ltd | Real estate | 2026 |
| Belmore Trust Limited | Other services | 1983 |
| Belvoir Park LLP | | 2014 |
| Benia Foods Limited | Wholesale & retail | 2016 |
| Beulah Digital Ltd | Professional & scientific | 2019 |
| Big SYD Limited | Real estate | 2014 |
| Bills Pro Sports Ltd | Wholesale & retail | 2025 |
| Bishops Fish and Chips Limited | Hospitality | 2021 |
| Black-Bridge Property Developments Ltd | Real estate | 2025 |
| Black-Bridge Property Ltd | Real estate | 2025 |
| Blackberry Lane Management Company Limited | Households | 2004 |
| Blacklight Arts Ltd | Arts & recreation | 2021 |
| Blackward Properties Limited | Agriculture & fishing | 2000 |
| Blane's Court Management Limited | Extraterritorial | 2024 |
| BLARIS-42 Limited | Real estate | 2026 |
| Blitz CS Solutions Ltd | Professional & scientific | 2026 |
| Blue Gate Gardening Limited | Administrative & support | 2005 |
| Blue Harbour Properties Limited | Real estate | 2026 |
| BOB Mccullagh Business Services Ltd | Professional & scientific | 2010 |
| Book a Time Ltd | Administrative & support | 2019 |
| Boven Professional Resourcing Ltd | Administrative & support | 2022 |
| Boven Safety Management Ltd | Health & social care | 2016 |
| Boyd Developments Limited | Construction | 2020 |
| Boyd Estates Limited | Construction | 2011 |
| Brackenridge Properties (NI) Limited | Construction | 2014 |
| Brammer Ltd | Information & communication | 2024 |
| Breezemount UK Limited | Transport & logistics | 2008 |
| Brolly Properties Limited | Administrative & support | 2017 |
| Bryans Consulting Limited | Information & communication | 2024 |
| Burn Hydro Limited | Energy | 2015 |
| C & C Holdings (NI) Limited | Administrative & support | 1988 |
| C & C Profit Sharing Trustee (NI) Limited | Professional & scientific | 1969 |
| C S I (Ireland) Ltd | Information & communication | 1997 |
| C&H Plumbing & Heating (2020) Ltd | Water & waste | 2020 |
| C-42 Ltd | Real estate | 2025 |
| Camrac Limited | Extraterritorial | 2010 |
| Capstone Homes (N.I.) Ltd | Construction | 2015 |
| Carnreagh Consulting Limited | Professional & scientific | 2016 |
| Carnreagh Property Limited | Real estate | 2023 |
| Carran House Limited | Extraterritorial | 2020 |
| Cas-Kart Ltd | Administrative & support | 2020 |
| Castle Terrace (Hillsborough) Management Company Limited | Households | 2016 |
| Castlebay Trading Ltd | Wholesale & retail | 2025 |
| Causeway Technology Ltd | Information & communication | 2026 |
| Chips Direct Limited | Hospitality | 2020 |
| Church View Residents Hillsborough Ltd | Households | 2025 |
| Ciara Marie Limited | Professional & scientific | 2014 |