| (NI) the Roofing Outlaw Supplies Ltd | Wholesale & retail | 2026 |
| 1 Stop Medical Supplies Ltd | Manufacturing | 2021 |
| 1-4-U Financial Solutions Ltd | Financial services | 2011 |
| 1-7 Avenue Ltd | Households | 2025 |
| 1-7 Bryansglen Ltd | Extraterritorial | 2025 |
| 104-110 Ltd | Households | 2025 |
| 108 Recruitment Ltd | Wholesale & retail | 2024 |
| 13CREGAGH Limited | Wholesale & retail | 2025 |
| 15 Ogwen Terrace Limited | Real estate | 2010 |
| 16-22 Park Ltd | Extraterritorial | 2025 |
| 162 Seacliff Road Management Company Limited | Households | 2017 |
| 18 Elms Road Management Ltd | Real estate | 2020 |
| 1816 Cycles Ltd | Manufacturing | 2018 |
| 189 Clifton Park Avenue Limited | Extraterritorial | 2008 |
| 19 Events Ltd | Hospitality | 2023 |
| 192 Seacliff Road Management Company Limited | Households | 2021 |
| 1ST Klass Fire Protection Engineers (Bangor) Ltd | Public administration | 2004 |
| 23-29 Grange Ltd | Households | 2026 |
| 24-30 Park Ltd | Households | 2025 |
| 24SEVEN FM Services Limited | Administrative & support | 2025 |
| 262 Bangor Road Management Company Ltd | Extraterritorial | 2006 |
| 29 Event Catering Ltd | Hospitality | 2015 |
| 2JZGTE Ltd | Wholesale & retail | 2026 |
| 3 Crown Ltd | Real estate | 2020 |
| 3 Nisecurity Ltd | Administrative & support | 2022 |
| 3-SAINTS Energy Ltd | Professional & scientific | 2019 |
| 30 Maxman Limited | Households | 2017 |
| 3182 Bingham Ltd | Other services | 2021 |
| 3182 Franklin Ltd | Other services | 2022 |
| 37 Abbey Road Llandudno Management Company Limited | Real estate | 2021 |
| 3MT Limited | Professional & scientific | 2020 |
| 3TIER (NI) Ltd | Hospitality | 2016 |
| 4180 Enterprises Limited | Wholesale & retail | 2024 |
| 4JAMZ Ltd | Construction | 2013 |
| 6-12 Grange Ltd | Households | 2026 |
| 62 Belfast Road Management Company Ltd | Households | 2006 |
| 63 Dufferin Avenue Property Management Limited | Real estate | 2016 |
| 75POINT3@WILLIAMSDENTON Ltd | Financial services | 2002 |
| 8-14 Park Ltd | Households | 2025 |
| 9296 Avenue Limited | Households | 2023 |
| @ 109 Bangor CYF | Hospitality | 2023 |
| A & D Hotsaw Ltd | Education | 2015 |
| A & R Self Storage Ltd | Transport & logistics | 2025 |
| A Peculiar Tea Ltd | Hospitality | 2025 |
| A Star Cargo Services Limited | Transport & logistics | 2025 |
| A&L Creative Ltd | Manufacturing | 2021 |
| A&T Marine Ltd | Other services | 2017 |
| A-Star Mobile Fone Limited | Wholesale & retail | 2019 |
| A.H. Ward & Boyd Limited, | Wholesale & retail | 1963 |
| A5AV Ltd | Information & communication | 2020 |
| Aadmar Construction Ltd | Construction | 2022 |
| Aadmar Limited | Construction | 2021 |
| Abaana Ministries | Other services | 1998 |
| ABD Properties Limited | Real estate | 2004 |
| Abeni Ltd | Professional & scientific | 2003 |
| Above Limits Stunt Academy Ltd | Arts & recreation | 2021 |
| Above the Brine Ltd | Manufacturing | 2020 |
| ABS Accountants ( Bangor ) Ltd | Professional & scientific | 2013 |
| ABS Accountants Ltd | Professional & scientific | 2010 |
| Absalyon Limited | Construction | 2005 |
| Absolute Face & Body Limited | Administrative & support | 2017 |
| Absolute Glamour Formals Limited | Wholesale & retail | 2016 |
| Acai Marketing Ltd | Administrative & support | 2012 |
| Access Wellbeing C.I.C. | Health & social care | 2012 |
| Accountancy and Business Support Limited | Professional & scientific | 2004 |
| Ace Tech Limited | Wholesale & retail | 2023 |
| Achnashean Fencing Limited | Construction | 1999 |
| Achnashean Holdings Limited | Professional & scientific | 1999 |
| Active Wellness Limited | Health & social care | 2018 |
| Adamson Rice Law NI Limited | Professional & scientific | 2024 |
| Addicted Promotions Limited | Arts & recreation | 2025 |
| Adept Tooling Limited | Manufacturing | 2003 |
| Adiungo Ltd | Information & communication | 2003 |
| ADO Restaurant Ltd | Hospitality | 2024 |
| Adrian Hall Chartered Accountants Limited | Professional & scientific | 2016 |
| Adullam Enterprises Limited | Hospitality | 2013 |
| Advance Business Ltd | Administrative & support | 2023 |
| Advanced Vacuum & Lift Limited | Professional & scientific | 2025 |
| Advancedni Ltd | Construction | 2025 |
| Advent Supplies Ltd | Hospitality | 2000 |
| AEJ Construction Services Ltd | Professional & scientific | 2019 |
| AEJ Developments Ltd | Construction | 2021 |
| Aemc Limited | Administrative & support | 2021 |
| Afap Consultancy Limited | Information & communication | 2014 |
| Affinity (NI) Limited | Hospitality | 2011 |
| Afon Pathways Ltd | Health & social care | 2026 |
| Afro Creation Associates Limited | Arts & recreation | 2020 |
| AG Derwen Limited | Professional & scientific | 2021 |
| AGB Bangor BID | Other services | 2015 |
| AGE North Down & Ards | Health & social care | 1999 |
| Agile Communications Ltd | Professional & scientific | 2021 |
| Agored Cymru | Education | 2004 |
| Agoriad Cyfyngedig | Other services | 1992 |
| Agoriad Trading CYF | Administrative & support | 2011 |
| Agoriad Training Cyfyngedig | Other services | 1995 |
| Agri-Web Limited | Manufacturing | 2000 |
| AGS Medical Ltd | Health & social care | 2015 |
| AGT Engineering Limited | Professional & scientific | 2026 |
| AH Training Solutions Limited | Administrative & support | 2021 |
| AH2 Bangor Limited | Construction | 2019 |