| 146 Trading Limited | Administrative & support | 2025 |
| 155 Bloomfield Avenue Ltd | Households | 2023 |
| 2000WEEKS.COM Limited | Professional & scientific | 2017 |
| 23 Design Limited | Professional & scientific | 2013 |
| 2ND Part Productions Ltd | Information & communication | 2021 |
| 3030 Ltd | Wholesale & retail | 2016 |
| 35 Donegall Place Limited | Real estate | 2022 |
| 3EN Cloud Ltd | Professional & scientific | 2011 |
| 3EN Group Limited | Professional & scientific | 2019 |
| 46A Productions Ltd | Information & communication | 2025 |
| 4X Trading NI Limited | Financial services | 2024 |
| 55N Consulting Limited | Professional & scientific | 2013 |
| 6XHUNDRED Limited | Hospitality | 2019 |
| 73 South Beach Hotel Limited | Hospitality | 2018 |
| A.A Consultation Limited | Extraterritorial | 2015 |
| Abbey Road Mews Limited | Households | 2002 |
| Abdelhafiz Ltd | Health & social care | 2025 |
| Aberlady Inn Limited | Financial services | 2020 |
| Abernethy and Butler Limited | Hospitality | 2013 |
| Abingdon Fine Wine Ltd | Wholesale & retail | 2023 |
| Accommodate Global Group UK Limited | Professional & scientific | 2025 |
| ACT Support Services Ltd | Education | 2024 |
| Active Health Studio Limited | Health & social care | 2026 |
| Adapt Learning NI Ltd | Education | 2026 |
| Adcroft Amusements Limited | Administrative & support | 2002 |
| Adcroft Developments Limited | Extraterritorial | 2016 |
| Adpni Ltd | Professional & scientific | 2025 |
| Advise HER Limited | Professional & scientific | 2025 |
| Aemg Ltd | Extraterritorial | 2012 |
| Aerogel X Ltd | Construction | 2023 |
| Affordable Valued Solutions Limited | Wholesale & retail | 2020 |
| Agrk Limited | Health & social care | 2024 |
| Ahaw Property Limited | Real estate | 2024 |
| Aids Care Education and Training (Northern Ireland) Limited | Education | 1994 |
| Ak&Hn Holdings Limited | Administrative & support | 2021 |
| Alexandra Park Residents Ltd | Households | 2020 |
| ALL Car Insurance Services (G.B.) Ltd. | Extraterritorial | 1987 |
| ALL Car Insurance Services Limited | Extraterritorial | 1981 |
| Allblue Leisure Limited | Wholesale & retail | 2016 |
| Almcc (NI) Limited | Real estate | 2021 |
| Alpha Communications (Ireland) Limited | Information & communication | 2001 |
| AMAC13 Property Limited | Real estate | 2021 |
| Amai Solutions Ltd | Information & communication | 2025 |
| Ambly Ltd | Real estate | 2022 |
| AMC Building & Contracting Ltd | Construction | 2024 |
| AMC Properties (N.I.) Ltd | Real estate | 2024 |
| Amika Property Developments Limited | Extraterritorial | 2005 |
| Ampm Property Solutions Ltd | Real estate | 2022 |
| Ampm Property Solutions NO. 18 Ltd | Real estate | 2022 |
| Anaesthesia Medical Services Ltd | Extraterritorial | 2013 |
| Andrew Dunlop Homes 2 Ltd | Construction | 2024 |
| Andrew Dunlop Homes 3 Ltd | Construction | 2024 |
| Andrew Dunlop Homes 5 Ltd | Construction | 2025 |
| Andrew Dunlop Homes 6 Ltd | Construction | 2026 |
| Andrew Dunlop Homes 7 Ltd | Construction | 2026 |
| Andrew Graham Sound Limited | Information & communication | 2024 |
| Annett Young Limited | Professional & scientific | 2022 |
| Antrim Construction Co. Limited | Construction | 1966 |
| Apex RJM Ltd | Professional & scientific | 2023 |
| APG Acquisitions Limited | Real estate | 2021 |
| Apsley Street Holdings Limited | Financial services | 2025 |
| Aquila International Services Limited | Financial services | 2006 |
| Archive Creative Limited | Professional & scientific | 2018 |
| Arco Quartet Concerts Ltd | Professional & scientific | 2025 |
| Arco String Quartet Ltd | Arts & recreation | 2026 |
| Ardeskin Properties Limited | Real estate | 2005 |
| Ardmore Advertising & Marketing Limited | Professional & scientific | 1988 |
| Ardmore Court Management Limited | Households | 2009 |
| Ardmore Court Management Number 2 Limited | Households | 2016 |
| Ardmore Media Limited | Professional & scientific | 2019 |
| Ardreigh Holdings Ltd | Administrative & support | 2007 |
| Ardu Solutions Limited | Professional & scientific | 2023 |
| Arrow Systems (NI) Limited | Administrative & support | 2013 |
| Art & Home Ltd | Extraterritorial | 2021 |
| Artistic Abundance Ltd | Construction | 2025 |
| Asap Cargo Holdings Ltd | Financial services | 2023 |
| Ascent 76 Limited | Professional & scientific | 2006 |
| Ashton Brown Ltd | Wholesale & retail | 2025 |
| Aspects Financial Ltd | Financial services | 2008 |
| Aspen Ireland Ltd | Construction | 2013 |
| Assemble Bakery Ltd | Hospitality | 2023 |
| Astral Education Limited | Education | 2021 |
| Atheria Limited | Other services | 2025 |
| Atlantic Barbell Ltd | Wholesale & retail | 2018 |
| Attitude Media Group Ltd | Manufacturing | 2025 |
| Autonemo Ltd | Information & communication | 2018 |
| Babocush Ireland Limited | Wholesale & retail | 2025 |
| Bacar Group Limited | Financial services | 2013 |
| Ballydrum Investments Limited | Real estate | 2015 |
| Ballygood Estates Limited | Professional & scientific | 2019 |
| Ballygrainey Stud Farm Ltd | Agriculture & fishing | 2018 |
| Ballyhack Consortium Limited | Hospitality | 2019 |
| Ballykeel Investments Ltd | Real estate | 2023 |
| Baylands Coffee Company Ltd | Hospitality | 2025 |
| BB Property N.I. Limited | Administrative & support | 2024 |
| BCR Properties Ltd | Real estate | 2020 |
| Bece Limited | Arts & recreation | 2025 |
| Beck Financial Services Limited | Professional & scientific | 2024 |
| Bedford Falls Consulting Ltd | Professional & scientific | 2011 |
| Beechview Leisure Limited | Hospitality | 2013 |