| 2020 (NI) Limited | Real estate | 2013 |
| 23TEN Productions Ltd | Information & communication | 2015 |
| 23X Films Ltd | Information & communication | 2025 |
| 2K16 Designs Ltd | Professional & scientific | 2016 |
| 3C Refrigeration Limited | Manufacturing | 2015 |
| 3SIXTY Construction Limited | Construction | 2016 |
| 424 and 1 Ltd | Real estate | 2024 |
| 424AND1 Management Ltd | Real estate | 2023 |
| 424AND2 Ltd | Real estate | 2023 |
| 4INSTA Care Ltd | Health & social care | 2024 |
| 67 Management Ltd | Arts & recreation | 2019 |
| 67 Records Ltd | Information & communication | 2017 |
| A & a Seafood Ltd | Wholesale & retail | 2016 |
| A J Entertainment Limited | Hospitality | 2014 |
| A Moment in Time Photo Booths Ltd | Professional & scientific | 2025 |
| A Russell Properties Ltd | Health & social care | 2022 |
| AAT Group Limited | Professional & scientific | 2020 |
| AAT Holdings Limited | Financial services | 2019 |
| Abbeyview Renewables Limited | Construction | 2011 |
| Ability Works International Ltd | Administrative & support | 2025 |
| Access Video Projects Ltd | Construction | 2003 |
| Adam Dickson Limited | Professional & scientific | 2014 |
| Additive Designing Ltd | Professional & scientific | 2017 |
| Advantage Control N Ireland Ltd | Administrative & support | 2010 |
| Aeeoc Ltd | Construction | 2026 |
| Aegir Ltd | Information & communication | 2021 |
| AF Mechanical Ltd | Construction | 2021 |
| AG Financial Foresight Limited | Extraterritorial | 2006 |
| Airtightness Ireland Ltd | Construction | 2009 |
| AJC Electrical Retail Limited | Wholesale & retail | 2022 |
| AJC Illuminations Limited | Construction | 2022 |
| Ajcg Limited | Construction | 2018 |
| ALL Lives ARE Precious Ltd | Education | 2017 |
| Alpha Performance (N.I.) Ltd | Arts & recreation | 2018 |
| Altair Studios Ltd. | Professional & scientific | 2016 |
| Alufab Products Ltd | Manufacturing | 2020 |
| Ambo Holdings Ltd | Financial services | 2021 |
| AN Cuan Limited | Construction | 2022 |
| Anatoe Ltd | Wholesale & retail | 2025 |
| Andrea Reid & Co Limited | Professional & scientific | 2020 |
| Annacloy Solid Fuels Limited | Wholesale & retail | 2012 |
| Annette's Lets Ltd | Other services | 2021 |
| Antigenesis Biologics Ltd | Professional & scientific | 2024 |
| AON Retail Ltd | Wholesale & retail | 2023 |
| Apex Bricklaying Ltd | Construction | 2019 |
| Apex Property Developments Ltd | Construction | 2023 |
| ARD CM Limited | Professional & scientific | 2013 |
| Ardeen Construction Limited | Construction | 2014 |
| Ardfield Consulting Ltd | Professional & scientific | 2013 |
| Ardglass Development Association CP Ltd. | Education | 2014 |
| Ardglass Harbour Developments | Real estate | 2017 |
| Ardglass Sea Products Limited | Hospitality | 1986 |
| Ardglass Shellfish Suppliers Limited | Wholesale & retail | 2011 |
| Ardigon Limited | Information & communication | 2019 |
| Armau Ltd | Real estate | 2019 |
| Art of Stone Ireland Ltd | Construction | 2022 |
| Ascendance Gymnastics Ltd | Arts & recreation | 2017 |
| ASE Property Investments Ltd | Real estate | 2025 |
| Aspect Digital Designs Ltd | Professional & scientific | 2013 |
| Assumption School Trust | Professional & scientific | 2019 |
| Atelier Peake Ltd | Arts & recreation | 2016 |
| Athas Wholesalers Limited | Wholesale & retail | 2017 |
| Athena Blue Innovation Ltd | Professional & scientific | 2023 |
| Athlos Triathlon Limited | Wholesale & retail | 2015 |
| Audleystown Properties Limited | Construction | 2010 |
| Auto Door Ireland Ltd | Construction | 2024 |
| Autozone Carparts Ltd | Wholesale & retail | 2007 |
| Avtal Consultancy Limited | Professional & scientific | 2024 |
| Axethra Coaching Limited | Education | 2025 |
| Axiom Biolabs Ltd | Professional & scientific | 2026 |
| Ayecode Ltd | Information & communication | 2015 |
| B Crawford Limited | Administrative & support | 2011 |
| B TAN Ltd | Other services | 2025 |
| B.C. Cars Ltd | Wholesale & retail | 1998 |
| B.J. Wills Limited | Agriculture & fishing | 2012 |
| Balah Limited | Manufacturing | 2013 |
| Ballydugan Medieval Settlement Ltd | Education | 2021 |
| Ballyhornan and District Community Association | Arts & recreation | 2005 |
| Ballyhornan Property 1 Limited | Construction | 2024 |
| Ballyhornan Property 2 Limited | Construction | 2024 |
| Ballyhornan Property 3 Limited | Construction | 2024 |
| Ballyhossett Properties Limited | Real estate | 2015 |
| Ballymote Pharmacy Limited | Wholesale & retail | 2014 |
| Ballynagross Rural Community Hub | Arts & recreation | 2014 |
| Ballysugagh Limited | Hospitality | 2018 |
| Ballyvaston Aviation Services Ltd | Manufacturing | 2022 |
| Barnaby's Nursery Ltd | Health & social care | 2007 |
| Baroc Property Ltd | Real estate | 2023 |
| BCG Properties Limited | Real estate | 2015 |
| BCR Construction Ltd | Construction | 2022 |
| Beeps Sweet Treats Ltd | Wholesale & retail | 2026 |
| Beijing Mercantile Exchange Limited | Information & communication | 2023 |
| Beldon Investments Ltd | Real estate | 2020 |
| Belfast Personal Trainer Limited | Other services | 2019 |
| Belfast XR Festival Limited | Information & communication | 2022 |
| Bell Investments (Crossgar) Ltd | Real estate | 2012 |
| Bells of Crossgar Accident Repair Centre Limited | Wholesale & retail | 2015 |
| Bells of Crossgar Limited | Wholesale & retail | 2015 |
| Benchmarc Group Ltd | Professional & scientific | 2023 |
| Benderg Properties Ltd | Professional & scientific | 2024 |