| 15CR Hotels Limited | Hospitality | 2018 |
| 17 Ebrington Square Ltd | Construction | 2023 |
| 2 Clean 4 U (N.I.) Ltd | Administrative & support | 2021 |
| 212 Travel Solutions Limited | Transport & logistics | 2025 |
| 26CR Ltd | Real estate | 2015 |
| 2D Ventilation Services Ltd | Energy | 2021 |
| 2THECITY Ltd | Professional & scientific | 2005 |
| 8 NR Limited | Financial services | 2024 |
| A & N Fuels N.I. Limited | Wholesale & retail | 2005 |
| A K Scaffold Limited | Construction | 2019 |
| A T Joinery & Construction Ltd | Construction | 2022 |
| A. & J. Long Bros. Ltd. | Wholesale & retail | 1998 |
| A.L.Mccay Ltd | Construction | 2024 |
| Aace Holdings Limited | Real estate | 2025 |
| Aall DEV Ltd | Real estate | 2018 |
| Aardech Engineering Ltd | Professional & scientific | 2026 |
| ABC Business Innovation Consultants Ltd | Professional & scientific | 2013 |
| ABC Childminding Limited | Health & social care | 2025 |
| ABC Domestic Services Ltd | Administrative & support | 1999 |
| AC Gaming Technologies Limited | Information & communication | 2021 |
| AC Motors Direct Ltd | Wholesale & retail | 2019 |
| Academy for International Science and Research Ltd | Education | 2015 |
| Academy for Technological Innovation and Research Limited | Information & communication | 2017 |
| Accupoint Systems Limited | Information & communication | 2016 |
| Acdrestaurants Ltd | Hospitality | 2025 |
| Ace Contrax Ltd | Construction | 2023 |
| ACM Interiors Ltd | Construction | 2019 |
| Acorn Biomass Company Ltd | Extraterritorial | 2014 |
| Acton HIP and Knee Consultant Ltd | Health & social care | 2014 |
| Advice Services Skeoge Ltd | Administrative & support | 2021 |
| AES Beauty Limited | Other services | 2022 |
| Agri Wear Ltd | Wholesale & retail | 2020 |
| Aileach Consultancy Ltd | Professional & scientific | 2022 |
| Aileach Geotech Ltd | Professional & scientific | 2021 |
| Aileach Valley Construction Ltd | Construction | 2009 |
| Aiwm Orthopaedics Limited | Health & social care | 2024 |
| Ajam Enterprises Limited | Wholesale & retail | 2020 |
| Alador Ltd | Extraterritorial | 2008 |
| Alex Wray Safety Ltd | Administrative & support | 2023 |
| Alfer Flooring Ltd | Construction | 2024 |
| Allies Creative Studio Ltd | Professional & scientific | 2025 |
| Allpro Construction Limited | Construction | 2019 |
| Allscaff Sales and Hire Ltd | Wholesale & retail | 2023 |
| Alpha Epos Limited | Information & communication | 2017 |
| Alpha Stained Glass Ltd | Construction | 2015 |
| Alternating Solutions Ltd | Professional & scientific | 2024 |
| AMD Fire and Security Ltd | Other services | 2015 |
| AMG Welding Fabrication & Mechanical Services Limited | Construction | 2024 |
| AMP Investments and Management Co Ltd | Real estate | 2024 |
| AMR Cable Jointing Ltd | Construction | 2018 |
| AMS Builders Ltd | Construction | 2017 |
| AN Caladh Health Ltd | Health & social care | 2024 |
| Andronics Communications Ltd | | 1984 |
| Anita Delivery Ltd | Information & communication | 2019 |
| ANY Uniforms & Workwear Ltd | Wholesale & retail | 2021 |
| AOC Contracts (N.I.) Ltd | Construction | 2016 |
| AOC Properties Ltd | Real estate | 2015 |
| AP Sammon Limited | Professional & scientific | 2014 |
| Apache Vape Limited | Wholesale & retail | 2016 |
| Apache Vape Retail Limited | Wholesale & retail | 2017 |
| APK Holdings Limited | Wholesale & retail | 2006 |
| Aras Cholmcille Trust | Arts & recreation | 2003 |
| Arbor Bakery Ltd | Manufacturing | 2021 |
| Arch Medical Limited | Health & social care | 2019 |
| Ardan Solutions Limited | Professional & scientific | 2026 |
| Ardisle Limited | Administrative & support | 2011 |
| Ardisle Properties Limited | Real estate | 2018 |
| ARK Electric Holding Ltd | Financial services | 2026 |
| Art Salvage Ltd | Water & waste | 2019 |
| Ashley Martin (N.I.) Limited | Real estate | 1992 |
| Ashley Martin Shopfitting UK Limited | Manufacturing | 2018 |
| Assured Commercial Services T/A Catertek Ltd | Construction | 2026 |
| Astrelium Ltd | Information & communication | 2024 |
| Atalla Energy Limited | Energy | 2017 |
| Atelier Hair Co Limited | Professional & scientific | 2020 |
| Atlantic Plant & Construction Limited | Construction | 2015 |
| Aughnazoom Limited | Information & communication | 2019 |
| Aurora Developments (Ireland) Ltd | Real estate | 2020 |
| AVA Hotel Ltd | Hospitality | 2022 |
| AVA Takeaway Foods Ltd | Hospitality | 2022 |
| Ayana Bridal Ltd | Wholesale & retail | 2019 |
| Azahar Limited | Wholesale & retail | 2021 |
| B Fast Contract Services Ltd | Transport & logistics | 2025 |
| B Fast Parcels Ltd | Transport & logistics | 2012 |
| B H P Alarms Limited | Administrative & support | 2001 |
| B Secure Alarms Limited | Administrative & support | 2021 |
| B&G Brickworks Ltd | Construction | 2019 |
| Babil Restaurant Ltd | Hospitality | 2025 |
| Badgers Bar & Restaurant Ltd | Hospitality | 2026 |
| Balcar Developments Ltd | Construction | 2023 |
| Ballyboes Holdings Limited | Financial services | 2022 |
| Ballymagroarty - Hazelbank Community Partnership | Other services | 1998 |
| Barnwave Ltd | Real estate | 2021 |
| Baronscourt Europe Limited | Financial services | 2021 |
| Bayswater Place Holdings Ltd | Real estate | 2017 |
| Bayview Properties (NI) Ltd | Construction | 2012 |
| Beacon Broadband Ltd | Information & communication | 2016 |
| Bean in the BAG Limited | Hospitality | 2013 |
| Beechwood Developments Limited | Real estate | 2013 |
| Beechwood Stores Derry Limited | Wholesale & retail | 2019 |