| 113 Strand Road Apartments Ltd | Households | 2019 |
| 16 Lansdowne Crescent Management Company Limited | Households | 2005 |
| 247 PM Ltd | Construction | 2023 |
| 247BNB Ireland Limited | Real estate | 2018 |
| 247ME Ltd | Construction | 2017 |
| 3LW Group Ltd | Financial services | 2024 |
| 3PS Computer Services Limited | Information & communication | 2014 |
| 54 Castleton Ltd | Households | 2024 |
| 56 Eglinton Management Company Ltd | Households | 2017 |
| 5CF Ltd | Hospitality | 2020 |
| 888 Distribution Ltd | Wholesale & retail | 2023 |
| A H Motors (Limavady) Limited | Wholesale & retail | 2018 |
| A Watson Plastering Ltd | Construction | 2019 |
| A3 Hire Ltd | Administrative & support | 2025 |
| Abbington Management Company Limited | Households | 2011 |
| Ace Recycling (NI) Ltd | Water & waste | 2014 |
| Adminops Limited | Administrative & support | 2025 |
| Adonis Fitness Limited | Arts & recreation | 2015 |
| ADR Demolition Ltd | Construction | 2019 |
| Africology PTY Ltd | Financial services | 2016 |
| Aghanloo Community Association | Other services | 2014 |
| Agivey Court Management Services Limited | Households | 2006 |
| AI Woodwork Ltd | Construction | 2022 |
| AJN Commercial Property Limited | Real estate | 2021 |
| AJN Family Holdings Limited | Financial services | 2021 |
| AJN Residential Property Limited | Real estate | 2021 |
| AK Property Management (Ireland) Ltd | Real estate | 2008 |
| AKM Property & Investments Ltd | Real estate | 2020 |
| Alaris Aesthetics Ltd | Extraterritorial | 2025 |
| Alvarod Limited | Wholesale & retail | 1946 |
| Amburke Limited | Real estate | 2023 |
| Andrew Riley Limited | Administrative & support | 2021 |
| Annadale Avenue Property Management Limited | Households | 2021 |
| Annadale Court Management Company Limited | Households | 2007 |
| Anyway Holdings Limited | Financial services | 2022 |
| AR Lean Solutions Ltd | Professional & scientific | 2025 |
| Arches (Dungiven) 2022 Management Company Limited | Households | 2023 |
| ARD Contracts Holding Limited | Financial services | 2023 |
| ARD Contracts Ltd | Construction | 2016 |
| Arden Road Management Company Limited | Households | 2005 |
| Ardgrange Close Management Company Limited | Households | 2016 |
| Arhgfs Ltd | Professional & scientific | 2020 |
| Armco Interiors Limited | Wholesale & retail | 2020 |
| Artabyss Limited | Arts & recreation | 2020 |
| Ashbrook Court Management Company Ltd | Households | 2018 |
| Ashland Ecommerce Limited | Manufacturing | 2016 |
| Ashthorpe Management Company Limited | Households | 2002 |
| Ashview Court Management Limited | Households | 2005 |
| ASK C Consultancy Limited | Financial services | 2012 |
| Assistance Dogs (Adni) | Education | 2021 |
| Atlantic Road Management Company (NO 2) Limited | Households | 2013 |
| ATV Solutions IE Ltd | Wholesale & retail | 2015 |
| Australia Property Ltd | Real estate | 2012 |
| Axis Bioservices Limited | Professional & scientific | 2012 |
| B & E Hone Construction (UK) Ltd | Construction | 2014 |
| B C Auto Sales Ltd | Wholesale & retail | 2016 |
| B D Wise Limited | Real estate | 2023 |
| B Mullan Motors Limited | Wholesale & retail | 2022 |
| Ballymultimber Cottages Limited | Real estate | 2020 |
| Ballynahery Farm Limited | Agriculture & fishing | 2023 |
| Ballynorthland Manor Management Company Limited | Households | 2019 |
| Bamboo Stakes Limited | Financial services | 2023 |
| BAN Developments Ltd | Construction | 2020 |
| Bandrsolutions Limited | Health & social care | 2008 |
| Bangor Eyecare Ltd | Wholesale & retail | 2025 |
| Bann River Cruises Ltd | Transport & logistics | 2020 |
| Bannfield (Ballymoney) Management Company Limited | Households | 2009 |
| Barleyfields (Culmore) Management Company Limited | Households | 2017 |
| Barleyhill Management Company Limited | Households | 2016 |
| Barnn Ltd | Agriculture & fishing | 2021 |
| Baronscourt Property Management (N.I.) Limited | Households | 2020 |
| Barr Design Ltd | Professional & scientific | 2018 |
| Barrcap Ltd | Construction | 2026 |
| Barrett Bros. Builders Ltd | Construction | 2016 |
| BBS Properties & Holdings Ltd | Real estate | 2019 |
| BCM Security Associates Ltd | Administrative & support | 2015 |
| Beech Hill View Management Company Ltd | Households | 2019 |
| Beech Hill View NO.2 Management Company Ltd | Households | 2023 |
| Begley Builders Ltd | Construction | 2013 |
| Belfray Property Ltd | Other services | 2017 |
| Belhaven Properties Limited | Real estate | 2002 |
| Bellarena Fuels Ltd | Wholesale & retail | 2005 |
| Bellarena Links Luxury Lodges Ltd | Hospitality | 2025 |
| Belle Assets Limited | Real estate | 2016 |
| Bellevue Avenue Management Ltd | Households | 2008 |
| Benevenagh Properties Limited | Real estate | 2014 |
| Benview Manor Management Company Limited | Households | 2020 |
| Best Dressed Kids Limited | Wholesale & retail | 2020 |
| BIA Idirnaisiunta Limited | Hospitality | 2018 |
| Big Blue Cargo Ltd | Construction | 2018 |
| BIM Dynamics Ltd | Construction | 2025 |
| Birch Hill Management Company Limited | Households | 2017 |
| BKM Electrical Ltd | Construction | 2026 |
| Black Ridge Hill Management Company Ltd | Households | 2025 |
| Blackdog U.K. Limited | Professional & scientific | 2018 |
| Blackwood Lane Management Company Limited | Households | 2013 |
| Blackwood Management Company (Culmore) Limited | Households | 2011 |
| Bmccic Ltd | Real estate | 2025 |
| BOB Mullan Motors Limited | Wholesale & retail | 1999 |
| Bobbie's Ltd | Manufacturing | 2012 |