| AMR Roofing Ltd | Construction | 2019 |
| Anak Dagang Logistics Ltd | Transport & logistics | 2020 |
| Anak Dagang Trading Ltd | Wholesale & retail | 2021 |
| Anchor Support Ltd | Administrative & support | 2026 |
| Andersons Homes Ltd | Construction | 2024 |
| Andrew G Bell Financial Solutions Limited | Financial services | 2013 |
| Andy Hinde Ltd | Transport & logistics | 2016 |
| Angel Consultancy (NE) Limited | Real estate | 2021 |
| Angel Fire Limited | Other services | 2012 |
| Angel Property Solutions (NE) Limited | Real estate | 2017 |
| Angel View Electrics Ltd | Construction | 2017 |
| Angels Cestria Limited | Other services | 2008 |
| Anglo Scottish Asset Finance Limited | Wholesale & retail | 2007 |
| ANN & Arthur Adlington Limited | Real estate | 1998 |
| Antonio Scaffolding (NE) Limited | Construction | 2018 |
| Apeak Ltd | Construction | 2024 |
| Apex Strength Ltd | Wholesale & retail | 2025 |
| APJ International Ltd | Transport & logistics | 2026 |
| Arborists N E Ltd | Agriculture & fishing | 2024 |
| ARC Avenue Limited | Real estate | 2021 |
| ARC Healthcare and Education Limited | Health & social care | 2023 |
| Arcadia Learning Limited | Education | 2003 |
| Arcwhiz 2000 Limited | Hospitality | 2000 |
| Arda Stitch Ltd | Other services | 2026 |
| Area Maintenance Ltd | Construction | 2014 |
| Aria M Estates Ltd | Real estate | 2022 |
| ARK Signs (NE) Limited | Professional & scientific | 2023 |
| Arlev CLS Ltd | Hospitality | 2026 |
| Armstrong Nationwide Ltd. | Financial services | 2000 |
| Arrebol Media Ltd. | Information & communication | 2023 |
| Arrowmark Ltd | Construction | 2008 |
| AS Nominee Limited | Financial services | 2026 |
| ASF A2 Nominee 1 Limited | Financial services | 2026 |
| ASF A2 Nominee 2 Limited | Financial services | 2026 |
| ASF B Nominee Limited | Financial services | 2026 |
| ASF Nominees Limited | Financial services | 2026 |
| Ashton Fitness Ltd | Arts & recreation | 2023 |
| ASK Scott Design Ltd | Professional & scientific | 2022 |
| ASL Leisure Limited | Wholesale & retail | 2017 |
| ASM Lettings & Property Management Ltd | Households | 2019 |
| Aspen Group Holdings Ltd | Real estate | 2025 |
| Aspire Electrical North East Ltd | Construction | 2013 |
| Aspire Learning Support and Wellbeing C.I.C. | Education | 2012 |
| Astonhale Limited | Administrative & support | 2018 |
| Aswan Lotus Limited | Professional & scientific | 2020 |
| ASY Maintenance Services Ltd | Manufacturing | 2022 |
| AT Installations (NE) Ltd | Construction | 2024 |
| ATD (NE) Ltd | Mining & quarrying | 2016 |
| Atlas Door Services Limited | Manufacturing | 2024 |
| Auditmind Intelligence Limited | Information & communication | 2026 |
| Autonomy Holdings Limited | Financial services | 2016 |
| Avery Reid Limited | Real estate | 2020 |
| Aviary Art Limited | Wholesale & retail | 2019 |
| Award Winning Greenfingers Limited | Administrative & support | 2010 |
| Axis Demolition Ltd | Construction | 2013 |
| Ayalia Limited | Hospitality | 2023 |
| B J Walton Building Contractors Limited | Construction | 1996 |
| B Resilient Ltd | Health & social care | 2024 |
| B-Tec Electircal Ltd | Construction | 2025 |
| B.E Facilities Limited | Construction | 2019 |
| B.M.W. Building Products Limited | Manufacturing | 1985 |
| B1 Safety Consultancy Ltd | Public administration | 2019 |
| Badesha Leisure Limited | Hospitality | 2018 |
| Badesha Property Investments Ltd | Real estate | 2010 |
| Bainbridge Properties Ltd | Real estate | 2024 |
| Bains Lean Consulting Limited | Professional & scientific | 2019 |
| Balger Ltd | Real estate | 2015 |
| Ballantyne Accountants Ltd | Information & communication | 2008 |
| Baller's DEN Learning Hub CIC | Education | 2025 |
| Baller's DEN Support Services Limited | Education | 2023 |
| Ballymagash Investments Limited | Extraterritorial | 2015 |
| Balmar Ltd | Transport & logistics | 2016 |
| Balmoral Accountancy Services (N.E.) Limited | Professional & scientific | 2011 |
| Balmoral Accountancy Services Ltd | Professional & scientific | 2015 |
| Bannister Property Services Ltd | Construction | 2024 |
| Bannon Electrical Services Limited | Construction | 2020 |
| Bar None (North East) Limited | Real estate | 2003 |
| Barrys Wholesale Fruit & VEG Ltd | Wholesale & retail | 2024 |
| Bars Factors Limited | Wholesale & retail | 1997 |
| Basetide Limited | Real estate | 2002 |
| Batuk Holidays Limited | Administrative & support | 2024 |
| Baumahn Property Company Ltd. | Hospitality | 2024 |
| Baumahn Technical Services Ltd | Construction | 2025 |
| Baxter Pizza NE Ltd | Hospitality | 2025 |
| BC Property Limited | Real estate | 2016 |
| Bdtoukspice Limited | Hospitality | 2023 |
| BE Recovery and Transportation Limited | Transport & logistics | 2020 |
| Beach Butler Limited | Arts & recreation | 2025 |
| Beadnell Management Limited | Households | 2002 |
| Beam Lettings Ltd | Households | 2022 |
| Beamish Plant Services Limited | Wholesale & retail | 2017 |
| Beamish Tyres Limited | Other services | 2006 |
| Beauty and Cosmetics Sunderland Ltd | Wholesale & retail | 2023 |
| Beauty and Cosmetics the Galleries Ltd | Wholesale & retail | 2023 |
| Bell Hardy Properties Ltd | Real estate | 2021 |
| Bellgrave Ltd | Hospitality | 2026 |
| Bellissimo Beauty Limited | Other services | 2018 |
| Bench Properties Limited | Real estate | 2014 |
| BER Construction Ltd | Construction | 2020 |
| Bespoke Maintenance (North East) Ltd | Construction | 2024 |