| Awesometistic CIC | Administrative & support | 2018 |
| AWP Renewable Energy Ltd | Construction | 2026 |
| AWR Roofing & Aluminium Rainwater Systems Limited | Construction | 2003 |
| Awsm Consultancy Ltd | Professional & scientific | 2025 |
| Awsm Property Ltd | Real estate | 2024 |
| Ax-Ai Ltd | Administrative & support | 2023 |
| Axis Beer Company Ltd | Manufacturing | 2021 |
| Axis Protect Ltd | Wholesale & retail | 2023 |
| AXS Inspection Services Limited | Professional & scientific | 2013 |
| Axwell Limited | Administrative & support | 2015 |
| AY Yildiz Ltd | Other services | 2020 |
| Ayan Superstore Ltd | Wholesale & retail | 2023 |
| Ayoosha Limited | Wholesale & retail | 2025 |
| Ayoub Residential Solutions Ltd | Financial services | 2026 |
| AZ Khan Ltd | Health & social care | 2021 |
| Azad MS Ltd | Health & social care | 2011 |
| Azim Healthcare Ltd | Wholesale & retail | 2025 |
| Aziz Brothers (NE) Ltd | Wholesale & retail | 2018 |
| Azolity Ltd | Real estate | 2025 |
| AZQ Limited | Real estate | 2023 |
| Azure Bathrooms and Heating Limited | Construction | 2020 |
| Azure Blue (NE) Limited | Hospitality | 2019 |
| B & H Pizzeria Ltd | Hospitality | 2018 |
| B - T Rigging Limited | Construction | 2017 |
| B a Joinery Solutions Ltd | Construction | 2023 |
| B and P Dairymen Limited | Wholesale & retail | 2002 |
| B Capital Holdings Limited | Financial services | 2018 |
| B J Building Services North East Limited | Manufacturing | 2025 |
| B J Property Scaffolding Services North East Ltd | Construction | 2023 |
| B Jacob Consult Ltd | Wholesale & retail | 2021 |
| B M F Construction (NE) Limited | Construction | 2012 |
| B&Dl Ltd | Health & social care | 2016 |
| B&K Project Management Ltd | Professional & scientific | 2023 |
| B&N Bargain Limited | Wholesale & retail | 2025 |
| B-Skill Limited | Education | 2000 |
| B.J Property Maintenance (NE) Limited | Construction | 2019 |
| B.J Property Re-Pointing Specialists Limited | Construction | 2017 |
| B1TKD Limited | Arts & recreation | 2014 |
| B2B Injection Moulding Ltd | Manufacturing | 2019 |
| B3LU Limited | Wholesale & retail | 2025 |
| B3SH Limited | Hospitality | 2025 |
| B7 Care Group Ltd | Financial services | 2022 |
| BA Optical Services Ltd | Wholesale & retail | 2025 |
| BA Residential Properties Ltd | Real estate | 2019 |
| Baba Supermarket Ltd. | Wholesale & retail | 2012 |
| BAC Car Sales Ltd | Wholesale & retail | 2022 |
| Bacchae Productions Limited | Information & communication | 2018 |
| Back Chapman Ltd | Real estate | 2024 |
| Backer Fundraising Services Limited | Information & communication | 2025 |
| Backline OS Ltd | Professional & scientific | 2026 |
| Backworth Estates Limited | Real estate | 2025 |
| Backworth Project Limited | Real estate | 2025 |
| Bactalogical Group Ltd | Financial services | 2021 |
| BAH Electrical (NE) Limited | Construction | 2019 |
| Bahama Hotels Ltd | Hospitality | 2021 |
| Bail & Stone Ltd | Wholesale & retail | 2023 |
| Bailey Farming Limited | Agriculture & fishing | 2018 |
| Bainford Properties Ltd | Real estate | 2021 |
| Balinder Ladhar Ltd | Health & social care | 2023 |
| Balloon Training Online Limited | Education | 2010 |
| Ballys Beauty Hub Ltd | Wholesale & retail | 2026 |
| Baltic Publications Limited | Information & communication | 2002 |
| Bambi Engineering Limited | Professional & scientific | 2019 |
| Bameli Limited | Real estate | 2017 |
| Banana Crocodile Ltd | Professional & scientific | 2022 |
| Bandegroup Ltd | Real estate | 2022 |
| Bandesha Ltd | Wholesale & retail | 2024 |
| Bankview Ceramics Ltd | Manufacturing | 2010 |
| Bar Central Limited | Hospitality | 2019 |
| Bar Yochai Investments Ltd | Real estate | 2024 |
| Barber Shop Durham Road Ltd | Other services | 2025 |
| Barkley Group Ltd | Professional & scientific | 2025 |
| Barnes Sweets Ltd | Wholesale & retail | 2022 |
| Barnwood Park School Limited | Education | 2024 |
| Baron House Ltd | Professional & scientific | 2023 |
| Barrass Tiling Ltd | Construction | 2015 |
| Barrel and Crown Co. Ltd | Manufacturing | 2025 |
| Barrio Comida Limited | Hospitality | 2019 |
| Barry Holmes Roofing & Building Services Ltd | Construction | 2025 |
| Barry Noble Enterprises | Extraterritorial | 1979 |
| Bartram Flooring Supplies Limited | Construction | 2021 |
| Barwarwick Social NE2 Ltd | Hospitality | 2024 |
| Basri and Partners Ltd | Health & social care | 2021 |
| Bass Logistics Ltd | Transport & logistics | 2026 |
| Batian Properties Ltd | Real estate | 2021 |
| Batian Property Group Ltd | Financial services | 2021 |
| Batian Property Investments Ltd | Real estate | 2021 |
| Batimosinvest Ltd | Real estate | 2024 |
| Batlehoo Ltd | Wholesale & retail | 2026 |
| Batra-Sehgal Ltd | Health & social care | 2013 |
| Battle Bunker Ltd | Other services | 2016 |
| Bavanar Limited | Extraterritorial | 1981 |
| Baxter Pearse Financial Consultants Limited | Financial services | 2014 |
| Bay UK (North East) Limited | Administrative & support | 2026 |
| Baybays Beauty Ltd | Other services | 2016 |
| Bayleaf Care Limited | Health & social care | 2023 |
| Bayleaf Healthcare Services Ltd | Administrative & support | 2025 |
| BB Croft Holdings Limited | Financial services | 2023 |
| BB Global Freight Limited | Transport & logistics | 2024 |
| Bb's Elite Cleaning Limited | Administrative & support | 2014 |