| Aria Builders Ltd | Construction | 2025 |
| Aria Plastering Ltd | Construction | 2025 |
| Ariston Ltd | Professional & scientific | 2006 |
| ARM Fabrications Ltd | Manufacturing | 2025 |
| Armstrong Wilson Associates Limited | Education | 2002 |
| Arprop Ltd | Real estate | 2015 |
| Artholic Ltd | Professional & scientific | 2019 |
| Artistry Bathrooms ( Domestic ) Ltd | Construction | 2025 |
| Ashgreen Energyfarm Limited | Energy | 2016 |
| ASJ Lettings Limited | Real estate | 2026 |
| Aston Inspection Services Ltd | Mining & quarrying | 2017 |
| Astute Property Limited | Real estate | 2020 |
| Atherton Training & Development Limited | Professional & scientific | 2021 |
| Atlantic Bidco Limited | Financial services | 2018 |
| Atlantic Midco Limited | Financial services | 2018 |
| Atlantic Topco Limited | Financial services | 2018 |
| Atlas Reach and Wash Ltd | Administrative & support | 2020 |
| Attractions Digital Print & Sign Ltd | Manufacturing | 2024 |
| AUK Accountancy Ltd | Professional & scientific | 2025 |
| Aunger Guitars Ltd | Manufacturing | 2017 |
| Aurora Sky Limited | Extraterritorial | 2011 |
| Aurum Real Estate Ltd | Real estate | 2017 |
| Auto Prep Repairs Ltd | Wholesale & retail | 2017 |
| Automise Ltd | Information & communication | 2024 |
| Avantis HR Limited | Administrative & support | 2006 |
| Avenue and Greene Drinks Ltd | Wholesale & retail | 2019 |
| Avior Apartments Ltd | Real estate | 2019 |
| AW Cooper Ltd | Wholesale & retail | 2023 |
| AWS Global Ltd | Arts & recreation | 2022 |
| Aytball Film Ltd | Information & communication | 2025 |
| Azfitnessorg Ltd | Arts & recreation | 2025 |
| B & B Air Conditioning & Refrigeration Ltd | Energy | 2003 |
| B & S Superstores Limited | Wholesale & retail | 2002 |
| B & T Rendering Limited | Construction | 2010 |
| B B Trade Kitchens & Bedrooms Limited | Manufacturing | 1989 |
| B Grayson TM Ltd | Construction | 2024 |
| B Ridley Construction Limited | Construction | 2025 |
| B&H Trading Limited | Extraterritorial | 2022 |
| B.A. Italian Restaurant Ltd | Hospitality | 2018 |
| B.H Deli Limited | Hospitality | 2025 |
| B.Willis Agriculture Services Ltd | Agriculture & fishing | 2022 |
| Back 2 Basics Coaching Limited | Arts & recreation | 2015 |
| Badger Mini BUS Hire Limited | Transport & logistics | 1996 |
| Bagel & Bailey Limited | Wholesale & retail | 2025 |
| Ballerswish Ltd | Administrative & support | 2024 |
| Bargain Supps Ltd | Wholesale & retail | 2026 |
| Baroons & Sons Co Ltd | Health & social care | 2013 |
| Barrass Analysis Ltd | Professional & scientific | 2013 |
| Barrie James Art Ltd | Arts & recreation | 2021 |
| BBL NE Limited | Real estate | 2004 |
| Bbss Global Ltd | Transport & logistics | 2025 |
| BC Contractors Ltd | Real estate | 2013 |
| Bdcustoms NE Ltd | Manufacturing | 2025 |
| Beautopia Salon Ltd | Other services | 2022 |
| BEE & M Limited | Wholesale & retail | 2019 |
| Beech Hill Services Limited | Administrative & support | 2006 |
| Beechgreen Energyfarm Limited | Energy | 2019 |
| Bell Control Services Ltd | Construction | 2020 |
| Belle Leisure Ltd | Arts & recreation | 2020 |
| BEN Hanron Limited | Transport & logistics | 2003 |
| Benelli's Pizza NE Ltd | Hospitality | 2026 |
| Bengal Taste Durham Ltd | Hospitality | 2025 |
| Benlea Limited | Real estate | 2019 |
| Bennett Mortgage Partners Ltd | Financial services | 2026 |
| Bennett Property & Developments Ltd | Real estate | 2024 |
| Besford Property Ltd | Real estate | 2025 |
| Bespoke Metering Solutions Limited | Manufacturing | 2017 |
| Best Foods (North East) Ltd | Hospitality | 2018 |
| Best Value Bargain Ltd | Manufacturing | 2025 |
| Bethany Christian Centre | Other services | 2016 |
| Bethany Christian Centre Property Trust | Other services | 2016 |
| Better Billing Ltd | Energy | 2016 |
| Better Homes North East Ltd | Households | 2024 |
| Beverley Artistes Agency Limited | Other services | 1967 |
| Bevmarc Limited | Real estate | 2026 |
| Bflk Ltd | Hospitality | 2024 |
| BG Flooring (NE) Ltd | Construction | 2022 |
| Bhaji Contemporary Cuisine Ltd | Hospitality | 2017 |
| Bijoux Leisure Limited | Hospitality | 2019 |
| Binson Properties Ltd | Real estate | 2025 |
| Bishop Chadwick Catholic Education Trust | Education | 2016 |
| Bishop Chadwick Commercial Services Limited | Education | 2023 |
| Bite & Bliss HLS Ltd | Hospitality | 2026 |
| Blackberries Patisserie Ltd | Wholesale & retail | 2022 |
| Blackstone Energy Limited | Professional & scientific | 2022 |
| Bloomfield Financial Limited | Financial services | 2013 |
| Blossom Digits Ltd | Information & communication | 2026 |
| Blue Planet Solar Limited | Energy | 2019 |
| Blue Shuck Consulting Ltd | Manufacturing | 2026 |
| Bluespark Automotive Holdings Ltd | Professional & scientific | 2015 |
| Bluespark Automotive Ltd | Manufacturing | 2011 |
| BMS Warehousing Services Ltd | Transport & logistics | 2020 |
| Bodyfix Newcastle Ltd | Wholesale & retail | 2026 |
| Boha Ltd | Construction | 2025 |
| Bold Estates Limited | Real estate | 2024 |
| Bondgate Bars Ltd | Hospitality | 2020 |
| Boss Home Improvement, Bespoke Groundwork & High Pressure Cleaning Specialist Ltd | Construction | 2025 |
| Bourne Roofing Ltd | Construction | 2025 |
| Bousfield and Reid Property Management Limited | Real estate | 2020 |
| Bowes Wealth Management Limited | Financial services | 2008 |