| AZTECH76 Engineering Ltd | Administrative & support | 2026 |
| Azth Ltd | Transport & logistics | 2019 |
| Azure SIX Limited | Administrative & support | 2025 |
| Azzurre Limited | Professional & scientific | 2016 |
| Azzurri Engineering Limited | Professional & scientific | 2018 |
| B & C Property PVT Ltd | Real estate | 2025 |
| B & C Sports Limited | Wholesale & retail | 2012 |
| B & C Sports Retail Limited | Wholesale & retail | 2021 |
| B & E J H Ltd | Financial services | 2022 |
| B & E Renovation Limited | Construction | 2020 |
| B & R Fabrications Limited | Manufacturing | 1998 |
| B & S Financial Management Limited | Financial services | 1986 |
| B C J Engineering Services Limited | Professional & scientific | 2005 |
| B Design 01 Limited | Administrative & support | 2015 |
| B Ecology Ltd | Professional & scientific | 2020 |
| B Hartley Site Services Limited | Administrative & support | 2013 |
| B M Bathrooms Ltd | Wholesale & retail | 2018 |
| B Mosher Industries Limited | Professional & scientific | 2024 |
| B Programme Solution Ltd | Information & communication | 2024 |
| B ROY Ltd | Health & social care | 2009 |
| B&Dreams Co. Ltd | Wholesale & retail | 2020 |
| B&J Properties and Housing Ltd | Real estate | 2025 |
| B&L Harvey Consulting Limited | Professional & scientific | 2019 |
| B&S Refractory Linings Ltd | Construction | 2007 |
| B-Engineering (NW) Ltd | Construction | 2002 |
| B-W Assets Limited | Real estate | 2025 |
| B.A.T. Ecological Ltd. | Professional & scientific | 2018 |
| B.F.Properties Ltd | Real estate | 2021 |
| B.G. Roofing (Warrington) Limited | Construction | 2002 |
| B.Marsh Limited | Construction | 2019 |
| B15 Group Plumbing and Heating Ltd | Construction | 2025 |
| B1B Consulting Ltd | Information & communication | 2025 |
| B2 Technologies Limited | Information & communication | 2015 |
| B3NET Solutions Limited | Administrative & support | 2016 |
| B8RE Trustee Limited | Professional & scientific | 2020 |
| BAA Consultancy Ltd | Professional & scientific | 2017 |
| Baby Coffee Bean Limited | Hospitality | 2026 |
| Baby Dog Films Limited | Arts & recreation | 2019 |
| Baby Squids Cheshire Ltd | Education | 2025 |
| Babylon Retro Ltd | Hospitality | 2021 |
| BAC Group Ltd | Professional & scientific | 2017 |
| Back Nine UK Ltd | Arts & recreation | 2025 |
| Back Stream Limited | Real estate | 2024 |
| Back to Formula Limited | Information & communication | 2016 |
| Backhouse Estates Limited | Real estate | 2016 |
| Backhouse LB Limited | Real estate | 2026 |
| Backup Energy Ltd | Energy | 2022 |
| Backup Plan Limited | Administrative & support | 2024 |
| Backyard Bistro Ltd | Construction | 2025 |
| Bact Capital Ltd | Real estate | 2026 |
| BAD Plan Limited | Professional & scientific | 2023 |
| Bada Bling Limited | Arts & recreation | 2006 |
| Badger Construction Limited | Administrative & support | 2013 |
| Badhen Property Limited | Real estate | 2025 |
| Badmos Tech Ltd | Administrative & support | 2025 |
| Badre Limited | Hospitality | 2025 |
| Baileys Motor Trading Ltd | Wholesale & retail | 2025 |
| Baillie Consultancy Limited | Administrative & support | 2013 |
| Baillie Engineering Services Limited | Administrative & support | 2013 |
| Bainbridge Enterprises (UK) Limited | Professional & scientific | 1998 |
| Baits Direct Ltd | Agriculture & fishing | 2024 |
| Baja Investments Ltd | Financial services | 2018 |
| Baked Potato TOO Ltd | Hospitality | 2008 |
| Baker & Clark Limited | Administrative & support | 2018 |
| Balance & Shield Ltd | Professional & scientific | 2025 |
| Balanced Design Consultancy Limited | Administrative & support | 2025 |
| Balas Trucks Transporter Ltd | Transport & logistics | 2016 |
| Balay Tech Ltd | Information & communication | 2026 |
| Balboa Recruitment Limited | Professional & scientific | 2022 |
| Balcnoch Ltd | Administrative & support | 2023 |
| Balconyview Limited | Extraterritorial | 2001 |
| Baldry Consulting Ltd | Administrative & support | 2025 |
| Baldwins Property Services Ltd | Real estate | 2022 |
| Balearic Escapes Ltd | Transport & logistics | 2026 |
| Balf Services Ltd | Wholesale & retail | 2016 |
| Ballma Ltd | Financial services | 2002 |
| Baltic Delivery Service Ltd | Wholesale & retail | 2019 |
| Baltrina Consulting Limited | Administrative & support | 2025 |
| BAM BAM Madame Ltd | Professional & scientific | 2022 |
| BAM ENG Ltd | Administrative & support | 2022 |
| Bamav Limited | Education | 2011 |
| Bamba Steel Ltd | Professional & scientific | 2017 |
| Bamboo Fabrications Limited | Real estate | 2025 |
| Bamboo Facade Installations Limited | Construction | 2021 |
| Bamboo Garden Hot POT Limited | Hospitality | 2024 |
| Bamford & Savill Ltd | Hospitality | 2016 |
| Banam Properties Limited | Real estate | 2023 |
| Bancroft Boarding Kennels Ltd | Agriculture & fishing | 2018 |
| Bancroft Cat Lodge Ltd | Agriculture & fishing | 2024 |
| Bandit the Dog Ltd | Administrative & support | 2020 |
| Bang on Builders Ltd | Other services | 2016 |
| Banister Pet Store Limited | Wholesale & retail | 2002 |
| Bank Quay Autos Ltd | Wholesale & retail | 2025 |
| Banshee's Cottage Limited | Extraterritorial | 2014 |
| Bar 83 Ltd | Hospitality | 2026 |
| Barassie & Hazel Ltd | Wholesale & retail | 2024 |
| Barben Limited | Health & social care | 2016 |
| Barber Space Ltd | Other services | 2025 |
| Barberossa Grooming Limited | Other services | 2023 |
| Barberworlduk Ltd | Wholesale & retail | 2025 |