| AYP Healthcare Ltd | Health & social care | 2015 |
| Ayshascloset Ltd | Professional & scientific | 2026 |
| AYU Street Limited | Hospitality | 2025 |
| AYY Management Limited | Administrative & support | 2022 |
| Ayyaz Patel Ltd | Wholesale & retail | 2025 |
| AZ Enterprises International Limited | Health & social care | 2026 |
| AZ Fitness Limited | Arts & recreation | 2020 |
| AZ International Enterprises Ltd | Health & social care | 2026 |
| AZ Invest Limited | Wholesale & retail | 2023 |
| Az-Tech Telecoms Limited | Wholesale & retail | 2025 |
| Azad Global Services Ltd | Financial services | 2022 |
| Azaraqshah Ltd | Hospitality | 2024 |
| Azaris Global Ltd | Wholesale & retail | 2025 |
| AZD Systems Ltd | Professional & scientific | 2020 |
| Azhtec Properties Ltd | Real estate | 2026 |
| Azina Limited | Wholesale & retail | 2002 |
| Aziz Catering Services Ltd | Hospitality | 2021 |
| AZK Fashion Ltd | Wholesale & retail | 2024 |
| Azleen Ltd | Wholesale & retail | 2025 |
| Azoro Limited | Wholesale & retail | 2024 |
| AZP Property Ltd | Real estate | 2026 |
| AZS Group Limited | Water & waste | 2021 |
| Azuramed Ltd | Health & social care | 2025 |
| Azure Assets Limited | Real estate | 2022 |
| Azure Capital UK Limited | Wholesale & retail | 2008 |
| B & B Chauhan Limited | Real estate | 2003 |
| B & B Chauhan Properties Limited | Real estate | 2020 |
| B & F Carter & Co Limited | Manufacturing | 1992 |
| B & P Cafe Bars NW Ltd | Hospitality | 2023 |
| B & R Direct ( UK ) Limited | Wholesale & retail | 2013 |
| B & S Childcare Services Limited | Health & social care | 2015 |
| B and S Textiles Limited | Wholesale & retail | 2012 |
| B C Cookson Holdings Limited | Wholesale & retail | 2014 |
| B Carrigan Property Ltd | Real estate | 2025 |
| B Couture Limited | Wholesale & retail | 2020 |
| B Digital Marketing Ltd | Professional & scientific | 2023 |
| B F Blezard Limited | Agriculture & fishing | 2017 |
| B G Fencing Limited | Construction | 1986 |
| B G Welding & Fabrication Ltd | Manufacturing | 2016 |
| B Hall Limited | Construction | 2016 |
| B J Holmes & Co Limited | Construction | 2010 |
| B J Watson (Funerals) Limited | Extraterritorial | 2000 |
| B K Utility Services Limited | Construction | 2003 |
| B L I S Maintenance Solutions Limited | Administrative & support | 2010 |
| B Margerison Builders Limited | Construction | 2022 |
| B N Greenwood Contracting Limited | Construction | 2007 |
| B P Digital Ltd | Manufacturing | 2018 |
| B Parton Property Limited | Real estate | 2025 |
| B S Stainless Holdings Limited | Wholesale & retail | 2017 |
| B S Stainless Limited | Wholesale & retail | 1998 |
| B Wood Limited | Agriculture & fishing | 2004 |
| B Z T Limited | Health & social care | 2008 |
| B&D Belchev Limited | Transport & logistics | 2024 |
| B&F Healthcare Ltd | Health & social care | 2023 |
| B&G Consulting Ltd | Professional & scientific | 2023 |
| B&S Investment Property Ltd | Real estate | 2025 |
| B&V Paving Limited | Administrative & support | 2024 |
| B'Creamy Dessert Bar Ltd | Hospitality | 2025 |
| B-Niki Limited | Households | 2024 |
| B. & D. Print Services Limited | Manufacturing | 1976 |
| B. & N. Electrical Ltd | Construction | 2021 |
| B. Cookson Limited | Wholesale & retail | 1984 |
| B. Robinson & Company Limited | Professional & scientific | 1993 |
| B.A.R Logistics Limited | Transport & logistics | 2013 |
| B.D. House Clearance Ltd | Water & waste | 2023 |
| B.G. Pavers Limited | Manufacturing | 1990 |
| B.I. Properties Limited | Real estate | 1994 |
| B.J.Corrigan Limited | Manufacturing | 2011 |
| B.O.O.S.H Club Ltd | Health & social care | 2022 |
| B2 Bookkeeper Limited | Professional & scientific | 2023 |
| B22 Nails & Beauty Ltd | Other services | 2025 |
| B2B Barbers Ltd | Other services | 2026 |
| B2BRIT Exim Ltd | Transport & logistics | 2024 |
| B2BRIT Ltd | Wholesale & retail | 2022 |
| B3 Industries Ltd | Manufacturing | 2025 |
| Baba's Biryani Limited | Hospitality | 2020 |
| Babar Transport Ltd | Other services | 2024 |
| Babawest Ltd | Health & social care | 2020 |
| Babel Town Limited | Construction | 2020 |
| Babes London Ltd | Wholesale & retail | 2012 |
| Babmaes Nominees Limited | Extraterritorial | 2005 |
| Baby 3 ME Ltd | Wholesale & retail | 2024 |
| Baby Beat Ltd | Wholesale & retail | 1999 |
| Baby Blossoms Nursery Ltd | Health & social care | 2022 |
| Baby Cloud Ltd | Wholesale & retail | 2020 |
| Baby Sensory Chorley Limited | Education | 2018 |
| Babylon Hookah Market Limited | Wholesale & retail | 2025 |
| Babysham Ltd | Other services | 2026 |
| Back Care Solutions Limited | Wholesale & retail | 2002 |
| Back Four Limited | Professional & scientific | 2011 |
| Back in Action Chiropractic Limited | Health & social care | 2015 |
| Back to Eden's Kitchen CIC | Other services | 2025 |
| Backhouse Single PLY Ltd | Construction | 2019 |
| BAD Zebedee Limited | Wholesale & retail | 2018 |
| Badger Alarms & Cctv (SW) Limited | Administrative & support | 2024 |
| Badger Motorsport Limited | Arts & recreation | 1994 |
| Badger Office Supplies Limited | Wholesale & retail | 2006 |
| Badshah Haulage Ltd | Transport & logistics | 2020 |
| Bahidor Ltd | Wholesale & retail | 2026 |
| Bailey Financial Services (Whitestake) Limited | Financial services | 2008 |