| Ayres Property Services Ltd | Construction | 2026 |
| Azaleos Holdings Limited | Extraterritorial | 2021 |
| Aztec Design (Systems) Limited | Information & communication | 1988 |
| Azzaro Marine Limited | Professional & scientific | 2011 |
| Azzaro Yachting Limited | Professional & scientific | 2011 |
| Azzybook Limited | Administrative & support | 2023 |
| B & L Premier Care Limited | Health & social care | 2008 |
| B M Range East Ltd | Wholesale & retail | 2019 |
| B&B Bakery Ltd | Wholesale & retail | 2019 |
| B&B Romanesc Magazine Limited | Wholesale & retail | 2022 |
| B&Mm Logistics Ltd | Transport & logistics | 2021 |
| B.B Media LAB Ltd | Information & communication | 2025 |
| B.E.P Housing Limited | Real estate | 2024 |
| B.N.B Building Services Ltd | Construction | 2025 |
| B2B Transport Ltd | Transport & logistics | 2024 |
| Ba.Wi Ltd | Transport & logistics | 2025 |
| Baddesley Knight Estates Ltd | Real estate | 2022 |
| Baddesley Knight Holdings Ltd | Financial services | 2022 |
| Bafm Consulting Limited | Professional & scientific | 2017 |
| Bagnalls Engineering Limited | Manufacturing | 2009 |
| Bailey Dean Properties Ltd | Real estate | 2005 |
| Baileys of Ashbourne Ltd | Wholesale & retail | 2022 |
| Baird Foods EOT Trustee Limited | Financial services | 2024 |
| Baird Foods Holdings Limited | Wholesale & retail | 2017 |
| Baird Foods Limited | Wholesale & retail | 1996 |
| Baird Foods Services Limited | Manufacturing | 2016 |
| Baird Homes Limited | Construction | 2007 |
| Baker & Grogan Ltd | Administrative & support | 2009 |
| Bali Consulting Limited | Professional & scientific | 2023 |
| Balikbayan Box UK Ltd | Transport & logistics | 2019 |
| Balushree Limited | Real estate | 2022 |
| Bannells Farm Limited | Agriculture & fishing | 2009 |
| Bar Healthcare Ltd | Health & social care | 2023 |
| Barbarous Words Ltd | Information & communication | 2025 |
| Barberry Court Management Company Limited | Administrative & support | 2005 |
| Baretts Holdings Limited | Financial services | 2024 |
| Bargain 5 Limited | Wholesale & retail | 2025 |
| Bargain Basket (PVT) Ltd | Wholesale & retail | 2025 |
| Barley Fields (Burton on Trent) Estate Management Limited | Households | 2005 |
| Barncroft Accountancy Services Limited | Professional & scientific | 2018 |
| Barnes Business Solutions Limited | Construction | 2025 |
| Barrett & Booth Limited | Professional & scientific | 2018 |
| Barrie Phillips Automation Limited | Information & communication | 1996 |
| Barton Consulting Ltd | Professional & scientific | 2022 |
| Barton DS Ltd | Health & social care | 2014 |
| Barton Fryers Limited | Wholesale & retail | 2022 |
| Barton Gate Properties Ltd | Real estate | 2001 |
| Barton Green Services Limited | Manufacturing | 2016 |
| Barton Turns Developments Limited | Hospitality | 2005 |
| Barton Village Taxis Ltd | Transport & logistics | 2018 |
| Basat Safdar Begum Ltd | Wholesale & retail | 2024 |
| Base Event Structures Limited | Arts & recreation | 2022 |
| Bassburst UK Ltd | Arts & recreation | 2025 |
| Baswich Business Services Limited | Professional & scientific | 2004 |
| Batkin Electrical Services Limited | Construction | 2010 |
| Battisson Holdings Limited | Financial services | 2025 |
| Bayleaf Control Risk Group Limited | Administrative & support | 2024 |
| Bayleaf Holdings (Derby) Ltd | Health & social care | 2023 |
| Bayleaf Staffing Agency Ltd | Administrative & support | 2025 |
| Bayliss Cleaning and Decorators Ltd | Administrative & support | 2023 |
| Baynel Ltd | Professional & scientific | 2018 |
| Bayston Associates Limited | Wholesale & retail | 2012 |
| BAZ Online Trading Ltd | Wholesale & retail | 2026 |
| Bazirj Limited | Wholesale & retail | 2022 |
| BB Power Ltd | Construction | 2025 |
| BB Training & Compliance Ltd | Professional & scientific | 2026 |
| BCS Group Ltd | Construction | 2025 |
| BCS Home Care Ltd | Health & social care | 2026 |
| BCT Group Limited | Professional & scientific | 2017 |
| BDGF26 Ltd | Construction | 2026 |
| BE More Roar Limited | Professional & scientific | 2019 |
| Beacon for Health Ltd | Health & social care | 2023 |
| Beaumont Procurement Ltd | Professional & scientific | 2022 |
| Beauty Bulb Ltd | Other services | 2018 |
| Beauty by Abbie Ltd | Health & social care | 2023 |
| Beauty Hub Saloon Ltd | Other services | 2025 |
| Beauty Salon Avio Ltd | Other services | 2025 |
| Bebe Citeste Ltd | Wholesale & retail | 2025 |
| Bechance Co. Limited | Health & social care | 2015 |
| Beck & Pollitzer Engineering Contracts Limited | Professional & scientific | 1999 |
| Beck & Pollitzer Engineering Holdings Ltd. | Financial services | 1998 |
| Beck & Pollitzer Engineering Limited | Manufacturing | 1993 |
| BEE Blessed Community Interest Company | Wholesale & retail | 2022 |
| Beech Drive 1968 Limited | Extraterritorial | 2014 |
| Belfor Franchise Group UK Limited | Administrative & support | 1987 |
| Bell & Berry Ltd | Wholesale & retail | 2025 |
| Bella Beauti Ltd | Wholesale & retail | 2020 |
| Belv Ltd | Construction | 2025 |
| Belvedere Bowls Club | Arts & recreation | 2012 |
| Benchmark Immigration Legal Limited | Professional & scientific | 2020 |
| Benchmark Legal Limited | Professional & scientific | 2015 |
| Benlot Limited | Real estate | 2020 |
| Benodet Breaks Limited | Administrative & support | 2006 |
| Beresford's Flooring Limited | Construction | 2002 |
| Berte Ltd | Transport & logistics | 2019 |
| Berwyn Properties Ltd | Real estate | 2025 |
| Bespoke Barbers of Tutbury Limited | Other services | 2019 |
| Bespoke Bars & Restaurants Limited | Professional & scientific | 2025 |
| Bespoke GRC Limited | Professional & scientific | 2025 |
| Bespoke Group Property Ltd | Professional & scientific | 2022 |