| Bonner Training and Tuition Limited | Information & communication | 2015 |
| Bonnie Bear and Friends Day Nursery Limited | Health & social care | 2025 |
| Bonnies Childcare Limited | Health & social care | 2022 |
| Bonnymead Properties Ltd | Real estate | 2024 |
| Bonsai Technical Services Limited | Information & communication | 2011 |
| Bonsaiuk Ltd | Wholesale & retail | 2021 |
| BOO Costumes Limited | Wholesale & retail | 2016 |
| BOO Education Limited | Education | 2023 |
| BOO Pizza Ltd | Hospitality | 2026 |
| Booboo Retail Trading FRANCHISE1 Ltd | Hospitality | 2023 |
| Booboo Retail Trading Limited | Hospitality | 2019 |
| Booey Ltd | Professional & scientific | 2007 |
| Book Accommodation Derby Limited | Real estate | 2022 |
| Booker Logistics Limited | Transport & logistics | 2020 |
| Booking Orchard Ltd | Information & communication | 2025 |
| Boom Consultants Limited | Professional & scientific | 2021 |
| Boom Investments Limited | Real estate | 2021 |
| Boom Online Marketing Limited | Other services | 2010 |
| Boom Project Holdings Limited | Other services | 2011 |
| Boomprompt Limited | Households | 1988 |
| Boorley Gardens Residents Management Company Limited | Households | 2022 |
| Boost Consultant Service Ltd | Professional & scientific | 2023 |
| Boost Hanover Ltd | Real estate | 2025 |
| Boost Investment Group Ltd | Real estate | 2020 |
| Boost Ventures Ltd | Real estate | 2023 |
| Boostyourmarket Limited | Information & communication | 2017 |
| Booth Contract Services Limited | Other services | 2021 |
| Bootiful Minds Community Interest Company | Wholesale & retail | 2023 |
| Booze Buster Midlands Ltd | Wholesale & retail | 2026 |
| Boozies Limited | Hospitality | 2019 |
| Bopet Investment Limited | Real estate | 2021 |
| Bora Fruit & VEG Ltd | Wholesale & retail | 2023 |
| Boram Holdings Ltd | Financial services | 2023 |
| Borderless Cloud Consulting Ltd | Administrative & support | 2026 |
| Boreham Wood Football Club (Utilities) Limited | Arts & recreation | 1963 |
| Born Art Muzic Ltd | Manufacturing | 2024 |
| Born to Party Ltd | Arts & recreation | 2021 |
| Born to Perform College Ltd | Arts & recreation | 2024 |
| Born to Perform Events Limited | Arts & recreation | 2023 |
| Borrowash Victoria AFC Limited | Arts & recreation | 2026 |
| Borrowash Victoria Holdings Ltd | Arts & recreation | 2025 |
| Boscastle Locomotive Limited | Transport & logistics | 2005 |
| Boss Cutt Ltd | Other services | 2023 |
| Boss Homes Ltd | Real estate | 2021 |
| Bossadevtech Ltd | Information & communication | 2026 |
| Bossick Enterprises Limited | Hospitality | 1996 |
| Bossick Hotels Limited | Hospitality | 2016 |
| Bossy Threads Limited | Wholesale & retail | 2025 |
| Boston Warwick Ltd | Professional & scientific | 2022 |
| Bottega GV Ltd | Hospitality | 2023 |
| Bottom Line Trading Ltd | Wholesale & retail | 2022 |
| Boujee Aesthetics Services Ltd | Health & social care | 2022 |
| Bounce Mania Derby Ltd | Administrative & support | 2024 |
| BOUNDARY8 Ltd | Real estate | 2024 |
| Boundless Healthcare Ltd | Health & social care | 2018 |
| Bouquet Little Eaton Ltd | Wholesale & retail | 2024 |
| Boutique Florists Limited | Administrative & support | 2008 |
| Boutique Villa Ltd | Real estate | 2024 |
| Bowbeaus Limited | Arts & recreation | 2019 |
| Bowbridge Garage Limited | Wholesale & retail | 2002 |
| Bowe Residential Ltd | Real estate | 2024 |
| Bowe UK Limited | Manufacturing | 2010 |
| Bowes Fencing and Landscaping Ltd | Administrative & support | 2023 |
| Bowes Group Ltd | Manufacturing | 2024 |
| Bowler Adams LLP | | 2007 |
| Box Construction (Holdings) Limited | Financial services | 2023 |
| Boxara Ltd | Wholesale & retail | 2025 |
| Boxfree Ltd | Information & communication | 2006 |
| Boxville Ltd | Real estate | 2023 |
| Boxwise Foundation | Education | 2023 |
| Boyar Properties Ltd | Real estate | 2024 |
| Boyd Property Portfolio Ltd | Real estate | 2026 |
| Boyer Court (Derby) Management Company Limited | Households | 2004 |
| Bozans RR Ltd | Transport & logistics | 2020 |
| Bozcoandsonsas Limited | Financial services | 2024 |
| BP Green Gardens Limited | Administrative & support | 2024 |
| Bpec Certification Limited | Professional & scientific | 1997 |
| Bpec Services Limited | Education | 1994 |
| Bplaced Ltd | Information & communication | 2025 |
| BPM (Derby) Management Company Ltd | Households | 2024 |
| BPO Solutions Limited | Professional & scientific | 2022 |
| BPR Protect Limited | Financial services | 2016 |
| BPS Property Developments Limited | Real estate | 2018 |
| BPS Property Group Limited | Construction | 2023 |
| BR Civils Ltd | Construction | 2026 |
| BR Holdings Limited | Professional & scientific | 2007 |
| BR Transport Ltd | Transport & logistics | 2026 |
| Bracemile Ltd | Health & social care | 2014 |
| BRACHIR51 Ltd | Wholesale & retail | 2025 |
| Bracklesham Grove Residents Management Company Limited | Households | 2021 |
| Bradbery Gardens Management Company Limited | Households | 2016 |
| Bradbury Harper Ltd | Education | 2012 |
| Bradford-Hall Limited | Construction | 2011 |
| Bradgate Park View Management Company Limited | Real estate | 2007 |
| Bradley and Jefferies Solicitors Limited | Professional & scientific | 2005 |
| Bradley Court Property Limited | Real estate | 2008 |
| Bradley Mews Management Company Limited | Households | 2003 |
| Bradmoretech Ltd | Other services | 2024 |
| Bradshaw International Holdings Limited | Manufacturing | 2011 |
| Bradwell Close Management Company Limited | Real estate | 2010 |