| Blueprint Civils Ltd | Construction | 2019 |
| Bluestone Procurement & Advisory Services Limited | Professional & scientific | 2025 |
| Blyth Contractors Ltd | Information & communication | 2012 |
| Blyth Energy Limited | Energy | 2024 |
| Blyth Marble Limited | Wholesale & retail | 1969 |
| Blyth Residential Management Company Limited | Extraterritorial | 2000 |
| BM HGV Services Ltd | Wholesale & retail | 2025 |
| BMA Property Ltd | Real estate | 2024 |
| BMB Financial Services Ltd | Financial services | 2005 |
| BME Media Ltd | Information & communication | 2025 |
| Bmea Limited | Wholesale & retail | 2023 |
| BMF Direct Ltd | Wholesale & retail | 2017 |
| BMG Materials Limited | Wholesale & retail | 2024 |
| BMG Property Ltd | Construction | 2026 |
| BNS Building Supplies Limited | Wholesale & retail | 2025 |
| Bo-Kay Florist Limited | Wholesale & retail | 2008 |
| Bobbin Bicycles Ltd | Wholesale & retail | 2008 |
| Bobitrans Limited | Transport & logistics | 2020 |
| Bolsover Properties Limited | Real estate | 1966 |
| Bondhay Golf & Fishing Club Limited | Arts & recreation | 1997 |
| BONDOC4 Transervices Ltd | Transport & logistics | 2022 |
| Booth & Co Homes Ltd | Real estate | 2024 |
| Bowls Property Ltd | Real estate | 2017 |
| Bowmans Pest Management Ltd | Administrative & support | 2025 |
| Boysen Ltd | Wholesale & retail | 2023 |
| BPB Supplies Ltd | Wholesale & retail | 2025 |
| BPS Electrical Limited | Construction | 2018 |
| Braddus Homes Limited | Construction | 2023 |
| Braddus Homes SPV1 Limited | Construction | 2026 |
| Brainbox IT Solutions Ltd | Information & communication | 2023 |
| Bramall Reserve Ltd | Wholesale & retail | 2026 |
| Bramling Cross Care Limited | Health & social care | 2004 |
| Bramling Cross Registrations Limited | Professional & scientific | 1999 |
| Bravo Lima Aviation Ltd | Education | 2024 |
| Bravo Zulu Plumbing Limited | Construction | 2025 |
| Bridge Mentoring Community Interest Company | Education | 2019 |
| Bridge Street Mini Market Ltd | Wholesale & retail | 2025 |
| Bright Future Ventures Limited | Professional & scientific | 2023 |
| Bright Key Property & Lettings Ltd | Real estate | 2025 |
| Brill Burger Limited | Hospitality | 2020 |
| Bristow Education Services Limited | Education | 2019 |
| Brocklesby Electrical Ltd | Construction | 2020 |
| Brown's Rental Properties Limited | Real estate | 2026 |
| Browne Business Consultants Ltd | Professional & scientific | 2026 |
| Browne Ventures Limited | Professional & scientific | 2024 |
| Bryco Developments Ltd | Real estate | 2020 |
| Bsen Limited | Financial services | 2017 |
| BSH Ventures Limited | Wholesale & retail | 2023 |
| BTB (GRP) Limited | Manufacturing | 2011 |
| BTB Brew Technology (UK) Limited | Manufacturing | 2003 |
| BTS Commercials Ltd | Administrative & support | 2023 |
| Buchanan Construction (UK) Ltd | Real estate | 2020 |
| Bucur Trans Ltd | Transport & logistics | 2016 |
| Budby Antiques Limited | Wholesale & retail | 2016 |
| Buildzone DPN Ltd | Construction | 2023 |
| Buns N Roses Limited | Hospitality | 2025 |
| Burgess Holdings Limited | Financial services | 2016 |
| Burlington Bicycle Company Limited | Extraterritorial | 2016 |
| Burning Aurora Limited | Financial services | 2021 |
| Burrell's Estate Agency Ltd | Real estate | 2013 |
| Businesslike Services Limited | Professional & scientific | 2019 |
| BW Screeding Limited | Construction | 2019 |
| C & K Collective Ltd | Other services | 2025 |
| C I L Steeltech Limited | Financial services | 1994 |
| C J Hind Developments Ltd | Real estate | 2026 |
| C J Hind Property Ltd | Real estate | 2021 |
| C K Wright Access & Service Solutions Limited | Professional & scientific | 2025 |
| C M Joinery Contractors Limited | Construction | 2023 |
| C MAY Family Limited | Real estate | 2018 |
| C MAY Investments Limited | Real estate | 2020 |
| C P Asset Management Limited | Administrative & support | 2004 |
| C S Site Management Ltd | Construction | 2022 |
| C Wilson Property Investments Limited | Real estate | 2022 |
| C. White Plant Hire Limited | | 1994 |
| C.A.T Commercial Developments Limited | Construction | 2024 |
| C.W Waddington Properties Ltd | Real estate | 2018 |
| C.W. Moxon Limited | Transport & logistics | 1964 |
| C.W.Waddington,Limited | Wholesale & retail | 1943 |
| C2B Media Ltd | Information & communication | 2000 |
| Cabin Hill Plant Limited | Administrative & support | 2013 |
| Cachet (UK) Limited | Wholesale & retail | 1998 |
| Cafe X Jennys Limited | Hospitality | 2019 |
| Calvert Property Group Limited | Real estate | 2024 |
| CAM Beauty Ltd | Other services | 2024 |
| CAM Creative Media Limited | Information & communication | 2023 |
| Camm Electrical Limited | Construction | 2023 |
| Camm Plastering Contractors Limited | Construction | 2022 |
| Canem Ferox Ltd | Extraterritorial | 2021 |
| Canton Garden 888 Ltd | Hospitality | 2023 |
| Car Shine Detailing Ltd | Manufacturing | 2017 |
| Caravan Retreats Limited | Professional & scientific | 2023 |
| Carbon OIL Renewables Ltd | Manufacturing | 2024 |
| Care & Care Limited | Wholesale & retail | 2012 |
| Care Ahead Limited | Health & social care | 2021 |
| Care Companions Healthcare Limited | Health & social care | 2001 |
| Care Driven Agency Ltd | Health & social care | 2019 |
| Caribbean Occasions Ltd | Hospitality | 2017 |
| CARING4LINCOLN Ltd | Administrative & support | 2025 |
| Carlton Autos Limited | Wholesale & retail | 2000 |
| Carlton Construction Ltd | Construction | 2024 |