| Begum Pizza Ltd | Hospitality | 2025 |
| Bella G Estates Ltd | Real estate | 2024 |
| Bella Kitchens Ltd | Wholesale & retail | 2020 |
| BEN Byrom Ltd | Professional & scientific | 2019 |
| Berkay Ltd | Administrative & support | 2019 |
| Bernard Owen Limited | Real estate | 2018 |
| Berrington Hall Marquee Limited | Other services | 2013 |
| Bespoke Packing Solution Ltd | Manufacturing | 2020 |
| BEST4PARTS Ltd | Wholesale & retail | 2026 |
| Better Bodies Westgate Ltd | Arts & recreation | 2023 |
| Beulah Equities Limited | Health & social care | 2026 |
| Beyond the Lock Limited | Arts & recreation | 2025 |
| Beyond the Motion Ltd | Information & communication | 2017 |
| BG Urban Developments & Landscaping Ltd | Construction | 2026 |
| BH Corporation Ltd | Hospitality | 2022 |
| Bibby Commercials Limited | Manufacturing | 2003 |
| Bienko Logistics Ltd | Transport & logistics | 2019 |
| Bikemarshals Group Ltd | Extraterritorial | 2018 |
| Bioresonance Therapeutics Limited | Other services | 2023 |
| Birchwood Property Group Limited | Real estate | 2021 |
| Birley Hill Limited | Construction | 2021 |
| Birleywood Store Ltd | Wholesale & retail | 2023 |
| Birleywood UB Ltd | Wholesale & retail | 2017 |
| Black Door Developments Limited | Real estate | 2014 |
| Blackacre Newco 1 Limited | Financial services | 2025 |
| Blacksixty Star Limited | Wholesale & retail | 2021 |
| Blackstar Handling Systems Ltd | Administrative & support | 2002 |
| Blaguegate Holdings Limited | Financial services | 2024 |
| Blaguegate Limited | Extraterritorial | 2015 |
| Bloeien Limited | Wholesale & retail | 2024 |
| Bloohm Home & Property Services Ltd | Real estate | 2024 |
| BLU Building & Maintenance Limited | Construction | 2024 |
| Bluebird Refrigeration & Air Conditioning Limited | Manufacturing | 2011 |
| Bluefin Management Ltd | Real estate | 2024 |
| Bluefin Management NW Ltd | Real estate | 2025 |
| Bluefin MGT Ltd | Real estate | 2025 |
| Bodega Holdings Ltd | Financial services | 2024 |
| Bojintrans Limited | Transport & logistics | 2024 |
| Bokstas Ltd | Construction | 2023 |
| Bondi Beds Ltd | Other services | 2023 |
| Bondix Print Ltd | Manufacturing | 2021 |
| Booming Performance Limited | Administrative & support | 2015 |
| BOOZE2YOU Ltd | Wholesale & retail | 2026 |
| Bowburn Management Limited | Real estate | 2008 |
| Boxof Ltd | Wholesale & retail | 2024 |
| Boychev Junior Ltd | Wholesale & retail | 2023 |
| Brandon Building and Construction Ltd | Construction | 2018 |
| Bravo Transport Ltd | Wholesale & retail | 2024 |
| Breeze Smiles Limited | Health & social care | 2016 |
| Brick & Base Construction Ltd | Extraterritorial | 2025 |
| Bridge Pound Ltd | Financial services | 2025 |
| Bright Beginnings Neighbourhood Nursery Initiative Ltd | Education | 2004 |
| Brighter Futures (NW) Ltd | Health & social care | 2023 |
| Brighter Futures Group Limited | Health & social care | 2023 |
| Brocksford Motors Limited | Wholesale & retail | 1983 |
| Bromley J a Ltd | Wholesale & retail | 2025 |
| Building Careers U.K. Services Limited | Administrative & support | 2011 |
| Building Careers UK Holdings Limited | Administrative & support | 2023 |
| Building Careers UK Limited | Administrative & support | 2007 |
| Building Green Limited | Construction | 2004 |
| Buildtech Ltd | Construction | 2023 |
| Buildtech Property Solutions Ltd | Real estate | 2024 |
| Bulkactivewear Ltd | Wholesale & retail | 2023 |
| Burgum Lifestyle Management Limited | Real estate | 2016 |
| Burscough Junior Football League Ltd | Arts & recreation | 2020 |
| Business Process Automation Services Ltd | Information & communication | 2023 |
| Byrom Property Ltd | Real estate | 2025 |
| C & B Roofing Limited | Construction | 2010 |
| C & E Consultancy Services Limited | Professional & scientific | 2020 |
| C E R Groundworks & Paving Ltd | Construction | 2015 |
| Cable House Properties Limited | Real estate | 2020 |
| Cable Mountain Ltd | Education | 2013 |
| Cain Roofing & Building Maintenance Limited | Construction | 2022 |
| Callum Henwood Estate Agents Ltd | Real estate | 2025 |
| Calmer Coaching Ltd | Information & communication | 2019 |
| Calmer YOU Ltd | Administrative & support | 2016 |
| Cambraco Travel Limited | Transport & logistics | 2008 |
| Cambrian Innovations Limited | Construction | 2014 |
| Cappeli Venetians & Blinds Ltd | Wholesale & retail | 2016 |
| Captrad Holdings Limited | Real estate | 2022 |
| Captrad Limited | Manufacturing | 1999 |
| Care Afloat Holdings Limited | Real estate | 2016 |
| Care Afloat Ltd. | Health & social care | 1991 |
| Careers Doctor Ltd | Education | 2022 |
| Carehours Limited | Information & communication | 2023 |
| Carl J Nash Electrical Ltd. | Construction | 2017 |
| Carla Berkers Consulting Limited | Information & communication | 2019 |
| Carmel Clinical Limited | Professional & scientific | 2022 |
| Carmunity Ltd | Information & communication | 2026 |
| Carpet Edging UK Limited | Construction | 2021 |
| Carrylift Group (Holdings) Limited | Manufacturing | 1998 |
| Carrylift Materials Handling Limited | Wholesale & retail | 1988 |
| Cartmill Mechanical Engineering Ltd | Professional & scientific | 2013 |
| Cash 4 Clothes Lancashire Ltd | Wholesale & retail | 2025 |
| Castle Enterprise Limited | Education | 2024 |
| Castlehey Engineering Services Ltd | Professional & scientific | 2012 |
| Catersparesuk Ltd | Wholesale & retail | 2020 |
| Cathgill Fabrics Ltd | Wholesale & retail | 2009 |
| Causer Property Ltd | Real estate | 2025 |
| CBD 2021 Ltd | Transport & logistics | 2021 |