| Beech House Limited | Health & social care | 2020 |
| Beech House Property Limited | Real estate | 2025 |
| Beecroft Engineering Services Limited | Professional & scientific | 2011 |
| Bella Rose Enterprises Ltd | Administrative & support | 2019 |
| Bermuda Falls Golf Limited | Arts & recreation | 2024 |
| Bespoke Financial Investments Ltd | Real estate | 2026 |
| Bespoke Living and Healthcare Ltd | Health & social care | 2025 |
| Better Security Ltd | Administrative & support | 2019 |
| Beverley GIN Festival Limited | Hospitality | 2019 |
| Beverley Storage Ltd | Transport & logistics | 2023 |
| Biervliet Holdings Limited | Real estate | 2025 |
| Billy Bobs Events Ltd | Hospitality | 2023 |
| Biocel Limited | Professional & scientific | 2017 |
| Blackcherry Limited | Real estate | 2023 |
| Blanchouse Ltd | Wholesale & retail | 2022 |
| Blinds Workshop Ltd | Manufacturing | 2011 |
| Blonde Hair Limited | Other services | 2012 |
| Blue Kangaroo Play Limited | Arts & recreation | 2008 |
| BNL Haulage Ltd | Transport & logistics | 2025 |
| Borderless Consultancy Limited | Information & communication | 2021 |
| Boxall Contracting Ltd | Construction | 2008 |
| Bradavon Limited | Administrative & support | 2022 |
| Bradavon Services Limited | Professional & scientific | 2024 |
| Bradford Hall Care Limited | Health & social care | 2026 |
| Braffords Limited | Real estate | 2012 |
| Briadvic Limited | Professional & scientific | 2015 |
| Bridge SLT Ltd | Education | 2013 |
| Brocot Ltd | Financial services | 2023 |
| Brooker Commercial Property Ltd | Real estate | 2022 |
| Brooks Plumbing Limited | Construction | 2023 |
| BRW Motorsport Ltd | Wholesale & retail | 2019 |
| Build Impact Consulting Limited | Professional & scientific | 2024 |
| BUILT4LIFE Total Immersion Ltd | Wholesale & retail | 2023 |
| Burge Property Ltd | Real estate | 2025 |
| Burghley Care Devco Limited | Financial services | 2025 |
| Burghley Care Opco 1 Limited | Financial services | 2025 |
| Burghley Care Opco Group Limited | Financial services | 2025 |
| Burgin Property Investments Ltd | Real estate | 2017 |
| Burstwick Freight Services Limited | Transport & logistics | 1981 |
| Butterfly Therapies Limited | Other services | 2019 |
| BV Holdings 1 Limited | Other services | 2025 |
| Bybuild Ltd | Construction | 2025 |
| C 2 Compliance Ltd | Professional & scientific | 2016 |
| C and N General Trading Limited | Wholesale & retail | 2024 |
| C Baker Ltd | Other services | 2026 |
| C J Cladding Limited | Construction | 2003 |
| C S Roofing Limited | Construction | 2003 |
| C T S Process Limited | Manufacturing | 2012 |
| C&M Holdings Hull Limited | Real estate | 2017 |
| C&N Properties Hull Ltd | Real estate | 2025 |
| Cadence Community CIC | Arts & recreation | 2026 |
| Cadence Run Shop Ltd | Wholesale & retail | 2026 |
| CAI Consulting Ltd | Professional & scientific | 2019 |
| CAI Management Limited | Professional & scientific | 2016 |
| CAL JK Ltd | Wholesale & retail | 2025 |
| Canine Care Academy Ltd | Other services | 2026 |
| Canyudo Ltd | Information & communication | 2015 |
| Capricorn Cooling Services Ltd | Construction | 2021 |
| Caravan and Holiday Home Services Limited | Manufacturing | 2002 |
| Carbon Cladding Group Limited | Construction | 2023 |
| Carden Projects Limited | Construction | 2025 |
| Cardmancams Collectables Limited | Wholesale & retail | 2025 |
| Carmenta Clinical Services Ltd | Health & social care | 2025 |
| Carmenta Health Ltd | Health & social care | 2022 |
| Cass Bar Ltd | Hospitality | 2025 |
| Catchcam Technologies Ltd | Manufacturing | 2024 |
| Cavill Place Management Company Limited | Households | 2022 |
| CC Driver Hire Limited | Transport & logistics | 2025 |
| Ccps Solutions Limited | Transport & logistics | 2017 |
| Cedar Estates Management Company Limited | Real estate | 2016 |
| Cedarwood Engineering Limited | Professional & scientific | 2024 |
| Centurion Commercial Ltd | Real estate | 2025 |
| Chacra Coffee Limited | Wholesale & retail | 2023 |
| Charella Limited | Health & social care | 2024 |
| Cheryl Limited | Real estate | 2022 |
| Chestnut Leisure Homes Limited | Real estate | 1998 |
| Chillipepper Freehold Management Limited | Real estate | 2015 |
| Christian Brodie Hair Limited | Other services | 2013 |
| Christo Enterprises Ltd | Wholesale & retail | 2006 |
| CJE Group Limited | Administrative & support | 2018 |
| CJH Financial Ltd | Professional & scientific | 2020 |
| CJS Display Ltd | Wholesale & retail | 2020 |
| CK Architectural Midlands Ltd | Professional & scientific | 2024 |
| CK Architectural Yorkshire Ltd | Administrative & support | 2023 |
| CK Building Solutions (UK) Limited | Construction | 2026 |
| CK Wind Ltd | Manufacturing | 2019 |
| CKA South West Limited | Professional & scientific | 2017 |
| Clark and Daniel Limited | Administrative & support | 2017 |
| Clarke & Co (Cottingham) Ltd | Hospitality | 2023 |
| Classical GAS Limited | Construction | 2004 |
| Clear WAX Removal Ltd | Health & social care | 2023 |
| Cliff Court (Hornsea) Management Co Ltd | Real estate | 2021 |
| Clinical Intuition Limited | Professional & scientific | 2025 |
| Cloud Kitchens Limited | Construction | 2019 |
| Cloudnet Hosting Ltd | Information & communication | 2024 |
| Clucas Method of Entry Limited | Manufacturing | 1974 |
| CMF Construction Hull Ltd | Construction | 2022 |
| CMF Maintenance Hull Ltd | Construction | 2022 |
| Cobot Coach Ltd | Education | 2026 |
| Company of Gardeners Limited | Administrative & support | 2007 |