| Busy Bees Cleaning Services Ltd | Administrative & support | 2025 |
| Buxton Specsavers Hearcare Limited | Wholesale & retail | 2018 |
| Buxton Specsavers Limited | Wholesale & retail | 1996 |
| Bvcv Ltd | Transport & logistics | 2025 |
| BVS Car Sales Limited | Wholesale & retail | 2017 |
| BW Kitchen & Bathroom Fitters Limited | Construction | 2022 |
| BWR Plant and Commercials Limited | Administrative & support | 2011 |
| BWS (Southern) Ltd | Professional & scientific | 2025 |
| Bwseacat Limited | Manufacturing | 2004 |
| Bwseacat Mouldings Limited | Manufacturing | 2004 |
| Bwt-Southern Limited | Construction | 2000 |
| BWW Consulting Ltd | Professional & scientific | 2023 |
| BY Devon Rose Ltd | Other services | 2023 |
| BY Erin Louise Beauty Ltd | Other services | 2025 |
| BY Nordic Talents Ltd | Administrative & support | 2021 |
| BY Ross Garcia Limited | Other services | 2019 |
| Bybrook Specsavers Limited | Wholesale & retail | 2018 |
| Byngs Properties Limited | Real estate | 2014 |
| Byres Road Specsavers Limited | Wholesale & retail | 2007 |
| Byres Road Visionplus Limited | Wholesale & retail | 2007 |
| Bytehub Ltd | Extraterritorial | 2019 |
| Byworth Advisors Limited | Professional & scientific | 2025 |
| C & C Brickwork Limited | Construction | 2007 |
| C & C Industrial Group Limited | Manufacturing | 2010 |
| C & P T Enterprises Limited | Professional & scientific | 2024 |
| C & R Brickwork Limited | Construction | 2017 |
| C & W Property Limited | Hospitality | 2003 |
| C C (Meridians House) Ltd | Real estate | 2015 |
| C C (Stretton) Ltd | Real estate | 2014 |
| C Data Marine Limited | Transport & logistics | 1986 |
| C F Electronics Limited | Manufacturing | 2002 |
| C Fitzsimmons Limited | Financial services | 2006 |
| C G Portchester Limited | Real estate | 2002 |
| C L Mortgages and Protection Limited | Financial services | 2019 |
| C R Creative Limited | Information & communication | 2008 |
| C T Mccann Contractors Ltd | Construction | 2021 |
| C&J Murdoch Limited | Professional & scientific | 2017 |
| C&S Import Export Limited | Extraterritorial | 2014 |
| C-Front Limited | Real estate | 2006 |
| C-Garuk Ltd | Wholesale & retail | 2025 |
| C-Quip Limited | Other services | 1988 |
| C. J. Hoare Limited | Construction | 1994 |
| C.A Supply Co. Ltd | Wholesale & retail | 2026 |
| C.D. Hurley Management Services Limited | Professional & scientific | 2000 |
| C.G.H. Holdings Limited | Administrative & support | 1987 |
| C.L Locum VET Ltd | Professional & scientific | 2024 |
| C.N.A. Ruff Limited | Wholesale & retail | 1994 |
| C.Scales Consulting Ltd | Professional & scientific | 2016 |
| C.Scott & Co Investment Ltd | Real estate | 2023 |
| C.Scott & Co Lettings Ltd | Households | 2024 |
| C.Scott & Co Limited | Real estate | 2019 |
| C2 Enterprise Ltd | Wholesale & retail | 2024 |
| C2 Ltd | Administrative & support | 2010 |
| C4U Online Limited | Health & social care | 2026 |
| C5ISR Consulting Limited | Information & communication | 2022 |
| CA Testing Solutions Limited | Information & communication | 2014 |
| CAB Glass (Bordon) Limited | Manufacturing | 1989 |
| Cablestream Ltd | Information & communication | 2006 |
| Cabmatch Ltd | Administrative & support | 2026 |
| Cadaema Consulting Services Ltd | Professional & scientific | 2019 |
| Cade Directories Limited | Administrative & support | 2006 |
| Cadet Transport Services Ltd | Construction | 2017 |
| Cadillac Fairview Europe RE Limited | Financial services | 2020 |
| Cadramaisoso Limited | Transport & logistics | 2025 |
| Caernarfon Specsavers Hearcare Limited | Wholesale & retail | 2024 |
| Caernarfon Specsavers Limited | Wholesale & retail | 2009 |
| Caernarfon Visionplus Limited | Wholesale & retail | 2009 |
| Caerphilly Specsavers Limited | Wholesale & retail | 1993 |
| Caerphilly Visionplus Limited | Wholesale & retail | 1993 |
| Cafe Corporation Limited | Hospitality | 1993 |
| Cafe Earth Ltd | Hospitality | 2023 |
| Calcot Specsavers Limited | Wholesale & retail | 2017 |
| Caldera Fire & Security Limited | Administrative & support | 2005 |
| Caldera FS Limited | Construction | 2017 |
| Caldera Heat Batteries Limited | Manufacturing | 2017 |
| Calla Lily Property Ltd | Real estate | 2025 |
| Callard Industries Ltd | Wholesale & retail | 2022 |
| Calmness in Mind Ltd | Health & social care | 2023 |
| Calmore Industrial Limited | Wholesale & retail | 2013 |
| Calvin Force Ltd | Administrative & support | 2023 |
| CAM Structures Ltd | Construction | 2026 |
| Camber Property Limited | Financial services | 2020 |
| Camber Sounds Ltd | Arts & recreation | 2022 |
| Camberley Specsavers Hearcare Limited | Wholesale & retail | 2024 |
| Camberley Specsavers Limited | Wholesale & retail | 1992 |
| Camberley Visionplus Limited | Wholesale & retail | 1992 |
| Camberwell Holdings Ltd | Real estate | 2024 |
| Camborne Specsavers Hearcare Limited | Wholesale & retail | 2005 |
| Cambridge Fitzroy Street Visionplus Limited | Wholesale & retail | 1999 |
| Cambridge Research Park Management Company Limited | Real estate | 2005 |
| Cambridge Specsavers Hearcare Limited | Wholesale & retail | 2005 |
| Cambridge Specsavers Limited | Wholesale & retail | 1988 |
| Cambridge Visionplus Limited | Wholesale & retail | 1999 |
| Camden Town Specsavers Limited | Wholesale & retail | 2000 |
| Camel Creek Capital Limited | Financial services | 2015 |
| Cameron Toll Specsavers Limited | Wholesale & retail | 2011 |
| Cameron-Davies Hearing Care Ltd | Wholesale & retail | 2018 |
| Cameron-Rose Limited | Agriculture & fishing | 1976 |
| Camley Street Operations Limited | Real estate | 2021 |
| Camrose and Mays Properties Ltd | Real estate | 2024 |