| Business Consolidating Services Limited | Information & communication | 1981 |
| Business Intelligent IQ Ltd | Information & communication | 2013 |
| Business Matters (Somerset) Ltd | Administrative & support | 2019 |
| Buss IT Solutions Limited | Information & communication | 2024 |
| Butco Electrical Ltd | Construction | 2015 |
| Butco Heating Limited | Construction | 1973 |
| Butlers Fine Foods Limited | Hospitality | 2002 |
| Butterfly Effect Ltd | Professional & scientific | 2022 |
| Buttons and Buckles Ltd | Wholesale & retail | 2025 |
| Buy IT NOW (UK) Ltd | Wholesale & retail | 2014 |
| Buybyesupply Limited | Wholesale & retail | 2025 |
| BWS Rentals Ltd | Hospitality | 2025 |
| BY Eryn Limited | Wholesale & retail | 2019 |
| Byford Healthcare Limited | Health & social care | 2019 |
| Byford Homes Limited | Real estate | 2017 |
| Bykaytonjl Limited | Other services | 2024 |
| Bylukewright Limited | Professional & scientific | 2022 |
| Byrne Decorators Ltd | Construction | 2004 |
| Byrosíq Ltd | Manufacturing | 2025 |
| Byshan Limited | Other services | 2025 |
| Bytesize Software Solutions Ltd | Information & communication | 2011 |
| Bythems Investments Limited | Real estate | 1959 |
| Bûbl Ltd | Health & social care | 2023 |
| B’S House Limited | Hospitality | 2025 |
| C & D Residential Ltd | Real estate | 2025 |
| C & M Global Ltd | Administrative & support | 2015 |
| C & T Locksmiths Limited | Manufacturing | 2003 |
| C Andre Properties Limited | Real estate | 2022 |
| C B Designs Limited | Professional & scientific | 1992 |
| C BLU Properties Limited | Wholesale & retail | 2023 |
| C Clad Ltd | Construction | 2018 |
| C D (Europe) Ltd | Wholesale & retail | 2007 |
| C Hunter Holdings Limited | Construction | 2001 |
| C I Electrical Projects Limited | Manufacturing | 2013 |
| C J N Property Group Ltd | Real estate | 2025 |
| C K Childcare Limited | Health & social care | 2010 |
| C Keye Limited | Real estate | 2020 |
| C Logistics Services Ltd | Professional & scientific | 2025 |
| C R M.O.T. Centre Limited | Administrative & support | 2013 |
| C V Interiors Ltd | Construction | 2020 |
| C&M Homes Ltd | Construction | 2011 |
| C&S Carpentry and Tiling Ltd | Construction | 2025 |
| C&S Interior Services Limited | Construction | 2022 |
| C-Mac Reinforcements Limited | Construction | 2004 |
| C. P. Gregory & Associates Limited | Administrative & support | 2002 |
| C. Powell Funeral Service Limited | Extraterritorial | 1978 |
| C.B Electrical Installations Ltd | Construction | 2022 |
| C.B.R. Contractors Limited | Construction | 2010 |
| C.G.B. Contracting Services Limited | Administrative & support | 2002 |
| C.S. North Ltd | Extraterritorial | 2008 |
| C.W. Architectural Interiors Limited | Manufacturing | 1999 |
| C21 Sutton Coldfield (Properties) Limited | Real estate | 2019 |
| C21 Sutton Coldfield Limited | Real estate | 2018 |
| C7 Ventures Limited | Financial services | 2022 |
| CA Town Planning Ltd | Professional & scientific | 2025 |
| Cabal Group Limited | Information & communication | 2002 |
| Cabena Eyecare Ltd | Wholesale & retail | 2024 |
| Caboodle Financial Services Ltd | Financial services | 2012 |
| CAD Creative Limited | Professional & scientific | 2009 |
| Cadenza Sports Group Limited | Professional & scientific | 2024 |
| Cadman HR Limited | Administrative & support | 2014 |
| Cafe Ceramica Limited | Arts & recreation | 2003 |
| Cafe Whitmore Limited | Hospitality | 2024 |
| Cafelicious Sutton Ltd | Hospitality | 2024 |
| Cafetogo Limited | Hospitality | 2023 |
| Cafiend Limited | Hospitality | 2025 |
| Cailtardion Ltd | Administrative & support | 2021 |
| Caines Coolrunnings Ltd | Transport & logistics | 2024 |
| Cair Services Ltd | Health & social care | 2019 |
| Calapoint Limited | Health & social care | 2024 |
| Caldera Capital Finance Limited | Financial services | 2013 |
| Calhan Design Ltd | Professional & scientific | 2014 |
| Calido Limited | Professional & scientific | 2003 |
| Call First Cleaning Limited | Other services | 2011 |
| Callias Capital (Alfred ST) Limited | Real estate | 2021 |
| Callias Capital Limited | Real estate | 2019 |
| Calm Catering Ltd | Manufacturing | 2024 |
| Caltain VR Ltd | Information & communication | 2017 |
| Caltec Environmental Services Ltd | Administrative & support | 2011 |
| CAM Distribution Services Limited | Transport & logistics | 2016 |
| Caman Land Ltd | Real estate | 2020 |
| CAMBIO17 Services Limited | Professional & scientific | 2017 |
| Cambrian Estate Management Ltd | Real estate | 2025 |
| Cambridge Capital Group Ltd | Real estate | 2026 |
| Camby Limited | Professional & scientific | 2021 |
| Camland Consulting Limited | Administrative & support | 2011 |
| Camland Developments Ltd | Real estate | 2008 |
| Camomile Homes Limited | Real estate | 2022 |
| CAMROC26 Limited | Professional & scientific | 2026 |
| Canary Solution Ltd | Information & communication | 2024 |
| Cand Capital Limited | Financial services | 2017 |
| Candid Communications Ltd | Professional & scientific | 2025 |
| Candidate Clarity Limited | Professional & scientific | 2016 |
| Candleglow Limited | Administrative & support | 2023 |
| Candy Assets Limited | Real estate | 2021 |
| Candy Chaos Limited | Wholesale & retail | 2026 |
| Candymix Limited | Manufacturing | 2015 |
| Cannock Fireplaces & Stove Centre Ltd | Wholesale & retail | 2015 |
| Canvi Limited | Professional & scientific | 2013 |
| Canwell Caravans Limited | Real estate | 1989 |