| Building Dreams Materials Ltd | Manufacturing | 2025 |
| Building Management Systems Limited | Construction | 2021 |
| Bulk Bazaar Limited | Wholesale & retail | 2024 |
| Bullbassa Ltd | Professional & scientific | 2018 |
| Bulldog Flyers Limited | Transport & logistics | 2002 |
| Bullen UND Baeren Stiftung Ltd | Financial services | 2021 |
| Bumble & Bloom Childcare Limited | Health & social care | 2026 |
| Bunce Sheet Metal Work Services Ltd | Manufacturing | 2019 |
| Burginhall Developments Limited | Professional & scientific | 1995 |
| Burn Bright Films Ltd | Information & communication | 2025 |
| Burn Garage Limited | Wholesale & retail | 2024 |
| Burnden Real Estate Ltd | Real estate | 2012 |
| Burney Real Estate Ltd | Real estate | 2024 |
| Burnt Tree Holdings Limited | Professional & scientific | 2005 |
| Burnt Tree Vehicle Solutions Limited | Administrative & support | 2005 |
| Buruj Properties Ltd | Real estate | 2017 |
| BUS Properties Ltd | Real estate | 2021 |
| BUS Property Rental Ltd | Real estate | 2021 |
| Business Effect Academy Ltd | Education | 2024 |
| BVL Real Estate Ltd | Real estate | 2024 |
| C M Morris Services Ltd | Construction | 2021 |
| C P Properties Services Ltd | Real estate | 2025 |
| C W Collective Ltd | Wholesale & retail | 2026 |
| C&M Solid Investments Ltd | Real estate | 2025 |
| C&P Real Home Estate Ltd | Real estate | 2024 |
| C.G.D. Property Services Ltd | Real estate | 2025 |
| Cabana Property Investment Ltd | Financial services | 2021 |
| CAD Invest Ltd | Real estate | 2023 |
| Cafe DE Piccolo Ltd | Hospitality | 2025 |
| Cake Make Create With LIZ Limited | Manufacturing | 2023 |
| Cali Pro Limited | Information & communication | 2023 |
| Calla Landscapes Ltd | Administrative & support | 2022 |
| Camara Parks Ltd | Real estate | 2022 |
| Cambridge International Training Centre Ltd | Administrative & support | 2022 |
| Cameze Solutions Limited | Extraterritorial | 2012 |
| Campmoss Property Company Limited | Real estate | 1987 |
| Candn Property Management Ltd | Administrative & support | 2016 |
| Cannon House Hotel Limited | Hospitality | 2016 |
| Cape Media Ltd | Professional & scientific | 2026 |
| Capital Accommodation Ltd | Hospitality | 2023 |
| Capital Trace Heating Limited | Construction | 2021 |
| Car Washed Convenient Ltd | Administrative & support | 2025 |
| Carbis Bay Estates Holding Ltd | Financial services | 2026 |
| Cardiff Property Public Limited Company(The) | Real estate | 1886 |
| Cardinal Buses Engineering Ltd | Wholesale & retail | 2019 |
| Cardinal Buses Ltd | Transport & logistics | 2003 |
| Cardinal HC Ltd | Health & social care | 2006 |
| CARE4 Home Care Ltd | Health & social care | 2010 |
| Carefree Insulations Limited | Construction | 2016 |
| Caremix Ltd | Administrative & support | 2022 |
| Caretech Partners Limited | Professional & scientific | 2024 |
| Carglass (UK) Limited | Extraterritorial | 1975 |
| Caribay Properties Ltd | Real estate | 2024 |
| Carlham Ltd | Wholesale & retail | 2020 |
| Carter & Shields Hair & Retail Services Ltd | Other services | 2024 |
| Carter Research Limited | Professional & scientific | 2025 |
| Casa Laya Ltd | Real estate | 2025 |
| Casa Parisi Limited | Construction | 2010 |
| Caspan Limited | Construction | 2012 |
| Caspary Ltd | Hospitality | 2019 |
| Castle Contracts (UK) Limited | Wholesale & retail | 1994 |
| Castle Investments (Sussex) Limited | Real estate | 2003 |
| Castlerosse Media Ltd | Professional & scientific | 2026 |
| Castori Estate Ltd | Real estate | 2022 |
| Castori Properties Ltd | Financial services | 2020 |
| Catalyse Coaching Ltd | Professional & scientific | 2019 |
| Cater Guard Ltd | Manufacturing | 2025 |
| CBA International Ltd | Administrative & support | 2017 |
| CBM Roofing Ltd | Construction | 2023 |
| CBN Expert Limited | Information & communication | 2019 |
| Cdfapps Limited | Information & communication | 2025 |
| Cdfw Limited | Wholesale & retail | 2023 |
| CDG Construction London Ltd | Construction | 2025 |
| Cedyr Limited | Real estate | 2021 |
| Celebrabis Limited | Wholesale & retail | 2014 |
| Celta Development Ltd | Extraterritorial | 2021 |
| Cementing Sans Frontieres Ltd | Professional & scientific | 2019 |
| Centaurus Media Ltd | Information & communication | 2020 |
| Centium Homes UK Ltd | Real estate | 2019 |
| Centrynex Cybersecurity Limited | Information & communication | 2024 |
| Certax Accounting (Windsor) Limited | Professional & scientific | 2003 |
| Cerwyn Properties Ltd | Real estate | 2024 |
| CG Top Houzing Ltd | Real estate | 2021 |
| Change Agitators Ltd | Professional & scientific | 2017 |
| Charalle Legal Recruitment Limited | Administrative & support | 2012 |
| Chariot Motors Ltd | Wholesale & retail | 2023 |
| Charlie Travelling Limited | Transport & logistics | 2017 |
| Charlie's Angels Property Ltd | Real estate | 2024 |
| Charliving Ltd | Real estate | 2024 |
| Charlotteville Cycling Club Limited | Arts & recreation | 2026 |
| Charmyworld Ltd | Wholesale & retail | 2024 |
| Charrette Ltd | Real estate | 2022 |
| CHD Housing Ltd | Real estate | 2026 |
| Cheadle Lakeside Care Home Limited | Health & social care | 2025 |
| Cheap Wholesale Limited | Wholesale & retail | 2024 |
| Cheeky Chicken and Grill Limited | Wholesale & retail | 2019 |
| Chefs on Location Ltd | Hospitality | 2000 |
| Chelsmore Properties Limited | Construction | 2005 |
| Chemidex Generics Limited | Wholesale & retail | 1999 |
| Chemidex Pharma Limited | Manufacturing | 1982 |