| Cube Housing Ltd | Real estate | 2023 |
| Cube Housing Solutions Ltd | Other services | 2020 |
| Cube Investments Group Ltd | Manufacturing | 2015 |
| Cube Removal Company Limited | Transport & logistics | 2016 |
| Cube Security & Facilities Ltd | Administrative & support | 2025 |
| Cubeone Digital Ltd | Professional & scientific | 2022 |
| Cubic Housing Ltd | Hospitality | 2020 |
| Cubic Space Holdings Limited | Real estate | 2019 |
| Cubic Space Management Ltd | Real estate | 2019 |
| Cubic Sphere Solutions Limited | Information & communication | 2014 |
| Cubone Estate Ltd | Real estate | 2025 |
| Cubs Corner Ltd | Health & social care | 2023 |
| Cucina Rustica Limited | Hospitality | 2009 |
| Cuckoo B’Ham Ltd | Hospitality | 2019 |
| Cuckoo Wharf (Management) Limited | Real estate | 1994 |
| Cuckoo's Collection Ltd | Wholesale & retail | 2025 |
| Cucurico Ltd | Hospitality | 2024 |
| Cuddle Paws Ltd | Other services | 2024 |
| Cude Labs Ltd | Information & communication | 2023 |
| Cudmore & Cudmore Limited | Extraterritorial | 2018 |
| Cudmore Rental & Property Account Limited | Real estate | 2017 |
| CUE Media Limited | Information & communication | 2001 |
| Cuebreak Ltd | Real estate | 2025 |
| Cuedos Snooker Accessories Limited | Manufacturing | 2023 |
| Cuello Cuello Ltd | Information & communication | 2025 |
| Cuggini Car Valeting Limited | Other services | 2023 |
| Cuisance Consulting Limited | Professional & scientific | 2013 |
| Cuiv Properties Limited | Real estate | 2021 |
| CUK Management Limited | Information & communication | 1997 |
| Culfield Ltd | Wholesale & retail | 2004 |
| Culinary 18 Ltd | Hospitality | 2025 |
| Culinary Masters Ltd | Wholesale & retail | 2025 |
| Culinary Times Ltd | Professional & scientific | 2022 |
| Cullen Property Management Ltd | Construction | 2024 |
| Cullinan Construction Ltd | Construction | 2021 |
| Cullinan Developments Limited | Construction | 2018 |
| Cullinan Housing Ltd | Health & social care | 2026 |
| Cullinan Investments Limited | Real estate | 2002 |
| Culocums Ltd | Health & social care | 2023 |
| Culross Cambuslang Limited | Real estate | 2019 |
| Cult Altware Ltd | Wholesale & retail | 2026 |
| Cult International Limited | Professional & scientific | 2024 |
| Cult London Limited | Professional & scientific | 2012 |
| Cult UK Management Ltd | Professional & scientific | 2024 |
| Cultof.Com Limited | Information & communication | 2022 |
| CULTUR3 Limited | Arts & recreation | 2025 |
| Cultural Intelligence Agency CIC | Education | 2022 |
| Culture City Birmingham Ltd | Wholesale & retail | 2026 |
| Culture Collection Limited | Hospitality | 2024 |
| Culture Cooking Restaurant Ltd | Hospitality | 2023 |
| Culture Recruitment Group Holdings Limited | Administrative & support | 2023 |
| Culture Recruitment Limited | Administrative & support | 2017 |
| Culture Sourcer Ltd | Wholesale & retail | 2025 |
| Culturecentral | Other services | 2016 |
| Cultured Nosh Ltd | Hospitality | 2025 |
| Cultured&Co Ltd | Professional & scientific | 2025 |
| Cumberland Property Investments Limited | Real estate | 2020 |
| Cumbria Wholesale Limited | Wholesale & retail | 2020 |
| Cummings Content Design Ltd | Professional & scientific | 2022 |
| Cumulative Ltd | Public administration | 2020 |
| Cunha & Ribeiro Ltd | Education | 2022 |
| Cunney Construction Limited | Construction | 2012 |
| Cunningham Property Developers Ltd | Extraterritorial | 2026 |
| CUP Empty Asset Holdings Limited | Real estate | 2025 |
| CUP Trading Limited | Education | 2021 |
| Cupbanana Ltd | Information & communication | 2025 |
| Cupcake Advice Limited | Financial services | 2024 |
| Cupcakes Limited | Hospitality | 2025 |
| Cupel Built Environment Ltd | Professional & scientific | 2026 |
| Cuppa Chaii (Small Heath Birmingham) Ltd | Hospitality | 2024 |
| Cuppa Constructions Ltd | Construction | 2025 |
| Cuppa Jo’S Ltd | Hospitality | 2026 |
| Cups N Cravings Ltd | Hospitality | 2025 |
| Cura Care Adult Services Ltd | Health & social care | 2025 |
| Cura Property Services Ltd | Manufacturing | 2015 |
| Curacx Ltd | Professional & scientific | 2025 |
| Curated Avenue Ltd | Wholesale & retail | 2025 |
| Curating Connections Ltd | Professional & scientific | 2023 |
| Curb Appeal Garden Maintenance Limited | Administrative & support | 2021 |
| Curbside Collective Ltd | Hospitality | 2023 |
| Curds & Whey Cheese Limited | Wholesale & retail | 2019 |
| Cure Care Services Limited | Health & social care | 2024 |
| Cure Leukaemia | Health & social care | 2002 |
| Cure My Mobile Ltd | Information & communication | 2016 |
| Curehaus Foods Ltd | Manufacturing | 2025 |
| Curespherehealthcare Ltd | Wholesale & retail | 2025 |
| Curiosity AI Labs Ltd | Education | 2026 |
| Curiosity Approach Network Ltd | Wholesale & retail | 2017 |
| Curiosity Shop Limited(The) | Wholesale & retail | 1975 |
| Curious Creatures Ltd | Health & social care | 2022 |
| Curious House Design Limited | Information & communication | 2025 |
| Curious Transport Ltd | Transport & logistics | 2024 |
| Curium Solutions Ltd | Professional & scientific | 2008 |
| Curls and Coils Ltd | Wholesale & retail | 2024 |
| Curls&Kawaii Ltd | Wholesale & retail | 2019 |
| Curo Advisory Limited | Professional & scientific | 2025 |
| Currency Trading Ltd | Education | 2020 |
| Current Craft Electrical Ltd | Construction | 2024 |
| Current Tech Group Limited | Construction | 2026 |
| Curricula Solutions Ltd | Education | 2020 |