| CALL24 AI Ltd | Information & communication | 2025 |
| Callaghan Property Solutions Limited | Real estate | 2025 |
| Callan Property Ltd | Real estate | 2019 |
| Callbuy Limited | Real estate | 1999 |
| Callerman Enterprises Limited | Transport & logistics | 2014 |
| Callidus Resolution Limited | Administrative & support | 2016 |
| Calliope Inigo Estates Limited | Wholesale & retail | 2017 |
| Callisto Marine Chandlers Ltd | Wholesale & retail | 2024 |
| Callistus Developments Limited | Professional & scientific | 2013 |
| Callstar Limited | Real estate | 1998 |
| Calltime Limited | | 1983 |
| Callum Gorniak Limited | Arts & recreation | 2026 |
| Calluna Audio Ltd | Information & communication | 2020 |
| Calm & Connected CIC | Education | 2022 |
| Calm Business Services Limited | Professional & scientific | 2025 |
| Calm Down Calm Down Limited | Other services | 2014 |
| Calm Homecare Ltd | Health & social care | 2021 |
| Calm Lane Ltd | Health & social care | 2024 |
| Calm Living Ltd | Wholesale & retail | 2025 |
| Calm Retreats Ltd | Hospitality | 2024 |
| Calm Shores Limited | Real estate | 2025 |
| Calmati Cafe Ltd | Hospitality | 2025 |
| Calmcloud Applications Limited | Information & communication | 2023 |
| Calmliving Care Ltd | Administrative & support | 2023 |
| Calmliving Healthcare Limited | Administrative & support | 2023 |
| Calmness Ltd. | Health & social care | 2011 |
| Calore Homes Ltd | Construction | 2023 |
| Calpropshaw Limited | Real estate | 2021 |
| Calsands 200 Limited | Other services | 2020 |
| Calsite Company Limited | Financial services | 2012 |
| Calsite Holdings Limited | Financial services | 2021 |
| Calsoft UK Limited | Information & communication | 2022 |
| Calssic Care UK Ltd. | Wholesale & retail | 2019 |
| Calstarr Ltd | Wholesale & retail | 2019 |
| Calthatame Limited | Real estate | 2015 |
| Caltons Secure Caravan Storage Ltd | Transport & logistics | 2008 |
| Calum Moore Consulting Limited | Information & communication | 2014 |
| Calvary Estates Ltd | Real estate | 2024 |
| Calverix Ltd | Wholesale & retail | 2026 |
| Calvin Sport Group UK Ltd | Professional & scientific | 2019 |
| Calvin Sports Management Group UK Ltd | Arts & recreation | 2021 |
| Calviro Ltd | Wholesale & retail | 2026 |
| Calvita Limited | Real estate | 2024 |
| Calwood Homes Ltd | Real estate | 2025 |
| Calypsa Studio Limited | Wholesale & retail | 2025 |
| Calypso Alliance LLP | | 2019 |
| Calzak Lighting Limited | Information & communication | 2022 |
| Calzone King Ltd | Wholesale & retail | 2023 |
| CAM Accounting Limited | Professional & scientific | 2011 |
| CAM Baber Ltd | Other services | 2025 |
| CAM Createz Ltd | Wholesale & retail | 2023 |
| CAM Estates | Other services | 2014 |
| CAM Northwest Ltd | Construction | 1994 |
| CAM Productions Limited | Information & communication | 2019 |
| Cama Concepts Limited | Information & communication | 2015 |
| Cama Investments Limited | Financial services | 2021 |
| Camal Enterprises Limited | Wholesale & retail | 2009 |
| Camber Publishing Limited | Information & communication | 1964 |
| Cambria Portfolio Nominee 1 Limited | Extraterritorial | 2018 |
| Cambrian Associates Limited | Financial services | 1990 |
| Cambrian Funfair Limited | Arts & recreation | 2019 |
| Cambridge Arts Group Ltd | Wholesale & retail | 2021 |
| Cambridge Conservatories &Construction Ltd | Construction | 2025 |
| Cambridge Event Bars Limited | Hospitality | 2014 |
| Cambridge Graphene Ltd. | Professional & scientific | 2014 |
| Cambridge Green Solutions Limited | Administrative & support | 2016 |
| Cambridge Publications Limited | Professional & scientific | 1995 |
| Cambridge Street Management Limited | Households | 2015 |
| Cambridgeshire Classic Cars Ltd | Wholesale & retail | 2014 |
| Camco Broker Services Limited | Financial services | 2023 |
| Camco Finance 1 Limited | Financial services | 2024 |
| Camco Finance Ltd | Financial services | 2020 |
| Camco Group Limited | Financial services | 2023 |
| Camco Loanco Limited | Financial services | 2024 |
| Camcrew Limited | Information & communication | 2011 |
| Camdan Construction Limited | | 2011 |
| Camden and Co Home Limited | Wholesale & retail | 2022 |
| Camden House Property Ltd | Real estate | 2016 |
| Camel Events Ltd | Other services | 2024 |
| Camel Partners Ltd | Real estate | 2025 |
| Camellia Beauty and Spa Ltd | Other services | 2024 |
| Cameo Enterprises Limited | Wholesale & retail | 2009 |
| Cameo Rose Limited | Wholesale & retail | 2020 |
| Cameolord Limited | Wholesale & retail | 1983 |
| Camera Crib Ltd. | Wholesale & retail | 2019 |
| Camera Monkey Ltd | Information & communication | 2014 |
| Cameron Chase (Commercial Property) Limited | Real estate | 2006 |
| Cameron Corr Ltd | Other services | 2018 |
| Cameron Distribution Ltd | Wholesale & retail | 2018 |
| Cameron KAY Annie Ltd | Financial services | 2015 |
| CAMERON79 Limited | Construction | 2011 |
| Camerons (BMS) Limited | Construction | 2003 |
| Camerons Residential Limited | Construction | 2011 |
| Camilla Australia PTY Ltd | Wholesale & retail | 2026 |
| Camilla Duncan Consulting Ltd | Professional & scientific | 2024 |
| Camilla Rhuda Ltd | Information & communication | 2026 |
| Camille Simon Holdings Limited | Extraterritorial | 1972 |
| Camille Simon,Limited | Extraterritorial | 1898 |
| Camilleri Developments Limited | | 2006 |
| Camino Properties Ltd | Real estate | 2025 |