| Careworld Enterprises Limited | Other services | 2022 |
| Carfixe Ltd | Wholesale & retail | 2024 |
| Carhandwash Ltd | Administrative & support | 2026 |
| Caria Homes Limited | Real estate | 2026 |
| Caribbean Gold Limited | Wholesale & retail | 2015 |
| Caring Arms Together Ltd | Health & social care | 2020 |
| Caring AZ 4 UK Ltd | Health & social care | 2023 |
| Caring Hands East London Ltd | Health & social care | 2016 |
| Caring Hub Ltd | Health & social care | 2024 |
| Caring Persons UK Limited | Hospitality | 2021 |
| Carino Cloud Technologies Limited | Information & communication | 2013 |
| Carita Educatrice Limited | Professional & scientific | 2022 |
| Carkeyworld Limited | Wholesale & retail | 2021 |
| Carlisle Assets Limited | Financial services | 2018 |
| Carlos & Smyth's Construction Ltd | Construction | 2019 |
| Carltech Design and Build Ltd | Other services | 2022 |
| Carltech Ltd | Other services | 2010 |
| Carltech Plumbing Ltd | Wholesale & retail | 2018 |
| Carlton Group Developments Ltd | Real estate | 2010 |
| Carlton House Props Ltd | Real estate | 2019 |
| Carlton Properties ( Leigh ) Ltd | Real estate | 2013 |
| Carlton Properties Management Ltd | Real estate | 2018 |
| Carlton Vale NW6 Ltd | Real estate | 2024 |
| Carlyle FM Ltd | Professional & scientific | 2019 |
| Carmine Capital Ltd | Real estate | 2021 |
| Carmine Care Group Ltd | Health & social care | 2026 |
| Carmine Properties Ltd | Real estate | 2021 |
| Carmine Services Ltd | Construction | 2022 |
| Carney Consulting and Investigations Limited | Professional & scientific | 2019 |
| Carp Construct Limited | Construction | 2023 |
| Carp Project Ltd | Construction | 2024 |
| Carpath Petroleum Company Limited | Wholesale & retail | 2025 |
| Carpe Diem Associates Limited | Information & communication | 2010 |
| Carpe Tempus Ltd | Information & communication | 2019 |
| Carpe&Diem Ltd | Wholesale & retail | 2025 |
| Carpet Cleaner Crawley Ltd | Other services | 2025 |
| Carpet Express & Business Centre Ltd | Other services | 2012 |
| Carpet Express London Ltd | Other services | 2023 |
| Carpet Express Services Ltd | Wholesale & retail | 2009 |
| Carr 33 Limited | Real estate | 2024 |
| Carr Subs Limited | Hospitality | 2014 |
| Carraig Ltd | Construction | 2016 |
| Carrington Contractors Limited | Construction | 2022 |
| Carroll's Jewellery Limited | Wholesale & retail | 2007 |
| Carry Charm Ltd | Wholesale & retail | 2025 |
| Carryme Ltd | Wholesale & retail | 2023 |
| Cars Direct Ltd | Wholesale & retail | 2024 |
| Cars Master UK Limited | Transport & logistics | 2019 |
| Cars Spot Limited | Wholesale & retail | 2017 |
| Cars Under 3K Ltd | Other services | 2024 |
| Cars Zone Limited | Wholesale & retail | 2017 |
| CARS4CARS Ltd | Wholesale & retail | 2025 |
| Carsomfassel Ltd | Transport & logistics | 2019 |
| Carspa AFB Ltd | Other services | 2025 |
| Carspedition Ltd | Transport & logistics | 2021 |
| Cartastic UK Ltd | Wholesale & retail | 2018 |
| Cartel Portfolio LLP | | 2021 |
| Cartel Properties Ltd | Real estate | 2005 |
| Carter Clark Advisory Limited | Professional & scientific | 2017 |
| Carter Clark Limited | Professional & scientific | 2004 |
| Carter M Ltd | Professional & scientific | 2015 |
| Cartesian Logic Limited | Professional & scientific | 2016 |
| Carthago Capital Ltd. | Professional & scientific | 2006 |
| Carthago International Consulting Ltd | Information & communication | 2017 |
| Carthago Ltd | Financial services | 2016 |
| Carthago Value Invest Ukeig | | 2013 |
| Cartier Estates Ltd | Real estate | 2020 |
| Cartino Ltd | Wholesale & retail | 2025 |
| Cartley Limited | Wholesale & retail | 2025 |
| Cartnbuy Limited | Wholesale & retail | 2026 |
| Cartwheel International Limited | Financial services | 2014 |
| Cartwheel Properties Limited | Real estate | 2025 |
| Carvo Finance Ltd | Wholesale & retail | 2026 |
| Carz Express Limited | Wholesale & retail | 2020 |
| Carzova Ltd | Wholesale & retail | 2026 |
| CAS Crossways Limited | Wholesale & retail | 2025 |
| CAS Interiors Ltd | Construction | 2015 |
| CAS Jackson Road Limited | Wholesale & retail | 2025 |
| CAS P2U Limited | Health & social care | 2026 |
| CAS ST Johns Road Limited | Wholesale & retail | 2025 |
| Casa Bravir Ltd | Wholesale & retail | 2025 |
| Casa Cotton Limited | Wholesale & retail | 2025 |
| Casa Furniture Ltd | Wholesale & retail | 2026 |
| Casacandy Ltd | Real estate | 2025 |
| Casam Management Limited | Wholesale & retail | 2023 |
| Caselens Ltd | Information & communication | 2025 |
| Cash in Your Brick Ltd | Financial services | 2025 |
| Casiwan Consultancy Ltd | Administrative & support | 2023 |
| Casperling Ltd | Information & communication | 2013 |
| Caspian Bay Limited | Information & communication | 2023 |
| Caspian Holdings (UK) Ltd | Financial services | 2024 |
| Caspian Marketing Limited | Professional & scientific | 1995 |
| Caspian Property Management Ltd | Real estate | 2025 |
| Caspian School of Academics Ltd | Education | 2020 |
| Cassandra YAP Limited | Professional & scientific | 2010 |
| Casson Consulting (London) Limited | Professional & scientific | 2020 |
| Cast & Craft Ltd | Wholesale & retail | 2024 |
| Castle (Frimley) Ltd | Financial services | 2020 |
| Castle Frame Pictures Ltd | Information & communication | 2024 |
| Castle Residential Developments Limited | Professional & scientific | 2015 |