| Caile Ltd | Professional & scientific | 2012 |
| Caile Property Ltd | Real estate | 2021 |
| Caileag Ltd | Information & communication | 2013 |
| Cains Limited | Manufacturing | 2009 |
| Calibre MEP Ltd | Professional & scientific | 2026 |
| California Court (Belmont) Freehold Limited | Households | 2001 |
| Calla and Stone Design Ltd | Professional & scientific | 2018 |
| Callfield Limited | Households | 1994 |
| Calm Craft Ltd | Professional & scientific | 2023 |
| Calm Restored Limited | Other services | 2011 |
| Calma Retreats Limited | Health & social care | 2023 |
| Calmwood Limited | Wholesale & retail | 2025 |
| Calvin Road Management Limited | Administrative & support | 2019 |
| Camden Philharmonia Productions Ltd | Arts & recreation | 2022 |
| Camp Elite Ltd | Education | 2022 |
| Campbell Carpentry Ltd | Construction | 2015 |
| Campion Close Freeholders Limited | Real estate | 1993 |
| Camrose London Limited | Wholesale & retail | 2025 |
| Canary Express Taxis and Couriers Limited | Transport & logistics | 2010 |
| Candler Place Management Company Limited | Households | 2007 |
| Candy Anthony Holdings Limited | Manufacturing | 2012 |
| Candy Buffet Hire Kent Ltd | Wholesale & retail | 2012 |
| Cane Garden Investments Ltd | Professional & scientific | 2021 |
| Caneye Limited | Households | 1983 |
| Cannon Bridge Angels Limited | Financial services | 2018 |
| Cannon Bridge Group Limited | Financial services | 2019 |
| Cannon Bridge Portfolio Limited | Financial services | 2015 |
| Cannon Bridge Properties Limited | Real estate | 2014 |
| Cannon Bridge Ventures LLP | | 2018 |
| Cannon House RTM Company Limited | Households | 2024 |
| Cantab Ltd. | Households | 2001 |
| Canterburry Care Home Ltd | Health & social care | 2025 |
| Canyon Yachting UK Ltd | Extraterritorial | 2024 |
| Capable Minds Ltd | Professional & scientific | 2024 |
| Capan Limited | Professional & scientific | 2019 |
| Capel Consulting Limited | Professional & scientific | 2022 |
| Capital ABC Property Investments Ltd | Real estate | 2022 |
| Capital City Investment Limited | Real estate | 2015 |
| Capital Concierge PMC Ltd | Other services | 2026 |
| Capital Developments & Maintenance Limited | Construction | 2011 |
| Capital Enhancement Ltd | Professional & scientific | 2012 |
| Capital Lettors Limited | Real estate | 1996 |
| Capital Property Services UK Ltd | Administrative & support | 2007 |
| Capital Risk Technology Limited | Professional & scientific | 2013 |
| Capital Trade Networks UK Ltd | Wholesale & retail | 2024 |
| Caplan Real Estate Ltd | Real estate | 2022 |
| Capo Barber Ltd | Other services | 2026 |
| Capperinv Limited | Real estate | 2025 |
| Cappy Solutions Limited | Information & communication | 2025 |
| Capstone Industries Limited | Wholesale & retail | 2016 |
| Caractacus Innovations Ltd | Professional & scientific | 2025 |
| Carbon 12 Sports Limited | Professional & scientific | 2025 |
| Carbon Free Solutions Limited | Manufacturing | 2019 |
| Cardiomics Ltd | Health & social care | 2020 |
| Cardonixam Ltd | Wholesale & retail | 2025 |
| Care Prime Ltd | Administrative & support | 2022 |
| Care Sisters Limited | Health & social care | 2011 |
| Care Solutions & Support Services Limited | Health & social care | 2024 |
| Care Standard Organisation Ltd | Health & social care | 2020 |
| Care to Volunteer CIC | Health & social care | 2025 |
| Care Vision CMS (UK) Ltd | Information & communication | 2017 |
| Care Workers (UK) Ltd | Education | 2014 |
| Careciege Limited | Health & social care | 2018 |
| Career Guru Limited | Information & communication | 2017 |
| Career Strategy College Ltd | Professional & scientific | 2024 |
| Carepoint Holdings Ltd | Health & social care | 2024 |
| Caressa Kahn Manufacturing Company Limited | Manufacturing | 2023 |
| Carevoa Group Ltd | Administrative & support | 2025 |
| Carhoo | Real estate | 2012 |
| Carldyke Ltd | Professional & scientific | 2006 |
| Carletto Apparel Ltd | Wholesale & retail | 2025 |
| Carlile Associates Limited | Professional & scientific | 2000 |
| Carlton Ventures Limited | Real estate | 1995 |
| Caro Health Limited | Health & social care | 2018 |
| Caroline’S Greenacres Ltd | Administrative & support | 2024 |
| Carosh Resourcing Limited | Professional & scientific | 2015 |
| Carpet Cleaning London Pro Ltd | Administrative & support | 2019 |
| Carrara Building Services Limited | Construction | 1997 |
| Carrousel Design Ltd | Professional & scientific | 2014 |
| Cartel Barbers Limited | Other services | 2025 |
| Carters Properties Limited | Real estate | 2023 |
| CAS Gida Ltd | Hospitality | 2024 |
| Casa Blanca Property Management Limited | Real estate | 2019 |
| Casa DE Bassi Ltd | Information & communication | 2019 |
| Cascade Capital Partners Limited | Financial services | 2020 |
| Caselaw Management Limited | Real estate | 2002 |
| Cash Capital Ltd | Wholesale & retail | 2026 |
| Cass Bros Bromley Ltd | Wholesale & retail | 2013 |
| Cast Property Ltd | Real estate | 2024 |
| Castaways of London Limited | Wholesale & retail | 1998 |
| Castillia Limited | Real estate | 1990 |
| Castle Consulting Group Limited | Professional & scientific | 2016 |
| Castle House (Farnham) RTM Company Limited | Real estate | 2021 |
| Castle Meadows (Dudley) Limited | Health & social care | 2014 |
| Castle Oaks (Parkhill) Management Limited | Households | 1975 |
| Castlebridge Holdings Limited | Financial services | 1986 |
| Cat Developments Limited | Real estate | 1996 |
| Catch Limited | Hospitality | 2009 |
| CATER4CONSTRUCTIONS Ltd | Hospitality | 2022 |
| Caterham Court (Norwood) RTM Company Limited | Real estate | 2018 |