| C.A.M. (Production Engineers) Limited | Real estate | 1986 |
| C.B. Precision Engineering Ltd | Professional & scientific | 2014 |
| C.D. Jones Ventures Ltd | Administrative & support | 2024 |
| C.H.Chapman Limited | Real estate | 1953 |
| C.L.W. Builders Limited | Construction | 2008 |
| C.M. Ogle Limited | Wholesale & retail | 1979 |
| C2DESIGNS Limited | Professional & scientific | 2019 |
| C2MC Limited | Professional & scientific | 2015 |
| C5 Prime Ventures Ltd | Transport & logistics | 2026 |
| C9.0 Ltd | Information & communication | 2018 |
| Ca'Fine Ltd | Manufacturing | 2025 |
| Cabledata Limited | Information & communication | 2006 |
| Cabzone Ltd | Transport & logistics | 2022 |
| Cactus Mortgages Limited | Financial services | 2019 |
| Cade Capital Ltd | Professional & scientific | 2015 |
| Caerus Productions Limited | Administrative & support | 2009 |
| Cafe Kabana Worcester Ltd | Hospitality | 2025 |
| Cafe Loco (Forgate) Ltd | Hospitality | 2016 |
| Cafe Loco Shrubhill Ltd | Hospitality | 2018 |
| Cafe Rene Limited | Hospitality | 2012 |
| Cafwin Cruises Narrowboat Holidays Limited | Administrative & support | 2018 |
| Calder Limited | Manufacturing | 1980 |
| Caldewell Farm Barns Residents Limited | Households | 2003 |
| Calibre Executive Partners Limited | Administrative & support | 2026 |
| Callblocker Limited | Information & communication | 2005 |
| Callisto Life Science Partners Ltd | Professional & scientific | 2019 |
| Callow Developments Ltd | Real estate | 2011 |
| Callow Property Developments Ltd | Construction | 2024 |
| Callow's Tree Surgery Ltd | Agriculture & fishing | 2019 |
| Calma Quick Spa Limited | Health & social care | 2023 |
| Calmneed Limited | Administrative & support | 2002 |
| Calsigi UK Limited | Information & communication | 2014 |
| Camaleon Ltd | Professional & scientific | 2009 |
| Cambrian Flying Group Ltd | Arts & recreation | 2004 |
| Camcity Ltd | Information & communication | 2025 |
| Camcraft Limited | Manufacturing | 1989 |
| Camelia Gems Limited | Manufacturing | 2021 |
| Camelot Real Fires Ltd | Manufacturing | 2015 |
| Camenzie Ltd | Professional & scientific | 2015 |
| Camera Support Services Limited | Professional & scientific | 1998 |
| Camisado Ltd | Hospitality | 2018 |
| Camo Hair (ST Johns) Limited | Other services | 2018 |
| Camo Hair Limited | Other services | 2011 |
| Camomile & Cornflowers Limited | Wholesale & retail | 2014 |
| Campervan Diaries Group Ltd | Construction | 2026 |
| CAN YOU Just Limited | Transport & logistics | 2023 |
| Candy Cravings Ltd | Hospitality | 2024 |
| Canefield Ltd | Hospitality | 2002 |
| Caoilfhionn Dunne Ltd | Arts & recreation | 2025 |
| Capagi Limited | Real estate | 2004 |
| Cape Medical Services Limited | Administrative & support | 1998 |
| Capirlo Limited | Professional & scientific | 2017 |
| Capital 42 Limited | Real estate | 2016 |
| Capital Assets Limited | Real estate | 2023 |
| Capital Strategy Associates UK Ltd | Administrative & support | 2012 |
| Capitol Hill Investments LLP | | 2008 |
| Capsa Digital Limited | Administrative & support | 2021 |
| Car Booters Club Ltd | Extraterritorial | 2002 |
| Car Care Droitwich Limited | Wholesale & retail | 2003 |
| Car Parts Devon Ltd | Wholesale & retail | 2017 |
| Car Wash Factory Ltd | Wholesale & retail | 2021 |
| Car-Comm Coachworks Limited | Wholesale & retail | 1990 |
| Carandra Ltd | Financial services | 2024 |
| Caravan Information Services Ltd | Information & communication | 2023 |
| Caravan Values Guide Limited | Information & communication | 2025 |
| Caravanserai Events Ltd | Hospitality | 2026 |
| Carbon Navigation Ltd | Information & communication | 2025 |
| Carbootfairs Ltd | Extraterritorial | 2000 |
| Cardan (PFP) Ltd | Financial services | 2025 |
| Cardan Business Services Ltd | Professional & scientific | 2017 |
| Cardan Financial Group Limited | Other services | 2020 |
| Cardan Wealth Management LLP | | 2025 |
| Cardea Property Consultancy Ltd | Professional & scientific | 2023 |
| Cardshops Limited | Real estate | 1995 |
| Cardwell Hill Developments Ltd | Real estate | 2011 |
| Care and Support Staff Limited | Administrative & support | 2021 |
| Care Boss Ltd | Health & social care | 2022 |
| Care Ceramics CIC | Health & social care | 2014 |
| Care Consultancy Services ( Worldwide ) Ltd | Administrative & support | 2017 |
| Care Edge Limited | Health & social care | 2020 |
| Care Inc Ltd | Professional & scientific | 2015 |
| Care Partners Limited | Administrative & support | 2026 |
| CARE2RECRUIT (Temps) Ltd | Administrative & support | 2019 |
| CARE2RECRUIT (TEMPS2) Ltd | Administrative & support | 2019 |
| CARE2RECRUIT - Locums Ltd | Administrative & support | 2019 |
| CARE2RECRUIT Residential Recruitment Ltd | Administrative & support | 2019 |
| Carecreative Limited | Information & communication | 2018 |
| Caremind Recruitment Healthcare Services Limited | Health & social care | 2025 |
| Carers & Communities Ltd | Wholesale & retail | 2026 |
| Carers & Communities Trading Ltd | Wholesale & retail | 2025 |
| Caring in Homes Ltd | Health & social care | 2026 |
| Carl Jukes Conservation Consultant Limited | Professional & scientific | 2014 |
| Carlos Innovations Ltd | Wholesale & retail | 2024 |
| Carlos Sparkling Home Supplies Ltd | Wholesale & retail | 2026 |
| Carmen Valentine Limited | Wholesale & retail | 2004 |
| Carmichael & Sons (Worcester) Limited | Real estate | 1977 |
| Carmichael Fire International Limited | Professional & scientific | 2009 |
| Carmichael Property Rentals Limited | Real estate | 2024 |
| Caroline Sheppard Footwear & Accessories Ltd | Wholesale & retail | 2011 |
| Carolliam Limited | Real estate | 2012 |