| Callum Elvin Properties Ltd | Real estate | 2023 |
| Calming Influences Limited | Information & communication | 2005 |
| Calmore Community Associates Ltd | Wholesale & retail | 2002 |
| Calmore Service Station Limited | Wholesale & retail | 2000 |
| Calpe Swing Fiesta Ltd | Education | 2016 |
| Calshot Group Limited | Financial services | 2021 |
| Calshot Joinery Limited | Manufacturing | 2021 |
| Calshot Shipwrights Limited | Manufacturing | 2021 |
| Caltech Services (South) Ltd | Construction | 2025 |
| Calvary Chapel Southampton Limited | Other services | 2009 |
| Calvert UK Limited | Professional & scientific | 2003 |
| Calvin's Podiatry Clinic Ltd | Health & social care | 2026 |
| Camargue Monks Brook Limited | Real estate | 2004 |
| Camargue Properties Limited | Professional & scientific | 1997 |
| Camargue Property Developments Limited | Construction | 1997 |
| Camargue West Bromwich Limited | Wholesale & retail | 1990 |
| CAMAZ87 Ltd | Transport & logistics | 2022 |
| Cambium Group Limited | Administrative & support | 2019 |
| Cambria Development Holdings Limited | Real estate | 2018 |
| Cambria Estates (Residential) Limited | Construction | 2019 |
| Cambria Estates (Wingham) Limited | Construction | 2008 |
| Cambria Estates Holdings Limited | Real estate | 2018 |
| Cambria Group Limited | Real estate | 2017 |
| Cambria Investment Holdings Limited | Real estate | 2018 |
| Cambria Land Limited | Real estate | 2018 |
| Cambria Property Group Limited | Real estate | 2017 |
| Cambria Scholars Ltd | Wholesale & retail | 2025 |
| Cambria Securities Holdings Limited | Real estate | 2018 |
| Cambria Securities Limited | Real estate | 2018 |
| Cambridge Court RTM Company Ltd | Households | 2009 |
| Camcon Robotics Ltd | Professional & scientific | 2022 |
| Camcross Limited | Other services | 2001 |
| Camelot Credit Solutions Limited | Financial services | 2005 |
| Camelot Estates Limited | Administrative & support | 1871 |
| Camelyon Ltd | Transport & logistics | 2018 |
| Cameo and Partners Ltd | Administrative & support | 2013 |
| Cameron International Limited | Wholesale & retail | 2000 |
| Camje CX Solutions Ltd | Professional & scientific | 2024 |
| Camoys LLP | | 2022 |
| Camp Road Development Limited | Construction | 2023 |
| Campana Property Management Limited | Real estate | 2020 |
| Campbell Coutts Limited | Manufacturing | 1992 |
| Campbell Property Management Ltd | Households | 2022 |
| Campervan & Road Trips Ltd | Administrative & support | 2023 |
| Campervan Adventures Limited | Wholesale & retail | 2024 |
| Campus Transfer Group Ltd | Professional & scientific | 2025 |
| Campus Transfer Ltd | Information & communication | 2025 |
| Camrox Ltd | Information & communication | 2018 |
| CAN CAN Services Ltd | Manufacturing | 2025 |
| Canada Place (Southampton) Management Company Limited | Households | 1997 |
| Canal Crest Dental Practice Limited | Health & social care | 2025 |
| Canapac Properties Limited | Real estate | 1994 |
| Candi Investment Property Limited | Real estate | 2018 |
| Candi IP Limited | Financial services | 2014 |
| Candlemas Place Residents Company Limited | Households | 1992 |
| Canfield Investments Limited | Administrative & support | 1995 |
| Cangojunior Limited | Wholesale & retail | 2025 |
| Cani Solutions Ltd | Information & communication | 2006 |
| Canna Grow Biosciences Limited | Manufacturing | 2018 |
| Cannon Trade Services Limited | Construction | 2024 |
| Canonvale Ltd | Other services | 2018 |
| Canute Emporium Ltd | Wholesale & retail | 2022 |
| Canute Management Services Limited | Professional & scientific | 1998 |
| Capcom Land Sea and Air Communications Limited | Information & communication | 1997 |
| Capeaq Limited | Administrative & support | 1997 |
| Capella Blue Limited | Information & communication | 2015 |
| Capella Capital Limited | Financial services | 2025 |
| Capella Homes Limited | Construction | 2017 |
| Capilaux Ltd | Professional & scientific | 2018 |
| Capital Business Solutions Limited | Wholesale & retail | 2020 |
| Capital DEE Ltd | Transport & logistics | 2019 |
| Capital Exits International Limited | Professional & scientific | 2016 |
| Capital MED Limited | Health & social care | 2020 |
| Capital Plans Limited | Administrative & support | 1983 |
| Capital Power Electric Ltd | Manufacturing | 2023 |
| Capitex Business Coaching Limited | Administrative & support | 2026 |
| Capl Group Ltd | Financial services | 2025 |
| Caplease Limited | Construction | 2018 |
| Caplin Bookkeeping Ltd | Professional & scientific | 2024 |
| Capoeira Marazul Limited | Arts & recreation | 2007 |
| Capra Security Services Ltd | Administrative & support | 2024 |
| Caprica Online Limited | Professional & scientific | 2009 |
| Capricorn Cancer Rising Ltd | Professional & scientific | 2019 |
| Capriol Ltd | Health & social care | 2014 |
| Capstan House (Warsash) Management Limited | Households | 2004 |
| Capstan House Management Company Limited | Households | 1993 |
| Capsulz Limited | Manufacturing | 2023 |
| Captain KEV Holdings Limited | Construction | 2022 |
| Captain Payments Limited | Financial services | 2021 |
| Captiva Management Ltd | Professional & scientific | 2009 |
| Captiva Sealing Limited | Professional & scientific | 2014 |
| Capture Zone Ltd | Information & communication | 2016 |
| Car & Commercial Components Limited | Wholesale & retail | 2011 |
| Car Exclusives Ltd | Wholesale & retail | 2024 |
| Car Leader Ltd | Wholesale & retail | 2025 |
| Car Link Imports Ltd | Wholesale & retail | 2025 |
| Car Rentals SO14 Ltd | Administrative & support | 2026 |
| Car Solutions Southern Limited | Administrative & support | 2008 |
| Car Spa & Valeting Car Wash Ltd | Administrative & support | 2023 |
| Car Trackers UK Ltd | Administrative & support | 2024 |