| Canary Contracting Ltd | Information & communication | 2025 |
| Candcfoods Limited | Hospitality | 2025 |
| Candidink Limited | Administrative & support | 2017 |
| Candle LIA Limited | Wholesale & retail | 2024 |
| Cane Island IP Rights Limited | Administrative & support | 2019 |
| Canem Supplements Limited | Wholesale & retail | 2026 |
| Canna Plus Ltd | Wholesale & retail | 2019 |
| Canncierge Ltd | Financial services | 2022 |
| Cannon Electrical and Data Limited | Manufacturing | 2011 |
| Canopy Consulting Limited | Information & communication | 2025 |
| Canrehab Trust | Education | 2020 |
| Cansdale HAY and Straw Ltd | Agriculture & fishing | 2025 |
| Canton Smith Ltd | Administrative & support | 2025 |
| Canvey Fest Limited | Arts & recreation | 2025 |
| Canwood Supplies Limited | Wholesale & retail | 2024 |
| Canyon Transport Ltd | Transport & logistics | 2021 |
| Capere Teamwear Limited | Manufacturing | 2026 |
| Capital Auction Group Ltd | Wholesale & retail | 2022 |
| Capital M Merchandise Ltd | Wholesale & retail | 2024 |
| Capital Strategy Partners Ltd | Information & communication | 2025 |
| Capital View Property Group Ltd | Real estate | 2022 |
| Capitalclear Courses Ltd | Financial services | 2023 |
| Capricorn Carpets Ltd | Wholesale & retail | 2023 |
| Capslock Services Ltd | Professional & scientific | 2022 |
| Captain Planet Ltd | Hospitality | 2020 |
| Captain Zaidi Ltd | Construction | 2020 |
| Captifi Ltd | Information & communication | 2024 |
| Capture Automation Limited | Information & communication | 2016 |
| Capulus Consulting Ltd | Professional & scientific | 2017 |
| Car Properties Services Limited | Real estate | 2020 |
| Cara MIA Spiritual Guidance Ltd | Health & social care | 2018 |
| Carberry Plumbing and Heating Ltd | Construction | 2018 |
| Carbon Cockpit Limited | Wholesale & retail | 2022 |
| Carbon Education Ltd | Administrative & support | 2017 |
| Carbon Recruitment Ltd | Administrative & support | 2017 |
| Carboned OUT Ltd | Manufacturing | 2024 |
| Carcare Centre Ltd | Wholesale & retail | 2024 |
| Card Boutique Ltd | Wholesale & retail | 2018 |
| Card Geezers Ltd | Information & communication | 2026 |
| Carder Limited | Wholesale & retail | 2026 |
| Cardiac Stitch Ltd | Health & social care | 2024 |
| Cardinal Arrakis Ltd | Professional & scientific | 2021 |
| Cardinoir Limited | Information & communication | 2025 |
| Care @ Home Newbury Limited | Health & social care | 2011 |
| Care Path Pharma Ltd | Professional & scientific | 2026 |
| Care to Crown CIC | Education | 2026 |
| CARE808 Ltd | Health & social care | 2026 |
| Carebliss Limited | Administrative & support | 2020 |
| Career Capital Ltd | Professional & scientific | 2024 |
| Careerfusion Academy Ltd | Information & communication | 2025 |
| Caremenow Limited | Health & social care | 2026 |
| Carextra Limited | Administrative & support | 2025 |
| Carfax Cards,Limited | Manufacturing | 1927 |
| Caribana Ltd | Hospitality | 2026 |
| Caribe Foods Ltd | Hospitality | 2018 |
| Caring Hearts at Home Ltd | Health & social care | 2024 |
| Carique Ltd | Wholesale & retail | 2024 |
| Carivegan Limited | Hospitality | 2021 |
| Carkonnect Ltd | Wholesale & retail | 2022 |
| Carlis Investments Limited | Wholesale & retail | 2006 |
| Carlo Design Ltd | Professional & scientific | 2022 |
| Carlton Chippy Ltd | Hospitality | 2021 |
| Carmarnie Limited | Financial services | 2015 |
| Carnelian Heart Publishing Ltd | Information & communication | 2020 |
| Carningli Caregivers Ltd | Health & social care | 2025 |
| Carnival Parties Limited | Arts & recreation | 2013 |
| Caroline Hardy Limited | Wholesale & retail | 2003 |
| Caroline Sandiford Limited | Professional & scientific | 2015 |
| Carousel Property Management Ltd | Administrative & support | 2023 |
| Cartdoor Ltd | Wholesale & retail | 2023 |
| Carter Jacques Ltd | Administrative & support | 2023 |
| Carter Web Consultancy Limited | Information & communication | 2016 |
| Carter-Culley Strategies Ltd | Wholesale & retail | 2025 |
| Carthage Group Ltd | Professional & scientific | 2024 |
| Cartox Global Ltd | Wholesale & retail | 2026 |
| Carve Digital Ltd | Information & communication | 2025 |
| Carver IT Ltd | Information & communication | 2017 |
| Carvum Limited | Financial services | 2025 |
| Casa Primo Property Ltd | Real estate | 2024 |
| Casa Textile Limited | Wholesale & retail | 2024 |
| Casaroo Ltd | Real estate | 2025 |
| Case Accountancy & Bookkeeping Limited | Professional & scientific | 2014 |
| Case Property Holdings Limited | Real estate | 2023 |
| Caseva Limited | Administrative & support | 1997 |
| Cashsh Ltd | Construction | 2024 |
| Casilion Ltd | Real estate | 2016 |
| Casino Links Market Limited | Professional & scientific | 2026 |
| Caslon Ventures Ltd | Professional & scientific | 2024 |
| Casora Stays Ltd | Real estate | 2025 |
| Castillejo Limited | Information & communication | 2022 |
| Castle Building Contractors (Holdings) Limited | Financial services | 2020 |
| Castle Building Contractors (London) Limited | Construction | 1999 |
| Castle Camps Clays Limited | Arts & recreation | 1984 |
| Castle Capers Limited | Arts & recreation | 2004 |
| Castle Cleaning Ltd | Administrative & support | 2022 |
| Castle Corbenic Ltd | Information & communication | 2012 |
| Castle Host Ltd | Real estate | 2024 |
| Castlebridge Agency Limited | Agriculture & fishing | 2021 |
| Castor Property Developments Ltd | Real estate | 2010 |
| Castree Property Ltd | Real estate | 2023 |