| Caglayan Ltd | Hospitality | 2025 |
| Cairns Trading Ltd | Wholesale & retail | 2016 |
| Caissa Solutions Ltd | Information & communication | 2016 |
| Cake Bling Bling Ltd | Wholesale & retail | 2023 |
| Cake Box Holdings PLC | Manufacturing | 2013 |
| Cake Drip Ltd | Hospitality | 2020 |
| Cakemeistro Ltd | Manufacturing | 2017 |
| Cakes and Shakes Enfield Ltd | Hospitality | 2019 |
| Cal's Cakes and Pastries Ltd | Other services | 2015 |
| Calgan Properties Ltd | Real estate | 2021 |
| Calhan Tailoring Limited | Wholesale & retail | 2020 |
| Cali Nails & Beauty Limited | Other services | 2023 |
| Cali Services Ltd | Administrative & support | 2019 |
| Callnow Limited | Information & communication | 2015 |
| Calmac Projects Limited | Construction | 2020 |
| Calypso Gymnastics CIC | Arts & recreation | 2023 |
| Calypso Gymnastics Club Ltd | Arts & recreation | 2022 |
| CAM Supermarket Ltd | Wholesale & retail | 2016 |
| Cambridge International Education Ltd. | Education | 2015 |
| Cambridge Stars Barber Ltd | Other services | 2016 |
| Cambz Ltd | Information & communication | 2025 |
| Camden CUT Ltd | Other services | 2018 |
| Camden Town Retro & Vintage Limited | Wholesale & retail | 2025 |
| Camden Vintage London Limited | Wholesale & retail | 2026 |
| Camel Media Services Limited | Administrative & support | 2018 |
| Camel Properties Group Limited | Construction | 2018 |
| Camel Property Investments Ltd | Real estate | 2020 |
| Camelot 33 Holdings Ltd | Financial services | 2026 |
| Camerata Limited | Wholesale & retail | 2017 |
| Campaign for Change Ltd | Extraterritorial | 2024 |
| Campania Trading Limited | Financial services | 2013 |
| Camsterdam Ltd | Manufacturing | 2022 |
| CAN Electrical Repair and Maintenance Ltd | Manufacturing | 2020 |
| Canadian AV Holding Ltd | Real estate | 2020 |
| Canadian AV Management Ltd | Real estate | 2020 |
| Candan Fruit and Vegetable Delivery Ltd | Wholesale & retail | 2023 |
| Candeo Properties Ltd | Construction | 2006 |
| Candleflame Ltd | Wholesale & retail | 2026 |
| Cane Industries Limited | Manufacturing | 2018 |
| Cani 1 Construction Ltd | Construction | 2021 |
| Cani Properties Ltd | Real estate | 2022 |
| Canonbury Electrical Limited | Construction | 2010 |
| Canterbury Live Limited | Arts & recreation | 2025 |
| Canvas Tutoring Limited | Education | 2025 |
| CAO Family Limited | Other services | 2024 |
| Capaan UK Limited | Public administration | 2025 |
| Capar Property Ltd | Real estate | 2024 |
| Capel Manor Limited | Wholesale & retail | 1993 |
| Caphands Services Ltd | Administrative & support | 2018 |
| Capital Cast Limited | Professional & scientific | 2018 |
| Capital Developments (Harringay) Limited | Real estate | 1995 |
| Capital Foodservice Ltd | Wholesale & retail | 2020 |
| Capital Green Cars Limited | Transport & logistics | 2009 |
| Capital Media Event Productions Ltd | Extraterritorial | 2009 |
| Capital Restaurant Ltd | Hospitality | 2023 |
| Capital Shine Ltd | Administrative & support | 2025 |
| Capital Waste and Recycling Ltd | Water & waste | 2015 |
| Capitalize Limited | Hospitality | 2026 |
| Capitalize Partners Ltd | Hospitality | 2025 |
| Cappa Homes Ltd | Real estate | 2026 |
| Caprimax Limited | Manufacturing | 2024 |
| Caps Electrical Ltd | Construction | 2015 |
| Captains Fold Limited | Information & communication | 2012 |
| Captash Ltd | Wholesale & retail | 2010 |
| Captive Minds Media Limited | Information & communication | 2018 |
| Captive Minds Studios Limited | Information & communication | 2019 |
| Capture Architecture Limited | Professional & scientific | 2007 |
| Car Breakdown Operators Ltd | Wholesale & retail | 2025 |
| Car Key London Ltd | Other services | 2025 |
| Cara Legacy Ltd | Real estate | 2026 |
| Carbuyer Network Ltd | Wholesale & retail | 2024 |
| Card Cocoon Ltd | Wholesale & retail | 2025 |
| Card COP Ltd | Wholesale & retail | 2026 |
| Card Land Limited | Wholesale & retail | 2009 |
| Carda Limited | Other services | 2005 |
| Cardiac Diagnostic Network Ltd. | Health & social care | 2011 |
| Cards Pool Management Ukeig | | 2016 |
| Care Club London | Hospitality | 2022 |
| Care Nest Plus Ltd | Health & social care | 2026 |
| Carea Ltd | Transport & logistics | 2025 |
| Careart UK Limited | Administrative & support | 2014 |
| Career Cornerstone Ltd | Education | 2025 |
| Careguard HSE Ltd | Information & communication | 2026 |
| Caretax Accountants Ltd | Professional & scientific | 2015 |
| Caria Golf Ltd | Arts & recreation | 2021 |
| Caria Holidays Ltd | Administrative & support | 2015 |
| Caria Limited | Other services | 2022 |
| Caria Property Ltd | Real estate | 2024 |
| Carib'Break Ltd | Hospitality | 2020 |
| Caring Consultants UK Ltd | Health & social care | 2022 |
| Carja Plumbing & Heating Ltd | Construction | 2019 |
| Carl Pullen Design Ltd | Professional & scientific | 2025 |
| Carl.Tv Ltd | Information & communication | 2023 |
| Carlisle Haulage & Transport Solutions Ltd | Extraterritorial | 2024 |
| Carlito's Tints Limited | Wholesale & retail | 2015 |
| Carlitos Tintss Ltd | Wholesale & retail | 2024 |
| Carlton Property Sales Ltd | Extraterritorial | 2015 |
| Carmarthen Nails Ltd | Other services | 2019 |
| Carmella London Ltd | Wholesale & retail | 2020 |
| Carnegie Catering Ltd | Hospitality | 2019 |