| Capcroft Limited | Administrative & support | 2016 |
| Capital & Provincial (Realty) Limited | Real estate | 2007 |
| Capital Blue Painting & Decorating Ltd | Construction | 2019 |
| Capital Bread Ltd | Manufacturing | 2015 |
| Capital Construction (Slough) Limited | Construction | 2024 |
| Capital Gifts Europe Ltd | Wholesale & retail | 2017 |
| Capital Waste Group Ltd | Water & waste | 2026 |
| CAPITAL360 Services Ltd | Professional & scientific | 2021 |
| Caprikorn Ltd | Construction | 2018 |
| Capuana Limited | Information & communication | 2017 |
| Car Guys West London Ltd | Wholesale & retail | 2023 |
| Car Life Ltd | Wholesale & retail | 2018 |
| Car Part Order (CPO). Ltd | Wholesale & retail | 2025 |
| Care at Home Services Limited | Health & social care | 2017 |
| CARE-4U Consultants Ltd | Health & social care | 2016 |
| Carers on Call Ltd | Health & social care | 2021 |
| Caretrade Limited | Wholesale & retail | 2019 |
| Caretrade One Limited | Other services | 2025 |
| Cargoplug Logistics Limited | Transport & logistics | 2025 |
| Carishma Limited | Professional & scientific | 2017 |
| Carlton Lodge (Lowndes Street) Management Limited | Households | 1995 |
| Carmel Court Limited | Real estate | 2007 |
| Carmonka Limited | Wholesale & retail | 2024 |
| Carnival Slayers Limited | Professional & scientific | 2018 |
| Caro Construction Ltd | Construction | 2016 |
| Carolco Media Ltd | Information & communication | 2012 |
| Carpentry Consultancy Limited | Financial services | 2026 |
| Carpentry Division Ltd | Manufacturing | 2008 |
| Carpentry Property Limited | Manufacturing | 2026 |
| Carreira Cleaning Ltd | Administrative & support | 2018 |
| Cars Engineering Limited | Wholesale & retail | 2013 |
| Carsgate Ltd | Wholesale & retail | 2019 |
| Carter Precious Metals Limited | Wholesale & retail | 2020 |
| Casa Rivaro Limited | Manufacturing | 2025 |
| Cashay Finance Limited | Financial services | 2003 |
| Cassia Consultancy Ltd | Professional & scientific | 2017 |
| Castle Park Investments Limited | Real estate | 2024 |
| Castle View Properties & Consultants Limited | Real estate | 2023 |
| Cater & Dine Ltd | Hospitality | 2016 |
| Catering 4 Catering (UK) Limited | Professional & scientific | 2003 |
| CCL (WT) 3 Ipco Ltd | Professional & scientific | 2019 |
| CE London Ltd | Construction | 2023 |
| CEE DHT Ltd | Health & social care | 2019 |
| Ceka Construction Limited | Construction | 2008 |
| Celestial Church of Christ Wembley Promise of GOD Parish | Other services | 2011 |
| Cemtre Ltd | Real estate | 2018 |
| Central Warehouse Solutions Ltd | Real estate | 2025 |
| Centre for Legal AID Assistance and Settlement | Other services | 2001 |
| Century Corporation Ltd | Professional & scientific | 2013 |
| Cerasoli Media Ltd | Information & communication | 2022 |
| Certa Investment Ltd | Real estate | 2025 |
| Certildn Ltd | Wholesale & retail | 2026 |
| Ceruleancards Ltd | Wholesale & retail | 2026 |
| Ceylon Travelgate Limited | Administrative & support | 2016 |
| CFS Plant and Logistic Ltd | Other services | 2019 |
| CG Electrical Group Ltd | Construction | 2026 |
| CGA Sports Specialist Ltd | Manufacturing | 2025 |
| CHA Properties Ltd | Real estate | 2016 |
| Chai-Lifeline Cancer Care | Health & social care | 1998 |
| Chai-Lifeline Services Limited | Extraterritorial | 1994 |
| Champions Stud Farm Ltd | Agriculture & fishing | 2025 |
| Chan Property Services Limited | Real estate | 2019 |
| CHANGE14 Limited | Information & communication | 2025 |
| Chaoyang Limited | Hospitality | 2023 |
| Charles Hampton Ltd | Administrative & support | 2015 |
| Charm Enterprises Limited | Real estate | 2025 |
| Charnley Care Homes Limited | Health & social care | 1997 |
| Charuthas Limited | Transport & logistics | 2020 |
| Chase Residential Limited | Real estate | 2016 |
| Chater Business Management Ltd | Manufacturing | 2024 |
| Cheatmeals Ltd | Hospitality | 2021 |
| Cheeky Box Ltd | Wholesale & retail | 2015 |
| Cheers Corner Ltd | Wholesale & retail | 2024 |
| Cheetah Online Ltd | Wholesale & retail | 2020 |
| Cheezious Pizza PVT Ltd | Hospitality | 2023 |
| Chef a Casa Limited | Hospitality | 2015 |
| Chefchriswheeler Limited | Other services | 2017 |
| Chelsea Career Services Ltd | Health & social care | 2019 |
| Cherish Care Homes (UK) Limited | Financial services | 2007 |
| Cherry Distribution Limited | Wholesale & retail | 2026 |
| Chesterford Gardens Management Company Limited | Households | 1994 |
| Chestnut Property Investments Ltd | Real estate | 2019 |
| Chicago Chefs Ltd | Hospitality | 2016 |
| Chicken NW6 Ltd | Hospitality | 2024 |
| Chilli Spice and Booze Ltd | Wholesale & retail | 2022 |
| China From China Limited | Wholesale & retail | 2009 |
| Chippology Ltd | Hospitality | 2019 |
| Chippy Business Ltd | Wholesale & retail | 2018 |
| CHO OYU Ltd | Extraterritorial | 2023 |
| Choice Tool & Plant Hire Limited | Administrative & support | 2011 |
| Chra Locuming Ltd | Public administration | 2023 |
| Chra Logistics Ltd | Households | 2025 |
| Chris Howie Fabrications Limited | Wholesale & retail | 2012 |
| Chris Zurowski Consulting Limited | Professional & scientific | 2011 |
| Chris&Bianca Catering Events Limited | Administrative & support | 2022 |
| Christ in YOU Ltd | Wholesale & retail | 2023 |
| Christmas Tree London Ltd | Administrative & support | 2017 |
| Christopher Ross BSC Limited | Information & communication | 2013 |
| Cinnamon Express Ltd | Hospitality | 2025 |
| Circle General Investments Limited | Real estate | 2025 |