| Carrev Properties Ltd | Real estate | 1994 |
| Cartel Entertainment Ltd | Hospitality | 2018 |
| Carty Roofing & Building Limited | Construction | 2021 |
| Carty Roofing & Home Improvements Limited | Construction | 2025 |
| Carzuma Ltd | Wholesale & retail | 2021 |
| CAS Property Care LLP | | 2020 |
| Cascadia Water Limited | Construction | 2011 |
| Casey Lettings Ltd | Real estate | 2024 |
| Casper Properties Ltd | Real estate | 2016 |
| Casted Limited | Administrative & support | 2024 |
| Castellior Limited | Real estate | 2026 |
| Castle PK Ltd | Real estate | 2020 |
| Castle Roofing & Building Ltd | Construction | 2020 |
| Castle Roofing Contractors Limited | Construction | 2025 |
| Cat & Panda Limited | Wholesale & retail | 2017 |
| Catalina Saft Consulting Ltd | Other services | 2018 |
| Catalyst Accountants Limited | Professional & scientific | 2022 |
| Catalyst Music Publishing Limited | Arts & recreation | 1978 |
| Cataract Cornea Limited | Health & social care | 2021 |
| CAV Medical Support Services Ltd | Health & social care | 2019 |
| Cavicea Ltd | Wholesale & retail | 2021 |
| Cawley Transport Limited | Wholesale & retail | 2008 |
| Cayaa Limited | Real estate | 2023 |
| Cbbc Business Ltd | Real estate | 2021 |
| Cbudd's Co Ltd | Wholesale & retail | 2025 |
| Ccbn Property Ltd | Real estate | 2021 |
| Ccdental Limited | Health & social care | 2020 |
| Ccll Limited | Wholesale & retail | 2022 |
| Cdad Ltd | Professional & scientific | 2025 |
| Cdar Associates Limited | Construction | 2018 |
| CDL Cadservices Limited | Information & communication | 2006 |
| CDR Drylining Ltd | Construction | 2025 |
| Cecil Leslie Ltd | Real estate | 2023 |
| Cedarcare (London) Ltd | Construction | 2022 |
| Cedario Ltd | Information & communication | 2024 |
| Celebration Factory Ltd | Wholesale & retail | 2021 |
| Central Chauffeur Limited | Administrative & support | 2012 |
| Centre for Reflection and Creativity Ltd | Education | 2017 |
| Centrebridge Industries Co., Ltd | Administrative & support | 2023 |
| Centremark Limited | Real estate | 2022 |
| Centremark Properties Limited | Hospitality | 2006 |
| Centurion Home Improvements Limited | Construction | 2014 |
| Certek Ltd | Wholesale & retail | 2000 |
| Cetus Supply Chain Ltd | Administrative & support | 2021 |
| CF Management & Administration Services Ltd. | Professional & scientific | 2017 |
| CFO Network Limited | Professional & scientific | 2010 |
| Cfreal Ltd | Professional & scientific | 2025 |
| Chai Lounge Limited | Wholesale & retail | 2005 |
| Chaibisketruislip Ltd | Hospitality | 2025 |
| Chaman (PVT) Ltd | Wholesale & retail | 2015 |
| Chamomile Care Ltd | Health & social care | 2020 |
| Champavin Limited | Wholesale & retail | 2023 |
| Champions Goalkeeper Coaching Ltd | Education | 2020 |
| Chana & Sons Housing Ltd | Real estate | 2022 |
| Chandos Lodge Care Homes Ltd | Health & social care | 2015 |
| Change College Ltd | Education | 2024 |
| Changlida Trading Co., Ltd | Administrative & support | 2021 |
| Changlong Industrial Co., Ltd. | Extraterritorial | 2019 |
| Changshu Lingke Electric Appliance Co., Ltd | Wholesale & retail | 2019 |
| Changzhou To-Young Trade Co., Ltd | Administrative & support | 2021 |
| Chappel Consulting (Colchester) Ltd | Construction | 2014 |
| Chard Properties (UK) Limited | Wholesale & retail | 2005 |
| Charming Shiny Ltd | Wholesale & retail | 2022 |
| Chase Project Services Ltd | Construction | 2022 |
| CHC Coaching Ltd | Professional & scientific | 2018 |
| Cheat Day Icecream + Café Ltd | Wholesale & retail | 2020 |
| Cheeryoung Daily Chemical Co., Ltd. | Administrative & support | 2024 |
| Chelsea Systems Ltd | Information & communication | 2013 |
| Chelston Property Ltd | Real estate | 2026 |
| Chenab Traders UK Ltd | Wholesale & retail | 2024 |
| Cher Holdings Limited | Financial services | 2019 |
| Cherished Hearts Cremations Ltd | Other services | 2022 |
| Cherry Woodworkers Limited | Manufacturing | 1969 |
| Chestnut Tree Daycare Group Holdco Ltd | Health & social care | 2026 |
| Chestnut Tree Daycare Group Opco Ltd | Health & social care | 2026 |
| Chestnut Tree Daycare Group Propco Ltd | Health & social care | 2026 |
| Cheyne Property Holdings Ltd | Real estate | 2022 |
| Chez Lucy Ltd | Wholesale & retail | 2025 |
| Chhantyal Properties Investment Ltd | Real estate | 2023 |
| Chicken Land Express Ltd | Hospitality | 2017 |
| Chieza Home Care Ltd | Construction | 2026 |
| Chiltern House Ltd | Construction | 2023 |
| China Surplus International Limited | Extraterritorial | 2020 |
| Chris J Brough Ltd | Construction | 2015 |
| Chris Lloyd Property One Limited | Real estate | 2019 |
| Chris Ordway Limited | Professional & scientific | 2025 |
| Chris Roach Limited | Construction | 2003 |
| Chromatic Aberration Limited | Information & communication | 2011 |
| CHS Design Limited | Construction | 2007 |
| Chsn Ltd | Manufacturing | 2019 |
| Chuffed With HER Own Company Limited | Arts & recreation | 2025 |
| Church Road Central Stores Ltd | Wholesale & retail | 2019 |
| Churchill Property Care Limited | Construction | 2023 |
| Chuvia Group UK Ltd | Administrative & support | 2026 |
| Cill Iomair Plant Ltd | Administrative & support | 2025 |
| Cinardo Wealth Management Ltd | Professional & scientific | 2020 |
| Cinevoiz Ltd | Information & communication | 2024 |
| CIO Management Services Ltd | Households | 2019 |
| Circle 333 Ltd | Health & social care | 2020 |
| Circle Square Group Ltd | Administrative & support | 2020 |