| CORINTHIAN11 Ltd | Extraterritorial | 2025 |
| Cornell Investment Properties Limited | Administrative & support | 2015 |
| Cornerstone Performance Limited | Information & communication | 2019 |
| Cornick Limited | Real estate | 2021 |
| Cornucopia (Poole) Ltd. | Hospitality | 2005 |
| Corporate Capital Solutions Limited | Financial services | 2015 |
| Corq Studio Limited | Information & communication | 2016 |
| Corrindale Consultants Limited | Professional & scientific | 2024 |
| Corrovia Ltd | Professional & scientific | 2025 |
| Cortana Limited | Construction | 2021 |
| Cortex London Ltd | Wholesale & retail | 2025 |
| Cortmerron Freehold Limited | Households | 2005 |
| Cortry MOT Ltd | Wholesale & retail | 2020 |
| Corvelle Ltd | Information & communication | 2025 |
| Corven Ltd | Administrative & support | 2009 |
| Cosam Ltd | Wholesale & retail | 2018 |
| Cosmic Cactus Ltd | Education | 2021 |
| Cosmic Virtual Services Ltd | Information & communication | 2023 |
| Costemic Ltd | Other services | 2016 |
| Cosy Window Cleaning Ltd | Water & waste | 2018 |
| Cotes Court Management Ltd | Households | 2020 |
| Cotheena Ltd | Information & communication | 2024 |
| Cotness Limited | Real estate | 2021 |
| Cottage Grounds Maintenance Ltd | Administrative & support | 2025 |
| Cottage PIE Bothies Ltd | Real estate | 2026 |
| Cottees Auctions Limited | Wholesale & retail | 2006 |
| Coughlan Entertainment Ltd | Administrative & support | 2025 |
| Country Leaf | Financial services | 2007 |
| Country Leaf Investments Limited | Financial services | 2021 |
| Country Projects Limited | Construction | 1996 |
| Country Properties (Wessex) Limited | Real estate | 1963 |
| Countrywide Motorhomes Ltd. | Wholesale & retail | 2002 |
| Countrywide Moves (UK) Limited | Transport & logistics | 2016 |
| Countwize Ltd | Information & communication | 2025 |
| County Epos Limited | Manufacturing | 2011 |
| County Foods Limited | Wholesale & retail | 2004 |
| County Gates Developments Ltd | Construction | 2020 |
| County PAY Ltd | Administrative & support | 2026 |
| County Road Properties Ltd | Real estate | 2023 |
| County Staircases Ltd | Construction | 2023 |
| Courage to Thrive Community Interest Company | Other services | 2016 |
| Courtney Health Limited | Administrative & support | 2025 |
| Courtney Holdings Ltd. | Administrative & support | 1998 |
| Covam Limited | Professional & scientific | 2011 |
| Cove (Southwest) Ltd | Agriculture & fishing | 2013 |
| Coverson Holdings Ltd | Financial services | 2025 |
| Cowley Road Motors Limited | Wholesale & retail | 2006 |
| Cowork Collective Ltd | Real estate | 2023 |
| Cozy Rooms Ltd | Real estate | 2018 |
| Cozzolino Limited | Professional & scientific | 2017 |
| CP Automotive Ltd | Wholesale & retail | 2021 |
| CP Sport | Education | 2001 |
| CPH Construction Limited | Construction | 2005 |
| CPH Holding Group Ltd | Real estate | 2026 |
| CPK Ltd | Information & communication | 2026 |
| CPM Coins Limited | Extraterritorial | 2013 |
| CPP Team Ltd | Information & communication | 2020 |
| Cppb Limited | Professional & scientific | 2016 |
| CPR Property Solutions Ltd | Construction | 2018 |
| CPS Electrical Services (Dorset) Ltd | Construction | 2018 |
| CR Accountancy Solutions Limited | Financial services | 1999 |
| CRA5 Strategy Management Limited | Professional & scientific | 2018 |
| Cracovia Accounting Service Ltd | Information & communication | 2016 |
| Cracovia Ltd | Professional & scientific | 2014 |
| Craft Urban Design Ltd | Professional & scientific | 2020 |
| Crafted Moments Ltd | Wholesale & retail | 2025 |
| Crafts and Giggles Limited | Other services | 2013 |
| Crafty Capers Limited | Wholesale & retail | 2008 |
| Craig a Morrison Ltd | Information & communication | 2026 |
| Cramdos Developments Ltd | Real estate | 2016 |
| Cramdos Properties LLP | | 2016 |
| Cranberrygirl Ltd | Wholesale & retail | 2014 |
| Cranborne Court (Swanage) Management Company Limited | Households | 1992 |
| Cranbrook Holdings Ltd | Real estate | 2016 |
| Cranbrook Road RTM Company Limited | Professional & scientific | 2008 |
| Crane Valley PCN Ltd | Health & social care | 2024 |
| Cranleigh Lodge Day Nursery Limited | Education | 2007 |
| Crater Plato Limited | Information & communication | 2024 |
| Crayside Environmental Limited | Professional & scientific | 2025 |
| Crayside Holdings Limited | Financial services | 2020 |
| Crazy 88 Limited | Real estate | 2024 |
| Crazy Valentino Limited | Construction | 2015 |
| CRC Rosewood Holdings Ltd | Real estate | 2026 |
| Crcm Ltd | Administrative & support | 2018 |
| CRE Holdings Limited | Financial services | 2018 |
| Create & Draw Ltd | Professional & scientific | 2023 |
| Create Design Print Ltd | Administrative & support | 2012 |
| Create Lofts and Extensions Ltd | Construction | 2023 |
| Create Visual Aids Ltd | Education | 2021 |
| Creating the Magic Limited | Professional & scientific | 1997 |
| Creation 41 Ltd | Wholesale & retail | 2025 |
| Creation Tours Ltd | Administrative & support | 2023 |
| Creativ Commerce Ltd | Wholesale & retail | 2020 |
| Creative Capsule Ltd | Information & communication | 2012 |
| Creative Data LAB Limited | Information & communication | 2025 |
| Creative Engineering Ltd | Manufacturing | 2024 |
| Creative Flooring & Tiling Limited | Construction | 2016 |
| Creative Lightbulb Ltd | Manufacturing | 2022 |
| Creative Motion Studios Ltd | Information & communication | 2025 |
| Creative Outlook Education Ltd | Education | 2024 |