| Cordage 25 Limited | Construction | 2020 |
| Cordage 26 Limited | Construction | 2020 |
| Cordage 36 Limited | Construction | 2021 |
| Cordage 4 Limited | Construction | 2018 |
| Cordage 40 Limited | Construction | 2021 |
| Cordage 41 Limited | Construction | 2021 |
| Cordage 44 Limited | Construction | 2021 |
| Cordage 46 Limited | Construction | 2022 |
| Cordage 9 Limited | Construction | 2019 |
| Cordage Apollo 21 Limited | Financial services | 2021 |
| Cordage Estates Limited | Other services | 2014 |
| Cordage Group Limited | Financial services | 2016 |
| Cordage Holdings Limited | Financial services | 2022 |
| Cordage Investments Limited | Financial services | 2022 |
| Cordage Professional Services Limited | Professional & scientific | 2025 |
| Cordage Racing Ltd | Arts & recreation | 2015 |
| Cordage Southbourne Property Limited | Financial services | 2022 |
| Cordell Evolution Limited | Information & communication | 2016 |
| Cordell Health Ltd | Health & social care | 2011 |
| Core Iirm Ltd | Manufacturing | 2019 |
| Corner Apartments RTM Company Ltd | Hospitality | 2009 |
| Cornerstone House Management Limited | Extraterritorial | 2016 |
| Cornerstone Plumbing Ltd | Households | 2026 |
| Cornerstone Property Construction Ltd | Construction | 2022 |
| Cornucopia Stores Ltd | Wholesale & retail | 2006 |
| Cornwell and Samson Close Freeholders Limited | Households | 2005 |
| Cors-It Limited | Manufacturing | 2007 |
| Corsair Doors Ltd | Manufacturing | 2019 |
| Corston Services Limited | | 1978 |
| COS360 Ltd | Professional & scientific | 2016 |
| Cosham Barber Ltd | Other services | 2022 |
| Cosham Cabin Ltd | Wholesale & retail | 2025 |
| Cosham Hand Car Wash & Valeting Centre Limited | Other services | 2019 |
| Cosham Mews Management Ltd | Households | 2022 |
| Cosham Properties Limited | Real estate | 1963 |
| Cosham Spice Limited | Hospitality | 2024 |
| Coshampizza Ltd | Hospitality | 2026 |
| Cosmech Services Limited | Professional & scientific | 2014 |
| Cosmic Sparkle Entertainment Ltd | Arts & recreation | 2015 |
| Cosmo Academic Ltd | Education | 2013 |
| Cosmo Education Limited | Education | 2014 |
| Cosmo Property Investment Ltd | Real estate | 2019 |
| Costalia Ltd | Wholesale & retail | 2025 |
| Costmetric Ltd | Administrative & support | 2025 |
| Cotswold Architecture and Design Ltd | Professional & scientific | 2023 |
| Cottage Grove Management Company Limited | Households | 1978 |
| Countrywide South Coast Limited | Other services | 2013 |
| County Carpentry and Home Improvements Ltd | Construction | 2021 |
| Countylink Limited | Extraterritorial | 2013 |
| Couper TAI Elite Glazing Ltd | Construction | 2025 |
| Couper TAI Elite Ltd | Construction | 2016 |
| Coursebycourse Brickwork Ltd | Construction | 2019 |
| Courtier Music Ltd | Arts & recreation | 2026 |
| Couzens Properties Limited | Real estate | 1996 |
| Covent Green Ltd | Real estate | 2019 |
| Cover Complete UK Ltd | Other services | 2025 |
| Cowes Boatyard Limited | Manufacturing | 2022 |
| Cowltech Woodburners Ltd | Construction | 2025 |
| Coworking Limited | Real estate | 2014 |
| Cowper Project Consultants Ltd | Arts & recreation | 2007 |
| CP Soles Ltd | Manufacturing | 2026 |
| CPA Products Ltd | Manufacturing | 2013 |
| CPB Dressage Ltd | Agriculture & fishing | 2026 |
| CPC Planning Consultants Limited | Professional & scientific | 2018 |
| CPP Installations Ltd | Construction | 2018 |
| CPS - Cypas.Eu Ltd | Financial services | 2009 |
| Craig Skerman GAS & Heating Services Ltd | Construction | 2021 |
| Craker Business Solutions Ltd | Professional & scientific | 2014 |
| Crane Sailing Limited | Construction | 2014 |
| Craneswater GAS Limited | Construction | 2008 |
| Crawford Clean Ltd | Administrative & support | 2019 |
| Crawford's Cleaning Ltd | Administrative & support | 2026 |
| CRC Cladding Limited | Construction | 2023 |
| Cream Home Developments Limited | Real estate | 2003 |
| Create Scale Limited | Professional & scientific | 2023 |
| Creating Waves Limited | Information & communication | 2008 |
| Creation Ltd | Information & communication | 2022 |
| Creation Web Solutions Ltd | Information & communication | 2020 |
| Creative Clique Limited | Professional & scientific | 2009 |
| Creative Driveways & Patio Solutions Limited | Administrative & support | 2014 |
| Creative Fabrication Solutions Limited | Extraterritorial | 2014 |
| Creative Harbour CIC | Education | 2022 |
| Creative World UK Limited | Professional & scientific | 2015 |
| Crescent Developments (Alverstoke) Ltd | Construction | 2024 |
| Crescent Power Ltd | Construction | 2017 |
| Crescent Properties (Alverstoke) Ltd | Real estate | 2011 |
| Crescit Consulting Limited | Information & communication | 2017 |
| Cresselia Ltd. | Construction | 2014 |
| Crest Automotive Tuning Ltd | Wholesale & retail | 2018 |
| Crest Facades Limited | Construction | 2017 |
| Crest Finance Brokers Limited | Financial services | 2016 |
| Crest Lense Ltd | Professional & scientific | 2025 |
| Crest Windows & Conservatories Limited | Construction | 2002 |
| Cresta Court Management Company Limited | Households | 1996 |
| Cresta Hub Ltd | Information & communication | 2026 |
| CRG Chimney Sweeps Limited | Administrative & support | 2008 |
| CRG Dental Ltd | Health & social care | 2023 |
| Crimetogrime Cleaning Services Ltd | Administrative & support | 2026 |
| Crisplen Healthcare Ltd | Administrative & support | 2022 |
| Crispy COD and Grill Limited | Hospitality | 2023 |