| Costin Nicoll Ltd | Transport & logistics | 2017 |
| Costling Engineers Limited | Manufacturing | 1965 |
| Cosy Coastal Lets Ltd | Hospitality | 2021 |
| Cosywombat Limited | Hospitality | 2024 |
| Cote Properties Ltd | Real estate | 2024 |
| Coto&Totoias Ltd | Transport & logistics | 2025 |
| Cotterstock Land Company Limited | Real estate | 2002 |
| Coughar Trader Ltd | Wholesale & retail | 2023 |
| Couleira Homes Ltd | Households | 2024 |
| Coulsonbuild Limited | Construction | 2024 |
| Coulter Innovations Ltd | Manufacturing | 2023 |
| Coulter Recruitment Limited | Administrative & support | 2026 |
| Countryside and Coastal Properties Ltd | Households | 2025 |
| Countrywide (Cambs) Limited | Real estate | 2018 |
| Courier Path Ltd | Transport & logistics | 2025 |
| Courier Quick Limited | Transport & logistics | 2015 |
| Court 1 Ltd | Arts & recreation | 2020 |
| Court Housing Limited | Households | 1985 |
| Couture Trimming Ltd | Administrative & support | 2019 |
| Cove Producers Limited | Manufacturing | 1999 |
| Cove Residents Company Limited | Households | 2004 |
| Coventry Hoses and Appliances Limited | Manufacturing | 2001 |
| Cowbit Property Limited | Extraterritorial | 2021 |
| Cowboy 'N' Smoke Ltd | Hospitality | 2025 |
| Cozma Logistics Ltd | Transport & logistics | 2022 |
| Cozy Essentials Limited | Wholesale & retail | 2025 |
| Cozy Lets Ltd | Real estate | 2020 |
| Cozy Properties Limited | Real estate | 2016 |
| CP Cafe Peterborough Ltd | Hospitality | 2022 |
| CP Expert Solutions Ltd | Wholesale & retail | 2021 |
| CP Learning Trust | Education | 2003 |
| CPC (Peterborough) Management Company Limited | Households | 2021 |
| CPD Media Limited | Professional & scientific | 2020 |
| CPH Resourcing Ltd | Administrative & support | 2023 |
| Cpkm Properties Limited | Real estate | 2019 |
| CPP Cambs Ltd | Hospitality | 2022 |
| CPS Real Estate Ltd | Extraterritorial | 2021 |
| CPW Mortgages Ltd | Financial services | 2018 |
| CQ Investments Ltd | Real estate | 2023 |
| CR7 Capital Investments Ltd | Financial services | 2025 |
| Crac Properties Investments Ltd | Construction | 2026 |
| Crackers of Oundle Limited | Wholesale & retail | 2013 |
| Crafted Verse Ltd | Wholesale & retail | 2024 |
| Craftiful Ltd | Wholesale & retail | 2022 |
| Craftline Solutions Limited | Manufacturing | 2025 |
| Craftsman (UK) Limited | Manufacturing | 1998 |
| Crafty by Toni Ltd | Arts & recreation | 2025 |
| Crafty JAX Limited | Wholesale & retail | 2019 |
| Craig Seager Limited | Construction | 2016 |
| Cranbrook Grange Management Company Limited | Households | 2024 |
| Crane Fruits Limited | Wholesale & retail | 2016 |
| Cranelogix Ltd | Information & communication | 2025 |
| Cranfield Home Improvements Ltd | Construction | 2010 |
| Cranston Plastering Limited | Construction | 2018 |
| Cranwell Residents Company Limited | Households | 2004 |
| Crash Media Group Limited | Information & communication | 1999 |
| Cratelink Ltd | Wholesale & retail | 2026 |
| Crawthorne Group Ltd | Other services | 2025 |
| Crazy Autos Ltd | Wholesale & retail | 2025 |
| Crazy ME Ltd | Real estate | 2019 |
| Crazy Pro Events Ltd | Information & communication | 2025 |
| Crcomsnet Ltd | Construction | 2025 |
| CRE8IVE Marketing Limited | Information & communication | 2017 |
| Creams Peterborough Ltd | Hospitality | 2015 |
| Creation Booth Limited | Information & communication | 2007 |
| Creation Roofing Limited | Construction | 2025 |
| Creations Dessert Lounge Ltd | Hospitality | 2019 |
| Creative Oundle Ltd. | Arts & recreation | 1995 |
| Creative Plus Family Holdings Ltd | Financial services | 2024 |
| Creative Plus Property Solutions Ltd | Real estate | 2024 |
| Creative Plus Trading Family Holdings Ltd | Financial services | 2024 |
| Creative Produce Solutions Limited | Professional & scientific | 2009 |
| Creative Property Partners Ltd | Construction | 2024 |
| Creative Property Renovations Ltd | Construction | 2023 |
| Creative Touch Interiors Limited | Manufacturing | 2016 |
| Creativey Ltd | Information & communication | 2020 |
| Credence Law Limited | Professional & scientific | 2023 |
| Creed & Colour Limited | Other services | 2022 |
| Creid Surveys Ltd | Professional & scientific | 2023 |
| Creightons Limited | Manufacturing | 2025 |
| Cren Holdings Limited | Real estate | 2024 |
| Creo Tattoo Ltd | Arts & recreation | 2024 |
| Crescent Carpentry and Building Limited | Construction | 2013 |
| Crescent Locum Limited | Health & social care | 2017 |
| Crescent Moon Estates Ltd | Real estate | 2025 |
| Cresion Ltd | Information & communication | 2026 |
| Cresnt Limited | Information & communication | 2011 |
| Cresswood Developments Ltd | Construction | 2024 |
| Crestel Holdings Limited | Construction | 2016 |
| Crestwell Homes Ltd | Real estate | 2024 |
| Crestworld Limited | Hospitality | 2025 |
| Crglobal Couriers Ltd | Transport & logistics | 2025 |
| CRH Plastering Limited | Construction | 2022 |
| Cricketing Futures Ltd | Professional & scientific | 2013 |
| Crickhowell Residents Company Limited | Households | 2002 |
| Crigas Ltd | Construction | 2026 |
| Crisdra Ltd | Wholesale & retail | 2026 |
| Crisecca Creations Limited | Arts & recreation | 2022 |
| Crisp and Vivid Ltd | Wholesale & retail | 2020 |
| Crisp Cleaning Services Ltd | Administrative & support | 2024 |