| Croft House Property Ltd | Real estate | 2025 |
| Crossbuild Development Ltd | Real estate | 2025 |
| Crossways House Limited | Professional & scientific | 2019 |
| Crowland Fresh Chips Limited | Hospitality | 2024 |
| Crowland Property Limited | Households | 2020 |
| Crowst. Ltd | Hospitality | 2025 |
| Crystal Meats Limited | Wholesale & retail | 2018 |
| Crystal Sympathy Limited | Real estate | 2019 |
| CSS (Private) Limited | Transport & logistics | 2025 |
| CT3 Solution Ltd | Information & communication | 2024 |
| CTC9A9 Limited | Construction | 2025 |
| CTH Resource Economics Ltd | Professional & scientific | 2005 |
| CTS Retail Ltd | Information & communication | 2008 |
| Cubewise Solutions (UK) Limited | Information & communication | 2015 |
| Cubo Consulting Ltd | Professional & scientific | 2016 |
| Curious Blue Fish Limited | Information & communication | 2013 |
| Curnow Media Group Ltd | Professional & scientific | 2022 |
| Curry Garden Cornwall Limited | Hospitality | 2025 |
| Curve Executive Limited | Professional & scientific | 2023 |
| Custom Awards Ltd | Manufacturing | 2023 |
| Custom House Flats Management Company (ST Ives) Limited | Households | 1990 |
| CVC Investments Limited | Real estate | 2022 |
| CVU Ltd | Information & communication | 2025 |
| Cybermatrix Limited | Extraterritorial | 2024 |
| D and L Hospitality Limited | Hospitality | 2011 |
| D&A Professional Builders Ltd | Construction | 2018 |
| D&Hr Media Limited | Professional & scientific | 2023 |
| D'Arcy & Everest Limited | Extraterritorial | 1992 |
| D.C Engineering Maintenance Limited | Manufacturing | 2022 |
| D.M Coachworks Ltd | Wholesale & retail | 2026 |
| Dadea Care Ltd | Public administration | 2023 |
| Daeodon Limited | Financial services | 2020 |
| Dahu Energy Limited | Energy | 2026 |
| Dalton & COX Estates Ltd | Real estate | 2022 |
| DAN Marsh Plastic Surgery Limited | Health & social care | 2016 |
| Dandelion Literacy for ALL CIC | Education | 2026 |
| Dangail Ltd | Real estate | 2024 |
| Darke AV Limited | Construction | 2019 |
| Darke Engineering Holdings Limited | Construction | 2017 |
| Darke Engineering Project Services LLP | | 2017 |
| Darren Marriott Construction Ltd | Construction | 2026 |
| Data Analysts User Group Limited | Other services | 2017 |
| David Frank Consulting Limited | Professional & scientific | 2004 |
| David Wilson Services (ST Ives) Ltd | Construction | 2018 |
| Davies Dawson Commercial Limited | Real estate | 2015 |
| Davies Dawson Residential Limited | Real estate | 2015 |
| Day Tree Services Limited | Other services | 2018 |
| Dayclean LLP | | 2002 |
| Daytona Calibration and Engineering Services Limited | Professional & scientific | 2025 |
| Daytona Equipment Ltd | Manufacturing | 2019 |
| Dbts Limited | Wholesale & retail | 2007 |
| DDB Home Solutions Limited | Construction | 2012 |
| DE Bene Esse Limited | Real estate | 2009 |
| Dean & Dean Construction Limited | Construction | 2008 |
| Dean & Dean Developments Limited | Construction | 2024 |
| Deats Ltd | Wholesale & retail | 2014 |
| Debbie's Property Limited | Real estate | 2021 |
| Decoder Art CIC | Arts & recreation | 2020 |
| Decymar Limited | Hospitality | 2013 |
| Deep Sea Vision Ltd | Professional & scientific | 2024 |
| Deeprose Wealth Management Ltd | Financial services | 2025 |
| Defined Plastering (Cambridge) Ltd | Construction | 2014 |
| Defined Properties Ltd | Real estate | 2021 |
| Delish Baba Ltd | Hospitality | 2024 |
| Delish St.Ives Ltd | Hospitality | 2018 |
| Delta Fabrications Limited | Manufacturing | 2012 |
| Deluxe Delusions Ltd | Wholesale & retail | 2026 |
| Demirs Limited | Real estate | 2024 |
| Den's ALL Vehicle Bodyshop Ltd | Wholesale & retail | 2024 |
| Denham-Vaughan Associates Limited | Education | 2008 |
| Denis Mulholland Financial Solutions Ltd. | Professional & scientific | 2019 |
| Dermxai Limited | Information & communication | 2021 |
| Derryman & Ireson Ltd | Real estate | 2016 |
| Design Principle Studio Limited | Professional & scientific | 2023 |
| Devocean Boat Rides Ltd | Transport & logistics | 2023 |
| Dewdney Property Ltd | Real estate | 2025 |
| DGJ Project Services Ltd | Construction | 2021 |
| DGR Concrete Limited | Manufacturing | 2023 |
| DHK Marine Ltd | Professional & scientific | 2025 |
| Digital Splash Limited | Professional & scientific | 2019 |
| Direct Finance Limited | Financial services | 2018 |
| DJS Browne Limited | Other services | 2011 |
| DLW Management Ltd | Construction | 2024 |
| Dmps Holdings Limited | Real estate | 2021 |
| DMT Property Services Ltd | Real estate | 2003 |
| Doddington Properties Limited | Real estate | 2018 |
| Doddington Services Limited | Administrative & support | 2011 |
| Dolby Developments Limited | Construction | 1986 |
| DOM Mary Limited | Hospitality | 2025 |
| Dommam Holdings Ltd | Financial services | 2020 |
| Done & Dusted - Cambridgeshire Ltd | Administrative & support | 2024 |
| Dops Digital (UK) Limited | Professional & scientific | 2023 |
| Dops Digital Limited | Information & communication | 2020 |
| Dove Building Services Ltd | Manufacturing | 2022 |
| Dove Celine Limited | Real estate | 2023 |
| Dove Celine Valentine Limited | Real estate | 2024 |
| Dovic 91 Ltd | Construction | 2020 |
| DR Bennett Aesthetics Clinic and Academy Limited | Other services | 2025 |
| Drakeberry Limited | Real estate | 2017 |
| Dream Space Lettings Ltd | Real estate | 2022 |