| Crfr Limited | Real estate | 2012 |
| Crisp UP Limited | Information & communication | 2020 |
| Cristo Housing CIC | Health & social care | 2025 |
| Critical Insights Consultancy Ltd | Professional & scientific | 2020 |
| CRM Savvy Limited | Professional & scientific | 2005 |
| Croft Contracting Limited | Construction | 2012 |
| Crowley Carbon International Services 2 Limited | Extraterritorial | 2018 |
| Crowley Carbon International Services Limited | Extraterritorial | 2018 |
| Crown Coaching Ltd | Professional & scientific | 2008 |
| Crown Compass Group Ltd | Administrative & support | 2025 |
| Crown Ecommerce Ltd | Wholesale & retail | 2026 |
| Crown Place Residents Limited | Households | 2005 |
| Croyde Bay House Management Company Limited | Real estate | 2007 |
| Crystal Hearing Limited | Health & social care | 2007 |
| Crystal Rocks UK Design Ltd | Manufacturing | 2014 |
| CUB Coffee Limited | Manufacturing | 2021 |
| Cullimore Investments Limited | Real estate | 2000 |
| Cultivate Fitness Ltd | Arts & recreation | 2021 |
| Cureadosity Limited | Wholesale & retail | 2020 |
| Currage Consulting Ltd | Professional & scientific | 2025 |
| Curzon Marketing Limited | Professional & scientific | 2008 |
| Custom Club Clothing Ltd | Wholesale & retail | 2014 |
| Cyberinfosec Ltd | Information & communication | 2023 |
| D J a Management Consulting Limited | Professional & scientific | 1997 |
| D-Style Ltd | Manufacturing | 2019 |
| D.G.Pink Developments Limited | Construction | 1964 |
| DA Luca Restaurant Limited | Hospitality | 2014 |
| Dacos Silverbirch Ltd | Real estate | 2024 |
| DAD Associates Limited | Professional & scientific | 2016 |
| Damp Music LLP | | 2023 |
| Dance Building and Roofing Limited | Construction | 2014 |
| Danesfield Hotels and Resorts Limited | Hospitality | 2020 |
| Danesfield Limited | Hospitality | 2026 |
| Dani Klein Media Limited | Professional & scientific | 2022 |
| Dansjam Limited | Real estate | 2010 |
| Daphne Press Ltd | Wholesale & retail | 2022 |
| Dara Estates Ltd | Real estate | 2024 |
| Dark Shield Limited | Information & communication | 2026 |
| DAT71 Consultancy Services Ltd | Other services | 2019 |
| Data Driven Capital Ltd | Professional & scientific | 2023 |
| Datanomous Ltd | Wholesale & retail | 2023 |
| Datasolve Solutions Limited | Information & communication | 2008 |
| Dave Kitson Coaching Limited | Arts & recreation | 2024 |
| David-Bonnefoy Ltd | Hospitality | 2017 |
| Davidge Place (Knotty Green) Management Company Limited | Households | 2002 |
| Davies Accounting Services Ltd | Professional & scientific | 2026 |
| Dawnstep Property Management Limited | Households | 1986 |
| DC Maintenance Marlow Ltd | Other services | 2023 |
| DCB Estates Limited | Real estate | 2017 |
| DCL Lettings Ltd | Real estate | 2023 |
| DE Vere Electrical Solutions Ltd | Construction | 2019 |
| DE Winton Lodge RTM Company Limited | Households | 2017 |
| De'Lisle Editorial Limited | Information & communication | 2012 |
| Dean Kirby Ltd | Education | 2026 |
| Decide Holding Co Ltd | Financial services | 2025 |
| Dedmere Consulting Ltd | Professional & scientific | 2024 |
| Dedmere Rise Management Company Limited | Households | 1988 |
| Defence Darts Community Ltd | Arts & recreation | 2026 |
| Defence Darts Ltd | Wholesale & retail | 2026 |
| Delany & Co. Ltd | Professional & scientific | 2013 |
| Dene House (Windsor) Management Limited | Households | 2006 |
| Dentaladria UK Ltd | Professional & scientific | 2018 |
| Dermamedica Aesthetics Ltd | Other services | 2014 |
| DES Commercial Limited | Real estate | 2018 |
| DEV Accounting Services Limited | Professional & scientific | 2012 |
| Development Cricket Limited | Arts & recreation | 2018 |
| DFW Consulting Services Ltd | Professional & scientific | 2018 |
| DGM Ventures Ltd | Administrative & support | 2013 |
| DHA Services Limited | Other services | 2003 |
| Dhillon Consultancy & Assessment Ltd | Health & social care | 2021 |
| DI Donna Limited | Other services | 2010 |
| Diavola Ltd | Wholesale & retail | 2026 |
| Digital Collaboration Limited | Information & communication | 2020 |
| Digital Marketing Edge Limited | Information & communication | 2020 |
| Dinemar Films Limited | Extraterritorial | 2008 |
| Discovery Club Limited | Manufacturing | 2019 |
| Distil Coaching Ltd. | Professional & scientific | 2023 |
| Distlytics Ltd | Professional & scientific | 2016 |
| Distribution Technology Limited | Information & communication | 2019 |
| Diversym Limited | Professional & scientific | 2024 |
| Diving Department Ltd | Arts & recreation | 2025 |
| DLB Communications Ltd | Professional & scientific | 2011 |
| DM Plumbing Limited | Construction | 2023 |
| Doogall & Co Limited | Manufacturing | 2024 |
| DOT K Trading Ltd | Financial services | 2024 |
| Double Eight Ltd. | Financial services | 1998 |
| Doubleg Ltd | Wholesale & retail | 2023 |
| Douglass Electrical Consulting Services Ltd | Professional & scientific | 2023 |
| Doulton & Co Limited | Professional & scientific | 2011 |
| Dove Court (Beaconsfield) Limited | Households | 1993 |
| Dover Electrical Services Limited | Other services | 2014 |
| DPV Consult Limited | Professional & scientific | 2020 |
| DR L Holman Ltd | Health & social care | 2020 |
| Dragonbridge Communications Ltd | Professional & scientific | 2019 |
| Dreamteam Solutions Ltd | Professional & scientific | 2025 |
| Drew Lear Technology Limited | Information & communication | 2009 |
| Drip Sauna Limited | Other services | 2025 |
| DRK Medic Services Ltd | Professional & scientific | 2013 |
| DU SOL Productions Limited | Arts & recreation | 2011 |
| Dudley Court (Slough) Limited | Households | 1963 |