| Cooking Marvellous Limited | Wholesale & retail | 2010 |
| Coomber Care Company Limited | Health & social care | 2011 |
| Copperfield Recruitment Limited | Administrative & support | 2003 |
| Copse Investments Ltd | Real estate | 2024 |
| Core N Kettle Ltd | Wholesale & retail | 2025 |
| Cornergem Ltd | Health & social care | 2025 |
| Cosyhomes Windows Limited | Construction | 2005 |
| Countrywide Total Window and Building Solutions Limited | Construction | 2011 |
| Craft and Graft Limited | Administrative & support | 2015 |
| Craft Paradise Limited | Wholesale & retail | 2026 |
| Crafted Concept Ltd | Information & communication | 2015 |
| Crathorne Productions Ltd | Information & communication | 2024 |
| Crave & Co Trading Ltd | Wholesale & retail | 2026 |
| Crawshaw RTM Company Limited | Real estate | 2011 |
| Createable HR Limited | Administrative & support | 2020 |
| Creative Associates (Europe) Ltd. | Professional & scientific | 2003 |
| Crockford Park Management Company Limited | Real estate | 2017 |
| Crockford Park Properties Limited | Administrative & support | 1969 |
| Crump & Co., Solicitors, Limited | Professional & scientific | 1992 |
| CSM Living Ltd | Construction | 2026 |
| CT19 Ltd | Information & communication | 2019 |
| CTS Autoworks Limited | Wholesale & retail | 2003 |
| Curly Sister Limited | Construction | 2011 |
| Cyberkey IT Secure Solutions Limited | Information & communication | 2026 |
| Cybr Technologies Ltd | Wholesale & retail | 2022 |
| D & K Retail Limited | Wholesale & retail | 2014 |
| D E Cleaning ALL Season Cleaning Limited | Administrative & support | 2019 |
| D Frost Heating Engineering Limited | Construction | 2011 |
| D Huskinson Limited | Construction | 2017 |
| D M Management Limited | Other services | 2018 |
| D W Morgan Holdings Limited | Financial services | 2025 |
| D2I Management Limited | Professional & scientific | 2016 |
| DA Maxim Construction Ltd | Construction | 2021 |
| DAC Business Services Ltd | Administrative & support | 2016 |
| Daleside Road Ltd | Real estate | 2020 |
| Daltin EDU Group Limited | Administrative & support | 2024 |
| Dannys Services Ltd | Professional & scientific | 2024 |
| Darius & Jack Ltd | Manufacturing | 2018 |
| Data FX Limited | Information & communication | 2023 |
| Data Rights Protection Limited | Other services | 2022 |
| Data Technics Ltd | Construction | 2022 |
| Data-Lec Limited | Information & communication | 1999 |
| Datamerse Limited | Extraterritorial | 2020 |
| Dataq Consultancy Ltd | Professional & scientific | 2023 |
| Davhen Limited | Manufacturing | 2022 |
| David Arnold Ltd | Construction | 2008 |
| Dazy Mart Limited | Wholesale & retail | 2025 |
| DE Grato Limited | Professional & scientific | 2013 |
| Deecays Healthcare Limited | Public administration | 2022 |
| Denis Kostenko Building Services Ltd | Construction | 2011 |
| Denton Scott Ltd | Real estate | 2018 |
| Desserteria Ltd | Hospitality | 2024 |
| Devereau Ltd | Construction | 2019 |
| Dexters Home Essentials Ltd | Wholesale & retail | 2023 |
| DFG Consultancy Ltd | Transport & logistics | 2015 |
| Diamond Nail Chertsey Ltd | Other services | 2025 |
| Digital Dream Ltd | Information & communication | 2025 |
| Dilly Daydream Ltd | Wholesale & retail | 2021 |
| Dimora Capital Ltd | Real estate | 2025 |
| Disborough Holdings Ltd | Real estate | 2021 |
| Disco Fusion Limited | Hospitality | 2025 |
| Distrupol Limited | Wholesale & retail | 1963 |
| Divine Property Investors Ltd | Hospitality | 2020 |
| DJN Ventilation Limited | Construction | 2015 |
| DK Nails & Spa Limited | Other services | 2025 |
| Dlrs Property Services Limited | Real estate | 2014 |
| DMA Partners Ltd | Transport & logistics | 2007 |
| Dobler Metallbau GmbH | | 2005 |
| Dockett Moorings Management Limited | Households | 1991 |
| Doctor's Daughter London Ltd | Wholesale & retail | 2020 |
| Doctors Plus Limited | Health & social care | 2010 |
| Dolomieu Consultants Limited | Administrative & support | 2010 |
| Domican Capital Group Ltd | Financial services | 2026 |
| Dornden Electrical Company Limited | Other services | 2005 |
| Dosa Idly Shop Ltd | Wholesale & retail | 2025 |
| Douglas Associates Limited | Professional & scientific | 2007 |
| DP Props Limited | Other services | 2023 |
| DR Leinad Rolyat-Nacimod & Sons Ltd | Manufacturing | 2025 |
| Dragon International Trade Limited | Wholesale & retail | 2024 |
| Drained Ltd | Information & communication | 2023 |
| Drake Boilers Ltd | Construction | 2025 |
| Drake.Com Limited | Professional & scientific | 2000 |
| Drewl Holdings Limited | Professional & scientific | 2022 |
| Drift Auto Limited | Wholesale & retail | 2024 |
| Drip Drinks Limited | Wholesale & retail | 2019 |
| Drip Punch Limited | Manufacturing | 2019 |
| Drumgrange Limited | Professional & scientific | 1979 |
| Dryguard Roofing Ltd | Construction | 2025 |
| DS Landscaping and Construction Limited | Administrative & support | 2020 |
| Dublee Property Ltd | Real estate | 2021 |
| Dupres Doubleglazing & Property Services Ltd | Construction | 2025 |
| DWR Travel Ltd | Administrative & support | 2024 |
| Dyer Holdings Ltd | Financial services | 2022 |
| E a Neary Ltd | Professional & scientific | 2012 |
| E-Business Integrated Solutions Limited | Information & communication | 2000 |
| E.L.J.S. Capital | Financial services | 2025 |
| E2 Bodyworks Limited | Manufacturing | 2019 |
| E7 Works Ltd | Construction | 2021 |
| Earthood UK Limited | Professional & scientific | 2021 |
| Easycool Solutions Ltd | Other services | 2017 |