| Cranes Farming Limited | Agriculture & fishing | 2015 |
| Crazydayz Limited | Hospitality | 2021 |
| Crazydayz Wholesale Limited | Hospitality | 2023 |
| CRE8 IT Limited | Professional & scientific | 2020 |
| Cream-Salons Limited | Other services | 2007 |
| Creative Metal Solutions Ltd | Construction | 2010 |
| CRH Racing Limited | Arts & recreation | 2016 |
| Crimbourne Bloodstock Limited | Agriculture & fishing | 2015 |
| Crisp Telecom Limited | Other services | 2002 |
| Croft Gardens (Phase 2) Management Company Limited | Households | 2018 |
| Crofton House (Hungerford) Management Limited | Households | 2005 |
| Cromwell (London) Ltd | Real estate | 2018 |
| Crossfit Hungerford Limited | Arts & recreation | 2013 |
| Crushco Ltd | Professional & scientific | 2009 |
| CRX Ingredients Ltd | Wholesale & retail | 2026 |
| Crystal Turner Ltd | Health & social care | 2022 |
| CSM Financial Solutions Limited | Financial services | 2011 |
| Cultivate Digital Ltd | Information & communication | 2023 |
| Cumbrae Limited | Real estate | 1997 |
| Custos Legacy Capital Ltd | Financial services | 2025 |
| Cutting Edge Groundcare Services Limited | Administrative & support | 2023 |
| CWC Cleaning Services Limited | Administrative & support | 2024 |
| Cycle Hike UK Limited | Manufacturing | 2014 |
| Cykl Haus Boutique Ltd | Arts & recreation | 2016 |
| D & D Home Electrics Ltd | Construction | 2012 |
| D M Mason Engineering Consultants Limited | Administrative & support | 2003 |
| D.Osteen Limited | Health & social care | 2013 |
| D.R.S Building Ltd | Construction | 2024 |
| Daisy Whitehead Designs Limited | Professional & scientific | 2023 |
| Dalby Electrical Limited | Construction | 2018 |
| Danamyt Limited | Real estate | 2023 |
| Dantura Workshop Supplies Limited | Wholesale & retail | 2013 |
| Dark Island Holding Limited | Financial services | 2020 |
| Dark Lobster Ltd | Manufacturing | 2017 |
| Darnaby Asset Management Ltd | Real estate | 2024 |
| Data Termination Technology Limited | Manufacturing | 1997 |
| Dawson Equestrian Ltd | Wholesale & retail | 2018 |
| Dbconcepts Limited | Information & communication | 2010 |
| DC Contracts Limited | Construction | 2025 |
| DD & S Contract Services Ltd | Administrative & support | 2011 |
| DD Autos JLR Ltd | Wholesale & retail | 2024 |
| Definitive Electrical Limited | Energy | 2020 |
| Delicasanova Limited | Wholesale & retail | 2011 |
| Design Advantage Limited | Construction | 2015 |
| Design Mode Limited | Construction | 2023 |
| Designbase Exhibitions Limited | Administrative & support | 2007 |
| Designer Blinds Direct Limited | Wholesale & retail | 2003 |
| Designs Like These Ltd | Extraterritorial | 2012 |
| Dhabi Ltd | Real estate | 2015 |
| Diamond Reinforcements Ltd | Construction | 2024 |
| Dickins Hopgood Chidley LLP | | 2007 |
| Dida Gardens (Didcot) Management Company Limited | Households | 2019 |
| Different Perspective Training Ltd. | Education | 2017 |
| Digital Buildings Limited | Wholesale & retail | 2021 |
| Dirty Sams Burger Van Ltd | Hospitality | 2018 |
| DJD Property Limited | Real estate | 2015 |
| DJP Steel Ltd. | Wholesale & retail | 2017 |
| DJS Oakworks Limited | Construction | 2019 |
| DL Electrical Contractors Limited | Construction | 2018 |
| DM Coffee Ltd | Wholesale & retail | 2026 |
| Dmcn Consulting Services Ltd | Professional & scientific | 2019 |
| Donnington Heights (Newbury) Management Company Limited | Households | 2021 |
| Douglas Instruments Limited | Manufacturing | 1987 |
| DPF Woodlands Limited | Agriculture & fishing | 2020 |
| DR & S Watson's Property Maintenance Limited | Construction | 2020 |
| DR Watson's Property Services Limited | Construction | 2012 |
| Dragoni Technology Ltd | Information & communication | 2016 |
| Drapes - Oxon Limited | Wholesale & retail | 2014 |
| Driftway Consulting Limited | Professional & scientific | 2015 |
| DU PRE Marine Ltd | Wholesale & retail | 2011 |
| Duchray Castle Ltd | Real estate | 2018 |
| Duntshill Ltd | Construction | 2012 |
| Dusa NUA Investments Limited | Real estate | 2004 |
| Dutcher Property Holdings Limited | Real estate | 2025 |
| Dwsb Ltd | Professional & scientific | 2019 |
| E J Carter & R L Hibberd Ltd | Administrative & support | 2022 |
| E.D.D. Services Limited | Construction | 1992 |
| Eagle Bidco 2018 Limited | Financial services | 2018 |
| Earley Builders Limited | Construction | 2003 |
| Early Mediation Ltd | Information & communication | 2009 |
| East Garston Cricket Club Ltd | Arts & recreation | 2025 |
| East Hook and Kintbury Chase LLP | | 2012 |
| EB Elite Construction Ltd | Construction | 2015 |
| Echelon Quality Ltd | Professional & scientific | 2025 |
| Eco Roofing Solutions Limited | Real estate | 2008 |
| Eco-Pets Limited | Wholesale & retail | 2020 |
| ECT Finance Limited | Professional & scientific | 2022 |
| ED Walker Racing Ltd | Arts & recreation | 2010 |
| EDB Landscape Architecture Ltd | Professional & scientific | 2022 |
| Eddington Place Management Company Limited | Households | 1996 |
| Eddingtons Holdings Limited | Extraterritorial | 2012 |
| Eddingtons Limited | Wholesale & retail | 2000 |
| Edetta AD Astra Limited | Professional & scientific | 2023 |
| Edge Landscaping Ltd | Agriculture & fishing | 2018 |
| Edge Mushrooms Limited | Agriculture & fishing | 2026 |
| Eduk Ltd | Wholesale & retail | 2023 |
| Elcome Holdings Limited | Financial services | 2015 |
| Elcome Limited | Information & communication | 1999 |
| Eliane (Hungerford) Limited | Hospitality | 2013 |
| Ellie Dickins Shoes Limited | Wholesale & retail | 2003 |