| Crowcombe Properties Ltd | Hospitality | 2019 |
| Crowhurst & Sharp Limited | Arts & recreation | 2020 |
| Crown Civil Engineering Limited | Construction | 2012 |
| Crown Valeting & Sales Limited | | 1989 |
| Croxton Limited | Manufacturing | 2012 |
| Crucible Law Limited | Professional & scientific | 2020 |
| Cruse Control Business Systems Limited | Information & communication | 2020 |
| Crystal Cars East Grinstead Ltd | Transport & logistics | 2024 |
| Crystal One Solutions Limited | Administrative & support | 2017 |
| CSC Acquisition Limited | Financial services | 2024 |
| CSC Corporate Finance Limited | Financial services | 2006 |
| CTA Accountants & Consultants Limited | Professional & scientific | 2010 |
| Cura Contracts Limited | Construction | 2026 |
| Curry Special Limited | Hospitality | 2022 |
| CUT and Cleaned Services Ltd | Administrative & support | 2024 |
| Cuttlefish Limited | Manufacturing | 2005 |
| Cuttlefish Pharma Limited | Health & social care | 2020 |
| CW Farms (Sussex) Limited | Agriculture & fishing | 2022 |
| Cyber Infinity 8008 Limited | Construction | 2024 |
| Cyberian Ltd | Information & communication | 2011 |
| Cydonia Capital Ltd | Financial services | 2021 |
| Cyebridge Online School Ltd | Education | 2020 |
| Cymatic Threadz Ltd | Wholesale & retail | 2025 |
| Cynthia House Limited | Real estate | 2011 |
| CZ Therapy Limited | Other services | 2024 |
| Czeiner Ltd | Wholesale & retail | 2019 |
| D & Co Property Investments Limited | Real estate | 2024 |
| D & T Cleaning Service Limited | Administrative & support | 2025 |
| D J P International Limited | Professional & scientific | 1997 |
| D&R BI Analysis Ltd | Administrative & support | 2018 |
| D.A. Wadsworth Limited | Professional & scientific | 1990 |
| D.L. Developments Limited | Construction | 1998 |
| D.R. Heating Solutions Ltd | Construction | 2021 |
| D2-UK Ltd | Arts & recreation | 2009 |
| D93 Trading Ltd | Other services | 2026 |
| Daily Outflow Ltd | Professional & scientific | 2025 |
| Daisy’S Car Company Ltd | Wholesale & retail | 2020 |
| Dalston Hall Properties Ltd | Real estate | 2022 |
| Dalston Hall Venue Ltd | Hospitality | 2022 |
| Daly Construction and Surveying Services Limited | Construction | 2008 |
| Damaca Advisory Limited | Professional & scientific | 2020 |
| DAN Punt Electrical Contractors Ltd | Administrative & support | 2019 |
| Danby Castle Barn Ltd | Hospitality | 2022 |
| Danby Castle Events Limited | Hospitality | 2014 |
| Danby Castle Properties Ltd | Financial services | 2022 |
| Dance Health Alliance Limited | Health & social care | 2018 |
| Dandelion PUB Company Ltd | Administrative & support | 2013 |
| Danjode Marketing Limited | Professional & scientific | 2003 |
| Dann Architectural Design UK Ltd | Professional & scientific | 2023 |
| DATUM3D Ltd | Professional & scientific | 2025 |
| David Holman & Co. Limited | Real estate | 1971 |
| David Holman Holdings Limited | Financial services | 1978 |
| David Platt KC Limited | Extraterritorial | 2012 |
| David White Roofing Ltd | Construction | 2024 |
| David Wilson on Time Solutions Ltd | Construction | 2018 |
| Davies & Wood LLP | | 2019 |
| Daviscon Limited | Professional & scientific | 2015 |
| Day Repairs Ltd | Real estate | 2024 |
| Day's Accountancy and Tax Solutions Limited | Professional & scientific | 2016 |
| Dazzle Racing LLP | | 2021 |
| DB Event Logistics Limited | Transport & logistics | 2024 |
| DB Games Limited | Information & communication | 2022 |
| DE Havilland Limited | Manufacturing | 2025 |
| DE Photo (Franchising) Limited | Professional & scientific | 2004 |
| DE Wolf Sports Ltd | Arts & recreation | 2014 |
| Dealdelight Ltd | Wholesale & retail | 2020 |
| Dedicated Retail Limited | Wholesale & retail | 2019 |
| Deep Landing UK Ltd | Other services | 2025 |
| Deepseek AI Ltd | Wholesale & retail | 2019 |
| Definitive Security Services Limited | Administrative & support | 2025 |
| Delfort UK Limited | Professional & scientific | 2002 |
| Delicious Interiors Limited | Administrative & support | 2010 |
| Dellgo Training Limited | Education | 2018 |
| Delta Autos (SW19) Limited | Wholesale & retail | 2021 |
| Deltahome Systems Limited | Construction | 2011 |
| Demsa Properties Ltd | Real estate | 2023 |
| Derek Field & Co Ltd | Professional & scientific | 2026 |
| Destination Ithaca Limited | Real estate | 2007 |
| Detection Drain Services Limited | Construction | 2008 |
| Devco Build Ltd | Construction | 2015 |
| Dezid-Developments Ltd | Wholesale & retail | 2020 |
| DF Engineering & Consultancy Limited | Professional & scientific | 2024 |
| DH Invest Ltd | Administrative & support | 2019 |
| DHC London Holdings Limited | Administrative & support | 2025 |
| Dialog Ltd | Wholesale & retail | 2011 |
| Diamond BTL Ltd | Real estate | 2016 |
| Diamond Estate Holdings Ltd | Real estate | 2026 |
| Diamond Gleam Bath Repairs South East Limited | Other services | 2025 |
| Diamond Nail TVN Ltd | Other services | 2023 |
| Digbys Dog Grooming Ltd | Other services | 2020 |
| Diggaway Groundwork & Landscaping Ltd | Administrative & support | 2021 |
| Digismith Ltd | Professional & scientific | 2014 |
| Digital Dental Design Ltd | Manufacturing | 2023 |
| Digital Dental Education Ltd | Manufacturing | 2019 |
| Digital Dental Solutions Ltd | Manufacturing | 2020 |
| Digital Repair Centre Ltd | Other services | 2022 |
| Digitall Ticket Ltd | Information & communication | 2018 |
| Digitree Technology Ltd | Construction | 2020 |
| Digivolve Limited | Professional & scientific | 2020 |
| Dignity Access Limited | Administrative & support | 2013 |