| Cycomms Limited | Wholesale & retail | 2022 |
| Cyder City Ltd | Real estate | 2020 |
| Cyfor Limited | Extraterritorial | 2005 |
| CYG Estates Ltd | Real estate | 2026 |
| CYG Property Ltd | Real estate | 2024 |
| Cygg Limited | Professional & scientific | 2017 |
| Cygnet Plastics Ltd | Manufacturing | 2020 |
| Cygnustech Ltd | Information & communication | 2019 |
| Cyjiesg Ltd | Wholesale & retail | 2026 |
| Cylex (UK) Ltd | Construction | 2002 |
| Cyma Trading Ltd | Wholesale & retail | 2026 |
| CYN Estates Ltd | Real estate | 2026 |
| Cyna Management Ltd | Professional & scientific | 2023 |
| Cynefin Management Company Limited | Households | 2023 |
| Cynex Ltd | Wholesale & retail | 2026 |
| Cyntex Solutions Limited | Information & communication | 2014 |
| Cynth Fine Foods Ltd | Wholesale & retail | 2025 |
| Cynthia Agyeman Consulting Ltd | Professional & scientific | 2025 |
| Cynthia Care Services Ltd | Health & social care | 2019 |
| Cynthia Murphy Limited | Arts & recreation | 2023 |
| Cyntra Systems Ltd | Information & communication | 2023 |
| Cyonex Ltd | Information & communication | 2025 |
| CYP Group Limited | Administrative & support | 2023 |
| Cypress Care Ltd | Real estate | 2025 |
| Cypresshawk Limited | Real estate | 2015 |
| Cypriana Consulting Limited | Professional & scientific | 2024 |
| Cyril Murphy Ltd | Wholesale & retail | 2025 |
| Cyrrus SM Ltd | Professional & scientific | 2024 |
| Cyrus Lodges Ltd | Real estate | 2025 |
| Cysiam Limited | Professional & scientific | 2018 |
| Cytix Ltd | Information & communication | 2022 |
| Cytology Partner Ltd. | Health & social care | 2013 |
| Cytotrait Limited | Professional & scientific | 2023 |
| Cytox Limited | Professional & scientific | 2004 |
| Cyvanta IT Solutions Ltd | Information & communication | 2025 |
| Cyvek Cleaning Limited | Administrative & support | 2018 |
| CZ Social Limited | Professional & scientific | 2025 |
| Czech Invest A.S. Limited | Real estate | 2020 |
| Czech Services Ltd | Hospitality | 2022 |
| Czech the Music Events Ltd | Arts & recreation | 2025 |
| CZJ Group Ltd | Wholesale & retail | 2024 |
| Czok Holdings Limited | Administrative & support | 2017 |
| Czweisg Ltd | Wholesale & retail | 2025 |
| Côte Verano Ltd | Wholesale & retail | 2026 |
| D & a Design (Manchester) Ltd | Construction | 2016 |
| D & a Estates Limited | Other services | 1987 |
| D & a GAS Plumbing Limited | Construction | 2020 |
| D & B Computer Services Limited | Manufacturing | 2002 |
| D & B Property Solutions Ltd | Real estate | 2018 |
| D & B Residential Ltd | Real estate | 2019 |
| D & C Autos (NW) Ltd | Wholesale & retail | 2023 |
| D & C Smith T/A Contact Northwest Properties Limited | Real estate | 2014 |
| D & D Gorton Ltd | Hospitality | 2025 |
| D & D UK Logistics Ltd | Transport & logistics | 2021 |
| D & DEC Ltd | Transport & logistics | 2025 |
| D & G Mckenna Haulage Limited | Transport & logistics | 2004 |
| D & H Estates (NO. 3) Limited | Professional & scientific | 2013 |
| D & H Estates (NO.2) Limited | Real estate | 2012 |
| D & H Plastering Ltd | Construction | 2024 |
| D & H Property Holdings Limited | Real estate | 2018 |
| D & I Auto Care Limited | Wholesale & retail | 2026 |
| D & J Clothing Ltd | Manufacturing | 2017 |
| D & J Holdco Limited | Financial services | 2026 |
| D & J Kiff Ltd | Construction | 2007 |
| D & J Marshall Agricultural Services Limited | Financial services | 2002 |
| D & K (UK Company) Limited | Other services | 2020 |
| D & K Legal Services Ltd | Other services | 2018 |
| D & L Nails Spa Ltd | Other services | 2024 |
| D & L Procurement Services Limited | Professional & scientific | 2012 |
| D & M Barbers Ltd | Other services | 2022 |
| D & M Mechanical Services Limited | Construction | 2000 |
| D & M Motorcare Ltd | Wholesale & retail | 2018 |
| D & M Property Holdings Limited | Real estate | 2018 |
| D & N Autos Limited | Wholesale & retail | 2024 |
| D & O Plumbing Limited | Construction | 2012 |
| D & P Construction Limited | Construction | 2009 |
| D & R Windows Ltd | Construction | 2019 |
| D & S Contractors Ltd | Construction | 2026 |
| D & S Fuels Limited | Wholesale & retail | 2003 |
| D & S Woods Ltd | Real estate | 2017 |
| D & T Assets Limited | Real estate | 2014 |
| D & Z Optics Ltd | Health & social care | 2012 |
| D a Languages Limited | Professional & scientific | 2007 |
| D a Property (North West) Limited | Other services | 2015 |
| D a Wilson Limited | Construction | 2002 |
| D Adshead Properties Limited | Real estate | 2025 |
| D and a Joinery Ltd | Manufacturing | 2021 |
| D and C Scan Deliveries Limited | Transport & logistics | 2024 |
| D and D Serene Properties Limited | Real estate | 2022 |
| D and I Upvc Windows Ltd | Manufacturing | 2011 |
| D and J Ward Property Solutions Ltd | Real estate | 2024 |
| D Andrew Investments Limited | Professional & scientific | 2025 |
| D B Civils Engineering Limited | Construction | 2024 |
| D B Connected Ltd | Administrative & support | 2023 |
| D B Landscapes Limited | Administrative & support | 2014 |
| D B Levine Limited | Administrative & support | 2009 |
| D Best Services Limited | Wholesale & retail | 2025 |
| D Bradley Limited | Arts & recreation | 2004 |
| D Cleary Building and Property Maintenance Limited | Construction | 2006 |
| D D Consultants Limited | Manufacturing | 1991 |