| Copper Box Vintage Ltd | Wholesale & retail | 2023 |
| Copperton Ltd | Professional & scientific | 2025 |
| Corcoran Technical Services Ltd | Professional & scientific | 2026 |
| Core 6 Studios Ltd | Arts & recreation | 2025 |
| Core Connect Pilates Ltd | Arts & recreation | 2010 |
| Coromandel Coast Limited | Manufacturing | 2017 |
| Corvaglia's Ltd | Wholesale & retail | 2025 |
| Corvus Digital Limited | Information & communication | 2022 |
| Coulsdon Barber Ltd | Other services | 2015 |
| Coulsdon Carpentry Ltd | Construction | 2025 |
| Coulsdon Developments Limited | Hospitality | 2015 |
| Coulsdon Home Hardware Limited | Wholesale & retail | 2014 |
| Coulsdon Kitchen Ltd | Hospitality | 2023 |
| Coulsdon Lane Management Company Ltd | Households | 2009 |
| Coulsdon Sandwiches Ltd | Hospitality | 2023 |
| Coulsdon Spice Ltd | Hospitality | 2025 |
| Courthill House Healthcare Limited | Health & social care | 2019 |
| Courtyard Guildford Limited | Wholesale & retail | 2010 |
| Covershot Ltd | Professional & scientific | 2009 |
| Cowan BNB Ltd | Hospitality | 2025 |
| Cozy Glow Ltd. | Manufacturing | 2015 |
| Cozy Nest - SAG Ltd | Real estate | 2025 |
| Cozyshutterco Ltd | Manufacturing | 2021 |
| CR5 Pizza Ltd | Hospitality | 2025 |
| Craig Reynolds Limited | Transport & logistics | 2003 |
| Crazon Limited | Information & communication | 2021 |
| CRB Consults Ltd | Professional & scientific | 2025 |
| Creams LDN Ltd | Hospitality | 2018 |
| Creating Community Facilities | Health & social care | 2003 |
| Creative Leadwork and Roofing Ltd | Construction | 2022 |
| Crediba Limited | Information & communication | 2007 |
| Creighton Coaching Ltd | Professional & scientific | 2021 |
| Crescendo Electrical Services Ltd | Energy | 2016 |
| Crest Development Group Ltd | Construction | 2023 |
| CRO Developments Ltd | Construction | 2025 |
| Cross Country (Trading) Limited | Transport & logistics | 2018 |
| Crown Investigations & Collection Limited | Administrative & support | 2024 |
| Croydon Electrician Ltd | Construction | 2024 |
| Croydon Football Club Limited | Arts & recreation | 2011 |
| Croylek Limited | Manufacturing | 1964 |
| Crystal Clean Ventures Ltd | Administrative & support | 2024 |
| Crystal Clear Consulting Group Limited | Professional & scientific | 2025 |
| Crystal Cloud Consulting Ltd | Information & communication | 2012 |
| CS Vaporizers Limited | Wholesale & retail | 2016 |
| CTN Holdings Ltd | Professional & scientific | 2025 |
| Cuppa Haven Trading Ltd | Hospitality | 2018 |
| Curans Care Limited | Health & social care | 2002 |
| Curry Kitchen Coulsdon Ltd | Hospitality | 2025 |
| Custom Curve Decking Limited | Manufacturing | 2021 |
| Cyrus Associates Limited | Information & communication | 2018 |
| D & F Home Improvement Ltd | Construction | 2019 |
| D & I System Ltd | Information & communication | 2016 |
| D & L B Holdings Ltd | Real estate | 2025 |
| D & L B Services Limited | Construction | 2015 |
| D L Booty Consultancy Limited | Professional & scientific | 2015 |
| D&P Home Improvements Ltd | Construction | 2025 |
| D-Labs-Tech.Ai Ltd | Information & communication | 2025 |
| D.C.Consultancy (Surrey) Ltd | Professional & scientific | 2013 |
| D.D. Rock Limited | Health & social care | 2001 |
| Daaku Consulting Group Ltd | Education | 2025 |
| Daksh Consulting Limited | Information & communication | 2005 |
| Daksta Limited | Administrative & support | 2014 |
| Damian Speed Limited | Transport & logistics | 2025 |
| DAN Investments Holdings Ltd | Real estate | 2024 |
| Daniel Adams Estate Agents Limited | Real estate | 2007 |
| Daniel Adams Letting & Management Limited | Real estate | 2009 |
| Daniel Adams Properties Limited | Real estate | 2024 |
| Daniel Macdiarmid Plumbing & Building Services Ltd | Construction | 2025 |
| Danjas Limited | Administrative & support | 2015 |
| Danm Limited | Wholesale & retail | 2011 |
| DAR Real Estate Ltd | Real estate | 2022 |
| Dardan Pubs Limited | Real estate | 2016 |
| Dardan Two Limited | Extraterritorial | 2016 |
| DAS Imperial Solutions Ltd | Wholesale & retail | 2018 |
| Dassom Ltd | Information & communication | 2025 |
| Data Dividends Ltd | Professional & scientific | 2023 |
| Davelle Ventures Ltd | Health & social care | 2020 |
| Day Bespoke Carpentry Limited | Manufacturing | 2024 |
| Daydream Lettings Ltd | Real estate | 2023 |
| DBP Energy Investments Ltd | Other services | 2018 |
| DE Rocco Ltd | Construction | 2020 |
| DE Ultimate Health Care Services Ltd | Health & social care | 2020 |
| Deborahchildminding Ltd | Education | 2024 |
| Decorators Jobs Ltd | Professional & scientific | 2025 |
| Dedan Nadrowixi Ltd | Real estate | 2012 |
| Deko Construction and Decoration Ltd | Construction | 2021 |
| Deko Services Ltd | Construction | 2021 |
| Demir's Cafe Ltd | Hospitality | 2024 |
| Demotivational Designs Ltd | Wholesale & retail | 2025 |
| Dependable Services Ltd | Manufacturing | 2023 |
| Dermis Clinic Ltd | Health & social care | 2014 |
| Dermis Estates Ltd | Real estate | 2020 |
| Dermis Holding Limited | Real estate | 2020 |
| Dermis Skin Aesthetics Limited | Health & social care | 2016 |
| DES Renewable Energy Limited | Construction | 2022 |
| Design Build 4U Ltd | Construction | 2020 |
| DGN Global Ltd | Wholesale & retail | 2021 |
| Dhamma Compassionate Housing Ltd | Construction | 2023 |
| DICTIONARY4LIFE C.I.C. | Education | 2025 |
| Digright Ltd | Professional & scientific | 2022 |