| Cleaning With Prestige Limited | Administrative & support | 2024 |
| Clear View Tech Limited | Manufacturing | 2012 |
| Clearaway Asbestos Services Limited | Administrative & support | 2016 |
| Clearem Ltd | Wholesale & retail | 2025 |
| Clever Rooms Ltd | Information & communication | 2019 |
| Clickon IT London Ltd | Information & communication | 2006 |
| Clock Enterprise Ltd. | Administrative & support | 2006 |
| Clock Tower Cars UK Limited | Transport & logistics | 2000 |
| Clock.Health Ltd | Professional & scientific | 2026 |
| Clownfish Events Ltd | Information & communication | 2009 |
| CNM Estates (Tolworth Broadway) Limited | Construction | 2016 |
| Cobham Roofing Ltd | Construction | 2025 |
| Cobra Stationery Limited | Manufacturing | 2012 |
| Cobrien Services Limited | Construction | 2011 |
| Cocino Ltd | Wholesale & retail | 2021 |
| Coco TAN Sunbeds Ltd | Other services | 2018 |
| Coco.Thoronton Ltd | Hospitality | 2025 |
| Coco.Tolworth Ltd | Hospitality | 2024 |
| Cognispire Ltd | Information & communication | 2025 |
| Collins & Steel Bespoke Spray Painting Ltd | Construction | 2023 |
| Collins and Smith Bespoke Decorating Services Ltd | Construction | 2025 |
| Colour MAX Limited | Manufacturing | 2010 |
| Comfort Care at Home Limited | Health & social care | 2017 |
| Comnet Digital Limited | Information & communication | 2024 |
| Complete Heating and GAS Ltd | Construction | 2013 |
| Compressed Air Centre Industrial Utility Management Ltd | Manufacturing | 2025 |
| Compressed Air Centre Limited | Manufacturing | 1992 |
| Compressed Air Group Ltd | Manufacturing | 2025 |
| Condere Ltd | Transport & logistics | 2023 |
| Coniston Court Residents' Association Limited | Households | 1959 |
| Constelcom Ltd | Information & communication | 2013 |
| Contraband Audio Limited | Information & communication | 2012 |
| Contractor Expert Group Ltd | Administrative & support | 2025 |
| Controlux Limited | Construction | 2003 |
| Cooper Gray Ltd | Real estate | 2026 |
| Corporate Solutions Insight Limited | Professional & scientific | 2016 |
| Cort Business Services UK Limited | Wholesale & retail | 2007 |
| Costa Global Ltd | Real estate | 2025 |
| Cosy Flooring Ltd | Construction | 2012 |
| Cplbiz Limited | Administrative & support | 2026 |
| CPS Property Ventures Limited | Real estate | 2026 |
| Craftmax Limited | Wholesale & retail | 2012 |
| Cranleigh Management Co Limited | Households | 1980 |
| CRB Property Services (Surrey) Limited | Construction | 2016 |
| CRC Trades Limited | Wholesale & retail | 2023 |
| Creatif Wall Limited | Construction | 2023 |
| Creative Design and Development Ltd | Construction | 2025 |
| Creative Park London Limited | Professional & scientific | 2010 |
| Creative Philip Ltd | Professional & scientific | 2020 |
| Creative Wallpaper Limited | Manufacturing | 2021 |
| Crestaville Limited | Health & social care | 2005 |
| Crew on Call Ltd | Administrative & support | 2025 |
| Croft Scaffolding & Rigging Ltd | Construction | 2026 |
| Croton Security Ltd | Construction | 2023 |
| Cryptopt Ltd | Education | 2021 |
| Crystal View Homes Limited | Construction | 2024 |
| Crystalvox Ltd | Manufacturing | 2017 |
| CS Gardens ( Surrey ) Ltd | Administrative & support | 2022 |
| Cupcards Limited | Extraterritorial | 2018 |
| Currentflow Electrical Ltd | Construction | 2025 |
| Cutetonic Ltd | Wholesale & retail | 2015 |
| CW & DH Limited | Hospitality | 2025 |
| Cyber Bridge Mena Ltd | Information & communication | 2024 |
| D & F (Managements) Limited | Households | 1964 |
| D & F Holdings Limited | Households | 2002 |
| D Hickman Limited | Administrative & support | 2025 |
| D&L Cleaners Ltd | Administrative & support | 2026 |
| D.E.A.P. Healing Ltd | Health & social care | 2018 |
| D.P. Medical Systems Limited | Wholesale & retail | 1987 |
| D.S. Logistics U.K. Ltd. | Administrative & support | 2003 |
| Daannis Group Ltd | Wholesale & retail | 2025 |
| Dakata Limited | Wholesale & retail | 2019 |
| Dalbiac Associates Limited | Administrative & support | 2016 |
| Dancestars Limited | Education | 2005 |
| Dapaah International Group Limited | Arts & recreation | 2017 |
| Dapple Plants Ltd | Agriculture & fishing | 2025 |
| Darley Equestrian Ltd | Wholesale & retail | 2011 |
| Dave PAY Ltd | Administrative & support | 2022 |
| David & Lucias Removals Ltd | Water & waste | 2021 |
| Dawson's Plumbing Services Ltd | Construction | 2020 |
| DCR Maintenance Services Ltd | Construction | 2025 |
| Deadman Property Solutions Ltd | Construction | 2023 |
| Deer Holdings Ltd | Real estate | 2019 |
| Demon Run Ltd | Information & communication | 2025 |
| Dent RPA Ltd | Professional & scientific | 2012 |
| Dental Resale Ltd | Wholesale & retail | 2020 |
| Dental Stock X-Change Ltd | Information & communication | 2010 |
| Dentpulse Limited | Information & communication | 2025 |
| Deskontao Ltd | Wholesale & retail | 2022 |
| Destiny Building Services Ltd | Construction | 2014 |
| DEV & Shresta Limited | Information & communication | 2019 |
| Dezbira Ltd | Real estate | 2019 |
| Di&V Limited | Professional & scientific | 2021 |
| Diamand Paving Ltd | Construction | 2017 |
| Diamond Fabrics Ltd | Wholesale & retail | 2021 |
| Diamond Media Entertainment Limited | Information & communication | 2021 |
| Didy Investments Limited | Wholesale & retail | 2009 |
| Digico Limited | Extraterritorial | 2013 |
| Digico UK Limited | Manufacturing | 2001 |
| Digisol Technologies Ltd | Information & communication | 2023 |