| Cherry Tree Corner Limited | Real estate | 2024 |
| Chestnut Products (Finishes) Ltd | Wholesale & retail | 2019 |
| Cheungsfield Grove Ltd | Financial services | 2022 |
| Cheyenne Consultants Limited | Professional & scientific | 2021 |
| Chisquare Labs Limited | Information & communication | 2024 |
| Chloe Sandra Limited | Wholesale & retail | 2025 |
| Chris Dudley Limited | Transport & logistics | 2009 |
| Chris Unique Construction Ltd | Construction | 2020 |
| Churchill Cigars Limited | Wholesale & retail | 2024 |
| Cinevents Limited | Arts & recreation | 2016 |
| Cinnamon Ruba Restaurant Ltd | Hospitality | 2025 |
| Circle Barbers Ltd | Other services | 2021 |
| Circlepizzapizza Carshalton Ltd | Hospitality | 2025 |
| Citus Accounting Ltd | Professional & scientific | 2020 |
| City Translations Limited | Professional & scientific | 2013 |
| Civil and Suds Solutions Limited | Construction | 2022 |
| Clargent Limited | Professional & scientific | 2005 |
| Classic Tiling London Ltd | Construction | 2012 |
| Classical JR Cloud Ltd | Households | 2016 |
| Classical Property Services Ltd. | Households | 2001 |
| Cleave Prior Residents Limited | Households | 2015 |
| Clerk Capital Services Ltd | Information & communication | 2019 |
| CLG Productions Limited | Administrative & support | 2024 |
| Clockwise Cars Ltd | Transport & logistics | 2023 |
| Cloudthread Consulting Limited | Information & communication | 2026 |
| CLW Glass & Glazing Ltd | Construction | 2020 |
| Codesauce Limited | Information & communication | 2016 |
| Codeval Limited | Information & communication | 2024 |
| Cold Freez Ltd | Construction | 2023 |
| Coleman’S Leadwork and Roofing Ltd | Construction | 2025 |
| Collar Links Limited | Professional & scientific | 2025 |
| Collins Chemical Blacking Limited | Manufacturing | 2009 |
| Commoditrade Limited | Wholesale & retail | 2010 |
| Compassionate Health Care Services Limited | Health & social care | 2012 |
| Comtra Limited | Professional & scientific | 2018 |
| Concepts Alliance Ltd | Professional & scientific | 2011 |
| Connectmental Limited | Health & social care | 2023 |
| Connor Smither Music Ltd | Arts & recreation | 2025 |
| Conrad FOX LLP | | 2015 |
| Consciouz Eats Ltd | Health & social care | 2025 |
| Constructsents Limited | Construction | 2016 |
| Contestore Ltd | Wholesale & retail | 2024 |
| Copper Top Plumbing Limited | Construction | 2008 |
| Cosy Cottage Daycare Ltd | Health & social care | 2022 |
| Courtmel Limited | Health & social care | 2021 |
| Coyi Ltd | Professional & scientific | 2025 |
| CP Midcare Ltd | Health & social care | 2022 |
| CR11 Ltd | Hospitality | 2017 |
| Creation Consulting Ltd | Professional & scientific | 1999 |
| Creation Training Ltd | Professional & scientific | 2001 |
| Creative Materials Consultants Limited | Professional & scientific | 2012 |
| Creative Materials Technologies Limited | Information & communication | 2017 |
| Creative Tech Limited | Information & communication | 2013 |
| Crescent Beauty Bar Ltd | Other services | 2022 |
| Cruz Construct Ltd | Construction | 2019 |
| Cryerarts Ltd | Hospitality | 2018 |
| Crystal Convenience Store Limited | Wholesale & retail | 2025 |
| Cs.Mg Catering Ltd | Hospitality | 2023 |
| CT Psychiatric Consultancy Limited | Health & social care | 2024 |
| CTP Property Limited | Real estate | 2015 |
| Cuke Consulting Ltd | Information & communication | 2015 |
| Cullens Services Limited | Administrative & support | 2017 |
| Curry House Carshalton Ltd | Hospitality | 2026 |
| Custom Plates London Ltd | Wholesale & retail | 2025 |
| Cyber Compliance Hub Ltd | Information & communication | 2025 |
| Cyclo Consulting Limited | Professional & scientific | 2009 |
| Cygnus Homes Limited | Real estate | 2024 |
| D G Inc Ltd | Real estate | 2024 |
| D J N K Properties Ltd | Real estate | 2024 |
| D&J Renovation Ltd | Construction | 2019 |
| D&K Capital Management Limited | Real estate | 2016 |
| D4SNETWORK Limited | Financial services | 2022 |
| DADIVAS4 Ltd | Health & social care | 2021 |
| Daedal Research LLP | | 2025 |
| Daedalus Avioaero Ltd | Professional & scientific | 2019 |
| Dailyprofitpips Limited | Other services | 2012 |
| Daley Motion Transport Ltd | Transport & logistics | 2026 |
| Damson FOX Limited | Health & social care | 2020 |
| DAN37 Ltd | Construction | 2010 |
| Danscapes Ltd | Administrative & support | 2024 |
| Dansil UK Ltd | Other services | 2018 |
| Dara Sevim Catering Ltd | Hospitality | 2024 |
| Dark Angel Recovery Ltd | Transport & logistics | 2023 |
| Daryani Limited | Health & social care | 2013 |
| DAS Infotech Limited | Information & communication | 2009 |
| Dasguru Ltd | Wholesale & retail | 2018 |
| Databage Solutions Ltd | Information & communication | 2022 |
| Davebc Ltd | Construction | 2026 |
| Daya Motor Engineers Company (Private) Limited | | 2004 |
| DC Music Ltd | Arts & recreation | 2018 |
| DC Services Construction Ltd | Construction | 2026 |
| Dcloud Consulting Limited | Information & communication | 2017 |
| DE Novo - Architecture Limited | Construction | 2004 |
| DE SMS Construction Ltd | Construction | 2020 |
| Debtfree Solutions Direct Limited | Professional & scientific | 2004 |
| Deco Art London Ltd | Construction | 2021 |
| Deepa NS Ltd | Health & social care | 2013 |
| Deepcloud Ltd. | Information & communication | 2017 |
| Defiant Technologies Ltd | Professional & scientific | 2025 |
| DEL Logistic Ltd | Transport & logistics | 2017 |