| Carol Sadler Lighting Limited | Other services | 2010 |
| Carry/Fwd Limited | Professional & scientific | 2016 |
| Carter Vallance Holdings Limited | Real estate | 2024 |
| Cassius & Co Ltd | Administrative & support | 2014 |
| Castle Gerard Limited | Real estate | 2018 |
| Catbird Seat Ltd | Professional & scientific | 2026 |
| Catfish Lifestyles Ltd | Administrative & support | 2014 |
| Catherine Road Management Company Limited | Real estate | 1984 |
| Cave Productions Limited | Information & communication | 1997 |
| CDG Consulting Ltd | Professional & scientific | 2008 |
| CDR Electrical Supplies Limited | Wholesale & retail | 2014 |
| CDR Electrical Wholesalers Limited | Wholesale & retail | 2007 |
| CEJ Legacy Ltd | Extraterritorial | 2017 |
| Cenholt Ltd | Real estate | 2015 |
| Central and Residential Properties Limited | Real estate | 1960 |
| Centric Park (Longmoor) Management Company Limited | Households | 2026 |
| Century Court (Teddington) Residents Association Limited | Households | 1969 |
| Certifieds Roofing Ltd | Construction | 2025 |
| Chalford Property Company Limited | Real estate | 1994 |
| Chalmers Freehold Limited | Households | 2020 |
| Chalmers House Limited | Households | 1984 |
| Chalmers Painting & Decorating Limited | Construction | 2004 |
| Champion Travel Limited | Real estate | 1958 |
| Charles Irvine Capital Limited | Real estate | 2014 |
| Charles Irvine Group LLP | | 2020 |
| Charles Irvine IP Ltd | Financial services | 2021 |
| Charles Irvine Real Estate Limited | Real estate | 2016 |
| Charmweald Limited | Construction | 2006 |
| Chart Hits Limited | Arts & recreation | 2023 |
| Chase Hospice Trading Limited | Information & communication | 1997 |
| Chef & Chef Ltd | Hospitality | 2025 |
| Chell Systems Limited | Information & communication | 2024 |
| Chen & Co Limited | Real estate | 2014 |
| Chen & Partners Ltd | Extraterritorial | 2018 |
| Chestnut Court (the Lakes Business Park) Management Company Limited | Real estate | 2020 |
| Chicken Wills Limited | Professional & scientific | 2011 |
| Chile Energy Holdings Ltd | Professional & scientific | 2018 |
| Chile Midco Falcon Ltd | Extraterritorial | 2021 |
| Chillax London Limited | Other services | 2010 |
| Chinos Cafe Limited | Hospitality | 2023 |
| CHM Investments Limited | Real estate | 2018 |
| Chris Deakin Associates Limited | Professional & scientific | 2011 |
| Chris Knoll Limited | Information & communication | 2011 |
| Chris Soane Building Services Ltd | Construction | 2013 |
| Chris Warrens Tribology Ltd | Professional & scientific | 2025 |
| Chrissallan Property Ltd | Real estate | 2025 |
| Christian LEE Ltd | Wholesale & retail | 2024 |
| Chromatopia Ltd | Arts & recreation | 2014 |
| Chronically Marvellous Community Interest Company | Public administration | 2023 |
| CHRYSTALCARE899COMPANYLTD Ltd | Extraterritorial | 2020 |
| Chugh Properties Ltd | Extraterritorial | 2015 |
| Churros OLE Ltd | Hospitality | 2015 |
| Cirowand Limited | Other services | 1979 |
| Ciso Mentor Ltd | Information & communication | 2019 |
| City Flooring Ltd | Other services | 2017 |
| CJA Care Limited | Health & social care | 2021 |
| CK Private Clinic Limited | Health & social care | 2012 |
| Clarify Exterior Cleaning Limited | Administrative & support | 2024 |
| Claydon Homes Ltd | Construction | 2023 |
| Clear Plumbing Limited | Construction | 2013 |
| Clearpoint Insight Ltd | Professional & scientific | 2023 |
| Cleve Land Surbiton Limited | Households | 2006 |
| Click & Connect Marketing Limited | Professional & scientific | 2020 |
| Clickgrowth Ltd | Professional & scientific | 2023 |
| Client Focus Associates Ltd | Information & communication | 2013 |
| Clinton House (Surbiton) Residents Association Limited | Households | 1964 |
| Clocktower Investments Limited | Other services | 1996 |
| Cloud Capital Holdco Limited | Financial services | 2024 |
| Cloudbreak Spirits Limited | Wholesale & retail | 2014 |
| Clover House Properties Limited | Real estate | 2019 |
| Clover Property Solutions Limited | Real estate | 2016 |
| Clubhouse Inn Limited | Administrative & support | 2002 |
| Cmsquared Properties Ltd | Real estate | 2017 |
| CNB Records Limited | Information & communication | 2026 |
| Coba Design Ltd | Professional & scientific | 2015 |
| Codehb Limited | Information & communication | 2011 |
| COL J Smith Construction Ltd | Construction | 2013 |
| Colours Carnival MAS Limited | Arts & recreation | 2022 |
| COM23 Limited | Professional & scientific | 2018 |
| Comcraft Services Limited | Professional & scientific | 1964 |
| Comeragh Road Freehold Limited | Households | 2006 |
| Comley Holdings Ltd | Real estate | 2015 |
| Commonmind Ltd | Health & social care | 2025 |
| Compass 122 Limited | Financial services | 2020 |
| Compassionate Leadership Academy Limited | Professional & scientific | 2015 |
| Compassionately Authentic Limited | Other services | 2020 |
| Compufast Software Limited | Information & communication | 1989 |
| Conduit Management International Limited | Administrative & support | 2004 |
| Conifers (Weybridge) Residents Association Limited | Households | 1967 |
| Conix Ltd | Information & communication | 2026 |
| Conjoint Export Services (Near East) Limited | Wholesale & retail | 1966 |
| Connie Gray Limited | Wholesale & retail | 2015 |
| Consalia Limited | Administrative & support | 1998 |
| Conscious Lemons Ltd | Wholesale & retail | 2020 |
| Construction Site Services (CSS) Ltd | Construction | 2025 |
| Coolbellup Investments Ltd | Extraterritorial | 2016 |
| Corgi Partners Ltd | Real estate | 2015 |
| Corico Limited | Arts & recreation | 2019 |
| Cormorant Consultant Services Limited | Professional & scientific | 2021 |
| Corner 2020 Limited | Other services | 2017 |