| Ccbc Ltd | Construction | 2025 |
| Ccsa Ltd | Education | 2026 |
| CD Partners Limited | Other services | 2018 |
| CD Sunscreens Ltd | Manufacturing | 2018 |
| CDM Building Company Ltd | Construction | 2025 |
| Cdmm Healthcare Ltd | Health & social care | 2020 |
| CDR IC Layout Design Ltd | Information & communication | 2024 |
| CEA Global Ventures Ltd | Manufacturing | 2023 |
| CEA Marketing Limited | Professional & scientific | 2024 |
| Ceba Property Ltd | Real estate | 2024 |
| Ceboe Ltd | Health & social care | 2023 |
| Cece CHA Ltd | Hospitality | 2026 |
| Cedar Court (ST Albans) Limited | Households | 2008 |
| Cedar Dell Residents Limited | Real estate | 2004 |
| Cedars (Stevenage) Management Company Limited(The) | Households | 1976 |
| Ceejay (Stevenage) Limited | Construction | 2012 |
| CEF Legal LLP | | 2020 |
| Celebriducks Limited | Administrative & support | 2015 |
| Celestial Leaves Ltd | Wholesale & retail | 2025 |
| Cemson Logistics Ltd | Transport & logistics | 2019 |
| Central Drive Limited | Information & communication | 1990 |
| Centre for Commercialisation Ltd | Professional & scientific | 2024 |
| Centrepiece Cakes Ltd | Manufacturing | 2024 |
| Century Watch Repairs Ltd | Other services | 2021 |
| Century Watches Limited | Wholesale & retail | 2025 |
| Ceramixx Ltd | Wholesale & retail | 2025 |
| Cerberus Environmental Services Ltd | Construction | 2021 |
| Cerberus UK Logistics Ltd | Transport & logistics | 2020 |
| Cerberus UK Support Services Ltd | Administrative & support | 2019 |
| Cerebro CMC Limited | Professional & scientific | 2017 |
| Certeco Renewables Ltd | Construction | 2018 |
| Cezara Dixie Florin Ltd | Real estate | 2025 |
| CFS Events Limited | Administrative & support | 2002 |
| CFS Scaffolding Ltd | Construction | 2017 |
| CG Landscapers Limited | Construction | 2010 |
| CGH LDN Ltd | Other services | 2023 |
| Cgs-Ne Estates Ltd | Other services | 2022 |
| CHA Kulcha Ltd | Hospitality | 2024 |
| Chadwell Court (Ware) Management Company Limited | Households | 1986 |
| Chalfont Court Consultants Limited | Real estate | 2008 |
| Chalkley Skinner Scaffolding Limited | Construction | 2017 |
| Challenge Electronics Limited | Manufacturing | 1995 |
| Challo Holdings Limited | Information & communication | 2019 |
| Chanancy Ltd | Other services | 2019 |
| Chandelier Services Ltd | Administrative & support | 2026 |
| Chandlers Group Limited | Financial services | 2024 |
| Chandlers Independent Estate Agents Limited | Real estate | 2003 |
| Change IS Happening Limited | Other services | 2018 |
| Change MAN Consulting Ltd | Information & communication | 2019 |
| Chantry House SPV Limited | Other services | 2022 |
| Chapmore END Management Company Limited(The) | Households | 1986 |
| Characters Signs Ltd | Administrative & support | 2006 |
| Chariots Cars Romford Ltd | Wholesale & retail | 2021 |
| Charley Nouveau Ltd | Administrative & support | 2016 |
| Charlie Baker Productions Ltd | Arts & recreation | 2011 |
| Charlie Luxe Vintage Ltd | Wholesale & retail | 2020 |
| Charlie Note Ltd | Health & social care | 2025 |
| Charlotte Hanson Associates Limited | Professional & scientific | 2022 |
| Charlotte House Freeholders Limited | Households | 2010 |
| Charlotte House Management Limited | Households | 1986 |
| Charlotte Taylor London Laser Specialist Limited | Administrative & support | 2026 |
| Charlotte Taylor Permanent Makeup Limited | Other services | 2023 |
| Charnia Consultants Limited | Professional & scientific | 2011 |
| Charters Hooper Property Management Limited | Households | 2023 |
| Chartwell Contractors Limited | Construction | 2014 |
| Chatben Ltd | Health & social care | 2013 |
| Chatsworth Court Management Company (ST. Albans) Limited | Households | 1988 |
| Chatterjee Limited | Information & communication | 2019 |
| Chatting Breeze Limited | Wholesale & retail | 2013 |
| Chaucer Close Management Company Limited | Households | 2008 |
| Chay Fallows Training Systems Limited | Other services | 2022 |
| Check the Gate Ltd | Information & communication | 2024 |
| Cheese Pizza Oaks Cross Ltd | Hospitality | 2023 |
| Chegireddy Services Limited | Real estate | 2015 |
| Chells Cafe Ltd | Hospitality | 2019 |
| Chells Way Local Ltd | Wholesale & retail | 2022 |
| Chelsea and Westminster Estates Ltd | Real estate | 2023 |
| Chelsea Nails Studio Ltd | Other services | 2025 |
| Chemical Solution Supplies Limited | Wholesale & retail | 2016 |
| Chemical Solutions International Limited | Administrative & support | 2026 |
| Chens Discus Ltd | Wholesale & retail | 2024 |
| Cherished Buildings Limited | Construction | 2015 |
| Cherithcane Limited | Professional & scientific | 1983 |
| Chessington Mansions Management Limited | Real estate | 1995 |
| Chesterman Homes Swansea Limited | Real estate | 2017 |
| Chesters Retail Group Limited | Wholesale & retail | 2025 |
| Chestnut Grove (Westcroft) Management Company Limited | Households | 2005 |
| Chiara Scenic Art Limited | Arts & recreation | 2025 |
| Chilcote Catering Ltd | Hospitality | 2019 |
| Child Psychiatry Clinic Limited | Health & social care | 2022 |
| Chiltern Moves Limited | Transport & logistics | 2011 |
| Chilton Products and Services Limited | Professional & scientific | 2022 |
| Chines Express Stevenage Ltd | Hospitality | 2026 |
| Chloe Brockett Ltd | Professional & scientific | 2020 |
| Chloe Jenkin Pilates Ltd | Other services | 2024 |
| Choke on Laughter Ltd | Information & communication | 2026 |
| Cholco Consulting Limited | Professional & scientific | 2005 |
| CHR Property Services Limited | Real estate | 2022 |
| Chris Day Inclusion Limited | Education | 2022 |
| Chris Foster Limited | Construction | 2012 |