| C3IA Technologies Ltd | Information & communication | 2023 |
| Caan Consultancy Limited | Transport & logistics | 2014 |
| Cable Management Systems Limited | Information & communication | 1997 |
| Cacoyannis Limited | Information & communication | 2024 |
| Cactus Beats Limited | Information & communication | 2021 |
| Cadart Engineering Ltd | Professional & scientific | 2016 |
| Caddy Digital Ltd | Information & communication | 2026 |
| Cadence Distribution Limited | Construction | 2015 |
| Cadence Event Solutions Ltd | Arts & recreation | 2024 |
| Cadernid Psychology Ltd | Education | 2024 |
| Cadlay Designs Limited | Professional & scientific | 1987 |
| Cadme Limited | Other services | 2014 |
| Caela Ltd | Professional & scientific | 2025 |
| Caesar Drainage Services Ltd. | Water & waste | 2025 |
| Cafe 25 Ltd | Hospitality | 2022 |
| Cafe Amore Restaurant & Bar Limited | Hospitality | 2025 |
| Cafe by JO Ltd | Hospitality | 2023 |
| Cafe Caballero Ltd | Hospitality | 2019 |
| Cafe Fresh Limited | Hospitality | 2017 |
| Cafe Nice Limited | Hospitality | 2020 |
| Caffeine Hub Ltd | Hospitality | 2022 |
| CAG (UK) Limited | Manufacturing | 1999 |
| Cairn Trading Limited | Professional & scientific | 2024 |
| Cakeies Ltd | Manufacturing | 2024 |
| Caldair Creative Ltd | Information & communication | 2021 |
| Caldax Holdings One Ltd | Real estate | 2024 |
| Caldax Holdings Two Ltd | Real estate | 2025 |
| Calder 4 Ltd | Real estate | 2025 |
| Caleb Development Limited | Construction | 2003 |
| Cali Express Ltd | Hospitality | 2025 |
| California Express Foods Ltd | Hospitality | 2026 |
| California Fast Food Ltd | Hospitality | 2025 |
| Callender Designs Limited | Manufacturing | 1999 |
| Calltoadventure Ltd | Administrative & support | 2019 |
| Calm Construction Ltd | Construction | 2019 |
| Calmnous Ltd | Education | 2025 |
| CAM Motors (Poole) Limited | Wholesale & retail | 2011 |
| Cambitas Investments Limited | Financial services | 2025 |
| Cambitas Limited | Professional & scientific | 2023 |
| Cambrevi Global Limited | Wholesale & retail | 2025 |
| Cambridge Solutions Limited | Information & communication | 1992 |
| CAMBRIDGEHAUX01 Limited | Real estate | 2025 |
| Camel Market Limited | Wholesale & retail | 2025 |
| Cameleer Properties Limited | Construction | 1964 |
| Camelford Court Freehold Limited | Households | 1999 |
| Camellia Therapies Ltd | Health & social care | 2025 |
| Campaign Cooperative Limited | Professional & scientific | 2023 |
| Campervan Comfort Limited | Wholesale & retail | 2024 |
| CAN 11 Architects Ltd | Professional & scientific | 2022 |
| CAN Yigit Ltd | Transport & logistics | 2020 |
| Canaway Court (Management) Ltd | Real estate | 2023 |
| Cancer Clinic.Uk Limited | Health & social care | 2022 |
| Candall Ltd | Professional & scientific | 2011 |
| Candy Jets Aviation Limited | Transport & logistics | 2023 |
| Candy Jets Ltd | Transport & logistics | 2023 |
| Candy Yachts Limited | Arts & recreation | 2023 |
| Canfields Estates Limited | Real estate | 2018 |
| Canfields Law Services NO.2 Limited | Administrative & support | 2019 |
| Canford Builders Ltd | Construction | 2024 |
| Canford Catering Ltd | Hospitality | 2023 |
| Canford Cliffs Catering Ltd | Hospitality | 2023 |
| Canford Cliffs Country Club Ltd | Arts & recreation | 2025 |
| Canford Estates Limited | Construction | 2013 |
| Canford Financial Services Limited | Financial services | 2015 |
| Canford Hill Engineering Limited | Manufacturing | 1985 |
| Canford House Management Limited | Households | 1970 |
| Canford Motor Company Ltd | Extraterritorial | 2018 |
| Canford NOX Limited | Professional & scientific | 2025 |
| Canford Partners Limited | Professional & scientific | 2023 |
| Canford Plumbing and Heating Ltd | Construction | 2021 |
| Canford Properties Ltd | Households | 2018 |
| Canford Residential Limited | Real estate | 2025 |
| Canford Retreat Limited | Hospitality | 2023 |
| Canford System Dynamics Ltd | Wholesale & retail | 2010 |
| Canford Trading South Limited | Extraterritorial | 2024 |
| Cannon Bridge (Holdings) Limited | Professional & scientific | 2000 |
| Cannon Fitness Ltd | Other services | 2020 |
| Canonbury Road Ltd | Wholesale & retail | 2024 |
| Canopy Accounting Limited | Professional & scientific | 2022 |
| Cansea Properties Limited | Construction | 2023 |
| Canterbury Tasteful Ltd | Hospitality | 2021 |
| Cantronik Ltd | Manufacturing | 2007 |
| Canvasprintingco Ltd | Manufacturing | 2024 |
| CAP DE Nice Press Ltd | Information & communication | 2024 |
| CAP Ferrat Limited | Professional & scientific | 2010 |
| Capable Works Limited | Information & communication | 2022 |
| Capason Limited | Professional & scientific | 2013 |
| Cape Gang Ltd | Professional & scientific | 2014 |
| Capel Brown Associates Ltd | Information & communication | 2005 |
| Caper Catering Limited | Hospitality | 2025 |
| Capifo Digital Hedge Ltd | Financial services | 2026 |
| Capital Services of London Limited | Construction | 2011 |
| Capital Star Cleaning Limited | Administrative & support | 2013 |
| Capon Construction Services Limited | Construction | 2019 |
| Capp Plumbing & Renewables Limited | Construction | 2024 |
| Cappuccino Rose Weddings Ltd | Extraterritorial | 2022 |
| Captain TOM Management Limited | Households | 1994 |
| Capture This Content Ltd | Information & communication | 2026 |
| Car - Go Automotive Limited | Transport & logistics | 2013 |
| Car Assist Limited | Wholesale & retail | 2016 |