| C Wright Management Limited | Administrative & support | 2010 |
| C Y Associates Ltd | Professional & scientific | 2013 |
| C&A Channa Investments Ltd | Real estate | 2024 |
| C&B Electrical Services Ltd | Construction | 2017 |
| C&C Fire Protection Ltd | Construction | 2021 |
| C&C Solicitors Ltd | Professional & scientific | 2020 |
| C&D Dynamic Motors Ltd | Wholesale & retail | 2025 |
| C&G Builders (London) Limited | Construction | 2017 |
| C&G Group Holdings Ltd | Professional & scientific | 2025 |
| C&G Location Specialists Limited | Transport & logistics | 2024 |
| C&J Care Services Ltd | Health & social care | 2011 |
| C&K Investments (London) Ltd | Real estate | 2017 |
| C&K Investments Holdings Limited | Financial services | 2020 |
| C&K Investments Radnor Limited | Real estate | 2020 |
| C&K Ventures Ltd | Wholesale & retail | 2026 |
| C&M1 Construction Limited | Construction | 2020 |
| C&R Healthcare Limited | Wholesale & retail | 2025 |
| C&R Rail Limited | Professional & scientific | 2025 |
| C&R Tiller Residential Ltd | Real estate | 2023 |
| C&S Autos Limited | Wholesale & retail | 2026 |
| C&V Building Maintenance Limited | Manufacturing | 2019 |
| C-Lettings-Agent Ltd | Real estate | 2025 |
| C.Panchici Ltd | Construction | 2020 |
| C.R.Kudhail & Company Limited | Real estate | 1964 |
| C2R Investments Ltd | Construction | 2025 |
| C4CHATGA Ltd | Information & communication | 2023 |
| CA Homes Limited | Real estate | 2018 |
| CA Lettings and Management Limited | Real estate | 2026 |
| Ca.Fire Ltd | Construction | 2020 |
| CA64 Limited | Professional & scientific | 2026 |
| Caapi Health Ltd | Wholesale & retail | 2023 |
| CAB 8 Limited | Transport & logistics | 2025 |
| CAB Ride Limited | Other services | 2015 |
| Cabot Enterprise Ltd | Administrative & support | 2013 |
| Cabot Services Ltd | Construction | 2009 |
| Cabwall Limited | Hospitality | 2025 |
| Caccavale & SON Ltd | Construction | 2012 |
| Cadamban Limited | Health & social care | 2022 |
| Cadiz Enterprise UK Limited | Wholesale & retail | 2024 |
| Caelum Property Solutions Limited | Real estate | 2014 |
| Caetop College London Ltd | Administrative & support | 2011 |
| Cafacci Ltd | Wholesale & retail | 2021 |
| Cafe 104 Ltd | Hospitality | 2016 |
| Cafe 6 Limited | Wholesale & retail | 2020 |
| Cafe Alto Limited | Hospitality | 2016 |
| Cafe at George Lane Limited | Hospitality | 2022 |
| Cafe Boho Limited | Manufacturing | 2024 |
| Cafe Chaiiwala Ltd | Hospitality | 2021 |
| Cafe Kream Ltd | Hospitality | 2019 |
| Cafe Lavista London Ltd | Hospitality | 2023 |
| Cafe LEA Ltd | Hospitality | 2018 |
| Cafe Ring Ltd | Real estate | 2012 |
| CAFE334 Ltd | Hospitality | 2025 |
| Cafee Italia 1 Ltd | Hospitality | 2017 |
| Caffe Della Limited | Hospitality | 2015 |
| Caffe Royale London Ltd | Manufacturing | 2020 |
| CAFFE88 Limited | Manufacturing | 2023 |
| Caffeinated Dreams Ltd | Professional & scientific | 2019 |
| Café-Couture Studios Ltd | Manufacturing | 2026 |
| Cagechastity Ltd | Wholesale & retail | 2024 |
| Caister Property Limited | Real estate | 2025 |
| Cake Bake Station Ltd | Manufacturing | 2026 |
| Cake Blossom Ltd | Manufacturing | 2020 |
| Cake Box (Barkingside) Limited | Hospitality | 2013 |
| Cake Box (Goodmayes) Limited | Wholesale & retail | 2012 |
| Cake Search Ltd | Information & communication | 2015 |
| Cakebox Pplr Ltd | Hospitality | 2022 |
| Cakebox Southend Ltd | Wholesale & retail | 2016 |
| Cakes & Bakes Goodmayes Ltd | Wholesale & retail | 2019 |
| Cakes & Bakes Ilford Ltd | Wholesale & retail | 2021 |
| Cakes Art Ltd | Wholesale & retail | 2013 |
| Cakesetc Ltd | Arts & recreation | 2018 |
| Calachat Ltd | Information & communication | 2025 |
| Calco Athletics Limited | Arts & recreation | 2017 |
| Calculaz Automotive Solutions UK Ltd | Manufacturing | 2023 |
| Caldera London Ltd | Hospitality | 2023 |
| Calgees Limited | Information & communication | 2013 |
| Cali Collectives Ltd | Wholesale & retail | 2019 |
| Cali OUD Ltd | Wholesale & retail | 2026 |
| Cali PO Arcfarms Ltd | Wholesale & retail | 2021 |
| Calibre Global Limited | Information & communication | 2016 |
| Call in First UK Limited | Wholesale & retail | 2011 |
| Calliope UK Interior Architecture Limited | Professional & scientific | 2015 |
| Callisto Capital Ltd | Financial services | 2024 |
| Calyx Holdings Ltd | Real estate | 2020 |
| Camarketplace Ltd | Wholesale & retail | 2025 |
| Camber Security Limited | Administrative & support | 2008 |
| Camberwell Glebe Ltd | Other services | 2023 |
| Cambo Properties Limited | Real estate | 2017 |
| Cambridge City Souvenir Ltd | Wholesale & retail | 2024 |
| Cambridge Day Nursery Limited | Education | 2006 |
| Cambridge Flame Education Global Limited | Professional & scientific | 2014 |
| Cambridge Language UK Limited | Administrative & support | 2025 |
| Cambridge Nation College Ltd | Education | 2024 |
| Camden Agar Ltd | Real estate | 2015 |
| Camden Devis Limited | Other services | 2023 |
| Cameron Invest Limited | Real estate | 2019 |
| Cameron Loft & Construction Limited | Construction | 2000 |
| Cameron Properties Limited | Households | 1984 |
| Camford Tutors Limited | Education | 2025 |