| C K Miami Ltd | Hospitality | 2025 |
| C Kava Limited | Professional & scientific | 2015 |
| C L B Landscapes Limited | Construction | 2025 |
| C L D Design Limited | Construction | 2016 |
| C L J Construction Ltd | Construction | 2015 |
| C L Management Services Limited | Professional & scientific | 1992 |
| C Lartey Commercial Limited | Financial services | 2020 |
| C P Auto (South London) Limited | Wholesale & retail | 2023 |
| C R L Dwell Ltd | Real estate | 2025 |
| C S Cabling Limited | Construction | 2008 |
| C S Craik Ltd | Information & communication | 2016 |
| C S Engineering (London) Limited | Construction | 2009 |
| C S Sales Agencies Ltd | Wholesale & retail | 2018 |
| C Way Properties Limited | Real estate | 2024 |
| C&B Property Development Ltd | Real estate | 2017 |
| C&C Regan Properties LLP | | 2025 |
| C&R Catering (London) Ltd | Hospitality | 2020 |
| C&V Cars and Vans Ltd | Administrative & support | 2025 |
| C-Box Container Lines Ltd | Transport & logistics | 2021 |
| C-Squared Cleaning Limited | Administrative & support | 2025 |
| C. and a. Properties Limited | Real estate | 1979 |
| C. K. Transport Limited | Transport & logistics | 1998 |
| C. Mills Construction Ltd | Construction | 2011 |
| C.A. Samuel Dental Prosthetics Ltd | Health & social care | 2014 |
| C.B.Jackson & Company Limited | | 1926 |
| C.F.Nm Limited | Administrative & support | 2012 |
| C.Hewitt & SON Limited | Wholesale & retail | 1953 |
| C.I.B. Limited | Professional & scientific | 1984 |
| C.R. Vending & Electronics Limited | Wholesale & retail | 1967 |
| C.R.K. Leisure Limited | Hospitality | 2006 |
| C2P Investments Limited | Professional & scientific | 2024 |
| C3 Ventures Limited | Health & social care | 2016 |
| C8TM Limited | Construction | 2022 |
| CA Case Management Ltd | Health & social care | 2009 |
| Cable and Wireless Pension Trustee Limited | Financial services | 1986 |
| Cable House Court Management Company Limited | Households | 2005 |
| Caburn Fields (Ringmer) Flats Management Company Limited | Households | 2021 |
| Cacilda Events Shalome Limited | Wholesale & retail | 2017 |
| Cactus Laser Clinic and Wellness Limited | Other services | 2023 |
| Cado Horizons Ltd | Health & social care | 2023 |
| Cadogan (Bromley Road) Residents Company Limited | Households | 1974 |
| Cadogan Gardens Lessees Management Company Limited | Households | 1958 |
| Cadogan Place Residents Company Limited | Households | 1999 |
| Caduro Ltd | Wholesale & retail | 2025 |
| CAE Gwyllt Management Company Limited | Households | 2006 |
| Caesar Projects London Ltd | Construction | 2026 |
| Cafe Dino ADO Ltd | Hospitality | 2026 |
| Cafe F&D Ltd | Hospitality | 2024 |
| Cafe Madri Ltd | Hospitality | 2025 |
| Cafe Olive Ltd | Hospitality | 2023 |
| Caffe Milano DD Limited | Wholesale & retail | 2015 |
| Cahill Prime Construction Limited | Construction | 2019 |
| CAI & H Construction Limited | Administrative & support | 2023 |
| Caires Ltd | Construction | 2007 |
| Cairns Installation Services Limited | Construction | 2013 |
| CAJ Mercian Holdings Limited | Transport & logistics | 2016 |
| Cake Forest Ltd | Wholesale & retail | 2020 |
| Cakebox Ealing Limited | Wholesale & retail | 2026 |
| Cakebox Greenford Limited | Wholesale & retail | 2026 |
| Cakebox Kingstreet Limited | Wholesale & retail | 2026 |
| Cakebox Pinner Limited | Wholesale & retail | 2026 |
| Cakebox South Road Limited | Wholesale & retail | 2026 |
| Cakebox Watford Limited | Wholesale & retail | 2026 |
| Cakebox Wembley Central Limited | Wholesale & retail | 2026 |
| Cakenation Holdings Limited | Financial services | 2026 |
| Cakenation Ltd | Wholesale & retail | 2013 |
| Cakes by Chichi Ltd | Hospitality | 2015 |
| Cakes on the Corner Croydon Ltd | Wholesale & retail | 2025 |
| Cakes Town Limited | Wholesale & retail | 2025 |
| Calabash Films Limited | Information & communication | 2013 |
| Calabria MIA Beckenham Ltd | Hospitality | 2023 |
| Calametis Ltd | Professional & scientific | 2020 |
| Calculated Care Ltd | Health & social care | 2020 |
| Calculated Enterprises Ltd | Financial services | 2026 |
| Calculated Logistics Ltd | Transport & logistics | 2026 |
| Caldecote Management Company Limited | Households | 2024 |
| Calder Rise Residents Management Company Limited | Households | 2023 |
| Caldew Place Freehold Limited | Households | 2019 |
| Calitek UK Limited | Professional & scientific | 2018 |
| Callencroft Court Management Limited | Households | 1972 |
| Callender Realty Limited | Construction | 2020 |
| Callenders Green Management Company Limited | Real estate | 2018 |
| Calliope Solutions Ltd | Professional & scientific | 2025 |
| Callum Limited | Households | 1995 |
| Calluna Trading Company Limited | Professional & scientific | 2012 |
| Calm Commute Limited | Transport & logistics | 2025 |
| Calmdays Investments Ltd | Real estate | 2017 |
| Calrington Property Limited | Real estate | 2005 |
| Caltil Limited | Households | 2025 |
| Camberley Healthcare LLP | | 2012 |
| Camberley T-Shirts Limited | Wholesale & retail | 2013 |
| Camberley Towers(Management)Limited | Households | 1966 |
| Cambition IT Services Limited | Information & communication | 2012 |
| Cambodian Cuisine Limited | Hospitality | 2019 |
| Cambridge Autos Ltd | Wholesale & retail | 2012 |
| Cambridge Drinks Collective Ltd | Manufacturing | 2024 |
| Cambridge Gate Management Limited | Households | 1997 |
| Cambridge House and Roseland House Limited | Households | 2006 |
| Cambridge Mews (Hove) Management Company Limited | Households | 2001 |
| Camcool Limited | Manufacturing | 2012 |