| C3 Property Consultancy Limited | Professional & scientific | 2026 |
| C4 Heating Ltd | Construction | 2022 |
| C4 Industries Limited | Extraterritorial | 2002 |
| C5 Estates Ltd | Real estate | 2024 |
| C5 Properties Limited | Real estate | 2022 |
| C7 Holdings Limited | Financial services | 2020 |
| C7 Property Limited | Real estate | 2020 |
| C9 Payroll Ltd | Professional & scientific | 2022 |
| CA Accountants Ltd | Professional & scientific | 2025 |
| CA Estates Ltd | Real estate | 2021 |
| CA Management Ltd | Administrative & support | 2023 |
| Caarrs Limited | Information & communication | 2020 |
| Caasi Home Inspections Limited | Real estate | 2023 |
| Caasih Limited | Information & communication | 2022 |
| CAB Hire Limited | Administrative & support | 2014 |
| CAB NW Limited | Construction | 2024 |
| Caballo Grande Ltd | Administrative & support | 2017 |
| Cabanon Bespoke Furniture Limited | Manufacturing | 2026 |
| Cabij&Co Limited | Hospitality | 2024 |
| Cable Jointing Solutions (NW) Limited | Administrative & support | 2022 |
| Cable Street Lancaster Development Limited | Real estate | 2020 |
| Cable Swan Limited | Real estate | 2016 |
| Cable Systems Management (CSM) Limited | Professional & scientific | 2019 |
| Cable Tapes (UK) Ltd | Manufacturing | 2008 |
| Cable Tapes Employee Ownership Trustees Limited | Professional & scientific | 2023 |
| Cableco (NW) Limited | Wholesale & retail | 2022 |
| Cablesmith Electrical Services Ltd | Construction | 2019 |
| Cabmora Media Ltd | Professional & scientific | 2026 |
| Cabochon Insight Services Limited | Health & social care | 2022 |
| Cabpass Ltd | Administrative & support | 2026 |
| Cabral's Ltd | Wholesale & retail | 2019 |
| Cabrelli Limited | Hospitality | 2020 |
| Cabzilla Transport Limited | Transport & logistics | 2022 |
| CAC the Restoration House | Public administration | 2024 |
| Cacao Heritage Limited | Hospitality | 2017 |
| Cachetalk AI Ltd | Information & communication | 2025 |
| Caco Designs Ltd | Construction | 2023 |
| Cacp Investments LLP | | 2024 |
| Cacpp Tech Ltd | Wholesale & retail | 2026 |
| Cactushawk Limited | Real estate | 2025 |
| CAD Cleaning Services Limited | Administrative & support | 2024 |
| CAD Drawings & 3D Visuals Ltd | Professional & scientific | 2018 |
| Cad&Co Ltd | Construction | 2020 |
| Caddie Golf Ltd | Information & communication | 2026 |
| Cade Shoes Limited | Administrative & support | 2023 |
| Cadela Properties Ltd | Real estate | 2021 |
| Caden Radio Limited | Administrative & support | 2010 |
| Cadence Leadership Ltd | Professional & scientific | 2021 |
| Cadence Performance UK, Limited | Manufacturing | 2024 |
| Cadgm Limited | Health & social care | 2022 |
| Cadishead Accountancy Services Limited | Professional & scientific | 2001 |
| Cadishead Autos Limited | Wholesale & retail | 2014 |
| Cadulac Chemicals Limited | Manufacturing | 2016 |
| Caelus Partners Limited | Professional & scientific | 2025 |
| Caer Cosmetic, Aesthetic and Reconstructive Plastic Surgery Ltd | Health & social care | 2008 |
| Caer Rhun Hall Hotel Limited | Real estate | 2015 |
| Caer Rhun Hotel Management Limited | Hospitality | 2015 |
| Caerddaniel Limited | Real estate | 2018 |
| Caernarfon Properties Limited | Real estate | 2020 |
| Caerus Holdco Limited | Financial services | 2026 |
| Caerus Technologies Limited | Financial services | 2020 |
| Caesar & Co UK Limited | Wholesale & retail | 2023 |
| Caesar Investments Ltd | Real estate | 2007 |
| Caesarland Limited | Transport & logistics | 2021 |
| CAF Business Solutions Limited | Information & communication | 2011 |
| Cafe 10 Ltd | Hospitality | 2024 |
| Cafe 200 Company Limited | Hospitality | 2025 |
| Cafe Baba Limited | Hospitality | 2014 |
| Cafe Bar EIGHT46 Limited | Hospitality | 2022 |
| Cafe BEE Earth Angel CIC | Hospitality | 2025 |
| Cafe Blah Ltd | Hospitality | 2025 |
| Cafe CHI Ltd | Health & social care | 2022 |
| Cafe Fresco Ltd | Hospitality | 2026 |
| Cafe Karachi Ltd | Hospitality | 2025 |
| Cafe MEF Limited | Hospitality | 2008 |
| Cafe North Ltd | Hospitality | 2012 |
| Cafe Pankakes Ltd | Hospitality | 2025 |
| Cafe Plus 1 Ltd | Hospitality | 2023 |
| Cafe Renovate Ltd | Hospitality | 2018 |
| Cafe Retro & Catering Limited | Hospitality | 2025 |
| Cafe SE7EN Ltd | Hospitality | 2018 |
| Cafe Soomaal Ltd | Hospitality | 2022 |
| Cafe Turka Ltd | Hospitality | 2011 |
| Cafezinho (Middleton) Limited | Hospitality | 2014 |
| Caff MCR Ltd | Hospitality | 2023 |
| Caffe Bar Gemini Limited | Hospitality | 2024 |
| Cafè Bottega Ltd | Manufacturing | 2026 |
| Café Zayn Ltd | Hospitality | 2025 |
| Cage Beauty Hub Limited | Other services | 2026 |
| Cage Engineering Limited | Professional & scientific | 2024 |
| Cages Online Ltd | Wholesale & retail | 2025 |
| Cagray Ltd | Information & communication | 2026 |
| Cahill Manchester Limited | Construction | 2007 |
| Cahill's Properties Limited | Real estate | 2017 |
| CAI Ying Ltd | Wholesale & retail | 2025 |
| CAI Zhentao Limited | Wholesale & retail | 2025 |
| Caigo Ltd | Hospitality | 2026 |
| Cailex Logistics Limited | Transport & logistics | 2018 |
| Cailin Trading UK Ltd | Wholesale & retail | 2023 |
| Caim Design Limited | Manufacturing | 2026 |