| Brand 360 Collective Limited | Professional & scientific | 2024 |
| Brand IP Limited | Information & communication | 2025 |
| Brique ET Mortier Limited | Real estate | 2013 |
| Britannia Cleaning Services (UK) Limited | Administrative & support | 2003 |
| Brittons Group Limited | Manufacturing | 2015 |
| Brocton Imaging Limited | Financial services | 2016 |
| Brooms Park Limited | Hospitality | 2003 |
| Btbcoms Limited | Information & communication | 2024 |
| Buildpower Limited | Manufacturing | 2001 |
| Bumbershoot Limited | Financial services | 2010 |
| Bumbershoot Properties Limited | Real estate | 2023 |
| Business Portal (UK) Limited | Administrative & support | 2012 |
| Butler Whimpanny Ltd | Real estate | 2025 |
| Butlers Ltd | Real estate | 2024 |
| Buytogive Group Ltd | Wholesale & retail | 2025 |
| Bytek Solutions Ltd | Professional & scientific | 2025 |
| B[ ]X Shop Limited | Wholesale & retail | 2013 |
| C & K Plant Hire Limited | Manufacturing | 2014 |
| C4C Ownership Partners Limited | Professional & scientific | 2014 |
| C4C SIP Trustee Limited | Extraterritorial | 2016 |
| Calculex Accountancy Limited | Extraterritorial | 2019 |
| Canal Cruising Company Limited | Manufacturing | 1948 |
| Canalscape Ltd | Transport & logistics | 2024 |
| Canton Chef Ltd | Hospitality | 2025 |
| Caparol (U.K.) Limited | Construction | 1994 |
| Capeman Limited | Real estate | 2020 |
| Capital for Colleagues PLC | Financial services | 2013 |
| Capula Group Limited | Information & communication | 2006 |
| Capula Limited | Information & communication | 1969 |
| Carbon Design Limited | Professional & scientific | 2008 |
| Caribou Developments Ltd | Construction | 2018 |
| Caroline Ellis Mortgages Ltd | Financial services | 2025 |
| Carpenter Oak Group (EOT) Limited | Extraterritorial | 2023 |
| Carpvin Flooring Limited | Construction | 2024 |
| CB Digital Media Ltd | Information & communication | 2022 |
| CCS Construction (2024) Ltd | Administrative & support | 2024 |
| Cebrian (U.K.) Limited | Wholesale & retail | 1982 |
| Cebrian Management Services Limited | Real estate | 2013 |
| Cedar Tree Developments Limited | Real estate | 2003 |
| Cegray Limited | Professional & scientific | 2026 |
| Central Garages (Stone) Ltd | Wholesale & retail | 2020 |
| Ceram Research Ltd | Professional & scientific | 2008 |
| Ceramic Materials and Manufacturing Consultancy Ltd | Professional & scientific | 2008 |
| CH Car & Motorcycle Ltd | Extraterritorial | 2020 |
| Chaffinch Psychology Ltd | Education | 2021 |
| Charlotte Foster Ltd | Administrative & support | 2022 |
| Chateau LA Renaudie Limited | Manufacturing | 2019 |
| Chestwood Design Limited | Manufacturing | 2010 |
| Cheswardine Estates Ltd | Construction | 2025 |
| Chikum Limited | Health & social care | 2012 |
| Chilled Kampa Company Ltd | Wholesale & retail | 2021 |
| Choice Point Consulting Ltd | Professional & scientific | 2023 |
| Chuckle Productions CIC | Arts & recreation | 2009 |
| Church Street (Stone) RTM Company Limited | Households | 2015 |
| CJB & Sons Limited | Financial services | 2025 |
| Cjld Limited | Agriculture & fishing | 2022 |
| Ckcentral Ltd | Extraterritorial | 2022 |
| Clayton Warnes Consulting Ltd | Professional & scientific | 2022 |
| Clever MX Ltd | Professional & scientific | 2025 |
| Cmwilkinson Care Consultancy Ltd | Professional & scientific | 2024 |
| CNC Machine Tool Services UK Ltd | Manufacturing | 2008 |
| CNS Autos Limited | Professional & scientific | 2023 |
| Cobane SR Limited | Professional & scientific | 2025 |
| Cobra Sports (Staffs) Ltd | Wholesale & retail | 2025 |
| Cocknage Barns Management Ltd | Households | 2019 |
| Cold Norton Developments Limited | Real estate | 2002 |
| College Gardens Management (NO.2) Limited | Households | 1990 |
| Community Complex Care Consultancy Ltd | Health & social care | 2021 |
| Complete Integrated Certification Services Ltd | Professional & scientific | 1985 |
| Concept Coaching Ltd | Professional & scientific | 2022 |
| Conlon Property Management Services Limited | Real estate | 2021 |
| Connectarc Consulting Ltd | Professional & scientific | 2025 |
| Connecting Ambition Limited | Administrative & support | 2015 |
| Construction Data Resources Limited | Real estate | 1998 |
| Construction Services Consultancy Ltd | Construction | 2021 |
| Construction Services Holdings Ltd | Extraterritorial | 2026 |
| Contelec Limited | Extraterritorial | 1994 |
| Control System Design Services Ltd | Professional & scientific | 2022 |
| Conway Associates (UK) Ltd | Real estate | 2003 |
| Cooee Marketing Ltd | Professional & scientific | 2016 |
| Cookson Conner Courier Plating Ltd | Information & communication | 2008 |
| Copeys Engineering Services Limited | Wholesale & retail | 2012 |
| Cordura Limited | Health & social care | 2007 |
| Costessy Limited | Real estate | 1999 |
| Coulthard Associates Limited | Professional & scientific | 2013 |
| Country Homes for Children Limited | Health & social care | 2022 |
| Countryside Vehicles Limited | Wholesale & retail | 2001 |
| COX Partners Limited | Financial services | 2011 |
| COX Partners Property Limited | Real estate | 2022 |
| Cranberry Hills Ltd | Real estate | 2024 |
| CRD Lean Management Ltd | Professional & scientific | 2014 |
| Creative Cosmetic Clinic Ltd | Other services | 2024 |
| Critchlow Auctions Ltd | Real estate | 2023 |
| Critchlow Estate Agents Ltd | Real estate | 2020 |
| Critchlow Holdings Ltd | Financial services | 2022 |
| Croft BTL Limited | Real estate | 2017 |
| Croft Global Limited | Financial services | 2017 |
| Croft NW Limited | Real estate | 2017 |
| Crookshank & Co Limited | Professional & scientific | 2006 |
| Crookshank Mcintosh Enterprises Limited | Professional & scientific | 2018 |