| CR2 Security Group Limited | Administrative & support | 2022 |
| CR2 Security Training Limited | Education | 2024 |
| Cra-Z Limited | Manufacturing | 2015 |
| Crab Farms Limited | Agriculture & fishing | 2011 |
| Crabtree PM Limited | Households | 1983 |
| Cracking Education Ltd | Education | 2025 |
| Cradl Eco Homes Ltd | Construction | 2018 |
| Cradl Holdings Ltd | Real estate | 2018 |
| Craft Build Ltd | Construction | 2021 |
| Craft Carpentry & Joinery Limited | Construction | 2024 |
| Craft Conservation & Management Limited | Construction | 2026 |
| Craft Limework Limited | Construction | 2012 |
| Craftmore Ltd | Construction | 2010 |
| Craig Lawrence Consulting Limited | Professional & scientific | 2022 |
| Cranborne Capital Limited | Financial services | 2005 |
| Cranborne Communications Ltd | Professional & scientific | 2016 |
| Cranborne Estates Limited | Professional & scientific | 2011 |
| Cranborne Heights Management Company Limited | Households | 2013 |
| Cranbourne Homes and Apartments Limited | Construction | 2001 |
| Crane Valley Construction Ltd | Construction | 2026 |
| Cranks and Planks Limited | Administrative & support | 2021 |
| Craster Properties Ltd | Construction | 2021 |
| Crawford Avenue Residents (Wembley) Limited | Households | 1970 |
| Craze Brothers Limited | Real estate | 1955 |
| Crazy Pave Ltd | Administrative & support | 2026 |
| CRE8 Homes Limited | Construction | 2010 |
| Creative Contracts Limited | Construction | 2007 |
| Creative Curtains (Salisbury) Limited | Wholesale & retail | 2001 |
| Creative Impact Ltd. | Information & communication | 1998 |
| Creative Kitchens Salisbury Limited | Construction | 2008 |
| Creative Wisdom Ltd | Professional & scientific | 2011 |
| Crescent Trustees Limited | Financial services | 2000 |
| Cresswell Park (Angmering) Management Company Limited | Households | 2016 |
| Cretian Limited | Real estate | 1997 |
| Crew Barber Shops Ltd | Other services | 2000 |
| Crew Hythe Limited | Other services | 2013 |
| Crewe & Ashley Contractors Limited | Administrative & support | 2008 |
| Crewkerne Storage Ltd | Transport & logistics | 2022 |
| CRG Enterprises Ltd | Information & communication | 2019 |
| Cricktree Ltd | Information & communication | 2024 |
| Critical Power Solutions UK Ltd | Construction | 2016 |
| Crmarketing & Events Ltd | Professional & scientific | 2025 |
| Crockers Gillingham Limited | Wholesale & retail | 2002 |
| Crockhurst Farm LLP | | 2019 |
| Croft Gardens (Knebworth) Management Company Limited | Households | 2022 |
| Croft Life Limited | Professional & scientific | 2011 |
| Cromwell Court Management Company (Basingstoke) Limited | Real estate | 2022 |
| Cronus Cards Limited | Wholesale & retail | 2024 |
| Cross & Cross Limited | Wholesale & retail | 2004 |
| Cross Lane Management Company Ltd | Real estate | 2017 |
| Crosspoint Limited | Professional & scientific | 1983 |
| Crosthwaite Limited | Administrative & support | 2012 |
| Crownshade Limited | Construction | 2007 |
| Crusader Carpets Limited | Wholesale & retail | 2010 |
| Cryptocraft Limited | Information & communication | 2012 |
| Cryptofusion Ltd | Information & communication | 2022 |
| Crystal 3D Images Limited | Wholesale & retail | 2008 |
| Crystalnet Limited | Information & communication | 2011 |
| CU Connected Ltd | Extraterritorial | 2010 |
| CU Protected Ltd | Extraterritorial | 2010 |
| Cuba Property Limited | Extraterritorial | 2007 |
| Cube Design Ltd | Professional & scientific | 2002 |
| Cubed Group Ltd | Financial services | 2017 |
| Cubitt Apartments Management Company Limited | Households | 2014 |
| Cuckoowood Farm Limited | Construction | 2002 |
| Cuesta Ltd. | Professional & scientific | 2014 |
| Cuffs Lane Management Company Limited | Households | 1997 |
| Cullen Property Solutions Limited | Construction | 2020 |
| Culm Valley Park (Cullompton) Management Company Limited | Households | 2022 |
| Cultivating Wonder Limited | Education | 2021 |
| Culture Dividend Ltd | Professional & scientific | 2010 |
| Culverhill Retail Limited | Wholesale & retail | 2007 |
| Cumulus Software Ltd | Information & communication | 2017 |
| Cunning Running Software Trustee Limited | Professional & scientific | 2022 |
| Curation Music Limited | Professional & scientific | 2020 |
| Curford Ltd | Information & communication | 2020 |
| Curling Contractors Limited | Construction | 2019 |
| Curry Emperor Limited | Hospitality | 2013 |
| Curtis Banks Group Limited | Financial services | 2012 |
| Curtis Banks Limited | Financial services | 2008 |
| Curtrini Group Limited | Real estate | 2024 |
| Curventa Designworks Limited | Professional & scientific | 2001 |
| Curwen Homes Limited | Real estate | 2025 |
| Curwen Property 1 Limited | Real estate | 2023 |
| Curwen Property Limited | Real estate | 2020 |
| Custodian Care Ltd | Public administration | 2020 |
| Custom Builderss Limited | Construction | 2023 |
| Custom Track & Blinds Limited | Other services | 2009 |
| CX Classics Limited | Administrative & support | 2013 |
| CX Commercial Limited | Information & communication | 1999 |
| Cybele (Holdings) Limited | Extraterritorial | 2006 |
| Cybele Properties Ltd | Real estate | 2022 |
| Cybele Training & Consultancy Ltd | Education | 1999 |
| Cylaros Limited | Professional & scientific | 2022 |
| Cypresstree Investments Limited | Construction | 1991 |
| Cypresstree Properties Limited | Real estate | 1982 |
| D & B Facades UK Limited | Construction | 2001 |
| D & G Developments (North Cheam) Ltd | Real estate | 2024 |
| D & G Developments (South East) Limited | Real estate | 2024 |
| D & N Construction (Salisbury) Limited | Construction | 2020 |