| Crystal Clear Bristol Limited | Wholesale & retail | 1999 |
| Crystal Clear Propertys Ltd | Construction | 2020 |
| Crystal Clear Windows and Conservatories Limited | Extraterritorial | 2010 |
| Crystal Key Solutions Limited | Real estate | 2020 |
| Crystal Market Research Ltd | Professional & scientific | 2001 |
| Crystal Minds Consultancy Limited | Professional & scientific | 2013 |
| Crystal Orange Ltd | Information & communication | 2018 |
| Crystal Port Cleaning Ltd | Administrative & support | 2016 |
| Crystal Sky Consulting Ltd | Administrative & support | 2014 |
| Crystal Technologies Incorporated Ltd | Professional & scientific | 2007 |
| Crystal Wealth Limited | Financial services | 2016 |
| Crystal Wealth Management Limited | Financial services | 2003 |
| Crystal Wealth Management LLP | | 2006 |
| Crystal Will Writing Ltd | Professional & scientific | 2020 |
| Crystal WON Property Limited | Real estate | 2025 |
| Crystalhr Limited | Professional & scientific | 2016 |
| Crystalwink Limited | Information & communication | 2008 |
| Crzy Ltd | Wholesale & retail | 2019 |
| CS & JB Investments Limited | Real estate | 2001 |
| CS and LW Ltd | Extraterritorial | 2017 |
| CS Boxing Limited | Arts & recreation | 2014 |
| CS Cleaning Services Limited | Administrative & support | 2005 |
| CS Crown Care Ltd | Education | 2026 |
| CS Engineering & Pipework Services Ltd | Energy | 2009 |
| CS Fruiterers Limited | Wholesale & retail | 2024 |
| CS Groundworks (Bristol) Limited | Construction | 2017 |
| CS Home Heat Ltd | Construction | 2019 |
| CS Innovative Solutions Ltd | Information & communication | 2022 |
| CS Inns Ltd | Hospitality | 2022 |
| CS IT Consulting Ltd | Information & communication | 2023 |
| CS Operating Company Limited | Real estate | 2017 |
| CS Portland Limited | Real estate | 2020 |
| CS Systems Engineering Limited | Information & communication | 2018 |
| CS Talent Solutions Ltd | Administrative & support | 2013 |
| Csaa Ventures Ltd | Real estate | 2025 |
| Csaba Ledeczi Limited | Hospitality | 2017 |
| CSD Friction Limited | Wholesale & retail | 1983 |
| CSD Support Services Ltd | Professional & scientific | 2023 |
| CSG Systems UK Limited | Administrative & support | 2010 |
| Cshb Property Ltd | Real estate | 2026 |
| CSI Ecosystem Ltd | Information & communication | 2024 |
| CSJ Commodities Limited | Wholesale & retail | 2006 |
| CSJ Legal Ltd | Professional & scientific | 2023 |
| Cslap Ltd | Construction | 2014 |
| CSM (Bristol) Ltd | Professional & scientific | 2007 |
| CSO Flooring Ltd | Construction | 2011 |
| CSP Accountancy Ltd | Professional & scientific | 2025 |
| Csrb Ltd | Administrative & support | 2017 |
| CSW Bloodstock Ltd | Agriculture & fishing | 2025 |
| CSW Extensions Limited | Construction | 2016 |
| CSW Loft Conversions Limited | Construction | 2008 |
| CSW Properties Bristol Limited | Real estate | 2018 |
| CSW Sales Livery Ltd | Agriculture & fishing | 2025 |
| Cswc Ltd | Professional & scientific | 2024 |
| CT Bristol Limited | Hospitality | 2023 |
| CT Electrical & Developments Limited | Construction | 2023 |
| CT Engineering Group UK Ltd | Professional & scientific | 2013 |
| CT Event Catering Ltd | Hospitality | 2023 |
| CT Garages Limited | Wholesale & retail | 2006 |
| CT Hospitality Ltd | Hospitality | 2020 |
| CT Production Services Limited | Arts & recreation | 2018 |
| CT Scenic Limited | Information & communication | 2016 |
| CT Transport Logistics Ltd | Transport & logistics | 2021 |
| CTB Shutters Ltd | Wholesale & retail | 2026 |
| CTB Workshop Limited | Real estate | 2020 |
| Ctcds Ltd | Information & communication | 2019 |
| Ctech Air Conditioning Ltd | Energy | 2022 |
| Ctech Business Consultant Ltd | Professional & scientific | 2019 |
| Ctrg Limited | Administrative & support | 2022 |
| Ctrl Change Limited | Professional & scientific | 2022 |
| Ctrl+B Ltd | Information & communication | 2015 |
| CTU General Partner Limited | Administrative & support | 2009 |
| CTZ Ventures Ltd | Health & social care | 2025 |
| Cuatro Caminos Ltd | Real estate | 2025 |
| CUB Care Nursery Ltd | Extraterritorial | 2019 |
| Cubas Limited | Hospitality | 2016 |
| Cubatone Ltd | Wholesale & retail | 2017 |
| Cubbies Language Learning Limited | Education | 2023 |
| Cube 46 Ltd | Professional & scientific | 2018 |
| Cube Brick Ltd | Professional & scientific | 2014 |
| Cube Concept Stores Ltd | Wholesale & retail | 2022 |
| Cube Construction (Southern) Limited | Construction | 2010 |
| Cube Fire Ltd | Administrative & support | 2010 |
| Cube Inc Limited | Wholesale & retail | 2011 |
| Cube Masonry Limited | Construction | 2024 |
| Cubean UK Ltd | Professional & scientific | 2018 |
| Cubecoders Limited | Information & communication | 2013 |
| Cubex Property Ltd | Administrative & support | 2020 |
| Cubicgarden Ltd | Information & communication | 2025 |
| Cubics Limited | Real estate | 2021 |
| CUBICWORKS0 Ltd | Construction | 2026 |
| Cubik Electronic Product Support Ltd | Professional & scientific | 2025 |
| Cubik Innovation Ltd | Professional & scientific | 2012 |
| Cubit SES Limited | Professional & scientific | 2013 |
| Cubix Construction Consultants Ltd | Professional & scientific | 2011 |
| Cuckfield Real Estate Limited | Real estate | 2024 |
| Cucumber Street Limited | Information & communication | 1988 |
| Cudeks Services Limited | Health & social care | 2018 |
| CUE the Creative Digital Limited | Information & communication | 2016 |
| Cuff Services Limited | Construction | 2016 |