| Burleigh KOI Ltd | Manufacturing | 2025 |
| Burlington a Ltd | Real estate | 2025 |
| Burlington B Limited | Professional & scientific | 2025 |
| Business Insurance Partnership Limited | Financial services | 2019 |
| Business Machines Service Ltd | Manufacturing | 2007 |
| Busy Brain Breaks Ltd | Education | 2024 |
| Bytecrew Limited | Information & communication | 2004 |
| C & G Services (Property) Limited | Real estate | 2013 |
| C R Claridge Consulting Ltd | Professional & scientific | 2023 |
| C Rimmer Pubs Limited | Hospitality | 2026 |
| C.B. 1ST Management Limited | Health & social care | 2022 |
| Cable Termination Components Limited | Wholesale & retail | 2009 |
| Cain and Fuller Limited | Real estate | 2013 |
| Cain and Fuller Sales Limited | Extraterritorial | 2020 |
| Cain River Retreats Ltd | Hospitality | 2025 |
| Cainscross Properties, | Real estate | 1970 |
| Caketu Ltd | Information & communication | 2021 |
| Calfshire Publishing Ltd | Information & communication | 2022 |
| Calvertkralik Consulting Limited | Information & communication | 2022 |
| CAM Tyre and Autos Limited | Wholesale & retail | 2008 |
| Cambridge House Flat Management Company Limited | Households | 2019 |
| Campered UP Limited | Wholesale & retail | 2021 |
| Camworth Holdings Limited | Financial services | 2023 |
| Camworth Limited | Information & communication | 2015 |
| Cannon Estates Lettings Limited | Extraterritorial | 2020 |
| Cannon Estates Sales and Lettings Limited | Extraterritorial | 2020 |
| Cannon Estates Sales Limited | Extraterritorial | 2020 |
| Cantilever Bar Systems (EOT) Limited | Professional & scientific | 2024 |
| Cantilever Bar Systems Holdings Limited | Financial services | 2024 |
| Cantilever Bar Systems Limited | Administrative & support | 1991 |
| Capella Software Solutions Ltd | Information & communication | 2022 |
| Carers Awareness Development Ltd | Health & social care | 2024 |
| Cargo Battery Storage Limited | Energy | 2022 |
| Carich Care Limited | Health & social care | 2018 |
| Castell Coch Investments Limited | Financial services | 2015 |
| Castellum Consortium Ltd | Construction | 2013 |
| Castellum Private Clients Limited | Construction | 2013 |
| Castellum Residential Limited | Construction | 2013 |
| Castellum Trustee Limited | Financial services | 2026 |
| Cblsb Consulting Ltd | Professional & scientific | 2024 |
| CC Stonehouse Limited | Hospitality | 2022 |
| CCA Fabrication Limited | Manufacturing | 2002 |
| Ceers 2112 Ltd | Information & communication | 2025 |
| CF Stonehouse Ltd | Other services | 2022 |
| Chaceley Developments Limited | Construction | 2012 |
| Chadwick Electrical Contractors Limited | Administrative & support | 2003 |
| Changes Welcome Ltd | Health & social care | 2015 |
| Chappell Engineering Limited | Manufacturing | 1999 |
| Charlie & Ruby Rentals Ltd | Real estate | 2023 |
| Chcl Property Limited | Real estate | 2025 |
| Cheh Retail Limited | Wholesale & retail | 2019 |
| Cheltenham MOT Centre Limited | Wholesale & retail | 2016 |
| Cheltenham Mots Limited | Wholesale & retail | 2010 |
| Cheshire Farm Battery Storage Limited | Energy | 2022 |
| Chestnut Cleaning Services Ltd | Administrative & support | 2010 |
| Chlobex Limited | Real estate | 2018 |
| Chloe Applegate Beauty Ltd | Other services | 2022 |
| Chris Tilling Forestry Ltd | Agriculture & fishing | 2021 |
| Chrysarch Capital Limited | Financial services | 2025 |
| CIO Consultancy Limited | Administrative & support | 2007 |
| Cirque DU Dance Limited | Arts & recreation | 2024 |
| Cirrus Electrical Limited | Construction | 2019 |
| CJ Stove Installations Ltd | Construction | 2018 |
| CJL Motor Services Limited | Wholesale & retail | 2003 |
| CJS Engineering & Finance Ltd | Professional & scientific | 2024 |
| Clifton Solar Ltd. | Energy | 2018 |
| Clipgen Ltd | Information & communication | 2023 |
| Closeburn Limited | Financial services | 1964 |
| Club Communications Ltd. | Information & communication | 1997 |
| Cnr-Sagarmatha Limited | Transport & logistics | 2017 |
| Coach Development Academy Limited | Education | 2025 |
| Coaley Construction Limited | Real estate | 2024 |
| Coaley Junction Business Park Limited | Real estate | 1997 |
| Coburn Fasteners Limited | Wholesale & retail | 2004 |
| Coles Electrical Co Ltd | Construction | 2024 |
| Commercial Vehicle Plylining Services Ltd | Manufacturing | 2013 |
| Common Light Ltd | Health & social care | 2026 |
| Compete Career Coaching Ltd | Professional & scientific | 2024 |
| Compliant Futures Limited | Professional & scientific | 2023 |
| Conifer Close Limited | Professional & scientific | 2022 |
| Connected Quarry Limited | Professional & scientific | 2022 |
| Connectiq Ltd | Manufacturing | 2003 |
| Connings Limited | Wholesale & retail | 1975 |
| Coralbay Solutions Limited | Administrative & support | 2007 |
| Core Cleaning Services Limited | Administrative & support | 2015 |
| Coreley Limited | Administrative & support | 2011 |
| Corinium Partnership Ltd | Construction | 2012 |
| Corinium Property Developments Ltd | Construction | 2020 |
| Corinium Property Services Limited | Real estate | 2005 |
| Corinium Trading Ltd | Professional & scientific | 2023 |
| Cosstick Freeholdings Ltd | Households | 2026 |
| Cosstick Property Holdings Ltd | Real estate | 2025 |
| Cotswold Aesthetics by Jenna Limited | Health & social care | 2025 |
| Cotswold Alloys Limited | Wholesale & retail | 2020 |
| Cotswold Builder Limited | Construction | 2014 |
| Cotswold Caterham Limited | Extraterritorial | 2015 |
| Cotswold Connections (Stroud) Ltd | Construction | 2018 |
| Cotswold Electrical Installations Ltd | Construction | 2015 |
| Cotswold Enterprises Ltd | Other services | 2016 |
| Cotswold Fluidpower Limited | Manufacturing | 2007 |