| Carrack Developments Limited | Construction | 2025 |
| Carrick Court Limited | Households | 2022 |
| Carson Contractors Limited | Construction | 2002 |
| Carter Builders Ltd | Construction | 2018 |
| Carter Children Investments Limited | Real estate | 2004 |
| Carter Construction Limited | Extraterritorial | 2004 |
| Carter Fitch Limited | Wholesale & retail | 2012 |
| Carter Holmes Limited | Information & communication | 2007 |
| Carterharcourt Medical Ltd. | Real estate | 2003 |
| Carterprop Ltd | Financial services | 2025 |
| Cartonnex Limited | Manufacturing | 2025 |
| Cartwright Inspired Ltd | Arts & recreation | 2025 |
| Carver Knowles Cheltenham Ltd | Real estate | 2011 |
| Carw Films Ltd | Information & communication | 2024 |
| CAS Care and Support Limited | Health & social care | 2008 |
| Casa Casa Group Limited | Extraterritorial | 2025 |
| Casemaker Limited | Information & communication | 1993 |
| Casepress Limited | Construction | 1995 |
| Cashability Ltd | Professional & scientific | 2009 |
| Caso Property Ltd | Real estate | 2022 |
| Caspari Interiors Ltd | Other services | 2013 |
| Cassablanca Limited | Hospitality | 2026 |
| Cassandra Ltd | Administrative & support | 2021 |
| Cassie Kane Coaching Ltd | Health & social care | 2026 |
| Cassius Ltd | Extraterritorial | 2009 |
| Castanea Services Limited | Administrative & support | 2015 |
| Castelein Construction Ltd | Construction | 2023 |
| Castle Court Residents Association (Stroud) Limited | Households | 1988 |
| Castle Electrical Ltd | Construction | 2016 |
| Castle Housing Limited | Financial services | 2002 |
| Castlegate Business Park Limited | Real estate | 2010 |
| Castleton Films Ltd | Information & communication | 2026 |
| Castleton Villas Limited | Households | 2021 |
| Casvet LLP | | 2004 |
| Catbear Ltd | Information & communication | 2024 |
| Catbrain Holdings Limited | Professional & scientific | 2014 |
| Catchpoint Systems Limited | Information & communication | 2014 |
| Caterflow AI Limited | Extraterritorial | 2025 |
| Cathedral Care (Gloucester) Limited | Health & social care | 1999 |
| Cathedral House RTM Company Limited | Households | 2025 |
| Cathedral Living Limited | Real estate | 2022 |
| Catherine Colebrook Limited | Wholesale & retail | 2010 |
| Cato Creative Limited | Professional & scientific | 2012 |
| Cattivo Pizza Ltd | Hospitality | 2024 |
| Cattlegrid Ltd | Information & communication | 2026 |
| Caudle Homes & Developments Ltd | Construction | 2017 |
| Caudle Homes Ltd | Real estate | 2019 |
| Caudle Roofing Ltd | Construction | 2011 |
| Cavalier Films Limited | Information & communication | 2019 |
| Cavalry Marketing Limited | Professional & scientific | 1997 |
| Cavendish Homes Limited | Construction | 1982 |
| Cavilock Ltd | Construction | 2003 |
| CAW Construction Services Ltd | Professional & scientific | 2022 |
| Cawthorne Training & Development Limited | Health & social care | 2007 |
| Cayenne Film Company Ltd | Information & communication | 2011 |
| Cayenne Web Development Limited | Information & communication | 2002 |
| Cayley Chemical Corporation Limited | Extraterritorial | 1987 |
| CB Dental Limited | Health & social care | 2022 |
| CBJ Homes Ltd | Real estate | 2018 |
| Cblv Community CIC | Education | 2025 |
| Cbnb Property Management Ltd | Construction | 2024 |
| CBS Ltd | Professional & scientific | 2006 |
| Cbsa Business Services Ltd | Financial services | 2021 |
| Cbsg Ltd | Financial services | 2025 |
| CC Developments Ltd | Construction | 2020 |
| CC Ground Investigations Limited | Construction | 2001 |
| CC Insight Consultancy Limited | Professional & scientific | 2016 |
| CC Site Investigations Ltd | Construction | 2026 |
| CCA Bentham Limited | Professional & scientific | 2005 |
| CCI Multimedia Limited | Professional & scientific | 2021 |
| Ccml Ltd | Professional & scientific | 2017 |
| Ccomp Ltd | Hospitality | 2023 |
| CCP Homes Ltd | Extraterritorial | 2018 |
| CD Collections Ltd | Construction | 2026 |
| CDB Cheltenham Limited | Hospitality | 2022 |
| Cdbh Limited | Financial services | 2022 |
| CDM Ductwork Limited | Construction | 2000 |
| Cdmh Electrical Ltd | Construction | 2017 |
| Cdqlocum Ltd | Wholesale & retail | 2022 |
| CDS Publications Limited | Professional & scientific | 2003 |
| CDS Support Limited | Information & communication | 2016 |
| Cdsllp Partner Limited | Professional & scientific | 2010 |
| CDW Systems Limited | Manufacturing | 2009 |
| CDW Trade Supplies Ltd | Manufacturing | 2025 |
| CE Motors (Chelt) Ltd | Information & communication | 2024 |
| Cebol Ltd | Transport & logistics | 2019 |
| Cebt Ltd | Administrative & support | 2015 |
| Cecag Limited | Wholesale & retail | 2021 |
| Cece Imports Ltd | Wholesale & retail | 2025 |
| Cedar Bay Evolve Ltd | Information & communication | 2021 |
| Cedar Court Cheltenham RTM Company Limited | Households | 2016 |
| Cedar House (Cheltenham) Management Company Limited | Households | 1986 |
| Cedar Point Lettings Ltd | Real estate | 2024 |
| Cedar Property Ventures Ltd | Real estate | 2020 |
| Cedars Larkhay Management Company Limited(The) | Households | 1982 |
| Cedartown Limited | Agriculture & fishing | 1975 |
| CEE Experiential Ltd | Real estate | 2020 |
| Ceebs Solutions Limited | Professional & scientific | 2026 |
| Ceiling Tiles UK Limited | Construction | 2018 |
| Celaeno Limited | Professional & scientific | 2010 |