| Cloister Company Limited | Professional & scientific | 1995 |
| Clos TY Gwyn (Hendy) Management Company Limited | Households | 2015 |
| Cloud Nine Health Ltd | Health & social care | 2023 |
| Cloudfield Consulting Ltd | Information & communication | 2024 |
| Cloudlevel Ltd | Information & communication | 2014 |
| Clover Building Ltd | Construction | 2024 |
| Clover England Limited | Administrative & support | 2013 |
| Clover House (Cranbrook) Management Company Limited | Households | 2022 |
| Clover Telecom Limited | Information & communication | 1989 |
| Cloverley Trustees (a) Ltd | Professional & scientific | 2023 |
| Cloverley Trustees (B) Ltd | Professional & scientific | 2023 |
| Clown About Limited | Real estate | 1998 |
| Clown About Salisbury Limited | Arts & recreation | 1997 |
| Clrtrevatt Ltd | Hospitality | 2023 |
| CLS Law Limited | Professional & scientific | 2009 |
| Club Padel Group Limited | Arts & recreation | 2025 |
| Club Perks Limited | Professional & scientific | 2022 |
| Club Sixty One Limited | Wholesale & retail | 2021 |
| CM Edits Ltd | Information & communication | 2018 |
| CM TAXI4YOU Limited | Transport & logistics | 2022 |
| CMD Shft R Ltd | Professional & scientific | 2024 |
| CMF Bathrooms & Wetrooms Ltd | Construction | 2024 |
| CMF Farm Bushes Limited | Households | 2024 |
| CMF Old Barns Limited | Hospitality | 2024 |
| CMF Old Dairy Limited | Households | 2024 |
| CMF Stable Cottage Limited | Households | 2024 |
| CMP Build Ltd | Construction | 2019 |
| CMS Care Service Limited | Health & social care | 2021 |
| Cmsr Limited | Financial services | 2009 |
| Cmv-Tech Limited | Information & communication | 2014 |
| CNP Properties Ltd | Extraterritorial | 2002 |
| Co Trim Limited Partnership | | 2011 |
| Co. Jones Limited | Construction | 2018 |
| Coach Caterers (Southern) Limited | Hospitality | 1958 |
| Coach Caterers Limited | Financial services | 2018 |
| Coast 2 Coast Rentals Ltd | Administrative & support | 2020 |
| Coast Spas UK Limited | Wholesale & retail | 2023 |
| Coastland Foods Ltd | Wholesale & retail | 2025 |
| Coat Grove (Martock) Management Company Limited | Real estate | 2020 |
| Cobalt Consulting Ltd | Professional & scientific | 2009 |
| Cobalt Design Ltd. | Professional & scientific | 2003 |
| Cobalt II Limited | Administrative & support | 2001 |
| Cobra-Networks (UK) Limited | Information & communication | 2012 |
| Coco Grillo Ltd | Hospitality | 2024 |
| Code Change Ltd | Information & communication | 2013 |
| Code Crew Ltd | Information & communication | 2016 |
| Codeology Group Limited | Manufacturing | 2023 |
| Codeology Limited | Manufacturing | 2005 |
| Coffee Representative Limited | Professional & scientific | 2023 |
| Cogent Executive Holdings Limited | Professional & scientific | 2020 |
| Cokayne-Frith Land Limited | Real estate | 1998 |
| Colbolt Consultancy Catcott Limited | Real estate | 2021 |
| Colbolt Consultancy Draycot Limited | Real estate | 2021 |
| Colbolt Consultancy Hawkeridge Limited | Real estate | 2021 |
| Colbolt Consultancy Limited | Professional & scientific | 2015 |
| Colbolt Consultancy Poulton Limited | Real estate | 2021 |
| Coldharbour Lane Management (Salisbury) Company Limited | Households | 2007 |
| Colebrook Management Services Ltd | Professional & scientific | 2020 |
| Coleman Financial Compliance Limited | Professional & scientific | 2003 |
| Coleridge Court Freehold Limited | Households | 2004 |
| Coles Combines Ltd | Wholesale & retail | 2026 |
| Coles Management Solutions Limited | Professional & scientific | 2003 |
| Colfords Limited | Wholesale & retail | 2018 |
| Colin Rogers Groundwork Limited | Construction | 2012 |
| Colindale Hospital Management Company Limited | Households | 2009 |
| Collectiv Aviation Ltd | Transport & logistics | 2021 |
| Collectiv Holdings Limited | Financial services | 2023 |
| College Street (Leicester) Management Company Ltd | Real estate | 2014 |
| Collier Trustee Company Limited | Professional & scientific | 2019 |
| Collins Lettings and Developments Limited | Real estate | 2020 |
| Collins Taylor Limited | Professional & scientific | 2025 |
| Collinson Maintenance Ltd. | Construction | 2018 |
| Collinssons Limited | Construction | 2016 |
| Colmot Ltd | Financial services | 1998 |
| Colonial Brazil Limited | Wholesale & retail | 2022 |
| Colour Wheel Salisbury Ltd | Education | 2023 |
| Colston Trustees Limited | Financial services | 2009 |
| Colton Dancing Academy Ltd | Arts & recreation | 2015 |
| Columbus Yachting Limited | Professional & scientific | 2013 |
| Com.X Ltd | Information & communication | 1999 |
| Comacchio Condor Group Ltd | Real estate | 2016 |
| Comason Beauty & Training Ltd | Other services | 2021 |
| Combat COD Limited | Hospitality | 2019 |
| Comcat GAS Limited | Professional & scientific | 2024 |
| Commasav Private Limited | Information & communication | 2016 |
| Commercial Business Solutions Ltd | Administrative & support | 2017 |
| Commercial Leasing Limited | Administrative & support | 1999 |
| Commercial Partnerships and Solutions Limited | Administrative & support | 2004 |
| Commercial Supplies Limited | Wholesale & retail | 1979 |
| Comms Experts Limited | Information & communication | 2017 |
| Commskit Ltd. | Professional & scientific | 2020 |
| Commuknitty C.I.C. | Education | 2020 |
| Communagator Ltd | Information & communication | 2023 |
| Communication Shows Limited | Professional & scientific | 1989 |
| Community Money Advice South Wiltshire CIC | Financial services | 2021 |
| Complaints and Disputes Resolution Limited | Extraterritorial | 2007 |
| Complete Care (Salisbury) Limited | Public administration | 2025 |
| Complete Construction Salisbury Ltd | Construction | 2024 |
| Componix Global Limited | Wholesale & retail | 2024 |
| Compton Chamberlayne Farms Limited | Agriculture & fishing | 1997 |