| Burj at the Bell Ltd | Hospitality | 2023 |
| Burnt Lemon Theatre Ltd | Arts & recreation | 2018 |
| Burton & Burton Limited | Professional & scientific | 1991 |
| Business Counsel Limited | Professional & scientific | 2012 |
| Butler Bros. (Avebury) Holdings Limited | Professional & scientific | 1989 |
| Butler Bros.(Avebury)Limited | Agriculture & fishing | 1955 |
| Butler's Window Cleaning Services Limited | Other services | 2003 |
| BW Barbers Limited | Other services | 2022 |
| C & D Contractors West Limited | Construction | 2021 |
| C Lewis Consultancy Limited | Wholesale & retail | 2024 |
| C M Loney Electrical Services Limited | Construction | 2010 |
| C.E.W Builders Limited | Construction | 2012 |
| C.I.C. BEE Keepers Community Interest Company | Extraterritorial | 2019 |
| C.W.C. Holdings Limited | Construction | 1991 |
| CA2301 Ltd | Professional & scientific | 2015 |
| Cactusom Ltd | Professional & scientific | 2022 |
| Campbell Gordon Consultancy Ltd | Financial services | 2023 |
| Canalside Consulting Ltd | Professional & scientific | 2020 |
| Cape Black Limited | Other services | 2025 |
| Capiche Perfection Ltd | Professional & scientific | 2025 |
| Cardan Contracting Ltd | Professional & scientific | 2024 |
| Cardan Properties Limited | Real estate | 2018 |
| Cardinal Coffee Shop Limited | Hospitality | 2023 |
| Care Directions Limited | Health & social care | 2011 |
| Caro Strover-Green and Associates Ltd | Education | 2025 |
| Carver Development Limited | Agriculture & fishing | 2010 |
| CCA Carpentry (South West) Limited | Construction | 2011 |
| CCA Carpentry Limited | Construction | 2019 |
| CDS Estates Limited | Households | 2017 |
| Cdsilighting Ltd | Wholesale & retail | 2014 |
| Cedar Tree Marketing and Public Relations Limited | Administrative & support | 2008 |
| CG2 Limited | Health & social care | 2024 |
| Chalamain Consulting Limited | Professional & scientific | 2021 |
| Chale Holdings Limited | Financial services | 2022 |
| Chalky's Workshop Limited | Wholesale & retail | 2018 |
| Chaly Limited | Professional & scientific | 2026 |
| Chandem Ltd | Real estate | 2025 |
| Chartwell Partners Ltd | Administrative & support | 2007 |
| Cheaper Than a Skip (Wiltshire) Ltd | Transport & logistics | 2023 |
| Cheverell Limited | Manufacturing | 2013 |
| Choices HR Ltd | Professional & scientific | 2012 |
| Chris Brennan Limited | Construction | 2010 |
| Chris Pritchard Roofing Ltd | Construction | 2015 |
| Chris Wheeler Construction Limited | Construction | 1985 |
| Christopher James Automotive Ltd | Wholesale & retail | 2023 |
| Chute Causeway 2021 Limited | Other services | 2021 |
| Cider Tree Partners Limited | Extraterritorial | 2018 |
| Claridge Funeral Service Ltd | Other services | 2017 |
| Clarity Automotive Consultancy Ltd | Professional & scientific | 2025 |
| Clarks Consulting Limited | Professional & scientific | 2014 |
| Clarks External Services Limited | Construction | 2024 |
| Classic Reproductions Ltd | Wholesale & retail | 2014 |
| Clear Crew Solutions Ltd | Wholesale & retail | 2025 |
| Cliff Olley Properties Ltd | Real estate | 2019 |
| Clml Limited | Education | 2024 |
| Cloud 9 Publishing Limited | Information & communication | 2000 |
| Clover London Limited | Administrative & support | 2022 |
| Cloverlait Limited | Agriculture & fishing | 2005 |
| Cmjt Services Limited | Administrative & support | 2012 |
| Cnmcl Ltd | Water & waste | 2025 |
| Codefusion Web Design Limited | Information & communication | 2023 |
| Coefficiency Limited | Professional & scientific | 2005 |
| Colamet Limited | Professional & scientific | 2000 |
| Collingbourne Limited | Professional & scientific | 2006 |
| Commercial Reality Limited | Professional & scientific | 1989 |
| Complete Glazing Services Limited | Wholesale & retail | 2003 |
| Complete the Mosaic Ltd | Information & communication | 2024 |
| Compton Bassett (Spreckley Park) Residents Association Limited | Households | 1987 |
| Compton Bassett (the Oaks) Residents Association Limited | Real estate | 1989 |
| Concise Africa Ltd | Professional & scientific | 2025 |
| Concise Strategy Ltd | Professional & scientific | 2013 |
| Conigre Resourcing Limited | Financial services | 2024 |
| Conscious Capital Limited | Administrative & support | 2017 |
| Construction Claims Consultants Limited | Professional & scientific | 1988 |
| Consult 4 U Limited | Professional & scientific | 2009 |
| Conversion Expert Limited | Professional & scientific | 2012 |
| Cooks Construction Ltd | Wholesale & retail | 2024 |
| Copper Ridge Consulting Limited | Information & communication | 2023 |
| Core Club Racing Ltd | Arts & recreation | 2021 |
| Costcutter Wiltshire Ltd | Wholesale & retail | 2014 |
| Cotswold Tree Surgeons Limited | Agriculture & fishing | 2019 |
| Countryside Contractors Limited | Administrative & support | 2014 |
| CP168 RTM Company Limited | Households | 2019 |
| Craig Witheford Ltd | Arts & recreation | 2021 |
| Cranborne Partners Ltd | Information & communication | 2019 |
| Crean & Company Ltd | Wholesale & retail | 2020 |
| Creative Difference Incorporated Limited | Administrative & support | 2008 |
| Croft Rooms Ltd | Construction | 2022 |
| Crookwood Limited | Manufacturing | 2024 |
| Cross Keys Construction Limited | Construction | 2017 |
| Crowood Developments Ltd | Construction | 2025 |
| Croxup Hosier Limited | Financial services | 2025 |
| Cruise England Limited | Arts & recreation | 2001 |
| Culture Included Limited | Professional & scientific | 2024 |
| Curl UP & DYE Limited | Other services | 2003 |
| Curriculum Enterprise Limited | Education | 1995 |
| Curtain and Blind Installation Limited | Other services | 2018 |
| Cutforth Farming Limited | Agriculture & fishing | 1994 |
| CWA Consulting Ltd | Professional & scientific | 2019 |
| Cynren Limited | Professional & scientific | 2010 |