| Coldharbour Partners Ltd. | Professional & scientific | 2017 |
| Colin Cook Physiotherapy Limited | Health & social care | 2003 |
| Collaboration Digital Ltd | Information & communication | 2020 |
| Collins and Thomas Limited | Professional & scientific | 2020 |
| Collins Roofing SW Ltd | Construction | 2024 |
| Colliver Consulting Ltd | Professional & scientific | 2020 |
| Colour Preferences Limited | Professional & scientific | 2013 |
| Colrosa Studios Ltd | Information & communication | 2025 |
| Colson Retail Limited | Wholesale & retail | 2014 |
| Colt Grips Ltd | Information & communication | 2026 |
| Columbus House Land Ltd | Households | 2010 |
| Columbus House Limited | Households | 1999 |
| Combe Down (Bath) Allotments CIC | Other services | 2025 |
| Combe Down (Bath) Developments Limited | Construction | 2017 |
| Combe Down Garage Limited | Wholesale & retail | 2024 |
| Combe Down Holiday Trust | Health & social care | 1993 |
| Combe Down Inns Ltd | Hospitality | 2023 |
| Combe Down Nursery Limited | Education | 2008 |
| Combe Down Property Limited | Real estate | 2024 |
| Combe Down RFC Limited | Professional & scientific | 2018 |
| Combe Down Stone Legacy Trust | Arts & recreation | 2012 |
| Combe HAY Vineyard Ltd | Agriculture & fishing | 2021 |
| Combe Royal Crescent (Bath) Company Limited | Households | 2000 |
| Combined Financial Strategies Limited | Financial services | 2008 |
| Comcepts Limited | Information & communication | 1998 |
| Command Construction Ltd | Construction | 2019 |
| Common & Thompson Limited | Professional & scientific | 2009 |
| Common Goal (UK) Ltd | Education | 2010 |
| COMMS4DOCS Limited | Education | 2019 |
| Communication IQ Limited | Administrative & support | 2020 |
| Companions WHO Care Ltd | Health & social care | 2023 |
| Company 0426 Limited | Financial services | 2026 |
| Compass Innovation Limited | Information & communication | 2026 |
| Compleo Charging Solutions UK Limited | Administrative & support | 2017 |
| Complete Control (UK) Limited | Information & communication | 1996 |
| Complex Adaptive Leadership Limited | Professional & scientific | 2011 |
| Compliwood Ltd | Administrative & support | 2024 |
| Complywithme Limited | Administrative & support | 2016 |
| Compound Footwear Ltd | Manufacturing | 2022 |
| Computis Ltd | Professional & scientific | 2021 |
| Comtecs Associates LLP | | 2010 |
| Comtecs Limited | Administrative & support | 2000 |
| Concept Entertainment Group Ltd | Arts & recreation | 2018 |
| Concept Walls and Floors Ltd | Construction | 2014 |
| CONCEPT2REALITY (Bath) Limited | Professional & scientific | 2013 |
| Concert Studio Ltd | Professional & scientific | 2025 |
| Concerts From Scratch Limited | Professional & scientific | 1996 |
| Concinnity Consultancy Limited | Other services | 2017 |
| Concorde Click Ltd | Wholesale & retail | 2015 |
| Concorde Print Solutions Limited | Construction | 2010 |
| Concours House Limited | Transport & logistics | 2025 |
| Concrete Telly Limited | Information & communication | 2011 |
| Confidebat Consulting Ltd | Information & communication | 2023 |
| Configo Software Ltd | Information & communication | 2021 |
| Congruent Design Solutions Ltd | Professional & scientific | 2019 |
| Conker Events Limited | Administrative & support | 2016 |
| Conker Property Ltd | Real estate | 2024 |
| Connect Compliance Limited | Professional & scientific | 2015 |
| Connected Management Services Limited | Manufacturing | 2025 |
| Connections Electrical Limited | Construction | 2010 |
| Connell Construction (South West) Limited | Construction | 2004 |
| Connell Haulage and Plant Ltd | Transport & logistics | 2019 |
| Connell Operations Ltd | Financial services | 2019 |
| Conquistador Ltd | Real estate | 2016 |
| Conscious Creators Ltd. | Professional & scientific | 2017 |
| Conservation Book Publishers Ltd | Wholesale & retail | 2019 |
| Consiglieri Consulting Limited | Professional & scientific | 2014 |
| Consilium Aquis Sulis Limited | Professional & scientific | 2023 |
| Consolite Holdings Limited | Professional & scientific | 2008 |
| Consolite Technology Limited | Manufacturing | 1980 |
| Constanti Planning Ltd | Professional & scientific | 2026 |
| Constellate.Insight Ltd | Professional & scientific | 2024 |
| Construct Media Ltd | Professional & scientific | 2020 |
| Construction Clan Ltd | Construction | 2020 |
| Construction EN Limited | Construction | 2020 |
| Construction Equiphire Limited | Administrative & support | 2025 |
| Construction Training Services Ltd | Education | 2020 |
| Consulting JSG Ltd | Professional & scientific | 2014 |
| Consulting ME Ltd | Professional & scientific | 2019 |
| CONSULTING404 Ltd | Professional & scientific | 2021 |
| Consultworks Ltd | Professional & scientific | 2025 |
| Contemporary Art Asia Limited | Wholesale & retail | 2016 |
| Contented Communications Ltd | Professional & scientific | 2025 |
| Context Planning Ltd | Professional & scientific | 2018 |
| Continental Trade (Bath) Limited | Real estate | 1963 |
| Continu-Forms Holdings PLC | Extraterritorial | 1993 |
| Continuum Systems Limited. | Professional & scientific | 2003 |
| Contracts Advance Limited | Information & communication | 2007 |
| Control SEE Limited | Other services | 2024 |
| Conversafe LLP | | 2024 |
| Conversulting Limited | Professional & scientific | 2012 |
| Convincing People Limited | Information & communication | 2015 |
| Conztruct Ltd | Construction | 2025 |
| Cooked in House Ltd | Hospitality | 2025 |
| Cookie Construction Company Ltd | Construction | 2025 |
| Cookie Dough Franchise Ltd | Wholesale & retail | 2013 |
| Cookie Dough Retail Trading Ltd | Administrative & support | 2014 |
| Coombs Property Group Limited | Real estate | 2016 |
| Cooper Accountancy Bath Ltd | Professional & scientific | 2020 |
| Cooper Cavendish LLP | | 2016 |