| Chisholm ENT Ltd | Health & social care | 2011 |
| Chivenor Cross (Chivenor) Management Company Limited | Households | 2023 |
| Chiverton Holdings Ltd | Financial services | 2024 |
| Chocolate Books Ltd | Wholesale & retail | 2023 |
| Chooseyourevent Holdings Limited | Professional & scientific | 2010 |
| Chooseyourevent.Com Limited | Professional & scientific | 1999 |
| Chorley & Cooper Renovations Limited | Construction | 2013 |
| Chosenhill Ltd | Professional & scientific | 2008 |
| Chrannah Global Ltd | Financial services | 2025 |
| Chrannah Properties Limited | Real estate | 2025 |
| Chrannah Trade Shows UK Ltd | Administrative & support | 2025 |
| Chris Cowling Limited | Construction | 2023 |
| Chris Marsh Construction Limited | Construction | 2015 |
| Chris Power & Co Limited | Professional & scientific | 2023 |
| Chris Read Agricultural Contractor Limited | Agriculture & fishing | 2002 |
| Chris Samsa Limited | Other services | 2008 |
| Chris Trott & Family Property Ltd | Real estate | 2014 |
| Chunky Lumber Ltd | Manufacturing | 2023 |
| Church Farm Barn Management Limited | Households | 2020 |
| Church Lane (Baltonsborough) Management Company Limited | Households | 2015 |
| Church Lane Kingsbury Limited | Real estate | 2013 |
| Church Square Limited | Hospitality | 2016 |
| Churchill Financial Reporting Limited | Professional & scientific | 1993 |
| Churchill Medical Property Company Ltd | Real estate | 2022 |
| Churchinford and District General Stores Community Interest Company | Wholesale & retail | 2010 |
| Churston Traditional Farm Shop Ltd | Wholesale & retail | 2020 |
| Chuse Cross Woodards Apartments Management Limited | Households | 2004 |
| CHY Expert Ltd | Administrative & support | 2012 |
| CI: Creative Intelligence Limited | Professional & scientific | 2005 |
| Ciao Amore PVT Ltd | Hospitality | 2019 |
| Cilbir Ltd | Hospitality | 2024 |
| Cinderella's Cleaning Services (West Midlands) Limited | Administrative & support | 2014 |
| Cinecraft Supplies Limited | | 1973 |
| Cinemersion Limited | Information & communication | 2025 |
| CIP Bathroom Fitter Limited | Other services | 2021 |
| Cips 2025 Limited | Financial services | 2025 |
| Circus Restaurant Bath Ltd | Hospitality | 2020 |
| Cirque Energy (UK) Limited | Mining & quarrying | 1995 |
| Citizens Advice Somerset | Information & communication | 1996 |
| City & Central Investments Ltd | Administrative & support | 2017 |
| Ciuhat a Ltd | Information & communication | 2020 |
| CJ Family Properties Limited | Real estate | 2025 |
| CJC 1 Limited | Other services | 2019 |
| CJG Fire Protection Limited | Administrative & support | 2005 |
| CJM Accounting Limited | Professional & scientific | 2012 |
| CJS Carpentry & Design Limited | Manufacturing | 2018 |
| CJV Medical Limited | Health & social care | 2019 |
| CKA Consultancy Limited | Professional & scientific | 2007 |
| CKM Automotive Services Ltd | Wholesale & retail | 2023 |
| Cladfix Solutions Limited | Construction | 2017 |
| Claim the Board Limited | Hospitality | 2025 |
| Claims Consortium (Group) Limited | Extraterritorial | 2013 |
| Claims Consortium Adjusting Limited | Financial services | 2019 |
| Claims Consortium Limited | Extraterritorial | 2013 |
| Claims Consortium Training Limited | Education | 2019 |
| Claims Management Partnership LLP | | 2017 |
| Claimterm Property Management Limited | Households | 1987 |
| Claire Leigh Limited | Arts & recreation | 2002 |
| Claire's Catering Limited | Hospitality | 2002 |
| Clansoft Limited | Information & communication | 2010 |
| Clanville Residents Company Limited | Households | 1970 |
| Clanville Sawmills Limited | Real estate | 1947 |
| Claraphonics Limited | Wholesale & retail | 1996 |
| Clare Tibbs Ltd | Professional & scientific | 2018 |
| Clarity Referrals Ltd | Professional & scientific | 2024 |
| Clark Drug Advisory Limited | Health & social care | 2013 |
| Clark Legend Ltd | Financial services | 2025 |
| Clark Shaw Associates Limited | Financial services | 2023 |
| Clark Shaw Commercial Limited | Financial services | 2025 |
| Clarkes of Devon Limited | Transport & logistics | 2020 |
| Classic Build of Bath Ltd | Construction | 2015 |
| Classic Canes Limited | Wholesale & retail | 2015 |
| Classic Eggs Limited | Extraterritorial | 1999 |
| Classy Glass Home Improvement Centre Limited | Construction | 2002 |
| Claudio Cadman Ltd | Information & communication | 2008 |
| Clayton Wood Properties Limited | Real estate | 2022 |
| CLB Cleaning Services Ltd | Administrative & support | 2026 |
| Clean Energy Minerals Limited | Professional & scientific | 2021 |
| Clean Streak Ltd | Administrative & support | 2020 |
| Clean Sweep SW Limited | Administrative & support | 2012 |
| Cleanin' NO G Limited | Administrative & support | 2018 |
| Cleaning Solutions UK Ltd | Wholesale & retail | 2012 |
| Clear Eco-Roofing Limited | Construction | 2023 |
| Clear Hear Solutions Audiology Ltd | Manufacturing | 2023 |
| Clearbroking Ltd | Financial services | 2012 |
| Cleartrack CX Ltd | Information & communication | 2024 |
| Clearview Wealth Management Limited | Professional & scientific | 2024 |
| Clearwater PUB Estate Limited | Hospitality | 2015 |
| Cleerdin & Hamer Advocaten LLP | | 2015 |
| Cleere Holdings Limited | Real estate | 2022 |
| Clem Woodward Limited | Real estate | 2011 |
| Clerksroom Direct Ltd | Professional & scientific | 2014 |
| Clerksroom Holdings Limited | Financial services | 2021 |
| Clerksroom Mediation Limited | Professional & scientific | 2022 |
| Clevedon Felt Roofing Limited | Construction | 1998 |
| Click 2 Connect CIC | Professional & scientific | 2025 |
| Cliff Court (Budleigh Salterton) Limited | Households | 1994 |
| Clifton Estate Planning Ltd | Professional & scientific | 2016 |
| Clifton Hospitality Limited | Hospitality | 2011 |
| Clifton Lodge Management Co Ltd | Households | 2002 |