| Clan House (Bath) Limited | Real estate | 1973 |
| Clancyinkk Ltd | Professional & scientific | 2025 |
| Clanrolla Fields Ltd | Financial services | 2025 |
| Clanrolla Holdings Ltd | Professional & scientific | 2023 |
| Clanrolla Meadow Ltd | Real estate | 2023 |
| Clare Seal Limited | Professional & scientific | 2022 |
| Clarfelt and Co Ltd | Professional & scientific | 2017 |
| Claridge Property Limited | Real estate | 2018 |
| Clarion Call Creative Ltd | Administrative & support | 2009 |
| Clarity Clifton Limited | Professional & scientific | 2003 |
| Clark & Davies Consultants Ltd | Professional & scientific | 2026 |
| Clarkson's Independent Funeral Directors Ltd | Other services | 2013 |
| Classic Bike Trackdays Limited | Arts & recreation | 2010 |
| Claverton Associates Ltd | Professional & scientific | 2013 |
| Claverton Consultancy Limited | Administrative & support | 2024 |
| Claverton Consulting Limited | Administrative & support | 2011 |
| Claverton Court Management Limited | Households | 1973 |
| Claverton Sulis Limited | Professional & scientific | 2025 |
| Claverton View Management Company Limited | Households | 1996 |
| Clean Break Properties Ltd | Real estate | 2024 |
| Clean Slate Training and Employment C.I.C. | Education | 2006 |
| Cleaner Solutions (South West) Limited | Administrative & support | 2018 |
| Clearly PR Limited | Professional & scientific | 2014 |
| Cleeves Electrical Contractors Limited | Construction | 2026 |
| Clelia Property Management Ltd | Real estate | 2014 |
| Clemworth Ltd | Financial services | 2025 |
| Cleveland Bridge Group Limited | Real estate | 2023 |
| Cleveland Place East (Bath) Limited | Households | 1993 |
| Cleveland Pools Trading Limited | Wholesale & retail | 2022 |
| Cleveland Pools Trust | Arts & recreation | 2005 |
| Cleveland Properties (Bath) Ltd | Real estate | 2017 |
| Cleveland Reach Management Company Limited | Households | 1982 |
| Cleveland Works Ltd | Real estate | 2024 |
| Cleveland Yard Management Company Limited | Households | 2008 |
| Clever Crows Limited | Information & communication | 2016 |
| CLH Engineering Ltd | Professional & scientific | 2014 |
| Click Storage Limited | Real estate | 2025 |
| Click Strategy Ltd | Information & communication | 2015 |
| CLICK2SCAN Ltd | Information & communication | 2007 |
| Clifton Automotive Limited | Wholesale & retail | 2016 |
| Clifton Boutique Bathrooms Limited | Wholesale & retail | 2011 |
| Clifton Maybank Developments Limited | Real estate | 1993 |
| Clifton Maybank Limited | Real estate | 1990 |
| Clifton Mortgages Limited | Professional & scientific | 2005 |
| Climate ER Helio Ltd | Professional & scientific | 2021 |
| Climate ER Ltd | Energy | 2019 |
| Climate Programme Partners Ltd | Professional & scientific | 2023 |
| Clinical Management Services Limited | Agriculture & fishing | 1996 |
| Clinisolve Limited | Information & communication | 2015 |
| Clipstone Collective Ltd | Other services | 2018 |
| Clnield Ltd | Information & communication | 2016 |
| CLO Exclusives Ltd | Wholesale & retail | 2022 |
| Close Park Property Limited | Real estate | 2016 |
| Closet Gnomes Ltd | Arts & recreation | 2008 |
| Cloudberry Research Limited | Education | 2012 |
| Cloudervista Ltd | Professional & scientific | 2022 |
| Cloudfind Ltd. | Information & communication | 2009 |
| Cloudstream Partners Limited | Information & communication | 2015 |
| Cloudwood Medical Services Limited | Health & social care | 2020 |
| Clover Capital Partners Limited | Financial services | 2025 |
| Clover Studio Limited | Professional & scientific | 2021 |
| Cloverscope Ltd | Construction | 2026 |
| Clsm (Bath) Limited | Real estate | 2018 |
| CLT Consultancy Limited | Professional & scientific | 2012 |
| Cluckophonic Limited | Wholesale & retail | 2025 |
| Cluckworth Consulting Limited | Information & communication | 2018 |
| Cluckworth Coops Limited | Real estate | 2018 |
| Cluny Capital Limited | Financial services | 2010 |
| CM Drylining Limited | Construction | 2012 |
| Cmkw Properties Limited | Real estate | 2021 |
| CML Computer Systems Ltd | Information & communication | 2009 |
| Co Wealth Limited | Hospitality | 2025 |
| Co&Co Properties Ltd | Real estate | 2025 |
| Co-Lab Games Limited | Information & communication | 2024 |
| Coach DEE S&C Ltd | Other services | 2021 |
| Coach Universal Ltd | Professional & scientific | 2016 |
| Coacs Trading Limited | Wholesale & retail | 2005 |
| Coact Technical Support Limited | Professional & scientific | 2022 |
| Cobb & Company,Limited | Construction | 1908 |
| Coco Lumb Ltd | Construction | 2024 |
| Cocoeasy UK Ltd | Wholesale & retail | 2021 |
| COD Down Chippy Ltd | Hospitality | 2014 |
| Code Orange Procurement Ltd | Professional & scientific | 2017 |
| Codebrave Foundation | Education | 2019 |
| Codebrave Tutors Ltd | Education | 2021 |
| Coded Cloth Ltd | Manufacturing | 2020 |
| Codeleft Limited | Information & communication | 2024 |
| Codeulike Limited | Information & communication | 2001 |
| Codeworks Ltd | Information & communication | 2022 |
| Coding Corner LLP | | 2016 |
| Coffee Diana Limited | Hospitality | 2019 |
| Coffever Ltd | Hospitality | 2022 |
| Coforest Limited | Agriculture & fishing | 2020 |
| Coformed Ltd | Professional & scientific | 2018 |
| Cogent Factors Limited | Information & communication | 2012 |
| Cogent Global Protection Ltd | Administrative & support | 2016 |
| Cognai Digital Ltd | Information & communication | 2026 |
| Cognate Design Ltd | Professional & scientific | 2023 |
| Cohegence Limited | Information & communication | 2012 |
| Cohorts LLP | | 2009 |