| Cogita.Ai Limited | Information & communication | 2025 |
| Cogito Human Resources Limited | Administrative & support | 2026 |
| Cogito Talent Limited | Professional & scientific | 2014 |
| Cognesis Limited | Professional & scientific | 2013 |
| Cogniscion Limited | Information & communication | 2017 |
| Cognisolve Ltd | Information & communication | 2017 |
| Cognitive Paths | Professional & scientific | 2016 |
| Cognizioni UK Limited | Information & communication | 2019 |
| Cohen Coaching Ltd | Education | 2010 |
| Coherence Technologies Ltd | Information & communication | 2025 |
| Cohese Healthcare Ltd | Health & social care | 2011 |
| Cohesion Hair Limited | Other services | 2001 |
| Cohort Performance Ltd | Arts & recreation | 2025 |
| Coin Hunter Limited | Wholesale & retail | 2017 |
| Coiniris Property Management Limited | Households | 1984 |
| Cojocar Ltd | Transport & logistics | 2022 |
| Cokely Cosmetic Ltd | Administrative & support | 2016 |
| Cokely Crawford Construction Ltd | Construction | 2025 |
| Coku Limited | Wholesale & retail | 2018 |
| Colab International Ltd | Professional & scientific | 2021 |
| Colbourne Global Ltd | Professional & scientific | 2023 |
| Colchester Dental Referral Centre Limited | Health & social care | 2012 |
| Colchester Lister Associates Limited | Construction | 1979 |
| Cold Case Planning Limited | Extraterritorial | 2011 |
| Cold Flame Visual Ltd | Professional & scientific | 2026 |
| Cold Tech (Services) Ltd | Manufacturing | 2012 |
| Colderstone Construction Limited | Construction | 2020 |
| Coldharbour Art Ltd | Manufacturing | 2019 |
| Coldharbour Land Limited | Real estate | 2014 |
| Coldharbour Mews Limited | Households | 2026 |
| Coldharbour Properties Limited | Real estate | 2018 |
| Coldstar (UK) Holdings Ltd | Financial services | 2019 |
| Coldstar (UK) Ltd | Construction | 2002 |
| Coldstar Developments Ltd | Real estate | 2019 |
| Cole & Co Property Management Ltd | Households | 2019 |
| Cole Cabs Ltd | Transport & logistics | 2016 |
| Cole Design Associates Limited | Professional & scientific | 2002 |
| Cole Group Design and Build Limited | Construction | 2017 |
| Cole Group Developments Limited | Real estate | 2015 |
| Cole Online Retailing Limited | Wholesale & retail | 2023 |
| Cole Plumbing & Heating Ltd | Administrative & support | 2008 |
| Colectiv Ltd | Professional & scientific | 2023 |
| Coleford Properties Ltd | Construction | 2019 |
| Colemaka Consulting Ltd | Administrative & support | 2013 |
| Coleman Hill Limited | Real estate | 2024 |
| Colemore Developments Limited | Construction | 2006 |
| Colepowered Games Ltd. | Information & communication | 2015 |
| Coleridge Court (Bedminster) Management Company Limited | Households | 2006 |
| Coleridge House (Clevedon) Limited | Households | 2009 |
| Coles Cafe Bristol Ltd | Hospitality | 2018 |
| Coles Printers Limited | Administrative & support | 2000 |
| Coleys Barbershop Ltd | Other services | 2026 |
| Colian UK Limited | Manufacturing | 1999 |
| Coliber Ltd | Construction | 2017 |
| Colin Ludwell Cars Ltd | Wholesale & retail | 2000 |
| Colin Neagle & Co Ltd. | Wholesale & retail | 2003 |
| Colina 900 Ltd | Extraterritorial | 2024 |
| Colinear Software Ltd | Information & communication | 2025 |
| Coliving 7 TEN Ltd | Construction | 2022 |
| Colkin House Limited | Real estate | 2015 |
| Coll Scaffold Holdings Ltd | Financial services | 2023 |
| Coll Scaffold Limited | Construction | 1970 |
| COLLABR8 Capital Limited | Wholesale & retail | 2021 |
| Collabz Limited | Administrative & support | 2019 |
| Collard Electrical Ltd | Construction | 2019 |
| Collard Leap Limited | Professional & scientific | 2015 |
| Collard SCS Limited | Transport & logistics | 2013 |
| Collards Caravan & Motorhome Services Ltd | Manufacturing | 2024 |
| Collards Mews Bedminster Management Limited | Households | 2005 |
| Collecteco Limited | Water & waste | 2008 |
| Collectic Ltd | Other services | 2025 |
| Collecting Cars Apac Limited | Information & communication | 2020 |
| Collecting Cars EU Limited | Information & communication | 2020 |
| Collecting Cars Private Sales Ltd | Wholesale & retail | 2023 |
| Collecting Cars UK Limited | Wholesale & retail | 2020 |
| Collecting Cars US Limited | Information & communication | 2020 |
| Collection LLC Ltd | Professional & scientific | 2026 |
| Collective Caffeination Ltd | Arts & recreation | 2018 |
| Collective Chemical Company Limited | Extraterritorial | 1996 |
| Collective Equestrian Limited | Arts & recreation | 2016 |
| Collective Festival CIC | Administrative & support | 2025 |
| Collective Robotics Ltd | Information & communication | 2026 |
| Collective Talent Limited | Arts & recreation | 2013 |
| Collector Cave Media Ltd | Wholesale & retail | 2018 |
| Collectors Cove Limited | Wholesale & retail | 2025 |
| College House (Bristol) Management Company Limited | Households | 2021 |
| Colley Lane Truck and BUS Ltd | Wholesale & retail | 2015 |
| Collie Capers of Barkshire Ltd | Wholesale & retail | 2020 |
| Collier Safeguarding Ltd. | Health & social care | 2015 |
| Collin Calvin Limited | Health & social care | 2022 |
| Collingwood Cymbals Ltd | Manufacturing | 2019 |
| Collins & Co Consultancy Ltd | Professional & scientific | 2006 |
| Collins Ecommerce Ltd | Wholesale & retail | 2025 |
| Collins Farrier Ltd | Other services | 2020 |
| Collins Group Online Ltd | Information & communication | 2010 |
| Collins Johnson Advisory LLP | | 2004 |
| Collins Johnson Corporate Services Ltd | Professional & scientific | 2001 |
| Collins Johnson International Limited | Professional & scientific | 1995 |
| Collins Johnson Legal Services LLP | | 2020 |
| Collins Property & Developments Ltd | Real estate | 2021 |