| CMT Elite Property Management Limited | Real estate | 2025 |
| Cmuk Visual Safety Limited | Wholesale & retail | 2000 |
| CNC Investment Properties Limited | Administrative & support | 2015 |
| Cnerjy Solutions Ltd | Information & communication | 2025 |
| Coach Road Wagons Ltd | Hospitality | 2022 |
| Coach Success by Nadia Ltd | Administrative & support | 2026 |
| Coast and Country Surveys Ltd | Professional & scientific | 2017 |
| Coast Cruises Limited | Transport & logistics | 2007 |
| Coast Investments Limited | Financial services | 2002 |
| Coast Kernow Ltd | Hospitality | 2024 |
| Coast Line Markings Ltd | Construction | 2021 |
| Coast Property Services Ltd | Construction | 2024 |
| Coast Residences Limited | Real estate | 2023 |
| Coast to Coast Couriers Ltd | Transport & logistics | 2020 |
| Coast to Coast Distribution Ltd | Wholesale & retail | 2018 |
| Coast UK Limited | Real estate | 2006 |
| COAST2COAST Scuba Diving Ltd | Arts & recreation | 2019 |
| Coastal Automotive Sales Ltd | Wholesale & retail | 2024 |
| Coastal Carpentry Limited | Manufacturing | 2024 |
| Coastal Coatings Marine Ltd | Manufacturing | 2024 |
| Coastal Code Limited | Information & communication | 2016 |
| Coastal Collective Events Ltd | Arts & recreation | 2026 |
| Coastal Consulting & Advisory Limited | Professional & scientific | 2025 |
| Coastal Decking Ltd | Construction | 2019 |
| Coastal Electrical Contractors Ltd | Construction | 2008 |
| Coastal Fitness Retreats Limited | Arts & recreation | 2019 |
| Coastal Heat Ltd | Construction | 2020 |
| Coastal Key Lets Property Management Company Ltd | Real estate | 2025 |
| Coastal Leisure Services Limited | Administrative & support | 2022 |
| Coastal Line Roofing Ltd | Construction | 2026 |
| Coastal Living Ltd | Information & communication | 2019 |
| Coastal Marine Limited | Manufacturing | 2019 |
| Coastal Projects Ltd | Construction | 2023 |
| Coastal Property Group South Ltd | Real estate | 2024 |
| Coastal Retreats Ltd | Real estate | 2024 |
| Coastal Skinthetics Limited | Other services | 2015 |
| Coastal Tide Ltd | Professional & scientific | 2022 |
| Coastal Traders Limited | Professional & scientific | 2021 |
| Coastal Waves Limited | Real estate | 2023 |
| Coastline Communications Ltd | Professional & scientific | 2023 |
| Coastline Construction Ltd | Construction | 2018 |
| Coastline Couriers Ltd | Transport & logistics | 2026 |
| Coastline Decorators Centre Ltd | Wholesale & retail | 2020 |
| Coastline Electrical Contractors Ltd | Administrative & support | 2017 |
| Coastline Events Ltd | Administrative & support | 2023 |
| Coastline Property Developments Limited | Real estate | 2022 |
| Coastline Resin Ltd | Construction | 2024 |
| Coattails Ltd | Other services | 2026 |
| Cobalt Incorporated Ltd | Information & communication | 2019 |
| COBALT2 Media Ltd | Information & communication | 2018 |
| Cobb Bros Garage Limited | Wholesale & retail | 2009 |
| Cobbridge Limited | Construction | 2019 |
| Cockerill-Wright Lettings Ltd | Real estate | 2025 |
| Cocktails and Bars Limited | Hospitality | 2021 |
| Cocktails and Games Limited | Hospitality | 2021 |
| Coco & TED Limited | Manufacturing | 2020 |
| Coco's Cosmetics Ltd | Other services | 2025 |
| Cocobolo Services Ltd | Other services | 2004 |
| COD Research UK Limited | Administrative & support | 2026 |
| Coda Communications Limited | Professional & scientific | 2008 |
| Coda Communications Trustee Ltd | Professional & scientific | 2024 |
| Coda UK and Ireland CIC | Information & communication | 2012 |
| Code Morph Ltd | Information & communication | 2025 |
| Code-Switch Systems Ltd | Professional & scientific | 2025 |
| Codehardy Ltd | Professional & scientific | 2024 |
| Codeless Launch Squad Ltd | Information & communication | 2020 |
| Codelynx Ltd | Information & communication | 2025 |
| Codeman Ltd | Information & communication | 2019 |
| Codeory Limited | Wholesale & retail | 2025 |
| Codereactor Limited | Information & communication | 2022 |
| Codestarted Ltd | Information & communication | 2024 |
| Codestone Estates Limited | Real estate | 2016 |
| Codestone Group Ltd. | Information & communication | 2007 |
| Codestone Solutions Limited | Information & communication | 1997 |
| Codev Limited | Information & communication | 2006 |
| Codexia Properties Ltd | Real estate | 2020 |
| Coding Bull Ltd | Information & communication | 2025 |
| Cody Capital Group Ltd | Wholesale & retail | 2025 |
| Coffee Rock Ltd | Hospitality | 2023 |
| Cofoundry Ltd | Information & communication | 2018 |
| Cognisa Ltd | Other services | 2022 |
| Cognitive Capacity Ltd | Professional & scientific | 2024 |
| Cognitive Properties Limited | Administrative & support | 2016 |
| Cohaesus Group Limited | Financial services | 2020 |
| Coherence Consulting Limited | Information & communication | 2021 |
| Coherent Games Limited | Information & communication | 2022 |
| Cohesion Consult Limited | Professional & scientific | 2014 |
| Cohesivedata Ltd | Information & communication | 2024 |
| Coin and Note Sales Limited | Wholesale & retail | 2019 |
| Coin Tempest Consulting Ltd | Information & communication | 2018 |
| Cointips LLP | | 2024 |
| Cojam Limited | Other services | 2016 |
| Coker Residential Ltd | Real estate | 2025 |
| Colab Creative Worldwide Ltd | Arts & recreation | 2026 |
| Colab Marketers Ltd | Professional & scientific | 2026 |
| Cole Clinical Enterprises Limited | Health & social care | 2012 |
| Cole Estate Acquisitions Limited | Real estate | 2012 |
| Colebrook and Sons Ltd | Other services | 2020 |
| Coleman International Limited | Real estate | 2025 |
| Colin Hookey Investment Consultants Limited | Administrative & support | 2001 |