| Correct Measures Ltd | Wholesale & retail | 2025 |
| Corrective Pain Relief Limited | Health & social care | 2022 |
| Correxo Ltd | Construction | 2020 |
| Corries International Limited | Professional & scientific | 2005 |
| Corrociv Limited | Professional & scientific | 2005 |
| Cors Llyferin Limited | Real estate | 2020 |
| Corsearch UK Limited | Information & communication | 2017 |
| Cort Vehicle Contracts Ltd | Wholesale & retail | 2005 |
| Cortex Kitchens Ltd | Manufacturing | 2024 |
| Cortex Padel Limited | Arts & recreation | 2025 |
| Cortiez Ltd | Wholesale & retail | 2024 |
| Cortile Ltd | Real estate | 2025 |
| Cortino Restaurants Limited | Hospitality | 2022 |
| Corum Education Ltd | Education | 2023 |
| Corvantis for International Trading Limited | Extraterritorial | 2026 |
| Corvex Limited | Information & communication | 2024 |
| Corvine Regale Ltd | Wholesale & retail | 2025 |
| Corvynne Ltd | Wholesale & retail | 2026 |
| Corwyn Software Limited | Information & communication | 2025 |
| COS Bookkeeping Ltd | Professional & scientific | 2022 |
| COS Bookkeeping Services Ltd | Professional & scientific | 2024 |
| COS Consultancy Limited | Administrative & support | 2009 |
| COS Male Image Ltd | Wholesale & retail | 2023 |
| COS Supplies Ltd | Wholesale & retail | 2016 |
| Cosec Champ Limited | Administrative & support | 2024 |
| Cosecutive Limited | Professional & scientific | 2018 |
| Cosgrave Properties (NW) Limited | Real estate | 2018 |
| Cosgrove Recycling Limited | Real estate | 2013 |
| Cosi Ross Limited | Administrative & support | 2023 |
| Cosine Consulting Ltd | Information & communication | 2022 |
| Cosmedician UK Limited | Administrative & support | 2024 |
| Cosmetic & Medical Training Ltd | Education | 2022 |
| Cosmetic Centre Ltd | Health & social care | 2014 |
| Cosmetic Direct Ltd | Other services | 2018 |
| Cosmetic Surgeons London Ltd | Health & social care | 2009 |
| Cosmetics Corner Ltd | Wholesale & retail | 2019 |
| Cosmetics Throne Ltd | Wholesale & retail | 2023 |
| Cosmetics Trader Ltd | Other services | 2017 |
| Cosmex Charm UR Biotechnology Co., Ltd | Wholesale & retail | 2025 |
| Cosmic Aquarium Egypt for Ornament Fishes Ltd | Wholesale & retail | 2026 |
| Cosmic Catering Ltd | Hospitality | 2023 |
| Cosmic Group Collectibles Ltd | Wholesale & retail | 2021 |
| Cosmic Heights Ltd | Real estate | 2025 |
| Cosmic TEK Ltd | Wholesale & retail | 2023 |
| Cosmic Trail Investments Ltd | Extraterritorial | 2025 |
| Cosmic Worldwide Ltd | Professional & scientific | 2025 |
| Cosmicstride Co., Ltd | Wholesale & retail | 2025 |
| Cosmindelivery Ltd | Transport & logistics | 2025 |
| Cosmo Canyon Ltd | Information & communication | 2025 |
| Cosmo Creative Content Ltd | Professional & scientific | 2022 |
| Cosmo Creative Ltd | Other services | 2025 |
| Cosmo Eccles Limited | Extraterritorial | 1950 |
| Cosmo Emporium Digital Solutions Limited | Information & communication | 2025 |
| Cosmo Fit Ltd | Wholesale & retail | 2026 |
| Cosmo Leisure Limited | Professional & scientific | 1955 |
| Cosmo Nest Ltd | Real estate | 2024 |
| Cosmo Travel Education Ltd | Information & communication | 2023 |
| Cosmoderm Ltd | Wholesale & retail | 2025 |
| Cosmor Groundworks Limited | Construction | 2020 |
| Cosmor Group Limited | Financial services | 2023 |
| Cosmos Invest Ltd | Professional & scientific | 2019 |
| Cosmos JR Limited | Real estate | 2022 |
| Cosmos Organics Ltd | Wholesale & retail | 2025 |
| Cosmos.Goods Ltd | Wholesale & retail | 2024 |
| Cosmostar Tech Ltd | Wholesale & retail | 2026 |
| Cosoro Limited | Information & communication | 2016 |
| Cosource Solutions Ltd | Administrative & support | 2018 |
| Cosplay REP. Ltd | Wholesale & retail | 2022 |
| Cosrx Ltd | Wholesale & retail | 2025 |
| Cossall Properties UK Limited | Real estate | 2024 |
| Cost Less Store Ltd | Wholesale & retail | 2020 |
| Cost Save Ltd | Wholesale & retail | 2018 |
| Costa Builders (NW) Ltd | Construction | 2018 |
| Costa Rica Limited | Real estate | 2018 |
| Costacastro Ltd | Hospitality | 2019 |
| Costack UK Ltd | Manufacturing | 2014 |
| Costal and Country Devonshire Arms Limited | Hospitality | 2019 |
| Costan Builders Ltd | Construction | 2019 |
| Costap Ltd | Real estate | 2024 |
| Costartup Ltd | Other services | 2017 |
| Costdesign 1 Ltd | Real estate | 2009 |
| Costdesign 2 Ltd | Real estate | 2011 |
| Costdesign 3 Limited | Real estate | 2021 |
| Costdesign 4 Limited | Real estate | 2021 |
| Costdesign Limited | Real estate | 1995 |
| Costello Property Invest Ltd | Real estate | 2021 |
| Costello Truck & Plant Limited | Wholesale & retail | 2024 |
| Costero Holdings Limited | Financial services | 2017 |
| Costmad Ltd | Wholesale & retail | 2024 |
| Costnav Limited | Information & communication | 2026 |
| Costop Ltd | Wholesale & retail | 2023 |
| Cosy Club Property Management Limited | Real estate | 2023 |
| Cosy Collective Ltd | Wholesale & retail | 2022 |
| Cosy Comforts Ltd | Wholesale & retail | 2023 |
| Cosy Haven & Services Ltd | Extraterritorial | 2025 |
| Cosy Homes Protective Coatings Limited | Construction | 2021 |
| Cosy Interface Limited | Real estate | 2023 |
| Cosy MCR Ltd | Hospitality | 2026 |
| Cosy Nook Coffee Ltd | Hospitality | 2025 |
| Cosy Place Properties Ltd | Real estate | 2024 |