| Corvit Ltd | Construction | 2021 |
| Corza Limited | Construction | 2026 |
| COS Hospitality Consultancy Ltd | Professional & scientific | 2026 |
| Cosey Lets Ltd | Real estate | 2024 |
| Cosmabuild Ltd | Construction | 2025 |
| Cosmedic Consultancy Limited | Professional & scientific | 2023 |
| Cosmen Limited | Other services | 2023 |
| Cosmic LAB Apps Ltd | Information & communication | 2019 |
| Cosmique Ltd | Hospitality | 2019 |
| Cosmodia Global Solutions Ltd | Information & communication | 2009 |
| Cosmos Connects Ltd | Wholesale & retail | 2022 |
| Cosmos Electrical Contractors Limited | Construction | 2018 |
| Cosmos Gardens Ltd | Administrative & support | 2017 |
| Cosmostar Co. Ltd | Professional & scientific | 2024 |
| Cosofo Ltd | Wholesale & retail | 2020 |
| Cossall Farm Ltd | Real estate | 2026 |
| Cost Engineering Ltd | Construction | 2020 |
| Costa Care Limited | Health & social care | 2025 |
| Costici Ltd | Transport & logistics | 2025 |
| Costin Electric Ltd | Construction | 2021 |
| Cosy Abode Ltd | Construction | 2025 |
| Cosy Chair Company Ltd | Professional & scientific | 2014 |
| Cosy Cwtch Ltd | Real estate | 2016 |
| Cosy Garden Rooms Ltd | Construction | 2021 |
| Cosy Holmes Limited | Wholesale & retail | 2026 |
| Cosy Home Comforts Ltd | Wholesale & retail | 2017 |
| Cosy Home Renewables Ltd | Construction | 2026 |
| Cosy Interiors UK Ltd | Wholesale & retail | 2021 |
| Cosy Nests Furniture Ltd | Other services | 2025 |
| Cosybox Alfreton Road Limited | Construction | 2017 |
| Cosycribz Limited | Real estate | 2024 |
| COT Properties Ltd | Real estate | 2023 |
| Coteswood House Limited | Education | 2014 |
| Cotex Ltd | Wholesale & retail | 2009 |
| Cotgrave Barber Ltd | Other services | 2026 |
| Cotgrave Eyecare Ltd. | Health & social care | 2013 |
| Cotillo Shop Ltd | Wholesale & retail | 2024 |
| Cotswolds Hotel Limited | Hospitality | 2023 |
| Cotswood Investment Limited | Administrative & support | 2024 |
| Cottage Balti Limited | Hospitality | 2019 |
| Cottage Club Ltd | Manufacturing | 2025 |
| Cotterill & Cotterill Ltd | Education | 2023 |
| Cotton and Cowrie Ltd | Wholesale & retail | 2026 |
| Coudemy Ltd | Education | 2022 |
| Cougar Extreme Limited | Information & communication | 2007 |
| Couloir Junkie Consulting Ltd | Professional & scientific | 2021 |
| Coundon Manor Holdings Ltd | Financial services | 2026 |
| Coundon Manor Ltd | Health & social care | 2026 |
| Counselling and Psychotherapy (Nottingham) Ltd | Administrative & support | 2019 |
| Counselling Services Nottingham Limited | Health & social care | 2013 |
| Counselling Spring and Bloom Limited | Education | 2020 |
| Counselling Training the Midlands Community Interest Company | Education | 2012 |
| Count of 13 Ltd | Information & communication | 2024 |
| Country Home Interiors Ltd | Wholesale & retail | 2014 |
| Country Park Contracts Ltd | Construction | 2014 |
| Countryside Adventures Ltd | Transport & logistics | 2022 |
| Countrywide Children Homes Ltd | Health & social care | 2025 |
| Countrywide Lodges Limited | Hospitality | 2020 |
| Countrywide Park and Leisure Homes Ltd | Real estate | 2021 |
| Countrywide Park Homes Limited | Hospitality | 2014 |
| Countrywide Sealants Limited | Construction | 2024 |
| County Asphalt Limited | Construction | 2017 |
| County Cars (Nottingham) Limited | Transport & logistics | 2014 |
| County Flooring & Supplies Ltd | Wholesale & retail | 2015 |
| County Hardware Limited | Wholesale & retail | 2017 |
| County Lifts Limited | Manufacturing | 2002 |
| County Property Company (Midlands) Ltd | Real estate | 2020 |
| County Scales Limited | Manufacturing | 2002 |
| County Way Management Company Limited | Households | 1998 |
| Countyline Mobility Transport Limited | Transport & logistics | 2021 |
| Coupland Consultants Limited | Professional & scientific | 2005 |
| Coupons Limited | Administrative & support | 2019 |
| Courageous Career Women Limited | Professional & scientific | 2021 |
| Courier Exchange Europe Ltd | Administrative & support | 2005 |
| Courier King Logistics Ltd | Transport & logistics | 2024 |
| Courierx Limited | Transport & logistics | 2026 |
| Course Explorer Ltd | Extraterritorial | 2013 |
| Course X Ltd | Education | 2022 |
| Court Assist UK Limited | Health & social care | 2017 |
| Court DE Padel Hull Limited | Arts & recreation | 2025 |
| Court DE Padel Limited | Arts & recreation | 2025 |
| Court DE Padel Newcastle Limited | Arts & recreation | 2025 |
| Court DE Padel Norwich Limited | Arts & recreation | 2025 |
| Court DE Padel Prestatyn Limited | Arts & recreation | 2026 |
| Court DE Padel Stoke Limited | Arts & recreation | 2025 |
| Courtaulds Brands Limited | Manufacturing | 2006 |
| Courtaulds Textiles (Overseas) Limited | Professional & scientific | 1898 |
| Courtaulds Textiles Investments Limited | Professional & scientific | 1960 |
| Courthouse Credit Management Limited | Administrative & support | 1998 |
| Courtlab (Leicester) Limited | Arts & recreation | 2024 |
| Courtlab Holdings Limited | Financial services | 2026 |
| Coutts Fine Art International Ltd | Arts & recreation | 2020 |
| Couture Wedding Films Limited | Information & communication | 2019 |
| COUTURE2025 Ltd | Wholesale & retail | 2025 |
| Cova Works Ltd | Manufacturing | 2026 |
| Covaci Ltd | Construction | 2022 |
| Covall Workwear Ltd | Wholesale & retail | 2023 |
| Cover Contracts Limited | Construction | 2012 |
| Covercraft Upholstery Limited | Manufacturing | 2002 |
| Covert Engineering Ltd | Professional & scientific | 2023 |