| Core Midlands Ltd | Administrative & support | 2025 |
| Core P.I.C. Group Ltd | Administrative & support | 2017 |
| Core Sono Diagnostics Ltd | Health & social care | 2026 |
| Core Urban ERA Ltd | Wholesale & retail | 2026 |
| Core VR Limited | Information & communication | 2019 |
| Corecast Ltd | Construction | 2014 |
| Corelink Rail Infrastructure Holdings Limited | Financial services | 2017 |
| Corelink Rail Infrastructure Limited | Manufacturing | 2017 |
| Coresix Healthcare Limited | Health & social care | 2025 |
| Corewear Limited | Wholesale & retail | 2025 |
| Corfield Property Group Ltd | Financial services | 2025 |
| Corfu Limited | Wholesale & retail | 2010 |
| Corley Capital Limited | Professional & scientific | 2016 |
| Corlow Rail Ltd | Professional & scientific | 2023 |
| Cormac Projects Limited | Construction | 2025 |
| Corn Exchange Sports Bar Ltd | Arts & recreation | 2018 |
| Cornelius Fizz Limited | Professional & scientific | 2025 |
| Corner Fields Management Company Limited | Households | 2018 |
| Corner Shop Derby Limited | Wholesale & retail | 2025 |
| Cornerbrook Limited | Professional & scientific | 2022 |
| Cornerstone Food Supply Ltd | Hospitality | 2026 |
| Cornerstone Growth Ltd | Professional & scientific | 2026 |
| Cornerstone Timber Ltd | Administrative & support | 2025 |
| Cornforth Developments Ltd | Real estate | 2023 |
| Cornshire EOT Limited | Administrative & support | 2024 |
| Cornshire Limited | Professional & scientific | 1988 |
| Cornwall Healthcare Group Ltd | Financial services | 2026 |
| Cornwell Carpets and Flooring Limited | Wholesale & retail | 2011 |
| Coronation Care Services Ltd | Real estate | 2024 |
| Coronation Road Transport Limited | Wholesale & retail | 2017 |
| Corpora.Ai Limited | Information & communication | 2017 |
| Corporate Angel Promotions Ltd | Administrative & support | 2016 |
| Corporate Apartments UK Limited | Real estate | 2023 |
| Corporate Aviation Services Limited | Transport & logistics | 1989 |
| Corporate Entertainments UK Limited | | 2009 |
| Corpus Pet Funeral and Cremations Ltd | Other services | 2020 |
| Corrivo Building Products Limited | Manufacturing | 2000 |
| Corrivo Holdings Ltd | Financial services | 2014 |
| Cortex Properties Ltd | Real estate | 2024 |
| Corua Ltd. | Transport & logistics | 2020 |
| Corvos Ltd | Financial services | 2015 |
| Cosmetize Derby Ltd | Other services | 2018 |
| Cosmic Campervans Limited | Wholesale & retail | 2017 |
| Cosmic Concepts Limited | Information & communication | 2002 |
| Cosmic Pancakes Limited | Professional & scientific | 2019 |
| Costock Caravans Ltd | Administrative & support | 2007 |
| Cosvo Limited | Wholesale & retail | 2023 |
| Cote House Estate Limited | Real estate | 2025 |
| Cotswolds & Coast Limited | Real estate | 2024 |
| Cottage BED and Breakfast Limited | Hospitality | 2015 |
| Cottage Filling Station Ltd | Wholesale & retail | 2024 |
| Cottage Service Station Ltd | Wholesale & retail | 2013 |
| Countany Limited | Other services | 1987 |
| Counter Solutions U.K. Limited | Wholesale & retail | 2008 |
| Country Lodges Privé Ltd | Hospitality | 2019 |
| Countryman of Derby Limited | Wholesale & retail | 2003 |
| Countryside Connect CIC | Education | 2024 |
| County Estate Developments Limited | Real estate | 1989 |
| County GAS and Heating Ltd | Construction | 2024 |
| Couriflex Logistics Ltd | Transport & logistics | 2026 |
| Courseworks Limited | Administrative & support | 2002 |
| Courtesy Healthcare Ltd | Hospitality | 2020 |
| Courtland Antiques Limited | Wholesale & retail | 2003 |
| Courtyard Consultancy Ltd | Professional & scientific | 2020 |
| Courtyard Mews Management Company Ltd | Real estate | 2014 |
| Courtyard Place Management Company Limited | Administrative & support | 2004 |
| Cove Create Ltd | Manufacturing | 2023 |
| Cover ALL Angles Limited | Administrative & support | 2025 |
| Covmind UK Limited | Financial services | 2018 |
| COW Belle Pubs Limited | Hospitality | 2023 |
| COW Dyke Farm Harrogate LLP | | 2025 |
| COW Limited | Professional & scientific | 2015 |
| Cowick Investments Limited | Administrative & support | 2021 |
| Cowley Investments Limited | Construction | 2011 |
| Cowling Cycle Parts Ltd | Wholesale & retail | 2022 |
| Cowrie Homes Limited | Real estate | 2022 |
| Coxbench Hall Limited | Health & social care | 1983 |
| Coxon Street Four Limited | Administrative & support | 2017 |
| Coxon Street Nineteen Limited | Professional & scientific | 2022 |
| Coxon Street TEN Limited | Real estate | 2018 |
| Coxon Street Thirty Five Limited | Professional & scientific | 2026 |
| Coxon Street Thirty Four Limited | Professional & scientific | 2026 |
| Coxon Street Thirty Limited | Professional & scientific | 2025 |
| Coxon Street Thirty One Limited | Professional & scientific | 2025 |
| Coxon Street Thirty Three Limited | Professional & scientific | 2026 |
| Coxon Street Thirty Two Limited | Professional & scientific | 2026 |
| Coxon Street Three Limited | Administrative & support | 2017 |
| Coyle&Co Ltd | Information & communication | 2024 |
| Coyne Enterprises Ltd | Wholesale & retail | 2025 |
| Cozia Systems Ltd | Wholesale & retail | 2021 |
| CP Auto Ltd | Wholesale & retail | 2025 |
| CPA Mechanical Engineering Ltd | Manufacturing | 2014 |
| CPB Financial Services Limited | Financial services | 2022 |
| CPG Technology Consulting Limited | Information & communication | 2015 |
| CPH Electrical Limited | Construction | 2014 |
| CPI Property Holdings Ltd | Real estate | 2018 |
| CPJ Consultant Ltd | Real estate | 2019 |
| CPJ Law Ltd | Professional & scientific | 2025 |
| CPJ Property & Land Sourcing Ltd | Construction | 2020 |
| CPL Air Conditioning Limited | Energy | 2026 |