| Cornerways Management Company (Solihull Lodge) Limited | Households | 2005 |
| Cornex Limited | Construction | 1908 |
| Cornstone Group Limited | Professional & scientific | 2024 |
| Cornstone Supplies (Birmingham) Limited | Real estate | 2010 |
| Cornwall AVE Service Management Company Limited | Households | 2022 |
| Cornwall Street Limited | Professional & scientific | 2001 |
| Coronation International Holdings Limited | Financial services | 2017 |
| Coronel Investment Ltd | Extraterritorial | 2014 |
| Corpearl Ltd | Wholesale & retail | 2025 |
| Corpguru Ltd | Professional & scientific | 2021 |
| Corporate and Private Hospitality Ltd | Hospitality | 2026 |
| Corporate Awards Ltd | Administrative & support | 2023 |
| Corporate Compliance Ltd | Real estate | 2020 |
| Corporate Dining Ltd | Hospitality | 2019 |
| Corporate Enterprise Services Ltd | Administrative & support | 2025 |
| Corporate First Limited | Financial services | 2007 |
| Corporate Property (Midlands) Limited | Real estate | 2004 |
| Corporate Property Finder UK Limited | Real estate | 2018 |
| Corporate Property Holdings Ltd | Real estate | 2023 |
| Corporate Task Training Limited | Education | 2018 |
| Corporate Tech Solutions Limited | Information & communication | 2017 |
| Corporate Temp Housing Ltd | Hospitality | 2018 |
| Corporate Transport Solutions Limited | Transport & logistics | 2014 |
| Corporate Ventures Ltd | Hospitality | 2019 |
| Corporatewear UK Limited | Wholesale & retail | 2000 |
| Corpus Christi Healthcare Limited | Administrative & support | 2016 |
| Corpus Consultants Ltd | Health & social care | 2015 |
| Corr Beauty Ltd | Other services | 2023 |
| Correct Candidate Ltd | Administrative & support | 2025 |
| Corrigan Space Solutions Ltd | Construction | 2025 |
| Corrosion & Integrity Services Ltd | Professional & scientific | 2020 |
| Corrosion Control Engineering Ltd | Professional & scientific | 2010 |
| Corrupt Sheriff Limited | Wholesale & retail | 2019 |
| Corsacious Ltd | Administrative & support | 2023 |
| Corse Partners LP | | 2016 |
| Corset Story Ltd | Wholesale & retail | 2010 |
| Corsica Group LP | | 2017 |
| Corsimolphotos Ltd | Professional & scientific | 2024 |
| Corstone Limited | Real estate | 1996 |
| Cort Oak Legal Limited | Professional & scientific | 2026 |
| Cortela 808 Ltd | Wholesale & retail | 2022 |
| Cortexcreators Ltd | Wholesale & retail | 2026 |
| Cortexive Ltd | Wholesale & retail | 2025 |
| Cortile Coffee Limited | Wholesale & retail | 2020 |
| Cortina Cleaning & Maintenance Ltd | Administrative & support | 2026 |
| Cortion Ltd | Transport & logistics | 2024 |
| Corvan Holdings Ltd | Financial services | 2025 |
| Corvan Limited | Health & social care | 1989 |
| Corvin Solutions Limited | Information & communication | 2016 |
| COS Cleaner Construction Ltd | Construction | 2023 |
| Cosan CC Limited | Professional & scientific | 2019 |
| Cosco-Ep Ltd | Manufacturing | 2023 |
| Cosecha Limited | Wholesale & retail | 2015 |
| Coseley 4X4 Ltd | Wholesale & retail | 2020 |
| Coseley 4X4 Repairs Ltd | Wholesale & retail | 2023 |
| Cosford Storage Limited | Wholesale & retail | 2023 |
| Cosinest Ltd | Construction | 2025 |
| Coslip Ltd | Transport & logistics | 2018 |
| Cosmeceuticals Limited | Wholesale & retail | 2007 |
| Cosmetic Body Repairs (WM) Ltd | Wholesale & retail | 2022 |
| Cosmetic Canvas Ltd | Health & social care | 2022 |
| Cosmetic Distribution Limited | Transport & logistics | 2024 |
| Cosmetic Surgery Allianz Limited | Health & social care | 2006 |
| Cosmetics HUT Ltd | Wholesale & retail | 2023 |
| Cosmetics R US Limited | Wholesale & retail | 2019 |
| Cosmetology LAB Limited | Health & social care | 2024 |
| Cosmetyclearance Ltd | Wholesale & retail | 2026 |
| Cosmic Automotive Engineers Ltd | Wholesale & retail | 2026 |
| Cosmic Buns Limited | Real estate | 2021 |
| Cosmic Solutions PVT Limited | Other services | 2023 |
| Cosmicgames Ltd | Manufacturing | 2020 |
| Cosmichollow Studio Ltd | Wholesale & retail | 2025 |
| Cosmichue Ltd | Information & communication | 2025 |
| Cosmo Glow Limited | Wholesale & retail | 2024 |
| Cosmo Nova Ltd | Construction | 2024 |
| Cosmos Beauty Ltd | Wholesale & retail | 2023 |
| Cosmos Capital Ltd. | Professional & scientific | 2014 |
| Cosmos Care Services Limited | Public administration | 2024 |
| Cosmos Estate Agents Limited | Real estate | 2020 |
| Cosmq London Ltd | Manufacturing | 2017 |
| Cosnia Services Ltd | Other services | 2021 |
| Cosol Digital Ltd | Wholesale & retail | 2024 |
| Cosplay Armor Ltd | Wholesale & retail | 2025 |
| Coss Limited | Administrative & support | 2025 |
| Cosslett & Barr Limited | Professional & scientific | 2018 |
| Cost Strategy Limited | Professional & scientific | 2026 |
| Costa Engineers Limited | Manufacturing | 2015 |
| Costa Transports Ltd | Transport & logistics | 2016 |
| Costas Elec Ltd | Administrative & support | 2015 |
| Costconstruction Ltd | Construction | 2021 |
| Costcut Store Ltd | Wholesale & retail | 2023 |
| Costcutter Retail Ltd | Wholesale & retail | 2026 |
| Costcutter the Point Ltd | Wholesale & retail | 2015 |
| Costel & ELY Painting and Decorating Ltd | Construction | 2023 |
| Costelciobanu Ltd | Transport & logistics | 2019 |
| Costello Construction Ltd | Construction | 2025 |
| Costello's Driveways and Landscapes Limited | Administrative & support | 2024 |
| Costello’S Housing Ltd | Health & social care | 2025 |
| Costes Cafe Bar Ltd | Hospitality | 2020 |
| Costi Limited | | 1992 |