| Corsham Gymnastics Academy Limited | Corsham | 2020 |
| Corsham Schoolboy Scramble Club Limited | Bristol | 2000 |
| Corsica Studios | | 2004 |
| Corsica Studios Ventures Limited | Chester | 2024 |
| Corstiaan Enterprises Limited | Ross-On-Wye | 2023 |
| Corstorphine Snooker Company Limited | Edinburgh | 1985 |
| Corte Sport Limited | Coventry | 2023 |
| Cortex Padel Limited | Manchester | 2025 |
| Cortick Limited | Glasgow | 1989 |
| Cortium Sports Limited | Purley | 2011 |
| Coru Pilates Limited | Gloucester | 2025 |
| Corvidae Clothing Limited | London | 2019 |
| Corvus Bright Ltd | London | 2022 |
| Corvus Folk CIC | Lewes | 2025 |
| Corylana Limited | Sheffield | 2018 |
| Corylus CIC | Edinburgh | 2018 |
| Cosa Nostra Music Ltd | Borehamwood | 2015 |
| Cosatu Gardeners Limited | Southampton | 2020 |
| Cosb Limited | Coventry | 2025 |
| Cosford Racing Ltd | Laurencekirk | 2026 |
| Cosm Play Ltd | Cookstown | 2023 |
| Cosmetic Canvas Art Limited | Stratford Upon Avon | 2013 |
| Cosmia Festivals Ltd | Huddersfield | 2019 |
| Cosmic 108 Ltd | Reading | 2009 |
| Cosmic Art Limited | Cardiff | 2021 |
| Cosmic Balloons Ltd | Hamilton | 2025 |
| Cosmic Chaos Ltd | Lytham St Annes | 2025 |
| Cosmic Cloud Studios Ltd | High Wycombe | 2024 |
| Cosmic Collektiv Ltd | Sheffield | 2025 |
| Cosmic Competitions Ltd | Liscard | 2023 |
| Cosmic COW Tattoo Ltd | Clitheroe | 2024 |
| Cosmic Cowboy Studio Ltd | London | 2022 |
| Cosmic Desert Disco Ltd | London | 2021 |
| Cosmic Dogs Media Co Limited | Milldenhall | 2022 |
| Cosmic Football Ltd | Southall | 2025 |
| Cosmic Keep Ltd | London | 2024 |
| Cosmic Kids Play Ltd | Belfast | 2018 |
| Cosmic Leisure Limited | Leeds | 2019 |
| Cosmic Oak Media Ltd | Wells | 2023 |
| Cosmic Red Rocket Ltd | Huntly | 2025 |
| Cosmic Rust Animations Ltd | Stoke-On-Trent | 2026 |
| Cosmic Sparkle Entertainment Ltd | Portsmouth | 2015 |
| Cosmic Studios CIC | Carlisle | 2019 |
| Cosmic Synergy Productions Ltd | London | 2024 |
| Cosmic Systems Limited | London | 2024 |
| Cosmic Theatre Ltd | London | 2022 |
| Cosmo Castles Limited | Swindon | 2021 |
| Cosmo Media Limited | London | 2022 |
| Cosmoco Limited | Hornchurch | 2013 |
| Cosmonaut Leisure Ltd | Maidenhead | 2020 |
| Cosmopolis Media Limited | London | 2006 |
| Cosmopolitan Arts CIC | Leicester | 2014 |
| Cosmopolitan Events Limited | Herne Bay | 2014 |
| Cosmopolitan Hospitality Limited | London | 2026 |
| Cosmopolitan Roses Netball Academy Ltd | Maidenhead | 2023 |
| Cosmopolite Interiors Limited | London | 2017 |
| Cosmosxp Ltd | London | 2021 |
| Costa Productions Limited | London | 2015 |
| Coste Studio Limited | London | 2026 |
| Costello Wellness Community Interest Company | Oldham | 2025 |
| Costessey Community Events C.I.C. | Norwich | 2023 |
| Costessey Park Limited | Buxton | 1997 |
| Costume 2000 Limited | Rayleigh | 1999 |
| Costume Designer UK Ltd | Bristol | 2020 |
| Costume East Ltd | Leyton | 2020 |
| Costume Studio Limited | Newtown | 1987 |
| Costume Styling Ltd | Leighton Buzzard | 2014 |
| Costumefilmstock Ltd | Bristol | 2023 |
| Cosu FC Limited | Benfleet | 2023 |
| Cosy Corner Crew Ltd | Tamworth | 2025 |
| Cosy Cubs Play Cafe Ltd | Romford | 2026 |
| Cosy Kreations Ltd | Liverpool | 2024 |
| Cosyfish Limited | Hemel Hempstead | 2019 |
| Cotham Park Tennis Club | Bristol | 2015 |
| Cothroman CIC | Oban | 2013 |
| Cotillo Limited | Edgware | 2013 |
| Coton Village Hall | Cambridge | 2009 |
| Cotswold Automotive Park Limited | London | 2019 |
| Cotswold Balloon Safaris Limited | Norwich | 2014 |
| Cotswold Children’S Parties Limited | Cheltenham | 2023 |
| Cotswold Clay Club Ltd | Stroud | 2021 |
| Cotswold Clubhouse Ltd | Cheltenham | 2017 |
| Cotswold Combat Ltd | Cirencester | 2024 |
| Cotswold Competitions Ltd | Bridgwater | 2020 |
| Cotswold Conditioning Limited | Faringdon | 2021 |
| Cotswold Country Fair Limited | Cirencester | 1989 |
| Cotswold Country Pursuits Limited | Dover | 2016 |
| Cotswold Driving Experiences Ltd | Cirencester | 2021 |
| Cotswold Edge Golf Club Limited | Wotton Under Edge, | 1977 |
| Cotswold Elite Coaching Limited | Gloucester | 2025 |
| Cotswold Exercise Referral CIC | Cheltenham | 2024 |
| Cotswold Falconry Limited | Moreton-In-Marsh | 2008 |
| Cotswold Farm Park Limited | Cheltenham | 2004 |
| Cotswold Fest Limited | Fairford | 2023 |
| Cotswold Gliding Club Limited | Stroud | 2018 |
| Cotswold Hills Golf Club Limited (the) | Cheltenham | 1973 |
| Cotswold Mainline Diesel Group Limited | Cardiff | 2023 |
| Cotswold Motor Sport Group Competitors Club Ltd | Cheltenham | 2023 |
| Cotswold Netball League Limited | Chipping Campden | 2019 |
| Cotswold Party Ltd | Malmesbury | 2017 |