| Cosgrove Properties Limited | Chelmsford | 2017 |
| Cosiley Ltd | London | 2025 |
| Cosimo D'Angelo Ltd | London | 2024 |
| Coskids Ltd | Kington | 2025 |
| Coskry Holdings Ltd | Epsom | 2020 |
| Coslex Ltd | London | 2026 |
| Cosmall Ltd | London | 2025 |
| Cosmedica Limited | Maidstone | 2017 |
| Cosmeet Ltd | London | 2025 |
| Cosmess Ltd | London | 2025 |
| Cosmetic Laser Removal Ltd | Leigh-On-Sea | 2012 |
| Cosmetica Consulting Ltd | London | 2013 |
| Cosmi Realisations Limited | London | 1952 |
| Cosmic Dimensions Ltd | Haverfordwest | 2025 |
| Cosmic Kids Limited | Marlow | 2021 |
| Cosmic Riot Limited | Harrogate | 2026 |
| Cosmic Trail Investments Ltd | Manchester | 2025 |
| Cosmo Eccles Limited | Manchester | 1950 |
| Cosmo Friends Ltd | London | 2025 |
| Cosmocheck Ltd | London | 2024 |
| Cosmopolitan Fragrances & Cosmetics Ltd | Middlesex | 1986 |
| Cosmos Airforce Ltd | Basildon | 2021 |
| Cosmos Bidco Limited | Watford | 2020 |
| Cosmos EBT & Nominee Limited | Watford | 2020 |
| Cosmos Midco Limited | Watford | 2020 |
| Cosmos Partnership Limited | London | 2012 |
| Cosmos Recruit Limited | Woodford Green | 2011 |
| Cosmos Shipping Limited | Blackpool | 2023 |
| Cosmos Topco Limited | Watford | 2020 |
| Cosmuses Cosmetic International Group Ltd | London | 2014 |
| Cosro Limited | Cobham | 2001 |
| Cost Craft Solutions Ltd | Preston | 2024 |
| Costa Coffee Limited | Gillingham | 2005 |
| Costa DEL SOL FOX Ltd | London | 2013 |
| Costa Spring Hatchery Limited | Clitheroe | 1995 |
| Costa Team Ltd | London | 2017 |
| Costain Energy Solutions Limited | London | 2012 |
| Costain OIL, GAS & Process (Overseas) Limited | London | 1957 |
| Costech Ltd | Liverpool | 2020 |
| Costello Engineering and Technical Services Limited | Pride Park | 2019 |
| Costello`S Electrical Contractors Limited | Altrincham | 2007 |
| Costi Style Limited | London | 2025 |
| Costs Consortium Limited | Bridgend | 2002 |
| Costume Boutique Limited | London | 2011 |
| Costumes for Kids Limited | Stoke-On-Trent | 2006 |
| Cosvet Capital Ltd | London | 2005 |
| Cosy Casa Home Ltd | Ashbourne | 2024 |
| Cosy Couture Hotel Group Ltd | Malvern | 2015 |
| Cosy Haven & Services Ltd | Manchester | 2025 |
| Cosy Hub Ltd | Batley | 2023 |
| Cosy Logs Limited | Kendal | 2020 |
| Cosy Pet Limited | Ringwood | 2021 |
| Cosyfloor Limited | Glenrothes | 2022 |
| Cotax Limited | Aylesbury | 2003 |
| Cote Azur Tender Group Ltd | London | 2025 |
| Cote Restaurant Collection Limited | London | 2020 |
| Cote Wall Mews Property Co. Limited | Mirfield | 1996 |
| Cotec Xintuo International Limited | London | 2025 |
| Cotech Aviation Limited | Wilden | 2018 |
| Coteglade Limited | Swansea | 1973 |
| Coterie Galleries Limited | Harrogate | 2022 |
| Cothon Limited | Wellingborough | 2021 |
| Coton Hall Developments Limited | Stoke-On-Trent | 2012 |
| Cotslab Limited | Beckenham | 2021 |
| Cotswold Village Investments Limited | London | 2018 |
| Cotswold & Chiltern Master Thatchers Limited | Northampton | 2005 |
| Cotswold & Stateside Coffee Company Limited | Bidford-On-Avon | 1993 |
| Cotswold Accounting Limited | Cheltenham | 2026 |
| Cotswold Airport Holding Co Limited | Cirencester | 2019 |
| Cotswold Caterham Limited | Stonehouse | 2015 |
| Cotswold Cookie Company Limited | Gloucester | 2001 |
| Cotswold Creative Landscapes Ltd | Fairford | 2022 |
| Cotswold Estate Services Limited | Cirencester | 1993 |
| Cotswold Flats Limited | Bangor | 1984 |
| Cotswold Fudge Co. Limited | Chipping Norton | 2008 |
| Cotswold Galleries Limited | Chipping Campden | 2011 |
| Cotswold Home Inspectors Limited | Cirencester | 2014 |
| Cotswold Housekeeping Ltd | Chipping Norton | 2024 |
| Cotswold Investors Ltd | Bristol | 2022 |
| Cotswold Jewellery Ltd | Evesham | 2021 |
| Cotswold Landscapes Limited | Cirencester | 1984 |
| Cotswold Memorials Limited | Evesham | 2012 |
| Cotswold Motoring Services Limited | Stonehouse | 2014 |
| Cotswold Pest Control Ltd | Shipston-On-Stour | 2015 |
| Cotswold Static Control Products Limited | Swindon | 1985 |
| Cotswold Stone Sales Limited | Chipping Norton | 1993 |
| Cotswold Stonemasonry Limited | Witney | 2004 |
| Cotswold Technology Limited | Cheltenham | 1988 |
| Cotswold View Residents Association Limited | High Wycombe | 1999 |
| Cotswold Walking Tours Ltd | London | 2011 |
| Cotswold Walks Ltd. | London | 2011 |
| Cotswold Window Company Limited | London | 2023 |
| Cotswolds (TSP Investments) Ltd | Coleby | 2022 |
| Cotswolds (TSP Operations) Ltd | Coleby | 2022 |
| Cotswolds Aromatherapy School Limited | Bourton On The Water | 2010 |
| Cotswolds Ayurveda Limited | Bourton On The Water | 2010 |
| Cotswolds Fine Wine Limited | Cirencester | 2004 |
| Cottage Contract Furnishers Limited | Manchester | 2009 |
| Cottage Craft Limited | Bradford | 1991 |
| Cottage Holidays (Carlisle) Ltd | Altrincham | 2010 |