| Cool Case Company (UK) Limited | Merseyside | 1991 |
| Cool Clear Water Ltd | Southampton | 2023 |
| Cool Cuddle Ltd. | London | 2022 |
| Cool DC Technologies Ltd | Belfast | 2017 |
| Cool Energy Limited | Totton, Southampton | 2003 |
| Cool FOX Retail Ltd | Ilfracombe | 2015 |
| Cool Kegs Cellar Cooling Limited | Gateshead | 2023 |
| Cool Logistics Limited | Bristol | 2014 |
| Cool Motion Refrigerated Vehicle Rental Limited | Milton Keynes | 2016 |
| Cool Move Limited | Clitheroe | 2025 |
| Cool Norfolk Ltd | Norwich | 2007 |
| Cool Play Brands Limited | Cardiff | 2021 |
| Cool Portable Air Conditioning Limited | Aldermaston | 2012 |
| Cool Rent Ltd | Clitheroe | 2011 |
| Cool Rivers Media Ltd. | Waterlooville | 2023 |
| Cool Solutions Applied Heat Ltd | Leeds | 2023 |
| Cool Tots Music Limited | Bedford | 2025 |
| Cool-Therm (Wales) Limited | Walsall | 2008 |
| Coolbellup Investments Ltd | Hampton | 2016 |
| Cooldle Limited | London | 2015 |
| Coole Barns Management Limited | Stoke-On-Trent | 2014 |
| Coolectric Limited | Herne Bay | 1984 |
| Cooley Spring Water Ltd | Castlewellan | 2011 |
| Cooley Water Ltd | Castlewellan | 2011 |
| Coolhua Trading Co Ltd | Kingsbury | 2021 |
| Coolmount Management Company Limited | Co Tyrone | 2006 |
| Coolrad Ltd | Ashtead | 2019 |
| Coolscape Ltd | Oakley | 2024 |
| Coolshik Ltd | London | 2025 |
| Coolships 2 Limited | Hessle | 2012 |
| Coolships 3 Limited | Hull | 2016 |
| Coolships UK Limited | Hull | 2009 |
| Coolshock Limited | Sutton Coldfield | 2018 |
| Coolsouk Ltd | London | 2024 |
| Cooltrader Limited | Liverpool | 2012 |
| Coolwhite Ltd | Salford | 2013 |
| Coolzone Ltd | Bourne End | 2020 |
| Coomacarrea Limited | London | 2026 |
| Coombe Avenue Investments Limited | Croydon | 1960 |
| Coombe Farm Organic Limited | Crewkerne | 2015 |
| Coombe Farm Organic Milk Pool Ltd | Crewkerne | 2017 |
| Coombe Garage Tyres Limited | Winchester | 2009 |
| Coombe Road Management Company Limited | Croydon | 2014 |
| Coombelands Lane 14/02/1961 Limited | Pulborough | 2014 |
| Coombelea Limited | London | 2002 |
| Coombes & Sons(Bovey Tracey)Limited | Sutton Coldfield | 1965 |
| Coombes Arboriculture Limited | Petersfield | 2018 |
| Coombes Civils Limited | Petersfield | 2017 |
| Coombeshead Farm Bakery Ltd | Launceston | 2016 |
| Coombs Automotive Limited | Chesham | 2015 |
| Coombs Electra Ltd | Chesham | 2020 |
| Coombs Heritage Limited | Chesham | 2012 |
| Coombs of Guildford Limited | Chesham | 2011 |
| Coombs Performance Limited | Chesham | 2014 |
| Coombs Racing Limited | Chesham | 2007 |
| Coonan Construction Limited | Surrey | 2003 |
| Coop Trade Co Ltd | Beckenham | 2022 |
| Cooper Banks Mackenzie Limited | Towcester | 2008 |
| Cooper Barnes Metals Limited | Warrington | 1929 |
| Cooper Bessant Ltd | Crawley | 2012 |
| Cooper Bidco Limited | Warrington | 2015 |
| Cooper Consultants Limited | Penrith | 2024 |
| Cooper Cranes Limited | Wolverhampton | 2004 |
| Cooper Lloyd Davies Limited | Preston | 1999 |
| Cooper MGA Ltd | London | 2023 |
| Cooper Nanotechnologies AG Limited | Sutton, Surrey | 2024 |
| Cooper Parry Trustees Limited | Derby | 2008 |
| Cooper Tarry Ltd | Broadstairs | 2013 |
| Cooper Trustees Limited | Winchester | 2012 |
| Coopers Appliances Ltd | London | 2015 |
| Coopers Holdings Limited | Warrington | 1982 |
| Coopers Metals (Holdings) Limited | Warrington | 1953 |
| Coopers Tourmaster Travel (Scotland) Limited | Midlothian | 2006 |
| Coorie in the Corner Limited | Pitlochry | 2017 |
| Coors Brewers Limited | Burton Upon Trent | 2009 |
| Cootehill Food Group Limited | Derby | 2018 |
| Cootes Veterinary Clinic Limited | Bristol | 2006 |
| COP UK Limited | Oldham | 2000 |
| COP3 Ltd | Southampton | 2022 |
| Copac (Aylesbury) Limited | Aylesbury | 2008 |
| Copac Limited | Aylesbury | 2015 |
| Copal Casting Limited | Kettering | 2005 |
| Copdock Mill Limited | Ipswich | 1983 |
| Cope Community Ltd | Caersws | 2018 |
| Cope Global Ltd | London | 2025 |
| Cope Marketing Limited | Loughborough | 1996 |
| Copeland Automotive Limited | Wokingham | 2024 |
| Copeland Distillery Company (NI) Ltd | Donaghadee | 2018 |
| Copeland Homes Limited | Newcastle Upon Tyne | 2004 |
| Copeland Keyholding and Response Ltd | Wirral | 2018 |
| Copeland UK Limited | Goole | 2007 |
| Copelands (Beckenham) Limited | Bromley | 2008 |
| Coperion Manufactory Co., Ltd | London | 2022 |
| Copers Cope Garage Limited | Sevenoaks | 1956 |
| Copiers@Cost Limited | Northampton | 2015 |
| Coplastix Limited | Dudley | 2023 |
| Copley Consultancy Ltd | Bexley | 2024 |
| Copley,Marshall & Co.,Limited | Nottingham | 1899 |
| Coppa Club Limited | London | 2015 |
| Coppa Gutta Limited | Southampton | 2002 |