| Comfort Health Concierge Ltd | London | 2023 |
| Comfort Linen Ltd | Axminster | 2018 |
| Comfort Needs Limited | Ballymena | 2017 |
| Comfort Operative Ltd | Essex | 2017 |
| Comfort Thread Limited | Haywards Heath | 2026 |
| Comfortair Hire & Sales (UK) Limited | Greenford | 1999 |
| Comforter Outreach Ministry | London | 2020 |
| Comforts Health and Beauty Limited | London | 2025 |
| Comfy Chaos Limited | Datchet | 2025 |
| Comfy Services Ltd | Ruislip | 2022 |
| Comfyironing & Alterations Ltd | Brandon | 2024 |
| Comgain Ltd | London | 2022 |
| Comic Book UK CIC | Leigh-On-Sea | 2024 |
| Coming Home to Your Truth CIC | Aylesford | 2025 |
| Coming UP Roses Ltd | Leigh-On-Sea | 2024 |
| Comite International Radio Maritime - (Cirm) | London | 1990 |
| Comitis LII Limited | Blackmore | 2009 |
| Comm 1 Ltd | Leicester | 2023 |
| Comm Space Limited | Leigh-On-Sea | 2012 |
| Comma Consulting UK Limited | Staines-Upon-Thames | 2009 |
| Command Prayer Centre Ministries International | Manchester | 2003 |
| Commando 2024 Limited | Fort William | 2024 |
| Commando Crew Ltd | London | 2015 |
| Commando Fitness (UK) Limited | Hailsham | 2013 |
| Commbag PVT Ltd | Ruislip, | 2024 |
| Commco Print Solutions Limited | Tyne And Wear | 2001 |
| Commemorative Funeral Notice Ltd | Glasgow | 2017 |
| Commerce Brokers Limited | London | 2019 |
| Commerce Chamber District of Frome Limited | Frome | 1997 |
| Commerce Road Business Park Management Company Limited | London | 2004 |
| Commercial & Domestic Appliance Service Limited | Cradley Heath | 2013 |
| Commercial & Domestic Appliances Ltd | Hounslow | 2013 |
| Commercial & Residential Maintenance Limited | Manchester | 2013 |
| Commercial & Residential Mechanical Services Ltd | Lee-On-The-Solent | 2019 |
| Commercial 2020 Ltd | Newport | 2018 |
| Commercial Artists Limited | London | 2023 |
| Commercial Broadcasters Association | London | 2004 |
| Commercial Catering Equipment Services Ltd | Stockport | 2014 |
| Commercial Catering Solutions Ltd | Belfast | 2019 |
| Commercial Energy Broker Ltd | Bury St. Edmunds | 2023 |
| Commercial Energy Claims Limited | Portsmouth | 2023 |
| Commercial Enforcements (UK) Limited | London | 2014 |
| Commercial EPC Ltd | Romford | 2019 |
| Commercial Fuel Development Limited | Hereford | 2017 |
| Commercial GAS & Electricity Limited | Ilford | 2013 |
| Commercial Grounds Care Services Limited | Godalming | 2002 |
| Commercial Hagola Ltd | Canvey Island, Essex | 2025 |
| Commercial Heating & Drying Limited | Doncaster | 2020 |
| Commercial Insurance Consultants Ltd | Colchester | 2019 |
| Commercial Kurd Barbers Ltd | Newport | 2025 |
| Commercial Laundry Sales & Maintenance Limited | Telford | 2002 |
| Commercial Leisure Supplies Limited | Aylesford | 2007 |
| Commercial Management Solutions Ltd | Warrington | 2019 |
| Commercial Marquee Hire Ltd | Llanelli | 2009 |
| Commercial Networks Limited | Newcastle Under Lyme | 2011 |
| Commercial Property Brokers Limited | Leeds | 2013 |
| Commercial Real Estate Finance Council Europe (CRE Finance Council-Europe) | Canary Wharf | 2004 |
| Commercial Real Estate Women UK | Steyning | 2024 |
| Commercial Rent Bailiffs Limited | Cardiff | 2012 |
| Commercial Services & Property Limited | Canvey Island | 2024 |
| Commercial Square Bonfire Limited | Lewes | 2014 |
| Commercial Tenants Association UK Limited | London | 2023 |
| Commercial Test and Purge Ltd | Thetford | 2015 |
| Commercial Trade Services (Facilities Management) Ltd | London | 2016 |
| Commercial Trade Services (Group) Limited | London | 2004 |
| Commercial Tree Surgery & Site Clearance Ltd | Harrow | 2026 |
| Commercial Valeting Services (SW) Ltd | Newport | 2009 |
| Commercial Valeting SW Ltd | Folkestone | 1999 |
| Commercial Vehicle Cleaners Limited | Darlington | 2004 |
| Commfy Kira Ltd | London | 2025 |
| Commission Apostolic Trust Ltd | Bournemouth | 2012 |
| Commissioned Generation CIC | Bidwell West | 2025 |
| Commit to BE Fit Ltd | Blackburn | 2010 |
| Committee on the Administration of Justice Ltd-The | Belfast | 1997 |
| Commodities Direct Limited | Eastbourne | 2018 |
| Commodity Consulting Ltd | Colchester | 2026 |
| Common Barber BL1 Ltd | Bolton | 2019 |
| Common Barbers Greyhound Limited | London | 2022 |
| Common Barbers Ltd | London | 2019 |
| Common Belonging UK | Kingston Upon Thames | 2026 |
| Common Consultancy Limited | King'S Lynn | 2019 |
| Common Farm Activities Ltd | Leigh | 2026 |
| Common Ground Cornwall CIC | Bude | 2026 |
| Common Ground Sports Limited | London | 2017 |
| Common Interests Beauty Ltd | Birmingham | 2023 |
| Common Law Association of Notaries | Hassett Street | 2010 |
| Common Purpose Training Ltd | London | 2016 |
| Common Room Projects Limited | Harlow | 2019 |
| Common Sense Britain Ltd | Oldbury | 2025 |
| Common Sense Energy Limited | Sawbridgeworth | 2014 |
| Common Thirds Ltd | Folkestone | 2025 |
| Common Unity Development Ltd. | London | 2011 |
| Commoner Services Ltd | Liverpool | 2024 |
| Commonhold NOW Ltd | London | 2023 |
| Commonwealth Alliance Ltd | London | 2021 |
| Commonwealth Association of Surveying and Land Economy | Keynsham | 2023 |
| Commonwealth Climate and Law Initiative | London | 2019 |
| Commonwealth Council for Education | London | 2024 |
| Commonwealth Engineers' Council | London | 2024 |
| Commonwealth Equality Network Limited | London | 2014 |