| Clayton Nails Ltd | Liverpool | 2025 |
| Clayton Partners Ltd | Chichester | 2012 |
| Clayton Perks Consulting Limited | Gateshead | 2012 |
| Clayton Skincare Limited | Bradford | 2021 |
| Clayton Stirling Limited | Gravesend | 2019 |
| Clayton Tech Repairs Ltd | Bradford | 2024 |
| Clayton Trimz Ltd | Bradford | 2023 |
| Clayton Village Barbers Ltd | Manchester | 2024 |
| Clayton Wigan Estates Limited | Salford | 2024 |
| Claytons Barbershop Ltd | Castleford | 2023 |
| CLB Inspection Ltd | Jedburgh | 2025 |
| CLB Performance Ltd | Nottingham | 2014 |
| CLB Semi-Permanent Makeup Limited | Chesterfield | 2017 |
| Clb-Aesthetic Ltd | Godalming | 2026 |
| Clbsocials Ltd | Manchester | 2025 |
| CLC (Aylesbury) Ltd | London | 2024 |
| CLC Church Limited | Croydon | 2019 |
| CLC Health & Aesthetics Limited | Stockton-On-Tees | 2022 |
| CLC Monitor Limited | London | 2018 |
| CLC Nails Limited | Glasgow | 2024 |
| CLC Plumbing & Heating Limited | Watford | 2014 |
| CLC Samaritans Limited | Mitcham | 2025 |
| CLC Training Services Ltd | Blackwood | 2026 |
| CLC Wind Limited | Hull | 2020 |
| CLC1 (UK) Limited | Stockport | 2025 |
| Clck Creations Ltd | Lanark | 2025 |
| CLD Barbershop Ltd | Southampton | 2026 |
| CLD Enterprise Ltd | Walsall | 2019 |
| CLD Hair Co. Ltd | London | 2024 |
| Cleage Clinic (Yorkshire) Ltd | Bradford | 2025 |
| Cleage Clinic Ltd | London | 2021 |
| Clean Fresh Limited | Basingstoke | 2017 |
| Clean "N" Press Ltd | Londonderry | 2007 |
| Clean & Crisp Drycleaners Limited | London | 2023 |
| Clean & DRY Limited | Hadlow | 2015 |
| Clean & DRY Services Limited | Norwich | 2003 |
| Clean & Natural Ltd | Leicester | 2014 |
| Clean - Scene Services Limited | Wolverhampton | 1997 |
| Clean 4 ME (Elgin) Ltd | Elgin | 2021 |
| Clean Air Association | London | 2020 |
| Clean Air Fund | London | 2019 |
| Clean Air Miles Limited | London | 2018 |
| Clean and Fresh Platt Lane Ltd | Manchester | 2025 |
| Clean and Gleam MK Limited | Northampton | 2015 |
| Clean and Green Communities CIC | Lymm | 2025 |
| Clean and Pest Solutions Ltd | Liverpool | 2018 |
| Clean and Press Limited | Wimborne | 2017 |
| Clean AS a Whistle (London & Herts) Ltd | Billingshurst | 2006 |
| Clean Bean Limited | London | 2008 |
| Clean Break Consultants Ltd | Leeds | 2025 |
| Clean Brite Spaces Limited | Bishop'S Stortford | 2017 |
| Clean Bubbles Limited | Park Birmingham | 2015 |
| Clean Car Centres Limited | Canvey Island | 1992 |
| Clean Car Wash Ltd | Wapping | 2019 |
| Clean Care by Sharpeye Ltd | Northampton | 2014 |
| Clean Care Club Ltd | London | 2024 |
| Clean Clean Limited | Birmingham | 2005 |
| Clean Clothes International Ltd | London | 2025 |
| Clean Clothes Limited | Windsor | 2017 |
| Clean Clubb Ltd | Harrow | 2023 |
| Clean Consultants Limited | Dunmow | 2014 |
| Clean Contractors Ltd | Romsey | 2010 |
| Clean Core Group Ltd | London | 2025 |
| Clean Corner Maintenance and Lettings Ltd | Eastbourne | 2021 |
| Clean Cuffs Ltd | Acton | 2022 |
| Clean CUT Barbers 1 Ltd | Folkestone | 2024 |
| Clean CUT Barbers 2 Ltd | Folkestone | 2024 |
| Clean CUT Barbers Inc Limited | Wolverhampton | 2026 |
| Clean CUT Barbers Limited | Folkestone | 2017 |
| Clean CUT Barbers MCR Ltd | Manchester | 2026 |
| Clean CUT Barbershop 28 Ltd | Nottingham | 2026 |
| Clean Dash Express Ltd | Stanford-Le-Hope | 2025 |
| Clean Daze Ltd | Stoke-On-Trent | 2026 |
| Clean Dispatch Limited | Bolton | 2019 |
| Clean DRY Cleaners & Launders Limited | Slough | 2018 |
| Clean Drycleaners Ltd | Sutton | 2025 |
| Clean Eagles Ltd | Enfield | 2017 |
| Clean Energy Group Ltd | Northampton, | 2019 |
| Clean Energy Planet Ltd | Harrow | 2021 |
| Clean Energy Systems Limited | Harrow | 2010 |
| Clean Express Linen Ltd | London | 2015 |
| Clean Finish Services Ltd | London | 2025 |
| Clean Flamingos (Commercial Launderette) Ltd | Bristol | 2023 |
| Clean Genie Manchester Limited | Manchester | 2014 |
| Clean Girl Aesthetics Limited | Edinburgh | 2023 |
| Clean Green Valeting Ltd | London | 2015 |
| Clean Hands Cleaners Ltd | Birmingham | 2018 |
| Clean Home London Ltd | Hounslow | 2017 |
| Clean Image (UK) Laundry & Drycleaning Services Limited | Walsall | 2011 |
| Clean Image (West Yorkshire) Ltd | Doncaster | 2017 |
| Clean Inc Cheshire Ltd | Stockport | 2020 |
| Clean Inc Contracts Limited | Stockport | 2021 |
| Clean Inc Heaton Moor Ltd | Stockport | 2020 |
| Clean IT ALL (Northern) Limited | Southport | 2001 |
| Clean Kutz Barber Limited | London | 2024 |
| Clean Laundry & Drycleaners Limited | Greenford | 2013 |
| Clean Line Laundry Limited | Broadstairs | 2014 |
| Clean Linen Co. Limited | West Yorkshire | 2024 |
| Clean Linen Services Limited | Camberley | 1906 |
| Clean Living Cleaning Service Limited | Tilbury | 2025 |