| Clean Curls Ltd | London | 2023 |
| Clean CUT Experts Ltd | Manchester | 2026 |
| Clean CUT Gardening Eastbourne Limited | Peacehaven | 2018 |
| Clean CUT Gardening Peacehaven Limited | Peacehaven | 2019 |
| Clean CUT Gardening Uckfield Limited | Peacehaven | 2019 |
| Clean CUT Home Solutions Ltd | Manchester | 2026 |
| Clean Energy Law Limited | Glasgow | 2024 |
| Clean Energy Network Ltd | London | 2020 |
| Clean Energy Technologies Norway Limited | London | 2017 |
| Clean GEN Consulting Limited | Newbury | 2012 |
| Clean Image Investments Limited | Camberley | 1997 |
| Clean Service Drammen Ltd. | London | 2014 |
| Clean Slate Copy School Ltd | Bognor Regis | 2023 |
| Clean Slate Enterprises Ltd | Bognor Regis | 2021 |
| Clean Slate Team Ltd | Manchester | 2026 |
| Clean Sparkling Solution Ltd | Southsea | 2024 |
| Clean Sweep Hire Limited | Banbury | 2023 |
| Clean With E'S Services Ltd | Ashton | 2025 |
| CLEAN4SHAW Ltd | Northampton | 2023 |
| Cleanair Systems Limited | Bridlington | 2008 |
| Cleanbake Coating Solutions Limited | Preston | 2013 |
| Cleancarcompany Limited | London | 2020 |
| Cleancut (Kirton Holme) Limited | Boston | 2006 |
| Cleaner Air Solutions Limited | Sunderland | 2025 |
| Cleaner Fuels Limited | London | 2016 |
| Cleanerswarehouse Limited | Leyland | 2000 |
| Cleaning Assurance Ltd | Hertford | 2011 |
| Cleaning Business Growth Academy Ltd | Dunstable | 2024 |
| Cleaning England Ltd. | London | 2010 |
| Cleaning Equipment Supplies Limited | Southampton | 1997 |
| Cleaning IS OUR Business Ltd | Holmfirth | 2013 |
| Cleaning Solutions Services Ltd | Egham | 2018 |
| Cleaning Stations Limited | Leicester | 2023 |
| Cleaningironingcarecom Limited | Leatherhead | 2016 |
| Cleanleads Limited | Ross-On-Wye | 2012 |
| Cleanly Limited | Pontefract | 2018 |
| Cleanright Limited | Worthing | 2012 |
| Cleanright UK Cleaning Services Ltd | Bury St. Edmunds | 2018 |
| Cleanroom Projects Group Limited | Romsey | 2025 |
| Cleanroom Projects Holdings Limited | Haslingden | 2017 |
| Cleanroom Zone Ltd | Lincoln | 2026 |
| Cleanroomshop.Com Limited | London | 2022 |
| Cleanseat UK Limited | Brecon | 2021 |
| Cleansense Ltd | Bristol | 2025 |
| Cleansing Service (Southern Counties) Limited | Fareham | 1950 |
| Cleansing Service Group (Rushton) Limited | Fareham | 1985 |
| Cleansing Service Group (Tank Cleaning) Limited | Fareham | 1972 |
| Cleanstart Limited | Guildford | 2009 |
| Cleanstore Limited | Horsham | 2005 |
| Cleansure Solutions Ltd | Cardiff | 2026 |
| Cleanwell Commercial Limited | Strensall | 1986 |
| Clear Accountancy & Tax Limited | Telford | 2025 |
| Clear Accountancy Services Holdings Limited | Telford | 2015 |
| Clear Aesthetics Ltd | Croydon | 2022 |
| Clear Amber Manufacturing Ltd | Milnathort | 2021 |
| Clear and Bright Consultancy Limited | Nottingham | 2012 |
| Clear AS Day Optics Ltd | Wakefield | 2025 |
| Clear Car Valeting Ltd | Manchester | 2021 |
| Clear Choice Glazing Ltd | Mitcham | 2022 |
| Clear Dental Care (Lurgan) Limited | Belfast | 2013 |
| Clear Digital Limited | Manchester | 1998 |
| Clear Dynamic Care Ltd | Manchester | 2026 |
| Clear Dynamic Home Services Ltd | Manchester | 2026 |
| Clear Elite Network Ltd | Manchester | 2026 |
| Clear Elite Network Pros Ltd | Manchester | 2026 |
| Clear Farms Limited | Royston | 1982 |
| Clear Index Ltd | Manchester | 2022 |
| Clear Insights Consulting Limited | Birmingham | 2012 |
| Clear Landmark | Belfast | 2013 |
| Clear Leisure 2017 Limited | London | 2017 |
| Clear London Markets Limited | London | 2024 |
| Clear Mind Counselling Limited | Bordon | 2021 |
| Clear Path Accountancy Ltd | Leicester | 2020 |
| Clear Path Advisors Ltd | Manchester | 2026 |
| Clear Path Business Advisors Ltd | Manchester | 2026 |
| Clear Pharma Limited | Belfast | 2012 |
| Clear Property Solutions NW Limited | Stockport | 2021 |
| Clear Property South Limited | Belfast | 2013 |
| Clear River Property Limited | Clifton | 2012 |
| Clear Road Ltd | Maidstone | 2003 |
| Clear Signs Limited | Stalbridge | 2021 |
| Clear Swift Service Group Ltd | Manchester | 2026 |
| Clear Telecom Limited | Leigh-On-Sea | 2007 |
| Clear Thinking Limited | East Sussex | 1988 |
| Clear Value | Belfast | 2000 |
| Clear View PPE Limited | London | 2014 |
| Clear Vision Planning Ltd | Birmingham | 2024 |
| Clear Vision Realty Pros Ltd | Manchester | 2026 |
| Clear Vision Team Ltd | Manchester | 2026 |
| Clear Waste Properties Limited | Holmfirth | 2022 |
| Clear WAX Away UK Ltd | Sandbach | 2024 |
| Clear Wisdom Limited | Faversham | 2017 |
| Clearair Limited | Bridlington | 2007 |
| Clearbox Limited | Salford | 1904 |
| Clearclass Limited | London | 2018 |
| Clearfactor Limited | Glasgow | 2026 |
| Clearflight Limited | Manchester | 2006 |
| Clearflow Heat Recovery Ltd | Kingsbridge | 2025 |
| Clearhaven Group Ltd | Doncaster | 2026 |
| Clearing Business Payments Ltd | Derby | 2024 |