| A Clean Home Ltd | Gillingham | 2022 |
| A Clean LUM Ltd | Elgin | 2025 |
| A Clean Mind Ltd | Halesowen | 2025 |
| A Clean Services Limited | Newport | 2004 |
| A Clean Sweep Cleaning Services Limited | Torquay | 2024 |
| A Clean Sweep Cooperative Ltd | Fishponds | 1995 |
| A Clean Touch Ltd | Llanelli | 2020 |
| A Cleaner (London) Limited | London | 2014 |
| A Cleaner Company Limited | Basildon | 2011 |
| A Cleaner Experience Ltd | London | 2026 |
| A Cleaner Exterior Ltd | Trowbridge | 2022 |
| A Cleaner Generation Limited | St. Agnes | 2014 |
| A Cleaning Company Limited | Wealdstone | 2024 |
| A Cleaning High Wycombe Limited | High Wycombe | 2023 |
| A Cleanup UK Ltd | London | 2026 |
| A Complete Cleaning Service Limited | Arlesey | 2005 |
| A Constable Limited | Hadlow | 2007 |
| A Cooksey & Sons Ltd | Trowbridge | 2009 |
| A Corn Equipment Limited | Southampton | 2018 |
| A Couper Marketing Services Ltd | London | 2006 |
| A Coupland Labour Limited | Boston | 2012 |
| A Crew Apart Limited | Stafford | 2016 |
| A Cristal Clean Ltd | Rochford | 2012 |
| A Crofts Limited | Warrington | 2015 |
| A Crow Management Services Ltd | Houghton Le Spring | 2009 |
| A Crystal Clean Ltd | Reading | 2013 |
| A Cube Services Ltd | Southsea | 2025 |
| A Cube Utilities Ltd | London | 2017 |
| A Cuppla Tools Ltd | Wishaw | 2025 |
| A Curious Soul Limited | London | 2023 |
| A Curious Space Limited | Beckenham | 2019 |
| A CUT Above (Surrey) Limited | Addlestone | 2014 |
| A CUT Above Garden Maintenance Ltd | Glasgow | 2021 |
| A CUT Above Garden Maintenance Service Ltd | Wetherby | 2024 |
| A CUT Above Highland Ltd | Inverness | 2024 |
| A CUT Above Landscape & Treecare Limited | Northampton | 2017 |
| A CUT Above the Rest (Worthing) Limited | Worthing | 2021 |
| A D & C Farrell Limited | Wigan | 1997 |
| A D a Construction Services Ltd | Harwich | 2015 |
| A D Broadbent & Co Limited | Harrogate | 2002 |
| A D C (East Anglia) Limited | Wisbech | 2001 |
| A D C L Humphries & Sons Stonemasons Limited | Penarth | 2017 |
| A D Castings Limited | Blackburn | 2006 |
| A D Ceramics Ltd. | Northampton | 2016 |
| A D Colbert Limited | Longfield | 2013 |
| A D Consulting (LDN) Ltd | Harrow | 2010 |
| A D D Gardening Services Limited | Stockport | 2012 |
| A D D Information Services Limited | Edgware | 2001 |
| A D Designer Driveways Limited | Wymondham | 2020 |
| A D Hire Services Ltd | Norwich | 2018 |
| A D I Environmental Limited | Kings Norton Birmingham | 2005 |
| A D I Landscapes Ltd | Sudbury | 2018 |
| A D L General Services Ltd | Aldershot | 2017 |
| A D L Valeting Ltd | Horsham | 2023 |
| A D Morton (Holdings) Limited | Rossendale | 2007 |
| A D Payroll Solutions Ltd | Sheffield | 2024 |
| A D Plant Hire Limited | Middlesbrough | 2007 |
| A D Plant Ltd | West Horndon | 2012 |
| A D R Wealth Management Limited | Sevenoaks | 2006 |
| A D Ramage Limited | Chippenham | 2004 |
| A D Recruitment Limited | Darlington | 2014 |
| A D S Design & Brand Development Limited | Tewkesbury | 1999 |
| A D S Landscaping Ltd | Ellesmere Port | 2025 |
| A D S Music Production Limited | Sandbach | 2012 |
| A D Security Systems Limited | Ilford | 2017 |
| A D Site Welding Services Ltd | Leicestershire | 2010 |
| A D Staffing Solutions Ltd | Chelmsford | 2026 |
| A D Thresh Consulting Ltd | Bradford | 2014 |
| A D Willsher Machinery Limited | Sevenoaks | 2012 |
| A D&G Recruitment Ltd | London | 2020 |
| A Davies Carpentry & Joinery Ltd | Cobham | 2017 |
| A Day in the Country Limited | Banbury | 1990 |
| A Dean Financial Solution Ltd | London | 2016 |
| A Deeper Green Community Interest Company | Bristol | 2017 |
| A Deus Consultancy Limited | Aylesbury | 2015 |
| A Disappearing Number Limited | Woodford Green | 2015 |
| A Ditech Technical Solutions Ltd | Taunton | 2024 |
| A Dog's Life Ltd | Glasgow | 2024 |
| A Dogs Day OUT Ltd | Bridgwater | 2019 |
| A DOT Limited | London | 2011 |
| A Driving Coach Ltd | Derby | 2023 |
| A Duffield Marketing Limited | Leeds | 2025 |
| A Dunlop Cleaning Ltd | Glasgow | 2026 |
| A E (Worcester) Limited | Worcester | 2012 |
| A E Bray Limited | Milton Keynes | 2015 |
| A E D Locator (E.U.) Limited | Bristol | 2008 |
| A E Hire Ltd | Northampton | 2022 |
| A E Installations Limited | Kettering | 2020 |
| A E L Crystals Limited | Crawley | 1991 |
| A E L Systems Ltd | Newton Aycliffe | 2003 |
| A E Langford & Co Ltd | Basingstoke | 2010 |
| A E M G Holdings Limited | Redditch | 2019 |
| A E Services MK Limited | London | 2026 |
| A E Thomas & Co Limited | Stockport | 2023 |
| A E Yates (EOT) Limited | Bolton | 2021 |
| A Edge Tree & Garden Services Limited | Bury | 2020 |
| A Eldridge DM Limited | Brentford | 2018 |
| A Ellis Tree Surgery Limited | High Wycombe | 2016 |
| A Evans Care Limited | Market Drayton | 2019 |
| A Evans Ground Maintenance Limited | Nottingham | 2021 |