| Adare International Transport UK Ltd | Beckenham | 2021 |
| Adarniya Limited | London | 2016 |
| Adarsh Engineering Limited | Edgware | 2011 |
| Adart Global Ltd | Dartford | 2025 |
| Adas Consulting Ltd. | Warrington | 2016 |
| Adas House Ltd | Dunfermline | 2025 |
| Adash Care Limited | London | 2024 |
| Adassa’S Waxing Salon Ltd | Birmingham | 2016 |
| Adaston Holdings Ltd. | Harrogate | 2016 |
| Adaston Investments Limited | Harrogate | 2016 |
| Adaston Limited | Harrogate | 2016 |
| Adastra Adventures Limited | Monmouth | 2015 |
| Adastra Global Investments Limited | Enfield | 2008 |
| Adastra Place Management Company Limited | Shrewsbury | 2006 |
| Adastra Services Limited | Worcester | 2006 |
| Adastrum Consulting Ltd | Woldingham | 2009 |
| Adastrum Limited | Watlington | 2006 |
| Adaugeo Media Ltd | London | 2012 |
| Adaugeo Rain Ltd | Chester | 2021 |
| Adavirtual Business Support Limited | Crawley | 2020 |
| Adawy Secure Ltd | Gloucester | 2025 |
| ADB Accounting Solutions Ltd | Redcar | 2016 |
| ADB Alarms Northern Ltd | Stoke-On-Trent | 2017 |
| ADB Alarms Response Ltd | Stoke-On-Trent | 2017 |
| ADB Alarms Services Ltd | Stoke-On-Trent | 2017 |
| ADB Audio Visual Limited | Bingham | 1999 |
| ADB Cleaning Ltd | Glasgow | 2024 |
| ADB Engineering Services Limited | Preston | 2015 |
| ADB Exclusive Ltd | Glasgow | 2021 |
| ADB Exterior Cleaning Solutions Ltd | High Wycombe | 2016 |
| ADB Garden Care Ltd. | Newcastle - Under - Lyme | 2016 |
| ADB Properties Limited | Poole | 2010 |
| ADB Recruitment Solutions Ltd | Liverpool | 2022 |
| Adband Limited | Rotherham | 2012 |
| Adbe Ltd | Cirencester | 2012 |
| Adbell Holdings Limited | London | 2022 |
| Adbell International Limited | London | 2000 |
| Adbridge Limited | Leigh-On-Sea | 2025 |
| ADC Advisory Ltd | Newcastle Upon Tyne | 2025 |
| ADC AI Ltd | Aberdeen | 2021 |
| ADC Cleaning Limited | Newmarket | 2009 |
| ADC Environmental Services Limited | Sheffield | 2000 |
| ADC Fire and Security Ltd | Chorley | 2013 |
| ADC Fire Systems Limited | Cardiff | 2007 |
| ADC Global Enterprises Ltd | Coventry | 2018 |
| ADC Hire Limited | Birmingham | 2020 |
| ADC Lease Ltd | Worcester | 2025 |
| ADC Plant Hire Limited | Wallasey | 2016 |
| ADC Pressure Washing Ltd | New Malden | 2022 |
| ADC Properties Limited | Chesterfield | 2005 |
| ADC Recruitment Limited | Birmingham | 2025 |
| ADC Resourcing Ltd | Cambridge | 2026 |
| ADC Stars Ltd | Hampton | 2016 |
| Adcam UK Limited | Northampton | 1998 |
| Adcg (UK) Limited | London | 2008 |
| Adcl Holdings Ltd | Arbroath | 2023 |
| Adcl Properties Ltd | Arbroath | 2023 |
| Adco Design Ltd | London | 2021 |
| Adco Limited | Bath | 2012 |
| Adco London Ltd | London | 2015 |
| Adco N/W Limited | Oldham | 2009 |
| Adco Properties (Mansfield) Limited | Sutton-In-Ashfield | 2003 |
| Adco Secure Ltd | Sittingbourne | 2019 |
| Adco Trading Limited | London | 2022 |
| Adcock Agri Ltd | Benfleet | 2013 |
| Adcock Plant Ltd | Norwich | 2007 |
| Adcock Solutions Limited | Lichfield | 2019 |
| Adcom Advisory Limited | London | 2020 |
| Adcom Grant Limited | Birmingham | 2019 |
| Adcomp Groep Limited | Doncaster | 1992 |
| Adcopia Ltd | Berkhamsted | 2024 |
| Adcote Consulting Limited | Chester | 2017 |
| Adcroft Amusements Limited | Holywood | 2002 |
| Adcroft Hilton Limited | Blackpool | 2005 |
| Adcs Services Ltd | London | 2025 |
| ADD Cleaning Services Limited | Reigate | 2022 |
| ADD Enterprise International Ltd | London | 2020 |
| ADD Guard Security Ltd | Cheam | 2011 |
| ADD HR Ltd | Maidenhead | 2011 |
| ADD HR Solutions Limited | Beverley | 2012 |
| ADD IT UP Finance Limited | Biggleswade | 2003 |
| ADD Magic Bespoke Events Ltd | London | 2026 |
| ADD Manpower Ltd | London | 2018 |
| ADD Mindful Cleaning Ltd | London | 2026 |
| ADD Ningbo Ltd | Kenilworth | 2014 |
| ADD Process Solutions Ltd | Wigan | 2025 |
| ADD Property Talent Limited | Milton Keynes | 2025 |
| ADD Recruitment Ltd | Leigh | 2023 |
| ADD Some Zest Ltd | London | 2022 |
| ADD Talent Solutions Ltd | London | 2020 |
| ADD Zest Limited | Slough | 1997 |
| Adda Talent Solutions Ltd | Oxford | 2024 |
| Adda's Cleaning Co Ltd | Leeds | 2026 |
| Addacard Limited | Towcester | 2007 |
| Addage Limited | Birmingham | 2008 |
| Addai Ltd | Wellingborough | 2015 |
| Addanex International Limited | Chester | 2022 |
| Addcare International Ltd | Burgess Hill | 2017 |
| Addco London Limited | London | 2008 |
| Added Detail Limited | Salford | 2024 |