| Adena Fire Safety Services Limited | South Woodham Ferrers | 2011 |
| Adena Services Ltd | London | 2020 |
| Adencast Limited | Hemel Hempstead | 2023 |
| Adenexglobal Limited | Haverhill | 2025 |
| Adenike Care Limited | Blackpool | 2017 |
| Adeniyi Okubanjo Limited | Ely | 2019 |
| Adenmore Limited | London | 2020 |
| Adenside Limited | Liverpool | 2009 |
| Adentea Limited | Chatham | 2009 |
| Adentro Limited | Epsom | 2016 |
| Adeo Property Development [Overstrand] Limited | Southwater | 2012 |
| Adeo Property Developments (Compton's Lane) Ltd | Horsham | 2016 |
| Adeo Property Management Limited | Horsham | 2009 |
| Adeo Travel Ltd. | Cardiff | 2012 |
| Adeok Limited | Leeds | 2019 |
| Adeolu Consults Limited | Oxford | 2023 |
| Adeprom-Gb Global Services Ltd | Motherwell | 2026 |
| Adept Security Services Limited | Dartford | 2023 |
| Adept Agency Ltd | Pontefract | 2018 |
| Adept ALL in One Ltd | Oldham | 2019 |
| Adept Asset Solutions Ltd | Olney | 2015 |
| Adept Business Consultancy Limited | Stafford | 1992 |
| Adept Central Limited | Lichfield | 2017 |
| Adept Cleaning & Maintenance Services Ltd | Rotherham | 2000 |
| Adept Cleaning Services Limited | Tamworth | 1995 |
| Adept Consultants Ltd | Mitcham | 2024 |
| Adept Corporate Services Limited | Manchester | 2017 |
| Adept Corporate Services Two Limited | Manchester | 2017 |
| Adept Demand Limited | Norwich | 2022 |
| Adept Digital Collective Ltd | London | 2024 |
| Adept Employment Ltd | Swansea | 2020 |
| Adept Facilities Group Ltd | Swansea | 2015 |
| Adept Fire & Security Limited | Bristol | 2011 |
| Adept Global Solutions Limited | London | 2022 |
| Adept Group Business Services Centre Ltd | London | 2025 |
| Adept Health and Social Care Ltd | Leicester | 2023 |
| Adept Healthcare Limited | Fareham | 2013 |
| Adept HR Ltd | Shipley | 2021 |
| Adept Lift Technical Services EOT Limited | Dartford | 2024 |
| Adept London Services Limited | Croydon | 2021 |
| Adept Paraplanning Ltd | Kidderminster | 2024 |
| Adept Partners Group Limited | Chippenham | 2020 |
| Adept PHB Limited | Droitwich | 2006 |
| Adept Recovery Limited | Cardiff | 2010 |
| Adept Recruitment Limited | Lewisham | 1992 |
| Adept Resourcing Engineering Ltd | Cleckheaton | 2016 |
| Adept Restorative Cleaning Limited | Westerham | 2010 |
| Adept Services Limited | Darlington | 2007 |
| Adept Solutions Recruitment Limited | Bournemouth | 2019 |
| Adept Sourcing Ltd. | London | 2016 |
| Adept Systems (UK) Limited | Barry | 2014 |
| Adept Transcription Limited | Milton Keynes | 2003 |
| Adept Unlimited Ltd | Liverpool | 2023 |
| Adepta Engineering Limited | Barry | 2000 |
| Adeptio Consulting Limited | Altrincham | 2011 |
| Adeptio Solutions Limited | Whitley Bay | 2013 |
| Adeptis Group Partnership Ltd | Brighton | 2016 |
| Adepto Consulting Limited | Milton Keynes | 2013 |
| Adepto Technical Recruitment Limited | Sale | 2015 |
| Adeptro Window Cleaning Ltd | Keighley | 2006 |
| Adeptus Talent Limited | Bristol | 2024 |
| Aderelph Ltd | London | 2016 |
| Aderome Limited | Kirkliston | 2025 |
| Ades NDT Limited | Aberdeen | 2014 |
| Adesatos Limited | | 2007 |
| Adeshi Ground Limited | Watford | 2026 |
| Adesigner Limited | Horsham | 2016 |
| Adesina Holdings and Investments Ltd | Gravesend | 2025 |
| Adesso Compliance Limited | Walsall | 2012 |
| Adesso Global Ltd | Chessington | 2013 |
| Adeste Advisory Limited | Purley | 2019 |
| Adesuwa Place Limited | Middleton | 2021 |
| Adet Facilities Ltd | Enfield | 2025 |
| Adetiq Limited | Portslade | 1986 |
| Adetom Limited | Cardiff | 2025 |
| Adevent (Midlands) Limited | Alfreton | 2011 |
| Adewog Services Ltd | Gillingham | 2020 |
| Adex Healthcare Plus Ltd | Croydon | 2015 |
| Adex Medical Staffing Ltd | Manchester | 2023 |
| Adex Services Limited | Alfreton | 2001 |
| Adexchange Ltd | London | 2019 |
| Adexone Limited | London | 2019 |
| Adey M Ltd | Durham City | 2013 |
| ADF Recruitment Ltd | Berkhamsted | 2024 |
| ADF Scale (Holdings) Limited | Cannock | 2019 |
| Adfabs Automated Gates Limited | Bradford | 2019 |
| Adfenwal Ltd | Croydon | 2023 |
| Adfit Marketing Ltd | Ilford | 2022 |
| Adflair Funnels Ltd | Manchester | 2025 |
| Adfloor Ltd | London | 2024 |
| Adfm Inspire Limited | Wolverhampton | 2025 |
| Adfolio Limited | London | 2014 |
| ADG (Telford) Limited | Telford | 2009 |
| ADG Energy Services Ltd | Laurencekirk | 2004 |
| ADG Films Limited | | 2005 |
| ADG Gardens Limited | Pershore | 2022 |
| ADG Media Limited | Sheffield | 2015 |
| ADG Prefcap GP Limited | London | 2020 |
| ADG Prefcap II GP Limited | London | 2024 |
| ADG Procurement Limited | Oswestry | 2014 |