| ADS2 Limited | Thirsk | 2010 |
| Adsa Residential Limited | Reading | 2006 |
| Adsamoj Careers Services Ltd | Preston | 2022 |
| Adsan Carr Ltd | London | 2017 |
| Adsan Limited | Edgware | 2005 |
| Adsaro Consulting Limited | Wilmslow | 2023 |
| Adsay Limited | Newport | 2025 |
| Adscape Gardening Ltd | Felixstowe | 2012 |
| Adscapes Limited | Worthing | 2016 |
| Adscreen Support Services Ltd | Norwich | 2023 |
| Adsd Services Ltd | Sheffield | 2020 |
| Adsec Group Limited | London | 1998 |
| Adsec Ltd | Accrington | 2021 |
| Adserv Ltd | Edinburgh | 2026 |
| Adservio Consulting Ltd | Bessborough Road, Harrow | 2006 |
| Adshead Properties Ltd | Colwyn Bay | 2023 |
| Adsiduus Limited | London | 2003 |
| Adsign Advertising Limited | Farnham | 1993 |
| Adsila Limited | Edgware | 2012 |
| Adslytic Limited | Cardiff | 2019 |
| Adso Consultancy Ltd | Dagenham | 2018 |
| Adsoft Limited | Leicester | 2023 |
| Adsona Cleaning Services Ltd | London | 2024 |
| Adsr Technologies Limited | Warrington | 2011 |
| Adsroha Ltd | London | 2025 |
| Adss Transport Ltd | Hayes | 2017 |
| Adstar Properties Limited | Woodford Green | 1970 |
| Adstats Innovations Limited | London | 2016 |
| Adsteak Ltd | London | 2023 |
| Adstral Limited | Swindon | 2010 |
| Adstrum Consulting Ltd | London | 2013 |
| Adstrum Ltd | London | 2023 |
| Adsuk Ltd | Blackpool | 2016 |
| Adsun Group Ltd | Cardiff | 2016 |
| Adsw (Investments) Limited | London | 1999 |
| Adsw Investment Holdings Limited | London | 2004 |
| Adswizz Limited | London | 2018 |
| ADT Cleaning Services Ltd | Sidcup | 2026 |
| ADT Eyecare Ltd | Rochdale | 2022 |
| ADT Support Ltd | Reading | 2019 |
| ADT Ventures Limited | London | 2008 |
| Adtalent Limited | Dunstable | 2018 |
| Adtapt Limited | Lytham St. Annes | 2006 |
| Adtech Total Security Ltd. | Erith | 2018 |
| Adthority Ltd | Exeter | 2014 |
| Adtierra Ltd | London | 2025 |
| Adtim Limited | London | 2003 |
| Adto Specialist Cleaning Services Ltd | Burnham | 2025 |
| Adua Residential Services Limited | London | 2025 |
| Aduaye Limited | Peterborough | 2025 |
| Adullam Social Enterprises C.I.C. | West Bromwich | 2016 |
| Adult Pleasure Zone Ltd | West Midlands, Kingswinford | 2017 |
| Adult Training Network Limited | Southall | 2001 |
| Adultcareservices Limited | Southampton | 2007 |
| Aduma Recruitment Ltd | London | 2025 |
| Aduna Capital Solutions Ltd | London | 2018 |
| Adur Pest Control Limited | Worthing | 2023 |
| Adurisoft Limited | Sale | 2016 |
| Adusei Ltd | London | 2025 |
| Aduspenny Contract Services Ltd | Waltham Cross | 2015 |
| Aduwaye Limited | Walsall | 2024 |
| ADV Bike Tours Ltd | Barnard Castle | 2021 |
| ADV Enterprise Ltd | London | 2017 |
| ADV Leisure Ltd | Saffron Walden | 2018 |
| ADV Marine and Shore Service Ltd | Stockport | 2007 |
| ADV Recruitment Ltd | London | 2022 |
| ADV Security Limited | Manchester | 2014 |
| ADV Services South East Limited | Ashford | 2025 |
| ADV Solutions Ltd | London | 2019 |
| ADV Talent Partners Ltd | London | 2017 |
| ADV Technical Services Limited | Huddersfield | 2012 |
| ADV UK Family Office Ltd | London | 2020 |
| ADV4NCE Childcare Ltd | Newcastle U Lyme | 2017 |
| Advance (Yorkshire) Limited | Doncaster | 2000 |
| Advance 2 Go Group CIC | Leeds | 2026 |
| Advance Abseiling Ltd | Waltham Cross | 2020 |
| Advance Auto Recovery Ltd | Ilkeston | 2020 |
| Advance Bar Security Ltd | Harlow, Essex | 2020 |
| Advance Biotech Ltd | Norwich | 2017 |
| Advance BPO Connects Ltd | Ellesmere Port | 2025 |
| Advance Business Consultancy Limited | Darlington | 2015 |
| Advance Business Ltd | Bangor | 2023 |
| Advance Car Sales Ltd | London | 2020 |
| Advance Care Limited | London | 2003 |
| Advance Chartering Limited | London | 2010 |
| Advance Cleaners Limited | Birkenhead | 1997 |
| Advance Cleaning (London) Ltd | Tadworth | 2025 |
| Advance Cleaning and Maintenance Services Ltd | Wembley | 2023 |
| Advance Cleaning Applications Limited | Newcastle Upon Tyne | 2002 |
| Advance Cleaning Management T/A CCS Services Limited | Barry | 2013 |
| Advance Cleaning Services Brighton Ltd | Dartford | 2025 |
| Advance Cleaning Services Limited | Leigh-On-Sea | 2001 |
| Advance Cleaning Solutions Limited | Glasgow | 2016 |
| Advance Construction Group Limited | Bellshill | 1999 |
| Advance Consulting (GB) Limited | Biddenden | 2006 |
| Advance Contracting Solutions Limited | Ewloe | 2010 |
| Advance Creatives Limited | Manchester | 2025 |
| Advance Digital Graphics Limited | Ipswich | 1980 |
| Advance Drain Services Limited | Maidston | 2020 |
| Advance Drivers Limited | Birmingham | 2009 |