| AD Outdoor Ltd | Y Drenewydd | 2026 |
| AD Overseas (Europe) Limited | London | 1988 |
| AD Overseas Limited | London | 1954 |
| AD Pack Media Ltd | Romsey | 2019 |
| AD Payment Services Limited | London | 2026 |
| AD Pharma Consulting Limited | Henley On Thames | 2010 |
| AD Pharmaesthetics Ltd | Rugby | 2022 |
| AD Photo LAB Ltd | Ilford | 2016 |
| AD Photo Studio Ltd | Westcliff-On-Sea | 2011 |
| AD Photography Ltd | London | 2021 |
| AD Photography Studio Ltd | Hounslow | 2017 |
| AD Planning and Design Ltd | Crawley | 2014 |
| AD Plus Accountants Ltd | Glasgow | 2018 |
| AD Plus Property Co. Ltd. | Glasgow | 2012 |
| AD Pontem Advisory Ltd | Beaconsfield | 2026 |
| AD Poole Enterpises Ltd | London | 2024 |
| AD Power Consultancy Services Ltd | York | 2025 |
| AD Precision Design Limited | Birmingham | 2014 |
| AD Primary Care Consulting Ltd | London | 2025 |
| AD Pro Consultancy Ltd | London | 2025 |
| AD Professional Services Ltd | London | 2021 |
| AD Project Managament and Consulting Ltd | Chorley | 2025 |
| AD Projects Ltd | Diss | 2022 |
| AD Property Strategy Consulting Limited | Hornchurch | 2015 |
| AD Real Estate Consulting Limited | London | 2022 |
| AD Redos Limited | Nottingham | 2019 |
| AD Reflect Ltd | Manchester | 2014 |
| AD REM Legal Consultancy Ltd | London | 2015 |
| AD REM Limited | Lancashire | 2006 |
| AD Rock Consulting Limited | Aberdeen | 2015 |
| AD Russia (Holdings) Limited | London | 1999 |
| AD S GA Ltd | South Croydon | 2005 |
| AD Sabnis Consulting Limited | London | 2022 |
| AD Saddlery Services Ltd | Waterlooville | 2024 |
| AD Safety Consultants Ltd | Salisbury | 2019 |
| AD Savvy Ltd | Derby | 2024 |
| AD Science Limited | Stevenage | 2020 |
| AD Scope Limited | Brentwood | 2024 |
| AD Seventy One Ltd | Bury St. Edmunds | 2023 |
| AD Social Bloom Ltd | Beckenham | 2025 |
| AD Social Ltd | London | 2024 |
| AD Solicitors Limited | Barbican | 2024 |
| AD Solutions Doncaster Ltd | Doncaster | 2021 |
| AD Sparx Limited | Hereford | 2024 |
| AD Spectra Works Limited | Cardiff | 2025 |
| AD Spectrum Limited | Basingstoke | 2023 |
| AD Streva Limited | London | 2025 |
| AD Structures Limited | Sleaford | 2026 |
| AD Studios Ltd | London | 2025 |
| AD Success Limited | Watford | 2023 |
| AD Sustainability Consultancy Ltd | Larne | 2013 |
| AD System Solutions Ltd | Ilchester | 2022 |
| AD Tech Unicorn PR Limited | Epsom | 2017 |
| AD Technical Design Limited | Wigan | 2020 |
| AD Technologies Limited | Reading | 2006 |
| AD Test Media Limited | London | 2024 |
| AD Thalia Limited | Huntingdon | 2014 |
| AD Traders Ltd | Ilford | 2019 |
| AD Treasure Ltd. | London | 2013 |
| AD Two Plus Two Limited | Glasgow | 2018 |
| AD Valorem Accountancy Services Limited | Milton Keynes | 2001 |
| AD Valorem Audit Services Limited | Milton Keynes | 2009 |
| AD Valorem Consulting (UK) Limited | Dorchester | 2005 |
| AD Valorem Group Limited | Milton Keynes | 2019 |
| AD Valorem Media Ltd | London | 2021 |
| AD Valorem North Ltd | Barrow In Furness | 2021 |
| AD Valorem Northern Limited | Barrow In Furness | 2013 |
| AD Valorem Research and Development Limited | Milton Keynes | 2018 |
| AD Vault Ltd | Llantrisant | 2020 |
| AD Venturist Ltd | London | 2024 |
| AD Visor Ventures Ltd | Harrow | 2006 |
| AD Vitam Vini Ltd | West Horsley | 2025 |
| AD Warrior Ltd | Spalding | 2018 |
| AD Waste Management and Training Ltd | West Yorkshire | 2006 |
| AD Williams Consulting Ltd | Neath | 2024 |
| AD Wise Media Limited | Chorley | 2023 |
| Ad&Co Consultants Limited | Chatham | 2024 |
| Ad&Co Media Ltd | Kilmarnock | 2019 |
| Ad&S Ltd. | Cheltenham | 2017 |
| Ad-Agencylondon Ltd | London | 2011 |
| Ad-Int Limited | Worthing | 2019 |
| Ad-Loc Engineering Ltd | Dundee | 2015 |
| Ad-Mar Solutions Ltd | London | 2025 |
| Ad-Ology Ltd | Ludlow | 2025 |
| Ad-Options Limited | Leyland | 1996 |
| Ad-Rem Design Ltd | London | 2024 |
| Ad-Ride Ltd | London | 2025 |
| Ad-Studio Group Limited | London | 2021 |
| Ad-Value Consulting Limited | Burgess Hill | 2013 |
| Ad-Vance Controls Ltd | Chorley | 2024 |
| Ad-Vance Engineering (Lisburn) Ltd | Lisburn | 2012 |
| Ad-Venture Media Ltd. | Marlborough | 2000 |
| Ad-Venture Trailers Ltd | London | 2023 |
| Ad-Veterprises Ltd | Glasgow | 2017 |
| Ad-Vin Ltd | London | 2026 |
| Ad-Vise (UK) Limited | Bromsgrove | 2006 |
| Ad.Bunny Ltd | Luton | 2025 |
| Ad.Con Europe Ltd | Potters Bar | 2010 |
| Ad.Surf.Eng. Limited | Chester | 2001 |
| Ad.Ventures London Ltd | Newbury | 2012 |