| ADP Consultancy Ltd | Worcester Park | 2022 |
| ADP Entertainment Ltd | Morden | 2021 |
| ADP Facilities Ltd | London | 2026 |
| ADP Film Services Ltd | Dromore | 2017 |
| ADP Music Ltd | London | 2014 |
| ADP Network Services Limited | Staines-Upon-Thames | 1967 |
| ADP Online Ltd | Ellesmere Port | 2019 |
| ADP Solutions Limited | Leeds | 2004 |
| ADP Systems Limited | Romford | 2012 |
| Adpeak Ltd | Gaerwen | 2026 |
| Adphare Limited | Billericay | 2023 |
| Adpilotpro Ltd | Littlehampton | 2025 |
| Adpins Ltd | London | 2024 |
| Adpk Ltd | Edinburgh | 2025 |
| Adplan Software Limited | Basildon | 2019 |
| Adplico Ltd | London | 2026 |
| Adplify Ltd | Manchester | 2025 |
| Adpoint Business Solutions Limited | Norwich | 2016 |
| Adpolymath Ltd | London | 2021 |
| Adporta Limited | London | 2026 |
| Adpost Network Ltd | Grantham | 2023 |
| Adpr Consultancy Ltd | London | 2020 |
| Adpretio Ltd | Hitchin | 2013 |
| Adprik Services Ltd | Wolverhampton | 2022 |
| Adpro Marketing Limited | London | 2021 |
| Adprops Limited | Manchester | 2010 |
| Adptv Limited | Kington | 2021 |
| Adpv Ltd | Burnham-On-Crouch | 2015 |
| ADQ Consulting Limited | London | 2009 |
| Adquantum Ltd | London | 2026 |
| Adqura Holdings Ltd | Milton Keynes | 2023 |
| Adqura Limited | Milton Keynes | 2011 |
| ADR Advisory Limited | London | 2013 |
| ADR Analytics Ltd | Halifax | 2026 |
| ADR Digital Ltd | Blackburn | 2026 |
| ADR Events Limited | Wakefield | 2019 |
| ADR Home Innovations Ltd | Bristol | 2008 |
| ADR Operations Ltd | Edinburgh | 2019 |
| ADR Technology Limited | Birmingham | 2019 |
| ADR Transformation Limited | Belfast | 2026 |
| Adra Software Limited | London | 2002 |
| Adra Tech Ltd | Wokingham | 2024 |
| Adraam Ltd | London | 2021 |
| Adraho Ltd | Kettering | 2025 |
| Adrak Solutions Ltd | Manchester | 2017 |
| Adramyt Global Ltd | London | 2024 |
| Adrand Management Limited | Ilford | 2007 |
| Adrange Limited | London | 2023 |
| Adrastichyperlink. Ltd | London | 2017 |
| Adream Solutions Limited | Belfast | 2003 |
| Adreamcreation Limited | London | 2010 |
| Adreamseo Limited | London | 2013 |
| Adrena Technologies Ltd | Maidenhead | 2023 |
| Adrenal Ltd | London | 2024 |
| Adrenal Media Limited | Nottingham | 2023 |
| Adrenalin Pictures Ltd | London | 2026 |
| Adrenaline Entertainment Limited | London | 2000 |
| Adrenaline Productions Limited | Bodmin | 2023 |
| Adrenaline Studio Co Ltd | London | 2023 |
| Adrenaline Studios / Voicearchive UK Ltd. | Harrow | 2016 |
| Adrenaline UP Co Ltd | London | 2024 |
| Adrenalynn Entertainment Ltd | London | 2014 |
| Adrenalynn Productions Limited | London | 2025 |
| Adreusum Limited | Sevenoaks | 2020 |
| Adri Direct Ltd | London | 2021 |
| Adria Associates Ltd | London | 2022 |
| Adrialpe-Media London Limited | Sheffield | 2013 |
| Adrian AI Technologies Limited | Swindon | 2024 |
| Adrian Banton VFX Ltd | Melbourn | 2017 |
| Adrian Bird Limited | Maldon | 2009 |
| Adrian Bushby Productions Ltd | London | 2006 |
| Adrian Carrington Limited | | 2007 |
| Adrian Collins Limited | Portsmouth | 1998 |
| Adrian Cowderoy Consulting Ltd | Blackpool | 2015 |
| Adrian Croome Media Ltd | Ford | 2003 |
| Adrian Dunbar & Co Ltd | Bridgwater | 2016 |
| Adrian Furlonger Consulting Limited | Nottingham | 2022 |
| Adrian George Davies Ltd | Whitehills Business Park | 2019 |
| Adrian Greenwood Designs Limited | Liphook | 2023 |
| Adrian Greenwood Ltd | London | 2021 |
| Adrian Hill Fine Art Ltd | Holt | 2010 |
| Adrian Hodges TV Limited | London | 2010 |
| Adrian Hunter Ltd | Darlington | 2019 |
| Adrian J Hart Ltd | Weston-Super-Mare | 2015 |
| Adrian Judd Ltd | London | 2014 |
| Adrian Metcalfe Consulting Limited | London | 2008 |
| Adrian P Brown Consulting Ltd | Lytham St Annes | 2026 |
| Adrian P Jones Ltd | Colwyn Bay | 2023 |
| Adrian P Limited | Goole | 2024 |
| Adrian Page Limited | Thoroton | 2022 |
| Adrian Parry Ltd | Clevedon | 2017 |
| Adrian Price Consultancy Services Limited | High Peak | 2014 |
| Adrian Ruddock Consulting Ltd | London | 2025 |
| Adrian Russell Limited | Milton Keynes | 2015 |
| Adrian Sherratt Photography Limited | Bristol | 2010 |
| Adrian Snell Music Limited | Shepton Mallet | 2013 |
| Adrian Sureshkumar Contracting Limited | Woking | 2018 |
| Adrian Timberlake Ltd | Atherstone | 2022 |
| Adrian W Ltd | London | 2022 |
| Adrian Webster Limited | London | 1982 |