| Adept Taxation Services Limited | Oldham | 2026 |
| Adept Training Services Limited | Hoole Bank | 2002 |
| Adept-Nx Ltd | Thatcham | 2012 |
| Adepta Consulting Limited | Llanelli | 2023 |
| Adepta Limited | Norwich | 2008 |
| Adepta One Limited | Bolton | 2025 |
| Adepta Partners Ltd | Belfast | 2024 |
| Adeptability Limited | Street | 2023 |
| Adeptal Limited | Taunton | 2010 |
| Adeptcrest Limited | Norwich | 1981 |
| Adeptec Ltd | Leicester | 2026 |
| Adeptech Consultants Limited | Stoke Mandeville | 2005 |
| Adepteq Ltd | Milton Keynes | 2006 |
| Adeptify Ltd | London | 2023 |
| Adeptina Limited | Leatherhead | 2024 |
| Adeptio Corp Ltd | Birmingham | 2025 |
| Adeptio Ltd | Exeter | 2018 |
| Adeptio Pharmaceuticals Ltd | London | 2009 |
| Adeptiq Consulting Ltd | Guildford | 2014 |
| ADEPTLEAD2 Limited | Crawley | 2026 |
| Adeptli Ltd | Preston | 2022 |
| Adepto Acquisitions Ltd | Wirral | 2013 |
| Adepto Consulting Services Ltd | London | 2025 |
| Adepts Group Limited | Altrincham | 2021 |
| Adeptstar Limited | Tring | 2019 |
| Adeptus Certification and Inspections UK Limited | Exeter | 2017 |
| Adeptus Consultancy Limited | Worcester | 2025 |
| Adeptus Projects Ltd | Warrington | 2006 |
| Adeptus Radiologica Ltd | Tewkesbury | 2024 |
| Adequate Business Limited | Romford | 2018 |
| Adequita Capital Limited | London | 2016 |
| Ader & Associates Ltd | Ruddington | 2013 |
| Ader Architecture Design Limited | Cheam | 2014 |
| Adera Capital Ltd | Woodford Green | 2025 |
| Adera Consultancy Ltd | Ilford | 2025 |
| Aderay Ltd | London | 2019 |
| Aderco Limited | Fareham | 2012 |
| Adere Commercial Ltd | Hornchurch | 2025 |
| Adergrün Ltd | London | 2016 |
| Adergy Limited | Dunfermline | 2013 |
| Aderico Medical Ltd | Halstead | 2022 |
| Aderinto & Co Financial Services Ltd | Glasgow | 2006 |
| Aderinto & Co. Limited | | 1981 |
| Aderize UK Ltd | London | 2025 |
| Aderonke Apata Consultancy Ltd | London | 2021 |
| Aderyn Building Consultancy Limited | Cardiff | 2014 |
| Aderyn Ecology Ltd | Clynderwen | 2020 |
| Aderyn TAN Ltd | Tregaron | 2025 |
| Aderyn Ventures Limited | London | 2022 |
| Adesa Ltd | St. Albans | 2026 |
| Adesco Group Limited | Rotherham | 2024 |
| Adeseal Limited | Birmingham | 2013 |
| Adesfort Limited | Cardiff | 2004 |
| Adesign Engineering & Consultancy Ltd | London | 2024 |
| Adesignscompany Ltd | London | 2023 |
| Adesol Consultancy Limited | Birmingham | 2015 |
| Adeson Advisors Limited | Helions Bumpstead | 2023 |
| Adessa Limited | Melbourn | 2024 |
| Adesse Ltd | Stanford-Le-Hope | 2025 |
| Adesso Creative Limited | London | 2011 |
| Adesso Tech Limited | Loughton | 2015 |
| Adessy Associates Ltd | Kenley | 2011 |
| Adester Trading Limited | Worthing | 2011 |
| Adestus Limited | Sandwich | 2024 |
| Adeta Family Group Limited | London | 2016 |
| Adetech Ltd | Bolton | 2019 |
| Adetexs Ltd | Nottingham | 2015 |
| Adeux Designers Ltd | Hounslow | 2017 |
| Adev Group Ltd | London | 2025 |
| Adevinta UK Limited | London | 2020 |
| Adewarnerphotouk Ltd | Mitcham | 2018 |
| Adewole Limited | Norwich | 2023 |
| Adewuyi Healthcare Services Limited | Hull | 2022 |
| Adewuyi Ltd | Erith | 2014 |
| Adex Asbestos Consultants Ltd | Deal | 2025 |
| Adex Business Consultancy Limited | Fleet | 2012 |
| Adex Mapping Limited | Linford Wood | 2019 |
| Adex Safety Consultancy Ltd | London | 2018 |
| ADEX360 Ltd | Luton | 2024 |
| Adexdig Ltd | London | 2023 |
| Adexi's Services Ltd | Romford | 2019 |
| Adexperto Limited | London | 2025 |
| Adey Biogas Consulting Limited | Rowlands Castle | 2016 |
| Adey Development Ltd | London | 2026 |
| Adey Fitzgerald and Walker Ltd | Cowbridge | 2023 |
| Adey Holdings (2008) Limited | Haresfield | 2008 |
| Adey Holdings Limited | Loughborough | 2002 |
| Adey Interiors Limited | Rickmansworth | 2017 |
| Adey Marketing Ltd | Redhill | 2026 |
| Adey Technical Ltd. | Loughborough | 2011 |
| Adey, Fitzgerald & Walker (Cowbridge) Ltd | Cowbridge | 2015 |
| Adeyat Ltd | London | 2024 |
| Adeyemi Consultancy Ltd | Bristol | 2020 |
| Adeypharma Ltd | London | 2005 |
| Adeza Consulting Ltd | London | 2019 |
| ADF Accountancy Limited | Leeds | 2019 |
| ADF Analytics Ltd | London | 2025 |
| ADF Business Services Limited | Burnley | 2016 |
| ADF Coating Inspections Ltd | Dunfermline | 2026 |
| ADF Consultancy Ltd | Manchester | 2024 |