| Adelski Ltd | Bracknell | 2026 |
| Adelso Studio Ltd | London | 2026 |
| Adelsoft Limited | London | 2019 |
| Adelvium Ltd | Clanfield | 2024 |
| Ademconsult Limited | Leighton Buzzard | 2022 |
| Ademeje Ltd | London | 2023 |
| Ademer Limited | Manchester | 2023 |
| Ademic Consulting Limited | London | 2011 |
| Ademid Limited | London | 2025 |
| Ademonarch Ltd | South Croydon | 2016 |
| Adems Consults Limited | Northampton | 2014 |
| Ademti Software Ltd | Carlisle | 2015 |
| Aden Design Ltd | London | 2020 |
| Aden Engineering & Consultancy Ltd | Bexhill-On-Sea | 2020 |
| Aden Health Consultancy Ltd | London | 2023 |
| Aden IO Ltd | Leicester | 2018 |
| Aden Productions Limited | Cardiff | 1996 |
| Aden Services Ltd | Northampton | 2019 |
| Adenco Consulting Ltd | Wembley | 2007 |
| Adeni Consultancy Limited | Basingstoke | 2014 |
| Adenin Digital Services Ltd | Newcastle Upon Tyne | 2022 |
| Adenncast Limited | Rotherham | 2017 |
| Adenzo Software Ltd | London | 2013 |
| Adeo Scotland Ltd | Dundee | 2008 |
| Adeola Systems Limited | Marston Moretaine | 2018 |
| Adeopoint Limited | Addlestone | 2009 |
| Adepan IT Limited | Solihull | 2024 |
| Adepic Pictures Ltd | Preston | 2025 |
| Adepp Digital Ltd | London | 2022 |
| Adepsi Limited | Glasgow | 2021 |
| Adept AI Solutions Ltd | Slough | 2024 |
| Adept Business Systems UK Limited | Newbury | 2015 |
| Adept Care Limited | Wakefield | 2015 |
| Adept Cloud Solutions Ltd | Spalding | 2021 |
| Adept Coding Limited | Milton Keynes | 2018 |
| Adept Communications and Technology Limited | Leeds | 2003 |
| Adept Communications Ltd | Tolworth | 2004 |
| Adept Communications Systems Ltd | Farnham | 2012 |
| Adept Computer Support Limited | Salisbury | 1994 |
| Adept Control Systems Limited | London | 2005 |
| Adept Core Consulting Ltd | Whalley | 2018 |
| Adept Data Services Ltd | Gravesend | 2021 |
| Adept Design (Norfolk) Ltd | Norwich | 2003 |
| Adept International Limited | London | 2023 |
| Adept IS Limited | Northampton | 2015 |
| Adept IT Consultants (UK) Ltd | London | 2024 |
| Adept IT Ltd | Maidenhead | 2020 |
| Adept IT Solutions Ltd | Tring | 2019 |
| Adept Labs Limited | London | 2021 |
| Adept Learning Ltd. | Wolverhampton | 2020 |
| Adept Open Source Solutions Limited | Portmahomack | 2004 |
| Adept Payments Limited | Northwood | 2016 |
| Adept Power Solutions Ltd | Andover | 2003 |
| Adept Records Limited | Somerset | 2018 |
| Adept RF Limited | Southampton | 2013 |
| Adept Solutions Limited | Wellington | 2009 |
| Adept Space Ltd | London | 2013 |
| Adept Systems (Hull) Ltd | East Yorkshire | 1997 |
| Adept Technologies PVT Limited | Glasgow | 2019 |
| Adept Training Platforms Ltd | Leeds | 2026 |
| Adept Training Solutions Limited | Sittingbourne | 2025 |
| Adept-Tec Limited | Maidenhead | 2012 |
| Adepta Digital Services Ltd | Croydon | 2023 |
| Adeptable Ltd | Bury St. Edmunds | 2022 |
| Adeptai Consulting Limited | Wokingham | 2024 |
| Adeptbk Ltd | Kingston Upon Thames | 2023 |
| Adepte Limited | Runcorn | 2016 |
| Adeptech Limited | London | 2023 |
| Adepteo Limited | Stockport | 2009 |
| Adeptic Ltd | Dunblane | 2012 |
| Adeptium Consulting Ltd | Cambridge | 2010 |
| Adeptly AI Ltd | Leatherhead | 2019 |
| Adeptnex Ltd | Wixams | 2025 |
| Adeptnova Ltd | Glasgow | 2024 |
| Adepto Consulting and Media Limited | Mildenhall | 2020 |
| Adepts Creative Industries Ltd | Cardiff | 2015 |
| Adeptsoft Business Solutions Limited | Buckley | 2017 |
| Adeptsys Limited | Aylesbury | 2007 |
| Adepttech Consulting Ltd | London | 2025 |
| Adeptus Advisors Limited | London | 2026 |
| Adeptus Data Services Ltd | Wirral | 2024 |
| Adeptus Digital Ltd | London | 2024 |
| Adeptus Partners Ltd | Solihull | 2024 |
| Adeptus Software Limited | Cheltenham | 2006 |
| Adeptview Ltd | London | 2024 |
| Adequipt Ltd | Uxbridge | 2018 |
| Adequo Ltd | London | 2023 |
| Aderant Legal (UK) Limited | Birmingham | 2004 |
| Adero Consulting Limited | Purley | 2024 |
| Aderolabs Limited | London | 2025 |
| Aders Consulting Company Ltd | Manchester | 2025 |
| Aderyn Glas Ltd | Cardiff | 2019 |
| Ades-Bellevue-Consultancy-Services (Bacss) Ltd | Aberdeen | 2025 |
| Adesal Limited | Coventry | 2022 |
| Adesant Ltd | Swindon | 2020 |
| Adeseius Ltd | Nuneaton | 2022 |
| Adesiyan.Com Limited | Erith | 2019 |
| Adesmak Services Ltd | London | 2011 |
| Adessa HR Limited | Northwich | 2024 |
| Adesso Communications Limited | Harlow | 2015 |