| Address Publishing House Ltd | London | 2019 |
| Address Solutions Ltd | London | 2018 |
| Address Street Ltd | Blackpool | 2024 |
| Addresscloud Limited | London | 2009 |
| Addresscore Ltd | London | 2026 |
| Addressfull Limited | London | 2023 |
| Addressless Mailing Ltd | Liverpool | 2015 |
| Addrex.Co Ltd | Derby | 2026 |
| Addrss Ltd | Beverley | 2024 |
| Adds 20568 Ltd | Ruislip, | 2025 |
| Adds Technology Consultancy Limited | Kington | 2025 |
| Addsecure Limited | Reading | 1998 |
| Addsoft Solutions Limited | Slough | 2016 |
| Addtek Limited | Solihull | 2024 |
| Addtobag Ltd | London | 2020 |
| Adducent Ltd | Hertfordshire | 2004 |
| Addup Limited | London | 2018 |
| Addup.Money Ltd | Surbiton | 2019 |
| Addvantage Digital Solutions Ltd | Bolton | 2009 |
| Addvantage Technologies Ltd | Ringwood | 2017 |
| Addvertising.Org Limited | Glasgow | 2017 |
| Addvery Club Ltd. | London | 2023 |
| Addvoice Limited | Basingstoke | 2019 |
| Addwings Limited | London | 1997 |
| Addworth Leads Limited | Keighley | 2017 |
| Addy Consultants Limited | London | 2013 |
| Addy IT Ltd | Glasgow | 2025 |
| ADE AI Limited | London | 2026 |
| ADE Globaspace Limited | London | 2025 |
| ADE Holt Enterprises Limited | Birmingham | 2013 |
| ADE IT Limited | London | 2014 |
| ADE Mcadio Limited | Milton Keynes | 2013 |
| ADE Oladipo Ltd | London | 2020 |
| ADE Omole Consulting Limited | Erith | 2023 |
| ADE Rowbotham Limited | Stamford | 2007 |
| ADE Technology Europe Ltd | London | 2025 |
| ADE Technology Ltd | Woking | 2021 |
| Ade&Grace Ltd | West Bromwich | 2017 |
| ADE3 Ltd | London | 2017 |
| Adea System Information Technologies Ltd | London | 2024 |
| Adease Ltd | London | 2023 |
| Adebak Ltd | Bournemouth | 2021 |
| Adebas Ltd | Dagenham | 2022 |
| Adebayo Impact Studios Ltd | Newcastle Upon Tyne | 2026 |
| Adebusola Adeyemi IT Services Ltd | Newcastle Upon Tyne | 2023 |
| Adec (Arts Development in East Cambridgeshire) | Ely | 1994 |
| Adec Innovations UK Limited | Bourne End | 2021 |
| Adec Services Ltd | Grimsby | 2008 |
| Adec Solutions Limited | Bourne End | 2008 |
| Adech Global Enterprises Limited | Bristol | 2025 |
| Adechris Ltd | London | 2025 |
| Adecs (Norfolk) Limited | Norwich | 2002 |
| Adecs Limited | Coventry | 1992 |
| Adee Stobart Ltd | Near Doncaster | 2011 |
| Adeeb’S Ltd | Wishaw | 2025 |
| Adeegs Media Ltd | Newcastle Upon Tyne | 2025 |
| ADEELK1995 Limited | Morden | 2022 |
| Adeem & Sons Ltd | East Ham | 2023 |
| Adeem Tech Ltd | London | 2025 |
| Adeen IT Solutions Limited | West Ashby | 2014 |
| Adeen Solutions UK Limited | London | 2022 |
| Adeena Grubb Limited | Hastings | 2022 |
| Adeena Ltd | Grays | 2015 |
| Adeenus Limited | Kington | 2006 |
| Adefakky Limited | Liverpool | 2020 |
| Adeffect.Net Ltd | London | 2023 |
| Adehael Consulting Ltd | London | 2025 |
| Adehye Digital Services Limited | Croydon | 2024 |
| Adeia Europe Limited | London | 2019 |
| Adeimantos Ltd | London | 2026 |
| Adejemi Consultancy Limited | London | 2014 |
| Adek Solutions Ltd | Milton Keynes | 2023 |
| Adekk Digital Ltd | Andover | 2023 |
| Adeks-Bryte Solutions Limited | Gillingham | 2023 |
| Adel Intellectual Vision Ltd. | London | 2024 |
| Adel Mohamad Ltd | London | 2025 |
| Adel Web Design Ltd | Leeds | 2020 |
| Adelaide Tech Limited | Chiswick | 2022 |
| Adelaide Ventures III Limited | London | 2025 |
| Adelante Software Ltd | London | 2002 |
| Adelard Steel Limited | Bath | 1997 |
| Adelbry IT Services Ltd | Nottingham | 2017 |
| Adele Audio Ltd | Clapton | 2018 |
| Adele Fensham Consulting Limited | Bishop'S Stortford | 2023 |
| Adeleke Hassan Ltd | London | 2024 |
| Adeleke IT Consultancy (Aitc) Limited | Laindon | 2005 |
| Adelfos Consulting Limited | Gloucester | 2025 |
| Adelie Limited | Sevenoaks | 2026 |
| Adeline Movie Limited | London | 2026 |
| Adelivia Communications Limited | Manchester | 2024 |
| Adelma Ltd | Cardiff | 2026 |
| Adelo Technologies Limited | London | 2025 |
| Adelphi Digital Consulting Group Ltd | Kemerton | 2015 |
| Adelphi Films Limited | Birmingham | 1939 |
| Adelphi Parkland Limited | Shaftesbury | 1992 |
| Adelphi Studio Ltd | Barnsley | 2013 |
| Adelphi Testing Limited | Edinburgh | 2007 |
| Adelphia Limited | Luton | 2012 |
| Adelphoi Limited | | 1993 |
| Adelphoi Music Publishing Ltd | | 2000 |