| Addison Consulting Limited | Sutton Coldfield | 2016 |
| Addison Contract Services Ltd | Beverley | 2023 |
| Addison Conveyancing Limited | Bedford | 2023 |
| Addison Developments One Limited | Dorchester | 2007 |
| Addison Developments Two Limited | Dorchester | 2007 |
| Addison Engineering Company (Blackpool) Limited | Thornton-Cleveleys | 1979 |
| Addison Group Ltd | Wakefield | 2019 |
| Addison Hayes Limited | Guildford | 2017 |
| Addison Horsley Limited | Nottingham | 2017 |
| Addison James & Co Limited | London | 2007 |
| Addison LEE Investments Ltd | London | 2019 |
| Addison Legal Ltd | Manchester | 2022 |
| Addison Legal Services Ltd | London | 2025 |
| Addison Lewis Ltd | Manchester | 2021 |
| Addison Marine Ltd | Lymington | 2026 |
| Addison Miller Ltd | Benfleet | 2018 |
| Addison Planning Consultants Limited | Skipton | 2014 |
| Addison Project PLC | Thornton Cleveleys | 1997 |
| Addison Road Maisonettes Limited | Bromley | 1994 |
| Addison Social Housing Limited | Basildon | 2004 |
| Addison Tempest Limited | Torquay | 1985 |
| Addison Trustees Limited | Lytham St. Annes | 2025 |
| Addison Turl Limited | Salisbury | 2011 |
| Addison Way Ltd | Portsmouth | 2014 |
| Addison Workplace Consulting Ltd | Dunfermline | 2018 |
| Addison-Newland Ltd | Plaistow | 2023 |
| Addisonrees Planning Consultancy Ltd | Malvern | 2017 |
| Addisons Holdings Limited | Scarborough | 2026 |
| Addit Bookkeeping Services Ltd | Kent | 2006 |
| Addit Business and Accountancy Consultancy Limited | Chesterfield | 2021 |
| Addit Consultancy Ltd | Ripley | 2024 |
| Additae Artes Limited | Aldermaston | 2018 |
| Addition Accountancy Limited | Sheffield | 2008 |
| Addition Accountants Penzance Limited | Penzance | 2021 |
| Addition Accounting Services Limited | Leigh | 2011 |
| Addition and Submission Limited | Warlingham | 2021 |
| Addition Capital Ltd | London | 2020 |
| Addition Compliance Limited | London | 2015 |
| Addition Design Office Ltd | London | 2023 |
| Addition Global Ltd | Cardiff | 2023 |
| Addition Media Ltd | Chorley | 2019 |
| Additional Bookkeeping Company Limited | Poole | 2003 |
| Additional Safety Limited | Shotts | 2022 |
| Additional Underwriting Agencies (NO.9) Limited | One Lime Street | 1991 |
| Additions & Subtractions Limited | Exeter | 1998 |
| Additions Accountancy (Grantham) Ltd | Grantham | 2013 |
| Additions Accountancy Limited | London | 2025 |
| Additions Accountancy Services (Halifax) Ltd | Halifax | 2014 |
| Additions Accountants Limited | Hoylake | 2004 |
| Additions Book Keeping Limited | London | 2010 |
| Additions Contractors Limited | Norwich | 2014 |
| Additions Plus Ltd | Slough | 2017 |
| Additive Analytics Ltd | Telford | 2017 |
| Additive Consulting Limited | Cheadle | 2019 |
| Additive Design Ltd | Leeds | 2015 |
| Additive Designing Ltd | Downpatrick | 2017 |
| Additive Experimental Ltd | Petersfield | 2020 |
| Additive Futures Ltd | Holywell | 2016 |
| Additive Instruments Limited | Watford | 2019 |
| Additive Personalisation Limited | Glasgow | 2020 |
| Additive Studios Ltd | London | 2012 |
| Additive Sustainability Limited | Wallington | 2025 |
| Additive Technical Solutions Limited | Cottingham | 2026 |
| Additive.Earth Holdings Ltd | Barnstaple | 2023 |
| Additives Ltd | Windsor | 2025 |
| Additude Ltd | London | 2006 |
| Addix Ventures Limited | London | 2012 |
| Addixion Limited | Bracknell | 2015 |
| Addlepool Farm Trading Limited | Liverpool | 2020 |
| Addleshaw Booth & Co Limited | London | 1996 |
| Addleshaw Booth & Co Training Limited | London | 1998 |
| Addleshaw Goddard (Scotland) Secretarial Limited | Edinburgh | 1991 |
| Addleshaw Goddard (Scotland) Services Limited | Edinburgh | 1990 |
| Addleshaw Goddard IP Service Company Limited | London | 2003 |
| Addleshaw Goddard Limited | London | 2003 |
| Addleshaw Goddard Nominees Limited | London | 1962 |
| Addleshaw Goddard Secretarial Limited | London | 2003 |
| Addleshaw Goddard Services Limited | London | 2003 |
| Addleshaw Goddard Training Limited | London | 2003 |
| Addleshaw Goddard Trustees Limited | London | 1980 |
| Addleshaws Limited | London | 1988 |
| Addlestead Consulting Limited | Farnham | 2015 |
| Addlestone Keane Limited | Leeds | 2012 |
| Addlife Wills & Estate Planning Ltd | London | 2022 |
| Addlington-West Group Ltd | Lichfield | 2018 |
| Addlington-West Legal Ltd | Kenilworth | 2024 |
| Addmac Ltd | Clitheroe | 2023 |
| Addmaster Holdings Limited | Stafford | 2004 |
| Addmin Limited | Ilkley | 2002 |
| Addminus Services Ltd | Ilford, Essex | 2020 |
| Addmore London Ltd | Bromsgrove | 2017 |
| Addmore Precision Limited | Northampton | 2020 |
| Addo Accounting Ltd | Portsmouth | 2013 |
| Addo Commercial Services Ltd | Basildon | 2024 |
| Addo Design Ltd | Brentford | 2012 |
| Addo Finance Limited | Ilford | 2019 |
| Addo Limited | Richmond | 2017 |
| Addo Play Limited | Amersham | 2015 |
| Addo Solutions Limited | Solihull | 2025 |
| Addobees Consultancy Ltd | Hockley | 2026 |