| Allingham Consultancy Limited | London | 2019 |
| Allingham Research Ltd | Walton-On-Thames | 2021 |
| Allington Consult Limited | Shrewsbury | 2021 |
| Allington Hughes Limited | Wrexham | 2011 |
| Allington IP Ltd | Chippenham | 2014 |
| Allington Management Advisory Ltd. | Manchester | 2005 |
| Allington Marina Holding Company Ltd | Maidstone Kent | 1972 |
| Allington Trustee Company Limited | London | 2011 |
| Allinone-Arcade Ltd | Birmingham | 2024 |
| Allinonesurveys Limited | Southampton | 2015 |
| Allinoneword Advisors Ltd | London | 2025 |
| Allinoneword Ltd | London | 2019 |
| Allinscience Ltd | York | 2010 |
| Allinsitz Ltd | West Bromwich | 2022 |
| Allinson Consulting Limited | Wilmslow | 2009 |
| Allinson Limited | London | 1935 |
| Allinson Westlake Limited | Wetherby | 2024 |
| Allinsonlaw Limited | Langport | 2013 |
| Allintus Limited | Wirral | 2008 |
| Allinx-Tc Limited | Coventry | 2017 |
| Alliora Consulting Limited | Hitchin | 2025 |
| Alliott Wingham Limited | Hampshire | 2003 |
| Alliotts Registrars Limited | London | 1972 |
| Allipine Ltd | Norwich | 2022 |
| Allis Consultancy Ltd | London | 2024 |
| Allison & Co Limited | Glasgow | 2013 |
| Allison Advantage Limited | St. Clears | 2017 |
| Allison Business Solutions Ltd | Norwich | 2013 |
| Allison Change Consulting Limited | Lytham | 2014 |
| Allison E Cowen Limited | Sheffield | 2015 |
| Allison Embedded Systems Ltd | Edinburgh | 2023 |
| Allison Emms Consultancy Ltd | Dover | 2025 |
| Allison Garfield Ltd | Abingdon | 2021 |
| Allison Group Holdings Limited | Swansea Vale | 2023 |
| Allison Homes Group Limited | Peterborough | 2017 |
| Allison Joy Architects Ltd | Montrose | 2018 |
| Allison Ltd | Gillingham | 2009 |
| Allison Marlow Limited | London | 2022 |
| Allison Nuclear Limited | Workington | 2012 |
| Allison Park Holdings Limited | Swansea | 2011 |
| Allison Pike Partnership Limited | Stockport | 1999 |
| Allison Powell Architects Limited | Burton In Kendal | 2023 |
| Allison Property Consultants Ltd | Edinburgh | 2025 |
| Allison Railways Limited | Matlock | 2008 |
| Allison Services Ltd | Wetherby | 2024 |
| Allison Surveying Limited | Wymondham | 2019 |
| Allison Wells Solicitors Ltd | Birmingham | 2022 |
| Allister Communications Ltd | Sidcup | 2016 |
| Allister Godfrey Architects Ltd | Wantage | 2010 |
| Allistoncare Ltd | Manchester | 2023 |
| Allistor Bennett Solicitors Ltd | Leeds | 2025 |
| Allisun Limited | Heathfield | 2014 |
| Allium Accountancy Ltd | Cirencester | 2010 |
| Allium Associates Ltd | Shrewsbury | 2024 |
| Allium Bloom Ltd | Coulsdon | 2025 |
| Allium Communications Limited | Wimborne | 2006 |
| Allium Consultancy Limited | Gloucester | 2022 |
| Allium Consulting Group Limited | Esher | 2024 |
| Allium Environmental Limited | Redruth | 2015 |
| Allium Green Space Limited | Northwich | 2017 |
| Allium Insight Ltd | Malmesbury | 2023 |
| Allium Interior Solutions Limited | Windsor | 2016 |
| Allium Wood Limited | Bishop'S Stortford | 2009 |
| Allivet Ltd | Hayes | 2012 |
| Allkeen Limited | Borehamwood | 2024 |
| Allkenatics Ltd | London | 2024 |
| Allkins Consultancy Services Ltd | Fareham | 2024 |
| Allkor Ltd | Haddington | 2020 |
| Allkor Plus Ltd | Livingston | 2018 |
| Allkraft Design Ltd | Birmingham | 2023 |
| Alll Ltd | Hornchurch | 2026 |
| Alllift Ltd | Middlesbrough | 2022 |
| Allman Acquisitions (London) Limited | London | 2020 |
| Allman Communication Ltd | Derbyshire | 2006 |
| Allman Horrocks Consulting Limited | Banbury | 1996 |
| Allman R2 (London) Limited | London | 2019 |
| Allman Woodcock Limited | Norfolk | 2003 |
| Allmanni Limited | Epsom | 2025 |
| Allmarine Limited | London | 2017 |
| Allmarsh Consulting Ltd | London, | 2024 |
| Allmarsh Limited | Chesham | 1988 |
| Allmasi Legal Consultants Ltd | London | 2025 |
| Allmec Consulting Limited | London | 2012 |
| Allmech Engineering Ltd | Darlington | 2023 |
| Allmeida Limited | London | 2019 |
| Allmerus Capital Limited | London | 2016 |
| Allmerus Energy Limited | London | 2004 |
| Allmi Limited | Chippenham | 2001 |
| Allmore Limited | London | 2025 |
| Allmost Agency Limited | London | 2018 |
| Allmotion Hydraulics Ltd | Grimsby | 2022 |
| Allmpdiss Holdings Limited | Birmingham | 2011 |
| Allmumstalk Limited | Waddesdon | 2012 |
| Allo Allo Ltd | London | 2018 |
| Allo Consulting Ltd | London | 2022 |
| Allo Holding Limited | Washington | 2023 |
| Alloa Consultancy Ltd | London | 2012 |
| Allobroges Solutions Limited | London | 2015 |
| Allocate Professional Services Limited | Altrincham | 2025 |
| Allocate Resource Limited | Telford | 2023 |