| Allflow Dispense Ltd | Chorley | 2008 |
| Allfont Limited | South Yorkshire | 2003 |
| Allfood Trading Ltd | Studley | 2023 |
| Allform Precision Limited | West Midlands | 2000 |
| Allforms Co UK Ltd | Wolverhampton | 2005 |
| Allforms of Print (UK) Limited | West Midlands | 2005 |
| Allfuel Power Ltd | London | 2025 |
| Allgard Engineering Limited | Buckhurst Hill | 1981 |
| Allgas Services Limited | Stockport | 2003 |
| Allglass and Frameworks Limited | Bordon | 2009 |
| Allglass Reprocessors (U.K.) Limited | Paisley | 2001 |
| Allgo Mechanical Engineering Limited | Londonderry | 2008 |
| Allgood Manufacturing Limited | Birmingham | 1995 |
| Allgoode Ltd | Truro | 2014 |
| Allgreen Designs Ltd | Bourne | 2011 |
| Alliance Apparels Inspection Ltd | Oldham | 2018 |
| Alliance Brushes Limited | Redditch | 1993 |
| Alliance Deco Limited | Romford | 2021 |
| Alliance Design Services Limited | Bristol | 1998 |
| Alliance Direct Europe Limited | Crowborough | 2000 |
| Alliance Door Engineering Limited | Wigan | 2001 |
| Alliance Doors Limited | Dudley | 2018 |
| Alliance Electro Plating Limited | East Yorkshire | 2006 |
| Alliance Electronics Limited | Chesterfield | 1993 |
| Alliance Eurasia Ltd | London | 2021 |
| Alliance Fabrics Limited | Huddersfield | 2019 |
| Alliance Fire Systems Limited | Blackburn | 1990 |
| Alliance Graphics Limited | Bedford | 1998 |
| Alliance Industrial Doors Limited | Dudley | 1999 |
| Alliance Jewels Ltd | London | 2022 |
| Alliance Joinery Limited | West Midlands | 2005 |
| Alliance Machine Services Ltd | Chatham | 2005 |
| Alliance Medical Radiopharmacy Limited | Warwick | 2002 |
| Alliance Motors & Body Repairs Ltd | Wokingham | 2012 |
| Alliance Office Systems Limited | Halifax | 1994 |
| Alliance One Oilfield Ltd | Wakefield | 2021 |
| Alliance Pallets Group Limited | Birmingham | 2025 |
| Alliance Pharmaceuticals Limited | Chippenham | 1996 |
| Alliance Platform Lifts Limited | Tonbridge | 2011 |
| Alliance Print Ltd | Edinburgh | 2024 |
| Alliance Property Developments U.K. Limited | Surbiton | 1999 |
| Alliance Racing Limited | Rotherham | 2020 |
| Alliance Renovations Ltd | Trowbridge | 2023 |
| Alliance Sales Limited | Birmingham | 2003 |
| Alliance Site Services Limited | Bolton | 2025 |
| Alliance Snooker Limited | Liverpool | 1986 |
| Alliance Steel Services Limited | Hull | 2010 |
| Alliance Structures Limited | Hull | 2015 |
| Alliance Tooling Limited | Leicester | 1997 |
| Alliance Trading Group Ltd | Bedford | 2023 |
| Alliance Valves Group U.K. Ltd | Brighouse | 2018 |
| Alliance-Group Limited | Doncaster | 2014 |
| Allicio Nutrition Limited | Leek | 2014 |
| Allied Aerosystems Limited | Pontypridd | 1997 |
| Allied Aluminium Systems Ltd | Sheffield | 2024 |
| Allied Antz Ltd | Ruislip | 2021 |
| Allied Blenders and Distillers (UK) Limited | Edinburgh | 2022 |
| Allied Brand Packaging Limited | Alfreton | 2017 |
| Allied Equipment Limited | Lisburn | 1969 |
| Allied Fabrications Ltd | Leigh-On-Sea | 2003 |
| Allied Filter Systems Limited | Manchester | 1995 |
| Allied Foods Limited | East Yorkshire | 1951 |
| Allied Forces Limited | Cheltenham | 2012 |
| Allied Global Safety Ltd | Chorley | 2025 |
| Allied Global Tobacco Ltd | Surrey | 2005 |
| Allied Gold Limited | Coventry | 1985 |
| Allied Himalayan Salt Ltd | London | 2025 |
| Allied Holdings Limited | | 1995 |
| Allied Hygiene Systems Limited | Erith | 1990 |
| Allied Import Products Ltd | Walsall | 2016 |
| Allied Industrial Products Limited | Salford | 1986 |
| Allied Insulators Limited | Tunstall | 2010 |
| Allied International UK Ltd. | Falkirk | 1978 |
| Allied Knitwear Limited | Manchester | 2004 |
| Allied Machinery Limited | Leeds | 1992 |
| Allied Maintenance Power Services Limited | Merseyside | 2004 |
| Allied Materials Ltd | Hounslow | 2025 |
| Allied Mechanical Engineering Limited | Cardiff | 2002 |
| Allied Mills Limited | London | 2020 |
| Allied Musical Instruments Co., Ltd | West Midlands, England, | 2025 |
| Allied National Limited | London | 1996 |
| Allied Offices Direct Limited | Rowley Regis | 2007 |
| Allied Pallet Supplies Ltd | Purfleet | 2023 |
| Allied Precision Tooling Limited | Tavistock | 2013 |
| Allied Protek Engineering Solutions Limited | Grimsby | 2013 |
| Allied Response Group Limited | Bristol | 2026 |
| Allied Signs Limited | Sutton Coldfield | 1947 |
| Allied Sports & Leisure Limited | Failsworth | 1994 |
| Allied Storage Tanks Limited | Cardiff | 2014 |
| Allied Timber Manufacturing Limited | Coatbridge | 1985 |
| Allied Vehicles Limited | Lanarkshire | 1993 |
| Alligator Signs Ltd | Barnsley | 2015 |
| Allingham Beck Associates Ltd | Horsham | 2008 |
| Allinoscar Ltd | Cambridge | 2026 |
| Allins Limited | Torrington | 1997 |
| Allinson Print Limited | Louth | 1992 |
| Allison and Sons Ltd | Stranraer | 2024 |
| Allison Fountains Ltd | Banbury | 2003 |
| Allison Printers Limited | Northampton | 2014 |
| Allison Rodger Designs Limited | Farnham | 2004 |