| Alfieh Ltd | Huntingdon | 2023 |
| Alfies Fancies CYF. | Usk | 2019 |
| Alfirtopia Limited | London | 2025 |
| Alfold Mower Centre Limited | Cranleigh | 2016 |
| Alford Building Consultancy Limited | Lightwater | 2014 |
| Alford Business Services Ltd | Rotherham | 2019 |
| Alford Engineering (South West) Limited | Devon | 2003 |
| Alford Engineering Limited | Trowbridge | 2021 |
| Alford Industrial Doors Ltd | Alford | 2025 |
| Alfrecell Limited | Alfreton | 1960 |
| Alfred a Dunhill Limited | Halifax | 2025 |
| Alfred Bekker API Limited | Goole | 2003 |
| Alfred Briggs (Alwood) Ltd | Craigavon | 2003 |
| Alfred Brown (Worsted Mills) Holdings Limited | Leeds | 2025 |
| Alfred Brown(Worsted Mills) Limited | Leeds | 1950 |
| Alfred Cheyne Engineering Limited | Westhill | 1996 |
| Alfred Enderby Limited | Grimsby | 1961 |
| Alfred Furniture Limited | Battlesbridge | 2021 |
| Alfred G Pearce Limited | King'S Lynn | 1970 |
| Alfred Lancaster Gunmakers Limited | Horsham | 2006 |
| Alfred Mcalpine Asphalt Limited | Edinburgh | 2021 |
| Alfred Reader & Company Limited | Corby | 1997 |
| Alfred Stones Limited | Halifax | 2012 |
| Alfreds Bread Limited | Frome | 2019 |
| Alfresco Potter Ltd | Cambridge | 2026 |
| Alfresco Solutions Europe Ltd | Epping | 2013 |
| Alfresco Systems (UK) Ltd | Colchester | 2025 |
| Alfreton Fabrications Limited | Barnet | 2005 |
| Alfroicu Ltd | Edgware | 2018 |
| Alfu Limited | Bristol | 2019 |
| Alfx Ltd | Nottingham | 2015 |
| Alfy Cosmetics UK Ltd | London | 2025 |
| ALG Electrical Limited | Abercynon | 2005 |
| ALG Packaging Limited | Edmonton | 2023 |
| Algae & Algae Ltd | London | 2019 |
| Algae Products International Ltd | Swansea | 2023 |
| Algaecon Ltd | Bury St Edmunds | 2022 |
| Algaenic Ltd | Burnham-On-Crouch | 2026 |
| Algal Omega 3 Ltd | Belfast | 2015 |
| Algam Ashdown Limited | Maldon | 1995 |
| Algamish Apps Ltd. | Cardiff | 2020 |
| Algar Air Compressed Air Engineers Ltd | Sheffield | 2011 |
| Algarve Composites Limited | Northampton | 2016 |
| Algarve Granite Limited | Northampton | 2004 |
| Algas Medical Installations Manufacturing Limited | Dumbarton | 2023 |
| Algebrew Brewery Limited | Petersfield | 2026 |
| Algeco UK Limited | Stockton-On-Tees | 1917 |
| Algemy Labs Ltd | Birmingham | 2024 |
| Algerian Delight Limited | London | 2022 |
| Algernon Precision Engineering Limited | Gateshead | 2001 |
| Alggates Ltd | London | 2024 |
| Algha Group Limited | Bath | 1996 |
| Algipharma UK Limited | Cardiff | 2017 |
| Algisys Aqua Limited | Edinburgh | 2025 |
| Algisys UK Limited | Edinburgh | 2023 |
| Algnition Ltd | London | 2024 |
| Algochem Limited | Huddersfield | 2008 |
| Algoil 99 Ltd | Wakefield | 2014 |
| Algon Ltd | Preston | 2001 |
| Algorhythmic Technology Limited | Bangor | 1994 |
| Algostim Research and Development Ltd | Haywards Heath | 2023 |
| Algram Group Limited | Southend-On-Sea | 1987 |
| Alguacil & Perkoff Ltd | London | 2011 |
| Algutis Medical Ltd | Peacehaven | 2022 |
| ALH Fabrications (Yorkshire) Ltd | Cardiff | 2024 |
| ALH Mechanical Services Ltd | Cramlington | 2025 |
| Alhaji Foods Ltd | London | 2019 |
| Alhambra Designs Ltd | London | 2021 |
| Alhashmia Services Ltd | Belfast | 2024 |
| Alhekma Stone Limited | Manchester | 2017 |
| Alhilly United Holding Scope OIL & GAS Limited | Staines-Upon-Thames | 2018 |
| Alho Aluminium Limited | Sutton Coldfield | 2025 |
| Alhrenewables Ltd | Llanfairfechan | 2025 |
| ALI Air Freshener Ltd | Birmingham | 2012 |
| ALI Arslan Ltd | Cambridge | 2020 |
| ALI Autos Motor Parts Ltd | Bolton | 2026 |
| ALI Baba Foods Ltd | London | 2021 |
| ALI Baba Hummus Ltd | Bristol | 2019 |
| ALI Baba Range Ltd | Bristol | 2019 |
| ALI Brothers Limited | Birmingham | 2012 |
| ALI Builders LDN Ltd | London | 2024 |
| ALI Co Group Ltd | London | 2025 |
| ALI Door Ltd | Mansfield | 2024 |
| ALI Hajveri (R.A.) Welfare Trust | Warwickshire | 2010 |
| ALI Ice Ltd | London | 2019 |
| ALI Jewellery Ltd | Birmingham | 2019 |
| ALI Paterson Limited | Fochabers | 2007 |
| ALI Pleiades UK Limited | Newtownabbey | 2025 |
| ALI Refrigeration Limited | Leicester | 2012 |
| ALI Sanit Industry Co., Ltd | Cambridge | 2025 |
| ALI Signs & Prints Ltd | Manchester | 2024 |
| ALI Specialists Limited | Ormskirk | 2022 |
| ALI Steel & Fabrications Ltd | Leicester | 2020 |
| ALI Stileman Ltd | Andover | 2022 |
| ALI Stringer Ltd | Coventry | 2026 |
| ALI Systems Limited | St Andrews Business Park | 1998 |
| ALI Welding Ltd | London | 2024 |
| Ali's Delish Ltd | Bury | 2021 |
| Ali's Luxury Bedding and Furniture Ltd | Birmingham | 2025 |
| Ali's Treats Ltd | Coventry | 2025 |