| Alans Games Ltd | London | 2025 |
| Alanta Power Engineering (UK) Co., Ltd | Peterborough | 2017 |
| Alanto Limited | Walsall | 2002 |
| Alanya Tyres Ltd | London | 2023 |
| Alar Engineering Limited | Cardiff | 1981 |
| Alara Apothecary Ltd | London | 2015 |
| Alara ROW Ltd | Brentford | 2025 |
| Alara Wholefoods Limited | London | 1984 |
| Alaris Investment Holdings UK Limited | Lincoln | 2016 |
| Alarm 2000 Ltd | Worcester | 2012 |
| Alarm PT Limited | Worthing | 2025 |
| Alarm Radio Monitoring Limited | Leominster | 1991 |
| Alarms Cameras & Access Control Systems Limited | Bedlington | 2011 |
| Alarms R Fixed UK Ltd | Holywell | 2013 |
| Alarmshock Ltd | Lancing | 2015 |
| Alarmtronic Limited | West Wickham | 1981 |
| Alarmue Ltd | Newark | 2024 |
| Alasdair Grigor Limited | Fortrose | 2010 |
| Alaska Cold Limited | London | 2026 |
| Alassala Limited | Nottingham | 2010 |
| Alatas Southern Europe Limited | Bradford | 2020 |
| Alatas UK Limited | Bradford | 1988 |
| Alate Ltd | Norwich | 2026 |
| Alatede Snacks and Foods Limited | Hatfield | 2019 |
| Alaturka Doner UK Ltd | Norwich | 2017 |
| Alava Limited | Liphook | 2018 |
| Alavia Limited | Deeside | 2017 |
| Alay's Bio-Innovations Ltd | Belfast | 2026 |
| Alaynah's Boutique Limited | Solihull | 2017 |
| Alazrak 1 Ltd | Ruislip, | 2024 |
| Alaïa Skin Ltd | London | 2025 |
| ALB Electritec Ltd | Barrow-In-Furness | 2014 |
| ALB Fabrications Limited | Warminster | 2026 |
| ALB Joinery Limited | London | 2020 |
| ALB Property Solutions Ltd | St. Albans | 2020 |
| ALB Specialists Ltd | Andover | 2023 |
| ALB1 Plumbing Heating & Electric Ltd | Cambridge | 2024 |
| Alba Beds Limited | Barking | 2000 |
| Alba Bioscience Limited | Penicuik | 2006 |
| Alba Diagnostics Limited | Stirling | 2026 |
| Alba Engineering Limited | Milton Keynes | 1990 |
| Alba Facilities Services Ltd. | Glasgow | 2003 |
| Alba Heating Limited | London | 2011 |
| Alba Orbital Limited | Glasgow | 2012 |
| Alba Printers Ltd. | | 1994 |
| Alba Proteins Penrith Limited | Halifax | 2006 |
| Alba Stone Limited | Enfield | 2007 |
| Alba Tyre Management Limited | Renfrew | 2004 |
| Albacom Limited | Dundee | 1989 |
| Albadaha Company for Modern Industries Limited | Hayes | 2022 |
| Albahuas Modular Ltd | Ardgay | 2025 |
| Albahumber Offshore Ltd | Edinburgh | 2018 |
| Albahus Engineering Ltd. | Coventry | 2020 |
| Alban Bicycle Bags Limited | London | 2014 |
| Alban Car Body Repairs Ltd | Dunstable | 2015 |
| Alban Cases Limited | Old Hatfield | 2002 |
| Alban Digital Limited | Wadebridge | 1998 |
| Alban Furniture Limited | Abbots Langley | 2017 |
| Alban Laser Systems Limited | Dunfermline | 2013 |
| Alban Pet Supplies Limited | Hemel Hempstead | 2018 |
| Albann Limited | Irvine | 2006 |
| Albany Engineered Composites, Ltd | Bury | 2017 |
| Albany Engineering Company Limited(The) | Glos | 1936 |
| Albany Engineering Group Limited | Lydney | 2008 |
| Albany Fabrications Ltd | Ashbourne | 2018 |
| Albany Farm & Garden Machinery Limited | East Cowes | 2010 |
| Albany International Limited | Lancashire | 1907 |
| Albany Lighting Limited | Congleton | 2002 |
| Albany Metal Spinners Ltd | Washington | 2014 |
| Albany Track Works Limited | Normanton | 2016 |
| Albanyoak Limited | Ross-On-Wye | 1983 |
| Albara Ltd | Bury St. Edmunds | 2024 |
| Albasense Ltd | Glasgow | 2018 |
| Albasma Aldhahabiya for Trading Company Ltd | London | 2026 |
| Albatec Racing Limited | Dumfries | 2012 |
| Albatross Aerospace Ltd | London | 2025 |
| Albatross Marine Ltd | Maldon | 2024 |
| Albatrosstech Ltd | Bicester | 2020 |
| Albaugh UK Limited | London | 2007 |
| Albber Ltd | London | 2022 |
| Albe (England) Limited | Middlesex | 1965 |
| Albea Creative UK Limited | Halstead | 2018 |
| Albea UK Limited | Halstead | 1899 |
| Alben Limited | West Bromwich | 1989 |
| Albeno Ltd | London | 2020 |
| Albergas Fabrications Ltd | Birmingham | 2012 |
| Alberlie Limited | Waltham Cross | 2024 |
| Albermarle Pianos Limited | Hemel Hempstead | 2003 |
| Albert Barbers Ltd | London | 2020 |
| Albert Blinds Ltd | Bradford | 2026 |
| Albert Browne Limited | Leicester | 1908 |
| Albert Clothing Ltd | London | 2020 |
| Albert E.James & SON Limited | Bristol | 1962 |
| Albert Equipment Co., Ltd | London | 2023 |
| Albert George Bespoke Limited | Londonderry | 2023 |
| Albert Jagger Engineering Limited | Bloxwich, | 1948 |
| Albert Jagger Limited | | 1937 |
| Albert Lewis Gunsmiths Limited | Great Marlings | 2026 |
| Albert Marsh and Bestelite Hardfacing Co Limited | South Yorkshire | 1945 |
| Albert Rees Ltd | Carmarthenshire | 2003 |