| Alssamad Limited | Cardiff | 2025 |
| Alston Farm Limited | Kingsbridge | 2002 |
| Alston Hall Ltd | Plymouth | 2021 |
| Alston House Craf Ltd | Cardiff | 2020 |
| Alston House Limited | Bexhill | 2014 |
| Alstriplet Ltd | London | 2025 |
| Alsu Bistro Ltd | London | 2024 |
| Alsu Cafe Ltd | London | 2025 |
| Alsudais Ltd | Dagenham | 2026 |
| Alsulaymaniyah Limited | London | 2023 |
| Alsultan Foods Ltd | London | 2024 |
| Alsultan Limited | London | 1993 |
| Alsuqour Ltd | Harrogate | 2022 |
| Alsw London Ltd | London | 2020 |
| Alsworthy Farmstead Ltd | Holsworthy | 2022 |
| Alsz Limited | London | 2026 |
| ALT & BAT Ltd | London | 2019 |
| ALT Family Ltd | Wolverhampton | 2026 |
| ALT Outdoors Ltd | Brighton | 2026 |
| ALT Rock Limited | Bournemouth | 2024 |
| ALT TAB EST Ltd | Sheffield | 2025 |
| Alta BNB Ltd | Southampton | 2026 |
| Alta Loma Ltd | Bristol | 2024 |
| Alta Premises Limited | Hassocks | 2022 |
| Alta Restaurant Ltd | London | 2015 |
| Alta Whalley Ltd | Blackburn | 2026 |
| Alta Zinc Limited | Berwick Upon Tweed | 2026 |
| Altaf Sandfield Limited | Cardiff | 2018 |
| Altafez Ltd | London | 2026 |
| Altafsbalti Limited | Worcester | 2019 |
| Altagliopizza Ltd | Edinburgh | 2025 |
| Altai Mountain Shilajit Ltd | Cardiff | 2021 |
| Altakal Limited | Thornton Heath | 2021 |
| Altakal Services Ltd | Thornton Heath | 2021 |
| Altalia Ltd | Leeds | 2024 |
| Altamont PUB Co Ltd | Colchester | 2022 |
| Altan Chicken Ltd | Wrexham | 2019 |
| Altan Fish and Chips Ltd | Brighton | 2024 |
| Altandoor Limited | London | 2018 |
| Altans Way Ltd | London | 2025 |
| Altar Group Ltd | Bury St. Edmunds | 2026 |
| Altar Properties Yorkshire Ltd | Keighley | 2019 |
| Altaris Ltd | London | 2025 |
| Altavona House Limited | Oban | 2025 |
| Altay Crouch Hill Ltd | London | 2021 |
| Altay Ural Limited | Northampton | 2021 |
| ALTEA13 Ltd | Reading | 2022 |
| Alteh Ltd | Dunfermline | 2025 |
| Alter EGO Bars Ltd | Heanor | 2019 |
| Altera Property Solutions Ltd | Cardiff | 2025 |
| ALTERN8 Events Ltd | Shaftesbury | 2025 |
| Alterna Limited | Leigh-On-Sea | 2014 |
| Alterna Market Ltd | Birmingham | 2024 |
| Alternative Approach Supported Accommodation Ltd | Ellesmere Port | 2017 |
| Alternative Catering Ltd | Corby | 2020 |
| Alternative Foods and Beverages Ltd | London | 2025 |
| Alternative Game Limited | Spalding | 2010 |
| Alternative Grill Ltd | Leeds | 2024 |
| Alternative Hospitality Limited | London | 2020 |
| Alternative Lodges Limited | London | 2024 |
| Alternative the Food Group Ltd | Reading | 2024 |
| Alternative to Hotel Limited | Manchester | 2011 |
| ALTERNATIVE3 Ltd | Blackpool | 2024 |
| Altervice PA and Events Ltd | London | 2023 |
| Althor Limited | Ventnor | 2026 |
| Althorp Coaching Inn Limited | Uppingham | 2025 |
| Althorp Residencies Limited | Stourbridge | 2025 |
| Altian Limited | London | 2024 |
| Altibar Ltd | Bath | 2026 |
| Altido London Limited | London | 2014 |
| Altido Scotland Ltd | Edinburgh | 2015 |
| Altikulac Sunderland Ltd | Sunderland | 2020 |
| Altimo Ltd | Northampton | 2025 |
| Altin Grill Limited | Milton Keynes | 2025 |
| Altinbox Ltd | Sutton-In-Ashfield | 2024 |
| Altindis Catering Limited | London | 2020 |
| Altinnikoli@Marroccosrestaurant Limited | Hove | 2019 |
| Altinordu Limited | Stafford | 2024 |
| Altinova Ltd | Dagenham | 2025 |
| Altins Catering Ltd | Warrington | 2019 |
| Altinsis Ltd | London | 2024 |
| Altiora Management Ltd | London | 2025 |
| Altitude 28 Ltd | London | 2024 |
| Altitude 8611 Dining Ltd | Hemel Hempstead | 2026 |
| Altitude Executive Services Limited | London | 2014 |
| Altitude F&B Ltd | Cranleigh | 2023 |
| Altitude Property Services Ltd | Ilkley | 2022 |
| Altivo Premium Management Limited | Manchester | 2026 |
| Altmore (N.I.) Ltd | Fivemiletown | 2011 |
| Altmore Enterprise Limited | London | 2017 |
| Altnacealgach Inn Ltd | Lairg | 2019 |
| Alto Brew Ltd | London | 2026 |
| Alto Cafe Ltd | Enfield | 2025 |
| Alto Developments Ltd | Sheringham | 2015 |
| Alto Management (U.K.) Limited | Market Harborough | 1987 |
| Alto's Hospitality Ltd | Bury St. Edmunds | 2026 |
| Altogold Limited | Worthing | 1977 |
| Alton Accommodation Limited | Surrey | 2025 |
| Alton B&B Limited | Stoke-On-Trent | 2024 |
| Alton Bhinn Ltd | Stoke-On-Trent | 2024 |