| Allnest Enterprise Ltd | Wholesale & retail | 2025 |
| Alloes Pharmaceuticals UK Ltd | Manufacturing | 2026 |
| Alloneword Studio Ltd | Information & communication | 2025 |
| Allow US Care Ltd | Health & social care | 2025 |
| Alloy Wheel Refurb Specialist Limited | Wholesale & retail | 2022 |
| Allroads Ltd | Transport & logistics | 2025 |
| Allround Traders Limited | Construction | 2024 |
| Allsaints Events Ltd | Professional & scientific | 2017 |
| Allscreens Glass Distribution Limited | Wholesale & retail | 2025 |
| Allscreens Nationwide Limited | Wholesale & retail | 2003 |
| Allsmets Ltd | Professional & scientific | 2019 |
| Allsop & Allsop Holdings Limited | Financial services | 2018 |
| Allsop Property Management Ltd | Real estate | 2020 |
| Allsopp Kanabar Limited | Financial services | 2014 |
| Allstar Acquisitions Ltd | Administrative & support | 2025 |
| Allstar Decorators Ltd | Administrative & support | 2023 |
| Allstar Events Hire Ltd | Hospitality | 2025 |
| Alltrax Group Ltd | Financial services | 2016 |
| Alltrendssupplies Ltd | Wholesale & retail | 2024 |
| Alluru Consulting Limited | Professional & scientific | 2025 |
| Alluvia Solutions Ltd | Administrative & support | 2026 |
| Allvinrs Ltd | Wholesale & retail | 2018 |
| Ally Developments Ltd | Real estate | 2024 |
| ALM Plumbing & Heating Limited | Construction | 2016 |
| Alma Investments Limited | Real estate | 2020 |
| Alma Narborough Ltd | Wholesale & retail | 2023 |
| Alma Park Limited | Real estate | 2008 |
| Alma Worcester Ltd | Wholesale & retail | 2025 |
| Almaaliah Ltd | Professional & scientific | 2023 |
| Alman Consulting Ltd | Professional & scientific | 2006 |
| Almari Designs Ltd | Construction | 2018 |
| Almarwa Travel Ltd | Transport & logistics | 2023 |
| Almas Ramly Services Ltd | Professional & scientific | 2024 |
| Almas Store Limited | Wholesale & retail | 2023 |
| Almighty Agency Ltd | Manufacturing | 2023 |
| Almington Ultimate Ltd | Transport & logistics | 2015 |
| Almohager Ltd | Transport & logistics | 2024 |
| Almond ARB & Ecology Limited | Agriculture & fishing | 2024 |
| Almond Cafe Ltd | Hospitality | 2025 |
| Almond Equestrian Academy CIC | Education | 2025 |
| Almond Equestrian Limited | Arts & recreation | 2022 |
| Almostafa Limited | Real estate | 2025 |
| Alnham Ltd | Transport & logistics | 2015 |
| Alnoor Dawakhana Ltd | Health & social care | 2024 |
| Alnouman Ltd | Wholesale & retail | 2024 |
| Alnuur Ltd | Wholesale & retail | 2021 |
| Alnwyn Limited | Real estate | 2024 |
| ALO Beirut Kitchen Ltd | Hospitality | 2023 |
| ALO Tehran Ltd | Hospitality | 2025 |
| Aloha Beauty Ltd | Other services | 2025 |
| Aloha Infotech Limited | Information & communication | 2025 |
| Alondra Hotel Limited | Hospitality | 2025 |
| Alonso Enterprises Limited | Wholesale & retail | 2022 |
| Alonzi's Ltd | Wholesale & retail | 2021 |
| ALP Machine Services Ltd | Manufacturing | 2008 |
| Alpaca Sisters Ltd | Education | 2021 |
| Alparq UK Limited | Arts & recreation | 2017 |
| Alpel Consulting Ltd | Information & communication | 2021 |
| Alpen Signs Limited | Manufacturing | 1986 |
| Alpha & Akuji Properties Ltd | Real estate | 2019 |
| Alpha 2 Bravo Ltd | Administrative & support | 2018 |
| Alpha Accident Management Ltd | Other services | 2016 |
| Alpha Air Fabrications Limited | Manufacturing | 2015 |
| Alpha Air Holdings Limited | Financial services | 2019 |
| Alpha Air Ventilation Services Limited | Wholesale & retail | 2015 |
| Alpha Air Ventilation Supplies Limited | Manufacturing | 2013 |
| Alpha Associates Accountants and Tax Advisors Limited | Professional & scientific | 2024 |
| Alpha Autism Care Limited | Health & social care | 2017 |
| Alpha AV Ltd | Real estate | 2022 |
| Alpha Beauty Lounge Limited | Other services | 2021 |
| Alpha Building and Storage Limited | Other services | 2018 |
| Alpha Cars & Accident Management Ltd | Other services | 2006 |
| Alpha Clothing Ltd | Manufacturing | 2017 |
| Alpha Club Supplements Ltd | Health & social care | 2026 |
| Alpha Electrics Limited | Manufacturing | 1990 |
| Alpha Europe Ltd. | Wholesale & retail | 2008 |
| Alpha Fintech Software Ltd | Information & communication | 2022 |
| Alpha Healthcare Services Ltd | Other services | 2013 |
| Alpha Housing Solutions Limited | Real estate | 2021 |
| Alpha HPB Ltd | Wholesale & retail | 2025 |
| Alpha Innovative Ltd | Information & communication | 2026 |
| Alpha Maintenance and Building Limited | Administrative & support | 2006 |
| Alpha Muscle Ltd | Wholesale & retail | 2024 |
| Alpha Omega Trading Limited | Water & waste | 2013 |
| Alpha One Insurance Limited | Construction | 2007 |
| Alpha Opco London 265 Rotherhithe Street Limited | Hospitality | 2014 |
| Alpha Opco Manchester 96 Portland Street Limited | Real estate | 2024 |
| Alpha Pharma Supplies Ltd | Wholesale & retail | 2012 |
| Alpha Plastering & Drylining (East Midlands) Ltd | Construction | 2004 |
| Alpha Propco Manchester 21 Dickinson Street Limited | Real estate | 2024 |
| Alpha Radiology Reporting Ltd | Health & social care | 2018 |
| Alpha S Aviation Ltd | Professional & scientific | 2019 |
| Alpha Security International Ltd | Administrative & support | 2022 |
| Alpha Support Limited | Other services | 2023 |
| Alpha Trading Cards UK Ltd | Wholesale & retail | 2025 |
| Alpha Tutorials | Education | 2009 |
| Alpha-Coscure Medical Limited | Health & social care | 2023 |
| Alpha-Imperial Private Ltd | Health & social care | 2014 |
| ALPHA102 Ltd | Real estate | 2020 |
| ALPHA8076 Limited | Manufacturing | 2015 |