| Allied Law Chambers Solicitors Ltd | Professional & scientific | 2016 |
| Allied Professional Services Ltd | Professional & scientific | 2020 |
| Allied Services Group Ltd | Administrative & support | 2025 |
| Allied Standard Limited | Water & waste | 2002 |
| Alligate Limited | Financial services | 2020 |
| Alloa Holdings Ltd | Real estate | 2016 |
| Allow Trading Ltd | Construction | 2022 |
| Alloy Refurbz Ltd | Wholesale & retail | 2018 |
| Alloywheels.Com Limited | Wholesale & retail | 2006 |
| Allsorts 2002 Limited | Wholesale & retail | 2003 |
| Allssorts Ltd | Wholesale & retail | 2016 |
| Alltyres Supplies UK Ltd | Wholesale & retail | 2020 |
| Allure London Ltd | Other services | 2014 |
| Allwell Builders UK Limited | Construction | 2025 |
| Ally Advisory Ltd | Other services | 2025 |
| Ally Lotus Ltd | Professional & scientific | 2024 |
| ALM Enterprise Limited | Construction | 2020 |
| ALM Global Distributors Limited | Wholesale & retail | 2026 |
| Alma Matters Private Ltd | Information & communication | 2015 |
| Almand Limited | Real estate | 2016 |
| Almaral Limited | Wholesale & retail | 2012 |
| Almo Ortho Ltd | Health & social care | 2023 |
| Almond Gardens Property Ltd | Real estate | 2015 |
| Almshouse Estate Management Company Limited | Households | 2022 |
| Alnexa Ltd | Wholesale & retail | 2024 |
| Alnoor Homes Solution Ltd | Construction | 2025 |
| Alnoor Solutions Ltd | Wholesale & retail | 2025 |
| Aloebelloo Ltd | Real estate | 2020 |
| Alona Aesthetics Ltd | Wholesale & retail | 2025 |
| Alous Ltd | Information & communication | 2021 |
| ALP Business School Ltd | Education | 2020 |
| ALP Estates Ltd | Real estate | 2023 |
| ALP SH Ltd | Transport & logistics | 2025 |
| Alpha & Z Edge Limited | Wholesale & retail | 2025 |
| Alpha 24SEVEN Care Ltd | Health & social care | 2017 |
| Alpha Analytical Laboratories Ltd | Professional & scientific | 2013 |
| Alpha Beta Cart Ltd | Wholesale & retail | 2025 |
| Alpha Beta Pros Limited | Construction | 2025 |
| Alpha BIT Consulting Ltd | Professional & scientific | 2019 |
| Alpha Building Ltd | Construction | 2021 |
| Alpha Corporate Trustee Ltd | Administrative & support | 2025 |
| Alpha Couriers Ltd | Wholesale & retail | 2025 |
| Alpha Creations Limited | Wholesale & retail | 1996 |
| Alpha Estates (Essex) Limited | Real estate | 2011 |
| Alpha FM & Training Limited | Administrative & support | 2025 |
| Alpha Guarding & FM Ltd | Administrative & support | 2022 |
| Alpha Investments & Management Ltd | Real estate | 2025 |
| Alpha Land & Properties Ltd | Real estate | 2021 |
| Alpha Merchandise Ltd | Wholesale & retail | 2021 |
| Alpha Migss Enterprises Ltd | Construction | 2018 |
| Alpha Nexus Ltd | Administrative & support | 2024 |
| Alpha One Land Ltd | Real estate | 2025 |
| Alpha One Property Limited | Real estate | 2025 |
| Alpha Remediation Limited | Real estate | 2007 |
| Alpha Scaffold Design Ltd. | Professional & scientific | 2011 |
| Alpha Shopfront Shutter Ltd | Manufacturing | 2022 |
| Alpha Solutions Provider Ltd | Construction | 2022 |
| Alpha Sourcing Group Ltd | Wholesale & retail | 2026 |
| Alpha Trade and Transport UK Ltd | Wholesale & retail | 2019 |
| Alpha Travel Services Ltd | Transport & logistics | 2024 |
| Alpha Tutors Limited | Education | 2025 |
| ALPHA43 Ltd | Real estate | 2017 |
| Alphabet Films Limited | Information & communication | 2022 |
| Alphabet X Ltd | Transport & logistics | 2018 |
| Alphacross Limited | | 1988 |
| Alphaglazing Solution Ltd | Construction | 2019 |
| Alphaworlde Limited | Professional & scientific | 2002 |
| Alpine Activities Limited | Administrative & support | 2025 |
| Alpine Business Services Limited | Information & communication | 2023 |
| Alpine Clinics Limited | Other services | 2022 |
| Alpine Commerce Ltd | Wholesale & retail | 2022 |
| Alpine Integrated Services London Ltd | Administrative & support | 2025 |
| Alpine Meridian Limited | Wholesale & retail | 2026 |
| Alpine Properties (UK) Limited | Real estate | 2013 |
| Alpine Technical Solutions Ltd | Information & communication | 2024 |
| Alrite Productions Limited | Administrative & support | 2014 |
| Alrog Engineering Limited | Manufacturing | 1977 |
| ALS International Ltd | Wholesale & retail | 2020 |
| Alsaeed Ltd | Wholesale & retail | 2025 |
| Alshammari Properties Ltd | Real estate | 2026 |
| Alsibaai & Co Limited | Real estate | 2024 |
| Alssba Limited | Wholesale & retail | 2025 |
| Alsyedtraders.Uk Ltd | Wholesale & retail | 2026 |
| ALT Cruise Limited | Professional & scientific | 2021 |
| ALT Intel Ltd | Information & communication | 2026 |
| ALT Star Enterprises Ltd | Wholesale & retail | 2025 |
| Altaa Pete Limited | Health & social care | 2024 |
| Altaf Investments Limited | Other services | 2013 |
| Altech Assist Ltd | Information & communication | 2024 |
| Alterations Boutique City of London Ltd | Other services | 2025 |
| Alterations Boutique Islington Ltd | Other services | 2025 |
| Altered States Tailoring Specialist Limited | Other services | 2010 |
| Alterem Consulting Ltd. | Information & communication | 2013 |
| Alternative Wellbeing and Spa Ltd | Health & social care | 2025 |
| Altit Fort Ltd | Wholesale & retail | 2026 |
| Alton Ride Ltd | Transport & logistics | 2025 |
| Altrium Homes Ltd | Construction | 2019 |
| Altroute Builders Ltd | Construction | 2025 |
| Alvi & Alvi Healthcare Limited | Health & social care | 2021 |
| Alvi Solicitors Ltd | Professional & scientific | 2022 |