| Alves Construction Ltd | Construction | 2021 |
| Alves Technology Ltd | Information & communication | 2018 |
| Alvi's Fashion Ltd. | Wholesale & retail | 2013 |
| Alvin Seafoods Limited | Wholesale & retail | 2015 |
| Always Been Ltd | Administrative & support | 2024 |
| Always Prevail Limited | Wholesale & retail | 2026 |
| Alx.B. Limited | Transport & logistics | 2016 |
| ALY Pack Ltd | Wholesale & retail | 2024 |
| Alyn Meadows Management Company Limited | Households | 2012 |
| Alytheon Limited | Wholesale & retail | 2014 |
| AM & SON Limited | Hospitality | 2009 |
| AM and DJ Limited | Hospitality | 2023 |
| AM Building Maintenance Ltd | Construction | 2024 |
| AM Chin Properties Limited | Real estate | 2017 |
| AM Kitchenware and Luggage Limited | Wholesale & retail | 2025 |
| AM on Developments Ltd | Real estate | 2026 |
| AM Property Lets Limited | Real estate | 2016 |
| AM Services (Willesden) Limited | Construction | 2007 |
| AM Vehicle Management Ltd | Other services | 2018 |
| Am&Sons 24/7 Recovery Ltd | Transport & logistics | 2023 |
| AM2PM Mobile and Vape Town Limited | Wholesale & retail | 2023 |
| Am:Pm Lock & Key Solutions Limited | Construction | 2016 |
| AMA Investments Holdings Limited | Real estate | 2024 |
| AMA World Solution Ltd | Wholesale & retail | 2020 |
| Amairaa UK Retail Ltd | Wholesale & retail | 2026 |
| Amal Investments Limited | Extraterritorial | 1998 |
| AMALFICOAST2023 Ltd | Hospitality | 2023 |
| Amana Property Investment Limited | Real estate | 2016 |
| Amanah Education Ltd | Education | 2018 |
| Amanah Health and Wellbeing CIC | Education | 2025 |
| Amanda Kent Ltd | Health & social care | 2025 |
| Amanda Lamb Properties Ltd | Real estate | 2026 |
| Amandra Hair Limited | Wholesale & retail | 2026 |
| Amar (UK) Limited | Wholesale & retail | 2003 |
| Amarashi Limited | Wholesale & retail | 2010 |
| Amarelle Properties Ltd | Real estate | 2023 |
| Amari Head Spa Ltd | Other services | 2025 |
| Amarisbe Limited | Professional & scientific | 2024 |
| Amas Traders Ltd | Wholesale & retail | 2019 |
| Amat Property Ltd | Real estate | 2022 |
| Amauzo Property Solutions Ltd | Real estate | 2025 |
| Amaya 1008 Limited | Wholesale & retail | 2021 |
| Amaya Fashion Limited | Wholesale & retail | 2018 |
| Amazing Space Design & Build Limited | Construction | 2019 |
| Amba 10 Limited | Real estate | 2021 |
| Amba 24 Limited | Construction | 2021 |
| Ambassador Property Group Ltd | Real estate | 2023 |
| Ambassadors Lounge Limited | Hospitality | 2019 |
| Amber Aparthotel Ltd | Hospitality | 2015 |
| Amber Crisp Consulting Ltd | Professional & scientific | 2026 |
| Amber Fields Management Company Limited | Households | 2021 |
| Amberdel Management Limited | Households | 1971 |
| Ambers Beer Bellys Limited | Wholesale & retail | 2024 |
| Ambiental Advisor Ltd | Professional & scientific | 2025 |
| Amblecote Close Residents Company Limited | Households | 1967 |
| Ambleside House Management Limited | Households | 1985 |
| Ambreck LLP | | 2012 |
| AMC Market Ltd | Wholesale & retail | 2011 |
| AMD Creative Ltd | Information & communication | 2018 |
| Amdr Windows & Interiors Ltd | Construction | 2026 |
| Amedi Ltd | Other services | 2018 |
| Amee Nails Ltd | Other services | 2024 |
| Amep Glazing Ltd | Construction | 2026 |
| Americano London Ltd | Wholesale & retail | 2023 |
| Amerine Limited | Real estate | 1998 |
| Ameron Co. Ltd | Arts & recreation | 2018 |
| Amet Accountants Ltd | Professional & scientific | 2020 |
| Amethyst Global Freight Limited | Transport & logistics | 2003 |
| Amethyst Group Limited | Transport & logistics | 1992 |
| Amethyst Home Care Limited | Health & social care | 2010 |
| AMG Locksmith Limited | Other services | 2026 |
| AMG Tipper & Grab Hire Ltd | Water & waste | 2016 |
| Amgriffin Ltd | Health & social care | 2026 |
| AMH SS Limited | Real estate | 2026 |
| Amha Properties Ltd | Real estate | 2025 |
| Amia Consulting Ltd | Professional & scientific | 2013 |
| Amigo Records Ltd | Administrative & support | 2019 |
| Amingdon Ltd | Real estate | 2015 |
| Amin’S Property Limited | Real estate | 2025 |
| Amira NOR Limited | Real estate | 2025 |
| Amiri Property & Services Ltd | Real estate | 2024 |
| Amiros Group Ltd | Information & communication | 2026 |
| Amiros Holdings Limited | Financial services | 2026 |
| Amiru Sport Limited | Professional & scientific | 2016 |
| Amirza Consulting Ltd | Information & communication | 2025 |
| Amity Care Services Ltd | Administrative & support | 2022 |
| AMJ Ecom Ltd | Wholesale & retail | 2025 |
| AMJ Events Ltd | Information & communication | 2017 |
| AMK Accountants Ltd | Professional & scientific | 2012 |
| AMK Properties Investment Limited | Real estate | 2021 |
| AML Properties Investment Ltd | Real estate | 2025 |
| Amlabib Ltd | Wholesale & retail | 2022 |
| Amlani NIC Limited | Health & social care | 2023 |
| AMM Plumbing and Heating Ltd | Construction | 2022 |
| Ammafi Properties Ltd | Real estate | 2022 |
| Amna Beauty Shop Ltd | Wholesale & retail | 2025 |
| Amod Estates Limited | Real estate | 2024 |
| Amodeus Limited | Wholesale & retail | 2013 |
| Amok Ltd | Professional & scientific | 2000 |
| Amolo Limited | Wholesale & retail | 2019 |