| Almeida & Estulano Ltd | Wholesale & retail | 2025 |
| Almeida-King Associates Limited | Professional & scientific | 2016 |
| Almira Care Group Ltd | Administrative & support | 2026 |
| Almond Properties Limited | Real estate | 2012 |
| Almunir Trading Limited | Other services | 2025 |
| Alofa Health Limited | Health & social care | 2023 |
| Alok Enterprises Ltd | Wholesale & retail | 2023 |
| Alomer Investments Ltd | Real estate | 2026 |
| Alowoesin Holdco Ltd | Real estate | 2020 |
| Alpha & Omega Investments Limited | Financial services | 2020 |
| Alpha Bookkeeping and Accountancy Services Limited | Professional & scientific | 2017 |
| Alpha Bricks Ltd | Construction | 2024 |
| Alpha Building Service Limited | Construction | 2011 |
| Alpha CAD Ltd | Professional & scientific | 2025 |
| Alpha Index LAB Limited | Financial services | 2024 |
| Alpha One Media Ltd | Manufacturing | 2018 |
| Alphabet Capital Ltd | Financial services | 2016 |
| Alphabet Holdco Limited | Financial services | 2020 |
| Alphadeal Limited | Other services | 2017 |
| Alpharo Design Ltd | Manufacturing | 2025 |
| Alpsart Ltd | Manufacturing | 2025 |
| Alqas Limited | Professional & scientific | 2013 |
| Alrec Consultancy Ltd | Health & social care | 2025 |
| ALT Academy Ltd | Education | 2021 |
| Altar Group Ltd | Hospitality | 2026 |
| Alternate Legal Services Limited | Professional & scientific | 2021 |
| Alternative Inspection Limited | Professional & scientific | 2020 |
| Althemax International Limited | Wholesale & retail | 2025 |
| Alto's Hospitality Ltd | Hospitality | 2026 |
| Alton International Training Services Ltd | Administrative & support | 2020 |
| Altra Marketing & Consulting Ltd | Information & communication | 2025 |
| Altruar Limited | Wholesale & retail | 2018 |
| Alue Ltd | Extraterritorial | 2024 |
| Aluma Technologies Limited | Information & communication | 2009 |
| Alun Bedding Coaching and Consulting Limited | Professional & scientific | 2024 |
| Alushred Limited | Extraterritorial | 2006 |
| Alvaley Limited | Manufacturing | 2024 |
| Alvara Limited | Wholesale & retail | 2025 |
| Alver Investments Limited | Financial services | 2024 |
| Alvora International Ltd | Wholesale & retail | 2025 |
| Alxchange IT! Ltd | Wholesale & retail | 2016 |
| Alyon Permaculture Ltd | Agriculture & fishing | 2022 |
| AM & AM Property Management Ltd | Real estate | 2025 |
| AM Construction & Building Ltd | Construction | 2016 |
| AM Estate Holdings Limited | Households | 2026 |
| AM Mcdonald Property Limited | Real estate | 2018 |
| AM Robinson Property and Investments Limited | Real estate | 2026 |
| AM Squared Ltd | Professional & scientific | 2019 |
| AMA EOT Ltd | Financial services | 2022 |
| Amagia Digital Limited | Information & communication | 2026 |
| Amalfie Ventures Ltd | Wholesale & retail | 2025 |
| Amanah Holdings Group Ltd | Financial services | 2025 |
| Amandi Real Estate Limited | Real estate | 2026 |
| Amaris Fatima Ltd | Real estate | 2022 |
| Amaryllise Group Ltd | Information & communication | 2026 |
| Amas Distribution Limited | Wholesale & retail | 2025 |
| Amavoy Ltd | Manufacturing | 2025 |
| Amazing Property Services Ltd | Construction | 2024 |
| Amazures Limited | Wholesale & retail | 2019 |
| Amber Martinez Ltd | Arts & recreation | 2014 |
| Amber Property Wealth Management Limited | Administrative & support | 2012 |
| Amber Reports Ltd | Public administration | 2025 |
| Amber Rhino Limited | Hospitality | 2013 |
| Amber Vessel Ltd | Wholesale & retail | 2025 |
| Amberstone Associates Limited | Education | 2010 |
| Ambi Events Ltd | Hospitality | 2025 |
| Ambient Electrical Installations Limited | Construction | 2017 |
| Ambleside Publishing Ltd | Information & communication | 2025 |
| Amboseli Traders Limited | Wholesale & retail | 2025 |
| Amco (UK) Ltd | Water & waste | 2008 |
| AMD Law Limited | Professional & scientific | 2024 |
| AME Travel Limited | Administrative & support | 2022 |
| Amen Optics Limited | Health & social care | 2022 |
| Amendolara Holdings Limited | Information & communication | 2022 |
| American School BUS Co. Ltd | Transport & logistics | 2024 |
| American Writing Services Ltd | Information & communication | 2024 |
| Amethyst IT Solutions Ltd | Professional & scientific | 2023 |
| AMG Logistic Services Ltd | Transport & logistics | 2017 |
| AMH Ventures Limited | Wholesale & retail | 2025 |
| Amherst (MH) Limited | Financial services | 2025 |
| Amherst Group Holdings Limited | Financial services | 2025 |
| Amicus Support Services Ltd | Professional & scientific | 2022 |
| Amigos BSE Ltd | Hospitality | 2024 |
| Amin Empire Ltd | Other services | 2023 |
| Amino Lashes Ltd | Wholesale & retail | 2025 |
| Aminoapp Ltd | Information & communication | 2025 |
| Aminshar Ltd | Information & communication | 2017 |
| Amirah International Trading Ltd | Wholesale & retail | 2025 |
| AMK Gillingham Limited | Health & social care | 2025 |
| Amlec Engineering Ltd | Professional & scientific | 2021 |
| Ammu Food & Wine Ltd | Wholesale & retail | 2015 |
| Amnova Limited | Wholesale & retail | 2025 |
| Amoura Living Ltd | Financial services | 2025 |
| Amoyer Yeep Ltd | Wholesale & retail | 2025 |
| AMP Inc Ltd | Professional & scientific | 2019 |
| AMP Retail Management Ltd | Wholesale & retail | 2026 |
| Ampd Coaching Ltd | Health & social care | 2025 |
| Ampersand Aviation Limited | Transport & logistics | 2015 |
| Amphius Limited | Financial services | 2005 |
| Amplerise Limited | Information & communication | 2025 |