| AJE Rentals Limited | Real estate | 2014 |
| AK Inns Limited | Hospitality | 2001 |
| Akebia Sustainable Trading Ltd | Real estate | 2020 |
| Akerbris Ltd | Real estate | 2022 |
| Akisfood Ltd | Hospitality | 2024 |
| Aksr Dham Limited | Wholesale & retail | 2019 |
| AL Hadid Trading Ltd | Construction | 2022 |
| AL Kayan AL Arabi Trading Ltd | Wholesale & retail | 2023 |
| AL Tasheer Company Ltd | Financial services | 2024 |
| Albert Einstein Universitaet Limited | Extraterritorial | 2008 |
| Alemira UK Ltd | Professional & scientific | 2021 |
| Alephoo Group Ltd | Professional & scientific | 2020 |
| Alexandra Court Development Ltd | Construction | 2020 |
| Alexiom Limited | Manufacturing | 2015 |
| Alicoin Foundation | Health & social care | 2019 |
| Alil Industrial Limited | Administrative & support | 2008 |
| Alindo Ltd | Professional & scientific | 2026 |
| Alive Estates Ltd | Real estate | 2022 |
| ALL Custom Roofing Ltd | Construction | 2023 |
| ALL Property Synergies Limited | Real estate | 2018 |
| ALL Seasons London Ltd | Wholesale & retail | 2022 |
| ALL Wired UP Electrics Ltd | Construction | 2024 |
| Alldate Media Ltd | Professional & scientific | 2016 |
| Alliance Capital Partners Limited | Information & communication | 2016 |
| Alliance Court (Ashford) Management Company Limited | Households | 1982 |
| Alliance Media Partners Estates Limited | Construction | 2025 |
| Alliance Media Partners International Limited | Information & communication | 2016 |
| Alliance Media Partners Limited | Information & communication | 2015 |
| Allied Neuro Therapy Limited | Health & social care | 2013 |
| Allora Services Ltd | Extraterritorial | 2021 |
| Almys Bakery and Desserts Ltd | Wholesale & retail | 2024 |
| Alonkaketoe Ltd | Real estate | 2025 |
| Alpha Investment Asset Management Ltd | Real estate | 2013 |
| Alpha Media Limited | Professional & scientific | 2026 |
| Altairon Media Ltd | Professional & scientific | 2026 |
| Althara Corporate Ltd | Professional & scientific | 2025 |
| Altiora Nexus Ltd | Professional & scientific | 2026 |
| Alvarez (UK) Ltd | Extraterritorial | 2005 |
| AM Investors Limited | Real estate | 2018 |
| AM Multi Media Ltd | Professional & scientific | 2025 |
| Amar Wholetrade Ltd | Wholesale & retail | 2020 |
| Amara Concept Ltd | Real estate | 2020 |
| Amazing Payments LLP | | 2023 |
| Amazone Property Ltd | Real estate | 2021 |
| Ambassador AID Ltd | Construction | 2026 |
| Ambience Venue Styling UK Ltd | Wholesale & retail | 2023 |
| Amir Simyar Ltd | Health & social care | 2021 |
| Amlibertas Property Rentals Ltd | Real estate | 2024 |
| AMM Steel Installing Ltd | Manufacturing | 2024 |
| AMP Releasing Limited | Information & communication | 2024 |
| Ampdean Ltd | Professional & scientific | 2011 |
| Ampere 1 Ltd | Real estate | 2022 |
| AMS Hair & Makeup Limited | Other services | 2020 |
| AMS Studio Limited | Information & communication | 2014 |
| AMS Tailwind Ltd | Professional & scientific | 2023 |
| AMY Victoria Ltd | Real estate | 2024 |
| Anak Tiga Ltd | Real estate | 2023 |
| Analytics Direct Ltd | Information & communication | 2023 |
| Analytics on Demand Ltd | Information & communication | 2018 |
| Anant Consulting Limited | Information & communication | 2022 |
| Anastasia Trust | Professional & scientific | 2021 |
| Ancella Property Investment Ltd | Real estate | 2020 |
| Ando Property Investments Ltd | Real estate | 2021 |
| Andorep Properties Ltd | Real estate | 2020 |
| Andrea Randt Stiftung Ltd | Professional & scientific | 2023 |
| Andy Harding Consultancy Limited | Professional & scientific | 2023 |
| Anem Properties Ltd | Real estate | 2023 |
| Angelus Group Ltd | Financial services | 2021 |
| Angelus Ventures Ltd | Information & communication | 2022 |
| Anghelie Groundwork Ltd | Construction | 2025 |
| Animora Ltd | Other services | 2025 |
| Anjamo Invest Ltd | Real estate | 2018 |
| Anjamo Properties Ltd | Real estate | 2018 |
| Annie Thai Massage Ltd | Health & social care | 2025 |
| Annoymous PUB Company Limited | Hospitality | 2025 |
| Anton Patru Ltd | Construction | 2017 |
| Antonius Properties Ltd | Real estate | 2025 |
| Anvapo Ltd | Education | 2021 |
| AP Guitar Limited | Education | 2012 |
| APC World Investments Ltd | Administrative & support | 2014 |
| Apiarium Limited | Hospitality | 2025 |
| Apres Polo Limited | Arts & recreation | 2007 |
| APT Air Conditioning Services Limited | Construction | 1998 |
| APV RCT Limited | Transport & logistics | 2026 |
| Aqas Property Services Limited | Construction | 2017 |
| AQB Transport Ltd | Transport & logistics | 2022 |
| Aquaoak Limited | Extraterritorial | 2014 |
| Aquarius Real Estate Ltd | Real estate | 2024 |
| Aquatic Enterprises UK Limited | Wholesale & retail | 2002 |
| Arbonn Properties Ltd | Real estate | 2021 |
| Arborgate Property Limited | Real estate | 2026 |
| Archetypical Limited | Professional & scientific | 2018 |
| Arcstringing Limited | Hospitality | 2026 |
| Arda Property Management Ltd | Professional & scientific | 2022 |
| Arelix Property Ltd | Real estate | 2025 |
| Arenz Family Ltd | Financial services | 2021 |
| Argarden Properties Ltd | Real estate | 2024 |
| Arika Healthtech Solutions Ltd | Wholesale & retail | 2025 |
| Armadillo Projects Ltd | Construction | 2024 |
| Armilex Properties Ltd | Real estate | 2022 |