| Ambacelar Ltd | Information & communication | 2022 |
| Ambala Foods Limited | Manufacturing | 2008 |
| Ambitious London Ltd | Wholesale & retail | 2024 |
| Ambrosia Desserts Limited | Wholesale & retail | 2022 |
| AMC Capital Ltd | Real estate | 2017 |
| Amelynn Holdings Limited | Other services | 2016 |
| Amen (SO BE IT) Ltd | Wholesale & retail | 2025 |
| Amenti the Awakener Limited | Health & social care | 2020 |
| American Nails JK Limited | Other services | 2016 |
| American Nails Shirley Limited | Other services | 2023 |
| AMG Recruitment Ltd | Construction | 2019 |
| AMG Specialist Consultants Ltd | Real estate | 2018 |
| AMH Attire Ltd | Wholesale & retail | 2024 |
| Amhurst Close Management Company Limited | Real estate | 2007 |
| Amin Enterprise Ltd | Health & social care | 2002 |
| Amin Properties Ltd | Real estate | 2024 |
| AML Estates Ltd | Real estate | 2024 |
| Ammah Serwaah Ltd | Professional & scientific | 2026 |
| AMO Team Ltd | Other services | 2024 |
| Amore Gowns Ltd | Wholesale & retail | 2017 |
| Amoss Construction Ltd | Construction | 2024 |
| Amoura Healthcare Ltd | Wholesale & retail | 2026 |
| Amowebb Limited | Real estate | 2021 |
| AMP Trades Intl Limited | Wholesale & retail | 2019 |
| Ampcore Engineering Ltd | Construction | 2022 |
| Ample Supported Housing Ltd | Hospitality | 2020 |
| Amptex Electrical Ltd | Manufacturing | 2026 |
| Ampthill Nail Limited | Other services | 2022 |
| AMS Media Limited | Other services | 2019 |
| Amss Private Limited | Health & social care | 2024 |
| AMU Accountants Ltd | Professional & scientific | 2026 |
| Amur Ltd | Information & communication | 2013 |
| AMY Nails (Enfield) Ltd | Other services | 2025 |
| AN Khang Portsmouth Limited | Other services | 2024 |
| AN Nails & Spa Limited | Other services | 2023 |
| Anahh Atelier Ltd | Hospitality | 2023 |
| Analytical Horizon Ltd | Information & communication | 2024 |
| Anamart Limited | Real estate | 2017 |
| Anasa Wellness & Spa Ltd | Health & social care | 2025 |
| Anastasia Greek Taverna Limited | Hospitality | 2008 |
| Anastasiou Property Investments Ltd | Real estate | 2022 |
| Anatolian Accountancy Ltd | Financial services | 2021 |
| Anchon Limited | Health & social care | 2019 |
| Anchorpoint Housing Services Ltd | Hospitality | 2026 |
| Andrea Jervis Ltd | Administrative & support | 2016 |
| Andreas Tasty Bites Ltd | Hospitality | 2025 |
| Andreirenov Ltd | Construction | 2021 |
| Andres Services Ltd | Construction | 2019 |
| Andrew Shadare Technology Services Ltd | Information & communication | 2021 |
| Andromeda Foods Limited | Hospitality | 2025 |
| Andy Baxter Bass & Guitars Limited | Wholesale & retail | 2012 |
| Andy's Tyres Ltd | Wholesale & retail | 2023 |
| Anelia 2019 Ltd | Construction | 2021 |
| Anevo Forever Limited | Administrative & support | 2025 |
| Anfade Limited | Information & communication | 2019 |
| Angel & Lina Limited | Other services | 2022 |
| Angel & Sons Accountants Ltd | Professional & scientific | 2021 |
| Angel Homes International Limited | Extraterritorial | 2008 |
| Angel I Media Limited | Professional & scientific | 2007 |
| Angel Lifting Ltd | Construction | 2016 |
| Angel Salon (London) Limited | Other services | 2018 |
| Angel Support ( Newham ) Limited | Health & social care | 2021 |
| Angel VN Limited | Other services | 2025 |
| Angelica Estates Limited | Real estate | 2014 |
| Angelis Medical Limited | Health & social care | 2013 |
| Angelos Balkans Ltd | Hospitality | 2024 |
| Angels Care Training Academy Ltd | Administrative & support | 2020 |
| Angels Caring Care Limited | Administrative & support | 2018 |
| Angels Haulage Ltd | Transport & logistics | 2016 |
| Angelus Alas Limited | Information & communication | 2012 |
| Anglia Lifts Ltd | Manufacturing | 2020 |
| Anglia Secure Homes (Developments) Limited | Real estate | 2008 |
| Anglia Secure Homes (Properties) Limited | Extraterritorial | 2008 |
| Anglo Agricultural Property Limited | Real estate | 2024 |
| Anglo Aquatic Holdings Limited | Financial services | 2025 |
| Anglo Property Holdings Limited | Financial services | 2025 |
| ANI D Management Limited | Administrative & support | 2022 |
| Anka Construction Ltd | Construction | 2025 |
| Ankacare Ltd | Health & social care | 2025 |
| ANN Khang Limited | Other services | 2019 |
| Anna's Family Kitchen Ltd | Hospitality | 2025 |
| Annaej Ltd | Wholesale & retail | 2021 |
| Anneiliaglams Ltd | Other services | 2024 |
| Another Level Lofts London Limited | Construction | 2012 |
| ANP Pro Solutions Ltd | Information & communication | 2026 |
| Anrell Co. Ltd | Health & social care | 2024 |
| Ansevan Ltd | Transport & logistics | 2016 |
| ANT Accountancy Limited | Other services | 2023 |
| ANT LDS Limited | Administrative & support | 2011 |
| ANT Merchants Ltd | Wholesale & retail | 2025 |
| ANT Pension Solutions Limited | Administrative & support | 2024 |
| Antares Night Ltd | Administrative & support | 2021 |
| Antep Bakery Ltd | Wholesale & retail | 2025 |
| Anteplioglu Pastanesi Ltd | Hospitality | 2016 |
| Anthap UK Limited | Wholesale & retail | 2017 |
| Anthos Properties Ltd | Real estate | 2025 |
| Antiagingmission Ltd | Extraterritorial | 2025 |
| Antie Josse's Kitchen Ltd | Hospitality | 2020 |
| Antonio Building Services Ltd | Construction | 2020 |
| Antoniou Productions Ltd | Information & communication | 2018 |