| Alray Ltd | Real estate | 2021 |
| ALS Law Limited | Professional & scientific | 2019 |
| Altecdata Ltd | Information & communication | 2021 |
| Alternative Construction Education Ltd | Education | 2015 |
| Altruistic Limited | Information & communication | 2012 |
| Altura Energy Group Holdings Ltd | Financial services | 2025 |
| Altus Education Partnership | Education | 2017 |
| Alumee Luxe Ltd | Health & social care | 2025 |
| Alumee Luxe Salon Ltd | Other services | 2026 |
| Aluminium & Glass Systems Ltd | Construction | 2010 |
| Alzena Limited | Wholesale & retail | 2023 |
| AM & Brother Ltd | Professional & scientific | 2019 |
| AM General Contractors Ltd | Construction | 2023 |
| AM Heating and Plumbing Ltd | Manufacturing | 2024 |
| AM Optical Services Ltd | Health & social care | 2024 |
| AM Pyro Ltd | Professional & scientific | 2013 |
| AMA Cars Ltd | Wholesale & retail | 2018 |
| Amaan Supplies Ltd | Wholesale & retail | 2024 |
| Amal Homes Ltd | Real estate | 2026 |
| Amal Properties NW Limited | Real estate | 2023 |
| Amanah Foundation | Health & social care | 2020 |
| Amanda Mcclughin Property Ltd | Administrative & support | 2017 |
| Amateur Martial Association Limited | Arts & recreation | 2012 |
| Amaya Holdings Ltd | Real estate | 2021 |
| Amaya NR Limited | Financial services | 2018 |
| Amazing Hub Ltd | Wholesale & retail | 2021 |
| Amber Recruitment Limited | Professional & scientific | 2022 |
| Ambercare (North West) Ltd | Other services | 2009 |
| Ambers Hope Limited | Construction | 2021 |
| AMC UK Trader Ltd | Hospitality | 2023 |
| Amelia Couture Ltd | Wholesale & retail | 2021 |
| American Prime Soloution Ltd | Wholesale & retail | 2025 |
| AMG Properties (NW) Ltd | Real estate | 2018 |
| AMG Rehabilitation Ltd | Health & social care | 2016 |
| Amigos Real Ltd | Wholesale & retail | 2022 |
| Amini Creators Limited | Wholesale & retail | 2024 |
| Aminur Rahman Ltd | Professional & scientific | 2017 |
| AMJ & Co Accountancy Services Limited | Professional & scientific | 2026 |
| AMJ Davies Ltd | Professional & scientific | 2019 |
| AMJ Rochdale Ltd | Wholesale & retail | 2024 |
| Amjad and Sons Ltd | Wholesale & retail | 2024 |
| Amjad Courier Services 1109 Ltd | Transport & logistics | 2024 |
| AMK Shifa Medical Ltd | Health & social care | 2018 |
| Amm-Offshore Ltd | Construction | 2023 |
| AMN Export Limited | Manufacturing | 2012 |
| Amofilms Ltd | Information & communication | 2026 |
| Amonra IT Ltd | Information & communication | 2012 |
| Amos International Education Limited | Other services | 2024 |
| AMP Service Solutions Ltd | Real estate | 2020 |
| Amped Electrical Services Limited | Construction | 2018 |
| Ampera Ltd | Professional & scientific | 2013 |
| Ampm Legal Limited | Professional & scientific | 2025 |
| AMS QA Limited | Information & communication | 2011 |
| Amsi Security Ltd | Administrative & support | 2025 |
| Amsi UK Group Ltd | Financial services | 2025 |
| AMT Performance Ltd | Wholesale & retail | 2022 |
| Amtech Lighting Ltd | Wholesale & retail | 2021 |
| Amuk Ltd | Wholesale & retail | 2026 |
| AN Designer Ltd | Manufacturing | 2017 |
| Anas&Areen Co Limited | Households | 2026 |
| Anayx Ltd | Wholesale & retail | 2026 |
| Andrasta Holdings Ltd | Extraterritorial | 2025 |
| Andrea's Hospitality Ltd | Hospitality | 2025 |
| Andromache Limited | Information & communication | 2016 |
| Andy Burrill Ltd | Construction | 2005 |
| Anees Bella (Services) Ltd | Administrative & support | 2023 |
| Anees Bella Accountants Ltd | Professional & scientific | 2012 |
| Anees Bella Business Solutions Ltd | Administrative & support | 2026 |
| Anem Exclusives Ltd | Wholesale & retail | 2021 |
| Anflex Ltd | Professional & scientific | 2026 |
| Angel Manor Limited | Construction | 2017 |
| ANGELAMAE13 Ltd | Health & social care | 2022 |
| Angie's Angels Community Group CIC | Administrative & support | 2017 |
| Angies Beauty Seevices Ltd | Other services | 2023 |
| Anglo Brands Limited | Wholesale & retail | 2010 |
| Anglo Family Limited | Professional & scientific | 2002 |
| Anglo Recycling Technology Limited | Manufacturing | 1987 |
| Animal Athletics Ltd | Wholesale & retail | 2022 |
| Animo Tax and Accountancy Limited | Administrative & support | 2014 |
| Animus Online Ltd | Wholesale & retail | 2019 |
| Anita and Richard for Generations Ltd | Financial services | 2025 |
| Anjum Property Ltd | Real estate | 2023 |
| Annai Trading Ltd | Wholesale & retail | 2025 |
| Annamta Ltd | Other services | 2022 |
| Annisa Rochdale CIC | Education | 2022 |
| Annual Critical Care Symposium Limited | Administrative & support | 2019 |
| Annum Investments Ltd | Real estate | 2022 |
| Anons Consultants Ltd | Professional & scientific | 2026 |
| ANS Property Management Ltd | Real estate | 2020 |
| Ansa Group Ltd | Administrative & support | 2017 |
| Ansa Property Ltd | Administrative & support | 2022 |
| Ansel & Daniel Healthcare Limited | Health & social care | 2023 |
| ANT Trading Limited | Wholesale & retail | 2015 |
| Antalys Ltd | Professional & scientific | 2014 |
| Anthony Ugochukwu Igboanugo Ltd | Health & social care | 2023 |
| Antonio Daniel Ltd | Transport & logistics | 2015 |
| ANTOTRANS22 Ltd | Transport & logistics | 2018 |
| Anukrahah Private Ltd | Wholesale & retail | 2024 |
| Anything Thing on Line UK Ltd | Wholesale & retail | 2025 |
| Anytime Buys Ltd | Wholesale & retail | 2023 |