| Armstrongs Construction Limited | Real estate | 2019 |
| Armstrongs Fish & Chips Limited | Wholesale & retail | 2004 |
| ARN Housing Limited | Real estate | 2026 |
| ARN Logistics Ltd | Transport & logistics | 2024 |
| ARN Oldham Ltd | Other services | 2014 |
| ARN Tyres Ltd | Wholesale & retail | 2018 |
| Arnet Digital Ltd | Information & communication | 2021 |
| Arnscheidt Consulting Ltd | Professional & scientific | 2023 |
| Aro's Crunchy Chicken & Pizza Ltd | Hospitality | 2025 |
| Arran Foods Limited | Hospitality | 2017 |
| Arranmore Imaging Ltd | Health & social care | 2015 |
| Array Group Ltd | Real estate | 2022 |
| Arrow Sixty Ltd | Administrative & support | 2021 |
| ARS Properties (NW) Ltd | Real estate | 2024 |
| Arsa Consulting Ltd | Professional & scientific | 2019 |
| Arshad & Sons Limited | Households | 2016 |
| Arshad Alam Investments Limited | Real estate | 2023 |
| Art Developments Ltd | Construction | 2019 |
| Arthive Labs CIC | Education | 2025 |
| Arthur Benjamin and Co Ltd | Wholesale & retail | 2022 |
| Arthur H. Barrie Ltd | Wholesale & retail | 2003 |
| Arti Sweet Centre Bolton Ltd | Wholesale & retail | 2024 |
| Artificial Grass Clean Limited | Other services | 2021 |
| Artificialis Ltd | Information & communication | 2019 |
| Artin Evolution Toys Ltd | Wholesale & retail | 2015 |
| Artisan Farm Supplies Ltd | Manufacturing | 2017 |
| Artist Freedom Limited | Information & communication | 2023 |
| Artiste International Entertainment Limited | Arts & recreation | 2007 |
| Artitudes Media Ltd | Information & communication | 2026 |
| Artivonics Limited | Professional & scientific | 2025 |
| Arts and Crafts Textiles Limited | Wholesale & retail | 2020 |
| Artspire Limited | Professional & scientific | 2025 |
| Aruk Traders Limited | Wholesale & retail | 2025 |
| Arundel Bakery Limited | Hospitality | 2019 |
| Arunothai Ltd | Hospitality | 2024 |
| Arvtech Limited | Professional & scientific | 2018 |
| Arwa Care Ltd | Health & social care | 2023 |
| ARY Builders Ltd | Construction | 2025 |
| Aryan Fashion Ltd | Wholesale & retail | 2025 |
| AS Storage Ltd | Administrative & support | 2025 |
| Asad Care Group Ltd | Health & social care | 2021 |
| Ascend Stratos Ltd | Professional & scientific | 2020 |
| Ascendah CIC | Other services | 2025 |
| Ascendant Apparels Ltd | Wholesale & retail | 2017 |
| Ascent Ethical Ltd | Professional & scientific | 2021 |
| Ascndesign Ltd | Professional & scientific | 2025 |
| Ascroft Laboratory Ltd | Professional & scientific | 2021 |
| Ascura Ltd | Health & social care | 2025 |
| Ascura Property Ltd | Real estate | 2025 |
| Asfusion Ltd | Hospitality | 2022 |
| ASH Crescent Properties Ltd | Real estate | 2022 |
| ASH Farm UK Company Ltd | Hospitality | 2008 |
| ASH Pharm Limited | Other services | 2014 |
| ASH Recovery Plus Ltd | Wholesale & retail | 2025 |
| Asha NR Limited | Health & social care | 2022 |
| Ashani Broadoak Mini Market Ltd | Wholesale & retail | 2012 |
| Ashara Group Ltd | Households | 2025 |
| Ashen Dreams Ltd | Wholesale & retail | 2026 |
| Asher Medical Limited | Health & social care | 2023 |
| Ashford LEE Limited | Administrative & support | 2024 |
| Ashim Limited | Wholesale & retail | 2025 |
| Ashley Close Ltd | Real estate | 2017 |
| Ashley Hale Kitchen Installations Ltd | Construction | 2024 |
| Ashleys’S Building Ltd | Construction | 2025 |
| Ashness Bridge Ltd | Real estate | 2005 |
| Ashott Limited | Hospitality | 2002 |
| Ashraf International Global Investments Ltd | Real estate | 2021 |
| Ashraf Locum Ltd | Professional & scientific | 2022 |
| Ashroad Limited | Manufacturing | 2020 |
| Ashtech Consultancy Services Limited | Information & communication | 2016 |
| Ashton & Co Construction Ltd | Construction | 2026 |
| Ashton Bakery Ltd | Manufacturing | 2025 |
| Ashton Denture Clinic Limited | Health & social care | 2018 |
| Ashton Towler Ltd | Financial services | 2023 |
| Ashwaynook Properties Limited | Real estate | 2006 |
| Ashwood Auto Ltd | Wholesale & retail | 2025 |
| Ashwood Automotive Ltd | Wholesale & retail | 2024 |
| Ashwood Composite Timber Company Limited | Construction | 2025 |
| Ashwood Motors Ltd | Wholesale & retail | 2020 |
| Ashwood Vehicles Ltd | Wholesale & retail | 2025 |
| Ashworth Electrical Limited | Professional & scientific | 2014 |
| Ashworth Electrical Services Limited | Construction | 1998 |
| Ashworth Gardens Management Limited | Households | 2001 |
| Ashy's Hotplate Ltd | Hospitality | 2026 |
| ASHY50 Rail Ltd | Construction | 2017 |
| Asia Continental (Oldham) Limited | Wholesale & retail | 2020 |
| Asian Cultural Rhythms Studio Ltd | Administrative & support | 2024 |
| Asian Designer Clothing Limited | Wholesale & retail | 2021 |
| Asian Wedding Broker Limited | Wholesale & retail | 2024 |
| Asiana Oldham Ltd | Other services | 2025 |
| Asif BTL Properties Ltd | Real estate | 2020 |
| Asif Properties Limited | Real estate | 2021 |
| Asif Saleem Ltd | Other services | 2012 |
| Asif Travels Limited | Transport & logistics | 2026 |
| ASK Pro Services Ltd. | Information & communication | 2026 |
| Aska Clothing Ltd | Wholesale & retail | 2026 |
| ASL Group 1953 Limited | Hospitality | 2017 |
| Aslam Property Management Ltd | Real estate | 2021 |
| ASM (Refurbishments & Decorators) Limited | Construction | 2013 |
| ASM Merchandise Ltd | Wholesale & retail | 2019 |