| A to BEE Property Ltd | Real estate | 2021 |
| A to BEE Short Stays Limited | Real estate | 2026 |
| A Warburton Building Services Limited | Construction | 2012 |
| A Wynne Consulting Limited | Professional & scientific | 2025 |
| A&A Developments (Residential) Limited | Real estate | 2021 |
| A&A UK Developments Ltd | Real estate | 2025 |
| A&R Car Sales Ltd | Wholesale & retail | 2023 |
| A&S Investment Group Ltd | Real estate | 2022 |
| A&T Trading Ltd | Wholesale & retail | 2026 |
| A,C Excavation’S Ltd | Construction | 2022 |
| A. Cowie & Sons FUN Fairs Ltd | Hospitality | 2015 |
| A. E. Building Services (Lancs) Limited | Construction | 2013 |
| A. Gardner (Bury) Limited | Real estate | 1958 |
| A. J. & L. Taylor UK Ltd | Manufacturing | 2006 |
| A. Mullineau Limited | Construction | 2003 |
| A.Aqdas Property Ltd | Real estate | 2025 |
| A.C. Packaging Co. Limited | Wholesale & retail | 1979 |
| A.E.& H.Robinson & Co.Limited. | | 1948 |
| A.G Finest Catch Ltd | Wholesale & retail | 2023 |
| A.G.E. Limited | Real estate | 1965 |
| A.H Property Ventures Ltd | Real estate | 2024 |
| A.L Physio Ltd | Other services | 2024 |
| A.R.B. Sales Limited | Wholesale & retail | 1980 |
| A.Williamsproperties Ltd | Households | 2025 |
| A.Z.R. Associates Ltd | Professional & scientific | 2015 |
| A1 Grocery Ltd | Wholesale & retail | 2020 |
| A1 Ortos Holdings Limited | Wholesale & retail | 2024 |
| A1 Ortos Limited | Wholesale & retail | 2008 |
| A1 Properties Northwest Limited | Real estate | 2014 |
| A1 Van Breakers Limited | Wholesale & retail | 2018 |
| A2B Office Technology Ltd | Administrative & support | 2003 |
| A2B Roofing North West Ltd | Construction | 2025 |
| A2V Conversions Ltd | Wholesale & retail | 2024 |
| A3 Prop Co Limited | Real estate | 2025 |
| AA Locum Services (UK) Limited | Health & social care | 2011 |
| AA Scaffolding NW Ltd | Construction | 2026 |
| AA Suru Takeaway Ltd | Hospitality | 2026 |
| AAF Components Ltd | Manufacturing | 2010 |
| AAG FIC Limited | Real estate | 2015 |
| AAK Flooring Limited | Construction | 2016 |
| Aardvark Automotive Ltd | Wholesale & retail | 2013 |
| Aardvark Recovery Ltd | Transport & logistics | 2018 |
| Aaron B Limited | Manufacturing | 2023 |
| Aaron B Services Ltd | Administrative & support | 2025 |
| Aaron Food Store Limited | Other services | 2017 |
| Aaron Grocers Limited | Wholesale & retail | 2023 |
| Aaron Kelsall Ltd | Information & communication | 2017 |
| AB Imaging Services Limited | Health & social care | 2023 |
| AB Prime Ltd | Construction | 2021 |
| AB Properties Preston Ltd | Real estate | 2021 |
| Ab&C Property Ltd | Households | 2026 |
| Abacus Business Sales Limited | Real estate | 2012 |
| Abacus Management Limited | Administrative & support | 2016 |
| Abaseen One Ltd | Hospitality | 2024 |
| Abbas Housing Ltd | Real estate | 2021 |
| Abbas Shutters & Shopfronts Ltd | Manufacturing | 2025 |
| Abbey Attachments Limited | Wholesale & retail | 1984 |
| Abbey Locums Limited | Health & social care | 2012 |
| Abbeywood (Tottington) Limited | Health & social care | 1998 |
| ABC Pre-School Limited | Education | 2003 |
| Abercarn Store Ltd | Wholesale & retail | 2014 |
| ABG Consultancy (UK) Ltd | Administrative & support | 2012 |
| Ability Case Management Limited | Health & social care | 2019 |
| Ability TEC CIC | Manufacturing | 2012 |
| Able Hygiene Limited | Wholesale & retail | 2022 |
| Abmani Limited | Other services | 2021 |
| Abncorp Ltd. | Health & social care | 2012 |
| Abode Concept Limited | Construction | 2011 |
| Abreeirsh Ltd | Wholesale & retail | 2025 |
| ABS Supply Limited | Wholesale & retail | 2025 |
| Abseil Electrical Services Ltd | Construction | 2017 |
| Absolute Onions Ltd | Arts & recreation | 2019 |
| Absolute Value Capital Limited | Information & communication | 2019 |
| Abstract Aromas Ltd | Manufacturing | 2024 |
| Abuka's DEN Ltd | Health & social care | 2021 |
| ABZ EL Tourky Limited | Health & social care | 2024 |
| Acacia Trading Limited | Wholesale & retail | 2025 |
| Academia Connect Ltd | Professional & scientific | 2025 |
| Academy Childcare Ltd | Education | 2020 |
| ACB Projects Limited | Extraterritorial | 2007 |
| ACC Design & Build Limited | Construction | 2018 |
| Accepta Construction Limited | | 2010 |
| Accessfd Limited | Professional & scientific | 2012 |
| Accessible SKI Limited | Hospitality | 2025 |
| Accessible Sun Limited | Hospitality | 2024 |
| Accountancy Matters Limited | Professional & scientific | 2001 |
| Accountant Keeper Limited | Professional & scientific | 2023 |
| Accrion Accountants Ltd | Professional & scientific | 2026 |
| Accrue Energy Ltd | Energy | 2024 |
| Accuratio Solutions Limited | Professional & scientific | 2018 |
| Ace Cars Ltd | Wholesale & retail | 2015 |
| Ace Shutters & Shopfronts Ltd | Manufacturing | 2023 |
| ACF International Ltd. | Water & waste | 1984 |
| Achieve Community Training Ltd | Education | 2023 |
| Achieve Training Centre CIC | Education | 2014 |
| ACI Developments Limited | Construction | 2024 |
| Ackal Ltd | Public administration | 2026 |
| Ackley House Limited | Health & social care | 2026 |
| Acorn 20 Limited | Hospitality | 2020 |
| Acorn 21 Limited | Hospitality | 2020 |