| A.W.Instruments Ltd | Manufacturing | 2015 |
| A1 Auto Spare Parts Ltd | Wholesale & retail | 2014 |
| A1 Car Spot Ltd | Wholesale & retail | 2024 |
| A1 Care Solutions Ltd | Health & social care | 2025 |
| A1 Elite Consultancy UK Ltd | Administrative & support | 2025 |
| A1 PAT Testing NW Ltd | Extraterritorial | 2023 |
| A1 Plumbing & Heating NW Ltd | Construction | 2024 |
| A1CIVILS Limited | Construction | 2014 |
| A1GERMANSPARES Ltd | Wholesale & retail | 2020 |
| A2MU Ltd | Wholesale & retail | 2025 |
| A2Y Infrastructure Ltd | Construction | 2026 |
| A2Z Vehicle Solution Ltd | Wholesale & retail | 2024 |
| AA & CA Holdings Ltd | Financial services | 2026 |
| AA Accountax Ltd | Professional & scientific | 2019 |
| AA Cater Services Ltd | Hospitality | 2025 |
| AA Energy Solutions 2019 Ltd | Wholesale & retail | 2019 |
| AA Investments & Real Estate Ltd | Real estate | 2020 |
| AA Mobile Tyres (Blackburn) Ltd | Wholesale & retail | 2024 |
| AA Online Services Limited | Public administration | 2024 |
| AA Plumbing Heating & Electric Ltd | Construction | 2022 |
| AA Private Limited | Health & social care | 2018 |
| AA Properties (Blackburn) Ltd | Real estate | 2015 |
| AA Properties (NW) Ltd | Real estate | 2025 |
| AA Properties Holdings Limited | Financial services | 2016 |
| AA Steel Ltd | Wholesale & retail | 2026 |
| AA Tooth Clinic Ltd | Health & social care | 2026 |
| AAA Blackburn Builders Ltd | Construction | 2024 |
| AAA Partnership Ltd | Financial services | 2024 |
| Aaase Consultants Ltd | Professional & scientific | 2025 |
| Aabiya Fashions Ltd | Manufacturing | 2019 |
| AAD Locum Ltd | Health & social care | 2025 |
| Aahb Ltd | Manufacturing | 2021 |
| AAJ Enterprises Ltd | Hospitality | 2019 |
| AAK Traders Limited | Wholesale & retail | 2025 |
| AAM Locums Limited | Health & social care | 2011 |
| Aamdcb Global Ltd | Wholesale & retail | 2022 |
| Aamirh Enterprises Ltd | Wholesale & retail | 2023 |
| Aapharma Services Ltd | Health & social care | 2022 |
| AAR Smart Sell Ltd | Wholesale & retail | 2023 |
| Aaron Motors Ltd | Wholesale & retail | 2025 |
| Aaronkellyholdings Ltd | Real estate | 2026 |
| AAS Accountants Northwest Ltd | Professional & scientific | 2025 |
| AAS Consultants Ltd | Professional & scientific | 2013 |
| AAS Motors Ltd | Wholesale & retail | 2022 |
| Aasm.Trader Ltd | Wholesale & retail | 2025 |
| Aati Optical Ltd | Health & social care | 2015 |
| Aavp Ltd | Wholesale & retail | 2026 |
| AB Catering (Blackburn) Ltd | Wholesale & retail | 2018 |
| AB Healthcare Services Ltd | Health & social care | 2023 |
| AB Spice and General Trading Ltd | Wholesale & retail | 2026 |
| AB Transerve Ltd | Transport & logistics | 2010 |
| Abacus Properties (NW) Limited | Real estate | 2012 |
| Abak Developments Limited | Real estate | 2009 |
| Abak Properties Ltd. | Real estate | 2014 |
| Abba Auto Works Ltd | Wholesale & retail | 2018 |
| Abbasify Limited | Wholesale & retail | 2025 |
| Abbero Holdings Limited | Financial services | 2018 |
| Abbero Limited | Information & communication | 2018 |
| Abbey Coaches (Darwen) Limited | Wholesale & retail | 2003 |
| Abbey Design Engineering Ltd | Professional & scientific | 2023 |
| Abbey Flooring (North West) Ltd | Construction | 2003 |
| Abbey ICT Holdings Ltd | Financial services | 2018 |
| Abbey ICT Ltd | Information & communication | 1989 |
| Abbey Landscaping Limited | Administrative & support | 2010 |
| Abbey Mill Fireplaces Limited | Wholesale & retail | 2002 |
| Abbey Precision Tool Company Limited | Manufacturing | 1990 |
| Abbey Telecom Limited | Extraterritorial | 2020 |
| Abbix Limited | Wholesale & retail | 2025 |
| Abbott's of Blackburn Ltd | Financial services | 2023 |
| Abbotts Car Repairs Limited | Wholesale & retail | 1999 |
| Abbsol Ltd | Wholesale & retail | 2025 |
| Abby Fire (Northwest) Ltd | Professional & scientific | 2025 |
| ABC Food Mini Market Ltd | Wholesale & retail | 2026 |
| ABC Foods (Blackburn) Ltd | Wholesale & retail | 2024 |
| ABC Pharma Limited | Health & social care | 2015 |
| ABC Retail Shop Ltd | Wholesale & retail | 2026 |
| ABC Upholstery Limited | Manufacturing | 2002 |
| Abce Heritage Limited | Arts & recreation | 2009 |
| Aberdeen Music Lesson Ltd | Education | 2017 |
| Abexo Group Limited | Wholesale & retail | 2026 |
| Abhiramam Limited | Health & social care | 2022 |
| Abid Trust UK Ltd | Health & social care | 2025 |
| Abiha Mpharm Ltd | Health & social care | 2024 |
| Abival Limited | Financial services | 2016 |
| ABLE2 UK Limited | Manufacturing | 2003 |
| ABN Corporate Ltd | Wholesale & retail | 2021 |
| Above & Beyond Support Services Ltd | Health & social care | 2020 |
| ABP Agri Services Ltd | Other services | 2026 |
| Abpharm Ltd | Health & social care | 2018 |
| ABR Engineering Ltd | Professional & scientific | 2017 |
| Abraar Limited | Wholesale & retail | 2009 |
| Absolute Futbol Ltd | Arts & recreation | 2006 |
| Absolute Futbol Red Limited | Arts & recreation | 2016 |
| Absolute Property Renovations Limited | Construction | 2025 |
| Abst Ltd | Manufacturing | 2022 |
| Abstract Properties Limited | Real estate | 2006 |
| ABU Bakr Properties Ltd. | Real estate | 2016 |
| ABU Rayyan Group Ltd | Financial services | 2024 |
| AC Management (UK) Ltd. | Arts & recreation | 2011 |
| Accentia Arts Limited | Manufacturing | 2006 |