| A.W.LOGISTICS24 Ltd | Transport & logistics | 2019 |
| A1 Electronics Ltd | Manufacturing | 2013 |
| A1 Engineering Services Ltd | Professional & scientific | 2022 |
| A1 Hospitality Ltd | Administrative & support | 2019 |
| A1 Motorcycle Training and Sales Limited | Wholesale & retail | 2012 |
| A1 Plant Hire and Sales Limited | Administrative & support | 2024 |
| A1 Roofing & Damp Proofing Ltd | Construction | 2025 |
| A1 Supermarket Ltd | Wholesale & retail | 2024 |
| A1 Trophies & Print Supplies Ltd | Wholesale & retail | 2017 |
| A1 Truck and Trailer Ltd | Wholesale & retail | 2025 |
| A2Z Cars Yorkshire Ltd | Wholesale & retail | 2025 |
| A2Z Investments Yorkshire Ltd | Real estate | 2025 |
| A5 Asset Management Ltd | Real estate | 2025 |
| A67 Holding Ltd | Financial services | 2026 |
| A67 Properties Ltd | Real estate | 2026 |
| AA Estate Holdings Ltd. | Real estate | 2020 |
| AA Properties Portfolio Ltd | Real estate | 2025 |
| AAA Child Day Care Limited | Health & social care | 2024 |
| Aadhan Square Ltd | Wholesale & retail | 2023 |
| AAG Trading Ltd | Wholesale & retail | 2025 |
| Aahg Ltd | Real estate | 2023 |
| Aalberts Integrated Piping Systems Limited | Wholesale & retail | 1945 |
| Aalberts U.K. Limited | Professional & scientific | 1998 |
| Aamalnet Ltd | Information & communication | 2019 |
| Aaminah and Haleema Properties Ltd | Real estate | 2022 |
| Aan&Co Ltd | Wholesale & retail | 2026 |
| Aanc Logistics Ltd | Transport & logistics | 2025 |
| Aandika Ltd | Administrative & support | 2021 |
| Aannemersbedrijf DE Amer Ltd. | Construction | 2012 |
| Aaptera Ltd | Information & communication | 2025 |
| Aardvark Rail & Civil Engineering Ltd | Professional & scientific | 2025 |
| Aarish Medical Ltd | Health & social care | 2025 |
| Aarl Limited | Wholesale & retail | 2025 |
| Aaron Adams TM Ltd | Public administration | 2022 |
| AAT Sheds & Garages Ltd | Wholesale & retail | 2022 |
| AB Courier Direct Ltd | Transport & logistics | 2018 |
| AB Doncaster Engineering Ltd | Professional & scientific | 2025 |
| AB Golf Ltd | Wholesale & retail | 2025 |
| AB Play Limited | Arts & recreation | 2011 |
| AB Plus Limited | Wholesale & retail | 2020 |
| AB Polished Plaster Ltd | Construction | 2025 |
| AB Properties (Yorkshire) Limited | Real estate | 2016 |
| AB Transpeed Limited | Transport & logistics | 2019 |
| AB Wind Limited | Construction | 2025 |
| Ab.G.Persson Ltd | Transport & logistics | 2025 |
| Abacus Valuations Ltd | Real estate | 2021 |
| Abap Cargo Ltd | Transport & logistics | 2025 |
| Abap Plumbing Ltd | Construction | 2022 |
| Abaq AL Muttahida Ltd | Extraterritorial | 2026 |
| Abarise Limited | Information & communication | 2023 |
| Abbas Transport Solutions Ltd | Transport & logistics | 2025 |
| Abbcabb Limited | Professional & scientific | 2023 |
| Abbey Hamlet Management Company Limited | Households | 2002 |
| Abbey Road Agency Ltd | Real estate | 2022 |
| Abbitta Limited | Real estate | 2017 |
| ABC Polish Supermarket Limited | Wholesale & retail | 2024 |
| ABC Print London Limited | Manufacturing | 2020 |
| ABC Project Consultancy Ltd | Wholesale & retail | 2019 |
| ABC Trading Ltd | Financial services | 2025 |
| ABC9 Limited | Professional & scientific | 2006 |
| Abcn Limited | Construction | 2016 |
| ABE (Europe) Limited | Construction | 2019 |
| ABE Rail and Civils Consulting Ltd | Professional & scientific | 2025 |
| Abel Plumbing & Heating (Yorkshire) Ltd | Construction | 2016 |
| Abel Power and Control Solutions Limited | Manufacturing | 2007 |
| Aberford Accountants Limited | Professional & scientific | 2017 |
| Abernant Homes Limited | Construction | 2001 |
| Abevelit Services Ltd | Construction | 2025 |
| Abiramy Properties Limited | Real estate | 2026 |
| Abiramy Retail Limited | Wholesale & retail | 2020 |
| Abiv Transport Ltd | Transport & logistics | 2017 |
| Able Locum Limited | Health & social care | 2021 |
| ABM Property (Yorkshire) Ltd | Real estate | 2026 |
| ABM Residential Security Ltd | Administrative & support | 2026 |
| ABM Security & Monitoring Ltd | Administrative & support | 2026 |
| Abodoo Properties Ltd | Real estate | 2026 |
| About Face Aesthetics Ltd | Health & social care | 2018 |
| About Grace Ltd | Wholesale & retail | 2021 |
| About-Turn Interim Management Limited | Professional & scientific | 2001 |
| Above & Below Dive Centre Limited | Education | 2019 |
| Absolute Cabs Limited | Transport & logistics | 2013 |
| Absolute Cult Limited | Administrative & support | 2016 |
| Absolute Recovery Limited | Professional & scientific | 2012 |
| ABT Autos Ltd | Wholesale & retail | 2025 |
| Abtso Ltd | Wholesale & retail | 2024 |
| ABU IT Team Limited | Transport & logistics | 2021 |
| Abvs Group Limited | Transport & logistics | 2022 |
| Aby&Edy Trans Limited | Transport & logistics | 2018 |
| Acacia Creative Studio Ltd | Education | 2020 |
| Acacia Workshops Ltd | Arts & recreation | 2025 |
| Academy Sports (UK) Ltd | Wholesale & retail | 2011 |
| ACB Group Limited | Administrative & support | 2020 |
| ACCELER8 Group Limited | Education | 2022 |
| Accelerate People Solutions Limited | Arts & recreation | 2011 |
| Accelerate Running Company Ltd | Arts & recreation | 2018 |
| Accelerated Development Ltd | Professional & scientific | 2015 |
| Accelerating Development Consultancy Limited | Education | 2003 |
| Accepted Money Ltd | Financial services | 2019 |
| Access Quality Scaffolding Services Limited | Construction | 2011 |
| Access Regeneration Limited | Professional & scientific | 2012 |