| Aaron Mensah Racing Ltd | Arts & recreation | 2019 |
| Aaron PAY Limited | Professional & scientific | 2021 |
| Aaron Rail Limited | Construction | 2013 |
| Aasa (UK) Limited | Wholesale & retail | 2017 |
| Aasim Sial Ltd | Wholesale & retail | 2025 |
| AAT Consulting and Contracting Ltd | Professional & scientific | 2021 |
| Aazama Ltd | Real estate | 2026 |
| AB Energy (Holdings) Limited | Professional & scientific | 2016 |
| AB Energy Agency Co Limited | Manufacturing | 2015 |
| AB Fire Protection NW Limited | Construction | 2016 |
| AB Solution Recruitment Ltd | Administrative & support | 2024 |
| Ab&C Consultancy Limited | Professional & scientific | 2024 |
| AB82 Limited | Professional & scientific | 2012 |
| Abacus Building & Maintenance Solutions Ltd | Construction | 2018 |
| Abacus Enterprises Limited | Administrative & support | 2008 |
| Abacus Global Consultancy Services Ltd | Administrative & support | 2019 |
| Abacus Plumbing & Heating (Manchester) Ltd | Construction | 2021 |
| Abap Property Limited | Real estate | 2025 |
| Abbass Abodes Ltd | Real estate | 2021 |
| Abbey House (Poynton) Management Company Limited | Real estate | 2002 |
| Abbeycroft Management Company Limited | Extraterritorial | 2002 |
| Abbeyway Commercial (2) Ltd | Construction | 2019 |
| Abbeyway Commercial (3) Ltd | Construction | 2019 |
| Abbital Limited | Financial services | 2021 |
| Abbot and Mayhew Associates Limited | Professional & scientific | 2017 |
| Abbotsford Consultancy Limited | Professional & scientific | 2025 |
| Abbott & Bramwell Limited | Financial services | 1994 |
| Abbott Browne Limited | Information & communication | 2019 |
| Abbpharm Ltd | Professional & scientific | 2022 |
| ABC Building Maintenance Limited | Wholesale & retail | 2006 |
| ABC Speech and Language Therapy Ltd | Health & social care | 2026 |
| ABC Systems Engineering Ltd | Professional & scientific | 2025 |
| ABC Warranty Limited | Financial services | 2019 |
| ABCS2 Holdings Ltd | Financial services | 2016 |
| ABD Store Ltd | Wholesale & retail | 2026 |
| Abdul Qadeer Ltd | Wholesale & retail | 2025 |
| Abdullah & Rehman Corpuration Limited | Wholesale & retail | 2025 |
| Abdullah Innovations Ltd | Wholesale & retail | 2026 |
| ABE & Co Coffee Limited | Wholesale & retail | 2018 |
| Abelay Property Developments Ltd | Real estate | 2023 |
| Abelay Property Solutions Ltd | Real estate | 2023 |
| ABG Synergix Ltd | Health & social care | 2019 |
| ABH Office Ltd | Professional & scientific | 2024 |
| ABI Design Ltd | Administrative & support | 2009 |
| ABI Supplies Ltd | Wholesale & retail | 2015 |
| Abigco Limited | Information & communication | 2003 |
| Abitofcode Ltd | Information & communication | 2007 |
| Abitoy Company Limited | Transport & logistics | 2015 |
| Able 2 Physiotherapy and Pilates Limited | Health & social care | 2008 |
| Able Board Company Limited | Wholesale & retail | 1992 |
| Able Commercial Flooring Ltd | Construction | 2024 |
| Able Hydraulics Holdings Limited | Manufacturing | 2007 |
| Able Hydraulics Limited | Manufacturing | 1981 |
| Able Living Care Services Limited | Health & social care | 2013 |
| Able Lorry Loaders Holdings Limited | Manufacturing | 2017 |
| Able Lorry Loaders Limited | Manufacturing | 2013 |
| Ablemead Limited | Households | 1989 |
| Ableway Support Ltd | Health & social care | 2025 |
| ABM Sports Limited | Information & communication | 2003 |
| Abmretailer Ltd | Wholesale & retail | 2024 |
| Abode Beechfields Limited | Real estate | 2022 |
| Abode Park Lane Limited | Real estate | 2021 |
| Abode PD Limited | Construction | 2021 |
| Abode Property Development Ltd | Construction | 2015 |
| Abode Property Holdings Limited | Real estate | 2019 |
| Abode Property Management (NW) Ltd. | Real estate | 2011 |
| Abode the Brambles Limited | Real estate | 2022 |
| Aboudi Limited | Extraterritorial | 2023 |
| ABP Aviation Limited | Professional & scientific | 2016 |
| ABP Services Limited | Construction | 2020 |
| Abracazee Productions Limited | Extraterritorial | 2002 |
| Abrar Sattar Associates Ltd | Real estate | 2024 |
| Abraxas Advisory Ltd | Professional & scientific | 2026 |
| ABS Pubs Ltd | Hospitality | 2025 |
| Absg Finance Limited | Professional & scientific | 2022 |
| Absi Ventures Ltd | Wholesale & retail | 2025 |
| Absm Consultancy Group Ltd | Information & communication | 2015 |
| Absolute Care and Support (UK) Limited | Health & social care | 2012 |
| Absolute Edit Limited | Information & communication | 2020 |
| Absolute Plantation Shutters Limited | Construction | 2014 |
| Absolute Power Solutions Limited | Administrative & support | 2003 |
| Absolute Signage Solutions Ltd | Manufacturing | 2007 |
| Absolute Trade Shutters Limited | Wholesale & retail | 2020 |
| Absolutely Atrocious Games Ltd | Information & communication | 2026 |
| Absolutely Flawless Limited | Professional & scientific | 2016 |
| ABU Afifa Trading Ltd | Wholesale & retail | 2025 |
| Abuka Limited | Education | 2019 |
| Abyss Aquatic Warehouse Limited | Wholesale & retail | 2008 |
| AC Body Repairs Limited | Wholesale & retail | 2010 |
| AC Imaging Limited | Health & social care | 2023 |
| ACA Risks Limited | Financial services | 2016 |
| Acacia Cars Ltd | Other services | 2010 |
| Academic Skills and Support Ltd | Education | 2025 |
| Academy for Training and Coaching Limited | Professional & scientific | 2007 |
| Acarix Ltd | Manufacturing | 2021 |
| ACC Security Solutions Ltd | Administrative & support | 2008 |
| Accaamici Limited | Information & communication | 2025 |
| Acceleration Point Consulting Ltd | Professional & scientific | 2020 |
| Accelerator Consultants Limited | Professional & scientific | 2018 |
| Accenda Limited | Information & communication | 2007 |