| A-Vault Inc. Ltd | Manufacturing | 2025 |
| A-Zcomputing Limited | Information & communication | 2015 |
| A. C. Rigging Limited | Extraterritorial | 2008 |
| A. C. Video Limited | Extraterritorial | 2008 |
| A. L. M. Services Limited | Administrative & support | 2003 |
| A. Wise Signs Limited | Manufacturing | 2007 |
| A.A.Haynes Limited | Wholesale & retail | 2010 |
| A.C. Audio Limited | Extraterritorial | 2007 |
| A.C. Enterprises (Services) Ltd | Wholesale & retail | 2024 |
| A.C. Entertainment Technologies Limited | Wholesale & retail | 1982 |
| A.C. Lighting (Holdings) Limited | Extraterritorial | 2019 |
| A.C. Lighting (Overseas) Limited | Professional & scientific | 2002 |
| A.C. Lighting Limited | Extraterritorial | 2008 |
| A.C. Special Projects Limited | Wholesale & retail | 1985 |
| A.C. Worldwide Group Limited | Professional & scientific | 2002 |
| A.D.A. Fastfix Limited | Manufacturing | 2002 |
| A.D.J. Flats Limited | Households | 1963 |
| A.Dreamer's Limited | Wholesale & retail | 2024 |
| A.F.S. Fire & Security Ltd | Other services | 2008 |
| A.G. Wilson Investments Limited | Real estate | 2015 |
| A.Hicks Limited | Real estate | 1962 |
| A.I.R Fashion Ltd | Real estate | 2017 |
| A.J.Andrews(Haulage)Limited | | 1968 |
| A.K. Grace Estates Ltd | Real estate | 2025 |
| A.L Plumbing & GAS Services Limited | Construction | 2023 |
| A.Marts Electrical Services Ltd | Construction | 2021 |
| A.Q.I Consultancy Ltd | Financial services | 2017 |
| A.R.S Holdings Trading Ltd | Wholesale & retail | 2026 |
| A.R.T. Installations Ltd | Construction | 2005 |
| A.S.A Heating & Plumbing Ltd | Construction | 2011 |
| A1 Ceilings and Partitions Ltd | Construction | 2009 |
| A1 Health Supplies Ltd | Wholesale & retail | 2020 |
| A1 London Trading Limited | Wholesale & retail | 2024 |
| A1 Opal Cars Ltd | Wholesale & retail | 2018 |
| A1 Special Care Limited | Health & social care | 2017 |
| A2B Beaconsfield Taxis Limited | Transport & logistics | 2022 |
| A2BPM Ltd | Real estate | 2007 |
| A2Z Painting & Decorating Ltd | Construction | 2025 |
| A40 Tyres Ltd | Manufacturing | 2021 |
| AA & KA Trading Limited | Wholesale & retail | 2025 |
| AA Bucks Courier Ltd | Transport & logistics | 2025 |
| AA Business Consultancy Nationwide Ltd | Professional & scientific | 2022 |
| AA Cloud Consultants Limited | Information & communication | 2022 |
| AA Design Associates Ltd | Professional & scientific | 2021 |
| AA GAS and Heating Services Ltd | Construction | 2019 |
| AA Group of Companies Ltd | Wholesale & retail | 2025 |
| AA Property Sevices Ltd | Construction | 2023 |
| AA Sizzler Limited | Hospitality | 2025 |
| AA Slough Ltd | Hospitality | 2020 |
| AA Work Solution Ltd | Information & communication | 2021 |
| Aa&Z Travel Limited | Transport & logistics | 2025 |
| AAA Bros Properties Ltd | Real estate | 2025 |
| AAA Driveway Solutions Limited | Construction | 2014 |
| AAA Foods Trading Ltd | Hospitality | 2019 |
| AAA Site Services Ltd | Construction | 2017 |
| AAA Vape Limited | Hospitality | 2017 |
| AAC Commercial Ltd | Financial services | 2024 |
| Aadhiya Imports and Exports Ltd | Wholesale & retail | 2024 |
| Aaep Ltd | Real estate | 2021 |
| Aahil Homes Limited | Real estate | 2020 |
| AAK Travel Ltd | Transport & logistics | 2018 |
| Aakshaya Trading Ltd | Wholesale & retail | 2024 |
| Aara Consultancy Ltd | Professional & scientific | 2026 |
| Aardvark Record Pressing Limited | Manufacturing | 2019 |
| Aardware Limited | Information & communication | 2004 |
| Aarer Limited | Administrative & support | 2020 |
| Aariv Property Holdings Ltd | Real estate | 2021 |
| Aask Group Limited | Financial services | 2022 |
| Aask Limited | Real estate | 2020 |
| Aask Wealth Limited | Real estate | 2022 |
| AB Effects Limited | Information & communication | 2017 |
| AB Impex Ltd | Extraterritorial | 2017 |
| AB Luxury Wear Ltd | Professional & scientific | 2026 |
| AB Yours Limited | Manufacturing | 2010 |
| ABA Audits Ltd | Transport & logistics | 2009 |
| Abacus Home Limited | Manufacturing | 2012 |
| Abacus Wills & Trusts Global Limited | Professional & scientific | 2019 |
| Abba Cars (High Wycombe) Limited | Transport & logistics | 2010 |
| Abba Properties Limited | Real estate | 2021 |
| Abbasyds & Co Ltd | Wholesale & retail | 2021 |
| Abbey Distribution Limited | Manufacturing | 1998 |
| Abbey Meridian Limited | Transport & logistics | 2003 |
| ABC Components Limited | Manufacturing | 2006 |
| ABC Movers and Storers Ltd | Transport & logistics | 2014 |
| ABC Properties (HW) Ltd | Real estate | 2026 |
| ABC Street Commercial Limited | Real estate | 2021 |
| ABC Street Ltd | Real estate | 2017 |
| Abce Films Ltd | Information & communication | 2025 |
| Abdul Aziz Investments Ltd | Real estate | 2018 |
| Abel Automotive Limited | Extraterritorial | 2018 |
| Abercromby Services Ltd | Wholesale & retail | 2026 |
| Abid Catering Services Limited | Hospitality | 2012 |
| Abida Umarji Ltd | Professional & scientific | 2019 |
| Ability Tree Services Ltd | Administrative & support | 2026 |
| Abisha and Harini Limited | Wholesale & retail | 2013 |
| Abisha Services Ltd | Wholesale & retail | 2025 |
| ABM Company Secretarial Services Limited | Professional & scientific | 2015 |
| ABM Electrical Contracting Limited | Construction | 2002 |
| Above Par's Heating and Plumbing Ltd | Construction | 2022 |
| Abqad Limited | Hospitality | 2025 |