| AKJ Consulting Limited | Professional & scientific | 2019 |
| Akko Limited | Health & social care | 2022 |
| Akkus Ltd | Hospitality | 2023 |
| AKM Media Ltd | Information & communication | 2017 |
| AKS Technologies Limited | Real estate | 2011 |
| Akshaan Property Investors Ltd | Real estate | 2022 |
| Akshan Yoga Ltd | Real estate | 2026 |
| Akshana Property Investment Ltd | Real estate | 2025 |
| Akyede UK Ltd | Wholesale & retail | 2019 |
| AL Hamd Halal Meat (Wallington) Limited | Wholesale & retail | 2023 |
| Alashiya Property Limited | Real estate | 2026 |
| ALB Advisory and Consulting Ltd | Professional & scientific | 2026 |
| Albert Dock London Limited | Households | 2000 |
| Alemol and Associates Limited | Information & communication | 2021 |
| Alexana Investments Ltd | Financial services | 2025 |
| Alexander Greene Limited | Professional & scientific | 2018 |
| Alexandra Developments Limited | Construction | 2017 |
| Alfresco Comforts (Furniture) Ltd | Wholesale & retail | 2021 |
| Alifin Ltd | Health & social care | 2011 |
| Alison Unsted Associates Limited | Professional & scientific | 2018 |
| Alistair Brammer Ltd | Arts & recreation | 2025 |
| Aljtm Ltd | Construction | 2024 |
| Alken House Management Limited | Households | 1980 |
| Alkh Property Holdings Ltd | Real estate | 2023 |
| ALL About Boilers Ltd | Construction | 2024 |
| ALL Aspects Paving Ltd | Construction | 2019 |
| ALL Build London and Surrey Ltd | Construction | 2023 |
| ALL Emergency Services Limited | Wholesale & retail | 2007 |
| ALL Heads Recognised CIC | Education | 2023 |
| ALL Heads Recognized Limited | Education | 2015 |
| ALL Surrey Electrical Ltd | Administrative & support | 2017 |
| Allen & Company Limited | Hospitality | 2022 |
| Allfixroofingandguttering Ltd | Construction | 2026 |
| Allied Powers Limited | Professional & scientific | 1993 |
| ALM Mortgages Limited | Financial services | 2018 |
| Almt Services Ltd | Transport & logistics | 2018 |
| Alpha Business Connect Ltd | Other services | 2015 |
| Alpha Investco Limited | Real estate | 2026 |
| Alpha Probe Limited | Administrative & support | 2005 |
| Alpha Toro Holdings Limited | Manufacturing | 2012 |
| Alsatia Ltd | Administrative & support | 2012 |
| Altech Management Limited | Professional & scientific | 2017 |
| Altripp Design Management Limited | Arts & recreation | 2012 |
| Alvarado Interiors Limited | Construction | 2011 |
| Always on Key Music Group Ltd | Information & communication | 2019 |
| AM Cafe & Bakes Limited | Hospitality | 2020 |
| AM Procurement Services Limited | Wholesale & retail | 2025 |
| AM Strategic Consultancy Limited | Professional & scientific | 2021 |
| AMA Cladding Limited | Construction | 2022 |
| Amadeo Consulting Services Ltd | Extraterritorial | 2017 |
| Amadhya Limited | Hospitality | 2025 |
| Ambit Youth Ltd | Education | 2020 |
| Ambz Limited | Real estate | 2024 |
| AME & OLI Properties Ltd | Real estate | 2025 |
| AMK Property Solutions Ltd | Construction | 2019 |
| Amoramas Interiors Limited | Professional & scientific | 2015 |
| AMV Decor Ltd | Construction | 2025 |
| AMY Hubbard Casting Limited | Arts & recreation | 2014 |
| Anarell Limited | Wholesale & retail | 2006 |
| ANB Retail Ltd | Wholesale & retail | 2026 |
| Anderson Transport Ltd | Transport & logistics | 2018 |
| Anduma Consult Limited | Information & communication | 2019 |
| Anfus Building Services Limited | Construction | 2013 |
| Angel Business Limited | Information & communication | 2019 |
| Angel Electrical Ltd | Construction | 2017 |
| Anika Freight Forward Ltd | Wholesale & retail | 2018 |
| Anis Solutions Limited | Information & communication | 2014 |
| Anjum Trading Limited | Manufacturing | 2015 |
| Anna Rudyk Consulting Ltd | Information & communication | 2025 |
| Anon Group of Businesses Ltd | Hospitality | 2025 |
| Anova-Uk Limited | Construction | 2025 |
| Anraish Ltd | Health & social care | 2018 |
| ANS & Co. Accountants Ltd | Professional & scientific | 2025 |
| Ansam PS Ltd | Professional & scientific | 2025 |
| Ant's Toys Ltd | Wholesale & retail | 2026 |
| Anteus Solutions Limited | Information & communication | 2021 |
| Antex Limited | Real estate | 2020 |
| Anthony Perrin Management Limited | Professional & scientific | 2012 |
| Antler Estates Limited | Real estate | 2000 |
| Antler Land Limited | Real estate | 2019 |
| Antski Property Ltd | Other services | 2018 |
| AOAE1907 Ltd | Wholesale & retail | 2026 |
| AP Dhillon Holdings Ltd | Financial services | 2020 |
| APA Private Holdings Ltd | Real estate | 2026 |
| APD Services Ltd | Professional & scientific | 2023 |
| Apex Five Capital Ltd | Information & communication | 2025 |
| Apex Lifting Solutions Limited | Construction | 2025 |
| Apex Services Provider Limited | Administrative & support | 2020 |
| Apexx Property Developments Ltd | Construction | 2026 |
| Aplus Accountancy and Financial Solutions Ltd | Professional & scientific | 2025 |
| Apob Limited | Wholesale & retail | 2022 |
| Appearances by ANN Ltd. | Administrative & support | 2025 |
| April Trading UK Limited | Wholesale & retail | 2018 |
| Aqais Limited | Transport & logistics | 2015 |
| Aqua Global Solutions Holdings Limited | Financial services | 2026 |
| Aqua Global Solutions Limited | Information & communication | 1997 |
| Aquamark Cleaning Limited | Administrative & support | 2013 |
| AR 2024 Ltd | Hospitality | 2024 |
| Aram Property Investment Limited | Real estate | 2023 |
| Arana Security Ltd | Information & communication | 2013 |